battery pack

Abstract

The present invention provides a battery pack, comprising: a battery cell body, a shell, a radiator, and an upper cover. The shell surrounds a portion of the battery cell body, the radiator is disposed on the shell, and the bottom surface of the radiator rests on a busbar disposed at the upper end of the battery cell body. The radiator is in thermal contact with the module electrodes at the upper end of the battery cell body, and the upper cover is disposed on the radiator. The battery pack provided by the present invention can not only dissipate heat around the battery cell body, but also conduct heat generated by the tabs or heat conducted from the battery cell body to the tabs outwardly, thereby achieving all-round heat dissipation around the battery pack. The pack is suitable for use in drones and meets the high heat dissipation requirements of drones.

Description

Technical Field

[0001] The present invention relates to the technical field of battery heat dissipation, and in particular to a battery pack. Background Art

[0002] Drones are playing an increasingly important role in aerial photography, agriculture, surveying, monitoring, disaster relief and other fields. Drones mostly use lithium-ion battery packs to provide energy supply. The battery pack's endurance is directly related to the drone's flight time. In order to make drones have a longer flight time, drones are usually equipped with multiple batteries with large capacity. The large capacity requirement is achieved by connecting multiple battery modules in series or parallel.

[0003] During drone flight, high-power operating conditions are inevitable. For example, when a drone operates at full load for extended periods, this can cause the battery pack to overheat. As the battery pack temperature rises relative to room temperature, its lifespan is significantly reduced. Existing drone batteries have low heat dissipation efficiency and poor heat dissipation, resulting in high battery temperatures during operation.

[0004] Therefore, the heat dissipation of drone batteries has become a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0005] The present invention provides a battery pack, which can improve the heat dissipation efficiency of the battery and enhance the heat dissipation performance.

[0006] In order to achieve the above objectives, the present invention provides a battery pack comprising:

[0007] Battery cell body;

[0008] a shell, the shell surrounding a portion of the surface of the battery cell body;

[0009] a heat sink, the bottom surface of which abuts against a busbar provided at the upper end of the battery cell body, and the heat sink is in thermal contact with the module electrode at the upper end of the battery cell body;

[0010] An upper cover is arranged on the radiator.

[0011] In a battery pack provided by the present invention, the shell surrounds a portion of the battery cell body, and the heat sink is disposed on the shell. The heat sink, through thermal contact with the module electrodes of the battery cell body, achieves heat exchange between the two. It can conduct heat generated by the tabs or heat conducted from the battery cell body to the tabs outward, thereby achieving all-round heat dissipation around the battery pack, effectively improving the heat exchange efficiency between the battery pack and the external environment, improving the heat dissipation effect of the battery pack, reducing the operating temperature of the battery pack, and increasing the service life of the battery pack. This makes the battery pack provided by the present invention suitable for use in drones and can meet the high-power and high-heat dissipation requirements of drones.

[0012] In a possible implementation, a battery pack provided by the present invention further includes a plurality of first thermal pads, wherein the plurality of first thermal pads are all abutted between the lower surface of the busbar and the battery cell body.

[0013] In one possible implementation, at least one second thermal pad is provided on the busbar, the upper end of the battery cell body has a tab, and the at least one second thermal pad abuts against the tab and the heat sink.

[0014] In one possible implementation, the battery pack provided by the present invention further includes an insulating plate, wherein the insulating plate is spaced between the busbar and the radiator;

[0015] A heat-conducting medium is filled between the insulating plate and the busbar, and / or a heat-conducting medium is filled between the insulating plate and the radiator.

[0016] In one possible implementation, the battery cell body includes at least two module battery cells and a central heat conducting plate correspondingly arranged outside the at least two module battery cells.

[0017] In one possible implementation, the heat conducting plate is U-shaped, the central heat conducting plate surrounds at least three surfaces of the corresponding module battery core, and the inner surface of the central heat conducting plate is bonded to the module battery core by a thermally conductive adhesive; and / or

[0018] The central heat conducting plates of two adjacent battery core bodies are arranged opposite to each other, and the bottoms of the central heat conducting plates of the two adjacent battery core bodies are bonded together by heat conducting glue.

[0019] In one possible implementation, the module battery cell includes a plurality of sub-battery cells and a plurality of thermal conductive plates corresponding to the plurality of sub-battery cells, the plurality of sub-battery cells are arranged side by side and stacked, the thermal conductive plates surround at least three sides of the corresponding sub-battery cells, two adjacent thermal conductive plates are arranged opposite to each other, and an elastic member is also provided between the two adjacent thermal conductive plates.

