Battery pack heat dissipation device and battery pack

Abstract

The utility model discloses a battery pack heat dissipation device and a battery pack. The battery pack heat dissipation device comprises a plurality of groups of liquid cooling pipes which are arranged on the outer side of a to-be-cooled battery cell; each liquid cooling pipe comprises at least one heat dissipation water inlet part, at least one heat dissipation water outlet part and a connecting part; the sum of the sectional areas of all the heat dissipation water inlet parts in the direction perpendicular to the flow velocity direction of the cooling liquid is larger than the sum of the sectional areas of all the heat dissipation water outlet parts in the direction perpendicular to the flow velocity direction of the cooling liquid. According to the utility model, the temperature difference of the to-be-cooled battery cells in the battery pack is reduced, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack heat dissipation device and a battery pack. Background Art

[0002] The current thermal management solutions for lithium battery products, whether using indirect liquid cooling technology with a bottom liquid cooling plate or direct liquid cooling technology with immersion liquid, all use flow ducts with equal cross-sections.

[0003] When the coolant flows into the area near the outlet of the flow pipe with equal cross-section, the coolant has the same flow rate in the flow pipe with equal cross-section and absorbs a lot of heat after flowing through the heated lithium battery, which causes the temperature of the coolant near the outlet of the flow pipe to increase, resulting in poor cooling effect of the lithium battery near the outlet of the flow channel. This results in a large temperature difference in the battery pack, which will affect the life of the battery pack. Utility Model Content

[0004] The utility model provides a battery pack heat dissipation device and a battery pack, so as to reduce the temperature difference of electric cores to be cooled in the battery pack and prolong the service life of the battery pack.

[0005] According to one aspect of the utility model, a battery pack heat dissipation device is provided, and the battery pack heat dissipation device comprises:

[0006] A plurality of groups of liquid cooling tubes, wherein the plurality of groups of liquid cooling tubes are arranged outside a battery cell to be cooled;

[0007] Each liquid cooling tube includes at least one heat dissipation water inlet, at least one heat dissipation water outlet and a connecting portion, each heat dissipation water inlet is connected to a first end of the connecting portion, and each heat dissipation water outlet is connected to a second end of the connecting portion; the sum of the cross-sectional areas of each heat dissipation water inlet in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant.

[0008] Furthermore, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is equal to the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water outlet portion in the direction perpendicular to the coolant flow direction;

[0009] Or, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water outlet portion in the direction perpendicular to the coolant flow direction;

[0010] The difference between the cross-sectional area of ​​the connecting portion in a direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each heat dissipation water inlet portion in a direction perpendicular to the flow velocity of the coolant is a first difference;

[0011] The difference between the cross-sectional area of ​​the connection portion in a direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the flow velocity of the coolant is a second difference;

[0012] The second difference is greater than the first difference.

[0013] Furthermore, the number of the heat dissipation water inlet parts is different from the number of the heat dissipation water outlet parts.

[0014] Furthermore, the liquid cooling pipe includes a heat dissipation water inlet, multiple heat dissipation water outlets and a connecting part; the cross-sectional area of ​​the heat dissipation water inlet in a direction perpendicular to the coolant flow direction is the same as the cross-sectional area of ​​the connecting part in a direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting part in a direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlets in the direction perpendicular to the coolant flow direction.

[0015] Furthermore, the liquid cooling pipe includes multiple heat dissipation water inlets, a heat dissipation water outlet and a connecting part; the sum of the cross-sectional areas of the multiple heat dissipation water inlets in a direction perpendicular to the coolant flow direction is greater than the cross-sectional area of ​​the heat dissipation water outlet in a direction perpendicular to the coolant flow direction.

[0016] Further, the liquid cooling pipe includes a plurality of heat dissipation water inlet parts, a plurality of heat dissipation water outlet parts and a connection part;

[0017] The sum of the cross-sectional areas of the plurality of heat dissipation water inlets in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of the plurality of heat dissipation water outlets in a direction perpendicular to the flow direction of the coolant.

[0018] Furthermore, two adjacent liquid cooling tubes are connected via a plurality of connecting pipes.

