Battery pack with high volume energy density and power utilization device

Abstract

The invention provides a battery pack with high volume energy density and a power utilization device. The battery pack comprises an upper cover body, a battery module, a liquid cooling assembly and two side plate assemblies, one ends of the two side plate assemblies are respectively connected with the two ends of the upper cover body, and the other ends of the two side plate assemblies are respectively connected with the two ends of the liquid cooling assembly, so that an accommodating space for accommodating the battery module is formed; the battery module comprises a plurality of battery cell modules which are arranged in the first direction, a binding band is wound around the peripheries of the battery cell modules, and each battery cell module comprises a first inner end plate, a plurality of battery cell monomers and a second inner end plate which are sequentially arranged in the second direction. Grouping force exists between the battery cells, the size is small, and the energy density is high.

Description

Technical Field

[0001] This invention belongs to the field of electrical devices and relates to a battery pack with high volumetric energy density and an electrical device. Background Technology

[0002] Existing mobile charging piles' power battery packs incorporate numerous components affecting their overall dimensions, such as anti-collision mechanisms and mounting structures, thus reducing the battery pack's energy density. To address this energy density issue, module assembly between cells is typically abandoned, significantly impacting the battery's stiffness and structural reliability under vibration conditions, making it difficult to meet the requirements of mobile charging piles.

[0003] CN201620239594.6 discloses an anti-collision structure for a mobile charging station, including a reinforced battery box, shock-absorbing cotton, flame-retardant epoxy resin board, silicone pads, impact sensors, and a laser scanner. This structure aims to prevent damage from impacts by reinforcing the battery box, dispersing impact forces, automatically cutting off the charging and discharging process, and monitoring the surrounding area. However, it only sets up anti-collision beams around the battery, increasing the overall volume of the anti-collision measures and resulting in low overall energy density of the battery pack; the technology has not achieved a breakthrough. CN202123255986.1 discloses a quick-change battery pack, employing a combination of sliding guide rails, positioning pins, and indexing pins between the frame body and the battery pack body. It utilizes rolling bearings to reduce friction and achieves quick installation and disassembly through the constraints of the positioning pins and indexing pins, avoiding the use of tools. However, its fixing mechanism protrudes significantly, affecting the overall outer dimensions and reducing the overall energy density. CN202321234847.7 discloses a stepped charger and a portable charging pile, including a main body housing, which is placed on the top layer of a chassis frame assembly. Battery packs are assembled on the remaining layers of the chassis frame assembly. A rear panel assembly is fixed to the rear of the chassis frame assembly, and a protective shell is installed on the exterior of the chassis frame assembly. The interior of the main body housing includes a module mounting area, a high-voltage component mounting plate, and a low-voltage component mounting plate. Sheet metal heat dissipation vents are embedded inside the main body housing, and an air inlet sheet metal is installed on the front side of the main body housing. Lifting lugs are welded to the exterior of the main body housing, and the exterior of the main body housing is covered by an upper cover. This stepped charger facilitates relative movement between the chassis frame assembly and the protective shell, and the stepped upper cover structure of the main body housing makes them less prone to detachment. However, the battery packs are placed inside the housing, which is a sheet metal housing with numerous welded mounting mechanisms, resulting in a large outline and low space utilization.

[0004] Therefore, it is crucial to achieve a balance between the volume and energy density of the power battery pack so that it can meet the needs of mobile charging stations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a battery pack with high volumetric energy density and a small-sized power device. This invention achieves a cell-group structure in the battery module, ensuring high energy density, and also reduces the adverse effects on the overall profile of the battery pack caused by the installation of anti-collision or hoisting mechanisms.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a high volumetric energy density battery pack, the battery pack comprising a top cover, a battery module, a liquid cooling assembly, and two side plate assemblies; one end of each of the two side plate assemblies is connected to both ends of the top cover, and the other end of each of the two side plate assemblies is connected to both ends of the liquid cooling assembly, forming a receiving space for accommodating the battery module; the battery module comprises a plurality of cell modules arranged along a first direction, the outer periphery of each cell module being wrapped with binding straps, and each cell module comprising a first inner end plate, a plurality of individual cell units, and a second inner end plate arranged sequentially along a second direction. The first direction and the second direction are perpendicular to each other.

