A power battery housing with both heating and cooling functions

Abstract

This invention belongs to the field of automotive technology, specifically a power battery housing with both heating and cooling functions. It includes a lower housing and an upper cover; the lower housing and upper cover form a sealed housing; the lower housing includes a base plate and side walls; the base plate includes an upper base plate and a lower base plate; the upper and lower base plates are fixedly connected; the battery module is mounted on the upper base plate; a crossbeam is provided on the upper base plate; a first water channel is provided on the lower base plate; a second water channel is provided on the crossbeam; the first and second water channels have different inlets; the first and second water channels converge at the rear end of the outlet via a PVC pipe; both the inlets and outlets are connected to the vehicle's thermal management system. This invention combines heating and cooling functions, eliminating the need for a separate heating and cooling device inside the battery, thus solving the problem of excessively high or low temperatures in existing battery systems affecting battery life or posing safety hazards.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically a power battery box that combines heating and cooling functions. Background Technology

[0002] With the increasing severity of the global energy crisis and environmental pollution, new energy vehicles have gradually become a development strategy for countries around the world. Power batteries provide some or even all of the power for vehicles and are hailed as the "heart" of new energy vehicles. Therefore, the quality of the battery system directly determines whether the performance of a new energy vehicle meets standards. Whether the battery temperature is too low or too high, it will seriously affect its discharge efficiency and lifespan, and may even pose safety hazards. Therefore, maintaining the thermal uniformity of the battery temperature under different operating conditions is crucial for preserving battery performance. Summary of the Invention

[0003] This invention provides a power battery housing that combines heating and cooling functions, eliminating the need for separate heating and cooling devices inside the battery. This solves the problem of existing battery systems experiencing excessively high or low temperatures that affect battery life or pose safety hazards.

[0004] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0005] A power battery box with both heating and cooling functions includes a lower box 1 and an upper box cover 2; the lower box 1 and the upper box cover 2 form a sealed box; the lower box 1 includes a bottom plate 3 and side walls 4; the bottom plate 3 includes an upper bottom plate 5 and a lower bottom plate 6; the upper bottom plate 5 and the lower bottom plate 6 are fixedly connected; a battery module 8 is mounted on the upper bottom plate 5; a crossbeam 7 is provided on the upper bottom plate 5; a first water channel is provided on the lower bottom plate 6; a second water channel 41 is provided on the crossbeam 7; the first water channel and the second water channel 41 have different inlets; the first water channel and the second water channel 41 converge at the rear end of the outlet through a PVC pipe; both the inlets and outlets are connected to the vehicle thermal management system.

[0006] Furthermore, the base plate 3 is a double-layered cuboid structure made of aluminum alloy profiles.

[0007] Furthermore, a first water channel is provided on the lower base plate 6; the cross-section 40 of the first water channel is semi-circular, the channel radius is 6-9mm, and the distance between two adjacent channels is 110-130mm.

[0008] Furthermore, the thickness of the lower base plate 6 is 4-7mm; wherein, the lower base plate 6 has a PVC protective layer with a thickness of 1-2mm.

[0009] Further, the upper surface of the upper bottom plate 5 is coated with a thermal conductive adhesive with a thickness of 1 mm.

[0010] Further, the gap between the battery module 8 and the cross beam 7 is filled with a thermal conductive material.

[0011] Further, there are four cross beams 7, which are made of aluminum alloy materials by welding, the lower end is welded to the upper bottom plate 5, and the side end is welded to the side wall 4.

[0012] Further, a second waterway 41 is provided on each cross beam 7; a baffle 9 is provided at the water inlet of each cross beam 7.

[0013] Further, the radii of the baffle 9 are 2 mm, 4 mm, 6 mm, and 8 mm respectively according to the distance from the water inlet from near to far.

[0014] Further, the second waterway 41 is arranged symmetrically in a double-row "Ji" shape; the cross-sectional area of the flow channel of the second waterway 41 is semi-circular, the radius of the flow channel is 6-9 mm, and the distance between adjacent two flow channels is 12-14 mm.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1) The present invention has both heating and cooling functions, and there is no need to install separate heating and cooling devices inside the battery, which greatly simplifies the overall structure of the battery box, reduces the self-weight and cost of the battery box, and effectively improves the heat transfer efficiency inside the battery;

[0017] 2) The present invention is prepared by using aluminum alloy profiles through processes such as extrusion profiling and welding, with a light self-weight, which has an obvious effect on the lightweight of the vehicle body. Moreover, the aluminum alloy battery shell has good anti-corrosion performance and does not need surface anti-corrosion treatment, further reducing the process cost.