[0020] In one possible implementation, the busbar is provided with a plurality of through slots, and a plurality of the second thermal pads are correspondingly embedded in the plurality of through slots provided on the busbar, and the plurality of the second thermal pads are correspondingly fitted with the tabs provided at the upper ends of the plurality of sub-cells.

[0021] In one possible implementation, the interior of the shell forms a receiving cavity for receiving the battery cell body, and the shell includes:

[0022] A bottom plate, the bottom plate being arranged on the bottom surface of the battery cell body;

[0023] A front panel, the front panel being arranged in front of the battery cell body;

[0024] A rear panel, the rear panel being arranged behind the battery cell body;

[0025] Two side panels are respectively arranged on two side surfaces of the battery cell body.

[0026] In a possible implementation, heat dissipation fins are provided on the bottom plate; and / or

[0027] At least one of the two side panels is provided with heat dissipation fins; and / or

[0028] The front panel is provided with heat dissipation fins; and / or

[0029] The rear panel is provided with heat dissipation fins.

[0030] In a possible implementation, the radiator is disposed on the housing, and a plurality of ventilation holes are provided on the radiator.

[0031] In one possible implementation, an interface is provided on one side of the upper cover.

[0032] The battery pack provided by the present invention can not only achieve heat dissipation around the battery cell body, but also conduct outward the heat generated by the tabs or the heat conducted from the battery cell body to the tabs, thereby achieving all-round heat dissipation around the battery pack, improving heat dissipation efficiency, and improving heat dissipation effect.

[0033] The battery pack provided by the present invention is provided with the first thermal pad, which is abutted between the lower surface of the busbar and the battery cell body, so that the heat generated by the battery cell body can be quickly conducted upward through the first thermal pad. The first thermal pad fills the space between the battery cell body and the top of the tab, reducing the thermal resistance of the space at this end, thereby improving the heat dissipation efficiency and the heat dissipation effect.

[0034] In the battery pack provided by the present invention, by arranging the second thermal pad on the busbar, the second thermal pad rests on the tab, so that the heat conducted from the battery cell body to the tab and the heat generated by the tab can be conducted upward through the second thermal pad and then dissipated to the outside through the radiator, thereby achieving the heat dissipation and cooling effect of the battery pack.

[0035] In the battery pack provided by the present invention, the insulating plate plays an insulating isolation effect between the busbar and the radiator, thereby improving the safety of the battery pack. By filling the heat-conducting medium, a good heat-conducting channel can be formed between the busbar and the radiator.

[0036] In the battery pack provided by the present invention, a plurality of ventilation holes are provided on the radiator. Such a structure facilitates the entry of air into the ventilation holes, especially during the flight of the UAV, which accelerates the circulation of air in the ventilation holes, removes the heat transferred from the module electrodes to the radiator, and improves the heat dissipation effect.

[0037] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by a battery pack provided by an embodiment of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0039] Figure 1 A schematic diagram of a three-dimensional exploded structure of a battery pack provided by an embodiment of the present invention;

[0040] Figure 2 The battery pack provided by the embodiment of the present invention Figure 1 The main view;

[0041] Figure 3 A schematic diagram of the three-dimensional structure of the battery cell body and the busbar installed in the battery pack according to an embodiment of the present invention;

[0042] Figure 4 A schematic top view of the busbar structure of a battery pack provided in an embodiment of the present invention;

[0043] Figure 5A schematic diagram of the three-dimensional structure of a cell body of a battery pack provided in an embodiment of the present invention;

[0044] Figure 6 A schematic diagram of the three-dimensional structure of the thermal conductive sheet and sub-cell of the battery pack provided in an embodiment of the present invention;

[0045] Figure 7 The battery pack provided by the embodiment of the present invention Figure 6 Schematic diagram of the three-dimensional structure of the sub-cell;

[0046] Figure 8 A schematic diagram of the three-dimensional structure of the front panel, rear panel, and battery cell body of a battery pack provided by an embodiment of the present invention;

[0047] Figure 9 A schematic diagram of the three-dimensional structure of a side panel of a battery pack provided in an embodiment of the present invention;

[0048] Figure 10 A schematic diagram of the three-dimensional structure of a radiator of a battery pack provided in an embodiment of the present invention;

[0049] Figure 11 A schematic diagram of another three-dimensional structure of a radiator of a battery pack provided in an embodiment of the present invention.