[0019] Furthermore, the liquid cooling pipe includes a heat dissipation water inlet portion, two heat dissipation water outlet portions and a connecting portion.

[0020] Furthermore, the liquid cooling pipe includes two heat dissipation water inlet parts, a heat dissipation water outlet part and a connecting part.

[0021] According to another aspect of the present invention, a battery pack is provided, the battery pack comprising:

[0022] A plurality of battery cells to be cooled;

[0023] A plurality of battery pack heat dissipation devices are provided one by one on the outside of the battery cells to be cooled, and the battery pack heat dissipation devices are the battery pack heat dissipation devices described in any of the above embodiments.

[0024] The battery pack heat dissipation device designed in the embodiment of the utility model comprises a plurality of groups of liquid cooling tubes, each of which comprises at least one heat dissipation water inlet, at least one heat dissipation water outlet and a connection part. By arranging the plurality of groups of liquid cooling tubes outside a battery cell to be cooled, a plurality of heat dissipation water inlets are connected to a first end of the connection part, a plurality of heat dissipation water outlets are connected to a second end of the connection part, and the sum of the cross-sectional areas of each heat dissipation water inlet in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant, so that the embodiment of the utility model can be By reducing the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the coolant flow rate direction, and under the condition of unchanged flow rate, the flow rate of the coolant flowing through the heat dissipation water inlet is made smaller than the flow rate of the coolant flowing through the heat dissipation water outlet, the flow rate of the coolant flowing through the heat dissipation water outlet in the liquid cooling tube is increased, and the local heat dissipation effect is improved by increasing the local flow rate, thereby making the heat dissipation effect of the coolant at the heat dissipation water inlet position and the heat dissipation effect of the coolant at the heat dissipation water outlet position tend to be the same, reducing the temperature difference of the battery cells to be cooled in the battery pack and extending the service life of the battery pack.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of a battery pack heat dissipation device provided according to an embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a liquid cooling tube provided according to an embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model;

[0030] Figure 4 It is a structural schematic diagram of another liquid cooling tube provided according to an embodiment of the utility model;

[0031] Figure 5 It is a simulation schematic diagram of a liquid cooling tube provided according to an embodiment of the utility model;

[0032] Figure 6 It is a simulation schematic diagram of another liquid cooling tube provided according to an embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model;

[0034] Figure 8 It is a structural schematic diagram of another liquid cooling tube provided according to an embodiment of the utility model. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] The present invention provides a heat dissipation device for a battery pack. Figure 1 is a schematic structural diagram of a battery pack heat dissipation device provided according to an embodiment of the utility model. Figure 2 is a schematic diagram of the structure of a liquid cooling tube provided according to an embodiment of the utility model, with reference to Figure 1 and Figure 2 , the battery pack heat dissipation device includes:

[0038] A plurality of groups of liquid cooling tubes 1, wherein the plurality of groups of liquid cooling tubes 1 are arranged outside a battery cell 2 to be cooled;

[0039] Each liquid cooling tube 1 includes at least one heat dissipation water inlet 11, at least one heat dissipation water outlet 12 and a connecting portion 13, each heat dissipation water inlet 11 is connected to a first end of the connecting portion 13, and each heat dissipation water outlet 12 is connected to a second end of the connecting portion 13; the sum of the cross-sectional areas of each heat dissipation water inlet in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant.

[0040] Among them, at least one can be understood as one or more than one, and the specific number can be set according to actual conditions, and the embodiments of the present utility model do not limit this.

[0041] Specifically, a heat dissipation water inlet 11, a heat dissipation water outlet 12 and a connection portion 13 may be provided. The cross-sectional area of ​​the connection portion 13 in a direction perpendicular to the flow direction of the coolant, the cross-sectional area of ​​the heat dissipation water inlet 11 in a direction perpendicular to the flow direction of the coolant, and the cross-sectional area of ​​the heat dissipation water outlet 12 in a direction perpendicular to the flow direction of the coolant are designed according to the heat dissipation requirements of the battery pack. For example, Figure 2 As shown, since the temperature of the battery cell 2 to be cooled at the water outlet of the liquid cooling tube of the battery pack heat dissipation device is greater than the temperature of the battery cell 2 to be cooled at the water inlet of the liquid cooling tube, it is necessary to design the cross-sectional area of ​​the heat dissipation water inlet 11 in the direction perpendicular to the coolant flow direction to be larger than the cross-sectional area of ​​the heat dissipation water outlet 12 in the direction perpendicular to the coolant flow direction.

