Battery pack and electrical apparatus

Abstract

The present application provides a battery pack and an electrical apparatus. The battery pack comprises a box body and a battery cell group. The battery cell group is mounted between two side plates of the box body in such as manner as to allow thermal conduction. At least one side plate comprises a plurality of fins, and the plurality of fins extend in the length direction of the box body and are arranged at intervals in the height direction of the box body. The battery cell group dissipates heat by means of the fins in the side plates, thereby removing the requirement for heat dissipation devices such as multi-port tubes and axial fans, reducing operating power consumption and reducing the overall size of the battery pack.

Description

Battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421991625.4 filed on August 15, 2024 with the Chinese Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of power battery, in particular to a battery pack and an electric device. BACKGROUND

[0003] In the related art, the battery pack adopts a process mode of module into box, the module is composed of aluminum end plate, harmonica tube and steel belt, and after the module is put into the box, an axial flow fan is used to send or extract air to take away heat at the front of the box; the process mode has many structural parts, the production process flow is complex, the efficiency is low, and the fan increases the operating power consumption of the battery pack and reduces the efficiency, at the same time, the harmonica tube is used to separate the cells in the module, which leads to a large size of the box. SUMMARY

[0004] The battery pack in the related art has the technical problems of large operating power consumption and large size of the battery pack.

[0005] The present application provides a battery pack, which comprises a box body and at least one cell group, the box body comprises a bottom plate and at least two side plates connected to the bottom plate, the at least two side plates extend along the length direction of the box body and are oppositely arranged in the width direction of the box body. Each cell group comprises a plurality of cells arranged along the length direction of the box body and spaced apart from each other, and the cells are installed in heat conduction between the corresponding adjacent two side plates. At least one side plate comprises a plurality of fins, the plurality of fins are arranged along the length direction of the box body and are spaced apart along the height direction of the box body.

[0006] The present application also provides an electric device, which comprises the battery pack described above. ADVANTAGEOUS EFFECTS

[0007] The battery pack provided by the present application can improve the heat dissipation efficiency by arranging the cells in the cell group along the length direction and installing the cells in heat conduction between the corresponding adjacent two side plates, and can remove the harmonica tube, axial fan and other heat dissipation devices, thereby reducing the operating power consumption and the overall size of the battery pack, and improving the phenomenon of large operating power consumption and large size of the battery pack in the prior art.

[0008] The electric device provided by the present application has all the advantageous effects of the battery pack described above. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a perspective view of the battery pack provided by the embodiment of the present application;

[0010] Fig. 2 is an exploded schematic view of a battery pack according to an embodiment of the present application;

[0011] Fig. 3 is a perspective view of a box of a battery pack according to an embodiment of the present application;

[0012] Fig. 4 is a front view of a battery pack according to an embodiment of the present application;

[0013] Fig. 5 is a top view of a battery pack according to an embodiment of the present application;

[0014] Fig. 6 is a side view of a battery pack according to an embodiment of the present application;

[0015] Fig. 7 is a schematic view of a battery pack according to an embodiment of the present application in a top view.

[0016] Legend of reference signs:

[0017] 1, bottom plate; 2, side plate; 21, first side plate; 22, second side plate; 23, third side plate; 3, cell group; 31, cell; 4, fin; 5, end plate, 51, front end plate; 52, rear end plate; 6, glue structure; 7, buffer; 8, cell explosion-proof valve; 9, first through hole; 10, second through hole; 11, limiting piece; 12, notch; 13, first output row; 131, first part; 132, second part; 133, third part; 14, second output row; 15, first end; 16, handle; 17, series row; 18, partition plate; 19, second end; 20, insulating sheet. Embodiment of the present application

[0018] Please refer to Figs. 1-7, the battery pack according to an embodiment of the present application comprises a box and at least one cell group 3, the box comprises a bottom plate 1 and at least two side plates 2 connected to the bottom plate 1, the at least one cell group 3 comprises a plurality of cells 31 arranged along the length direction of the box and spaced from each other, and the cells 31 are installed in heat conduction between the corresponding adjacent two side plates 2, the at least one side plate 2 comprises a plurality of fins 4, the plurality of fins 4 are arranged along the length direction of the box and spaced along the height direction of the box.

