Battery liquid cooling structure

Abstract

The utility model provides a kind of battery liquid cooling structure, is composed of bottom liquid cooling plate and side liquid cooling plate, inside is equipped with the total branch flow channel and branch flow channel, overall adopts 1 in 1 out structure, after cooling liquid enters bottom liquid cooling plate, by total branch flow channel is divided into several series-parallel branch flow channel, for cooling multiple battery cell groups, under the premise of traditional bottom cooling, increase side liquid cooling plate, adopt similar structure with the bottom liquid cooling plate, under the premise of increasing battery pack heat exchange area, the position of higher battery pack center temperature is cooled, improve the cooling efficiency of battery pack whole, reduce the temperature difference between battery pack whole battery cell, improve battery pack service life.

Description

Technical Field

[0001] This utility model relates to the field of power thermal management technology, and in particular to a battery liquid cooling structure. Background Technology

[0002] Currently, with the development of the new energy industry, lithium batteries are gradually being used in new energy vehicles, energy storage and consumer electronics. Due to their high energy density and high charge and discharge rate performance, lithium batteries are also gradually being used in the motorcycle industry. However, during use, the high charge and discharge rate can cause the battery temperature to rise too high, which can affect its performance and lifespan. If the temperature rise is not effectively handled, it may even cause thermal runaway, resulting in a short circuit or explosion of the battery.

[0003] The mainstream thermal management solutions for lithium batteries on the market mainly adopt two methods: air cooling and liquid cooling. Traditional air cooling is simple and convenient, but its cooling surface has a small heat transfer coefficient and low heat transfer efficiency, making it difficult to meet the requirements of rapid heat dissipation. Liquid cooling uses liquid cooling at the bottom of the battery pack, but its heat transfer area is small, the contact thermal resistance between the battery pack and the liquid cooling plate is large, and the heat transfer efficiency is low, making bottom cooling ineffective. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a battery liquid cooling structure to solve the technical problem that existing liquid cooling methods use liquid cooling at the bottom of the battery pack, but the heat exchange area is small, the contact thermal resistance between the battery pack and the liquid cooling plate is large, and the heat transfer efficiency is low, resulting in poor performance of bottom cooling.

[0005] This utility model provides a battery liquid cooling structure, including:

[0006] Bottom liquid cooling plate and side liquid cooling plate;

[0007] The bottom liquid cooling plate is provided with an inlet and an outlet on each side, and the bottom coolant is provided with a main branch channel and a branch channel that are connected inside. The inlet and outlet are respectively connected to the main branch channel and the branch channel. The bottom liquid cooling plate is provided with a first fixing screw hole on its lower surface, and the bottom liquid cooling plate is provided with a channel conversion inlet and a channel conversion outlet on its upper surface. The channel conversion inlet and the channel conversion outlet are provided corresponding to the main branch channel.

[0008] The side liquid cooling plate has a second fixing screw hole on the side away from the bottom liquid cooling plate for fixed connection with the battery pack bracket, and a third fixing screw hole corresponding to the first fixing screw hole on the other side, as well as a flow channel connection inlet and a flow channel connection outlet corresponding to the flow channel conversion inlet and flow channel conversion outlet, respectively. The interior of the side liquid cooling plate has a U-shaped flow channel with the ends connected, and the two ends of the U-shaped flow channel are respectively connected to the flow channel conversion inlet and flow channel conversion outlet.

[0009] Optionally, the branch flow channel includes:

[0010] It consists of at least two sets of S-shaped flow channels connected end to end, with one end of the S-shaped flow channel connected to the liquid inlet and the other end connected to the liquid outlet.

[0011] Optionally, the bottom liquid cooling plate includes:

[0012] Its bottom is provided with the flow channel groove opened along the edge of the S-shaped flow channel.

[0013] Optionally, the side liquid cooling plate is provided in at least three sets.