[0042] Figure 3 is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model, referring to Figure 3 Since the temperature of the battery cell 2 to be cooled at the water outlet of the liquid cooling tube of the battery pack heat dissipation device is greater than the temperature of the battery cell 2 to be cooled at the water inlet of the liquid cooling tube, the liquid cooling tube 1 can also be provided with a plurality of heat dissipation water inlets 11, a heat dissipation water outlet 12 and a connecting portion 13. Exemplarily, the liquid cooling tube 1 can include two heat dissipation water inlets 11, and at this time, the cross-sectional area of ​​the connecting portion 13 in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the plurality of heat dissipation water inlets 11 in the direction perpendicular to the coolant flow direction. At the same time, the cross-sectional area of ​​the heat dissipation water outlet 12 in the direction perpendicular to the coolant flow direction is equal to the cross-sectional area of ​​the heat dissipation water inlet 11 in the direction perpendicular to the coolant flow direction.

[0043] Figure 4 is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model, referring to Figure 4Since the temperature of the battery cell 2 to be cooled at the water outlet of the liquid cooling pipe of the battery pack heat dissipation device is greater than the temperature of the battery cell 2 to be cooled at the water inlet of the liquid cooling pipe, the liquid cooling pipe can be provided with a heat dissipation water inlet 11, a plurality of heat dissipation water outlets 12 and a connecting portion 13. For example, the liquid cooling pipe 1 can include two heat dissipation water outlets 12. At this time, the cross-sectional area of ​​the connecting portion 13 in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the plurality of heat dissipation water outlets 12 in the direction perpendicular to the coolant flow direction. At the same time, the heat dissipation water inlet 11 needs to be provided in the direction perpendicular to the coolant flow direction according to actual conditions. The cross-sectional area in the vertical direction, for example, the cross-sectional area of ​​the heat dissipation water inlet 11 in the direction perpendicular to the coolant flow velocity direction can be set to be the same as the cross-sectional area of ​​the connection part 13 in the direction perpendicular to the coolant flow velocity direction; the cross-sectional area of ​​the heat dissipation water inlet 11 in the direction perpendicular to the coolant flow velocity direction can also be set to be smaller than the cross-sectional area of ​​the connection part 13 in the direction perpendicular to the coolant flow velocity direction, and the cross-sectional area of ​​the heat dissipation water inlet 11 in the direction perpendicular to the coolant flow velocity direction is greater than the sum of the cross-sectional areas of multiple heat dissipation water outlets 12 in the direction perpendicular to the coolant flow velocity direction. By testing the blank group and the control group of the liquid cooling tube, in the blank group, a liquid cooling tube with the same cross-sectional area in the direction perpendicular to the coolant flow velocity direction was used, and the coolant flow velocity at the outlet of the liquid cooling tube was measured to be 1m / s, the temperature of the battery cell to be cooled was 21.69°C, and the average temperature of the battery cell as a whole was 21.7°C. In the control group, a liquid cooling tube including a heat dissipation water inlet 11, two heat dissipation water outlets 12 and a connecting part 13 was used. At this time, the coolant flow rate at the outlet of the liquid cooling tube was measured to be 1.25m / s, the temperature of the battery cell to be cooled was 21.57℃, and the average temperature of the battery cell as a whole was 21.57℃. According to the experimental comparison, the experimental data of the control group was better than the experimental data of the blank group, which reduced the temperature difference of the battery cell to be cooled in the battery pack. For example, Figure 5 is a simulation schematic diagram of a liquid cooling tube blank group provided according to an embodiment of the utility model, Figure 6 is a simulation schematic diagram of a liquid cooling tube control group provided according to an embodiment of the utility model. Figure 5 and Figure 6 As shown in the simulation results, the maximum temperature of the tested cells in the blank group is 23.86°C, and the maximum temperature of the tested cells in the control group is 23.66°C. According to the comparison of simulation results, the experimental data of the control group is better than that of the blank group, which improves the cooling effect of the battery pack heat dissipation device.

