CN-115133170-B - Battery box body integrating liquid cooling system, power battery system and electric automobile

Abstract

The invention discloses a battery box body integrating a liquid cooling system, a power battery system and an electric automobile, and relates to the technical field of new energy electric automobiles, comprising a liquid cooling plate, wherein one end of the liquid cooling plate is connected with a front beam, the other end of the liquid cooling plate is connected with a rear beam, the liquid cooling plate is divided into a water inlet area and a water return area, and the water inlet area and the water return area form a liquid cooling loop through liquid cooling collecting bins in the front beam and the rear beam; the two sides of the liquid cooling plate are respectively provided with a side beam, the bottom plate is fixed at the bottom of the liquid cooling plate. The liquid cooling plate, the front beam and the rear beam form a liquid cooling loop, a pipeline and a joint are omitted, the risk of water leakage is reduced, the liquid cooling plate is provided with a through cooling liquid flow passage, the mold is not required to be opened again for different batteries, and the liquid cooling plate is suitable for electric automobiles with different capacities.

Inventors

• WANG YADONG
• XIE KUN
• SONG KAITONG

Assignees

• 奇瑞新能源汽车股份有限公司

Dates

Publication Date

20260505

Application Date

20220428

Claims (13)

1. 1. The battery box body of the integrated liquid cooling system is characterized by comprising a liquid cooling plate, wherein one end of the liquid cooling plate is connected with a front beam, the other end of the liquid cooling plate is connected with a rear beam, the liquid cooling plate is divided into a water inlet area and a water return area, and the water inlet area and the water return area form a liquid cooling loop through liquid cooling collecting bins in the front beam and the rear beam; The liquid cooling and collecting bin of the front beam is divided into a first part communicated with one end of a cooling liquid flow channel of the water inlet area and a second part communicated with one end of a cooling liquid flow channel of the water return area, wherein the other ends of the cooling liquid flow channels of the water inlet area and the water return area are communicated through the liquid cooling and collecting bin of the rear beam; The two sides of the liquid cooling collecting bin of the front beam and the rear beam are blocked by side sealing plates, and the liquid cooling collecting bin of the front beam is divided into a first part and a second part by an intermediate sealing plate; The longitudinal section of the liquid cooling collecting bin forms an expansion structure from one side close to the liquid cooling plate to the other side, the section size of one side, communicated with the cooling liquid flow channel, of the liquid cooling collecting bin is smaller than that of the other side, a plurality of cavities are arranged in the rear beam along the vertical direction, the bottom cavity is used as the liquid cooling collecting bin, and two ends of the liquid cooling collecting bin are plugged through side sealing plates; One side of the side beam is provided with a first convex rib fixed with the liquid cooling plate, and the other side of the side beam is provided with a second convex rib matched with the vehicle body.
2. 2. The battery box of claim 1, wherein the water inlet area and the water return area are respectively provided with a plurality of cooling liquid channels, and the cooling liquid channels extend from one end of the liquid cooling plate to the other end.
3. 3. The battery box of an integrated liquid cooling system according to claim 1 or 2, wherein the water inlet area is connected to the water inlet, and the water return area is connected to the water outlet.
4. 4. The battery box of the integrated liquid cooling system according to claim 1, wherein the front beam and the rear beam are provided with a plurality of cavities from top to bottom, and the bottom cavity is used as a liquid cooling collecting bin communicated with the cooling liquid flow channel.
5. 5. The battery box of the integrated liquid cooling system according to claim 1, wherein a liquid cooling plate butt joint is formed on one side of the liquid cooling collecting bin, which faces the liquid cooling plate.
6. 6. The integrated liquid cooling system battery box of claim 1 wherein the front and rear beam bottoms have first mounting portions that mate with a base plate.
7. 7. The battery case of claim 6, wherein the first mounting portion is of a stepped configuration.
8. 8. The integrated liquid cooling system battery box of claim 1 wherein the side rail bottom is provided with a second mounting portion for engaging the bottom plate.
9. 9. The battery case of claim 8, wherein the second mounting portion is of a stepped configuration.
10. 10. The battery box body of the integrated liquid cooling system according to claim 1, wherein concave ribs are respectively arranged at two ends of the bottom plate, and a plurality of transverse ribs and a plurality of longitudinal ribs perpendicular to the transverse ribs are arranged on the surface of the bottom plate at intervals.
11. 11. The integrated liquid cooling system battery box of claim 10 wherein the upper side of the liquid cooling plate has at least two inner beams parallel to the side beams.
12. 12. A power battery system comprising the battery housing of claim 1, wherein a power battery is disposed within the battery housing.
13. 13. An electric vehicle characterized in that the power battery system according to claim 12 is mounted.