[0014] Optionally, the interior of the side liquid cooling plate is provided with U-shaped flow channels connected end to end, including:

[0015] Set up at least five sets of U-shaped flow channels connected end to end.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] Composed of a bottom liquid cooling plate and side liquid cooling plates, both internally equipped with a main flow channel and branch flow channels, the overall structure adopts a 1-in-1-out configuration. After the coolant enters the bottom liquid cooling plate, it is divided into several series-parallel branch flow channels through the main flow channel to cool multiple cell groups. Based on traditional bottom cooling, a side liquid cooling plate is added, adopting a similar structure to the bottom liquid cooling plate. While increasing the heat exchange area of ​​the battery pack, it cools the areas with higher temperatures in the center of the battery pack, improving the overall cooling efficiency of the battery pack, reducing the temperature difference between the cells, and extending the battery pack's service life. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a perspective view of the overall structure of this utility model;

[0020] Figure 3 This is a bottom view of the present invention;

[0021] Figure 4This is a schematic diagram of the bottom liquid cooling plate in this utility model;

[0022] Figure 5 This is a schematic diagram of the side liquid cooling plate in this utility model.

[0023] Explanation of icon numbers:

[0024] 1. Bottom liquid cooling plate; 101. Liquid inlet; 102. Liquid outlet; 103. Main branch channel; 104. Branch channel; 105. First fixing screw hole; 106. Channel conversion inlet; 107. Channel conversion outlet; 108. Channel groove; 2. Side liquid cooling plate; 201. Second fixing screw hole; 202. Channel connection inlet; 203. Channel connection outlet; 204. U-shaped channel; 205. Third fixing screw hole.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solutions of this utility model are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0027] See Figure 1 and Figure 2 This utility model provides a battery liquid cooling structure, comprising:

[0028] Bottom liquid cooling plate 1 and side liquid cooling plate 2;

[0029] The bottom liquid cooling plate 1 is provided with an inlet 101 and an outlet 102 on each side, and the bottom coolant is provided with a main branch channel 103 and a branch channel 104 that are connected. The inlet 101 and the outlet 102 are respectively connected to the main branch channel 103 and the branch channel 104. The bottom liquid cooling plate 1 is provided with a first fixing screw hole 105 on its lower surface, and the bottom liquid cooling plate 1 is provided with a channel conversion inlet 106 and a channel conversion outlet 107 on its upper surface. The channel conversion inlet 106 and the channel conversion outlet 107 are provided corresponding to the main branch channel 103.

[0030] The side liquid cooling plate 2 has a second fixing screw hole 201 on the side away from the bottom liquid cooling plate 1 for fixed connection with the battery pack bracket, and a third fixing screw hole 205 corresponding to the first fixing screw hole 105 on the other side, as well as a flow channel connection inlet 202 and a flow channel connection outlet 203 corresponding to the flow channel conversion inlet 106 and the flow channel conversion outlet 107, respectively. The interior of the side liquid cooling plate 2 has a U-shaped flow channel 204 with the ends connected, and the two ends of the U-shaped flow channel 204 are respectively connected to the flow channel conversion inlet 106 and the flow channel conversion outlet 107.

[0031] See Figures 1 to 5 In this embodiment, the main body of the bottom liquid cooling plate 1 is a plate frame structure, which provides bottom support for the battery cell assembly. It has a main branch channel 103 and a branch channel 104 connected inside. The overall liquid cooling circuit adopts a one-in-one-out liquid cooling circuit. The main branch channel 103 and the branch channel 104 are serpentine channels. Each side of the bottom liquid cooling plate 1 is provided with an inlet 101 and an outlet 102. The coolant flows into the main branch channel 103 and the branch channel 104 after entering through the inlet 101. The branch channel 104 is the flow channel of the bottom liquid cooling plate 1 and is used to cool the bottom of the battery pack. When the main branch channel 103 flows through the side liquid cooling plate 2, it is diverted into the side liquid cooling plate 2 again through the channel conversion inlet 106 and the channel connection inlet 202, and then flows back to the branch channel 104 through the channel conversion outlet 107 and the channel connection outlet 203. Finally, it flows out through the outlet 102 of the branch channel 104 to cool the side of the cell pack, reduce the overall temperature of the battery pack and the temperature difference between the cells, and increase the overall service life of the battery pack.

[0032] Furthermore, the side liquid cooling plate 2 and the bottom liquid cooling plate 1 are fixed by means of the first fixing screw hole 105 and the third fixing screw hole 205 and by brazing. This can effectively avoid the safety risk caused by the overflow of coolant due to insufficient welding strength, and improve the overall electrical safety and structural stability of the battery pack. In addition, the top of the side liquid cooling plate 2 is fixed to the battery pack bracket by means of screw connection, which provides good support for the battery module and fixes the cell group in the liquid cooling system, which increases the overall structural stability of the battery pack and avoids battery pack failure caused by the movement of the module under the battery pack operating conditions.

