Battery pack liquid cooling device

Abstract

The present invention relates to a battery pack liquid cooling device, comprising an upper inverted trapezoidal liquid cooling device and a lower trapezoidal liquid cooling device. The upper and lower trapezoidal liquid cooling devices are arranged in a complementary manner. Single lithium batteries are placed between the upper and lower trapezoidal liquid cooling devices in a ladder-like arrangement, with their upper ends contacting the upper and lower trapezoidal liquid cooling devices and their lower ends contacting the lower trapezoidal liquid cooling devices, forming a height difference between the single lithium batteries. The upper inverted trapezoidal liquid cooling plate is connected to the corresponding lower trapezoidal liquid cooling plate at the stepped end via a connecting pipe, and the connecting pipe separates adjacent single lithium batteries. The battery pack liquid cooling device provided by the present invention has the advantages of circulating cooling, small space occupation, better cooling effect of single batteries, and safety.

Description

Technical Field

[0001] The invention relates to a battery pack liquid cooling device. Background Art

[0002] Lithium battery packs are widely used as power batteries for new energy vehicles. Currently, most spontaneous combustion incidents in new energy vehicles are caused by thermal runaway of the lithium batteries. This initially occurs in a single lithium battery due to a temperature rise that is not promptly dissipated, spreading to other cells and ultimately causing thermal runaway of the entire battery pack, leading to spontaneous combustion of the new energy vehicle and causing significant loss of life and property. To reduce the risk of spontaneous combustion in new energy vehicles, timely heat dissipation of the lithium battery pack is necessary.

[0003] In existing technologies, heat dissipation for lithium battery packs is mostly achieved through insulation or liquid cooling. When the temperature of a single lithium battery cell rises, adding a heat shield does pose a risk of temporary thermal runaway and further spread. However, because the heat is not dissipated in time, it will spread within the current module, further increasing the heat and eventually spreading to other modules, ultimately causing the entire lithium battery pack to heat up and experience thermal runaway. Liquid cooling is based on the existing lithium battery pack, with liquid cooling plates installed above or below it. Liquid cooling pipes of different shapes are arranged within the plates. The flow of coolant can cool the lithium battery to a certain extent. However, the liquid cooling plates occupy a certain amount of space, and the placement of liquid cooling plates is limited, resulting in uneven cooling of the lithium battery pack. Heat can also spread between single lithium batteries, increasing the risk of spontaneous combustion in new energy vehicles. Therefore, it is necessary to design a lithium battery pack liquid cooling device that can lay out liquid cooling plates in a limited space and circulate the coolant. Summary of the Invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a battery pack liquid cooling device, which has the advantages of circulating cooling, small space occupation, better cooling effect of single batteries, and safety.

[0005] The technical solution of the present invention to solve the above problems is: a battery pack liquid cooling device, which is special in that it includes an upper inverted trapezoidal liquid cooling device and a lower trapezoidal liquid cooling device.

[0006] The upward inverted trapezoidal liquid cooling device includes several layers of upward inverted trapezoidal liquid cooling plates, and several upper condensing plates are arranged in the upward inverted trapezoidal liquid cooling plates; the widths of the several layers of upward inverted trapezoidal liquid cooling plates are the same, and one end of them is aligned in the length direction, and this end is the alignment end, and the other end gradually shortens from top to bottom, and this end is the step end; adjacent upward inverted trapezoidal liquid cooling plates are connected at the alignment ends through upper conducting pipes, and the uppermost layer of upward inverted trapezoidal liquid cooling plates is provided with a coolant inlet at the stepped end.

[0007] The lower trapezoidal liquid cooling device includes several layers of lower trapezoidal liquid cooling plates, and several lower condensing plates are arranged in the lower trapezoidal liquid cooling plates. The widths of the several layers of lower trapezoidal liquid cooling plates are the same. In the length direction, one end of them is aligned, and this end is the alignment end. The other end gradually extends from top to bottom, and this end is the step end. Adjacent lower trapezoidal liquid cooling plates are connected at the alignment ends through lower conducting pipes, and the bottom layer of the lower trapezoidal liquid cooling plate is provided with a coolant outlet at the stepped end.

