Full-immersion liquid cooling structure and battery pack

Abstract

The utility model relates to the technical field of battery cooling, in particular to a full immersion liquid cooling structure and a battery pack, the full immersion liquid cooling structure comprises a box body and a liquid cooling plate, the liquid cooling plate is fixed on the box body, the liquid cooling plate is provided with a flow channel, the bottom of the flow channel is provided with a plurality of liquid distribution ports, the box body is internally provided with a plurality of battery cell mounting positions, and the battery cell mounting positions are arranged in the box body. The box body is provided with a plurality of liquid distribution ports, the liquid distribution ports are arranged corresponding to the battery cell mounting positions, so that the cooling medium in the flow channel can directly flow to the pole of each battery cell from the liquid distribution ports, and a liquid discharge pipe is arranged in the box body and is used for discharging the cooling medium in the box body. According to the utility model, the rapid cooling of the position of the pole is realized, the cooling medium poured on the pole or the connecting aluminum bar flows downwards, so that the temperatures of the upper part and the lower part of the battery cell are more uniform, each battery cell corresponds to the liquid separation port, and the cooling medium directly cools each battery cell, so that the temperature difference between the battery cells is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery cooling technical field, concretely relates to a full submersion liquid cooling structure and battery pack. BACKGROUND

[0002] Energy storage lithium battery goes to big, battery capacity does bigger and bigger, along with which comes the battery thermal management difficulty sharp rise, the current industry mainly adopts the way of bottom liquid cooling plate to carry out liquid cooling, but battery heat production is mainly in the upper part of the battery, therefore often causes the temperature difference of the battery to be big, the industry about next generation energy storage liquid cooling mode is inclined to full submersion liquid cooling.

[0003] The utility model discloses a battery pack and energy storage device, the battery pack includes liquid cooling plate assembly, is located in the casing, in the height direction along the electric core module, the liquid cooling plate assembly is equipped with liquid inlet, and the casing is equipped with liquid outlet, the liquid inlet and the liquid outlet are equipped with opposite two sides of the electric core module, the liquid cooling plate assembly is equipped with the shunt structure that communicates with the liquid inlet, the shunt structure is suitable for making the submersion liquid flow along the big face of the electric core, improves the heat exchange efficiency.But the temperature of the pole position of the electric core is highest in the charging and discharging process, the liquid cooling plate assembly of the above cannot improve the cooling effect of the pole position, and the problem of local high temperature of the electric core still exists. UTILITY MODEL CONTENTS

[0004] The utility model discloses a battery pack and energy storage device, the battery pack includes liquid cooling plate assembly, is located in the casing, in the height direction along the electric core module, the liquid cooling plate assembly is equipped with liquid inlet, and the casing is equipped with liquid outlet, the liquid inlet and the liquid outlet are equipped with opposite two sides of the electric core module, the liquid cooling plate assembly is equipped with the shunt structure that communicates with the liquid inlet, the shunt structure is suitable for making the submersion liquid flow along the big face of the electric core, improves the heat exchange efficiency.But the temperature of the pole position of the electric core is highest in the charging and discharging process, the liquid cooling plate assembly of the above cannot improve the cooling effect of the pole position, and the problem of local high temperature of the electric core still exists.

[0005] In order to solve the above technical problems, the utility model provides a kind of full submersion liquid cooling structure, including box and liquid cooling plate, the liquid cooling plate is fixed on the box, flow passage is provided on the liquid cooling plate, the bottom of the flow passage is equipped with multiple liquid outlets, multiple electric core installation sites are provided in the box, the liquid outlet is correspondingly arranged with the electric core installation site, so that the cooling medium in the flow passage can flow directly from liquid outlet to the pole of each electric core, drain pipe is provided in the box, and the drain pipe is used to discharge the cooling medium in the box.

[0006] In some embodiments, one end of the drain pipe extends to the bottom of the box, and the other end of the drain pipe extends upward.

[0007] In some embodiments, the other end of the drain pipe extends from the top of the box, so that the liquid level of the cooling medium in the box is higher than the pole of the electric core.

[0008] The utility model provides a battery pack, including a plurality of battery module, the battery module includes a plurality of electric core, a plurality of the liquid distribution port with the pole of a plurality of electric core one to one.