[0008] This invention features inner end plates at both ends of the battery cell module and uses high-strength binding straps to bundle multiple battery cells together with the inner end plates. This results in a low overall thickness, small turning radius, and reduced battery module volume. At the same time, the battery cells form a grouping force, effectively improving the overall rigidity and structural reliability of the battery pack.

[0009] As a preferred embodiment of the present invention, ceramic silicone foam is independently provided between two adjacent battery cells in the battery cell module, between the battery cell and the first inner end plate, and between the battery cell and the second inner end plate.

[0010] This invention utilizes the thermal conductivity of ceramic silicone foam at room temperature to reduce the temperature difference between individual cells in the battery pack and extend their lifespan. After thermal runaway occurs in the battery pack, the ceramic silicone foam hardens due to heat, exhibiting strong thermal insulation properties. In addition, the ceramic silicone foam is also compressible, which can absorb the expansion at the end of the cell's lifespan.

[0011] In one embodiment of the present invention, heat insulation plates are respectively provided between two adjacent cell modules in the battery module and between the cell module and the side plate assembly.

[0012] In one embodiment of the present invention, the first inner end plate and the second inner end plate are respectively provided with an upper limit groove and a lower limit groove at both ends in a first direction, and the binding strap passes around the area between the upper limit groove and the lower limit groove.

[0013] In one embodiment of the present invention, the first inner end plate and the second inner end plate are sheet metal end plates.

[0014] In one embodiment of the present invention, the binding strap is fiberglass tape.

[0015] This invention uses fiberglass tape instead of traditional plastic steel tape, which is low in cost, thin, and has a small turning radius, thus helping to reduce the size of the battery module.

[0016] As a preferred embodiment of the present invention, the battery module is provided with a first connecting beam and a second connecting beam at both ends in the second direction. Both the first connecting beam and the second connecting beam extend along the first direction and are independently connected to two side plate assemblies at both ends. The first connecting beam is movably connected to the first inner end plates of a plurality of cell modules, and the second connecting beam is movably connected to the second inner end plates of a plurality of cell modules.

[0017] As a preferred embodiment of the present invention, the first connecting beam and the second connecting beam are respectively provided with two reinforcing flanges on both sides of the third direction. The reinforcing flanges extend along the first direction and bend away from the battery cell module. The first direction, the second direction and the third direction are perpendicular to each other.

[0018] In one embodiment of the present invention, two first connectors are respectively provided at both ends of the first connecting beam and the second connecting beam in a first direction, and the two first connectors are respectively movably connected to the two side plate assemblies.

[0019] In one embodiment of the present invention, the first connecting beam and the second connecting beam are each independently provided with a plurality of positioning holes, and the plurality of positioning holes are arranged sequentially along the first direction. The first inner end plate and the second inner end plate are each independently provided with at least two second connecting members at both ends in the third direction. The second connecting members of the first inner end plate are connected to the positioning holes of the first connecting beam by fasteners, and the second connecting members of the second inner end plate are connected to the positioning holes of the second connecting beam by fasteners.

[0020] In one embodiment of the present invention, the number of the first connecting beam and the second connecting beam is at least two.

[0021] As a preferred embodiment of the present invention, a CCS component is provided on the side of the battery module away from the liquid cooling component, and an insulating cover plate is provided between the CCS component and the upper cover.

[0022] In one embodiment of the present invention, the CCS component is fixedly connected to the battery cell.

[0023] In one embodiment of the present invention, the insulating cover is fitted to the CCS component.

[0024] As a preferred embodiment of the present invention, the liquid cooling assembly includes a liquid cooling plate, and two copper water nozzles are respectively provided at both ends of the liquid cooling plate.

[0025] In one embodiment of the present invention, a plurality of limiting strips are provided at intervals on the side surface of the liquid cooling plate near the battery module, and structural adhesive is provided between two adjacent limiting strips.

[0026] This invention, by setting a limiting strip on the liquid cooling plate, can limit the thickness of the structural adhesive between the bottom end face of the battery cell module and the top end face of the liquid cooling plate, thereby improving the connection strength and adhesion, and enabling the battery cell module to be stably connected to the liquid cooling plate.

[0027] In one embodiment of the present invention, the liquid cooling plate is provided with a plurality of threaded holes along the circumferential direction, the threaded holes being used to connect the side plate assembly or the upper cover.