[0008] The upper and lower trapezoidal liquid cooling units are arranged in a complementary arrangement. The individual lithium-ion batteries are placed between them in a ladder-like arrangement, with their upper ends in contact with the upper trapezoidal liquid cooling unit and their lower ends in contact with the lower trapezoidal liquid cooling unit, creating a height difference between the individual lithium-ion batteries. The upper trapezoidal liquid cooling plate is connected to the corresponding lower trapezoidal liquid cooling plate at the stepped end via connecting pipes, which separate adjacent individual lithium-ion batteries.

[0009] Preferably, an upper conducting port is provided below the stepped end of the upper inverted trapezoidal liquid cooling plate, and the upper end of the connecting pipe is connected to the upper conducting port; a lower conducting port is provided above the stepped end of the lower trapezoidal liquid cooling plate, and the lower end of the connecting pipe is connected to the lower conducting port.

[0010] Preferably, the upper condensing plates in each layer of the upper inverted trapezoidal liquid cooling plate have the same specifications and are arranged in parallel, but the specifications vary from layer to layer.

[0011] Preferably, the several lower condensing plates in the lower trapezoidal liquid cooling plate have the same specifications and are arranged in parallel, but the specifications of each layer are different.

[0012] Preferably, the coolant enters from the coolant inlet of the uppermost inverted trapezoidal liquid cooling plate, flows into the lower inverted trapezoidal liquid cooling plate through the upper conducting pipe and flows toward the stepped end. During the flow, the upper end of the single lithium battery is cooled.

[0013] Preferably, the coolant flows from the stepped end of the upper inverted trapezoidal liquid cooling plate through the connecting pipe into the stepped end of the corresponding lower trapezoidal liquid cooling plate, and the coolant of each layer of the upper inverted trapezoidal liquid cooling plate will only flow into the corresponding lower trapezoidal liquid cooling plate.

[0014] Preferably, the coolant in the lower trapezoidal liquid cooling plate at the bottom layer flows out from the coolant outlet.

[0015] Advantages of the present invention:

[0016] The present invention designs a double-trapezoidal liquid cooling device for a staggered lithium battery pack. The unit lithium batteries can be cooled at multiple locations. At the same time, the coolant circulates through the liquid cooling plate in a limited space. Under the action of the condensing plate, the coolant can always be kept at a suitable operating temperature. The design of the double-trapezoidal liquid cooling plate prevents coolant leakage from affecting the normal operation of the lithium battery, and the unit lithium batteries can be freely replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view of the three-dimensional structure of the battery pack liquid cooling device of the present invention.

[0018] Figure 2 It is a perspective view of the battery pack liquid cooling device of the present invention.

[0019] Figure 3 for Figure 2 Another direction view.

[0020] Figure 4 This is a cross-sectional view of the battery pack liquid cooling device of the present invention.

[0021] Figure 5 It is a side view of the battery pack liquid cooling device of the present invention.

[0022] Figure 6 This is a top view of the battery pack liquid cooling device of the present invention.

[0023] Figure 7 It is a left view of the liquid cooling pipe connection of the present invention.

[0024] Figure 8 This is a bottom view of the lower trapezoidal liquid cooling device of the present invention.

[0025] Wherein: 1. Single lithium battery, 2. Upper inverted trapezoidal liquid cooling device, 3. Lower trapezoidal liquid cooling device, 4. Coolant inlet, 5. Coolant outlet, 6. Upper conducting pipe, 7. Lower conducting pipe, 8. Upper condensing plate, 9. Lower condensing plate, 10. Upper inverted trapezoidal liquid cooling plate, 11. Lower trapezoidal liquid cooling plate, 12. Connecting pipe, 13. Upper conducting port, 14. Lower conducting port. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is claimed, but merely represents selected embodiments of the present invention.