[0044] A liquid cooling pipe may also be provided, including a plurality of heat dissipation water inlet portions 11, a plurality of heat dissipation water outlet portions 12 and a connecting portion 13. Figure 7 is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model, referring to Figure 7Since the temperature of the battery cell 2 to be cooled at the water outlet of the liquid cooling tube of the battery pack heat dissipation device is greater than the temperature of the battery cell 2 to be cooled at the water inlet of the liquid cooling tube, the sum of the cross-sectional areas of the multiple heat dissipation water inlet portions 11 in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlet portions 12 in the direction perpendicular to the coolant flow direction. Exemplarily, the liquid cooling tube may include two heat dissipation water inlet portions 11 and three heat dissipation water outlet portions 12.

[0045] The battery pack heat dissipation device designed in the embodiment of the utility model comprises a plurality of groups of liquid cooling tubes 1, each of which comprises at least one heat dissipation water inlet 11, at least one heat dissipation water outlet 12 and a connecting portion 13. By arranging the plurality of groups of liquid cooling tubes 1 outside a battery cell 2 to be cooled, a plurality of heat dissipation water inlets 11 are connected to a first end of the connecting portion 13, a plurality of heat dissipation water outlets 12 are connected to a second end of the connecting portion 13, and the sum of the cross-sectional areas of each heat dissipation water inlet 11 in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of each heat dissipation water outlet 12 in a direction perpendicular to the flow direction of the coolant, so that the utility model The embodiment reduces the sum of the cross-sectional areas of each heat dissipation water outlet 12 in a direction perpendicular to the flow velocity of the coolant, and under the condition of constant flow rate, makes the flow velocity of the coolant flowing through the heat dissipation water inlet 11 less than the flow velocity of the coolant flowing through the heat dissipation water outlet 12, the flow velocity of the coolant flowing through the heat dissipation water outlet 12 in the liquid cooling tube 1 is increased, and the local heat dissipation effect is improved by increasing the local flow velocity, thereby making the heat dissipation effect of the coolant at the heat dissipation water inlet 11 and the heat dissipation effect of the coolant at the heat dissipation water outlet 12 approach to the same, thereby reducing the temperature difference of the battery cells to be cooled in the battery pack and extending the service life of the battery pack.

[0046] Furthermore, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is equal to the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water outlet portion in the direction perpendicular to the coolant flow direction;

[0047] Or, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water outlet portion in the direction perpendicular to the coolant flow direction;

[0048] The difference between the cross-sectional area of ​​the connecting portion in a direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each heat dissipation water inlet portion in a direction perpendicular to the flow velocity of the coolant is a first difference;

[0049] The difference between the cross-sectional area of ​​the connection portion in a direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the flow velocity of the coolant is a second difference;

[0050] The second difference is greater than the first difference.

[0051] Specifically, the cross-sectional area of ​​the connecting portion in a direction perpendicular to the coolant flow rate is set to be equal to the sum of the cross-sectional areas of each heat dissipation water inlet in a direction perpendicular to the coolant flow rate, and the cross-sectional area of ​​the connecting portion in a direction perpendicular to the coolant flow rate is larger than the sum of the cross-sectional areas of each heat dissipation water outlet in a direction perpendicular to the coolant flow rate. This can make the flow rate of the coolant flowing through the heat dissipation water inlet smaller than the flow rate of the coolant flowing through the heat dissipation water outlet, increase the flow rate of the coolant flowing through the heat dissipation water outlet in the liquid cooling tube, improve the local heat dissipation effect by increasing the local flow rate, and thereby make the heat dissipation effect of the coolant at the heat dissipation water inlet position and the heat dissipation effect of the coolant at the heat dissipation water outlet position tend to be the same, reduce the temperature difference of the battery cells to be cooled in the battery pack, and extend the service life of the battery pack.