[0028] As a preferred embodiment of the present invention, the side panel assembly includes a side panel body, and the side panel body is provided with a side panel flange, which is connected to the upper cover.

[0029] In one embodiment of the present invention, a plurality of third connectors are provided on the side plate flange, and the third connectors are connected to the upper cover.

[0030] In one embodiment of the present invention, at least two adjacent sides of the side panel body are provided with side panel flanges, and a chamfer flange is provided between two adjacent side panel flanges.

[0031] In one embodiment of the present invention, the end face of the side plate body is provided with a plurality of first fixing holes, the first fixing holes being used to connect the first connecting beam or the second connecting beam.

[0032] In one embodiment of the present invention, a plurality of second fixing holes are provided on one side edge of the side plate body near the liquid cooling assembly, and the second fixing holes are used to connect the liquid cooling assembly.

[0033] As a preferred embodiment of the present invention, the battery pack further includes a control component, which includes a BMS component and a bracket. The bracket is connected to the battery module, the BMS component is fixedly connected to the bracket, and an epoxy board is provided on the side of the BMS component near the bracket.

[0034] In one embodiment of the present invention, the bracket includes an upper clamping part, a connecting part and a lower clamping part connected sequentially from top to bottom. The upper clamping part and the lower clamping part are respectively provided with a third fixing hole and a fourth connecting member. The third fixing hole is used to connect the first inner end plate or the second inner end plate, and the fourth connecting member is connected to the first connecting beam or the second connecting beam.

[0035] In one embodiment of the present invention, the linear length of the upper clamp portion and the lower clamp portion in the first direction is equal to the linear length of the battery cell in the first direction.

[0036] As a preferred embodiment of the present invention, an electrical panel is provided on the upper cover.

[0037] In one embodiment of the present invention, the upper cover has a "U" shaped structure.

[0038] In one embodiment of the present invention, the upper cover is provided with a clearance groove, and the electrical panel is disposed in the clearance groove.

[0039] In one embodiment of the present invention, the upper cover is provided with a plurality of first fixing holes, which are distributed along the outer edge of the clearance groove, and the first fixing holes are used to fix the electrical panel.

[0040] In one embodiment of the present invention, a plurality of second fixing holes are provided along the edge of the upper cover, the second fixing holes being used to connect the liquid cooling assembly or the side plate assembly.

[0041] In a second aspect, the present invention provides an electrical device comprising the high volumetric energy density battery pack described in the first aspect.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The present invention provides a high volumetric energy density battery pack and an electrical device in which the battery module cells are bundled together to improve the energy density of the battery pack, the overall rigidity of the battery is high, the structure is reliable, the cell life is long, the overall outer contour size of the battery pack is small, and the space utilization rate is high. Attached Figure Description

[0044] Figure 1 A schematic diagram of a high volumetric energy density battery pack provided for one specific embodiment.

[0045] Figure 2 An exploded view of a high volumetric energy density battery pack provided for one specific embodiment.

[0046] Figure 3A schematic diagram of the structure of the upper cover provided for a specific embodiment.

[0047] Figure 4 A schematic diagram of a battery module provided for one specific implementation.

[0048] Figure 5 An exploded view of a battery module provided for one specific embodiment.

[0049] Figure 6 This is a schematic diagram of the structure of a battery cell module provided for a specific implementation.

[0050] Figure 7 An exploded view of a battery cell module provided for a specific embodiment.

[0051] Figure 8 The diagram shows the structure of a first inner end plate according to a specific embodiment. The first inner end plate and the second inner end plate have the same structure.

[0052] Figure 9 The diagram shows the structure of a first connecting beam in a specific embodiment. The first connecting beam has the same structure as the second connecting beam.

[0053] Figure 10 A front view of a side panel assembly provided in one specific embodiment.

[0054] Figure 11 A reverse view of a side panel assembly provided for one specific embodiment.

[0055] Figure 12 This is a schematic diagram of the assembly of a battery cell module and a liquid cooling component provided for one specific embodiment.

[0056] Figure 13 A schematic diagram of the structure of a liquid cooling plate provided for a specific embodiment.

[0057] Figure 14 A schematic diagram of the limiting strip on a liquid cooling plate provided in a specific embodiment.

