Heat dissipation reinforced lithium battery pack

Abstract

The utility model discloses a heat dissipation reinforced lithium battery pack which comprises a top battery pack cover positioned on the uppermost layer and a bottom battery pack cover positioned on the lowermost layer, and further comprises at least one middle battery pack cover positioned between the top battery pack cover and the bottom battery pack cover, the space between the top battery pack cover and the bottom battery pack cover is divided into at least two areas, namely an upper area above each middle battery pack cover and a lower area below each middle battery pack cover; the lower area is internally provided with lower battery cells and lower flow guide separators, and the lower battery cells and the lower flow guide separators are jointly mounted on the bottom battery pack cover in an array manner; upper battery cells and upper diversion separators are arranged in the upper region, and are arranged on the top battery pack cover in an array manner; and flow guide fins are arranged on the upper flow guide partition body and the lower flow guide partition body. According to the battery pack, the interval between the battery cells is reduced, and the flow guide body is arranged, so that air flow in the battery pack fully flows, and the heat dissipation capability is enhanced.

Description

Technical Field

[0001] This application relates to the technical field of batteries and energy storage, and specifically relates to a heat dissipation enhanced lithium battery pack. Background Art

[0002] A lithium battery pack is a battery pack composed of multiple lithium battery monomers in series or parallel, and usually also includes components such as a battery management system, a housing, and connecting wires. A lithium battery pack consists of a battery cell, a protection board, a housing, etc. The battery cell is the core component of the lithium battery pack. The heat dissipation means of the lithium battery pack mainly include natural heat dissipation, air-cooled heat dissipation, liquid-cooled heat dissipation, and heat pipe heat dissipation, etc. Natural heat dissipation is achieved through the heat exchange between the outer shell of the lithium battery pack and the external environment, but its heat dissipation effect is poor and cannot meet the heat dissipation requirements of high heat density lithium batteries. There are also some other forced heat dissipation methods in the prior art. For example, liquid-cooled heat dissipation is achieved by circulating coolant inside the lithium battery pack to take away heat, but its structure is complex and the cost is high. Heat pipe heat dissipation is achieved by transferring heat from the inside of the lithium battery pack to the outside through heat pipes, but its heat dissipation effect is greatly affected by the number and arrangement of heat pipes.

[0003] After retrieval, some lithium battery pack solutions with heat dissipation designs have emerged. For example, CN218472025U discloses a lithium battery pack convenient for heat dissipation, including a housing, the bottom of the housing is connected with a bottom shell, the top of the housing is connected with an upper cover, and a battery module is arranged inside the housing. The battery module includes two oppositely arranged battery cell brackets, and several battery cells are arranged between the two battery cell brackets. Connecting pieces are connected to the outside of the battery cell brackets, and heat-conducting silica gel pads are respectively connected to the outside of the two connecting pieces. Through the setting of the heat-conducting silica gel pads in the present utility model, the heat generated by the battery cells is transferred to the external environment by utilizing the high heat and insulating properties of the heat-conducting silica gel, effectively reducing the temperature inside the battery pack. Summary of the Utility Model

[0004] In view of the above problems, the technical solutions adopted by the present utility model are as follows:

[0005] A heat dissipation enhanced lithium battery pack includes a top battery pack cover located at the top layer and a bottom battery pack cover located at the bottom layer, and further includes at least one middle battery pack cover located between the top battery pack cover and the bottom battery pack cover, dividing the space between the top battery pack cover and the bottom battery pack cover into at least two regions, namely an upper region above each middle battery pack cover and a lower region below each middle battery pack cover; a lower battery cell and a lower flow guide partition are arranged in the lower region, and they are commonly installed in an array on the bottom battery pack cover; an upper battery cell and an upper flow guide partition are arranged in the upper region, and they are commonly installed in an array on the top battery pack cover; flow guide fins are arranged on the upper flow guide partition and the lower flow guide partition.