[0050] Description of reference numerals:

[0051] 10-battery cell body;

[0052] 11-module battery cell;

[0053] 111-sub-cell;

[0054] 112-ear;

[0055] 113-heat conducting sheet;

[0056] 114-first bent plate;

[0057] 115-second bent plate;

[0058] 12-module electrode;

[0059] 13-Central heat conducting plate;

[0060] 14-buffer block;

[0061] 15- elastic member;

[0062] 20-housing;

[0063] 21- bottom plate;

[0064] 22-side panel;

[0065] 23-Front panel;

[0066] 24- rear panel;

[0067] 25-accommodation cavity;

[0068] 30- Radiator;

[0069] 31-ventilation holes;

[0070] 32-inner fin;

[0071] 33-concave cavity;

[0072] 34-first reserved hole;

[0073] 35-second reserved hole;

[0074] 36-Mounting column;

[0075] 37-reserved slot;

[0076] 40-upper cover;

[0077] 41-Interface;

[0078] 50-insulation board;

[0079] 60-busbar;

[0080] 61-through groove;

[0081] 70-first thermal pad;

[0082] 80-Second thermal pad. DETAILED DESCRIPTION

[0083] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0084] There are two main sources of heat generation in batteries: the cell itself and the tabs. Heating in the cell itself is primarily due to the cell's internal resistance and electrochemical reactions; heating in the tabs is primarily due to the tab's own electrical resistance. Typically, the heat generated by the cell and tabs interact. Therefore, when considering battery heat dissipation, it's important to consider both the cell and tabs, while also minimizing the thermal resistance between the heat source and the cold end.

[0085] Therefore, how to rationally plan the overall structure and layout of the battery pack, and how to reduce the working temperature of the battery pack through the design of each component, are issues that need to be considered in the design process of drone batteries.

[0086] In view of the above background, the battery pack provided by the present invention has a structure that is conducive to the heat dissipation of the battery pack by simultaneously designing the position of the battery cell body and the tab, thereby greatly reducing the temperature of the battery pack during operation, so that the battery pack provided by the present invention can be suitable for use in drones and can meet the high-power and high-heat dissipation requirements of drones.

[0087] The battery pack provided by the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0088] refer to Figure 1 and Figure 2 As shown, the present invention provides a battery pack suitable for use in drones. The battery pack provided by the present invention includes: a battery cell body 10, a shell 20, a heat sink 30 and an upper cover 40. The shell 20 surrounds a portion of the surface of the battery cell body 10. The heat sink 30 is arranged on the shell 20, and the bottom surface of the heat sink 30 is against the busbar 60 arranged at the upper end of the battery cell body 10. The heat sink 30 is in thermal contact with the module electrode 12 at the upper end of the battery cell body 10, that is, the heat sink 30 and the module electrode 12 at the upper end of the battery cell body 10 can realize mutual heat transfer. The upper cover 40 is arranged on the heat sink 30.

[0089] The battery pack provided by the present invention has a housing 20 that, on the one hand, protects the battery cell body 10 and ensures a certain structural strength, and, on the other hand, serves to conduct heat and dissipate heat from the battery cell body 10. Furthermore, a heat sink 30 is provided on the housing 20. The heat sink 30, through thermal contact with the module electrodes 12 of the battery cell body 10, can conduct heat outward, thereby effectively improving heat exchange with the external environment, improving the heat dissipation effect of the battery pack, reducing the operating temperature of the battery pack, and thus increasing the service life of the battery pack. This makes the battery pack provided by the present invention suitable for use in drones, meeting the high-power and high-heat dissipation requirements of drones.

[0090] The heat sink 30 is in thermal contact with the module electrode 12 of the battery cell body 10. The heat exchange is not limited to the heat sink 30 directly contacting the module electrode 12 of the battery cell body 10. It can also be achieved by setting a second thermal pad 80 with good thermal conductivity between the heat sink 30 and the module electrode 12 of the battery cell body 10, and achieving indirect heat conduction between the heat sink 30 and the battery cell body 10 through the second thermal pad 80 to achieve heat exchange.

[0091] refer to Figure 1 and Figure 3As shown, a busbar 60 is provided at the upper end of the cell body 10. Due to the structural limitations of the cell body 10, the cell body 10 is at a distance H from the top of the tab 112. Therefore, it is necessary to reduce the thermal resistance of this distance H. The battery pack provided in this embodiment also includes a plurality of first thermal pads 70. The plurality of first thermal pads 70 are placed between the lower surface of the busbar 60 and the cell body 10, so that the heat generated by the cell body 10 can be conducted upward through the thermal conductivity of the first thermal pads 70. The first thermal pads 70 fill the space between the cell body 10 and the top of the tab 112, reducing the thermal resistance of the space at this distance H and conducting the heat of the cell body 10 upward.