[0019] Among them, the at least two side plates 2 extend along the length direction of the box and are oppositely arranged in the width direction of the box.

[0020] In this embodiment, since the cell group 3 is installed in heat conduction between the adjacent two side plates 2, the cell group 3 is cooled by the fins 4 in the side plate 2, so that the heat dissipation devices such as harmonica tube and axial fan are removed, not only the running power consumption is reduced, but also the overall size of the battery pack is reduced, and the phenomenon of large running power consumption and large size of the battery pack in the prior art is alleviated.

[0021] The technical solutions of the present application will be described in detail below with reference to specific embodiments.

[0022] In an embodiment, referring to FIG. 3, the box further comprises an end plate 5 connected to the end of the bottom plate 1 and the end of at least two side plates 2, and the end plate 5 is provided with a first through hole 9 which is arranged in position with the corresponding fin 4.

[0023] In this embodiment, the end plate 5 comprises a front end plate 51 located on one side of the box and a rear end plate 52 located on the opposite side of the box.

[0024] In this embodiment, the first through hole 9 can be selectively arranged on at least one of the front end plate 51 and the rear end plate 52.

[0025] It can be understood that by opening a hole in the end plate 5 in position with the fin 4, the airflow can enter the fin 4 to carry heat, thereby enhancing the heat dissipation efficiency of the fin 4 to the chip set.

[0026] In this embodiment, by opening the first through hole 9 in the end plate 5 opposite the fin 4, the airflow enters between the fins 4 through the first through hole 9, thereby enhancing the heat dissipation efficiency of the fin 4 to the chip set.

[0027] In an embodiment, referring to FIG. 1, FIG. 3, FIG. 4, FIG. 5 and FIG. 6, in the same side plate 2, two adjacent fins 4 form a ventilation hole therebetween, and at least two ventilation holes are in communication with the first through hole 9.

[0028] In this embodiment, the adjacent fins 4 are arranged at equal intervals along the thickness direction of the box.

[0029] In this embodiment, the adjacent fins 4 can also be thermally connected, and the heat exchange between different fins 4 can avoid the accumulation of heat on a certain fin 4.

[0030] It can be understood that the ventilation hole can be opposite and in communication with the first through hole 9, so that the airflow of the first through hole 9 can pass through the ventilation hole to carry away the heat on the adjacent fins 4 on both sides of the ventilation hole.

[0031] In this embodiment, the ventilation hole can improve the heat dissipation efficiency of the fin 4.

[0032] In an embodiment, referring to FIG. 1, FIG. 2, FIG. 4, FIG. 5 and FIG. 6, the battery pack further comprises a glue structure 6 arranged continuously, and each battery cell group 3 is thermally connected between the corresponding adjacent two side plates 2 through the glue structure 6, and the glue structure 6 covers the top surface and the side surface of at least one battery cell 31.

[0033] In this embodiment, each battery cell 31 is wrapped by the glue structure 6 to form a heat conduction whole, so that the temperature rise data of each battery cell 31 is consistent, which is also conducive to improving the heat dissipation uniformity of each battery cell 31.

[0034] The battery pack further comprises a CCS integrated busbar, and the CCS integrated busbar is wrapped by the glue structure 6, so that the CCS integrated busbar is isolated from the outside world, and the influence of air conditioner condensation on short circuit can be avoided.

[0035] In the embodiment, by means of the glue structure 6 arranged continuously and integrally, on the one hand, the temperature rise data of each battery cell 31 are consistent, and on the other hand, heat conduction between the glue structure 6 and the fins 4 is utilized to realize heat dissipation of the battery cell group 3, so that the heat dissipation device such as a harmonica tube and an axial fan can be removed, thereby improving the heat dissipation efficiency and reducing the size and power consumption of the battery pack.

