Energy storage battery pack and energy storage device

Abstract

The utility model belongs to vehicle technical field discloses energy storage battery pack and energy storage device. Energy storage battery pack includes bottom plate subassembly, battery module and box cover, wherein, bottom plate subassembly includes bottom plate and sets up fixed frame on the bottom plate, battery module sets up in the bottom plate and is located in the fixed frame, the box cover cover sets up on the battery module, and the lower extreme of box cover is linked with fixed frame, and the box cover is insulating material piece. Through setting up the box cover as insulating material piece, can dispense with setting up insulating piece between the box cover and battery module, has simplified the structure of energy storage battery pack, in addition through setting up fixed frame, on one hand, it is convenient to fix the box cover, on the other hand can avoid the overflow of the sealant between battery module and bottom plate.

Description

Technical Field

[0001] This utility model relates to the field of energy storage device technology, and in particular to an energy storage battery pack and an energy storage device. Background Technology

[0002] Energy storage battery packs generally include a housing, which provides installation space for battery modules, BMS, thermal management system, electrical connection system, etc. Through reasonable structural design, these components are fixed in the housing to ensure that they maintain a relatively stable position during the operation of the energy storage battery pack and avoid damage to components or loosening of connections due to vibration, impact and other factors.

[0003] The enclosure generally includes a base plate and a cover. Sheet metal covers are commonly used in related technologies. Sheet metal covers are heavy and costly. In addition, to prevent short circuits between the sheet metal cover and the battery cells, insulating sheets and other structures need to be installed between the sheet metal cover and the battery cells, making the structure of the energy storage battery pack more complex. Utility Model Content

[0004] The purpose of this utility model is to provide an energy storage battery pack that eliminates the need for an insulating component between the cover and the battery module, thus simplifying the structure of the energy storage battery pack; it also facilitates the fixing of the cover and prevents the sealant from overflowing between the battery module and the base plate.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Energy storage battery pack, including:

[0007] A base plate assembly, including a base plate and a fixing frame disposed on the base plate;

[0008] The battery module is mounted on the base plate and located within the fixed frame;

[0009] A cover is placed over the battery module, and the lower end of the cover is connected to the fixing frame. The cover is made of insulating material.

[0010] Another objective of this invention is to provide an energy storage device, including the energy storage battery pack described above.

[0011] The beneficial effects of this utility model are:

[0012] This utility model provides an energy storage battery pack, including a base plate assembly, a battery module, and a cover. The base plate assembly includes a base plate and a fixing frame disposed on the base plate. The battery module is disposed on the base plate and located within the fixing frame. The cover covers the battery module, and the lower end of the cover is connected to the fixing frame. The cover is made of insulating material. By making the cover an insulating material, the need for an insulating component between the cover and the battery module can be eliminated, simplifying the structure of the energy storage battery pack. In addition, the fixing frame facilitates the fixing of the cover and prevents sealant from overflowing between the battery module and the base plate. Attached Figure Description

[0013] Figure 1 This is a first-view structural schematic diagram of the energy storage battery pack provided in an embodiment of the present invention;

[0014] Figure 2 This is a second-view structural schematic diagram of the energy storage battery pack provided in an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of the energy storage battery pack after the cover is removed, according to an embodiment of this utility model.

[0016] Figure 4 This is a schematic diagram of the structure of the base plate assembly involved in the embodiments of this utility model;

[0017] Figure 5 This is a schematic diagram of the frame structure in the base plate assembly involved in this utility model embodiment.

[0018] In the picture:

[0019] 11. Frame; 111. Side frame; 112. First reinforcing member; 113. Second reinforcing member; 114. Heat exchange plate; 12. Fixing frame; 121. Fixing part; 122. Flanged part; 1221. First flanged part; 1222. Second flanged part; 1223. First rivet bolt; 1224. Second rivet bolt; 13. Limiting member; 20. Battery module; 30. Cover; 31. Top plate; 32. Side plate; 41. Compartment cover body; 42. End plate; 421. Third rivet bolt; 43. Electrical compartment. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0024] This utility model provides an energy storage battery pack, which serves as a power source for new energy vehicles as a rechargeable battery. The energy storage battery pack includes battery modules, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, all housed within a casing to form a complete functional unit capable of directly outputting electrical energy. The casing provides installation space for the battery modules, BMS, thermal management system, and electrical connection system, and through a reasonable structural design, fixes these components within the casing, ensuring they maintain a relatively stable position during operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The battery modules can store chemical energy and controllably convert it into electrical energy. In recyclable battery modules, the active materials can be reactivated through charging after discharge, allowing for continued use.

