Liquid-cooled battery pack and energy storage system

Abstract

The utility model discloses a liquid-cooled battery pack and an energy storage system. The battery pack comprises a bottom plate, a flexible liquid cooling side plate and a corner connecting piece, the bottom plate is used for bearing a battery cell; the flexible liquid cooling side plate is fixedly arranged along the peripheral edge of the bottom plate; the bottom plate and the flexible liquid cooling side plates form an uncovered box body; the flexible liquid cooling side plate is used for fixing the battery cell and dissipating heat for the battery cell; the corner connecting piece is connected to the opening of the flexible liquid cooling side plate; and the corner connecting piece is used for fixing the flexible liquid cooling side plate. According to the embodiment of the utility model, the flexible liquid cooling side plate is used as the side wall of the battery pack, the heat dissipation contact area of the battery cell is increased, and the battery cell is fixed without arranging a strapping tape and an end plate by winding the corner connecting piece around the battery cell; the area of the bottom plate is reduced while the heat dissipation contact area of the battery cells is increased, the heat conduction path of the battery cells is shortened and the relative temperature difference of the battery cells is reduced, so that the heat dissipation efficiency of the battery cells is improved, the service life of the battery cells is prolonged, and the cost of the battery pack is reduced.

Description

Technical Field

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

[0002] Compared with air cooling, liquid cooling system has the characteristics of high heat transfer coefficient, large specific heat capacity, good cooling effect, compact structure and small footprint. Therefore, liquid cooling energy storage system has gradually entered the public's field of vision.

[0003] In the prior art, liquid-cooled energy storage systems generally use a bottom heat dissipation method, where battery cells are placed side by side on a bottom liquid cooling plate. The heat generated by the battery cells during charging and discharging is transferred to the bottom liquid cooling plate through their own heat conduction and then carried away by the coolant.

[0004] However, in the bottom heat dissipation method, the area of ​​the bottom liquid cooling plate is large, and it is necessary to set up a bundle and an end plate belt to fix the battery cell (such as Figure 1 In addition, the heat conduction path of the battery cell is long, the heat dissipation contact area is small, the heat dissipation efficiency of the battery cell is not high, and the relative temperature difference of the battery cell is large. Therefore, in the bottom heat dissipation method, the heat dissipation efficiency and life of the battery cell are low, and the battery pack cost is high. Utility Model Content

[0005] The utility model provides a liquid-cooled battery pack and an energy storage system to improve the heat dissipation efficiency and life of the battery core and reduce the cost of the battery pack.

[0006] According to one aspect of the utility model, a liquid-cooled battery pack is provided, the battery pack comprising:

[0007] A bottom plate, the bottom plate is used to carry the battery cells;

[0008] Flexible liquid-cooled side plates, the flexible liquid-cooled side plates are fixedly arranged along the edges of the bottom plate; the bottom plate and the flexible liquid-cooled side plates form an uncovered box; the flexible liquid-cooled side plates are used to fix the battery core and dissipate heat for the battery core;

[0009] An angle connector, the angle connector is connected to the opening of the flexible liquid-cooled side plate; the angle connector is used to fix the flexible liquid-cooled side plate.

[0010] Optionally, the flexible liquid-cooled side plate comprises: a liquid-cooled plate and a cooling pipe;

[0011] The cooling pipe is laid in an S shape on a side of the flexible liquid-cooling side plate away from the battery core; the cooling pipe is in liquid communication with the flexible liquid-cooling side plate.

[0012] Optionally, the flexible liquid-cooled side panels comprise harmonica tube sheet material.

[0013] Optionally, the base plate comprises a liquid-cooled base plate.

[0014] Optionally, the battery pack further comprises: a sandwich liquid cooling plate;

[0015] The interlayer liquid cooling plate is arranged in the coverless box; the interlayer liquid cooling plate is in liquid communication with the flexible liquid cooling side plate and / or the liquid cooling bottom plate.

[0016] Optionally, the interlayer liquid cooling plate comprises a planar liquid cooling plate;

[0017] The planar liquid cooling plate is arranged parallel to the long side of the bent flexible liquid cooling side plate.

[0018] Optionally, the interlayer liquid cooling plate comprises: an S-shaped liquid cooling plate;

[0019] The S-shaped liquid cooling plate is vertically arranged on the liquid cooling bottom plate; the battery cells are arranged in each opening of the S-shaped liquid cooling plate.

[0020] Optionally, the battery pack further comprises: a liquid-cooled top plate;

[0021] The liquid-cooled top plate is in liquid communication with the flexible liquid-cooled side plate; the liquid-cooled top plate is arranged in parallel with the bottom plate; and the liquid-cooled top plate covers the battery core.