[0009] In some embodiments, the flow channel includes a main flow channel and a plurality of branch flow channels, the main flow channel is connected with the plurality of branch flow channels, and the plurality of branch flow channels are arranged in parallel, and the branch flow channel is parallel to the battery module.

[0010] In some embodiments, each battery module corresponds to one or two branch flow channels.

[0011] In some embodiments, each battery module corresponds to one branch flow channel, a plurality of branch flow channels are arranged on the branch flow channel, the plurality of branch flow channels are arranged on both sides of the branch flow channel, and the liquid distribution port is arranged on the branch flow channel.

[0012] In some embodiments, each battery module corresponds to two branch flow channels, and the two branch flow channels are arranged directly above the two poles of the electric core of the battery module.

[0013] In some embodiments, the liquid cooling plate is arranged on the upper end surface of the box body, and the liquid cooling plate is in sealing and fixed connection with the upper end surface of the box body.

[0014] In some embodiments, the liquid cooling plate is arranged on the upper end surface of the box body, and the liquid cooling plate is in sealing and fixed connection with the upper end surface of the box body.

[0015] The utility model discloses the beneficial effects are:

[0016] 1. The utility model discloses a liquid distribution port is set up on the flow channel of liquid cooling plate, and the cooling medium can be directly poured on the pole or the connecting aluminum bar, realizes the rapid cooling of the pole position, and the cooling medium poured on the pole or the connecting aluminum bar flows downward, makes the temperature of the upper part and lower part of electric core more uniform, and every electric core corresponds to the liquid distribution port, and the cooling medium directly cools every electric core, is favorable to reducing the temperature difference between electric core.

[0017] 2. The utility model discloses that the import of drain pipe is close to the bottom of box body, and the cooling medium of the bottom of box body that has absorbed a great deal of heat is discharged preferentially, and it is favorable to give full play to the cooling effect of cooling medium.

[0018] 3. The utility model discloses that the other end of drain pipe is from the top of box body and stretches out, and the outlet of drain pipe is higher than the import of liquid cooling plate, can satisfy that the cooling medium is passive extrusion, and the liquid level of cooling medium is higher than the pole of electric core.

[0019] 4. The liquid cooling plate of this utility model is set above the battery cell, so the liquid cooling plate can also be used as the top cover of the battery box, eliminating the need for a top cover of the battery box and avoiding the liquid cooling plate occupying the internal space of the box. Attached Figure Description

[0020] Figure 1 This is a schematic diagram showing the arrangement of the liquid cooling plate and drain pipe inside the housing of this utility model;

[0021] Figure 2 This is a schematic diagram of the connection structure between the liquid cooling plate and the housing of this utility model.

[0022] Attached reference numerals: 1-box; 2-liquid cooling plate; 21-main flow channel; 22-branch flow channel; 23-liquid outlet; 3-drain pipe; 4-cell; 41-terminal. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] like Figure 1 As shown, this utility model provides a fully immersed liquid cooling structure, including a housing 1 and a liquid cooling plate 2. The liquid cooling plate 2 is fixed on the housing 1 and has flow channels. Multiple liquid outlets 23 are opened at the bottom of the flow channels. Multiple battery cell 4 mounting positions are arranged inside the housing 1. The liquid outlets 23 are arranged corresponding to the battery cell 4 mounting positions, so that the cooling medium in the flow channels can flow directly from the liquid outlets 23 to the terminals 41 of each battery cell 4. The cooling medium can drip directly from the liquid outlets 23 onto the terminals 41 of the battery cell 4, or a conduit can be set at the liquid outlets 23 and flow to the terminals 41 of the battery cell 4 through the conduit. A drain pipe 3 is set inside the housing 1 to discharge the cooling medium inside the housing 1.

[0025] It should be noted that the current density is highest at the tab position of the electrode plate inside cell 4, so the temperature at the tab position on the electrode plate is the highest. The welding points between the tab and the adapter plate, the welding points between the adapter plate and the terminal 41, and the welding points between the terminal 41 and the connecting aluminum bar can all lead to high temperatures. In short, the heat generation area during the charging and discharging process of cell 4 is concentrated in the upper part of cell 4, especially at the terminal 41 position.