[0027] See also Figure 1 and Figure 2The present invention provides a battery pack liquid cooling device, comprising a connecting pipe 12, an upper inverted trapezoidal liquid cooling device 2, and a lower trapezoidal liquid cooling device 3. The upper inverted trapezoidal liquid cooling device 2 comprises several layers of upper inverted trapezoidal liquid cooling plates 10, each of which is provided with a plurality of upper condenser plates 8. The layers of upper inverted trapezoidal liquid cooling plates 10 have one end aligned, known as the aligned end, and the other end gradually shortens from top to bottom, known as the stepped end. Adjacent upper inverted trapezoidal liquid cooling plates 10 are connected at the aligned ends via upper conducting pipes 6. The topmost layer of upper inverted trapezoidal liquid cooling plates 10 is provided with a coolant inlet 4 at the stepped end.

[0028] The lower trapezoidal liquid cooling device 3 comprises several layers of lower trapezoidal liquid cooling plates 11, each of which is equipped with several lower condensing plates 9. The layers of lower trapezoidal liquid cooling plates 11 are aligned at one end, forming the aligned end, and their other ends gradually extend from top to bottom, forming the stepped end. Adjacent lower trapezoidal liquid cooling plates 11 are connected at the aligned ends via lower conducting pipes 7, and the lowest lower trapezoidal liquid cooling plate 11 has a coolant outlet 5 at the stepped end. The upper inverted trapezoidal liquid cooling device 2 and the lower trapezoidal liquid cooling device 3 are arranged in a complementary manner, with the single lithium battery cells 1 positioned between them in a ladder-like arrangement. The upper inverted trapezoidal liquid cooling plates 10 are connected to the corresponding lower trapezoidal liquid cooling plates 11 at the stepped end via connecting pipes 12, which separate the adjacent single lithium battery cells 1.

[0029] Specifically, see Figure 1 The single lithium battery cells 1 are arranged in sequence from the highest side to the lowest side, in a staggered arrangement, forming a ladder shape. Figure 2The upper inverted trapezoidal liquid cooling device 2 includes a coolant inlet 4, an upper inverted trapezoidal liquid cooling plate 10, an upper conducting pipe 6 and an upper condensing plate 8. The upper inverted trapezoidal liquid cooling plate 10 is designed according to the height of the single lithium battery 1. The single lithium battery 1 on the highest side is placed under the uppermost upper inverted trapezoidal liquid cooling plate 10 and is in direct contact with it. The single lithium battery 1 on the lowest side is placed under the lowermost upper inverted trapezoidal liquid cooling plate 10 and is in direct contact with it. The upper liquid cooling plate will form an inverted trapezoid. Each layer of liquid cooling plate includes an upper conducting pipe 6 and an upper condensing plate 8. The three coolant inlets 4 are arranged at the left end of the liquid cooling plate of the uppermost layer; the lower trapezoidal liquid cooling device 3 includes a coolant outlet 5, a lower Trapezoidal liquid cooling plate 11, lower conducting pipe 7 and lower condensing plate 9, the lower trapezoidal liquid cooling plate 11 is designed according to the height of the single lithium battery, the single lithium battery 1 on the highest side is placed on the top of the trapezoidal liquid cooling plate 11, in direct contact with it, and the single lithium battery 1 on the lowest side is placed on the bottom of the lower trapezoidal liquid cooling plate 11, in direct contact with it, and the lower liquid cooling plate will form a trapezoid. Each layer of liquid cooling plate includes a lower conducting pipe 7 and a lower condensing plate 9, and three coolant outlets 5 are arranged on the right side of the liquid cooling plate of the lowest layer; the connecting pipe 12 is close to both sides of the single lithium battery, separating them, and connecting the upper inverted trapezoidal liquid cooling device 2 with the lower trapezoidal liquid cooling device 3.

[0030] As attached Figure 3 and 4 As shown, in the liquid cooling device, the coolant flows from the coolant inlet 4 to the coolant outlet 5, passes through the upper inverted trapezoidal liquid cooling device 2, the connecting pipe 12 and the lower trapezoidal liquid cooling device 3, to form several loops. Each layer of the upper inverted trapezoidal liquid cooling plate 10 of the upper inverted trapezoidal liquid cooling device 2 is equipped with several parallel and uniformly sized upper condensing plates 8, which are used for further cooling during the flow of the coolant and also play a certain retarding effect. Several upper conducting pipes 6 are designed on the rightmost side of each adjacent two layers of the upper inverted trapezoidal liquid cooling plate 10, and the upper conducting pipes 6 of each layer are not connected to each other to avoid leakage of the coolant. The coolant inlet 4 is on the leftmost side of the upper inverted trapezoidal liquid cooling plate 10 of the uppermost layer. Except for the upper inverted trapezoidal liquid cooling plate 10 of the uppermost layer, an upper conducting port 13 is designed on the leftmost side of the upper inverted trapezoidal liquid cooling plate 10 of each layer.

