Energy storage battery liquid cooling system

Abstract

The utility model discloses a liquid cooling system for an energy storage battery, including a liquid cooling plate and a fixing frame, wherein the liquid cooling plate is arranged on the fixing frame, and a plurality of U-shaped flow channel groups are arranged in the liquid cooling plate, wherein the flow channel groups include an outer branch flow channel and an inner branch flow channel, both of which are U-shaped, wherein the outer branch flow channel is arranged along the outer side of the inner branch flow channel, wherein a first liquid inlet section is arranged at one end of the outer branch flow channel, a first liquid outlet section is arranged at the other end of the outer branch flow channel, a second liquid inlet section is arranged at one end of the inner branch flow channel, and a second liquid outlet section is arranged at the other end of the inner branch flow channel, wherein the first liquid inlet section and the second liquid inlet section are on the same side or on different sides. The utility model ensures that there is sufficient flow contact area between the coolant, liquid cooling plate and battery module, strengthens the cooling effect of the liquid cooling plate, enhances the consistency of the battery temperature distribution in the same module, and improves the temperature balancing capacity of the liquid cooling plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a liquid cooling system for an energy storage battery. Background Art

[0002] Energy storage batteries, taking lithium batteries as an example, their service life is closely related to the operating temperature. It is generally believed that the optimal operating temperature range of lithium batteries is 10-35°C. Too low temperature will cause the electrolyte to solidify and the impedance to increase, while too high temperature will cause the diaphragm to melt easily.

[0003] The energy storage batteries are closely arranged, with high heat generation power but uneven heat dissipation. When the temperature difference of the batteries arranged in the same box is greater than 10°C, the battery life will be shortened by more than 15%. The temperature rise difference between the energy storage battery modules will increase the internal resistance difference, and the life of all batteries will be further shortened. Therefore, the goal of thermal management of energy storage batteries should not only ensure that the battery modules operate within the appropriate temperature range, but also try to ensure that the temperature inside the module is uniform. However, the current liquid cooling system only focuses on overall cooling, and the temperature rise difference is not paid attention to. Therefore, it is necessary to propose a new liquid cooling device to solve the above problems. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a liquid cooling system for energy storage batteries, which ensures that there is sufficient flow contact area between the coolant-liquid cooling plate-battery module, strengthens the cooling effect of the liquid cooling plate, enhances the consistency of battery temperature distribution in the same module, and improves the temperature equalization capacity of the liquid cooling plate.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is as follows:

[0006] A liquid cooling system for an energy storage battery comprises a liquid cooling plate and a fixing frame, wherein the liquid cooling plate is arranged on the fixing frame, and a plurality of U-shaped flow channel groups are arranged in the liquid cooling plate, wherein the flow channel groups comprise outer branch flow channels and inner branch flow channels, both of which are U-shaped, wherein the outer branch flow channels are arranged along the outer side of the inner branch flow channels, wherein a first liquid inlet section is arranged at one end of the outer branch flow channels, and a first liquid outlet section is arranged at the other end of the outer branch flow channels, wherein a second liquid inlet section is arranged at one end of the inner branch flow channels, and a second liquid outlet section is arranged at the other end of the inner branch flow channels, wherein the first liquid inlet section and the second liquid inlet section are located on the same side or on different sides.

[0007] Preferably, a plurality of connecting strips are provided on the top surface of the liquid cooling plate, the connecting strips are detachably connected to the liquid cooling plate, an electrical connector connected to an energy storage battery is provided on the connecting strip, an electrical conductive strip is also provided on the top surface of the liquid cooling plate, a plurality of electrical conductive parts are provided on the electrical conductive strip, and the electrical conductive parts are electrically connected to the connecting strip.

[0008] Preferably, the width of the flow channels on both sides of the outer branch flow channel is the same as the width of the flow channels on both sides of the inner branch flow channel.

[0009] More preferably, in the outer branch flow channel, the widths of the first liquid inlet section and the first liquid outlet section are smaller than the widths of the flow channels on both sides, and in the inner branch flow channel, the widths of the second liquid inlet section and the second liquid outlet section are smaller than the widths of the flow channels on both sides.

[0010] More preferably, the first liquid inlet section, the first liquid outlet section, the second liquid inlet section and the second liquid outlet section are flush, and in the same flow channel group, the flow channel ends of the inner branch flow channel and the outer branch flow channel are flush.