[0058] Figure 15 A schematic diagram of the structure of a control component provided in a specific implementation.

[0059] Figure 16 A schematic diagram of the support structure provided for one specific embodiment.

[0060] Among them, 1-Electrical panel; 2-Control assembly; 21-BMS component; 22-Epoxy board; 23-Bracket; 231-Fifth connector; 232-Third fixing hole; 233-Fourth connector; 234-Connecting part; 3-Side panel assembly; 31-Side panel flange; 32-Third connector; 33-Chamfered flange; 34-First fixing hole; 35-Second fixing hole; 4-Upper cover; 41-Second fixing hole position; 42-Allowing groove; 43-First fixing hole position; 5-Insulating upper cover; 6-CCS structure Components; 7-Battery module; 71-Heat insulation plate; 72-Cell module; 721-Bundling strap; 722-Cell cell; 723-Ceramic silicone foam; 724-First inner end plate; 7241-Second connector; 7242-Upper limit groove; 73-First connecting beam; 731-Reinforcing flange; 732-Positioning hole; 733-First connector; 74-Fastener; 8-Liquid cooling assembly; 81-Liquid cooling plate; 811-Copper water tap; 812-Threaded hole; 82-Limiting strip; 83-Structural adhesive. Detailed Implementation

[0061] It should be understood that in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0062] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0064] In one specific embodiment, the present invention provides a battery pack with high volumetric energy density, such as... Figure 1 and Figure 2 The device includes an upper cover 4, a battery module 7, a liquid cooling assembly 8, and two side plate assemblies 3. One end of each of the two side plate assemblies 3 is connected to both ends of the upper cover 4, and the other end of each of the two side plate assemblies 3 is connected to both ends of the liquid cooling assembly 8, forming a space for accommodating the battery module 7.

[0065] like Figure 2 As shown, a CCS component 6 is disposed on the side of the battery module 7 away from the liquid cooling assembly 8. This component is used for electrical connection, signal acquisition and transmission of the battery module 7, and also serves as insulation and protection. The CCS component 6 can be fixed to the individual battery cell 722 by laser welding. An insulating cover plate 5 is disposed between the CCS component 6 and the upper cover 4 to achieve insulation between the two. The insulating cover plate 5 can be adhered to the CCS component 6.

[0066] like Figure 3 As shown, the upper cover 4 has a U-shaped structure, is made of sheet metal, and is relatively thin, allowing it to be manually pried open for easy installation. The upper cover 4 has a clearance groove, within which the electrical panel 1 is installed. Specifically, the upper cover 4 has several first fixing holes 43 distributed along the outer edge of the clearance groove. Nuts are welded to the back 2 of the first fixing holes 43, and the electrical panel 1 is fixed using bolt assemblies. Several second fixing holes 41 are formed along the edge of the upper cover 4 for connecting the liquid cooling assembly 8 or the side plate assembly 3. The edge of the upper cover 4 includes two U-shaped edges and two horizontal edges connecting the two U-shaped edges. The second fixing holes 41 located on the U-shaped edges are bolted to the side plate assembly 3, and the second fixing holes 41 located on the horizontal edges are bolted to the liquid cooling assembly 8.

[0067] like Figure 4-7As shown, the battery module 7 includes a plurality of cell modules 72 arranged along a first direction. Each cell module 72 includes a first inner end plate 724, a plurality of individual cell units 722, and a second inner end plate arranged sequentially along a second direction. A binding strap 721 is wrapped around the outer periphery of each cell module 72 to bind the first inner end plate 724, the plurality of individual cell units 722, and the second inner end plate into a group. The number of individual cell units 722 in each cell module 72 can be 3 to 6. A first connecting beam 73 and a second connecting beam are respectively provided at both ends of the battery module 7 in the second direction. Both the first connecting beam 73 and the second connecting beam extend along the first direction, and each end is independently connected to two side plate assemblies 3. The first connecting beam 73 is movably connected to the first inner end plates 724 of the plurality of cell modules 72, and the second connecting beam is movably connected to the second inner end plates of the plurality of cell modules 72. The first direction and the second direction are perpendicular to each other.

[0068] like Figure 5 As shown, heat insulation plates 71 are respectively provided between two adjacent cell modules 72 in the battery module 7, and between the cell module 72 and the side plate assembly 3. Specifically, the heat insulation plate 71 is made of epoxy board 22 material with mica paper attached, which has good insulation and fireproof properties.

