An immersion battery pack cooling system

Abstract

The present invention discloses an immersed battery pack cooling system, belonging to the field of battery technology, comprising: a battery pack, comprising a battery pack, the battery pack comprising a battery holder and a plurality of single cells arranged side by side on the battery holder, a first heat conducting plate disposed between two adjacent single cells, and at least two first heat conducting pads disposed at intervals on both sides of the first heat conducting plate along the direction in which the multiple single cells are arranged side by side, each first heat conducting pad abutting against the single cell on the corresponding side; a shell, comprising a cavity for accommodating the battery pack and filled with insulating coolant, and a liquid inlet pipe and a liquid outlet pipe connected to the cavity disposed on the shell. The battery pack is entirely immersed in the insulating coolant, and the arrangement of the first heat conducting plate and the first heat conducting pad creates a gap between two adjacent single cells through which the insulating coolant can flow, thereby achieving rapid cooling of the battery pack as a whole and improving the cooling effect of the battery pack.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to an immersed battery pack cooling system. Background Art

[0002] With the development of new energy vehicles, lithium-ion batteries are widely used in automotive power battery packs due to their advantages such as high power, high energy density and long life.

[0003] During the charging and discharging process of lithium-ion batteries, the Joule heat and reaction heat effects of the batteries will generate a large amount of heat. In order to ensure the normal operation of the power battery pack, there are currently two main methods to cool the power battery pack, one is air cooling and the other is indirect liquid cooling. However, when using air cooling, the thermal conductivity of the air is low, the heat exchange capacity between the air and the battery is poor, and the heat dissipation efficiency is low. When using indirect liquid cooling, liquid needs to be passed through the pipes and liquid cooling plates to cool the bottom of the battery pack. In addition, a thermal pad needs to be added between the pipes and liquid cooling plates and the battery pack, so that the thermal resistance is still relatively large. In addition, the battery pack is cooled by heat transfer from bottom to bottom, resulting in uneven overall temperature distribution of the battery, low heat exchange efficiency, and slow cooling speed, which cannot meet the growing needs of users. Summary of the Invention

[0004] The object of the present invention is to provide an immersed battery pack cooling system to improve the cooling uniformity and cooling efficiency of the battery pack and to increase the cooling speed.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] An immersion battery pack cooling system, comprising:

[0007] A battery pack, comprising a battery pack, the battery pack comprising a battery holder and a plurality of single cells arranged side by side on the battery holder, a first heat conducting plate disposed between two adjacent single cells, and at least two first heat conducting pads disposed at intervals on both sides of the first heat conducting plate along a direction in which the multiple single cells are arranged side by side, each first heat conducting pad abutting against the single cell on the corresponding side;

[0008] The shell has a cavity for accommodating the battery pack and filled with insulating coolant, and the shell is provided with a liquid inlet pipe and a liquid outlet pipe communicating with the cavity.

[0009] Furthermore, the battery pack is provided with at least two, a second heat conducting plate is provided between two adjacent battery packs, and the second heat conducting plate is provided with at least two spaced second heat conducting pads on both sides facing the two battery packs respectively, and each second heat conducting pad abuts the battery pack on the corresponding side.

[0010] Furthermore, the battery holder includes a base and a top cover, the base has a space for accommodating a plurality of the single cells, the top cover is arranged on the base, and the top cover is provided with a pressure plate corresponding to each of the single cells, and each of the pressure plates presses against the corresponding single cell.

[0011] Furthermore, the top cover includes a frame and a crossbeam, the frame is connected to the base, the crossbeam is connected between two opposite side walls of the frame in the arrangement direction of the plurality of single cells, and the pressure plate is provided on the crossbeam.

[0012] Furthermore, the base includes a bottom hollow plate and a plurality of side hollow plates arranged around the bottom hollow plate, the bottom hollow plate and the side hollow plates are arranged to form the space, the single battery is supported on the bottom hollow plate, and the top cover is connected to the plurality of side hollow plates.

