CN-122025842-A - Structural battery for vehicle

Abstract

The present disclosure provides a structural battery for an electric vehicle, wherein a plurality of cathode layers, a plurality of electrolyte layers, and a plurality of anode layers are sequentially laminated from top to bottom, wherein the cathode layers include a cathode, the anode layers include an anode, electrode slurry layers are applied on both surfaces of a carbon fiber current collecting layer in the cathode and the anode, and the carbon fiber current collecting layer is formed by impregnating an electrode slurry formed of the electrode slurry layers into an inner porous layer.

Inventors

• Song Yuanji

Assignees

• 现代自动车株式会社
• 起亚株式会社

Dates

Publication Date

20260512

Application Date

20251107

Priority Date

20241111

Claims (20)

1. 1. A structural battery for an electric vehicle, comprising: a plurality of cathode layers; A plurality of electrolyte layers, and A plurality of anode layers are provided on the anode layer, Wherein: The plurality of cathode layers, the plurality of electrolyte layers, and the plurality of anode layers are laminated in order from top to bottom, The cathode layer of the plurality of cathode layers includes a cathode, and the anode layer of the plurality of anode layers includes an anode, in which an electrode slurry layer is applied on both surfaces of a carbon fiber current collecting layer, and The carbon fiber current collecting layer is formed by impregnating an electrode paste from the electrode paste layer into an inner porous layer.
2. 2. The structural battery of claim 1, wherein: The carbon fiber current collecting layer is formed to have a region extending more outwardly than the electrode slurry layer.
3. 3. The structural battery of claim 2, wherein: The electrolyte layer of the plurality of electrolyte layers includes a solid electrolyte coated on upper and lower surfaces of the electrode slurry layer.
4. 4. The structural battery of claim 3, wherein: The electrolyte layer is formed to extend to the region of the carbon fiber current collecting layer extending more outwardly than the electrode slurry layer and coats the region.
5. 5. The structural battery of claim 4, wherein: The electrolyte layer is formed to extend to and coat a first side surface of the electrode slurry layer, and to extend to and coat a second side surface of the carbon fiber current collecting layer that is on the same vertical line as the first side surface of the electrode slurry layer.
6. 6. The structural battery of claim 1, wherein: the edge portions of the plurality of cathode layers and the plurality of anode layers are impregnated with resin and sealed.
7. 7. The structural battery of claim 6, wherein: a fiberglass insulation layer is disposed at edges of the cathode layers of the plurality of cathode layers and the anode layers of the plurality of anode layers, the fiberglass insulation layer having regions extending more outwardly than the carbon fiber current collecting layer.
8. 8. The structural battery of claim 7, wherein: An inner portion of the glass fiber insulation layer in the horizontal direction is attached to an edge portion of the carbon fiber current collecting layer by a resin material.
9. 9. The structural battery of claim 8, wherein: An assembly gap is formed between the glass fiber insulating layer and the electrode slurry layer.
10. 10. The structural battery of claim 1, wherein: Forming the cathode by applying a cathode slurry layer to both surfaces of the carbon fiber current collecting layer, and The anode is formed by applying an anode slurry layer to both surfaces of the carbon fiber current collecting layer.
11. 11. The structural battery of claim 10, wherein: the cathode slurry layer includes a cathode active material, a first binder and a first conductive agent, and The anode slurry layer includes an anode active material, a second binder, and a second conductive agent.
12. 12. The structural battery of claim 1, wherein: on an outer portion of each of the upper and lower cathode layers outermost in the vertical direction, a carbon fiber structure reinforcing layer is laminated.
13. 13. The structural battery of claim 12, wherein: a soft envelope is laminated between the outermost upper and lower cathode layers and the carbon fiber structure reinforcing layer.
14. 14. The structural battery of claim 12, wherein: A glass fiber structure reinforcing layer is laminated between an outer portion of each of the outermost upper and lower cathode layers and the carbon fiber structure reinforcing layer.
15. 15. A structural battery for an electric vehicle, comprising: a cathode layer, the cathode layer comprising: a first carbon fiber current collecting layer comprising a first top surface and a first bottom surface, and A first electrode slurry layer applied to the first top surface and the first bottom surface, Wherein the first carbon fiber current collecting layer is formed by impregnating a first electrode slurry from the first electrode slurry layer into a first inner porous layer of the first carbon fiber current collecting layer; electrolyte layer, and An anode layer, the anode layer comprising: A second carbon fiber current collecting layer comprising a second top surface and a second bottom surface, and A second electrode slurry layer applied to the second top surface and the second bottom surface, Wherein the second carbon fiber current collecting layer is formed by impregnating a second electrode slurry from the second electrode slurry layer into a second inner porous layer of the second carbon fiber current collecting layer, Wherein: the cathode layer, the electrolyte layer, and the anode layer are laminated in this order from the top to the bottom of the structural battery.
16. 16. The structural battery of claim 15, wherein: The first carbon fiber current collecting layer is formed to have a first region extending more outwardly than the first electrode slurry layer, and The second carbon fiber current collecting layer is formed to have a second region extending more outwardly than the second electrode slurry layer.
17. 17. The structural battery of claim 15, wherein the electrolyte layer comprises a solid electrolyte.
18. 18. The structural battery of claim 15, wherein: The first edge portion of the cathode layer and the second edge portion of the anode layer are impregnated with resin and sealed.
19. 19. The structural battery of claim 15, wherein: the first electrode paste layer includes: A cathode active material; A first adhesive, and A first conductive agent, and The second electrode paste layer includes: An anode active material; a second binder, and And a second conductive agent.
20. 20. The structural battery of claim 15, wherein: A first fiberglass insulation layer is disposed at a first edge of the cathode layer, the first fiberglass insulation layer having a first region extending more outwardly than the first carbon fiber current collecting layer, and A second fiberglass insulation layer is disposed at a second edge of the anode layer, the second fiberglass insulation layer having a second region extending more outwardly than the second carbon fiber current collecting layer.