[0018] 3) Coating the upper surface of the upper bottom plate of the present invention with a thermal conductive adhesive can improve the heat transfer efficiency;

[0019] 4) In the present invention, the first waterway and the second waterway are controlled separately, which can effectively improve the working efficiency;

[0020] 5) The bottom surface of the lower bottom plate of the present invention is provided with a PVC protection layer, which can effectively improve the heat preservation effect of the battery box. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the first waterway in this invention;

[0024] Figure 3 This is a schematic diagram of the flow channel cross-section of the first waterway in this invention;

[0025] Figure 4 This is a schematic diagram of the flow channel arrangement of the second waterway in this invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of the baffle plate in this invention;

[0027] Figure 6 This is a schematic diagram illustrating the working principle of the heating and cooling system of the present invention.

[0028] In the picture:

[0029] 1. Lower housing; 2. Upper cover; 3. Base plate; 4. Side wall; 5. Upper base plate; 6. Lower base plate; 7. Crossbeam; 8. Battery module; 9. Baffle plate; 10. First electric water pump; 11. PTC heating film; 12. Third temperature sensor; 13. Vehicle controller; 14. Electronic three-way valve; 15. First heat exchanger; 16. Air conditioning heater core; 17. Power battery; 18. Second water pump; 19. Third water pump; 20. Fifth temperature sensor; 21. Second temperature sensor; 22. Compressor; 23. 24. First pressure sensor; 25. Fourth temperature sensor; 26. Condenser; 27. Evaporator; 28. Blower; 29. ​​Second heat exchanger; 20. Second pressure sensor; 31. Third temperature sensor; 32. DC-DC converter; 33. Power motor; 34. Electric water pump; 35. First temperature sensor; 36. Radiator; 37. Valve with shut-off function; 38. Water pipe; 39. First water inlet; 40. First water outlet; 41. Flow channel cross-section of the first water path; 42. Second water path; 43. Charger. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] See Figure 1 A power battery housing with both heating and cooling functions includes a lower housing 1 and an upper housing cover 2; the lower housing 1 and the upper housing cover 2 constitute a sealed housing.

[0035] The lower housing 1 includes a bottom plate 3 and a side wall 4; the bottom plate 3 is a double-layered rectangular structure, including an upper bottom plate 5 and a lower bottom plate 6; the upper bottom plate 5 and the lower bottom plate 6 are made of aluminum alloy profiles connected by brazing.

[0036] The base plate 3 has a total thickness of 10-12mm, of which the upper base plate 5 has a thickness of 2-3mm and the lower base plate 6 has a thickness of 4-7mm. The bottom surface of the lower base plate 6 is provided with a 1-2mm thick PVC protective layer to improve the thermal insulation effect of the structure. The upper surface of the upper base plate 5 is coated with a 1mm thick thermally conductive adhesive.

[0037] See Figure 2 and Figure 3, a first waterway is provided on the lower bottom plate 6; the upper surface of the lower bottom plate 6 serves as the bottom plate of the first waterway, and the lower surface of the upper bottom plate 5 serves as the top plate of the first waterway; the first waterway has a first water inlet 38 and a first water outlet 39; the first water inlet 38 supplies water to the water pipe 37.

[0038] The first waterway is symmetrically distributed in a double-row "ji" shape, the flow channel cross-section 40 of the first waterway is semi-circular, the flow channel radius is 6-9 mm, and the distance between adjacent two flow channels is 110-130 mm.

[0039] Refer to Figure 4 , four cross beams 7 are fixed on the upper bottom plate 5; the cross beams 7 are made by welding with aluminum alloy materials and are connected to the bottom plate 3 and the side wall 4 by welding. The battery module 8 is fixed on the cross beam 7, and the gap between the battery module 8 and the cross beam 7 is filled with a heat-conducting material; a second waterway 41 is provided between the front and rear surfaces of the cross beam 7; the second waterway 41 has a second water inlet and a second water outlet; the second water outlet is confluent with the rear end of the first water outlet 39 through a PVC pipe.

[0040] In order to achieve reasonable energy distribution, electric water pumps are separately arranged at the front ends of the first water inlet 38 and the second water inlet to control the flow rate and velocity inside the waterway. The opening and closing of the above-mentioned electric water pumps are both separately controlled by the vehicle controller. Each electric water pump can work independently, or the two water pumps can work simultaneously.

[0041] The second waterway 41 forms a flow channel by stamping; the water flow channels of the second waterway 41 are symmetrically arranged in a double-row "ji" shape. The cross-section of the water flow channel of the second waterway 41 is semi-circular, the flow channel radius is 6-9 mm, and the distance between adjacent two flow channels is 12-14 mm.