[0013] Furthermore, the base further comprises a plurality of side fixing plates, and at least one side fixing plate is detachably provided on a side of each of the side hollow plates facing away from the space.

[0014] Furthermore, the bottom hollow plate and the plurality of side hollow plates are integrally formed.

[0015] Furthermore, the base is provided with a plurality of fixing ears extending outward, each of the fixing ears is provided with a fixing hole, and a fastener passes through the fixing hole to be connected to the shell.

[0016] Furthermore, in the height direction of the single battery, the height of the first heat conducting plate is greater than the height of the single battery.

[0017] Furthermore, the immersed battery pack cooling system further includes a shell bracket, which is disposed in the cavity of the shell.

[0018] The beneficial effects of the present invention are:

[0019] The immersed battery pack cooling system proposed in this invention immerses the entire battery pack in insulating coolant. The arrangement of the first heat-conducting plate and the first thermal pad not only allows multiple battery cells to be tightly arranged in rows, but also creates spaces between adjacent battery cells, allowing the insulating coolant to flow through these spaces. This rapidly cools the entire battery pack and improves its cooling efficiency. Furthermore, the first heat-conducting plate isolates heat from a single battery cell if it experiences thermal runaway, allowing the heat to dissipate through the first heat-conducting plate and the insulating coolant, preventing heat transfer to other batteries and potentially causing runaway of the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the immersed battery pack cooling system provided by the present invention;

[0021] Figure 2 1 is a schematic diagram of disassembly of the battery pack provided by the present invention;

[0022] Figure 3 yes Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0023] Figure 4 Schematic diagram of the structure of the battery pack provided by the present invention;

[0024] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point B in the middle.

[0025] In the picture:

[0026] 1. Battery pack; 10. Battery pack; 11. Base; 111. Bottom hollow plate; 1111. Fixing ears; 112. Side hollow plate; 113. Side fixing plate; 12. Top cover; 121. Frame; 122. Crossbeam; 123. Press plate; 13. Single battery cell; 14. First thermal conductive plate; 141. First thermal pad;

[0027] 2. Shell; 21. Liquid inlet pipe; 22. Liquid outlet pipe;

[0028] 3. Second heat conducting plate; 31. Second heat conducting pad. DETAILED DESCRIPTION

[0029] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0030] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] like Figures 1 to 5 As shown, this embodiment provides an immersed battery pack cooling system, which includes a battery pack 1 and a housing 2. The battery pack 1 includes a battery pack 10, which includes a battery holder and multiple single cells 13 arranged side by side in the battery holder. A first heat conducting plate 14 is disposed between two adjacent single cells 13. The first heat conducting plate 14 is provided with at least two spaced-apart first heat conducting pads 141 on both sides of the first heat conducting plate 14 along the direction in which the multiple single cells 13 are arranged side by side. Each first heat conducting pad 141 abuts against the single cell 13 on the corresponding side. The housing 2 has a cavity that accommodates the battery pack 1 and is filled with insulating coolant. The housing 2 is provided with a liquid inlet pipe 21 and a liquid outlet pipe 22 that communicate with the cavity.

[0034] It is understood that the entire battery pack 1 is immersed in the insulating coolant, and the provision of the first heat conducting plate 14 and the first thermal pad 141 not only allows the multiple battery cells 13 to be closely arranged in rows, but also creates gaps between adjacent battery cells 13, allowing the insulating coolant to flow through the gaps between the two adjacent battery cells 13, thereby achieving rapid cooling of the entire battery pack 1 and improving the cooling effect of the battery pack 1. Furthermore, the provision of the first heat conducting plate 14 can block the heat of one battery cell 13 if thermal runaway occurs, allowing the heat to dissipate through the first heat conducting plate 14 and the insulating coolant, preventing heat transfer to other battery cells 13 and causing runaway of the entire battery pack 1.

[0035] Furthermore, in this embodiment, the height of the first heat conducting plate 14 is greater than that of the single battery 13. With this arrangement, if a single battery 13 experiences thermal runaway, the first heat conducting plate 14 can enhance the flame retardant effect between two adjacent single batteries 13, thereby improving the safety performance of the immersed battery pack cooling system.

