Liquid-cooled energy storage battery pack

Abstract

The utility model discloses a liquid-cooled energy storage battery pack, which relates to the technical field of batteries, and comprises a shell with an accommodating cavity, cooling liquid is carried in the accommodating cavity, a battery monomer is immersed in the cooling liquid, the shell is provided with a liquid inlet and a liquid outlet, and the shell comprises a bottom wall and a mounting wall arranged on the side edge of the bottom wall; an overflow bin is arranged on the inner surface of the mounting wall, an opening enabling the cooling liquid to flow from the containing cavity to the overflow bin is formed in the top end of the overflow bin, and the opening is located in the upper portion of the containing cavity; the liquid inlet is communicated with the containing cavity, and the liquid outlet is communicated with the overflow bin. The overflow bin is arranged in the shell of the liquid-cooled energy storage battery pack, so that the liquid-cooled energy storage battery pack is high in heat exchange efficiency and stable in heat dissipation, and cooling liquid is not easy to leak.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a liquid-cooled energy storage battery pack. Background Art

[0002] In the early days, energy storage battery packs mainly referred to the processing, assembly and packaging of lithium battery packs. The process of assembling lithium battery cells into groups is called packing, which can be a single battery or a series-parallel lithium battery pack. The battery includes battery packs, busbars, flexible connections, protection boards, outer packaging, outputs (including connectors), and auxiliary materials such as barley paper and plastic brackets. These items together make up the battery pack.

[0003] However, when using the current energy storage battery pack, the shell itself has poor heat dissipation function, which will cause the internal temperature to be high, thus affecting the battery life of the battery pack. With the advancement of technology, liquid-cooled energy storage battery packs have appeared on the market, that is, coolant is injected into the battery pack and the heat inside the battery pack is removed through the circulation of the coolant.

[0004] However, the heat exchange efficiency of the liquid-cooled energy storage battery pack in the related art is low, and the heat dissipation effect is not stable enough, so the utility model provides a new liquid-cooled energy storage battery pack. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model provides a liquid-cooled energy storage battery pack, which has the advantage of high heat exchange efficiency.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A liquid-cooled energy storage battery pack comprises a shell having a accommodating cavity, wherein the accommodating cavity carries a coolant, wherein a battery cell is immersed in the coolant, wherein the shell is provided with a liquid inlet and a liquid outlet, and wherein the shell comprises a bottom wall and a mounting wall arranged on the side of the bottom wall; an overflow bin is arranged on the inner surface of the mounting wall, wherein an opening is arranged on the top of the overflow bin for allowing the coolant to flow from the accommodating cavity to the overflow bin, and wherein the opening is located at the upper part of the accommodating cavity; wherein the liquid inlet is communicated with the accommodating cavity, and the liquid outlet is communicated with the overflow bin.

[0008] The present application provides a liquid-cooled energy storage battery pack, including a shell formed with a receiving cavity, the receiving cavity is used to carry battery cells and coolant, the battery cells and other components are immersed in the coolant to achieve the purpose of heat dissipation, and the cooling speed is fast. The shell includes a bottom wall and a mounting wall, the mounting wall is used to install an overflow bin, the coolant enters the receiving cavity from the liquid inlet, and the coolant overflowing from the upper part of the receiving cavity enters the overflow bin through the opening. It should be noted that the density of the coolant will decrease when the temperature rises, so the hot coolant will float up, that is, the coolant in the upper part of the receiving cavity is always the hot coolant after heat exchange with the battery cell, the hot coolant in the upper part of the receiving cavity enters the overflow bin through the opening at the top of the overflow bin, and the hot coolant in the overflow bin is discharged from the battery pack through the liquid outlet. This method will only discharge the hotter coolant from the battery pack, the heat exchange efficiency is high, and the battery cells can be stably dissipated, and the coolant leakage of the receiving cavity can also be prevented.

[0009] Optionally, the overflow bin includes a main board whose bottom is fixed on the bottom wall and side panels arranged on the sides of the main board, and the side panels are fixed on the inner surface of the installation.

[0010] The overflow bin includes a main board and a side board, which can be an integrated structure or a split structure connected by welding or the like. The main board, the side board and the inner surface of the mounting wall enclose a liquid accumulation space, and the coolant overflowing from the accommodating cavity enters the liquid accumulation space and is then discharged from the battery pack through the liquid outlet.

[0011] Optionally, the main board is constructed to gradually incline away from the mounting wall in a direction approaching the opening, and the cross-sectional area of ​​the overflow bin gradually decreases in a direction approaching the bottom wall.

[0012] In this embodiment, the main board is constructed to be inclined toward the battery cell side, that is, the overflow bin gradually expands from bottom to top, and the cross-sectional area of ​​the opening is larger than the cross-sectional area of ​​the bottom of the overflow bin, thereby increasing the flow rate of coolant entering the opening and improving heat exchange efficiency.