[0042] Refer to Figure 5 , one second waterway 41 is provided on each cross beam 7; a baffle 9 with different sizes is provided at the water inlets of the four cross beams 7, and the radii of the baffle 9 are 2 mm, 4 mm, 6 mm and 8 mm respectively according to the distance from the water inlet, so that the water inflow of the second waterway 41 on the cross beam 7 can be evenly distributed.

[0043] In summary, the present application has two waterways and can both heat and cool the power battery 17.

[0044] The working principle of the present invention is as follows:

[0045] Refer to Figure 6When the power battery 17 needs to be heated, the coolant is pumped into the vehicle heating circuit by the first electric water pump 10. After passing through the PTC heating film 11, the third temperature sensor 12 transmits the temperature data of the heated water back to the vehicle controller 13. Then, the coolant passes through the electronic three-way valve 14 and then through the first heat exchanger 15 and the air conditioning heater core 16. The coolant that passes through the first heat exchanger 15 then enters the power battery 17.

[0046] The second electric water pump 18 and the third electric water pump 19 pump water into the two internal water circuits of the power battery 16, respectively, and transmit the temperature data of the heated water to the vehicle controller 13 via the temperature sensor 2. The vehicle controller 13 adjusts the heating power of the PTC heating film 11 by analyzing the temperature data from the fifth temperature sensor 20 and the second temperature sensor 21. When the power battery 17 needs cooling, the coolant flows out from the second heat exchanger and evaporator and into the compressor 22. The compressor 22 draws the coolant, compresses it, and sends it to the high-pressure zone (outdoor condenser) for cooling and condensation, passing through the first pressure sensor 23 and the fourth temperature sensor 24 along the way. After heat exchange is completed in the condenser 25, it can be divided into two branches, each with a shut-off valve 36 at the end to ensure that the flow range of the coolant can be controlled. The coolant flowing through the evaporator 26 is accelerated by the blower 27 to carry away heat and then flows out. The coolant flowing through the second heat exchanger 28 provides cooling for the power battery 17. It is pumped into two water circuits inside the power battery 17 by the second electric water pump 18 and the third electric water pump 19, respectively. After flowing out, the coolant passes through the second pressure sensor 29 and the third temperature sensor 30 before returning to the compressor 22. Both the temperature and pressure sensors upload data to the vehicle controller 13, which adjusts the power of the evaporator 26 and the blower 27 based on the uploaded data to provide a more precise cooling effect.

[0047] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A power battery housing with both heating and cooling functions, characterized in that, It includes a lower box body (1) and an upper box cover (2); the lower box body (1) and the upper box cover (2) form a sealed box body; the lower box body (1) includes a bottom plate (3) and side walls (4); the bottom plate (3) includes an upper bottom plate (5) and a lower bottom plate (6); the upper bottom plate (5) and the lower bottom plate (6) are fixedly connected; a battery module (8) is arranged on the upper bottom plate (5); a cross beam (7) is arranged on the upper bottom plate (5); a first waterway is arranged on the lower bottom plate (6); a second waterway is arranged on the cross beam (7); the first waterway and the second waterway have different water inlets; the first waterway and the second waterway converge through a PVC pipe at the rear end of the water outlet; both the water inlet and the water outlet are connected to the vehicle thermal management system; The bottom plate (3) is a double-layer structure of a cuboid and is made of aluminum alloy profiles; A first waterway is arranged on the lower bottom plate (6); the cross-sectional area (40) of the flow channel of the first waterway is semi-circular, the flow channel radius is 6 - 9 mm, and the distance between adjacent two flow channels is 110 - 130 mm; The thickness of the lower bottom plate (6) is 4 - 7 mm; among them, there is a PVC protective layer with a thickness of 1 - 2 mm on the lower bottom plate (6); The upper surface of the upper bottom plate (5) is coated with a heat-conducting glue with a thickness of 1 mm; The gap between the battery module (8) and the cross beam (7) is filled with a heat-conducting material; There are four cross beams (7), which are made by welding aluminum alloy materials, the lower end is welded to the upper bottom plate (5), and the side end is welded to the side wall (4); One second waterway is arranged on each cross beam (7); a baffle plate (9) is arranged at the water inlet of each cross beam (7); The radii of the baffle plate (9) are 2 mm, 4 mm, 6 mm, and 8 mm respectively according to the distance from the water inlet from near to far; The second waterway is arranged in a double-row "zigzag" symmetric layout; the cross-sectional area of the flow channel of the second waterway is semi-circular, the flow channel radius is 6 - 9 mm, and the distance between adjacent two flow channels is 12 - 14 mm.

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