Energy storage battery pack shell, energy storage battery pack and energy storage cabinet

Abstract

The utility model discloses an energy storage battery pack shell which comprises a shell body, the shell body comprises an upper shell body, a frame and a lower shell body, the upper shell body, the frame and the lower shell body define a sealed containing cavity, the lower shell body is a heat exchange plate, the heat exchange plate is connected with the frame in a welded mode to form a first connecting part and a second connecting part, and the first connecting part and the second connecting part are connected with the frame in a welded mode. The first connecting part is located on a connecting gap, facing the outer side of the shell, between the frame and the heat exchange plate, a boss part is arranged on the surface of the side, facing the frame, of the heat exchange plate, and the circumferential outer side face of the boss part abuts against the circumferential inner side face of the frame. The second connecting part is located at the circumferential connecting position of the frame and the boss part. In addition, the utility model also discloses an energy storage battery pack and an energy storage cabinet. The first connecting part and the second connecting part are arranged on the inner side and the outer side of the connecting position of the frame and the heat exchange plate respectively, so that the connecting strength and the sealing performance of the frame and the heat exchange plate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, and in particular to an energy storage battery pack shell, an energy storage battery pack and an energy storage cabinet. Background Art

[0002] Energy storage battery packs are energy storage devices that manage battery temperature through a cooling system. Due to their high energy density, high voltage, environmental protection, long life, and fast charging, they are widely used in industries such as 3C digital, power tools, electric bicycles, grid energy storage, and new energy vehicles.

[0003] Energy storage battery packs usually need to be hoisted in energy storage mechanisms for use, and battery cells and coolant are installed in the sealed cavity of the immersion liquid-cooled energy storage battery pack. The frame and the lower shell of the energy storage battery pack in the prior art usually adopt a threaded connection. Since the lower shell of the energy storage battery pack needs to bear the weight and pressure of the battery cells and coolant, the energy storage battery pack in the prior art will be damaged due to insufficient connection strength and sealing strength between the lower shell and the frame.

[0004] Therefore, it is very necessary to design an energy storage battery pack shell, an energy storage battery pack and an energy storage cabinet with simple structure and high connection strength. Utility Model Content

[0005] In order to solve one of the above-mentioned defects of the prior art, the present application provides an energy storage battery pack shell, an energy storage battery pack and an energy storage cabinet, which can improve the connection strength and sealing performance between the frame and the lower shell.

[0006] In the first aspect, in order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0007] A shell of an energy storage battery pack includes a shell body, which includes an upper shell, a frame and a lower shell. The upper shell, the frame and the lower shell form a sealed cavity. The lower shell is configured as a heat exchange plate. The heat exchange plate is welded to the frame and is formed with a first connection portion and a second connection portion. The first connection portion is located in the connection gap between the frame and the heat exchange plate toward the outside of the shell. A boss portion is provided on the surface of the heat exchange plate facing the frame. The circumferential outer side surface of the boss portion abuts against the circumferential inner side surface of the frame. The second connection portion is located at the circumferential connection between the frame and the boss portion.

[0008] In the present technical solution, the first connection portion and the second connection portion are formed by welding the heat exchange plate and the frame, thereby strengthening the connection strength between the frame and the heat exchange plate and the sealing of the sealed cavity. By providing a boss portion facing the side of the frame on the heat exchange plate and making the boss portion abut against the frame, the connection strength and sealing performance between the frame and the heat exchange plate are further improved.

[0009] Preferably, a height difference is formed between the first and second connecting portions, and the height difference is the same as the height of the boss portion. By arranging the first and second connecting portions at different heights, the first and second connecting portions are staggered, and the gap between the first and second connecting portions is increased in length while being reduced in width, further improving the connection strength and sealing performance between the frame and the heat exchange plate.

[0010] Preferably, the first connecting portion forms a closed ring at the circumferential connection between the frame and the heat exchange plate. The first connecting portion is configured as a closed ring to improve connection strength and sealing.

[0011] Preferably, the second connecting portion forms a closed ring at the circumferential connection between the frame and the boss portion. The second connecting portion is also configured as a closed ring to improve connection strength and sealing performance.

[0012] Preferably, a liquid circulation channel is formed inside the heat exchange plate, and a liquid inlet and a liquid outlet communicating with the liquid circulation channel are provided on the heat exchange plate, the liquid inlet and the liquid outlet being both located outside the sealed cavity. A cooling medium is provided in the liquid circulation channel, and the cooling liquid is injected into the liquid circulation channel from the liquid inlet and discharged from the liquid circulation channel through the liquid outlet. By providing the liquid circulation channel and disposing the cooling medium in the channel, the heat exchange capacity of the heat exchange plate is improved.