[0013] Optionally, the main board is constructed to gradually incline toward the mounting wall in a direction approaching the opening, and the cross-section of the overflow bin gradually increases in a direction approaching the bottom wall.

[0014] In this embodiment, the main board is constructed to be inclined toward the installation wall, that is, the overflow bin is gradually retracted from bottom to top, and the cross-sectional area of ​​the opening is smaller than the cross-sectional area of ​​the bottom of the overflow bin, thereby increasing the liquid storage space below the overflow bin.

[0015] Optionally, the opening is higher than the top surface of the battery cell and lower than the top surface of the shell.

[0016] The opening is higher than the top surface of the battery cell so that the battery cell is completely immersed in the coolant, thereby achieving better heat dissipation effect of the battery cell; the opening is lower than the top surface of the shell to prevent the coolant in the accommodating cavity from overflowing from the top of the shell, thereby preventing coolant leakage.

[0017] Optionally, the length of the opening is at least three fifths of the length of the accommodating cavity.

[0018] When the length of the opening is less than three-fifths of the length of the mounting wall, part of the coolant in the accommodating cavity that is far from the opening cannot be discharged in time, affecting the heat dissipation effect of the battery cell.

[0019] Optionally, a support frame is provided on the inner surface of the bottom wall, and the battery cell is placed on the top surface of the support frame.

[0020] The battery cell is placed on the support frame so that the bottom of the battery cell is also in direct contact with the coolant, thereby increasing the contact area between the battery cell and the coolant and improving the heat dissipation effect.

[0021] Optionally, a liquid distribution pipeline is provided on the inner surface of the bottom wall, and the liquid distribution pipeline is connected to the liquid inlet.

[0022] The liquid distribution pipeline is used to reasonably distribute the coolant to various parts of the accommodating cavity, so that the coolant distribution in the accommodating cavity is more uniform.

[0023] Optionally, a liquid discharge port communicating with the accommodating cavity is provided on the shell, and the liquid discharge port and the liquid inlet are arranged at two ends of the mounting wall.

[0024] The drain port communicated with the accommodating cavity and the liquid outlet communicated with the overflow bin are both arranged on the mounting wall. The drain port is used to discharge all the coolant when inspecting the inside of the battery pack.

[0025] Optionally, the coolant is a non-conductive liquid, and the temperature of the coolant at the upper end of the accommodating chamber is greater than the temperature of the coolant at the lower end of the accommodating chamber.

[0026] The coolant is a non-conductive liquid to prevent damage to the internal components of the battery pack, and the density of the coolant will decrease after absorbing heat. The hot coolant will continuously float to the upper end of the accommodating cavity. Therefore, the temperature of the coolant at the upper end of the accommodating cavity is greater than the temperature of the coolant at the lower end of the accommodating cavity.

[0027] These features and advantages of the utility model will be disclosed in detail in the following specific embodiments and drawings. The best implementation or means of the utility model will be fully presented in conjunction with the drawings, but it is not a limitation of the technical solution of the utility model. In addition, these features, elements and components appearing in each of the following texts and drawings are multiple, and are marked with different symbols or numbers for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A cross-sectional view of

[0031] Figure 3 for Figure 1 The structural diagram of some battery cells is hidden.

[0032] Among them, 1. Shell; 11. Accommodating cavity; 12. Bottom wall; 121. Liquid distribution pipeline; 122. Support frame; 13. Installation wall; 131. Overflow bin; 1311. Opening; 1312. Main board; 1313. Side panel; 14. Liquid inlet; 15. Liquid outlet; 16. Liquid discharge port; 2. Battery cell. DETAILED DESCRIPTION

[0033] The following is a detailed description of embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments in the implementation manner are intended to be used to explain the present invention and should not be construed as limiting the present invention.

[0034] References in this specification to "one embodiment" or "an example" or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment of the present patent disclosure. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0035] Example:

[0036] The present embodiment provides a liquid-cooled energy storage battery pack, comprising a shell 1 having a accommodating chamber 11, wherein the accommodating chamber 11 carries a coolant, wherein the battery cell is immersed in the coolant, wherein the shell 1 is provided with a liquid inlet 14 and a liquid outlet 15, wherein the shell 1 comprises a bottom wall 12 and a mounting wall 13 disposed on the side of the bottom wall 12; wherein an overflow bin 131 is disposed on the inner surface of the mounting wall 13, wherein an opening 1311 is disposed on the top of the overflow bin 131 for allowing the coolant to flow from the accommodating chamber 11 to the overflow bin 131, wherein the opening 1311 is located at the upper portion of the accommodating chamber 11; wherein the liquid inlet 14 is communicated with the accommodating chamber 11, and the liquid outlet 15 is communicated with the overflow bin 131.