[0026] It can be understood that the cooling medium of the utility model enters the flow channel of the liquid cooling plate 2 from the inlet of the liquid cooling plate 2, and then flows to the pole 41 of the battery cell 4 through the liquid distribution port 23, the cooling medium in the flow channel is in a low temperature state, and directly flows to the pole 41 of the battery cell 4, so that the cooling effect of the pole 41 around the battery cell 4 can be improved, the high temperature condition of the pole 41 is avoided, and the cooling medium flowing to the pole 41 flows from top to bottom along the battery cell 4, that is, the upper part of the battery cell 4 is cooled first, and then the lower part of the battery cell 4 is cooled, so that the temperature difference between the upper and lower parts of the battery cell 4 is reduced, and the overall temperature of the battery cell 4 is uniform.

[0027] In some embodiments, as shown in Figure 1 One end of the liquid discharge pipe 3 extends to the bottom of the box body 1, and the other end of the liquid discharge pipe 3 extends upward.

[0028] Since the battery cell 4 of the utility model adopts immersion cooling, the temperature of the cooling medium close to the top of the box body 1 in the box body 1 is low, and the temperature of the cooling medium close to the bottom of the box body 1 is high, therefore, one end of the liquid discharge pipe 3 extends to the bottom of the box body 1, and the other end of the liquid discharge pipe 3 extends upward, so that the cooling medium at the bottom of the box body 1 which has absorbed a large amount of heat is preferentially discharged, and the cooling effect of the cooling medium can be fully utilized.

[0029] In some embodiments, the other end of the liquid discharge pipe 3 extends from the top of the box body 1, so that the liquid level of the cooling medium in the box body 1 is higher than the pole 41 of the battery cell 4.

[0030] It can be understood that the other end of the liquid discharge pipe 3 extends from the top of the box body 1, and the cooling medium immersed in the battery cell 4 performs hydraulic pressure from top to bottom, and the outlet of the liquid discharge pipe 3 is higher than the inlet of the liquid cooling plate 2, so that the cooling medium is passively extruded, and the liquid level of the cooling medium is higher than the pole 41 of the battery cell 4.

[0031] The second aspect, as shown in Figure 2 The utility model provides a kind of battery pack, including multiple battery modules, battery module includes multiple parallelly arranged battery cells 4, multiple battery modules are arranged in parallel, multiple liquid distribution ports 23 and the pole 41 of multiple battery cells 4 one to one. Figure 2 The battery module is not shown in the figure.

[0032] In some embodiments, as shown in Figure 2As shown, the flow channel includes a main flow channel 21 and a plurality of branch flow channels 22, the main flow channel 21 is arranged close to the edge of the liquid cooling plate 2, the main flow channel 21 is connected with the plurality of branch flow channels 22, the liquid cooling medium is provided to each branch flow channel 22 through the main flow channel 21, and the liquid cooling medium flows to the pole 41 of the battery cell 4 from each branch flow channel 22. The arrangement form of the plurality of branch flow channels 22 is various, for example, the branch flow channel 22 is arranged parallel to the battery module, then the plurality of branch flow ports 23 on one branch flow channel 22 correspond to the plurality of battery cells 4 of one battery module, or the branch flow channel 22 is arranged perpendicular to the battery module, then the plurality of branch flow ports 23 on one branch flow channel 22 correspond to one battery cell 4 of a plurality of different battery modules, Figure 2 The case in which the branch flow channel 22 is arranged parallel to the battery module is schematically shown in FIG. 5, Figure 2 The position of the branch flow channel 22 is arranged according to the position of the pole 41 of the battery cell 4 in FIG. 6.

[0033] In some embodiments, each battery module corresponds to one or two branch flow channels 22.

[0034] When the branch flow channel 22 is arranged parallel to the battery module and each battery module corresponds to one branch flow channel 22, then the branch flow channel 22 is arranged along the axis in the length direction of the battery module, a plurality of branch flow channels are arranged on the branch flow channel 22, the plurality of branch flow channels are arranged vertically on both sides of the branch flow channel 22, and the branch flow port 23 is arranged on the branch flow channel, that is, each battery cell 4 of the battery module corresponds to two symmetrical branch flow channels, and the two symmetrical branch flow channels correspond to two poles 41 of one battery cell 4 respectively.