[0025] like Figures 1 to 5As shown, the energy storage battery pack provided in this embodiment includes a base plate assembly, battery modules 20, and a cover. The cover and the base plate assembly together form the housing of the energy storage battery pack, and the battery modules 20 are located inside the housing. Specifically, the base plate assembly includes a base plate and a fixing frame 12 disposed on the base plate. The base plate is the main load-bearing component of the energy storage battery pack, typically referring to a structural component installed at the bottom of the energy storage battery pack, used to support and fix components such as battery modules, battery management system, and cooling system inside the energy storage battery pack. The base plate can be made of various materials, such as high-strength materials like aluminum alloy, steel, and stainless steel. The battery modules 20 are disposed on the base plate and located within the fixing frame 12. The cover covers the battery modules 20, and the lower end of the cover is connected to the fixing frame 12. The cover is made of insulating material. By making the cover an insulating material, the need for an insulating component between the cover and the battery module 20 can be eliminated, simplifying the structure of the energy storage battery pack. In addition, by setting the fixing frame 12, it is convenient to fix the cover and prevent the sealant between the battery module 20 and the base plate from overflowing.

[0026] Alternatively, the lid may be made of engineering plastics, such as polyamide (PA), polycarbonate (PC), or polypropylene (PP). Alternatively, the lid may also be made of high-performance engineering plastics and composite materials, such as polyphenylene sulfide (PPS) or sheet molding compound (SMC)-glass fiber reinforced thermosetting composites.

[0027] Battery module 20 is composed of multiple battery cells of similar capacity and internal resistance connected in series or parallel. Specifically, refer to... Figure 3 The battery module 20 includes multiple cell groups spaced apart along a second direction. This avoids close contact between adjacent cell groups, preventing the heat generated by adjacent cell groups from accumulating and thus preventing overheating caused by heat accumulation, thereby improving the safety of the cell group. Each cell group includes multiple cells distributed along a first direction. A heat insulation pad is provided between adjacent cells in each cell group. The heat insulation pad serves to insulate against heat transfer to adjacent cells in the event of thermal runaway in one cell, thereby delaying the spread of thermal runaway in the energy storage battery pack. In this embodiment, the second direction is the length direction of the base plate assembly. In other embodiments, the second direction may also be the width direction of the base plate assembly.

[0028] Continue to refer to Figure 3The battery modules 20 are multiple, all housed within the fixed frame 12, and spaced apart along the second direction. This avoids close contact between adjacent battery modules 20, preventing the heat generated by adjacent modules from accumulating and thus preventing overheating and improving the safety of the battery modules 20. In other embodiments, the multiple battery modules 20 may also be spaced apart along the first direction, or arranged in a rectangular array along both the first and second directions.

[0029] In this embodiment, the spacing between each battery module 20 is relatively uniform, so that multiple battery modules 20 are evenly and orderly arranged on the base plate assembly, which not only effectively prevents heat diffusion and heat accumulation, but also makes the battery module 20 arrangement more regular and reasonable, which facilitates the overall layout of the energy storage battery pack and improves the safety performance of the energy storage battery pack.

[0030] The box cover includes multiple cover bodies 30, which are respectively covered on multiple battery modules 20 along the second direction.

[0031] In this embodiment, refer to Figure 1 and Figure 2 The cover 30 has a U-shaped longitudinal section and includes a top plate 31 and two side plates 32. The top plate 31 is located on the top surface of the battery module 20, and the two side plates 32 are located on both sides of the battery module 20 along a first direction. Thus, the cover 30 and the bottom plate assembly form a semi-enclosed box. In this embodiment, the first direction is the width direction of the bottom plate assembly. In other embodiments, the first direction can also be the length direction of the bottom plate assembly. Through the structural design of the cover 30, it can better fit the contour of the battery module 20, maximizing the use of space within the energy storage battery pack for cell layout, which helps to improve the volumetric energy density of the entire energy storage battery pack; it also achieves weight reduction.