[0011] Preferably, the outer branch flow channel is provided with a plurality of first flow channel bosses along the liquid flow direction, and gaps are provided between adjacent first flow channel bosses; the inner branch flow channel is provided with a plurality of second flow channel bosses along the liquid flow direction, and gaps are provided between adjacent second flow channel bosses.

[0012] More preferably, the first flow channel boss is in the shape of an elongated strip, the second flow channel boss is in the shape of an elongated strip, and within the flow channel group, the first flow channel boss is parallel to the second flow channel boss.

[0013] Preferably, a plurality of the flow channel groups are arranged side by side, and the gap width between adjacent flow channel groups is less than or equal to the gap width between the two sides of the inner branch flow channels in the flow channel group.

[0014] Preferably, the fixing frame includes an outer frame and a plurality of first support bars, the outer frame is arranged along the bottom edge of the liquid cooling plate, the plurality of first support bars are arranged in parallel in the outer frame, the first support bars are fixedly connected to the liquid cooling plate, corresponding to the flow channel parts of the outer branch flow channel and the inner branch flow channel, and both ends of the first support bars are fixedly connected to the outer frame.

[0015] Preferably, the fixed frame also includes a plurality of second support bars, and the plurality of second support bars are arranged in parallel in the outer frame, the second support bars are fixedly connected to the liquid cooling plate, corresponding to parts of the first liquid inlet section, the first liquid outlet section, the second liquid inlet section and the second liquid outlet section, the second support bars are parallel to the first support bars, and both ends of the second support bars are fixedly connected to the outer frame.

[0016] Beneficial effects:

[0017] The liquid cooling plate of the utility model is installed on a fixed frame, and the overall load-bearing strength and structural strength are improved. The flow channel group in the liquid cooling plate is U-shaped, ensuring that there is sufficient flow contact area between the coolant-liquid cooling plate-battery module, thereby enhancing the cooling effect of the liquid cooling plate. This structure can enhance the consistency of battery temperature distribution in the same module, improve the temperature balancing ability of the liquid cooling plate, control the temperature difference within 2°C, and effectively meet the requirements of the energy storage battery module for temperature rise, temperature difference, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the bottom surface direction of the utility model;

[0019] Figure 2 Shown is a schematic diagram of the flow channel group in the liquid cooling plate, wherein the first liquid inlet section and the second liquid inlet section are on the same side;

[0020] Figure 3 Shown is a schematic diagram of the top surface direction of the utility model;

[0021] Figure 4 Shown is a temperature cloud diagram of thermal simulation of a battery module in some embodiments;

[0022] Figure 5 Shown Figure 4 Temperature simulation data diagram of the same position in the battery module.

[0023] Reference numerals: 1-liquid cooling plate, 2-fixing frame, 3-electrical conductive strip, 4-electrical conductive member, 5-connecting strip, 6-electrical connecting member;

[0024] 11-external branch flow channel, 12-inner branch flow channel, 13-first liquid inlet section, 14-second liquid inlet section, 15-first liquid outlet section, 16-second liquid outlet section, 17-first flow channel boss, 18-second flow channel boss;

[0025] 21 - outer frame, 22 - first support bar, 23 - second support bar. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0027] The technical solution of the utility model is described in detail below with specific embodiments.

[0028] like Figure 1-3As shown, the utility model proposes a liquid cooling system for an energy storage battery, comprising a liquid cooling plate 1 and a fixing frame 2, wherein the liquid cooling plate 1 is arranged on the fixing frame 2, and a plurality of U-shaped flow channel groups are arranged in the liquid cooling plate 1. It is easy to understand that the manufacturing method of the liquid cooling plate 1 is the same as that of the prior art, that is, the liquid cooling plate 1 comprises a bottom plate and a cover plate, a depression is formed in the bottom plate or the cover plate, and after the bottom plate and the cover plate are sealed and connected, the depression therein forms a flow channel group.

[0029] In the utility model, the flow channel group includes an outer branch flow channel 11 and an inner branch flow channel 12, both of which are U-shaped. The outer branch flow channel 11 is arranged along the outer side of the inner branch flow channel 12. A first liquid inlet section 13 is arranged at one end of the outer branch flow channel 11, and a first liquid outlet section 15 is arranged at the other end of the outer branch flow channel 11. A second liquid inlet section 14 is arranged at one end of the inner branch flow channel 12, and a second liquid outlet section 16 is arranged at the other end of the inner branch flow channel 12, wherein the first liquid inlet section 13 and the second liquid inlet section 14 are on the same side or different sides.