[0069] like Figure 6 and Figure 7 As shown, ceramic silicone foam 723 is independently provided between two adjacent battery cells 722 in the battery cell module 72, between the battery cell 722 and the first inner end plate 724, and between the battery cell 722 and the second inner end plate. The binding strap 721 binds the first inner end plate 724, several battery cells 722, the second inner end plate, and the internal ceramic silicone foam 723 into a whole.

[0070] Specifically, in this invention, the first inner end plate 724 and the second inner end plate, located at the beginning and end of the battery cell module 72 respectively, are both sheet metal end plates, which are small in size and high in strength. For example... Figure 8 As shown, the first inner end plate 724 and the second inner end plate are respectively provided with an upper limit groove 7242 and a lower limit groove at both ends in the first direction. The binding strap 721 bypasses the area between the upper limit groove 7242 and the lower limit groove. That is, the binding range of the binding strap 721 is between the upper limit groove 7242 and the lower limit groove of the inner end plate, which can prevent it from interfering with the first connecting beam 73 and the second connecting beam at both ends. The binding strap 721 is made of fiberglass tape, which has the advantages of low cost, small thickness and small turning radius compared with traditional plastic steel tape.

[0071] like Figure 8 As shown, the first inner end plate 724 and the second inner end plate are each independently provided with at least two second connecting members 7241 at both ends in the third direction, for connecting the first connecting beam 73 or the second connecting beam. That is, the first inner end plate 724 is connected to the first connecting beam 73 located on one side of the battery module 7 through the second connecting members 7241 to achieve a fixed connection between one side of the cell module 72 and the first connecting beam 73; the second inner end plate is connected to the second connecting beam located on the other side of the battery module 7 through the second connecting members 7241 to achieve a fixed connection between the other side of the cell module 72 and the second connecting beam. Specifically, the second connecting member 7241 can be a press-fit stud. The first direction, the second direction, and the third direction are mutually perpendicular to each other.

[0072] like Figure 9 As shown, the first connecting beam 73 and the second connecting beam each have two reinforcing flanges 731 on both sides in the third direction. These reinforcing flanges 731 extend along the first direction and bend away from the cell module 72 to enhance the rigidity between the multiple cell modules 72 and prevent the CCS component 6 from breaking. Each of the first connecting beam 73 and the second connecting beam has two first connectors 733 at both ends in the first direction, and these two first connectors 733 are movably connected to the two side plate assemblies 3. Each of the first connecting beam 73 and the second connecting beam has a plurality of positioning holes 732 independently formed on it, and these positioning holes 732 are arranged sequentially along the first direction. The positioning holes 732 on the first connecting beam 73 are connected to the second connecting pieces 7241 of the first inner end plates 724 of each cell module 72 via fasteners 7474. Similarly, the positioning holes 732 on the second connecting beam are connected to the second connecting pieces 7241 of the second inner end plates of each cell module 72 via fasteners 74, thus fixing the first inner end plate 724 to the second inner end plate. The fasteners 74 can be nuts. Preferably, there are at least two first connecting beams 73 and two second connecting beams.

[0073] like Figure 10 and Figure 11As shown, the side panel assembly 3 includes a side panel body with a side panel flange 31. The side panel flange 31 cooperates with and is fixed to the upper cover 4. Specifically, the three edges of the side panel body that meet the upper cover 4 are provided with side panel flanges 31, and a chamfered flange 33 is provided between adjacent side panel flanges 31 to transition and avoid a 90° right angle on the sealing surface of the upper cover 4, which could cause damage. Several third connectors 32 are provided on the side panel flange 31, and the third connectors 32 engage with the second fixing holes 35 located on the "U"-shaped edge. The third connectors 32 can be welded nuts, through which bolts are passed to the second fixing holes 35 on the "U"-shaped edge and then fixed with the welded nuts. Several first fixing holes 34 are provided on the end face of the side panel body. The first fixing holes 34 are used to connect the first connectors 733 located at the end of the first connecting beam 73 or the end of the second connecting beam, thereby fixing the side panel assembly 3 to the connecting beam. The side plate body has several second fixing holes 35 on one side edge near the liquid cooling component 8. The second fixing holes 35 are used to connect the liquid cooling component 8 to fix the side plate assembly 3 to the liquid cooling component 8.

