Battery PACK

Abstract

The utility model discloses a battery PACK, and relates to the technical field of power batteries. The battery PACK comprises a battery box, a plurality of battery modules and a heat-conducting gel layer. The battery box comprises a cover body and a liquid cooling plate, the cover body and the liquid cooling plate are buckled with each other in a first direction to form an accommodating space, and a liquid cooling pipeline and a liquid cooling interface communicated with the liquid cooling pipeline are further laid on the liquid cooling plate; the plurality of battery modules are arranged in the accommodating space at intervals along a second direction, and are attached to the liquid cooling plate along the bottom of the first direction; and the heat-conducting gel layer is coated on one side, facing the battery modules, of the liquid cooling plate along the first direction and is used for bonding the plurality of battery modules and the liquid cooling plate. By adopting the technology provided by the utility model, the liquid leakage risk of the liquid cooling plate can be reduced while the connection stability can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery PACK. Background Art

[0002] Battery PACK refers to a battery pack, which is composed of multiple battery units (or cells) connected in series or parallel to provide the required voltage and capacity. It is widely used in electric vehicles, energy storage systems, portable electronic devices and other fields.

[0003] Because battery packs are prone to overheating during operation, thermal management is required. Currently, three cooling systems are used for active cooling: air cooling, liquid cooling, and direct refrigerant cooling. However, air cooling systems have poor water and dust resistance, which can easily damage internal electronic components. Direct refrigerant cooling systems have poor temperature uniformity, resulting in large temperature differences between different battery modules. Mainstream liquid cooling systems use liquid cooling pipes that are in direct contact with the battery module assembly, which can easily cause temperature unevenness between battery modules and pose a high risk of leakage. Utility Model Content

[0004] The utility model provides a battery PACK to solve the problems in the prior art of a high risk of leakage and uneven cooling of liquid cooling pipes in a battery PACK.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a battery PACK, which includes: a battery box, multiple battery modules and a thermally conductive gel layer.

[0006] The battery box includes a cover and a liquid cooling plate, and the cover and the liquid cooling plate are buckled together along a first direction to form an accommodating space, wherein the liquid cooling plate is also provided with a liquid cooling pipe and a liquid cooling interface connected to the liquid cooling pipe; the plurality of battery modules are arranged in the accommodating space at intervals along the second direction and are attached to the liquid cooling plate at the bottom along the first direction; the thermal conductive gel layer is applied to the side of the liquid cooling plate facing the battery module along the first direction, and is used to bond the plurality of battery modules and the liquid cooling plate.

[0007] The technical solution provided by this utility model has the following beneficial effects compared with the prior art:

[0008] By interlocking the liquid cooling plate and cover, the multiple battery modules within the system are positioned close to the plate for rapid heat dissipation while maintaining the structural stability of the battery pack. The plate's built-in cooling pipes flow coolant, acting as a heat transfer medium. Coolant flows in and out through the cooling ports, achieving thermal management of the battery modules.

[0009] Among them, a thermal conductive gel layer is also provided between the battery module and the liquid cooling plate, which can not only adhere the battery module and fix the battery module to a certain extent, but also improve the heat exchange effect between the battery module and the liquid cooling plate to increase the heat dissipation efficiency.

[0010] In some embodiments, the liquid cooling plate is further provided with limit bars on both sides along the third direction, wherein the battery module is provided with end plates on both sides along the third direction, and the end plates are connected to the limit bars along the first direction.

[0011] Using this technical solution, the end plate provides the necessary mechanical support for the battery module and connects to the limit bars of the liquid cooling plate to enhance the connection stability between the battery modules. Furthermore, screws are provided on both sides of the end plate along the third direction, and the screws sequentially penetrate the end plate and the limit bars along the first direction.

[0012] In some embodiments, the outer edge of the liquid cooling plate is further provided with a plurality of locking holes, and the plurality of locking holes are used to lock with the cover body.

[0013] With the above technical solution, the cover is fastened to the liquid cooling plate through the lock hole, wherein a pressure strip is provided between the liquid cooling plate and the cover to absorb shock and vibration, thereby providing a buffering effect for the cover and the liquid cooling plate.

[0014] In some embodiments, the battery PACK is further provided with an electrical plate, which is electrically connected to the plurality of battery modules respectively, wherein the liquid cooling interface is located along the third direction on a side of the electrical plate away from the battery module.