[0030] It should be noted that, in the present invention, one side of the outer branch channel 11 or one side of the inner branch channel 12 refers to one of the long sides of the U-shaped structure of the outer branch channel 11 or the inner branch channel 12, and the part between the two long sides is a connecting section. Figure 2 As shown, the inner branch flow channel 12 is a smaller U-shape, and the outer branch flow channel 11 is a larger U-shape. The inner branch flow channel 12 in the same flow channel group and the outer branch flow channel 11 on the same side are close to each other.

[0031] Preferably, a plurality of connecting strips 5 are provided on the top surface of the liquid cooling plate 1, and the connecting strips 5 are detachably connected to the liquid cooling plate 1. An electrical connector 6 connected to the energy storage battery is provided on the connecting strip 5. An electrical conductive strip 3 is also provided on the top surface of the liquid cooling plate 1, and a plurality of electrical conductive parts 4 are provided on the electrical conductive strip 3. The electrical conductive parts 4 are electrically connected to the connecting strip 5.

[0032] Combined with Figure 3 It can be seen that the function of the multiple connecting bars 5 is to connect the multiple energy storage batteries into a whole and output electricity through the electrical conductive bar 3. It is easy to understand that the connecting bars 5 and the electrical conductive bar 3 can be made of insulating materials, and the electrical connector 6 and the electrical conductive member 4 are made of conductive materials.

[0033] Preferably, the width of the flow channels on both sides of the outer branch flow channel 11 is the same as the width of the flow channels on both sides of the inner branch flow channel 12. Figure 2 It can be seen that in the present invention, based on the parallel distribution of multiple flow channel groups, a cooling zone is formed on the surface of the liquid cooling plate 1 , and the U-shaped structure can enhance the cooling capacity of the liquid cooling plate 1 .

[0034] More preferably, in the outer branch channel 11, the widths of the first liquid inlet section 13 and the first liquid outlet section 15 are both smaller than the widths of the channels on both sides, and in the inner branch channel 12, the widths of the second liquid inlet section 14 and the second liquid outlet section 16 are both smaller than the widths of the channels on both sides. The width of the liquid inlet section in the channel group is smaller than the corresponding channel width, which is conducive to the coolant filling the channel when entering the channel. More preferably, the widths of the first liquid inlet section 13, the first liquid outlet section 15, the second liquid inlet section 14 and the second liquid outlet section 16 are the same. Figure 2 As shown, the first liquid inlet section 13, the first liquid outlet section 15, the second liquid inlet section 14 and the second liquid outlet section 16 are flush with each other, and in the same flow channel group, the flow channel ends of the inner branch flow channel 12 and the outer branch flow channel 11 are flush with each other.

[0035] In addition, the design of the U-shaped flow channel is also conducive to installing energy storage batteries of different sizes. Specifically, the installation methods of the utility model and the battery pack include at least the following:

[0036] In some embodiments, cooling positions are formed on both sides of the outer branch, that is, the outer branch flow channel 11 has two cooling positions, and cooling positions are formed on both sides of the inner branch flow channel 12, that is, the inner branch flow channel 12 has two cooling positions, so one flow channel group has four cooling positions, and each cooling position can be installed with one or more groups of energy storage batteries, and the energy storage batteries are arranged relatively densely. In this case, the first liquid inlet section 13 and the second liquid inlet section 14 can be on the same side or on different sides. Preferably, the first liquid inlet section 13 and the second liquid inlet section 14 are on different sides, and the flow direction of the liquid inside the outer branch flow channel 11 and the inner branch flow channel 12 has a better cooling effect on the densely arranged energy storage batteries as a whole, which is convenient for controlling the temperature difference between the energy storage battery groups.

[0037] In some embodiments, the outer branch flow channel 11 and the inner branch flow channel 12 form a cooling position on the same side, each flow channel group has two cooling positions, and each cooling position can be installed with one or more groups of energy storage batteries. In this case, the first liquid inlet section 13 and the second liquid inlet section 14 can be on the same side or on different sides. For example, Figure 3 As shown, two groups of energy storage batteries are installed at each cooling position, and a total of eight groups of energy storage batteries are installed in the two flow channel groups. The thermal simulation temperature cloud map and temperature simulation data map of the eight groups of energy storage batteries are shown in Figure 4-5 As shown, it can be seen that the utility model ensures that the temperature distribution on the top of the battery in the battery module has good consistency, so that the temperature difference at the same measuring point of multiple groups of energy storage batteries is controlled within 2°C.

