Battery pack with liquid cooling structure

Abstract

The utility model belongs to the technical field of power battery packs, and particularly relates to a battery pack with a liquid cooling structure, which comprises a battery pack body, and at least two groups of battery cell modules I and battery cell modules II arranged in the battery pack body, and liquid cooling plates are vertically arranged on the side edges of the battery cell modules I and the battery cell modules II; the liquid cooling plate comprises a straight plate piece, and an end plate I and an end plate II which are connected to two ends of the straight plate piece; the same-side end parts of the straight plate pieces of every two liquid cooling plates are communicated with a first pipeline; two ends of the first pipeline are respectively connected to the outer side of the battery pack body through a second pipeline and a third pipeline to form a liquid cooling channel; the battery pack provided by the utility model is provided with the at least two vertical liquid cooling plates, so that the two side surfaces are respectively in contact with the side wall of each battery cell, the heat exchange area is enlarged, and the temperature control time of the battery cells is shortened by half through large-surface cooling of the battery cells; the bottom liquid cooling plate is not affected by the gravity of the battery core, and the material selection is wide; and the liquid cooling plate adopts a brazing sintering process, so that the reliability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of power battery packs, and in particular relates to a battery pack with a liquid cooling structure. Background Art

[0002] At present, the mainstream solution for energy storage / power liquid cooling is to place the liquid cooling plate at the bottom of the battery cell. The bottom cooling has the following disadvantages: the battery cell itself has a large thermal resistance, the liquid cooling / heating response is slow, the bottom area of ​​the battery cell is small, and the heat exchange area with the cold plate is small. On the market, most of the liquid cooling plates are a whole plate placed under the battery cell, and there are also the following problems:

[0003] 1. The bottom liquid cooling plate is brazed with the whole plate, which has high process requirements and high cost;

[0004] 2. The bottom liquid cooling plate is friction brazed, which is costly and has a low yield rate;

[0005] 3. The bottom liquid cooling plate adopts the buried pipe welding process, which has limited pipeline layout, large space occupation, long internal liquid cooling channel path and high energy consumption;

[0006] 4. The bottom liquid cooling plate is only in contact with the bottom surface of the battery cell, and the liquid cooling plate is in single-sided contact, resulting in low utilization rate and low heat exchange efficiency;

[0007] 5. The bottom liquid cooling plate system generally needs to bear and withstand the pressure of the battery, and will use relatively heavy aluminum profiles with high structural strength, and its material cost is expensive. Utility Model Content

[0008] The purpose of the present utility model is to provide a battery pack with a liquid cooling structure in order to solve the above-mentioned problem.

[0009] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0010] The utility model provides a battery pack with a liquid cooling structure, comprising a battery pack body and at least two groups of battery cell modules 1 and 2 arranged inside the battery pack body, liquid cooling plates are vertically arranged on the sides of the battery cell modules 1 and 2, and the liquid cooling plates include a straight plate and end plates 1 and 2 connected at both ends thereof;

[0011] The ends of the straight plates of every two liquid cooling plates on the same side are connected with a first pipeline; the two ends of the first pipeline are respectively connected to the outside of the battery pack body through a second pipeline and a third pipeline to form a liquid cooling channel.

[0012] A further improvement is that a gap is provided between the liquid cooling plate and the battery cell module 1 and the battery cell module 2 and is filled with a heat conducting medium.

[0013] A further improvement is that the heat-conducting medium is any one of heat-conducting gel, heat-conducting pad, heat-conducting mud, and heat-conducting silicone grease.

[0014] A further improvement is that the straight plate is connected to the end plate 1 and the end plate 2 at both ends thereof by any one of brazing, friction welding, reflow welding and laser welding.

[0015] A further improvement is that the liquid cooling plate located between any group of battery cell module 1 and battery cell module 2 is fixed in the battery pack body by means of a clamp or a fixing frame.

[0016] A further improvement is that the liquid cooling plate located on one side of the battery cell module 1 close to the inner wall of the battery pack body or on the other side of the battery cell module 2 close to the inner wall of the battery pack body is fixed in the battery pack body by a fixing frame.

[0017] A further improvement is that an end plate 1 on one of the liquid cooling plates connects the straight plate member to one end of the third pipeline through a quick-plug connector, and the other end of the third pipeline is connected to a liquid inlet provided on the outside of the battery pack body; an end plate 1 on another liquid cooling plate connects the straight plate member to one end of the second pipeline through a quick-plug connector, and the other end of the second pipeline is connected to a liquid outlet provided on the outside of the battery pack body.

[0018] The beneficial effects of the utility model are:

[0019] 1. The battery pack proposed in this application has at least two vertical liquid cooling plates, so that the two sides are in contact with the side walls of each battery cell, so that the heat exchange area is expanded, and the large surface cooling of the battery cell shortens the temperature control time of the battery cell by half; compared with the bottom liquid cooling plate, it is not affected by the gravity of the battery cell, the material selection is wide, and its cost advantage is obvious; and the liquid cooling plate adopts the brazing and sintering process, and has high reliability;

[0020] 2. In the present application, at least two liquid cooling plates in the battery pack form a liquid cooling channel, and the coolant circulates through the liquid inlet and the liquid outlet, thereby realizing a series connection between at least two liquid cooling plates in a battery pack, and the liquid cooling cycle can accurately control the temperature difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the battery pack in the present utility model.