[0032] The cover 30 is a one-piece molded structure. In this embodiment, the cover 30 is manufactured by hot bending of sheet material. The principle is to heat the sheet material to above its heat distortion temperature, causing it to soften and lose its rigidity, becoming soft and malleable. Then, it is applied to a mold of a specific shape, and after cooling and shaping, the desired U-shaped shape is obtained. The manufacturing process is simple and the cost is low. In other embodiments, the cover 30 can also be manufactured by injection molding or extrusion molding.

[0033] The two openings of the cover 30 are located on both sides of the battery module 20 along the second direction, and the openings of adjacent covers 30 are opposite each other. The two side plates 32 of each cover 30 are located on both sides of the corresponding battery module 20 along the first direction.

[0034] In this embodiment, the interval between adjacent cover bodies 30 is 1mm-23mm. For example, the interval between adjacent cover bodies 30 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, or 23mm. This setting ensures the heat dissipation effect of the cover while preventing interference between multiple cover bodies 30.

[0035] The length of the cover 30 along the second direction is less than or equal to 1000 mm. If the length of the cover is too long, it will be difficult to process. If the length of the cover 30 is too short, the insulation effect and support strength will be insufficient. By setting the length of the cover 30 to be less than or equal to 1000 mm, it is possible to ensure that the cover 30 is easy to process while ensuring the insulation effect and support strength.

[0036] The thickness of the lid 30 is 1mm-2mm. If the lid 30 is too thick, it will increase the overall weight; if the lid 30 is too thin, it will result in insufficient strength. By setting the thickness of the lid 30 to 1mm-2mm, it is possible to ensure that the weight of the lid is not too heavy and that the strength of the lid meets the requirements.

[0037] Reference Figure 4 and Figure 5The base plate assembly includes a frame 11 and a heat exchange plate 114. The heat exchange plate 114 is mounted on the frame 11, and the fixing frame 12 is connected to the heat exchange plate 114 and / or the frame 11. The battery module 20 is supported on the heat exchange plate 114. First, the heat exchange plate 114 can dissipate heat. During the charging and discharging process of the energy storage battery pack, especially during high-current fast charging or aggressive driving, a large amount of heat is generated inside. If the heat cannot be dissipated in time, it will cause the battery temperature to be too high. High temperature will accelerate the chemical side reactions inside the battery, leading to accelerated capacity decay, shortened cycle life, and in severe cases, even thermal runaway, causing safety accidents such as fire and explosion. By the flow of coolant in the flow channels of the heat exchange plate 114, the heat generated by the battery is carried away through convection heat transfer and heat conduction, thereby maintaining the battery's operating temperature within the optimal range. Secondly, the heat exchange plate 114 can play a heating role. In low temperature environment, the chemical reaction activity of the battery will decrease, resulting in a decrease in charging and discharging efficiency, a sharp reduction in capacity, and even the inability to charge with high current. At this time, the coolant can be heated by the heater first, and then the warm coolant flows through the flow channel of the heat exchange plate 114 to heat the battery module 20, so that it can quickly reach the appropriate working temperature. Finally, the heat exchange plate 114 also plays a role in temperature equalization. The energy storage battery pack is composed of a large number of cells. Due to the different positions of the cells and slight differences in internal resistance, the heat generation and dissipation of each cell are inconsistent, which will lead to uneven temperature within the energy storage battery pack. Uneven temperature will cause inconsistencies in parameters such as charge, voltage, and internal resistance between cells. During charging and discharging, some cells are fully charged / empty, while others are not fully charged / discharged, which seriously affects the performance and lifespan of the energy storage battery pack, and makes it difficult for the battery management system (BMS) to manage. By designing the flow channels of the heat exchange plate 114, it can be ensured that heat is carried away or transferred evenly, minimizing the temperature difference between cells in different areas of the energy storage battery pack, and ensuring that all cells operate in a similar temperature environment.

[0038] In this embodiment, refer to Figure 5 The frame 11 includes, but is not limited to, two side frames 111 spaced apart along a first direction, each side frame 111 extending along a second direction. To improve the structural strength of the frame 11, the frame 11 also includes a reinforcing structure, which includes a first reinforcing member 112 located between the two side frames 111, extending along the second direction, and connected to the heat exchange plate 114. Furthermore, the reinforcing structure also includes multiple second reinforcing members 113, spaced apart along the second direction, with each second reinforcing member 113 connected to both ends of the two side frames 111, and each second reinforcing member 113 also connected to the first reinforcing member 112. This structural arrangement ensures both material savings and weight reduction while maintaining structural strength.