[0038] In some embodiments, the outer branch flow channel 11 and the inner branch flow channel 12 form a cooling position as a whole, that is, each flow channel group has a cooling position, and each flow channel group can be installed with one or more energy storage batteries. In this case, the first liquid inlet section 13 and the second liquid inlet section 14 can be on the same side or on different sides. Preferably, the first liquid inlet section 13 and the second liquid inlet section 14 are on different sides, that is, the liquid flows in the outer branch flow channel 11 and the inner branch flow channel 12 in opposite directions.

[0039] In some embodiments, energy storage batteries of different sizes and specifications can be installed on the liquid cooling plate 1 to completely cover the cooling position on the liquid cooling plate 1 .

[0040] It is easy to understand that the connection strips 5 on the top surface of the liquid cooling plate 1 are determined according to the layout positions of the energy storage batteries, and the energy storage batteries on the liquid cooling plate 1 are connected into a whole.

[0041] In order to further improve the liquid cooling effect, the outer branch flow channel 11 is provided with a plurality of first flow channel bosses 17 along the liquid flow direction, and gaps are provided between adjacent first flow channel bosses 17, and the inner branch flow channel 12 is provided with a plurality of second flow channel bosses 18 along the liquid flow direction, and gaps are provided between adjacent second flow channel bosses 18. The functions of the first flow channel bosses 17 and the second flow channel bosses 18 are to increase the flow channel width, reduce the flow resistance, and enhance the structural strength of the flow channel plate, so that the heat exchange between the coolant and the energy storage battery is more sufficient, and the cooling effect is improved.

[0042] Preferably, the first flow channel boss 17 is in the shape of an elongated strip, and the second flow channel boss 18 is in the shape of an elongated strip, and in the flow channel group, the first flow channel boss 17 is parallel to the second flow channel boss 18. It is easy to understand that when multiple flow channel groups are arranged in parallel, the first flow channel boss 17 and the second flow channel boss 18 are also in a state of being parallel to each other.

[0043] When multiple flow channel groups are arranged side by side, the gap width between adjacent flow channel groups is less than or equal to the gap width between the two sides of the inner branch flow channel 12 in the flow channel group. Preferably, the gap width between adjacent flow channel groups is equal to the gap width between the two sides of the inner branch flow channel 12 in the flow channel group. Figure 2 As shown, in each channel group, the outer branch channel 11 and the inner branch channel 12 on the same side can be regarded as an independent cooling unit, and one channel group contains two cooling units. When the gap width between adjacent channel groups is the same as the gap between two units in the channel group, multiple channel groups can be regarded as cooling units with twice the number, and energy storage batteries are appropriately arranged on the surface of the liquid cooling plate 1 corresponding to the cooling unit. When multiple groups of energy storage batteries are closely arranged, the cooling effect and the temperature difference can be controlled.

[0044] In the utility model, the fixing frame 2 includes an outer frame 21 and a plurality of first support bars 22. The outer frame 21 is arranged along the bottom edge of the liquid cooling plate 1. The plurality of first support bars 22 are arranged in parallel in the outer frame 21. The first support bars 22 are fixedly connected to the liquid cooling plate 1, corresponding to the flow channel parts of the outer branch flow channel 11 and the inner branch flow channel 12, and both ends of the first support bars 22 are fixedly connected to the outer frame 21.

[0045] Furthermore, the fixed frame 2 also includes a plurality of second support bars 23, and the plurality of second support bars 23 are arranged in parallel in the outer frame 21. The second support bars 23 are fixedly connected to the liquid cooling plate 1, corresponding to parts of the first liquid inlet section 13, the first liquid outlet section 15, the second liquid inlet section 14 and the second liquid outlet section 16. The second support bars 23 are parallel to the first support bars 22, and both ends of the second support bars 23 are fixedly connected to the outer frame 21.

[0046] Furthermore, a heat insulation layer is provided between adjacent first support bars 22 or adjacent second support bars 23 or between the first support bars 22 and the second support bars 23 to prevent condensation from forming on the back side of the liquid cooling plate 1 .