[0022] Optionally, the liquid-cooled top plate is provided with a plurality of battery cell tab openings; the tabs of the battery cell match the battery cell tab openings.

[0023] According to another aspect of the present invention, there is also provided an energy storage system, the system comprising the liquid-cooled battery pack described in any of the above embodiments.

[0024] The embodiment of the utility model uses the flexible liquid-cooled side plate as the side wall of the battery pack, so that the battery cell is wrapped inside the flexible liquid-cooled side plate, so that one of the side surfaces of the battery cell contacts the flexible liquid-cooled side plate, and the side surface of the battery cell in contact with the flexible liquid-cooled side plate becomes the heat dissipation contact surface of the battery cell, thereby increasing the heat dissipation contact area of ​​the battery cell and shortening the heat conduction path. The embodiment of the utility model uses the flexible liquid-cooled side plate as the side wall of the battery pack, and wraps it around the battery cell through an angle connector, without the need to set a strapping tape and an end plate to fix the battery cell, and while increasing the heat dissipation contact area of ​​the battery cell, shortening the heat conduction path of the battery cell, and reducing the relative temperature difference of the battery cell, the area of ​​the bottom plate is reduced, which is beneficial to improving the heat dissipation efficiency and life of the battery cell and reducing the cost of the battery pack.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a schematic diagram of a battery pack of the prior art;

[0028] Figure 2 It is a schematic diagram of a liquid-cooled battery pack loaded with battery cells provided by an embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of a liquid-cooled battery pack without battery cells provided by an embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of a heat conduction path of a battery cell provided by an embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of a harmonica tube plate provided by an embodiment of the utility model;

[0032] Figure 6 It is a schematic diagram of another liquid-cooled battery pack without battery cells provided by an embodiment of the utility model;

[0033] Figure 7 It is a schematic diagram of an S-shaped liquid cooling plate without a battery cell provided by an embodiment of the utility model;

[0034] Figure 8 It is a schematic diagram of an S-shaped liquid cooling plate loaded with battery cells provided by an embodiment of the utility model;

[0035] Fig. 9 It is a schematic diagram of another liquid-cooled battery pack loaded with battery cells provided by an embodiment of the utility model;

[0036] Fig.10 It is a schematic diagram of an energy storage system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] The embodiment of the utility model provides a liquid-cooled battery pack, which can shorten the heat conduction path of the battery cell and improve the heat dissipation efficiency and battery cell life of the battery cell. Figure 2 It is a schematic diagram of a liquid-cooled battery pack loaded with battery cells provided by an embodiment of the utility model. Figure 3 Schematic diagram of a liquid-cooled battery pack without battery cells provided by an embodiment of the present utility model. Figure 2 and Figure 3 The battery pack includes: a bottom plate 110, a flexible liquid-cooled side plate 120 and an angle connector 130.

[0040] The bottom plate 110 is used to carry the battery cell 140; the flexible liquid-cooled side plate 120 is fixedly arranged along the four edges of the bottom plate 110; the bottom plate 110 and the flexible liquid-cooled side plate 120 constitute an uncovered box; the flexible liquid-cooled side plate 120 is used to fix the battery cell 140 and dissipate heat for the battery cell 140; the angle connector 130 is connected to the opening of the flexible liquid-cooled side plate 120; the angle connector 130 is used to fix the flexible liquid-cooled side plate.

[0041] Specifically, the base plate 110 is used to carry the battery 140, that is, the weight of the battery cell 140 is all applied to the base plate 110, so the hardness and strength of the material selected for the base plate 110 are relatively high. The flexible liquid-cooled side plate 120 is used to fix the battery cell 140 on the base plate 110 to prevent the battery cell 140 from being displaced. Therefore, the material of the flexible liquid-cooled side plate 120 is lower in strength than the base plate 110, but has better flexibility than the base plate 110. Therefore, the flexible liquid-cooled side plate 120 can be used in non-standard battery packs. It should be noted that the shape of the battery pack can be set according to the needs of actual application, and this embodiment does not limit this.

[0042] The battery cell 140 is disposed in a coverless box formed by the bottom plate 110 and the flexible liquid-cooled side plate 120. The flexible liquid-cooled side plate 120 wraps the battery cell 140 so that one side of the battery cell 140 contacts the flexible liquid-cooled side plate 120. Since the length of the battery cell 140 in the vertical direction is longer than the width in the horizontal direction, when the battery cell 140 dissipates heat through its side, the heat conduction path of the battery cell 140 is shorter, and the flexible liquid-cooled side plate 120 can fully contact the side of the battery cell 140, the heat dissipation contact area of ​​the battery cell 140 is larger, and the heat dissipation of the battery cell 140 is more balanced. Figure 4 FIG. 1 is a schematic diagram of a heat conduction path of a battery cell provided by an embodiment of the utility model. The heat conduction path of the battery cell 140 is as follows: Figure 4 As shown. The heat conduction path refers to the conduction path required for heat from the heating part of the battery cell 140 to the heat exchange part of the battery cell 140 when the battery cell dissipates heat. It should be noted that the flexible liquid-cooled side plate 120 is filled with a cooling medium to perform heat exchange with the battery 140; the cooling medium can be in liquid or gas form, which is not limited in this embodiment.