[0015] By adopting the above technical solution, electronic components interconnected with the battery module are provided on the electrical board, and the liquid cooling interface is set on the side away from the electrical board to ensure the electrical safety of the electrical board and prevent electrical short circuits caused by coolant leakage.

[0016] In some embodiments, the liquid cooling plate is further provided with a plurality of spacers, and the electrical plate is located on top of the spacers along the first direction.

[0017] By adopting the above technical solution, a spacer is added to avoid direct contact between the electrical board and the liquid cooling plate, so that when leakage occurs, the electrical board can be isolated to avoid damage.

[0018] In some embodiments, the battery module includes a plurality of battery cells spaced apart along a third direction, wherein an aerosol layer is provided between two adjacent battery cells.

[0019] With the above technical solution, the aerosol layer can use phase change materials, which can absorb and release heat during the battery charging and discharging process, thereby jointly regulating the battery temperature with the liquid cooling plate to prevent the battery cells from overheating. Among them, the aerosol layer can also serve as a shock-absorbing structure between two adjacent battery cells to reduce the relative movement of the battery cells during the battery PACK transportation process.

[0020] In some embodiments, the battery module further includes a steel belt, which is sleeved outside the plurality of battery cells and tightens the battery cells.

[0021] By adopting the above technical solution, steel belts are added to provide additional structural support for the battery module, thereby enhancing the mechanical strength and rigidity of the battery module.

[0022] In some embodiments, the battery PACK further includes a plurality of insulating strips, which are inserted along the first direction and located on the bottom side of the battery module, and extend along the third direction to abut against the limiting strips.

[0023] Using the above technical solution, the insulating strip is made of polycarbonate material, which has good stamping resistance and heat resistance. It is placed between the bottom of the battery module and the adjacent liquid cooling plate and isolated to provide necessary insulation protection.

[0024] In some embodiments, the battery PACK is further provided with a plurality of injection isolation plates, and the injection isolation plates are located between the cover and the battery module along the first direction.

[0025] By adopting the above technical solution, the spray isolation plate has good thermal insulation effect and flame retardant properties, which can effectively prevent the spread of faults to a wider range when the battery PACK experiences thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of a battery pack provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the three-dimensional structure of an embodiment of a battery pack provided by the present invention;

[0029] Figure 3This is a side view of the internal structure of an embodiment of a battery pack provided by the present invention;

[0030] Figure 4 This is a partial structural diagram of the back side of a liquid cooling plate of a battery pack provided by the present invention;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of an embodiment of the front side of a liquid cooling plate of a battery pack provided by the present invention;

[0032] Figure 6 It is a three-dimensional structural diagram of an embodiment of a battery module of a battery pack provided by the present invention.

[0033] In the picture:

[0034] 10. Battery box; 11. Cover; 12. Liquid cooling plate; 121. Liquid cooling interface; 122. Limiting strip; 123. Lock hole; 124. Pressure strip; 125. Pad; 126. Reinforcement sheet; 13. Accommodation space; 20. Battery module; 21. End plate; 210. Screw; 22. Battery cell; 23. Aerosol layer; 24. Steel strip; 25. Insulation strip; 30. Thermal conductive gel layer; 40. Electrical board; 50. Spray isolation board. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In order to facilitate the subsequent description, before describing the specific structure of the battery PACK, this application first combines Figure 2 A first direction (Z), a second direction (Y), and a third direction (X) are defined. The first direction is the height of the battery pack when it is normally placed, such as the Z direction; the second direction is the width of the battery pack when it is normally placed, such as the Y direction; and the third direction is the width of the battery pack when it is normally placed, such as the X direction. In this application, the first direction (Z), the second direction (Y), and the third direction (X) are perpendicular to each other.

[0037] It can be understood that the mutual perpendicularity in this application is not absolute perpendicularity. Approximate perpendicularity caused by processing errors and assembly errors (for example, the angle between two structural features is 89.9°) is also within the range of mutual perpendicularity in this application.

[0038] See also Figures 1 to 3 As shown, Figure 1 A schematic diagram of an exploded structure of a battery pack according to an embodiment of the present application is shown; Figure 2 A schematic diagram of the three-dimensional structure of an embodiment of a battery pack provided by the present application is shown; Figure 3 A side view of the internal structure of an embodiment of a battery PACK provided by the present application is shown.