[0033] In another embodiment, the branch channel 104 includes:

[0034] It consists of at least two sets of S-shaped flow channels connected end to end, with one end of the S-shaped flow channel connected to the liquid inlet 101 and the other end connected to the liquid outlet 102.

[0035] See Figure 2The branch flow channel 104 adopts an S-shaped flow channel with the ends connected. The S-shaped flow channel is arranged in a horizontal serpentine pattern inside the bottom liquid cooling plate 1. The flowing coolant cools the bottom of the battery pack and reduces the overall temperature of the battery pack.

[0036] In another embodiment, it includes:

[0037] Its bottom is provided with a flow channel groove 108 opened along the edge of the S-shaped flow channel.

[0038] See Figure 3 The bottom liquid cooling plate 1 has irregularly sized flow channel grooves 108 along the edge of the liquid cooling channel. This structure makes the flow channel part resemble a reinforcing rib, which improves the structural strength of the liquid cooling plate, reduces the overall weight of the battery pack, and increases the energy density of the battery pack, thus meeting the current lightweight requirements of battery pack systems.

[0039] In another embodiment, the side liquid cooling plate 2 is provided with at least three sets.

[0040] See Figures 1 to 3 At least three sets of side liquid cooling plates 2 are used to improve the cooling efficiency of the battery pack.

[0041] In another embodiment, the interior of the side liquid cooling plate 2 is provided with a U-shaped flow channel 204 with the ends connected, including:

[0042] Set at least five sets of U-shaped flow channels 204 connected end to end.

[0043] The use of at least five sets of U-shaped flow channels 204 connected end to end increases the heat exchange area for battery pack cooling, improves battery pack cooling efficiency, and further reduces the temperature difference between battery pack cells.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A battery liquid cooling structure, characterized in that, include: Bottom liquid cooling plate (1) and side liquid cooling plate (2); The bottom liquid cooling plate (1) is provided with an inlet (101) and an outlet (102) on each side, and the bottom liquid cooling plate (1) is provided with a main branch channel (103) and a branch channel (104) that are connected inside. The inlet (101) and the outlet (102) are respectively connected to the main branch channel (103) and the branch channel (104). The bottom liquid cooling plate (1) is provided with a first fixing screw hole (105) on the lower surface, and the bottom liquid cooling plate (1) is provided with a channel conversion inlet (106) and a channel conversion outlet (107) on the upper surface. The channel conversion inlet (106) and the channel conversion outlet (107) are opened corresponding to the main branch channel (103). The side liquid cooling plate (2) has a second fixing screw hole (201) for fixing to the battery pack bracket on one side away from the bottom liquid cooling plate (1), and a third fixing screw hole (205) corresponding to the first fixing screw hole (105) on the other side. It also has a flow channel connection inlet (202) and a flow channel connection outlet (203) corresponding to the flow channel conversion inlet (106) and the flow channel conversion outlet (107), respectively. The side liquid cooling plate (2) has a U-shaped flow channel (204) connected end to end inside. The two ends of the U-shaped flow channel (204) are connected to the flow channel conversion inlet (106) and the flow channel conversion outlet (107), respectively.

2. The battery liquid cooling structure as described in claim 1, characterized in that, The branch channel (104) includes: It consists of at least two sets of S-shaped flow channels connected end to end, with one end of the S-shaped flow channel connected to the liquid inlet (101) and the other end connected to the liquid outlet (102).

3. The battery liquid cooling structure as described in claim 2, characterized in that, The bottom liquid cooling plate (1) includes: Its bottom is provided with a channel groove (108) opened along the edge of the S-shaped channel.

4. The battery liquid cooling structure as described in claim 1, characterized in that, The side liquid cooling plate (2) is provided in at least three sets.

5. The battery liquid cooling structure as described in claim 1, characterized in that, The side liquid cooling plate (2) has a U-shaped flow channel (204) with the ends connected, including: Set at least five sets of U-shaped flow channels connected end to end (204).

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