[0013] Preferably, a mounting groove for mounting the battery cell is provided on the top surface of the boss portion. By providing the mounting groove on the top surface of the boss portion of the heat exchange plate, the mounting stability between the battery pack housing and the battery cell is improved.

[0014] Preferably, the upper shell and the frame are provided with a detachable sealed connection. The detachable connection between the upper shell and the frame facilitates opening the shell body and forming a second connection portion between the lower shell and the frame before connecting the upper shell and the frame to form a sealed cavity.

[0015] Preferably, the heat exchange plate is further provided with mounting holes, through which the housing body is fixedly connected to the external connector. Providing mounting holes on the heat exchange plate for mounting the battery pack reduces the load-bearing capacity of the upper housing and frame, and reduces the stress on the first and second connecting parts.

[0016] Secondly, to achieve the above-mentioned objectives, the present application further provides an energy storage battery pack, comprising a housing and battery cells located within the housing, wherein the housing is configured as any of the above-mentioned energy storage battery pack housings. The reasoning behind the beneficial effects of the energy storage battery pack and the energy storage battery pack housing provided herein is similar and will not be further elaborated here.

[0017] Thirdly, to achieve the above-mentioned objectives, the present application further provides an energy storage cabinet, comprising a cabinet and a plurality of energy storage units located within the cabinet. The energy storage units are formed by a plurality of energy storage battery packs connected in series and / or in parallel, and the energy storage battery packs are configured as described above. The reasoning process for the beneficial effects of the energy storage cabinet and the energy storage battery pack housing provided in this application is similar and will not be repeated here.

[0018] These features and advantages of the present invention will be fully disclosed in the following detailed description and accompanying drawings. The preferred embodiments or means of the present invention will be fully illustrated in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of the present invention. Furthermore, although multiple features, elements, and components may be present and are labeled with different symbols or numbers for convenience, they all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Figure 1 Schematic diagram of the structure of the energy storage battery pack shell of this embodiment;

[0021] Figure 2 is a schematic cross-sectional view of the energy storage battery pack housing of this embodiment;

[0022] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at A;

[0023] Figure 4 Schematic diagram of the exploded structure of the energy storage battery pack housing of this embodiment;

[0024] Figure 5 3D is a schematic diagram of the three-dimensional structure of the heat exchange plate of this embodiment.

[0025] Among them, 10, upper shell; 20, frame; 30, heat exchange plate; 31, boss portion; 311, mounting groove; 32, liquid inlet; 33, liquid outlet; 34, liquid flow channel; 35, mounting hole; 40, first connecting portion; 50, second connecting portion; 60, sealed cavity. DETAILED DESCRIPTION

[0026] The following describes embodiments of the present invention in detail, 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 described in the embodiments are intended to explain the present invention and are not to be construed as limiting the present invention.

[0027] Reference in this specification to "one embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment of the present patent disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0028] like Figures 1 to 5 As shown, a battery pack housing includes a housing body, the housing body including an upper housing 10, a frame 20, and a lower housing. The upper housing 10, frame 20, and lower housing enclose a sealed cavity. The lower housing is configured as a heat exchange plate 30, which is welded to the frame 20 and formed with a first connecting portion 40 and a second connecting portion 50. The first connecting portion 40 is located in the connection gap between the frame 20 and the heat exchange plate 30, facing the outside of the housing. The surface of the heat exchange plate 30 facing the frame 20 is provided with a boss 31, the circumferential outer side of the boss 31 abutting the circumferential inner side of the frame 20. The second connecting portion 50 is located at the circumferential connection between the frame 20 and the boss 31. In this embodiment, the frame 20 is configured as a rectangular frame formed by four side panels connected at the front. In other embodiments, the frame 20 can also be configured as a frame body with other structures and shapes.

[0029] In this embodiment, Figure 2 、 3 As shown, the first connection part 40 and the second connection part 50 are formed by welding the heat exchange plate 30 and the frame 20, thereby strengthening the connection strength between the frame 20 and the heat exchange plate 30 and the sealing of the sealed cavity. By providing a boss part 31 on the heat exchange plate 30 facing the side of the frame 20 and making the boss part 31 abut against the frame 20, the connection strength and sealing performance between the frame 20 and the heat exchange plate 30 are further improved.