[0092] refer to Figure 1 and Figure 4 As shown, at least one second thermal pad 80 is provided on the busbar 60. The upper end of the battery cell body 10 has a tab 112. The at least one second thermal pad 80 abuts against the tab 112 and the heat sink 30. Heat conducted from the battery cell body 10 to the tab 112, as well as heat generated by the tab 112, can be conducted upward through the second thermal pad 80 and then dissipated by the heat sink 30, achieving a heat dissipation and cooling effect for the battery pack.

[0093] In order to improve the heat dissipation effect of the radiator 30 , the radiator 30 may be made of a metal material, such as aluminum, which has good thermal conductivity and is light in weight.

[0094] refer to Figure 1 As shown, in one possible implementation, the battery pack provided in this embodiment further includes an insulating plate 50. The insulating plate 50 is spaced between the busbar 60 and the heat sink 30 and is located above the at least one second thermal pad 80. The insulating plate 50 provides insulation and isolation, improving the safety of the battery pack. The insulating plate 50 is made of a material with high thermal conductivity and good insulation performance, and its thickness is minimized.

[0095] It is easy to understand that the space between the insulating plate 50 and the busbar 60 is filled with a heat-conducting medium, and / or the space between the insulating plate 50 and the radiator 30 is filled with a heat-conducting medium. The heat-conducting medium can directly enter the gap between the insulating plate 50 and the busbar 60, and the heat-conducting medium can also directly enter the gap between the insulating plate 50 and the radiator 30. The heat-conducting medium can form a good heat-conducting channel between the busbar 60 and the radiator 30, thereby avoiding the effect of heat conduction being hindered and affected by the setting of the insulating plate 50.

[0096] The heat conducting medium may be thermal grease, thermal paste, etc.

[0097] The heat sink 30 primarily removes heat generated by the tabs 112, heat transferred from the cell body 10 to the tabs 112, and heat transferred from the cell body 10 via the first thermal pad 70, the second thermal pad 80, and the busbar 60. The heat sink 30 is provided with multiple ventilation holes 31 to facilitate air flow. This facilitates air flow through the ventilation holes 31, particularly during drone flight. This facilitates heat removal from the module electrodes 12 to the heat sink 30, improving heat dissipation.

[0098] In one possible implementation, reference Figure 10 and Figure 11 As shown, the side of the heat sink 30 is provided with multiple ventilation holes 31, which extend through both sides of the heat sink 30. Several inner fins 32 are disposed within the ventilation holes 31. The inner fins 32 are arranged longitudinally and spaced apart from each other, with the upper and lower ends of the inner fins 32 connected to the inner walls of the ventilation holes 31. The inner fins 32 effectively increase the heat dissipation area, allowing the air entering the ventilation holes 31 to fully and quickly remove heat from the heat sink 30.

[0099] The plurality of inner fins 32 extend from one end of at least one ventilation hole 31 to the other end of at least one ventilation hole 31, so that the air entering the ventilation hole 31 can fully contact the inner fins 32 during the circulation process, thereby improving the heat dissipation effect.

[0100] The top surface of the heat sink 30 defines a cavity 33 for accommodating the battery management system. This cavity 33 is located above and isolated from the at least one vent hole 31. A pair of first pre-set holes 34 are located within the cavity 33. Both holes extend through the bottom of the cavity 33 and are isolated from the at least one vent hole 31. These holes are used to pass wires connecting the battery pack. Heat generated by the battery management system during operation is also dissipated through the heat sink 30.

[0101] A reserved slot 37 is provided at the bottom of the heat sink 30, and a second reserved hole 35 is provided in the cavity 33. The reserved slot 37 is located between a pair of second reserved holes 35, which are isolated from the ventilation holes 31. The second reserved holes 35 are used to pass the communication lines connected to the battery.

[0102] Both ends of the radiator 30 have a pair of mounting posts 36 , the side walls of the mounting posts 36 are connected to the two end surfaces of the radiator 30 , and the upper cover 40 is connected to the mounting posts 36 at both ends of the radiator 30 by screws.

[0103] The tabs 112 are divided into positive tabs and negative tabs. The module electrode 12 is arranged on the busbar 60. The module electrode 12 is the total positive and negative poles of the battery cell body 10 and is used to output electrical energy. The module electrode 12 is electrically connected to the positive tab on the battery cell body 10 and the negative tab on the battery cell body 10.

[0104] In a possible implementation, the battery cell body 10 includes a module battery cell 11 .

[0105] In another possible implementation, reference Figure 3 and Figure 5 As shown, the cell body 10 includes at least two module cells 11 and a central heat conducting plate 13 correspondingly arranged outside the at least two module cells 11 .