[0052] The cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each heat dissipation water outlet portion in the direction perpendicular to the coolant flow direction, and the difference between the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction and the sum of the cross-sectional areas of each heat dissipation water inlet portion in the direction perpendicular to the coolant flow direction is less than the sum of the cross-sectional areas of the connecting portion in the direction perpendicular to the coolant flow direction. The difference between the cross-sectional area in the direction and the sum of the cross-sectional areas of each heat dissipation water outlet in the direction perpendicular to the coolant flow rate direction can also make the flow rate of the coolant flowing through the heat dissipation water inlet smaller than the flow rate of the coolant flowing through the heat dissipation water outlet. The flow rate of the coolant flowing through the heat dissipation water outlet in the liquid cooling tube is increased, and the local heat dissipation effect is improved by increasing the local flow rate, so that the heat dissipation effect of the coolant at the heat dissipation water inlet is similar to the heat dissipation effect of the coolant at the heat dissipation water outlet, thereby reducing the temperature difference of the battery cells to be cooled in the battery pack and extending the service life of the battery pack.

[0053] Furthermore, the number of the heat dissipation water inlet parts is different from the number of the heat dissipation water outlet parts.

[0054] Specifically, the number of heat dissipation water inlets is different from the number of heat dissipation water outlets. For example, the liquid cooling pipe can be provided with one heat dissipation water inlet, multiple heat dissipation water outlets and a connecting portion, or the liquid cooling pipe can be provided with multiple heat dissipation water inlets, one heat dissipation water outlet and a connecting portion, or the liquid cooling pipe can be provided with multiple heat dissipation water inlets, multiple heat dissipation water outlets and a connecting portion.

[0055] Further, such as Figure 4 As shown, the liquid cooling pipe includes a heat dissipation water inlet 11, multiple heat dissipation water outlets 12 and a connecting portion 13; the cross-sectional area of ​​the heat dissipation water inlet 11 in a direction perpendicular to the coolant flow direction is the same as the cross-sectional area of ​​the connecting portion 13 in a direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion 13 in a direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlets 12 in a direction perpendicular to the coolant flow direction.

[0056] Specifically, since the temperature of the battery cell to be cooled at the water outlet of the liquid cooling pipe of the battery pack heat dissipation device is greater than the temperature of the battery cell to be cooled at the water inlet of the liquid cooling pipe, a liquid cooling pipe can be provided including a heat dissipation water inlet 11, multiple heat dissipation water outlets 12 and a connecting portion 13, and the cross-sectional area of ​​the heat dissipation water inlet 11 in a direction perpendicular to the coolant flow rate direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlets 12 in a direction perpendicular to the coolant flow rate direction, and the coolant flow rate in the heat dissipation water outlet 12 can be increased by reducing the cross-sectional area of ​​the heat dissipation water outlet 12 in a direction perpendicular to the coolant flow rate direction, thereby improving the heat dissipation effect at the heat dissipation water outlet 12, so that the heat dissipation effect of the coolant at the heat dissipation water inlet is similar to the heat dissipation effect of the coolant at the heat dissipation water outlet, thereby reducing the temperature difference of the battery cell to be cooled in the battery pack and extending the service life of the battery pack, and by providing multiple heat dissipation water outlets 12, the cooling effect of the battery cell to be cooled in the battery pack near the water outlet of the battery pack heat dissipation device is increased.

[0057] For further reference, Figure 3 The liquid cooling pipe includes multiple heat dissipation water inlets 11, a heat dissipation water outlet 12 and a connecting portion 13; the sum of the cross-sectional areas of the multiple heat dissipation water inlets 11 in a direction perpendicular to the flow direction of the coolant is greater than the cross-sectional area of ​​the heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant.

[0058] Specifically, since the temperature of the battery cell to be cooled at the water outlet of the liquid cooling pipe of the battery pack heat dissipation device is greater than the temperature of the battery cell to be cooled at the water inlet of the liquid cooling pipe, a liquid cooling pipe can be provided including multiple heat dissipation water inlets 11, a heat dissipation water outlet 12 and a connecting portion 13, and the sum of the cross-sectional areas of the multiple heat dissipation water inlets 11 in a direction perpendicular to the coolant flow rate direction is greater than the cross-sectional area of ​​the heat dissipation water outlet in a direction perpendicular to the coolant flow rate direction, so that the coolant flow rate in the heat dissipation water inlet 11 is less than the coolant flow rate in the heat dissipation water outlet 12, thereby improving the heat dissipation effect at the position of the heat dissipation water inlet 11, and making the heat dissipation effect of the coolant at the position of the heat dissipation water inlet and the heat dissipation effect of the coolant at the position of the heat dissipation water outlet approach to be the same, thereby reducing the temperature difference of the battery cell to be cooled in the battery pack and extending the service life of the battery pack, and by providing multiple heat dissipation water inlets 11, the cooling effect of the battery cell to be cooled in the battery pack near the water inlet of the battery pack heat dissipation device can be increased.