[0022] Figure 2 It is a side view of the battery pack in the utility model.

[0023] Figure 3 It is a top view of the battery pack in the utility model.

[0024] Figure 4 It is a schematic diagram of the connection between the liquid cooling plate and the battery module 1 and the battery module 2 in the utility model.

[0025] Figure 5 This utility model Figure 4 Enlarged structural diagram at A in the middle.

[0026] Figure 6 It is a side view of the liquid cooling plate in the utility model.

[0027] Figure 7 This is another top view of the battery pack in the present invention.

[0028] Figure 8 It is another side view of the battery pack in the present utility model.

[0029] Fig. 9 It is a structural schematic diagram of the liquid flow channel of the battery pack in the utility model.

[0030] In the figure: 1. Battery pack body; 2. Battery cell module 1; 3. Battery cell module 2; 4. Fixing frame; 5. Liquid cooling plate; 6. First pipeline; 7. Second pipeline; 8. Third pipeline; 9. Liquid inlet; 10. Liquid outlet; 11. Heat transfer medium; 12. Steel strip; 51. Straight plate; 52. End plate 1; 53. End plate 2; 54. Quick-connect connector. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0032] Example 1

[0033] like Figure 1-6 As shown, this embodiment proposes a battery pack with a liquid cooling structure, including a battery pack body 1, and at least two groups of battery cell modules 1 2 and battery cell modules 2 3 arranged inside the battery pack body 1, liquid cooling plates 5 are vertically arranged on the sides of the battery cell modules 1 2 and the battery cell modules 2 3, and the liquid cooling plates 5 include a straight plate 51, and an end plate 1 52 and an end plate 2 53 connected to the two ends thereof; the same side ends of the straight plate members 51 of every two of the liquid cooling plates 5 are connected to a first pipeline 6; the two ends of the first pipeline 6 are respectively connected to the outside of the battery pack body 1 through a second pipeline 7 and a third pipeline 8 to form a liquid cooling channel.

[0034] It can be understood that the liquid cooling plate 5 is arranged on the sides of the cell module 1 2 and the cell module 2 3, including: a liquid cooling plate 5 is arranged between two adjacent sides of the cell module 1 2 and the cell module 2 3, or a liquid cooling plate 5 is arranged between two adjacent sides of the cell module 1 2 and the cell module 2 3 and on the sides of the cell module 1 2 and the cell module 2 3 close to the battery pack body 1.

[0035] It should be noted that in this embodiment, a battery pack body 1 includes at least two liquid cooling plates 5. Figure 2 and 3When there are two liquid cooling plates 5, there are two groups of battery cell modules 1 2 and battery cell modules 2 3 in the battery pack body 1, and the liquid cooling plate 5 is only vertically placed between any one of the battery cell modules 1 2 and the battery cell module 2 3.

[0036] Combination Figure 6 , 8 and 9. In the present embodiment, the straight plate 51 in the liquid cooling plate 5 is specifically a profile liquid cooling plate, and the end plate 1 52 and the end plate 2 53 at both ends are plugs at both ends, and the middle of the profile is a flow channel carrier, which has high utilization rate and high heat exchange effect. In addition, the liquid cooling plate 5 in the present application adopts a vertical structure different from the prior art, and uses the profile body as the cooling interface. The two side surfaces respectively contact the side walls of each battery cell. Compared with the prior art that is placed at the bottom of the battery cell, the vertical liquid cooling plate is not affected by the gravity of the battery cell, has a wide range of material choices, and has obvious cost advantages and strong competitiveness.

[0037] Furthermore, the vertical liquid cooling plate in this embodiment expands the heat exchange area, and the large surface cooling of the battery cell shortens the temperature control time of the battery cell by half. In extreme cases, such as thermal runaway, the battery cell can be cooled quickly, effectively blocking abnormal heat conduction between the battery cells. At the same time, the water cooling effect is significantly improved, which improves safety and fast charging performance. The side cooling solution can not only solve the temperature difference between different batteries in the battery pack, but also optimize the problem of excessive temperature difference between the top and bottom of the battery.

[0038] As a further optimization solution, a gap is provided between the liquid cooling plate 5 and the battery module 1 2 and the battery module 2 3 and is filled with a heat conducting medium 11. The heat conducting medium 11 includes but is not limited to heat conducting gel, heat conducting pad, heat conducting mud and heat conducting silicone grease.

[0039] As a further optimization solution, the connection methods of the straight plate 51 and the end plates 1 52 and 2 53 at its two ends include but are not limited to brazing, friction welding, reflow welding and laser welding. In some embodiments, the sintering process of the liquid cooling plate 5 is brazing, which has high reliability; but due to the small amount of welding interface, the cost is very low.