[0035] When the branch flow channel 22 is arranged parallel to the battery module and each battery module corresponds to two branch flow channels 22, then the two branch flow channels 22 are arranged directly above the two poles 41 of the battery cell 4 of the battery module, that is, the two branch flow channels 22 correspond to the left pole 41 and the right pole 41 of all battery cells 4 of one battery module respectively.

[0036] In some embodiments, the liquid cooling plate 2 is arranged on the upper end face of the box body 1, and the liquid cooling plate 2 is sealingly and fixedly connected with the upper end face of the box body 1.

[0037] The liquid cooling plate 2 of the utility model is arranged above the battery cell 4, so that the liquid cooling plate 2 can also be used as the upper cover of the battery box body 1, the use of the upper cover of the battery box body 1 is cancelled, and the occupation of the internal space of the box body 1 by the liquid cooling plate 2 is avoided.

[0038] In some embodiments, the liquid cooling plate 2 is arranged on the upper end face of the box body 1, and the liquid cooling plate 2 is sealingly and fixedly connected with the upper end face of the box body 1.

[0039] The utility model discloses a reinforcing rib is provided on the liquid cooling plate 2, be favorable to improving the strength and rigidity of liquid cooling plate 2.

[0040] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A full immersion liquid cooling structure, characterized by: The battery module comprises a box body (1) and a liquid cooling plate (2), the liquid cooling plate (2) is fixed on the box body (1), a flow channel is arranged on the liquid cooling plate (2), a plurality of distribution ports (23) are arranged at the bottom of the flow channel, a plurality of cell (4) mounting positions are arranged in the box body (1), the distribution ports (23) are arranged corresponding to the cell (4) mounting positions, so that the cooling medium in the flow channel can directly flow from the distribution ports (23) to the pole (41) of each cell (4), and a drainage pipe (3) is arranged in the box body (1), the drainage pipe (3) is used for discharging the cooling medium in the box body (1).

2. The full immersion liquid cooling structure of claim 1, wherein: One end of the drainage pipe (3) extends to the bottom of the box body (1), and the other end of the drainage pipe (3) extends upward.

3. The full immersion liquid cooling structure of claim 2, wherein: The other end of the drainage pipe (3) extends out of the top of the box body (1), so that the liquid level of the cooling medium in the box body (1) is higher than the pole (41) of the cell (4).

4. The battery pack of any one of claims 1 to 3, wherein: The battery module comprises a plurality of battery modules, each battery module comprises a plurality of cells (4), and a plurality of distribution ports (23) correspond one-to-one to the poles (41) of the plurality of cells (4).

5. The battery pack of claim 4, wherein: The flow channel comprises a main flow channel (21) and a plurality of branch flow channels (22), the main flow channel (21) is connected with the plurality of branch flow channels (22), the plurality of branch flow channels (22) are arranged in parallel, and the branch flow channels (22) are parallel to the battery module.

6. The battery pack of claim 5, wherein: Each battery module corresponds to one or two branch flow channels (22).

7. The battery pack of claim 6, wherein: Each battery module corresponds to one branch flow channel (22), a plurality of branch flow channels are arranged on the branch flow channel (22), and the plurality of branch flow channels are arranged on both sides of the branch flow channel (22).

8. The battery pack of claim 6, wherein: Each battery module corresponds to two branch flow channels (22), and the two branch flow channels (22) are arranged directly above the two poles (41) of the cells (4) of the battery module.

9. The battery pack of any one of claims 4-8, wherein: The liquid cooling plate (2) is arranged on the upper end surface of the box body (1), and the liquid cooling plate (2) is sealingly and fixedly connected with the upper end surface of the box body (1).

10. The battery pack of any one of claims 4-8, wherein: The liquid cooling plate (2) is provided with a reinforcing rib, and the reinforcing rib is arranged in a direction perpendicular to the branch flow channel (22). The liquid cooling plate (2) is provided with a reinforcing rib, and the reinforcing rib is arranged in a direction perpendicular to the branch flow channel (22).

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