[0037] like Figure 1 and Figure 3As shown, the liquid-cooled energy storage battery pack in this embodiment includes a box-shaped shell 1, in which a box-shaped accommodating chamber 11 is formed. The accommodating chamber 11 carries coolant, and multiple battery cells and components such as wiring harnesses are immersed in the coolant to achieve the purpose of heat dissipation. The shell 1 includes a rectangular bottom wall 12 and four side walls arranged on the sides of the bottom wall 12. The bottom wall 12 and the side walls enclose the accommodating chamber 11. It should be noted that in this embodiment, the side wall provided with the overflow bin 131 is defined as the mounting wall 13, that is, the mounting wall 13 is one of the side walls of the shell 1. The coolant enters the accommodating chamber 11 from the liquid inlet 14, and the overflow bin 131 is arranged on the inner surface of the mounting wall 13. The coolant in the accommodating chamber 11 with a height exceeding the opening 1311 of the overflow bin 131 flows to the overflow bin 131, and is discharged from the battery pack from the liquid outlet 15 connected to the overflow bin 131. As shown Figure 2 As shown by the arrow in , the coolant used in this embodiment has a lower density after heating, that is, the hot coolant floats up and enters the overflow bin 131, thereby ensuring that the hot coolant is discharged first and improving the heat exchange efficiency.

[0038] The overflow bin 131 includes a main board 1312 whose bottom is fixed on the bottom wall 12 and a side board 1313 arranged on the side of the main board 1312 . The side board 1313 is fixed on the inner surface of the installation wall 13 .

[0039] In this embodiment, the overflow bin 131 is composed of a main board 1312 and a side board 1313. The main board 1312 and the side are an integrated structure with high firmness. In other embodiments, the main board 1312 and the side board 1313 may also be a split structure connected by welding or the like. The main board 1312, the side board 1313 and the inner surface of the mounting wall 13 enclose a liquid accumulation space. The coolant overflowing from the accommodating cavity 11 enters the liquid accumulation space and is then discharged from the battery pack through the liquid outlet 15 provided on the mounting wall 13, thereby ensuring continuous and efficient heat dissipation inside the battery pack.

[0040] In this embodiment, the main board 1312 is arranged parallel to the installation wall 13, that is, the overflow bin 131 is constructed as a rectangular parallelepiped structure.

[0041] In other embodiments, the overflow bin 131 may also be constructed as follows: the main board 1312 is constructed to gradually tilt away from the mounting wall 13 in the direction approaching the opening 1311 , and the cross-sectional area of ​​the overflow bin 131 gradually decreases in the direction approaching the bottom wall 12 .

[0042] The main board 1312 is constructed to gradually move away from the installation wall 13 from bottom to top, that is, the overflow bin 131 gradually expands outward from bottom to top, and the cross-sectional area of ​​the opening 1311 is larger than the cross-sectional area of ​​the bottom of the overflow bin 131, thereby increasing the flow rate of the coolant entering the opening 1311 and improving the heat exchange efficiency.

[0043] In another embodiment, the overflow bin 131 may also be constructed as follows: the main board 1312 is constructed to gradually tilt toward the mounting wall 13 in a direction close to the opening 1311 , and the cross-section of the overflow bin 131 gradually increases in a direction close to the bottom wall 12 .

[0044] The main board 1312 is constructed to be inclined toward the installation wall 13, that is, the overflow bin 131 gradually retracts from bottom to top, and the cross-sectional area of ​​the opening 1311 is smaller than the cross-sectional area of ​​the bottom of the overflow bin 131, thereby increasing the liquid storage space below the overflow bin 131.

[0045] The opening 1311 is higher than the top surface of the battery cell and lower than the top surface of the housing 1 .

[0046] The opening 1311 is higher than the top surface of the battery cell so that the battery cell is completely immersed in the coolant, thereby achieving better heat dissipation of the battery cell; the opening 1311 is lower than the top surface of the shell 1 to prevent the coolant in the accommodating cavity 11 from overflowing from the top of the shell 1, thereby preventing coolant leakage.

[0047] The length of the opening 1311 is at least three fifths of the length of the accommodating cavity 11 .

[0048] When the length of the opening 1311 is less than three fifths of the length of the mounting wall 13 , the portion of coolant in the accommodating cavity 11 that is far from the opening 1311 cannot be discharged in time, thus affecting the heat dissipation effect of the battery cell.

[0049] A support frame 122 is disposed on the inner surface of the bottom wall 12 , and the battery cells are placed on the top surface of the support frame 122 . The support frame 122 is provided with a plurality of liquid inlet holes.