[0036] In an embodiment, the glue structure 6 is prepared from AB glue.

[0037] The AB glue has the effects of fixing and heat conduction.

[0038] The AB glue comprises base glue and hardener, and the base glue and the hardener are mixed to realize hardening of the glue structure 6.

[0039] It can be understood that the preparation material of the glue structure 6 can also be selected from any one or more of structural glue, heat-conducting glue and pouring glue, which can be selected according to a specific process.

[0040] In an embodiment, referring to FIG. 7, in the same battery cell group 3, the bottom surface and the side surface of at least one battery cell 31 are provided with a buffer 7, so that a gap is formed between the at least one battery cell 31 and the bottom plate 1 and between adjacent two battery cells 31, and the glue structure 6 is filled in the gap.

[0041] The buffer 7 is prepared from a buffer material and can prevent collision and damage between adjacent battery cells 31, the battery cell 31 and the side plate 2 and the bottom plate 1.

[0042] It can be understood that the buffer 7 also has the effect of blocking adjacent battery cells 31, the battery cell 31 and the bottom plate 1 and the side plate 2, so that a gap exists between adjacent battery cells 31, the battery cell 31 and the bottom plate 1 and the side plate 2, and the glue structure 6 can pass through the gap to wrap the battery cell 31.

[0043] In the embodiment, the buffer 7 is used to make the battery cell 31 have a certain gap with the battery cell 31, the side plate 2 and the bottom plate 1, so that each battery cell 31 can be wrapped by the glue structure 6 during subsequent pouring of glue.

[0044] In an embodiment, each battery cell 31 comprises a battery cell explosion-proof valve 8, and the top of the glue structure 6 is provided with a plurality of second through holes 10, each second through hole 10 exposes a corresponding battery cell explosion-proof valve 8.

[0045] The size of the second through hole 10 is greater than or equal to the size of the battery cell explosion-proof valve 8.

[0046] It can be understood that the explosion-proof valve 8 is used to discharge the gas in the battery cell 31 to avoid the explosion of the battery cell 31, and the second through hole 10 is used to expose the explosion-proof valve 8, so that the glue structure 6 cannot block the gas outlet of the explosion-proof valve 8, and the normal operation of the explosion-proof valve 8 is facilitated.

[0047] In the embodiment, by removing the glue structure 6 above the explosion-proof valve 8 and forming the second through hole 10, the gas outlet of the explosion-proof valve 8 is prevented from being blocked by the glue structure 6 and being disabled.

[0048] In an embodiment, referring to FIGS. 1, 2 and 7, the battery cell group 3 includes two battery cell groups 3, i.e., a first battery cell group 3 and a second battery cell group 3, and the side plate 2 includes three side plates 2, i.e., a first side plate 21, a third side plate 23 and a second side plate 22 located between the first side plate 21 and the third side plate 23, the first battery cell group 3 is installed between the first side plate 21 and the second side plate 22, and the second battery cell group 3 is installed between the second side plate 22 and the third side plate 23; wherein the battery pack further includes a first output row 13 and a second output row 14, one end of the first output row 13 is connected to the first battery cell group 3, the other first end 15 of the first output row 13 is close to the third side plate 23, one end of the second output row 14 is connected to the second battery cell group 3, and the other second end 19 of the second output row 14 is close to the third side plate 23.

[0049] Among them, a plurality of battery cells 31 are connected in series between the first output row 13 and the second output row 14.

[0050] It can be understood that by arranging the first end 15 and the second end 19 of the first output row 13 and the second output row 14, which are in contact with the end plate 5, close to the third side plate 23 and adjacent to each other, the distance between the first end 15 of the first output row 13 and the second end 19 of the second output row 14 can be reduced, and the electrical connection between the battery pack and the external circuit is facilitated.

[0051] In the embodiment, the distance between the first end 15 and the second end 19 of the first output row 13 and the second output row 14, which are in contact with the end plate 5, is reduced, and the electrical connection between the battery pack and the external circuit is facilitated.