[0039] In some embodiments, the battery PACK includes a battery box 10 , a plurality of battery modules 20 , and a thermally conductive gel layer 30 .

[0040] The battery box 10 includes a cover 11 and a liquid cooling plate 12, which are interlocked along a first direction to form an accommodating space 13, wherein the liquid cooling plate 12 is also provided with a liquid cooling pipe and a liquid cooling interface 121 connected to the liquid cooling pipe; multiple battery modules 20 are arranged in the accommodating space 13 at intervals along the second direction and are attached to the liquid cooling plate 12 at the bottom along the first direction; a thermal conductive gel layer 30 is applied to the side of the liquid cooling plate 12 facing the battery module 20 along the first direction, and is used to bond the multiple battery modules 20 and the liquid cooling plate 12.

[0041] In this embodiment of the present application, by interlocking the liquid cooling plate 12 and the cover 11, the multiple battery modules 20 located in the accommodating space 13 are brought into close proximity with the liquid cooling plate 12, rapidly dissipating heat while maintaining the structural stability of the battery pack. The liquid cooling pipes within the liquid cooling plate 12 flow a coolant (e.g., cooling water) as a heat transfer medium, and the coolant flows in and out through the liquid cooling port 121 to achieve thermal management of the battery modules 20.

[0042] For example, the battery pack also includes an electrical board 40, which is electrically connected to each of the multiple battery modules 20. The cover 11 is provided with a corresponding groove shaped to match the electrical board 40. This allows the electrical board 40 to be located outside the battery box 10 when the cover 11 is engaged with the liquid cooling plate 12, facilitating easy access. The liquid cooling port 121 is located along the third direction on the side of the electrical board 40 away from the battery modules 20. This means that the liquid cooling port 121 is located outside the battery box 10, reducing the risk of coolant leakage.

[0043] Among them, a thermally conductive gel layer 30 is also provided between the battery module 20 and the liquid cooling plate 12, which can not only adhere the battery module 20 and fix the battery module 20 to a certain extent, but also improve the heat exchange effect between the battery module 20 and the liquid cooling plate 12 to increase the heat dissipation efficiency.

[0044] In some embodiments, the battery pack is further provided with a plurality of injection isolation plates 50 , and the injection isolation plates 50 are located between the cover 11 and the battery module 20 along the first direction.

[0045] In this embodiment of the present application, the spray-on isolation plate 50 provides excellent thermal insulation and flame retardancy, effectively preventing the spread of a wider range of faults when a battery pack experiences thermal runaway. For example, multiple spray-on isolation plates 50 are provided, corresponding one to one with the number of battery modules 20, and are positioned over the battery modules 20.

[0046] See also Figures 4 and 5 As shown, Figure 4 A partial structural schematic diagram of the back side of a liquid cooling plate 12 of a battery pack provided by the present application is shown; Figure 5 A schematic three-dimensional structure diagram of the front side of a liquid cooling plate 12 of a battery PACK provided in the present application is shown.

[0047] In some embodiments, the outer edge of the liquid cooling plate 12 is provided with a plurality of locking holes 123 for locking with the cover 11. The cover 11 is fastened to the liquid cooling plate 12 through the locking holes 123. A pressure strip 124 is further provided between the liquid cooling plate 12 and the cover 11 to absorb shock and vibration, providing a cushioning effect for the cover 11 and the liquid cooling plate 12.

[0048] In some embodiments, the liquid cooling plate 12 is further provided with a plurality of spacers 125, and the electrical board 40 is located on top of the spacers 125 along the first direction. Figure 3 As shown, a spacer 125 is added to prevent direct contact between the electrical board 40 and the liquid cooling plate 12, so that when liquid leakage occurs, the electrical board 40 can also be isolated to avoid damage.

[0049] For example, in combination Figure 5 As shown, the liquid cooling plate 12 is further provided with a plurality of reinforcing plates 126 extending along the second direction, which are arranged at intervals along the third direction to enhance the structural stability of the liquid cooling plate 12 .

[0050] See also Figure 6 As shown, Figure 6 FIG2 shows a schematic three-dimensional structure diagram of a battery module 20 of a battery pack provided in the present application.

[0051] In some embodiments, combined Figure 3 、 Figure 4 and Figure 6 As shown, the liquid cooling plate 12 is further provided with limiting bars 122 on both sides along the third direction, wherein the battery module 20 is provided with end plates 21 on both sides along the third direction, and the end plates 21 are connected to the limiting bars 122 along the first direction.