[0030] Specifically, such as Figure 3 As shown, a height difference is formed between the first connecting portion 40 and the second connecting portion 50, and the height difference is the same as the height of the boss portion 31. By arranging the first connecting portion 40 and the second connecting portion 50 at different heights, the first connecting portion 40 and the second connecting portion 40 are staggered, and the gap between the first connecting portion 40 and the second connecting portion 50 is increased in length while being reduced in width, further improving the connection strength and sealing performance between the frame 20 and the heat exchange plate 30.

[0031] In this embodiment, the first connecting portion 40 forms a closed ring at the circumferential connection between the frame 20 and the heat exchange plate 30. The first connecting portion 40 is configured as a closed ring to improve connection strength and sealing performance.

[0032] In the embodiment, the second connecting portion 50 is formed in a closed ring shape at the circumferential connecting portion between the frame 20 and the boss portion 31. The second connecting portion 50 is also formed in a closed ring shape, thereby improving the connection strength and the sealing performance.

[0033] In the embodiment, as shown in Figures 1 to 3 The heat exchange plate 30 is internally formed with a liquid flow channel 34, and the heat exchange plate 30 is provided with a liquid inlet 32 and a liquid outlet 33 which are in communication with the liquid flow channel 34. The liquid inlet 32 and the liquid outlet 33 are both located outside the sealed cavity. The liquid flow channel 34 is internally provided with a cooling medium. The cooling liquid is injected into the liquid flow channel 34 through the liquid inlet 32 and is discharged from the liquid flow channel 34 through the liquid outlet 33. By providing the liquid flow channel 34 and the cooling medium in the channel, the heat exchange capacity of the heat exchange plate 30 is improved. The battery pack shell of the embodiment is used for a submerged liquid-cooled battery pack. The submerged liquid-cooled battery pack submerges the battery cells in the sealed cavity, injects the cooling liquid into the sealed cavity, and internally provides the heat exchange plate 30 with the liquid flow channel 34. The liquid inlet 32 and the liquid outlet 33 are provided on the heat exchange plate 30. The cooling medium is injected into the liquid flow channel 34 through the liquid inlet 32. The cooling medium absorbs the heat generated by the battery cells of the battery pack and is discharged through the liquid outlet 33 of the liquid flow channel 34. The liquid inlet 32 and the liquid outlet 33 are connected to a refrigeration device which is used to cool the cooling medium. The refrigeration device includes a compressor, a condenser and a throttling device which are in pipeline communication with each other. The connecting pipelines of the three devices are provided with a refrigerant. The refrigerant is usually R134A (1,1,1,2-tetrafluoroethane) or R410A (a new environmentally friendly refrigerant). In the prior art, a heat exchange device is used to separate the refrigeration device and the heat dissipation device. The cooling medium in the heat exchange plate 30 is cooled by the refrigeration device. The cooling medium exchanges heat with the cooling liquid in the sealed cavity. The cooling liquid absorbs the heat generated by the battery cells, thereby achieving the heat dissipation of the battery cells.

[0034] Specifically, as shown in Figure 5 The top surface of the boss portion 31 is provided with a mounting groove 311 for mounting the battery cells. By providing the mounting groove 311 on the top surface of the boss portion 31 of the heat exchange plate 30, the mounting stability between the battery pack shell and the battery cells is improved. By providing the mounting groove 311 for mounting the battery cells on the top surface of the heat exchange plate 30, the contact area between the battery cells and the heat exchange plate 30 is increased, the heat exchange efficiency between the battery cells and the heat exchange plate 30 is improved, and the heat dissipation performance of the energy storage battery pack is further improved.

[0035] In the embodiment, as shown in Figure 1As shown, the upper shell 10 and the frame 20 are detachably and sealingly connected, and specifically, the upper shell 10 and the frame 20 are detachably and threadedly connected, that is, the detachable connection is achieved by setting the screw and the screw hole matched with each other at the connection of the upper shell 10 and the frame 20, and a sealing ring is usually arranged at the connection of the upper shell 10 and the frame 20 to improve the sealing property of the energy storage battery pack shell. It should be noted that in other embodiments, the upper shell 10 and the frame 20 can also be sealingly connected in other detachable connection modes such as the snap connection, the plug-in connection and the like. The detachable connection between the upper shell 10 and the frame 20 facilitates the opening of the shell body, the formation of the second connecting part 50 between the lower shell and the frame 20, and the connection of the upper shell 10 and the frame 20 to form the sealed cavity, that is, the welding connection is performed at the inner side connection of the lower shell and the frame 20 after the opening of the upper shell 10 to form the second connecting part 50, and then the upper shell 10 is fixed to the frame 20.

