Battery pack liquid cooling device

Abstract

The invention relates to a battery pack liquid cooling device which comprises an upper inverted trapezoidal liquid cooling device and a lower trapezoidal liquid cooling device, the upper inverted trapezoidal liquid cooling device and the lower trapezoidal liquid cooling device are arranged in an up-down complementary mode, single lithium batteries are arranged between the upper inverted trapezoidal liquid cooling device and the lower trapezoidal liquid cooling device in a ladder type, and the upper ends of the single lithium batteries make contact with the upper inverted trapezoidal liquid cooling device. The lower ends of the single lithium batteries are in contact with the lower trapezoidal liquid cooling device, and height difference is formed among the single lithium batteries; the upper inverted trapezoidal liquid cooling plates are communicated with the corresponding lower trapezoidal liquid cooling plates at the step ends through connecting pipelines, and the connecting pipelines separate the adjacent single lithium batteries. The battery pack liquid cooling device provided by the invention has the advantages of circulating cooling, small occupied space, better single battery cooling effect, safety and the like.

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. At present, most of the spontaneous combustion accidents of new energy vehicles are caused by thermal runaway of lithium batteries. The first is that the temperature of the single lithium battery is not promptly dissipated due to the increase in temperature, which then spreads to other unit lithium batteries. Finally, the entire battery pack has thermal runaway, resulting in spontaneous combustion of new energy vehicles, causing great losses to human life and property. In order to reduce the risk of spontaneous combustion of new energy vehicles, it is necessary to dissipate heat from the lithium battery pack in a timely manner.

[0003] In the prior art, heat dissipation of lithium battery packs is mostly done by heat insulation or liquid cooling. When the temperature of a single lithium battery rises, there is indeed a risk of further thermal runaway by adding a heat insulation plate. However, because the heat is not dissipated in time, it will spread in the current module, and the heat will rise further, and eventually spread to other modules. Finally, the temperature of the entire lithium battery pack rises and thermal runaway occurs. Liquid cooling is based on the existing lithium battery pack, and a liquid cooling plate is installed above or below it. Liquid cooling pipes of different shapes are arranged inside the plate. The temperature of the lithium battery can be cooled to a certain extent by the flow of coolant. However, the liquid cooling plate occupies a certain space, and the laying of the liquid cooling plate is limited, so the cooling of the lithium battery pack is uneven, and heat transfer will also occur between single lithium batteries, increasing the risk of spontaneous combustion of new energy vehicles. Therefore, it is necessary to design a lithium battery pack liquid cooling device that lays a reasonable liquid cooling plate in a limited space and circulates 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 battery cells, and safety.

[0005] The technical solution of the present invention to solve the above-mentioned problem 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 comprises a plurality of layers of upward inverted trapezoidal liquid cooling plates, wherein a plurality of upper condensation plates are arranged inside the upward inverted trapezoidal liquid cooling plates; the widths of the plurality of layers of upward inverted trapezoidal liquid cooling plates are the same, and one end thereof is aligned in the length direction, and the end is the alignment end, and the other end thereof is gradually shortened from top to bottom, and the 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 step 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 thereof is aligned, and this end is the alignment end, and the other end is gradually extended 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 step end.

[0008] The upper inverted trapezoidal liquid cooling device and the lower trapezoidal liquid cooling device are arranged in a complementary manner. The single lithium battery is placed between the upper inverted trapezoidal liquid cooling device and the lower trapezoidal liquid cooling device in a ladder-like arrangement, with its upper end in contact with the upper inverted trapezoidal liquid cooling device and its lower end in contact with the lower trapezoidal liquid cooling device, and a height difference is formed between the single lithium batteries; the upper inverted trapezoidal liquid cooling plate is connected to the corresponding lower trapezoidal liquid cooling plate at the step end through a connecting pipe, and the connecting pipe separates the adjacent single lithium 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 several 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 are different between layers.

[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 into the stepped end of the corresponding lower trapezoidal liquid cooling plate through the connecting pipe, 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, in which unit lithium batteries can be cooled at multiple locations, and at the same time, the coolant circulates through the liquid cooling plate in a limited space, and under the action of the condensing plate, the coolant can always be kept at a suitable working temperature. The design of the double trapezoidal liquid cooling plate prevents the coolant leakage from affecting the normal operation of the lithium battery, and the unit lithium battery can be freely replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It 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 It 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 It is a top view of the battery pack liquid cooling device of the present invention.