[0039] In this embodiment, refer to Figure 4The base plate assembly also includes multiple sets of limiting members 13, each corresponding to one of the multiple battery modules 20. Each set of limiting members 13 includes two limiting members 13, located on either side of the battery module 20 along the second direction, to limit the position of the battery module 20 along the second direction and ensure a certain distance between adjacent battery modules 20. Optionally, the limiting members 13 can be connected to the fixing frame 12 or the base plate assembly. Optionally, the limiting members 13 can be positionally adjustable to make the installation of the battery modules 20 more flexible.

[0040] Continue to refer to Figure 4 and combined Figures 1 to 3 The fixing frame 12 includes a fixing part 121 and a flange part 122. The fixing part 121 is connected to the heat exchange plate 114 and / or the frame 11, and the flange part 122 is connected to the side plate 32 of the cover 30. The flange part 122 forms a enclosure space, in which the battery module 20 is located. The flange part 122 serves to connect the cover 30 and also prevents the sealant between the battery module 20 and the base plate from overflowing.

[0041] In this embodiment, the flange portion 122 includes two first flange portions 1221 and two second flange portions 1222. The two first flange portions 1221 are distributed opposite to each other along a first direction, and the two second flange portions 1222 are distributed opposite to each other along a second direction. The limiting member 13 is parallel to the second flange portions 1222. Optionally, the flange portion 122 is a split structure to facilitate molding and manufacturing.

[0042] In this embodiment, the height of the flange 122 is 25mm-35mm. For example, the flange height can be 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, or 35mm, preferably 30mm. If the flange 122 is too high, it will be difficult to process; if the flange 122 is too low, it will be inconvenient to connect with the cover and cannot guarantee that the sealant between the battery module 20 and the base plate assembly will be blocked. By setting the height of the flange 122 as described above, it is possible to ensure that the fixing frame 12 is easy to process, that the flange 122 is easy to connect with the cover 30, and that the sealant between the battery module 20 and the base plate assembly is effectively blocked.

[0043] In this embodiment, a plurality of first rivet bolts 1223 are provided on the first flange portion 1221, and the plurality of first rivet bolts 1223 are distributed at intervals along the second direction. A plurality of first connecting holes are provided on the side plate 32 of the cover 30, and the plurality of first connecting holes correspond one-to-one with the plurality of first rivet bolts 1223. The first rivet bolts 1223 pass through the first connecting holes and are fastened to the nuts. By providing rivet bolts on the first flange portion 1221, the cover 30 and the first flange portion 1221 can be connected simply by tightening the nuts on the outside of the cover 30, which is convenient. In other embodiments, the cover 30 and the first flange portion 1221 can also be snap-fitted.

[0044] Reference Figure 2 The energy storage battery pack provided in this embodiment also includes a compartment cover. The compartment cover is connected to the first flange 1221 of the fixing frame 12 and overlaps with one end of the box cover. An electrical compartment 43 is formed inside the compartment cover, which is used to place electrical components. Specifically, the compartment cover includes a compartment cover body 41 and an end plate 42. The compartment cover body 41 is U-shaped. The two side plates of the compartment cover body 41 are respectively connected to the two first flanges 1221. The end of the compartment cover body 41 near the box cover is open and overlaps the box cover. The end plate 42 is disposed at the opening on the side of the compartment cover body 41 away from the box cover.

[0045] In this embodiment, a second connecting hole is provided on the side plate of the cover body 41, and a first rivet bolt 1223 passes through the second connecting hole and is fastened to the nut. By providing a rivet bolt on the first flange 1221, the cover body 41 and the first flange 1221 can be connected simply by tightening the nut on the outside of the cover body 41, which is convenient. In other embodiments, the cover body 41 and the first flange 1221 can also be connected by a snap-fit ​​mechanism.

[0046] In this embodiment, a second rivet bolt 1224 is provided on the second flange portion 1222 near the end plate 42. Multiple second rivet bolts 1224 are spaced apart along a first direction. Multiple third connecting holes are provided on the end plate 42, each corresponding to one of the multiple second rivet bolts 1224. The second rivet bolts 1224 pass through the third connecting holes and are fastened to a nut. By providing rivet bolts on the second flange portion 1222, the end plate 42 and the second flange portion 1222 can be connected simply by tightening the nut on the outside of the end plate 42, making the operation convenient. In other embodiments, the end plate 42 and the second flange portion 1222 can also be connected by a snap-fit ​​mechanism.