[0074] like Figure 12-14 As shown, the liquid cooling assembly 8 includes a liquid cooling plate 81, which is disposed on the bottom end face of the battery module 7. Two copper water nozzles 811 are respectively provided at both ends of the liquid cooling plate 81. Several limiting strips 82 are spaced apart on the side surface of the liquid cooling plate 81 closest to the battery module 7. Structural adhesive 83 is provided between adjacent limiting strips 82. The limiting strips 82 can limit the thickness of the structural adhesive 83 between the bottom surface of the battery cell module 72 and the top surface of the liquid cooling plate 81, achieving a stable connection. Several threaded holes 812 are formed circumferentially on the liquid cooling plate 81. Bolts are passed through the second fixing hole 35 on the side plate assembly 3 and engaged with the threaded holes 812 on the short side of the liquid cooling plate 81 for fixation. Bolts are also passed through the second fixing hole 41 on the upper cover 4 and engaged with the threaded holes 812 on the long side of the liquid cooling plate 81 for fixation.

[0075] like Figure 15 As shown, the battery pack also includes a control component 2, which includes a BMS component 21 and a bracket 23. The bracket 23 is connected to the battery module 7, and the BMS component 21 is fixedly connected to the bracket 23. An epoxy board 22 is provided on the side of the BMS component 21 near the bracket 23. Figure 16As shown, the bracket 23 includes an upper clamping part, a connecting part 234, and a lower clamping part connected sequentially from top to bottom. The connecting part 234 is made of sheet metal, and the upper and lower clamping parts have a "C"-shaped structure. The upper and lower clamping parts are each independently provided with a third fixing hole 232 and a fourth connecting member 233. The third fixing hole 232 is used to connect the first inner end plate 724 or the second inner end plate, and the fourth connecting member 233 is used to connect the first connecting beam 73 or the second connecting beam. The upper and lower clamping parts are also provided with at least one fifth connecting member 231 for fixing the BMS component 21. Specifically, the fifth connecting member 231 can be a nut post, and the BMS component 21 is fixed to the fifth connecting member 231 by bolts. The linear length of the upper and lower clamping parts in the first direction is equal to the linear length of the battery cell 722 in the first direction.

[0076] In another specific embodiment, the present invention provides an electrical device comprising a high volumetric energy density battery pack as described in the specific embodiment.

[0077] In this invention, the battery cell module 72 in the battery pack is provided with sheet metal end plates at both ends, which are small in size. Multiple individual battery cells 722 are bundled with the sheet metal end plates by fiberglass tape, which effectively improves the energy density and overall rigidity of the battery pack.

[0078] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A battery pack with high volumetric energy density, characterized in that, The battery pack includes a top cover, a battery module, a liquid cooling assembly, and two side plate assemblies; one end of each of the two side plate assemblies is connected to both ends of the top cover, and the other end of each of the two side plate assemblies is connected to both ends of the liquid cooling assembly, forming a receiving space for accommodating the battery module; The battery module includes a plurality of battery cell modules arranged along a first direction. The outer periphery of each battery cell module is wrapped with binding straps. Each battery cell module includes a first inner end plate, a plurality of individual battery cells, and a second inner end plate arranged sequentially along a second direction. The first direction and the second direction are perpendicular to each other.

2. The high volumetric energy density battery pack according to claim 1, characterized in that, Ceramic silicone foam is independently provided between two adjacent battery cells in the battery cell module, between the battery cell and the first inner end plate, and between the battery cell and the second inner end plate. Preferably, heat insulation plates are provided between two adjacent cell modules in the battery module and between the cell module and the side plate assembly; Preferably, the first inner end plate and the second inner end plate are respectively provided with an upper limit groove and a lower limit groove at both ends in the first direction, and the binding strap passes around the area between the upper limit groove and the lower limit groove; Preferably, the first inner end plate and the second inner end plate are sheet metal end plates; Preferably, the binding strap is made of fiberglass tape.

3. The high volumetric energy density battery pack according to claim 1 or 2, characterized in that, The battery module is provided with a first connecting beam and a second connecting beam at both ends in the second direction. Both the first connecting beam and the second connecting beam extend along the first direction and are independently connected to two side plate assemblies at both ends. The first connecting beam is movably connected to the first inner end plates of several battery cell modules, and the second connecting beam is movably connected to the second inner end plates of several battery cell modules.