Description

Battery box body integrating liquid cooling system, power battery system and electric automobile Technical Field The invention relates to the technical field of new energy electric automobiles, in particular to a battery box body of an integrated liquid cooling system, a power battery system and an electric automobile. Background With the popularization of electric vehicles, the requirements on various aspects of the electric vehicles are also increasing, and particularly, the cost is reduced and the safety performance is improved. The power battery system is used as a key part of the electric automobile and becomes one of main links for controlling factors such as cost. The cost, weight, etc. of the power battery liquid cooling system are relatively high in the whole power battery system. The traditional power battery liquid cooling system is relatively heavy in weight and has great influence on the energy density of the power battery, the pipeline interfaces of the power battery liquid cooling system are more, the water leakage risk of the power battery is increased, the occupied space of the power battery liquid cooling system is large, the arrangement space of the battery cells is reduced, the whole vehicle endurance mileage is indirectly reduced, and therefore the power battery liquid cooling system needs to be optimized. For example, CN113594600a discloses a light liquid cooling battery box body, which comprises a bottom plate, a front frame, a rear frame, a left frame and a right frame, wherein the front frame, the rear frame and the bottom plate are integrally formed, the left frame, the right frame and the bottom plate are connected through welding or fastening pieces, the bottom is integrated with a liquid cooling system through welding, and a heat insulation layer is added, so that the temperature uniformity in the battery pack is provided. The scheme reduces the types of parts and the welding amount by integrally forming the front frame, the rear frame and the bottom plate of the cold battery box body, and reduces the service life of the battery by welding an integrated liquid cooling system at the bottom of the bottom plate. The liquid cooling system is of a structure attached to the bottom of the bottom plate, is not combined with the battery box body, has a single function, adopts pipelines which are arranged in a serpentine manner in the liquid cooling plate, and is connected with each other through parts such as pipe joints, so that the problem of liquid leakage is easy to occur. CN106935756B discloses a cold and hot integrated box structure, the box main body includes bottom plate and curb plate, and the bottom plate encloses into the holding chamber that is used for holding the battery with the curb plate, and inside liquid cooling system and the heating system of having arranged in turn of bottom plate, liquid cooling system is serpentine to distribute in the inside coolant liquid runner of bottom plate, and heating system is including setting up the first cavity between adjacent coolant liquid runner and filling in the heating device in first cavity. In this scheme, be provided with fluid entry and the fluid outlet with the liquid cooling system intercommunication in the curb plate, a fluid entry corresponds the multichannel and is greater than the runner of this entry size, appears the unbalanced phenomenon of flow easily, influences the cooling effect. Likewise, the cooling liquid flow channels in the scheme adopt serpentine distribution, and two adjacent cooling liquid flow channels are communicated by a flow channel bridge, so that cooling liquid is reversed. Because the distribution of the cooling liquid flow channel is complex, and the reversing sections are arranged at the two ends, for batteries with different sizes, a bottom plate meeting corresponding requirements is required to be independently molded, the processing difficulty is increased, and the cost is high. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a battery box body of an integrated liquid cooling system, a power battery system and an electric automobile, wherein a liquid cooling loop is formed by a liquid cooling plate, a front beam and a rear beam, a pipeline and a joint are omitted, the risk of water leakage is reduced, and the liquid cooling plate is provided with a through cooling liquid flow passage, so that the battery box body is not required to be opened again for different batteries, and the integrated liquid cooling system is suitable for electric automobiles with different capacities. In order to achieve the above object, the present invention is realized by the following technical scheme: In a first aspect, an embodiment of the invention provides a battery box body of an integrated liquid cooling system, which comprises a liquid cooling plate, wherein one end of the liquid cooling plate is connected with a front beam, the other end of the liquid cooling p