[0006] Furthermore, the top battery pack cover, the middle battery pack cover and the bottom battery pack cover are regular hexagons with the same outer contour, and seven rows of insertion holes are evenly spaced along a direction parallel to one of the sides of the regular hexagonal contour on the bottom surface of the top battery pack cover, the upper and lower surfaces of the middle battery pack cover and the top surface of the bottom battery pack cover. The insertion holes in each row are also evenly spaced, and the upper battery cells, the lower battery cells, the upper flow guide spacer and the lower flow guide spacer are installed in the insertion holes.

[0007] Furthermore, the upper flow guide spacer and the lower flow guide spacer include a cylindrical insertion head and a cylindrical insertion bottom, and their heights are the same as those of the upper battery cell and the lower battery cell. Three flow guide fins spaced 180 degrees apart are arranged between the insertion head and the insertion bottom.

[0008] Furthermore, the upper battery cells and the upper flow guide spacers in the upper region are arranged at intervals, and the lower battery cells and the lower flow guide spacers in the lower region are arranged at intervals.

[0009] Furthermore, a pole piece limiting structure is provided on the top battery pack cover, and a clearance groove is provided on the top battery pack cover, the middle battery pack cover and the bottom battery pack cover, and a first clamping structure and a second clamping structure are provided in the clearance groove, so that the top battery pack cover, the middle battery pack cover and the bottom battery pack cover can be securely buckled.

[0010] Furthermore, buckles are provided on both the first clamping structure and the second clamping structure.

[0011] Furthermore, the top battery pack cover, the middle battery pack cover and the bottom battery pack cover are provided with a plurality of through vent holes.

[0012] Furthermore, the battery cells are arranged in the upper region, and the flow guide spacers are arranged in the lower region.

[0013] Furthermore, the top battery pack cover, the middle battery pack cover and the bottom battery pack cover are provided with a pole piece structure connecting all the battery cell electrodes.

[0014] The beneficial effects of the utility model are as follows: the intervals between the battery cells are reduced and a flow guide is provided, so that the air flow inside the battery pack can flow fully, thereby enhancing the heat dissipation capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] It should be noted that the pole pieces, positive and negative electrodes, etc. connected between the battery cells in the lithium battery pack belong to well-known structures and are not closely related to the structural improvements of this application. Structures such as electrical connections are omitted in the following schematic diagrams.

[0017] Figure 1 Schematic diagram of the explosion structure of the present utility model;

[0018] Figure 2 is Figure 1 Schematic diagram of the structure in the normal state;

[0019] Figure 3 is Figure 1 Side view of the structure in;

[0020] Figure 4 is Figure 1 Top view of the structure in;

[0021] Figure 5 Layout view observed from the top of the bottommost battery cell;

[0022] Figure 6 is Figure 5 Layout view observed from the top of the next higher-level battery cell in.