[0036] Furthermore, the battery pack 10 is provided with at least one. Specifically, in the present embodiment, two battery packs 10 are provided, and a second heat conducting plate 3 is provided between the two adjacent battery packs 10, and the second heat conducting plate 3 is provided with at least two spaced second heat conducting pads 31 on both sides facing the two battery packs 10, each second heat conducting pad 31 abuts against the battery pack 10 on the corresponding side. By providing the second heat conducting plate 3 and the second heat conducting pad 31, a gap for the insulating coolant to flow through can be formed between the two adjacent battery packs 10, which is beneficial to the rapid cooling of the two battery packs 10. Of course, in other embodiments, one or more battery packs 10 can be provided, and when there is only one battery pack 10, the second heat conducting plate 3 and the second heat conducting pad 31 can be omitted.

[0037] It should be noted that, in this embodiment, the first heat conducting plate 14 and the second heat conducting plate 3 are preferably aluminum plates. Of course, in other embodiments, the first heat conducting plate 14 and the second heat conducting plate 3 may also be plate structures made of other materials.

[0038] like Figures 2 to 5 As shown, the battery holder includes a base 11 and a top cover 12. The base 11 has a space for accommodating multiple single cells 13. The top cover 12 is mounted on the base 11. The top cover 12 is provided with a pressure plate 123 corresponding to each single cell 13. Each pressure plate 123 presses against the corresponding single cell 13. The pressure plates 123 can restrain each single cell 13 between the pressure plate 123 and the base 11, preventing the single cell 13 from shifting when subjected to vibration.

[0039] The base 11 comprises a bottom hollow plate 111 and multiple side hollow plates 112 arranged around the bottom hollow plate 111. The bottom hollow plate 111 and the multiple side hollow plates 112 enclose a space to accommodate multiple battery cells 13. The battery cells 13 are supported by the bottom hollow plate 111, and the top cover 12 is connected to the multiple side hollow plates 112. The provision of the bottom hollow plate 111 and the side hollow plates 112 not only helps reduce the weight of the battery holder but also allows the insulating coolant to directly contact the battery cells 13, improving the cooling efficiency of the battery cells 13. Specifically, in this embodiment, the bottom hollow plate 111 is a quadrilateral structure, and four corresponding side hollow plates 112 are provided.

[0040] It should be noted that, in order to reduce the number of parts and assembly time, in this embodiment, the bottom hollow plate 111 and the multiple side hollow plates 112 constituting the base 11 are integrally formed. Of course, in other embodiments, the bottom hollow plate 111 and the multiple side hollow plates 112 can also be formed separately and fixedly connected by bolts or welding.

[0041] Furthermore, to facilitate installation of the battery holder, a plurality of fixing ears 1111 are provided extending outward from the base 11. The fixing ears 1111 are provided with fixing holes. Fasteners pass through the fixing holes and are connected to the housing 2, thereby connecting the base 11 and the housing 2. Specifically, the fasteners are preferably bolts. In this case, the battery holder is detachably mounted to the housing 2, facilitating installation and removal of the battery pack 10.

[0042] Furthermore, the base 11 includes multiple side fixing plates 113. Each side hollow plate 112 is detachably provided with at least one side fixing plate 113 on the side facing away from the aforementioned space. Specifically, in this embodiment, each side hollow plate 112 is provided with a side fixing plate 113 on the side facing away from the aforementioned space. The side fixing plates 113 extend along the parallel arrangement of the multiple battery cells 13 or along the width of the battery cells 13. The provision of the side fixing plates 113 enhances the structural strength of the battery holder.

[0043] The top cover 12 includes a frame 121 and a crossbeam 122. The frame 121 is connected to the multiple side hollow plates 112 of the base 11. The crossbeam 122 is connected between two opposing side walls of the frame 121 in the direction in which the multiple battery cells 13 are arranged. A pressure plate 123 is provided on the crossbeam 122 corresponding to each battery cell 13. Specifically, in this embodiment, there is one crossbeam 122. Of course, in other embodiments, there may be two or more crossbeams 122, and each crossbeam 122 is provided with a pressure plate 123 corresponding to each battery cell 13.