[0043] The embodiment of the utility model uses the flexible liquid-cooled side plate 120 as the side wall of the battery pack, so that the battery cell 140 is wrapped inside the flexible liquid-cooled side plate 120, so that one of the side surfaces of the battery cell 140 contacts the flexible liquid-cooled side plate 120, and the side surface of the battery cell 140 in contact with the flexible liquid-cooled side plate 120 becomes the heat dissipation contact surface of the battery cell 140, thereby increasing the heat dissipation contact area of ​​the battery cell 140 and shortening the heat conduction path. The embodiment of the utility model uses the flexible liquid-cooled side plate 120 as the side wall of the battery pack, and wraps around the battery cell 140 through the angle connector 130, without the need to set a strapping tape and an end plate to fix the battery cell 140, and while increasing the heat dissipation contact area of ​​the battery cell 140, shortening the heat conduction path of the battery cell 140, and reducing the relative temperature difference of the battery cell 140, the area of ​​the bottom plate 110 is reduced, which is beneficial to improving the heat dissipation efficiency and life of the battery cell 140 and reducing the cost of the battery pack.

[0044] Based on the above embodiment, optionally, continue to refer to Figure 3 The flexible liquid-cooled side plate 120 includes a liquid-cooled plate 121 and a cooling pipe 122 .

[0045] The cooling pipe 122 is laid in an S shape on the side of the liquid cooling plate 121 away from the battery cell; the cooling pipe 122 is in liquid communication with the liquid cooling plate 121. Specifically, the interior of the liquid cooling plate 121 is in communication with the interior of the cooling pipe 122, so that the cooling medium can flow in the cooling pipe 122 and the liquid cooling plate 121. The laying of the cooling pipe 122 increases the contact area between the flexible liquid cooling side plate 120 and the outside world, thereby improving the heat dissipation efficiency of the cooling medium, thereby improving the cooling efficiency of the battery cell 140.

[0046] Based on the above embodiments, optionally, the flexible liquid-cooled side plate 120 includes a harmonica tube plate material.

[0047] Figure 5 Schematic diagram of a harmonica pipe plate provided by an embodiment of the utility model. Figure 5 Specifically, the harmonica tube sheet has a plurality of pipelines connected in parallel with each other. This structure of the harmonica tube sheet is conducive to the circulation of the cooling medium in the flexible liquid-cooled side plate 120 , thereby improving the heat dissipation efficiency of the battery cell 140 .

[0048] Based on the above embodiments, optionally, the base plate 110 includes a liquid-cooled base plate.

[0049] Figure 6 Schematic diagram of another liquid-cooled battery pack without battery cells provided by the present utility model embodiment. Figure 6 The battery pack also includes: an interlayer liquid cooling plate 150.

[0050] The interlayer liquid cooling plate 150 is disposed in the uncovered box; the interlayer liquid cooling plate 150 is in liquid communication with the flexible liquid cooling side plate 120 and / or the liquid cooling bottom plate.

[0051] Specifically, the provision of the interlayer liquid cooling plate 150 can increase the heat dissipation contact area of ​​the battery cell 140 , so that the battery cell 140 has multiple heat conduction paths, thereby improving the heat dissipation efficiency of the battery cell 140 and facilitating reducing the relative temperature difference of the battery cell 140 .

[0052] Based on the above embodiments, optionally, continue to refer to Figure 6 The interlayer liquid cooling plate 150 includes a planar liquid cooling plate; the planar liquid cooling plate is arranged parallel to the long side of the bent flexible liquid cooling side plate 120 .

[0053] Figure 7 It is a schematic diagram of an S-shaped liquid cooling plate without battery cells provided by an embodiment of the utility model. Figure 8 Schematic diagram of an S-shaped liquid cooling plate loaded with battery cells provided by an embodiment of the utility model. Based on the above embodiments, optionally, in combination with Figure 7 and Figure 8 The interlayer liquid cooling plate 150 includes: an S-shaped liquid cooling plate 151 .

[0054] The S-shaped liquid cooling plate 151 is vertically disposed on the liquid cooling bottom plate; the battery cells 140 are disposed in each opening of the S-shaped liquid cooling plate 151 .