[0052] In an embodiment, referring to FIGS. 1 and 3, the second side plate 22 is provided with a limiting piece 11 and a gap 12, the first output row 13 passes through the gap 12 and is located between the bottom wall of the gap 12 and the limiting piece 11.

[0053] Among them, the limiting piece 11 is used to prevent the first output row 13 from being pulled out of the gap 12.

[0054] The notch 12 is used to hide the first output row 13, so that the first output row 13 can pass through the second side plate 22, and the other first end 15 of the first output row 13 is arranged close to the third side plate 23.

[0055] In an embodiment, the first output row 13 comprises a first part 131, a third part 133, and a second part 132 connected between the first part 131 and the third part 133 in a bent manner; the first part 131 is connected between the first cell group 3 and the second part 132, the second part 132 passes through the notch 12, and the third part 133 is close to the third side plate 23; the second part 132 is above the first part 131 and the third part 133, and the second output row 14 is on the side of the third part 133 away from the third side plate 23 and below the second part 132.

[0056] In an embodiment, please refer to FIG. 3, the top surface of the box is hollowed out.

[0057] It can be understood that the top surface of the box is hollowed out, and the top plate is not needed, on the one hand, the glue structure 6 can replace the function of the top plate, and on the other hand, in the structure of multiple battery packs stacked in the longitudinal direction, adjacent two battery packs can share a bottom plate 1, that is, the bottom plate 1 of the upper battery pack in the adjacent two battery packs can be shared as the top plate of the lower battery pack.

[0058] In this embodiment, the top plate of the battery pack is removed, on the one hand, it is convenient for the glue structure 6 to form, and on the other hand, it saves materials and simplifies the structure.

[0059] In an embodiment, the bottom plate 1 and the side plate 2 of the box can be an integrally formed structure.

[0060] The material of the box can be aluminum.

[0061] It can be understood that the fin 4 is arranged inside the side plate 2, the outer surface of the fin 4 is in contact with the inner surface of the side plate 2, and the glue structure 6 is in contact with the outer surface of the side plate 2, so that the glue structure 6 conducts the heat of the cell 31 out and conducts it to the fin 4 for heat dissipation through the side plate 2.

[0062] In an embodiment, please refer to FIG. 3, the battery pack comprises a cell 31 arrangement area and a wire arrangement area on both sides of the partition plate 18, the cell 31 arrangement area is arranged close to the front end plate 51 relative to the wire arrangement area, and the outer surface of the front end plate 51 is further provided with a handle 16 for moving the box.

[0063] It can be understood that the electric core 31 setting area includes a plurality of electric core groups 3, the wire setting area includes the BMU, the series connection row 17 and the insulating sheet 20, the series connection row 17 is arranged on the insulating sheet 20 at intervals, and is connected with the lower electric core 31 through the via hole penetrating the insulating sheet 20, when the wire setting area needs to be maintained, the battery pack is pulled out through the handle 16, since the top surface of the battery pack is hollow, the wire setting area of the battery pack can be directly maintained.

[0064] In the second aspect, the embodiments of the present application provide a power utilization device, which comprises the battery pack according to any one of the above embodiments.

[0065] In the third aspect, the embodiments of the present application provide a battery pack stacking structure, which comprises a plurality of battery packs according to any one of the above embodiments, and the plurality of battery packs are arranged in layers, and in two adjacent battery packs along the stacking direction, the bottom plate 1 of one battery pack covers the top surface of the other battery pack.

[0066] The present application provides a battery pack, which sets the fin 4 for heat dissipation in the side plate 2 of the box body, the fin 4 is in heat conduction connection with the electric core group 3, so that the mouth organ pipe and the axial fan are not needed to be set, the size of the battery pack is reduced, the electric energy loss is reduced, and the electric energy conversion efficiency is improved.

[0067] In addition, the glue structure 6 is continuous and wraps each electric core 31, so that the temperature rise data of the electric core 31 is consistent.