[0059] For further reference, Figure 7 , the liquid cooling pipe includes a plurality of heat dissipation water inlet parts, a plurality of heat dissipation water outlet parts and a connecting part;

[0060] The sum of the cross-sectional areas of the plurality of heat dissipation water inlets 11 in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of the plurality of heat dissipation water outlets 12 in a direction perpendicular to the flow direction of the coolant.

[0061] Specifically, the simultaneous provision of multiple heat dissipation water inlets 11 and multiple heat dissipation water outlets 12 can simultaneously increase the cooling flow rate at the water inlet of the liquid cooling tube and the coolant flow rate at the water outlet of the liquid cooling tube, thereby improving the overall heat dissipation effect on the battery cells to be cooled in the battery pack. Since the temperature of the battery cells to be cooled at the water outlet of the liquid cooling tube of the battery pack heat dissipation device is greater than the temperature of the battery cells to be cooled at the water inlet of the liquid cooling tube, the sum of the cross-sectional areas of the multiple heat dissipation water inlets 11 in the direction perpendicular to the coolant flow rate direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlets 12 in the direction perpendicular to the coolant flow rate direction, so that the heat dissipation effect of the coolant at the heat dissipation water inlet position and the heat dissipation effect of the coolant at the heat dissipation water outlet position tend to be the same, thereby increasing the heat dissipation effect at the water outlet of the liquid cooling tube, reducing the temperature difference of the battery cells to be cooled in the battery pack, and extending the service life of the battery pack.

[0062] Furthermore, Figure 8 is a schematic diagram of the structure of another liquid cooling tube provided according to an embodiment of the utility model, referring to Figure 8 , two adjacent liquid cooling tubes 1 are connected by a plurality of connecting pipes 3 .

[0063] Specifically, a plurality of connecting pipes 3 may be arranged between two adjacent liquid cooling tubes 1. This can prevent abnormalities at the water inlet of one or some of the liquid cooling tubes 1, which prevent the cooling liquid from being transported normally. In this case, the cooling liquid is transported to the abnormal liquid cooling tubes 1 through the connecting pipes 3 via other liquid cooling tubes 1, so as to avoid local high temperatures in the battery cells to be cooled in the battery pack.

[0064] For further reference, Figure 4 The liquid cooling pipe includes a heat dissipation water inlet portion 11, two heat dissipation water outlet portions 12 and a connecting portion 13.

[0065] For further reference, Figure 3 The liquid cooling pipe includes two heat dissipation water inlet parts 11, a heat dissipation water outlet part 12 and a connecting part 13.

[0066] The present invention provides a battery pack, which includes:

[0067] A plurality of battery cells to be cooled;

[0068] A plurality of battery pack heat dissipation devices are provided one by one on the outside of the battery cells to be cooled, and the battery pack heat dissipation devices are the battery pack heat dissipation devices described in any of the above embodiments.

[0069] The battery pack designed in the embodiment of the utility model comprises a plurality of battery cells to be cooled and a plurality of battery pack heat dissipation devices, and the battery pack heat dissipation devices are arranged one by one on the outside of the battery cells to be cooled, so that the battery pack heat dissipation device can reduce the cross-sectional area of ​​the liquid cooling tube at the position with higher local temperature according to the temperature distribution of the battery cells to be cooled, and under the condition of constant flow rate, the flow rate of the coolant flowing through the heat dissipation water inlet is less than the flow rate of the coolant flowing through the heat dissipation water outlet, and the flow rate of the coolant flowing through the heat dissipation water outlet in the liquid cooling tube is increased, and the local heat dissipation effect is improved by increasing the local flow rate, so that the heat dissipation effect of the coolant at the heat dissipation water inlet and the heat dissipation effect of the coolant at the heat dissipation water outlet are close to each other, thereby reducing the temperature difference of the battery cells to be cooled in the battery pack and extending the service life of the battery pack.