Description

Structural battery for vehicle Cross Reference of Related Applications The present application claims priority and rights of korean patent application No. 10-2024-0158993, filed 11/2024, to the korean intellectual property agency, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure relates to a structural battery for a vehicle, and more particularly, to a structural battery for an electric vehicle, which may be used as a member of a vehicle body to mechanically connect components while being electrochemically connected with a lithium ion battery to raise a voltage. Background In general, lithium ion batteries mounted on electric vehicles occupy a large part of the weight of the electric vehicle, but do not perform any load bearing function at all. In contrast, as shown in fig. 1, the structural battery 500 is a component installed in a frame or structure 800 constituting the electric vehicle 1000 while performing self-supporting and charge/discharge and pressurization functions of the high-voltage battery 600 installed in the vehicle body floor 700. In other words, the structural battery 500 may also be used as a battery while performing the structural functions of the electric vehicle. Such a battery is also referred to as a mass-free energy storage device because the weight of the battery storing energy is not actually present when the weight of the battery becomes part of the load-bearing structure. These composite function batteries can significantly reduce the weight of the vehicle. When the structural battery is applied to an electric vehicle, the weight is reduced and the driving range can be improved. In addition, the structural battery has a capacity of about 20% of that of the lithium ion battery, which is lower than that of the lithium ion battery, but the weight is significantly reduced because there is no separate battery, and thus, the energy required to drive the electric vehicle is reduced. In addition, the structural battery has lower electrical energy density and higher stability. As shown in fig. 2 and 3, this structural battery includes a laminate structure of a cathode layer 510 and an anode layer 520. The cathode layer includes a cathode, the anode layer includes an anode, each of the cathode and anode has electrode slurry layers 512 and 522 applied to both surfaces of the carbon fiber current collecting layer 530, and glass fiber insulation layers 542 and 544 are provided on the outside of the carbon fiber current collecting layer 530. An assembly gap G is formed between the electrode slurry layers 512 and 522 and the fiberglass insulation layers 542 and 544 to avoid interference. The edge portion of the carbon fiber current collecting layer 530 is attached to the glass fiber insulating layers 542, 544, and 546 by the resin material 535. At this time, the glass fiber insulation layers 542, 544 and 546 form layers having the same height as the cathode slurry layer 512 applied to the upper surface of the carbon fiber current collecting layer 530 of the cathode layer 510 and the anode slurry layer 522 applied to the upper surface of the carbon fiber current collecting layer 530 of the anode layer 520, respectively. Accordingly, the assembly gap G provides a gap between the glass fiber insulation layer 542 and the corresponding cathode slurry layer 512 at the position where the resin material 535 is located and between the glass fiber insulation layer 544 and the corresponding anode slurry layer 522 at the position where the resin material 535 is located, so that the slurry layers of the cathode layer 510 and the anode layer 520 can be prevented from being contaminated. However, when the assembly gap G is formed, there is a possibility of short circuit between the carbon fiber current collecting layers during the manufacturing process of the structural battery due to the fine fiber (FINE STRAND) structure of the carbon fiber current collecting layer 530 and the height tolerance of the upper and lower carbon fiber current collecting layers 530. Disclosure of Invention The present disclosure is intended to provide a structural battery for an electric vehicle in which an electrode paste is impregnated into the inside of a carbon fiber current collecting layer in the structural battery having a series connection structure to increase energy density, and an electrolyte layer coating layer extends to an outer region of the carbon fiber current collecting layer to prevent interference between the carbon fiber current collecting layers. According to an exemplary embodiment, there is provided a structural battery for an electric vehicle, wherein a plurality of cathode layers, a plurality of electrolyte layers, and a plurality of anode layers are laminated in this order from top to bottom, wherein the cathode layers include a cathode, the anode layers include an anode, electrode slurry layers are applied onto both surfaces of a carbon fiber curr