[0040] As a further optimization scheme, the liquid cooling plate 5 located between any group of battery cell module 1 2 and battery cell module 2 3 is fixed in the battery pack body 1 by means of a clamp or a fixing frame 4, and the liquid cooling plate 5 located on one side of the battery cell module 1 2 close to the inner wall of the battery pack body 1 or the battery cell module 2 3 close to the inner wall of the battery pack body 1 is fixed in the battery pack body 1 by means of a fixing frame 4.

[0041] As a further optimization solution, the end plate 1 52 on one of the liquid cooling plates 5 connects the straight plate 51 with one end of the third pipeline 8 through a quick-connect connector 54, and the other end of the third pipeline 8 connects with the liquid inlet 9 provided on the outside of the battery pack body 1. The end plate 1 52 on the other liquid cooling plate 5 connects the straight plate 51 with one end of the second pipeline 7 through a quick-connect connector 54, and the other end of the second pipeline 7 connects with the liquid outlet 10 provided on the outside of the battery pack body 1.

[0042] It should be noted that, in this embodiment, the two straight plate members 51, the first pipeline 6, the second pipeline 7 and the third pipeline 8 are connected to the outside of the battery pack body 1 to form a liquid cooling channel, and the coolant circulates through the liquid inlet 9 and the liquid outlet 10, thereby realizing a series connection between at least two liquid cooling plates in a battery pack, and the liquid cooling cycle can accurately control the temperature difference.

[0043] As a further optimization solution, in the present application, a battery pack body 1 includes at least two groups of battery cell modules 1 2 and battery cell modules 2 3. Figure 7 , 8 9 show the arrangement of the liquid cooling plate 5 in a group of battery cell modules 1 2 and battery cell modules 2 3 in a battery pack body 1, which is specifically a battery pack body 1 including 4 liquid cooling plates 5 (only one group of battery cell modules 1 2 and battery cell modules 2 3 are shown in the figure), and the specific arrangement of the liquid cooling plate 5 includes: the liquid cooling plate 5 located between any group of battery cell modules 1 2 and battery cell modules 2 3 is fixed in the battery pack body 1 by a clamp or a fixing frame 4, and the liquid cooling plate 5 located on one side of the battery cell module 1 2 close to the inner wall of the battery pack body 1 or the battery cell module 2 3 close to the inner wall of the battery pack body 1 is fixed in the battery pack body 1 by a fixing frame 4.

[0044] According to an embodiment of the present application, four liquid cooling plates are provided in the above-mentioned further optimization scheme, which can further enhance the heat dissipation effect on the side of the battery cell.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack with a liquid cooling structure, characterized in that: The battery pack comprises a battery pack body (1), and at least two groups of battery cell modules (1) and battery cell modules (2) and (3) arranged therein; liquid cooling plates (5) are vertically arranged on the sides of the battery cell modules (2) and (3); the liquid cooling plates (5) comprise a straight plate (51), and end plates (1) and (53) connected at both ends thereof; The ends of the straight plate members (51) on the same side of every two of the liquid cooling plates (5) are connected to a first pipeline (6); the two ends of the first pipeline (6) are respectively connected to the outside of the battery pack body (1) through a second pipeline (7) and a third pipeline (8) to form a liquid cooling channel.

2. A battery pack with a liquid cooling structure according to claim 1, characterized in that: A gap is provided between the liquid cooling plate (5) and the first battery module (2) and the second battery module (3), and the gap is filled with a heat-conducting medium (11).

3. A battery pack with a liquid cooling structure according to claim 2, characterized in that: The heat-conducting medium (11) is any one of heat-conducting gel, heat-conducting pad, heat-conducting mud and heat-conducting silicone grease.

4. The battery pack with a liquid cooling structure according to claim 1, characterized in that: The straight plate (51) is connected to the end plate 1 (52) and the end plate 2 (53) at its two ends by any one of brazing, friction welding, reflow welding and laser welding.

5. The battery pack with a liquid cooling structure according to claim 1, characterized in that: The liquid cooling plate (5) located between any one group of battery cell module 1 (2) and battery cell module 2 (3) is fixed in the battery pack body (1) by means of a clamp or a fixing frame (4).

6. The battery pack with a liquid cooling structure according to claim 1, characterized in that: The liquid cooling plate (5) located on one side of the battery cell module 1 (2) close to the inner wall of the battery pack body (1) or on one side of the battery cell module 2 (3) close to the inner wall of the battery pack body (1) is fixed in the battery pack body (1) via a fixing frame (4).

7. The battery pack with a liquid cooling structure according to claim 1, characterized in that: An end plate 1 (52) on one of the liquid cooling plates (5) connects the straight plate member (51) to one end of the third pipeline (8) via a quick-insert connector (54), and the other end of the third pipeline (8) connects to a liquid inlet (9) provided on the outside of the battery pack body (1); an end plate 1 (52) on another of the liquid cooling plates (5) connects the straight plate member (51) to one end of the second pipeline (7) via a quick-insert connector (54), and the other end of the second pipeline (7) connects to a liquid outlet (10) provided on the outside of the battery pack body (1).

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