[0031] Each layer of the lower trapezoidal liquid cooling plate 11 of the lower trapezoidal liquid cooling device 3 is equipped with several parallel and uniformly sized lower condensing plates 9, which are used for further cooling during the flow of the coolant and also play a certain retarding effect. Several lower conducting pipes 7 are designed on the leftmost side of each two adjacent layers of the lower trapezoidal liquid cooling plate 11, and the lower conducting pipes 7 of each layer are not connected to each other to avoid leakage of the coolant. The coolant outlet 5 is on the rightmost side of the lower trapezoidal liquid cooling plate 11 of the bottom layer. Except for the lower trapezoidal liquid cooling plate 11 of the bottom layer, a lower conducting port 14 is designed on the rightmost side of the lower trapezoidal liquid cooling plate 11 of each layer. The upper end of the connecting pipe 12 is connected to the upper conducting port 13 on the leftmost side of the upper inverted trapezoidal liquid cooling plate 10, and the lower end is connected to the lower conducting port 14 on the rightmost side of the lower trapezoidal liquid cooling plate 11.

[0032] As attached Figure 5 and 7 As shown, the upper right end of the single lithium battery 1 contacts the upper conducting port 13 at the left end of the upper inverted trapezoidal liquid cooling plate 10 , the upper end of the connecting pipe 12 is connected to the upper conducting port 13 , and the lower end thereof is connected to the lower conducting port 14 .

[0033] As attached Figure 6 and 8 As shown, there are several condensing plates in each layer of the upper inverted trapezoidal liquid cooling plate 10 and the lower trapezoidal liquid cooling plate. The condensing plates in each layer have the same specifications and are parallel, but the specifications of the condensing plates between layers are different and are designed according to the size of the liquid cooling plates in each layer.

[0034] In order to facilitate understanding of the technical solution of the present invention, the working principle of the present invention in actual process is described in detail below.

[0035] The working principle of the present invention is to install the device at a suitable position at the bottom of the new energy vehicle. When the new energy vehicle is started, the coolant flows in from the coolant inlet 4 on the left side of the upper inverted trapezoidal liquid cooling device 2, first passes through the upper inverted trapezoidal liquid cooling plate 10 of the first layer, and contacts the upper condensation plate 8 during the flow, so that the coolant is cooled. During the flow, the upper end of the single lithium battery 1 can be cooled, and the upper conductive pipe 6 of the first layer is passed through and flows into the second layer of the upper inverted trapezoidal liquid cooling plate 10, where the upper condensation plate 8 is arranged, to further cool the coolant. The coolant enters the connecting pipe 12 through the upper conductive port 13 on the far left and flows into the first layer of the lower trapezoidal liquid cooling plate 11 of the lower trapezoidal liquid cooling device 3. During the flow, the side of the single lithium battery 1 can be cooled, where the lower condensation plate 9 is arranged, and the coolant is cooled again, which can cool the lower end of the single lithium battery 1 and flows into the second layer of the lower trapezoidal liquid cooling plate 11 through the lower conductive pipe 7 of the first layer.

[0036] See also Figure 4An upper conducting pipe 6 is provided on the rightmost side of the upper inverted trapezoidal liquid cooling plate 10 of each layer, and the coolant can flow into the corresponding layer below, and then flow into the connecting pipe through the upper conducting port 13 on the leftmost side, and flow into the lower trapezoidal liquid cooling plate 11 through the lower conducting port 14, and flow into the lower trapezoidal liquid cooling plate 11 of the corresponding next layer through the lower conducting pipe 7 on the leftmost side, and finally flow out from the coolant outlet 5. During the circulation of the coolant, the upper end, lower end and side surfaces of the single lithium battery 1 are cooled, and the coolant is also cooled to varying degrees while flowing.