[0055] Fig. 9 Schematic diagram of another liquid-cooled battery pack loaded with battery cells provided by the embodiment of the utility model. Fig. 9 The battery pack also includes: a liquid-cooled top plate 160 .

[0056] The liquid-cooled top plate 160 is in liquid communication with the flexible liquid-cooled side plate 120 ; the liquid-cooled top plate 160 is arranged parallel to the bottom plate 110 ; and the liquid-cooled top plate 160 covers the battery cell 140 .

[0057] Specifically, since the pole ear 141 of the battery cell 140 generates a certain amount of heat when the battery cell 140 is discharged to the outside, causing the temperature of the pole ear 141 to be relatively high, a liquid-cooled top plate 160 is provided to dissipate heat from the pole ear 141 of the battery cell 140, and the provision of the liquid-cooled top plate 160 also further increases the heat dissipation contact area of ​​the battery cell 140, improves the heat dissipation efficiency of the battery cell 140, further reduces the relative temperature difference of the battery cell 140, and increases the life of the battery cell 140.

[0058] Based on the above embodiments, optionally, continue to refer to Fig. 9 The liquid-cooled top plate 160 is provided with a plurality of battery cell tab openings; the tabs 141 of the battery cell 140 match the battery cell tab openings.

[0059] Specifically, the cell tab openings of the liquid-cooled top plate 160 facilitate the connection of the cell 140 with the electrical equipment, and the number of the cell tab openings of the liquid-cooled top plate 160 is consistent with the number of tabs 141 of the cell 140 inside the battery pack, and the aperture of the cell tab openings of the liquid-cooled top plate 160 matches the diameter of the tabs 141 of the cell 140. It should be noted that the shape of the cell tab openings of the liquid-cooled top plate 160 can be circular or square, and the embodiment of the utility model does not limit this.

[0060] Fig.10 Schematic diagram of an energy storage system provided by an embodiment of the utility model. Fig.10 The energy storage system 10 includes the liquid-cooled battery pack 20 provided in any of the above embodiments. The energy storage system 10 provided in the embodiment of the utility model has the beneficial effects of the liquid-cooled battery pack 20 provided in any of the above embodiments, which will not be described in detail here.

[0061] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0062] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A liquid-cooled battery pack, characterized in that: include: A bottom plate, the bottom plate is used to carry the battery cells; Flexible liquid-cooled side plates, the flexible liquid-cooled side plates are fixedly arranged along the edges of the bottom plate; the bottom plate and the flexible liquid-cooled side plates form an uncovered box; the flexible liquid-cooled side plates are used to fix the battery core and dissipate heat for the battery core; An angle connector, the angle connector is connected to the opening of the flexible liquid-cooled side plate; the angle connector is used to fix the flexible liquid-cooled side plate.

2. The liquid-cooled battery pack according to claim 1, characterized in that: The flexible liquid-cooled side plate comprises: a liquid-cooled plate and a cooling pipe; The cooling pipe is laid in an S shape on a side of the flexible liquid-cooling side plate away from the battery core; the cooling pipe is in liquid communication with the flexible liquid-cooling side plate.

3. The liquid-cooled battery pack according to claim 2, characterized in that: The flexible liquid-cooled side panels include harmonica tube panels.

4. The liquid-cooled battery pack according to claim 1, characterized in that: The base plate includes a liquid-cooled base plate.

5. The liquid-cooled battery pack according to claim 4, characterized in that: Also includes: Mezzanine liquid cooling plate; The interlayer liquid cooling plate is arranged in the coverless box; the interlayer liquid cooling plate is in liquid communication with the flexible liquid cooling side plate and / or the liquid cooling bottom plate.

6. The liquid-cooled battery pack according to claim 5, characterized in that: The sandwich liquid cooling plate comprises a planar liquid cooling plate; The planar liquid cooling plate is arranged parallel to the long side of the bent flexible liquid cooling side plate.

7. The liquid-cooled battery pack according to claim 5, characterized in that: The interlayer liquid cooling plate comprises: an S-shaped liquid cooling plate; The S-shaped liquid cooling plate is vertically arranged on the liquid cooling bottom plate; the battery cells are arranged in each opening of the S-shaped liquid cooling plate.

8. The liquid-cooled battery pack according to claim 1, characterized in that: Also includes: Liquid-cooled top plate; The liquid-cooled top plate is in liquid communication with the flexible liquid-cooled side plate; the liquid-cooled top plate is arranged in parallel with the bottom plate; and the liquid-cooled top plate covers the battery core.

9. The liquid-cooled battery pack according to claim 8, characterized in that: The liquid-cooled top plate is provided with a plurality of battery cell tab openings; the tabs of the battery cells match the battery cell tab openings.

10. An energy storage system, characterized in that: Comprising a liquid-cooled battery pack as described in any one of claims 1-9.

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