4. The high volumetric energy density battery pack according to claim 3, characterized in that, The first connecting beam and the second connecting beam are respectively provided with two reinforcing flanges on both sides of the third direction. The reinforcing flanges extend along the first direction and bend away from the battery cell module. The first direction, the second direction and the third direction are perpendicular to each other. Preferably, the first connecting beam and the second connecting beam are respectively provided with two first connecting members at both ends in the first direction, and the two first connecting members are respectively movably connected to the two side plate assemblies; Preferably, the first connecting beam and the second connecting beam are each independently provided with a plurality of positioning holes, and the plurality of positioning holes are arranged sequentially along the first direction. The first inner end plate and the second inner end plate are each independently provided with at least two second connecting members at both ends in the third direction. The second connecting members of the first inner end plate are connected to the positioning holes of the first connecting beam by fasteners, and the second connecting members of the second inner end plate are connected to the positioning holes of the second connecting beam by fasteners. Preferably, the number of the first connecting beam and the second connecting beam is at least two.

5. The high volumetric energy density battery pack according to any one of claims 1-4, characterized in that, A CCS component is provided on the side of the battery module away from the liquid cooling component, and an insulating cover plate is provided between the CCS component and the upper cover. Preferably, the CCS component is fixedly connected to the individual battery cell; Preferably, the insulating cover is fitted to the CCS component.

6. The high volumetric energy density battery pack according to any one of claims 1-5, characterized in that, The liquid cooling assembly includes a liquid cooling plate, and two copper water nozzles are respectively provided at both ends of the liquid cooling plate; Preferably, the liquid cooling plate has a plurality of limiting strips spaced apart on the side surface near the battery module, and structural adhesive is provided between two adjacent limiting strips; Preferably, the liquid cooling plate has a plurality of threaded holes along its circumference, the threaded holes being used to connect the side plate assembly or the top cover.

7. The high volumetric energy density battery pack according to claim 3 or 4, characterized in that, The side panel assembly includes a side panel body, and a side panel flange is provided on the side panel body. The side panel flange is connected to the upper cover body. Preferably, a plurality of third connectors are provided on the flange of the side panel, and the third connectors are connected to the upper cover. Preferably, at least two adjacent sides of the side panel body are provided with side panel flanges, and a chamfer flange is provided between two adjacent side panel flanges; Preferably, the end face of the side plate body is provided with a plurality of first fixing holes, the first fixing holes being used to connect the first connecting beam or the second connecting beam; Preferably, the side plate body has a plurality of second fixing holes on one edge near the liquid cooling assembly, the second fixing holes being used to connect the liquid cooling assembly.

8. The high volumetric energy density battery pack according to claim 3 or 4, characterized in that, The battery pack also includes a control component, which includes a BMS component and a bracket. The bracket is connected to the battery module, and the BMS component is fixedly connected to the bracket. An epoxy board is provided on the side of the BMS component near the bracket. Preferably, the bracket includes an upper clamping part, a connecting part, and a lower clamping part connected sequentially from top to bottom. The upper clamping part and the lower clamping part are respectively provided with a third fixing hole and a fourth connecting member. The third fixing hole is used to connect the first inner end plate or the second inner end plate, and the fourth connecting member is connected to the first connecting beam or the second connecting beam. Preferably, the linear length of the upper clip portion and the lower clip portion in the first direction is equal to the linear length of the battery cell in the first direction.

9. The high volumetric energy density battery pack according to any one of claims 1-8, characterized in that, An electrical panel is provided on the upper cover; Preferably, the upper cover has a "U" shaped structure; Preferably, the upper cover has a clearance groove, and the electrical panel is disposed in the clearance groove; Preferably, the upper cover has a plurality of first fixing holes, which are distributed along the outer edge of the clearance groove, and the first fixing holes are used to fix the electrical panel. Preferably, a plurality of second fixing holes are provided along the edge of the upper cover, the second fixing holes being used to connect the liquid cooling assembly or the side plate assembly.

10. An electrical appliance, characterized in that, The electrical device includes the high volumetric energy density battery pack as described in any one of claims 1-9.

Images