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

[0024] Figure 8 It 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 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 claimed for protection, but merely represents selected embodiments of the present invention.

[0027] See also Figure 1 and Figure 2The present invention proposes a battery pack liquid cooling device, including 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 includes a plurality of layers of upper inverted trapezoidal liquid cooling plates 10, and a plurality of upper condensing plates 8 are arranged in 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. The adjacent upper inverted trapezoidal liquid cooling plates 10 are connected at the alignment end through the upper conducting pipe 6, and the upper inverted trapezoidal liquid cooling plate 10 of the uppermost layer is provided with a coolant inlet 4 at the step end.

[0028] The lower trapezoidal liquid cooling device 3 includes several layers of lower trapezoidal liquid cooling plates 11, and several lower condensing plates 9 are arranged in the lower trapezoidal liquid cooling plates 11. One end of the several layers of lower trapezoidal liquid cooling plates 11 is aligned, and the end is the alignment end, and the other end gradually extends from top to bottom, and the end is the step end. The adjacent lower trapezoidal liquid cooling plates 11 are connected at the alignment end through the lower conducting pipe 7, and the bottom lower trapezoidal liquid cooling plate 11 is provided with a coolant outlet 5 at the step end. The upper inverted trapezoidal liquid cooling device 2 and the lower trapezoidal liquid cooling device 3 are arranged in a complementary manner, 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, and is arranged in a ladder-like shape; the upper inverted trapezoidal liquid cooling plate 10 is connected to the corresponding lower trapezoidal liquid cooling plate 11 at the step end through the connecting pipe 12, and the connecting pipe 12 separates the adjacent single lithium batteries 1.

[0029] Specifically, see Figure 1 The single lithium batteries 1 are arranged in sequence from the highest side to the other lowest side, in a staggered arrangement to form a ladder shape. Figure 2The upper inverted trapezoidal liquid cooling device 2 includes a cooling liquid 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 top 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 bottom 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. Three cooling liquid inlets 4 are arranged at the left end of the liquid cooling plate of the top layer; the lower trapezoidal liquid cooling device 3 includes a cooling liquid 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 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 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 the two sides of the single lithium battery to separate them, and connects 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, 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 provided 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, the 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 plates 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 the 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 with the upper condensation plate 8 during the flow process, so that the coolant is cooled. During the flow, the upper end of the single lithium battery 1 can be cooled, and the coolant flows into the second layer of the upper inverted trapezoidal liquid cooling plate 10 through the upper conduction port 6 of the first layer, wherein the upper condensation plate 8 is arranged, and the coolant is further cooled. The coolant enters the connecting pipe 12 through the upper conduction 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 process, the side of the lithium battery single body 1 can be cooled, wherein the lower condensation plate 9 is arranged, and the coolant is cooled again, and the lower end of the single lithium battery 1 can be cooled, and the coolant flows into the second layer of the lower trapezoidal liquid cooling plate 11 through the lower conduction pipe 7 of the first layer.

[0036] See also Figure 4An upper conducting pipe 6 is arranged on the rightmost side of the upper inverted trapezoidal liquid cooling plate 10 of each layer, and the coolant can flow into the next layer of the corresponding layer, and then flow into the connecting pipe through the upper conducting pipe 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, the lower end and the side of the single lithium battery 1 are cooled, and the coolant is also cooled to different degrees when flowing.

[0037] Finally, it should be noted that the above is only the best implementation mode of the present invention, but the protection scope 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 protection scope 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 arranged inside 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 lower trapezoidal liquid cooling plate (11) at the bottom layer 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. A 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. A battery pack liquid cooling device according to claim 2, characterized in that: The plurality of upper condensation plates (8) in the upper inverted trapezoidal liquid cooling plate (10) are of the same size and are arranged in parallel.

4. A 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. A 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 step end. During the flow, the upper end of the single lithium battery (1) is cooled.

6. A 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. A 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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