[0052] In this embodiment of the present application, the end plate 21 provides the necessary mechanical support for the battery module 20 and is connected to the limiting bars 122 of the liquid cooling plate 12 to enhance the connection stability between the battery modules 20. Furthermore, screws 210 are provided on both sides of the end plate 21 along the third direction. The screws 210 sequentially penetrate the end plate 21 and the limiting bars 122 along the first direction.

[0053] In some embodiments, the battery module 20 includes a plurality of battery cells 22 spaced apart along a third direction, wherein an aerosol layer 23 is provided between two adjacent battery cells 22 .

[0054] In an embodiment of the present application, the aerosol layer 23 can be made of phase change material, so that it can absorb and release heat during the battery charging and discharging process, thereby jointly regulating the battery temperature with the liquid cooling plate 12 to prevent the battery cells 22 from overheating. The aerosol layer 23 can also serve as a shock-absorbing structure between two adjacent battery cells 22 to reduce the relative movement of the battery cells 22 during the battery PACK transportation process.

[0055] In some embodiments, the battery module 20 further includes a steel belt 24 , which is sleeved around the plurality of battery cells 22 and tightens the battery cells 22 .

[0056] In the embodiment of the present application, a steel band 24 is added to provide additional structural support for the battery module 20, thereby enhancing the mechanical strength and rigidity of the battery module 20. For example, the steel band 24 is sleeved around the outer ring of the battery module 20 to clamp the multiple battery cells 22 and the end plates 21 located on both sides of the battery cells 22.

[0057] In some embodiments, the battery PACK further includes a plurality of insulating strips 25 , which are inserted into the bottom side of the battery module 20 along a first direction and extend along a third direction to abut against the limiting strips 122 .

[0058] In the embodiment of the present application, the insulating strip 25 is made of polycarbonate material, which has good stamping resistance and heat resistance. It is placed between the bottom of the battery module 20 and the adjacent liquid cooling plate 12 and isolated to provide necessary insulation protection.

[0059] The above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A battery box, the battery box comprising a cover and a liquid cooling plate, the cover and the liquid cooling plate being engaged with each other along a first direction to form an accommodating space, wherein the liquid cooling plate is further provided with a liquid cooling pipe and a liquid cooling interface communicating with the liquid cooling pipe; a plurality of battery modules, the plurality of battery modules being spaced apart in the accommodating space along the second direction and being in contact with the liquid cooling plate at the bottom along the first direction; A thermally conductive gel layer is applied along the first direction to a side of the liquid cooling plate facing the battery module and is used to bond the plurality of battery modules to the liquid cooling plate.

2. The battery pack according to claim 1, characterized in that: The liquid cooling plate is further provided with limiting bars on both sides along the third direction, wherein the battery module is provided with end plates on both sides along the third direction, and the end plates are connected to the limiting bars along the first direction.

3. The battery pack according to claim 2, characterized in that: Screws are further provided on both sides of the end plate along the third direction, and the screws sequentially penetrate the end plate and the limiting strip along the first direction.

4. The battery pack according to claim 1, characterized in that: The outer edge of the liquid cooling plate is further provided with a plurality of locking holes, and the plurality of locking holes are used to be locked with the cover body.

5. The battery pack according to claim 1, characterized in that: The battery PACK is further provided with an electrical board, which is electrically connected to the plurality of battery modules respectively, wherein the liquid cooling interface is located along the third direction on a side of the electrical board away from the battery modules.

6. The battery pack according to claim 5, characterized in that: The liquid cooling plate is further provided with a plurality of pads, and the electrical plate is located on top of the pads along the first direction.

7. The battery pack according to claim 1, characterized in that: The battery module includes a plurality of battery cells spaced apart along a third direction, wherein an aerosol layer is provided between two adjacent battery cells.

8. The battery pack according to claim 7, characterized in that: The battery module further includes a steel belt, which is sleeved outside the plurality of battery cells and tightens the battery cells.

9. The battery pack according to claim 1, characterized in that: The battery pack further includes a plurality of insulating strips, which are inserted along the first direction and located on the bottom side of the battery module, and extend along the third direction to abut against the limiting strips.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The battery pack is further provided with a plurality of injection isolation plates, and the injection isolation plates are located between the cover and the battery module along the first direction.

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