[0023] Reference numerals

[0024] 1. Top battery pack cover

[0025] 2. Upper battery cell

[0026] 3. Middle battery pack cover

[0027] 4. Lower battery cell

[0028] 5. Bottom battery pack cover

[0029] 6. Upper flow guide partition

[0030] 7. Lower flow guide partition

[0031] 8. First clamping structure

[0032] 9. Second clamping structure

[0033] 10. Snap

[0034] 11. Pole piece limiting structure

[0035] 12. Relief groove

[0036] 13. Vent hole

[0037] 21. Electrode

[0038] 31. Pole piece limiting structure

[0039] 32. Relief groove

[0040] 51. Insertion hole

[0041] 52. Relief groove

[0042] 61. Insertion head

[0043] 62. Flow - guiding fin

[0044] 63. Insertion bottom

[0045] 71. Insertion head

[0046] 72. Flow - guiding fin

[0047] 73. Flow - guiding bottom

[0048] 111. Flow - guiding row

[0049] 112. Battery cell row

[0050] 211. Battery cell row

[0051] 212. Flow - guiding row Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0053] Refer to the attached Figure 1 , a heat - dissipation enhanced lithium - battery pack according to the present application includes a top battery - pack cover 1 located at the top layer and a bottom battery - pack cover 5 located at the bottom layer, and further includes at least one middle battery - pack cover 3 located between the top battery - pack cover 1 and the bottom battery - pack cover 5, dividing the space between the top battery - pack cover 1 and the bottom battery - pack cover 5 into at least two regions, namely an upper region above each middle battery - pack cover 3 and a lower region below each middle battery - pack cover 3; a lower battery cell 4 and a lower flow - guiding separator 7 are arranged in the lower region, and they are commonly installed in an array on the bottom battery - pack cover 5; an upper battery cell 2 and an upper flow - guiding separator 6 are arranged in the upper region, and they are commonly installed in an array on the top battery - pack cover 1; flow - guiding fins 72 are arranged on the upper flow - guiding separator 6 and the lower flow - guiding separator 7.

[0054] Further, the top battery pack cover 1, the middle battery pack cover 3, and the bottom battery pack cover 5 are regular hexagons with the same outer contour. On the bottom surface of the top battery pack cover 1, the upper and lower surfaces of the middle battery pack cover 3, and the top surface of the bottom battery pack cover 5, seven rows of insertion holes 51 are evenly distributed along a direction parallel to one of the sides of the regular hexagon contour, and the rows of insertion holes 51 are also evenly spaced from each other. The upper battery cells 2, the lower battery cells 4, the upper flow guide partitions 6, and the lower flow guide partitions 7 are installed in the insertion holes 51.

[0055] It is set as a hexagon here to achieve the maximum volume utilization rate, and a hexagon has six sides, which is more convenient for the inflow and outflow of air. Of course, the traditional quadrilateral can also meet the requirements.

[0056] Further, the upper flow guide partition 6 and the lower flow guide partition 7 include a cylindrical insertion head 61 and a cylindrical insertion bottom 63, the height of which is the same as that of the upper battery cells 2 and the lower battery cells 4. Between the insertion head 61 and the insertion bottom 63, three flow guide fins 62 are arranged at intervals of 180 degrees.

[0057] Further, the upper battery cells 2 and the upper flow guide partitions 6 in the upper region are arranged at intervals, and the lower battery cells 4 and the lower flow guide partitions 7 in the lower region are arranged at intervals.

[0058] Further, a pole piece limiting structure 11 is provided on the top battery pack cover 1, and a relief groove 12 is provided on the top battery pack cover 1, the middle battery pack cover 3, and the bottom battery pack cover 5. A first engaging structure 8 and a second engaging structure 9 are provided in the relief groove 12 to reliably fasten the top battery pack cover 1, the middle battery pack cover 3, and the bottom battery pack cover 5.

[0059] Further, buckles 10 are provided on both the first engaging structure 8 and the second engaging structure 9.

[0060] Further, a plurality of through ventilation holes 13 are provided on the top battery pack cover 1, the middle battery pack cover 3, and the bottom battery pack cover 5.

[0061] Generally speaking, a fan or a similar forced heat dissipation structure will be provided in a supporting manner for the battery pack, but it will not be arranged and manufactured together with the battery pack. Therefore, the possibility of the fan being arranged at various positions should be planned in the structure.

[0062] As shown in the Figures 5-6 attachment, between the battery cells and the flow guide partitions are divided into battery cell columns 112, 211 and flow guide columns 111, 212.

[0063] Further, in the position where the battery cells are arranged in the upper region, the lower region is arranged with flow guide partitions.

[0064] Furthermore, a tab structure for connecting all the cell electrodes 21 is provided on the top battery pack cover 1, the middle battery pack cover 3, and the bottom battery pack cover 5.