[0070] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0071] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A battery pack heat dissipation device, characterized in that: include: A plurality of groups of liquid cooling tubes, wherein the plurality of groups of liquid cooling tubes are arranged outside a battery cell to be cooled; Each of the liquid cooling tubes includes at least one heat dissipation water inlet, at least one heat dissipation water outlet and a connecting portion, each of the heat dissipation water inlet is connected to the first end of the connecting portion, and each of the heat dissipation water outlet is connected to the second end of the connecting portion; the sum of the cross-sectional areas of each of the heat dissipation water inlet in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of each of the heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant.

2. The battery pack heat dissipation device according to claim 1, characterized in that: The cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is equal to the sum of the cross-sectional areas of each of the heat dissipation water inlet portions in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each of the heat dissipation water outlet portions in the direction perpendicular to the coolant flow direction; Or, the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each of the heat dissipation water inlet portions in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting portion in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of each of the heat dissipation water outlet portions in the direction perpendicular to the coolant flow direction; The difference between the cross-sectional area of ​​the connecting portion in a direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each of the heat dissipation water inlet portions in a direction perpendicular to the flow velocity of the coolant is a first difference; The difference between the cross-sectional area of ​​the connecting portion in the direction perpendicular to the flow velocity of the coolant and the sum of the cross-sectional areas of each of the heat dissipation water outlets in the direction perpendicular to the flow velocity of the coolant is a second difference; The second difference is greater than the first difference.

3. The battery pack heat dissipation device according to claim 1, characterized in that: The number of the heat dissipation water inlet parts is different from the number of the heat dissipation water outlet parts.

4. The battery pack heat dissipation device according to claim 3, characterized in that: The liquid cooling pipe includes one heat dissipation water inlet, multiple heat dissipation water outlets and the connecting part; the cross-sectional area of ​​the heat dissipation water inlet in the direction perpendicular to the coolant flow direction is the same as the cross-sectional area of ​​the connecting part in the direction perpendicular to the coolant flow direction, and the cross-sectional area of ​​the connecting part in the direction perpendicular to the coolant flow direction is greater than the sum of the cross-sectional areas of the multiple heat dissipation water outlets in the direction perpendicular to the coolant flow direction.

5. The battery pack heat dissipation device according to claim 3, characterized in that: The liquid cooling pipe includes a plurality of the heat dissipation water inlets, a heat dissipation water outlet and the connecting portion; the sum of the cross-sectional areas of the plurality of the heat dissipation water inlets in a direction perpendicular to the flow direction of the coolant is greater than the cross-sectional area of ​​the heat dissipation water outlet in a direction perpendicular to the flow direction of the coolant.

6. The battery pack heat dissipation device according to claim 3, characterized in that: The liquid cooling pipe comprises a plurality of the heat dissipation water inlet parts, a plurality of the heat dissipation water outlet parts and the connecting part; The sum of the cross-sectional areas of the plurality of heat dissipation water inlets in a direction perpendicular to the flow direction of the coolant is greater than the sum of the cross-sectional areas of the plurality of heat dissipation water outlets in a direction perpendicular to the flow direction of the coolant.

7. The battery pack heat dissipation device according to claim 1, characterized in that: Two adjacent liquid cooling tubes are connected via a plurality of connecting pipes.

8. The battery pack heat dissipation device according to claim 4, characterized in that: The liquid cooling pipe includes one heat dissipation water inlet portion, two heat dissipation water outlet portions and the connecting portion.

9. The battery pack heat dissipation device according to claim 5, characterized in that: The liquid cooling pipe includes two heat dissipation water inlet parts, one heat dissipation water outlet part and the connecting part.

10. A battery pack, characterized in that: include: A plurality of battery cells to be cooled; A plurality of battery pack heat dissipation devices, wherein the battery pack heat dissipation devices are arranged one by one on the outside of the battery cells to be cooled, and the battery pack heat dissipation devices are the battery pack heat dissipation devices as described in any one of claims 1-9.

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