[0050] In this embodiment, the number of support frames 122 is 2. In other embodiments, the number of support frames 122 may also be 1, 3, or 4. The support frame 122 is constructed in a "J"-shaped structure. The battery cells are placed on the support frame 122 so that the bottom of the battery cells is also in direct contact with the coolant, increasing the contact area between the battery cells and the coolant and improving the heat dissipation effect. The liquid inlet hole allows the coolant to flow through the support frame 122 to the bottom of the battery cells.

[0051] A liquid distribution pipeline 121 is disposed on the inner surface of the bottom wall 12 , and the liquid distribution pipeline 121 is communicated with the liquid inlet 14 .

[0052] The liquid distribution pipeline 121 is laid on the inner surface of the bottom wall 12 , and is used to reasonably distribute the coolant to various locations of the accommodating cavity 11 , so that the coolant in the accommodating cavity 11 quickly fills the accommodating cavity 11 and is distributed more evenly.

[0053] The housing 1 is provided with a liquid discharge port 16 communicating with the accommodating chamber 11 . The liquid discharge port 16 and the liquid inlet 14 are arranged at two ends of the mounting wall 13 .

[0054] The drain port 16 connected to the accommodating chamber 11 and the liquid outlet 15 connected to the overflow bin 131 are both provided on the mounting wall 13. The drain port 16 is used to discharge all the coolant to facilitate the inspection of the inside of the battery pack. In this embodiment, the drain port 16, the liquid inlet 14 and the liquid outlet 15 are all provided on the mounting wall 13.

[0055] The coolant is a non-conductive liquid, and the temperature of the coolant at the upper end of the accommodating chamber 11 is greater than the temperature of the coolant at the lower end of the accommodating chamber 11 .

[0056] In this embodiment, the coolant is insulating cooling oil. After the coolant absorbs heat, its density decreases, and the hot coolant continuously floats to the upper end of the accommodating chamber 11, so the temperature of the coolant at the upper end of the accommodating chamber 11 is greater than the temperature of the coolant at the lower end of the accommodating chamber 11. Of course, in other embodiments, the coolant may also be other insulating coolants such as silicate solution or polymer electrolyte solution.

[0057] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention shall be included in the scope of the claims.

Claims

1. A liquid-cooled energy storage battery pack, comprising a housing (1) having a receiving cavity (11), wherein the receiving cavity (11) carries a coolant, and a battery cell is immersed in the coolant, and the housing (1) is provided with a liquid inlet (14) and a liquid outlet (15), characterized in that: The shell (1) comprises a bottom wall (12) and a mounting wall (13) arranged on the side of the bottom wall (12); an overflow bin (131) is arranged on the inner surface of the mounting wall (13); an opening (1311) is opened at the top of the overflow bin (131) to allow the coolant to flow from the accommodating cavity (11) to the overflow bin (131); the opening (1311) is located at the upper part of the accommodating cavity (11); the liquid inlet (14) is connected to the accommodating cavity (11), and the liquid outlet (15) is connected to the overflow bin (131).

2. The liquid-cooled energy storage battery pack according to claim 1, characterized in that: The overflow bin (131) comprises a main board (1312) whose bottom is fixed on the bottom wall (12) and a side board (1313) arranged on the side of the main board (1312), and the side board (1313) is fixed on the inner surface of the mounting wall (13).

3. The liquid-cooled energy storage battery pack according to claim 2, characterized in that: The main board (1312) is constructed to gradually tilt away from the mounting wall (13) in a direction approaching the opening (1311), and the cross-sectional area of ​​the overflow bin (131) gradually decreases in a direction approaching the bottom wall (12).

4. The liquid-cooled energy storage battery pack according to claim 2, characterized in that: The main board (1312) is constructed to gradually incline toward the mounting wall (13) in a direction approaching the opening (1311), and the cross-section of the overflow bin (131) gradually increases in a direction approaching the bottom wall (12).

5. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: The opening (1311) is higher than the top surface of the battery cell and lower than the top surface of the housing (1).

6. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: The length of the opening (1311) is at least three fifths of the length of the accommodating cavity (11).

7. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: A support frame (122) is provided on the inner surface of the bottom wall (12), and the battery cell is placed on the top surface of the support frame (122).

8. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: A liquid distribution pipeline (121) is provided on the inner surface of the bottom wall (12), and the liquid distribution pipeline (121) is connected to the liquid inlet (14).

9. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: The housing (1) is provided with a liquid discharge port (16) which is in communication with the accommodating chamber (11); the liquid discharge port (16) and the liquid inlet (14) are arranged at two ends of the mounting wall (13).

10. The liquid-cooled energy storage battery pack according to any one of claims 1 to 4, characterized in that: The cooling liquid is a non-conductive liquid, and the temperature of the cooling liquid at the upper end of the accommodating cavity (11) is greater than the temperature of the cooling liquid at the lower end of the accommodating cavity (11).

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