[0037] Finally, it should be noted that the above is only the best embodiment of the present invention, but the scope of protection of the present invention is not limited to this. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack liquid cooling device, characterized in that: It comprises an upper inverted trapezoidal liquid cooling device (2) and a lower trapezoidal liquid cooling device (3); The upper inverted trapezoidal liquid cooling device (2) comprises a plurality of layers of upper inverted trapezoidal liquid cooling plates (10), wherein a plurality of upper condensing plates (8) are arranged inside the upper inverted trapezoidal liquid cooling plates (10); one end of the plurality of layers of upper inverted trapezoidal liquid cooling plates (10) is aligned, and the end is the alignment end, and the other end is gradually shortened from top to bottom, and the end is the step end; adjacent upper inverted trapezoidal liquid cooling plates (10) are connected at the alignment end through an upper conducting pipe (6). The uppermost inverted trapezoidal liquid cooling plate (10) is provided with a cooling liquid inlet (4) at the stepped end; The lower trapezoidal liquid cooling device (3) comprises a plurality of layers of lower trapezoidal liquid cooling plates (11), wherein a plurality of lower condensing plates (9) are provided in the lower trapezoidal liquid cooling plates (11), one end of the plurality of layers of lower trapezoidal liquid cooling plates (11) is aligned, and the end is the alignment end, and the other end is gradually extended from top to bottom, and the end is the step end, and adjacent lower trapezoidal liquid cooling plates (11) are connected at the alignment end through the lower conducting pipe (7). The bottom trapezoidal liquid cooling plate (11) is provided with a cooling liquid outlet (5) at the stepped end; The upper inverted trapezoidal liquid cooling device (2) and the lower trapezoidal liquid cooling device (3) are arranged in a complementary manner up and down, and the single lithium battery (1) is placed between the upper inverted trapezoidal liquid cooling device (2) and the lower trapezoidal liquid cooling device (3) in a ladder-like arrangement; The upper inverted trapezoidal liquid cooling plate (10) is connected to the corresponding lower trapezoidal liquid cooling plate (11) at the step end via a connecting pipe (12), and the connecting pipe (12) separates adjacent single lithium batteries (1).

2. The battery pack liquid cooling device according to claim 1, characterized in that: An upper conducting port (13) is provided below the stepped end of the upper inverted trapezoidal liquid cooling plate (10), and the upper end of the connecting pipe (12) is connected to the upper conducting port (13); A lower conducting port (14) is provided above the stepped end of the lower trapezoidal liquid cooling plate (11), and the lower end of the connecting pipe (12) is connected to the lower conducting port (14).

3. The battery pack liquid cooling device according to claim 2, characterized in that: The plurality of upper condensing plates (8) in the upper inverted trapezoidal liquid cooling plate (10) are of the same size and are arranged in parallel.

4. The battery pack liquid cooling device according to claim 3, characterized in that: The plurality of lower condensing plates (9) in the lower trapezoidal liquid cooling plate (11) are of the same size and are arranged in parallel.

5. The battery pack liquid cooling device according to claim 4, characterized in that: The coolant enters from the coolant inlet (4) of the uppermost inverted trapezoidal liquid cooling plate (10), flows into the lower inverted trapezoidal liquid cooling plate (10) through the upper conducting pipe (6) and flows toward the stepped end. During the flow, the upper end of the single lithium battery (1) is cooled.

6. The battery pack liquid cooling device according to claim 5, characterized in that: The cooling liquid flows from the stepped end of the upper inverted trapezoidal liquid cooling plate (10) through the connecting pipe (12) into the stepped end of the corresponding lower trapezoidal liquid cooling plate (11), and the cooling liquid of each layer of the upper inverted trapezoidal liquid cooling plate (10) will only flow into the corresponding lower trapezoidal liquid cooling plate (11).

7. The battery pack liquid cooling device according to claim 6, characterized in that: The cooling liquid in the lower trapezoidal liquid cooling plate (11) at the bottom layer flows out from the cooling liquid outlet (5).

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