[0068] In addition, since the battery pack of the present application does not adopt the mode of module into the box, but directly inserts the electric core 31 into the box, the use of structural parts is reduced, and the assembly efficiency is improved.

[0069] In addition, the box body after being filled with glue is integrated, and the battery pack can withstand a large extrusion force in each direction.

Claims

1. A battery pack comprising: a box comprising a bottom plate and at least two side plates connected to the bottom plate, the at least two side plates extending along a length direction of the box and oppositely arranged along a width direction of the box; at least one cell group, each of the cell groups comprising a plurality of cells arranged along the length direction of the box and spaced apart from each other, and thermally connected between corresponding adjacent two side plates; wherein at least one of the side plates comprises a plurality of fins extending along the length direction of the box and spaced apart along a height direction of the box.

2. The battery pack of claim 1, wherein, The box further comprises an end plate connected to an end of the bottom plate and ends of the at least two side plates, the end plate being provided with a first through hole arranged in alignment with the corresponding fins.

3. The battery pack of claim 2, wherein, The end plate comprises a front end plate located on one side of the box and a rear end plate located on the opposite side of the box.

4. The battery pack of claim 3, wherein, The outer surface of the front end plate is further provided with a handle for moving the box.

5. The battery pack of any one of claims 2-4, wherein, In the same side plate, ventilation holes are formed between adjacent two fins, and at least two of the ventilation holes are in communication with the first through hole. 6.The battery pack of any one of claims 1-5, further comprising a glue structure arranged continuously, each of the cell groups being thermally connected between corresponding adjacent two side plates by the glue structure, the glue structure covering a top surface and a side surface of at least one of the cells. 7.The battery pack of claim 6, further comprising a CSS integrated busbar, the glue structure wrapping the CSS integrated busbar.

8. The battery pack of claim 6 or 7, wherein, In the same cell group, a bottom surface and a side surface of at least one of the cells are provided with a buffer to form a gap between at least one of the cells and the bottom plate and between adjacent two cells, and the glue structure is filled in the gap.

9. The battery pack of any one of claims 6-8, wherein, Each of the cells comprises a cell explosion-proof valve, and a top portion of the glue structure is provided with a plurality of second through holes, each of the second through holes exposing a corresponding cell explosion-proof valve.

10. The battery pack of any one of claims 1-9, wherein, The cell groups are two, the two cell groups comprising a first cell group and a second cell group, and the side plates are three, the three side plates comprising a first side plate, a third side plate, and a second side plate located between the first side plate and the third side plate, the first cell group being arranged between the first side plate and the second side plate, and the second cell group being arranged between the second side plate and the third side plate. 11.The battery pack of claim 10, further comprising a first output bus and a second output bus, one end of the first output bus being connected to the first cell group, the other first end of the first output bus being close to the third side plate, one end of the second output bus being connected to the second cell group, and the other second end of the second output bus being close to the third side plate.

12. The battery pack of claim 11, wherein, The first output bus and the second output bus are in series with a plurality of the cells.

13. The battery pack of any one of claims 10-12, wherein, A top portion of the second side plate is provided with a limiting piece and a gap, the first output bus passing through the gap and being located between a bottom wall of the gap and the limiting piece.

14. The battery pack of claim 13, wherein, The first output row comprises a first part, a third part and a second part which is connected between the first part and the third part in a bent manner; wherein the first part is connected between the first group of battery cells and the second part, the second part passes through the gap, and the third part is close to the third side plate; the second part is above the first part and the third part, the second output row is on the side of the third part away from the third side plate and below the second part.

15. The battery pack of any one of claims 1-14, wherein, The top surface of the box body is in a hollowed-out arrangement.

16. The battery pack of any one of claims 1-15, wherein, The bottom plate and the side plate of the box body are in an integral forming structure.

17. The battery pack according to any one of claims 1-16, comprising a battery cell arrangement area and a wire arrangement area on both sides of the partition plate.

18. An electrical device comprising the battery pack according to any one of claims 1-17.

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