[0044] The immersed battery pack cooling system provided in this embodiment further includes a housing bracket disposed within the cavity of the housing 2. Specifically, the housing bracket is mounted on the housing 2. The provision of the housing bracket not only enhances the structural strength of the housing 2 but also increases the turbulence of the insulating coolant within the cavity, thereby improving the heat exchange efficiency between the insulating coolant and the single battery cells 13, thereby enhancing the cooling efficiency of the battery pack 1.

[0045] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An immersion battery pack cooling system, characterized in that: include: A battery pack (1) comprises a battery group (10), wherein the battery group (10) comprises a battery holder and a plurality of single cells (13) arranged side by side on the battery holder, a first heat conducting plate (14) is arranged between two adjacent single cells (13), and the first heat conducting plate (14) is provided with at least two first heat conducting pads (141) arranged at intervals on both sides along the direction in which the plurality of single cells (13) are arranged side by side, and each first heat conducting pad (141) abuts against the single cell (13) on the corresponding side; A housing (2) having a cavity for accommodating the battery pack (1) and filled with insulating coolant, and a liquid inlet pipe (21) and a liquid outlet pipe (22) communicating with the cavity are provided on the housing (2); The battery pack (1) is entirely immersed in the insulating coolant, and the insulating coolant is able to flow through a gap formed between two adjacent single batteries (13); In the height direction of the single battery (13), the height of the first heat conducting plate (14) is greater than the height of the single battery (13).

2. The immersed battery pack cooling system according to claim 1, characterized in that: The battery packs (10) are provided with at least two, a second heat conducting plate (3) is provided between two adjacent battery packs (10), and the second heat conducting plate (3) is provided with at least two spaced second heat conducting pads (31) on both sides facing the two battery packs (10), each second heat conducting pad (31) abuts against the battery pack (10) on the corresponding side.

3. The immersed battery pack cooling system according to claim 1, characterized in that: The battery holder comprises a base (11) and a top cover (12); the base (11) has a space for accommodating a plurality of single batteries (13); the top cover (12) is arranged on the base (11); and the top cover (12) is provided with a pressure plate (123) corresponding to each single battery (13); each pressure plate (123) presses against the corresponding single battery (13).

4. The immersed battery pack cooling system according to claim 3, characterized in that: The top cover (12) comprises a frame (121) and a crossbeam (122); the frame (121) is connected to the base (11); the crossbeam (122) is connected between two opposite side walls of the frame (121) in the arrangement direction of the plurality of single batteries (13); and the pressure plate (123) is provided on the crossbeam (122).

5. The immersed battery pack cooling system according to claim 3, characterized in that: The base (11) comprises a bottom hollow plate (111) and a plurality of side hollow plates (112) arranged around the bottom hollow plate (111); the bottom hollow plate (111) and the side hollow plates (112) are arranged to form the space; the single battery (13) is supported on the bottom hollow plate (111); and the top cover (12) is connected to the plurality of side hollow plates (112).

6. The immersed battery pack cooling system according to claim 5, characterized in that: The base (11) further comprises a plurality of side fixing plates (113), and at least one side fixing plate (113) is detachably provided on a side of each side hollow plate (112) facing away from the space.

7. The immersed battery pack cooling system according to claim 5, characterized in that: The bottom hollow plate (111) and the plurality of side hollow plates (112) are integrally formed.

8. The immersed battery pack cooling system according to claim 3, characterized in that: The base (11) is provided with a plurality of fixing ears (1111) extending outwards, each fixing ear (1111) is provided with a fixing hole, and a fastener passes through the fixing hole to be connected to the housing (2).

9. The immersed battery pack cooling system according to claim 1, characterized in that: The immersed battery pack cooling system further comprises a shell bracket, which is arranged in the cavity of the shell (2).

Images