[0036] Specifically, as shown in Figure 5 As shown, the heat exchange plate 30 is further provided with the mounting hole 35, and the shell body is fixedly connected with the outside through the mounting hole 35. By arranging the mounting hole 35 for mounting the battery pack on the heat exchange plate 30, the load bearing of the upper shell 10 and the frame 20 is reduced, and the stress of the first connecting part 40 and the second connecting part 50 is reduced. Specifically, the battery pack of the present embodiment is mounted into the energy storage cabinet through the mounting hole 35.

[0037] The present embodiment further provides an energy storage battery pack comprising a shell and a battery unit located in the shell, wherein the shell is the energy storage battery pack shell as described in any one of the above embodiments. The energy storage battery pack provided by the present embodiment has similar beneficial effects as the energy storage battery pack shell, and thus will not be described herein.

[0038] The present embodiment further provides an energy storage cabinet comprising a cabinet and a plurality of energy storage units located in the cabinet, wherein the energy storage units are connected in series and / or in parallel to form the energy storage cabinet, and the energy storage units are the energy storage battery pack as described above. Specifically, the energy storage battery pack is hoisted into the cabinet of the energy storage cabinet through the mounting hole 35.

[0039] In summary, the first connecting part 40 and the second connecting part 50 are formed by the welding connection of the heat exchange plate 30 and the frame 20 in the above embodiments, the connection strength between the frame 20 and the heat exchange plate 30 and the sealing property of the sealed cavity are improved, the boss part 31 is arranged on the heat exchange plate 30 and abuts against the frame 20, and the connection strength between the frame 20 and the heat exchange plate 30 and the sealing property are further improved.

[0040] The above are only specific embodiments of the present invention, but the scope of protection 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 modifications that do not deviate from the functional and structural principles of the present invention are included within the scope of the claims.

Claims

1. A battery pack housing, comprising a housing body, wherein the housing body comprises an upper housing (10), a frame (20) and a lower housing, wherein the upper housing (10), the frame (20) and the lower housing form a sealed cavity, and the lower housing is configured as a heat exchange plate (30), characterized in that: The heat exchange plate (30) is welded to the frame (20) and is provided with a first connection portion (40) and a second connection portion (50). The first connection portion (40) is located on a connection gap between the frame (20) and the heat exchange plate (30) facing the outside of the shell. A boss portion (31) is provided on the surface of the heat exchange plate (30) facing the frame (20). The circumferential outer side surface of the boss portion (31) abuts against the circumferential inner side surface of the frame (20). The second connection portion (50) is located at the circumferential connection between the frame (20) and the boss portion (31).

2. The energy storage battery pack housing according to claim 1, characterized in that: A height difference is formed between the first connecting portion (40) and the second connecting portion (50), and the height difference is the same as the height of the boss portion (31).

3. The energy storage battery pack housing according to claim 1, characterized in that: The first connecting portion (40) forms a closed ring at the circumferential connection between the frame (20) and the heat exchange plate (30).

4. The energy storage battery pack housing according to claim 1, characterized in that: The second connecting portion (50) forms a closed ring at the circumferential connection between the frame (20) and the boss portion (31).

5. The energy storage battery pack housing according to claim 1, characterized in that: A liquid circulation channel (34) is formed inside the heat exchange plate (30), and a liquid inlet (32) and a liquid outlet (33) communicating with the liquid circulation channel (34) are provided on the heat exchange plate (30), and the liquid inlet (32) and the liquid outlet (33) are both located outside the sealed cavity. A cooling medium is provided in the liquid circulation channel (34), and the cooling medium is injected into the liquid circulation channel (34) from the liquid inlet (32) and discharged from the liquid circulation channel (34) through the liquid outlet (33).

6. The energy storage battery pack housing according to any one of claims 1 to 5, characterized in that: A mounting groove (311) for mounting a battery unit is provided on the top surface of the boss portion (31).

7. The energy storage battery pack housing according to any one of claims 1 to 5, characterized in that: The upper shell (10) and the frame (20) are provided with a detachable sealed connection.

8. The energy storage battery pack housing according to any one of claims 1 to 5, characterized in that: The heat exchange plate (30) is further provided with a mounting hole (35), and the shell body is mounted through the mounting hole (35).

9. An energy storage battery pack, comprising a housing and a battery cell located inside the housing, characterized in that: The shell is configured as an energy storage battery pack shell according to any one of claims 1 to 8.

10. An energy storage cabinet, comprising a cabinet and a plurality of energy storage units located inside the cabinet, characterized in that: The energy storage unit is formed by connecting a number of energy storage battery packs in series and / or in parallel. The energy storage battery pack as claimed in claim 9.

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