[0047] The embodiments provided by the utility model are described in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A liquid cooling system for energy storage batteries, characterized in that: The invention comprises a liquid cooling plate (1) and a fixing frame (2), wherein the liquid cooling plate (1) is arranged on the fixing frame (2), and a plurality of U-shaped flow channel groups are arranged in the liquid cooling plate (1), wherein the flow channel groups comprise an outer branch flow channel (11) and an inner branch flow channel (12), both of which are U-shaped, wherein the outer branch flow channel (11) is arranged along the outer side of the inner branch flow channel (12), wherein a first liquid inlet section (13) is arranged at one end of the outer branch flow channel (11), and a first liquid outlet section (15) is arranged at the other end of the outer branch flow channel (11), wherein a second liquid inlet section (14) is arranged at one end of the inner branch flow channel (12), and a second liquid outlet section (16) is arranged at the other end of the inner branch flow channel (12), wherein the first liquid inlet section (13) and the second liquid inlet section (14) are located on the same side or on different sides.

2. The energy storage battery liquid cooling system according to claim 1, characterized in that: A plurality of connecting strips (5) are arranged on the top surface of the liquid cooling plate (1), the connecting strips (5) are detachably connected to the liquid cooling plate (1), an electrical connector (6) connected to the energy storage battery is arranged on the connecting strips (5), an electrical conductive strip (3) is also arranged on the top surface of the liquid cooling plate (1), a plurality of electrical conductive parts (4) are arranged on the electrical conductive strip (3), and the electrical conductive parts (4) are electrically connected to the connecting strip (5).

3. The energy storage battery liquid cooling system according to claim 1, characterized in that: The width of the flow channels on both sides of the outer branch flow channel (11) is the same as the width of the flow channels on both sides of the inner branch flow channel (12).

4. The energy storage battery liquid cooling system according to claim 3, characterized in that: In the outer branch flow channel (11), the widths of the first liquid inlet section (13) and the first liquid outlet section (15) are both smaller than the widths of the flow channels on both sides; and in the inner branch flow channel (12), the widths of the second liquid inlet section (14) and the second liquid outlet section (16) are both smaller than the widths of the flow channels on both sides.

5. The energy storage battery liquid cooling system according to claim 1, characterized in that: The first liquid inlet section (13), the first liquid outlet section (15), the second liquid inlet section (14) and the second liquid outlet section (16) are flush with each other; and within the same flow channel group, the flow channel ends of the inner branch flow channel (12) and the outer branch flow channel (11) are flush with each other.

6. The energy storage battery liquid cooling system according to any one of claims 1 to 5, characterized in that: The outer branch flow channel (11) is provided with a plurality of first flow channel bosses (17) along the liquid flow direction, and gaps are provided between adjacent first flow channel bosses (17); the inner branch flow channel (12) is provided with a plurality of second flow channel bosses (18) along the liquid flow direction, and gaps are provided between adjacent second flow channel bosses (18).

7. The energy storage battery liquid cooling system according to claim 6, characterized in that: The first flow channel boss (17) is in the shape of an elongated strip, and the second flow channel boss (18) is in the shape of an elongated strip. In the flow channel group, the first flow channel boss (17) is parallel to the second flow channel boss (18).

8. The energy storage battery liquid cooling system according to claim 1, characterized in that: A plurality of the flow channel groups are arranged side by side, and the gap width between adjacent flow channel groups is less than or equal to the gap width between two sides of the inner branch flow channel (12) within the flow channel group.

9. The energy storage battery liquid cooling system according to claim 1, characterized in that: The fixing frame (2) comprises an outer frame (21) and a plurality of first support bars (22); the outer frame (21) is arranged along the bottom edge of the liquid cooling plate (1); the plurality of first support bars (22) are arranged in parallel inside the outer frame (21); the first support bars (22) are fixedly connected to the liquid cooling plate (1) and correspond to the flow channel portions of the outer branch flow channel (11) and the inner branch flow channel (12); and both ends of the first support bars (22) are fixedly connected to the outer frame (21).

10. The energy storage battery liquid cooling system according to claim 9, characterized in that: The fixing frame (2) further comprises a plurality of second support bars (23), the plurality of second support bars (23) being arranged in parallel in the outer frame (21), the second support bars (23) being fixedly connected to the liquid cooling plate (1), corresponding to parts of the first liquid inlet section (13), the first liquid outlet section (15), the second liquid inlet section (14) and the second liquid outlet section (16), the second support bars (23) being parallel to the first support bars (22), and both ends of the second support bars (23) being fixedly connected to the outer frame (21).

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