[0047] In this embodiment, the top and side ends of the end plate 42 are provided with a plurality of third rivet bolts 421, and the top plate and side plates of the cover body 41 are provided with a plurality of fourth connecting holes. Each of the fourth connecting holes corresponds one-to-one with a plurality of third rivet bolts 421, and the third rivet bolts 421 pass through the fourth connecting holes and are fastened to the end plate with nuts. By providing rivet bolts on the end plate 42, the cover body 41 and the end plate 42 can be connected simply by tightening the nuts on the outside of the cover body 41, making the operation convenient. In other embodiments, the cover body 41 and the end plate 42 can also be connected by a snap-fit ​​mechanism.

[0048] This utility model embodiment also provides an energy storage device, including the above-described energy storage battery pack. By using the above-described energy storage battery pack, the overall structure can be simplified and the overall weight reduced.

[0049] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An energy storage battery pack, characterized in that, include: The base plate assembly includes a base plate and a fixing frame (12) disposed on the base plate; The battery module (20) is disposed on the base plate and located within the fixing frame (12); The cover is placed over the battery module (20), and the lower end of the cover is connected to the fixing frame (12). The cover is made of insulating material.

2. The battery pack according to claim 1, characterized in that, The fixed frame (12) includes a fixed part (121) and a flanged part (122). The fixed part (121) is connected to the base plate, and the flanged part (122) is fixedly connected to the box cover.

3. The energy storage battery pack according to claim 2, characterized in that, The height of the flange (122) is 10mm-40mm.

4. The energy storage battery pack according to claim 2, characterized in that, The flange (122) is provided with a rivet bolt, and the box cover is provided with a connecting hole. The rivet bolt passes through the connecting hole and is fastened to the nut.

5. The energy storage battery pack according to claim 1, characterized in that, The number of battery modules (20) is multiple, and the multiple battery modules (20) are all located within the fixed frame (12) and are spaced apart along the second direction; the box cover includes multiple cover bodies (30), and the multiple cover bodies (30) respectively cover the multiple battery modules (20).

6. The energy storage battery pack according to claim 5, characterized in that, The interval between adjacent covers (30) is 1mm-23mm.

7. The energy storage battery pack according to claim 5, characterized in that, The base plate assembly also includes multiple sets of limiting members (13), each set of limiting members (13) corresponding to multiple battery modules (20). Each set of limiting members (13) includes two limiting members (13), which are located on both sides of the battery module (20) along the second direction.

8. The energy storage battery pack according to claim 5, characterized in that, The length of the cover (30) along the second direction is less than or equal to 1000 mm.

9. The energy storage battery pack according to claim 5, characterized in that, The thickness of the cover (30) is 1mm-2mm.

10. The energy storage battery pack according to claim 5, characterized in that, The cover (30) includes a top plate (31) and two side plates (32). The top plate (31) is located on the top surface of the battery module (20), and the two side plates (32) are located on both sides of the battery module (20) along a first direction.

11. The energy storage battery pack according to claim 10, characterized in that, The cover (30) is a one-piece molded structure.

12. The energy storage battery pack according to claim 1, characterized in that, The base plate includes a frame (11) and a heat exchange plate (114). The heat exchange plate (114) is disposed on the frame (11). The fixing frame (12) is connected to the heat exchange plate (114) and / or the frame (11). The battery module (20) is supported on the heat exchange plate (114).

13. The energy storage battery pack according to claim 12, characterized in that, The frame (11) includes two borders (111) spaced apart along a first direction.

14. The energy storage battery pack according to claim 13, characterized in that, The frame (11) further includes a first reinforcing member (112) located between the two side frames (111) and extending along a second direction and connected to the heat exchange plate (114).

15. The energy storage battery pack according to claim 14, characterized in that, The frame (11) further includes a plurality of second reinforcing members (113), which are spaced apart along the second direction. Each second reinforcing member (113) is connected to two side frames (111) at both ends, and each second reinforcing member (113) is connected to the first reinforcing member (112).

16. An energy storage device, characterized in that, Includes the energy storage battery pack according to any one of claims 1-15.

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