[0065] The principle of enhancing the heat dissipation function in this application is as follows: First, compared with the battery pack in the prior art, in this application, the positions where the battery cells are arranged are replaced with flow guide partitions. The installation dimensions of the flow guide partitions are the same as those of the battery cells, but they have no electrical function themselves and only have the function of occupying space. They are arranged at intervals with other battery cells, increasing the distance between the battery cells and improving the heat dissipation space. On the other hand, due to the setting of the ventilation holes 13, when air-cooled active heat dissipation is carried out on this battery pack, after the air flow enters the battery pack through the side and the ventilation holes 13, it is disturbed by the flow guide fins 62, enabling the air flow to fully flow inside the battery pack body and greatly improving the active heat dissipation capacity. On the other hand, because the flow guide partitions are arranged at intervals with the battery cells, if a battery cell does catch fire due to a short circuit or the like, the presence of the flow guide partitions blocks it from quickly igniting other battery cells, winning time for emergency handling.

[0066] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heat dissipation enhanced lithium battery pack, including a top battery pack cover located at the topmost layer and a bottom battery pack cover located at the bottommost layer, and further including at least one middle battery pack cover located between the top battery pack cover and the bottom battery pack cover, separating the space between the top battery pack cover and the bottom battery pack cover into at least two regions, namely an upper region above each middle battery pack cover and a lower region below each middle battery pack cover; a lower battery cell and a lower flow guiding partition are arranged in the lower region, and they are commonly installed in an array on the bottom battery pack cover; an upper battery cell and an upper flow guiding partition are arranged in the upper region, and they are commonly installed in an array on the top battery pack cover; flow guiding fins are arranged on the upper flow guiding partition and the lower flow guiding partition.

2. The heat dissipation enhanced lithium battery pack according to claim 1, wherein, The top battery pack cover, the middle battery pack cover and the bottom battery pack cover are regular hexagons with the same outer contour. On the bottom surface of the top battery pack cover, the upper and lower surfaces of the middle battery pack cover, and the top surface of the bottom battery pack cover, seven rows of insertion holes are evenly distributed at intervals along a direction parallel to one of the sides of its regular hexagon contour, and the intervals between each row of insertion holes are also evenly distributed. The upper battery cell, the lower battery cell, the upper flow guiding partition and the lower flow guiding partition are installed in the insertion holes.

3. The heat dissipation enhanced lithium battery pack according to claim 2, wherein The upper flow guiding partition and the lower flow guiding partition include a cylindrical insertion head and a cylindrical insertion bottom, and their height is the same as that of the upper battery cell and the lower battery cell. Three flow guiding fins spaced 180 degrees apart are arranged between the insertion head and the insertion bottom.

4. The heat dissipation enhanced lithium battery pack according to claim 3, wherein The upper battery cells and the upper flow guiding partitions in the upper region are arranged at intervals, and the lower battery cells and the lower flow guiding partitions in the lower region are arranged at intervals.

5. The heat dissipation enhanced lithium battery pack according to claim 4, characterized in that A pole piece limiting structure is arranged on the top battery pack cover, and relief grooves are arranged on the top battery pack cover, the middle battery pack cover and the bottom battery pack cover. A first engaging structure and a second engaging structure are arranged in the relief grooves to enable reliable buckling of the top battery pack cover, the middle battery pack cover and the bottom battery pack cover.

6. The heat dissipation enhanced lithium battery pack according to claim 5, wherein Clasps are arranged on both the first engaging structure and the second engaging structure.

7. The heat dissipation enhanced lithium battery pack according to claim 6, characterized in that, A plurality of through ventilation holes are arranged on the top battery pack cover, the middle battery pack cover and the bottom battery pack cover.

8. The heat dissipation enhanced lithium battery pack according to claim 7, characterized in that, In the position where the battery cells are arranged in the upper region, the flow guiding partitions are arranged in the lower region.

9. The heat dissipation enhanced lithium battery pack according to claim 8, characterized in that, A pole piece structure for connecting all the electrodes of the battery cells is arranged on the top battery pack cover, the middle battery pack cover and the bottom battery pack cover.

Images