[0106] In this embodiment, the cell body 10 includes two module cells 11 and two central heat conducting plates 13 disposed on the outside of the two module cells 11. Of course, in other examples, the cell body 10 may include three or more module cells 11, which is not specifically limited here.

[0107] refer to Figure 3 and Figure 5 As shown, the central heat conducting plate 13 is U-shaped and surrounds at least three sides of the corresponding module cell 11. The hottest area in the battery pack is in the middle. Discharging heat from the center of the battery pack is key to improving heat dissipation. The U-shaped central heat conducting plate 13, with its bottom passing between two adjacent module cells 11, can conduct heat from the center to the front and back sides of the module cells 11, effectively dissipating heat from the center of the battery pack.

[0108] The inner surface of the central heat conducting plate 13 is bonded to the module battery 11 by a heat conducting adhesive, which can reduce the contact thermal resistance between the central heat conducting plate 13 and the module battery 11 and improve the heat conduction effect.

[0109] The central heat conducting plates 13 of two adjacent battery cell bodies 10 are arranged opposite each other, and the bottoms of the central heat conducting plates 13 of the two adjacent battery cell bodies 10 are bonded together with thermally conductive adhesive to improve heat conduction efficiency. The bottom of the central heat conducting plate 13 is the end opposite the opening of the U-shaped central heat conducting plate 13.

[0110] refer to Figure 5 and Figure 6As shown, the module cell 11 includes a plurality of sub-cells 111 and a plurality of thermal conductive sheets 113 corresponding to the sub-cells 111. The sub-cells 111 are stacked side by side and connected in series. The thermal conductive sheets 113 surround at least three sides of the corresponding sub-cells 111. The thermal conductive sheets 113 protect the sub-cells 111 and also increase the heat dissipation rate of the sub-cells 111, accelerating the heat exchange rate between the sub-cells 111 and achieving a uniform heat distribution. This helps to even out the temperature of the sub-cells 111 as a whole, preventing the temperature of a single sub-cell 111 or a localized temperature of a sub-cell 111 from being too high, which could affect the overall safety and service life of the module cell 11.

[0111] It is easy to understand that a heat conducting sheet 113 can be provided on the outside of each sub-cell 111. The number of sub-cells 111 in the module cell 11 can be set according to the use requirements.

[0112] refer to Figure 6 and Figure 7 As shown, the thermal conductive sheet 113 surrounds at least three sides of the corresponding sub-cell 111. This can be the side surface of the sub-cell 111 with the largest area surrounded by the thermal conductive sheet 113, as well as two side surfaces connected to the side surface of the sub-cell 111 with the largest area. This forms a heat conduction channel on at least three surfaces of the sub-cell 111, which helps to uniform the temperature of the sub-cell 111 as a whole and avoid localized excessive temperatures. Since the highest temperature of the sub-cell 111 during operation is at the center of the sub-cell 111, the thermal conductive sheet 113 can also guide the heat generated at the center of the sub-cell 111 outward, improving the heat dissipation effect.

[0113] The heat conducting sheet 113 can be adhered to the sub-cell 111 using thermal adhesive, so that the heat conducting sheet 113 can be closely attached to the surface of the sub-cell 111 , which is conducive to quickly conducting the heat generated by the sub-cell 111 outward through the heat conducting sheet 113 .

[0114] In one possible implementation, the thickness of the heat conducting sheet 113 is 0.2 mm to 0.4 mm. The heat conducting sheet 113 can provide some protection for the sub-cell 111 and increase the strength of the sub-cell 111.

[0115] In one possible implementation, first bent plates 114 are connected to both sides of the thermal conductive sheet 113, and a second bent plate 115 is connected to the bottom of the thermal conductive sheet 113. This structure allows the two first bent plates 114 to be closely attached to the side surfaces of the sub-cell 111 when the thermal conductive sheet 113 is in close contact with the surface of the sub-cell 111. This structure facilitates the outward conduction of heat from the center of the sub-cell 111, improving the heat dissipation effect.

[0116] refer to Figure 1As shown, two adjacent heat conducting sheets 113 are arranged opposite to each other, and an elastic member 15 is provided between the two adjacent heat conducting sheets 113. The elastic member 15 reserves an elastic space between the two adjacent heat conducting sheets 113 to prevent the entire volume of the battery body 10 from expanding when the sub-cell 111 heats up and expands.

[0117] In a possible implementation, the elastic member 15 may be foam, thermally conductive silicone, or the like.

[0118] In particular, reference Figure 6 As shown, a buffer block 14 is provided between the bottom of the sub-cell 111 and the second bending plate 115 to play a role in buffering and reducing vibration, thereby protecting the battery pack from severe impact when it falls and affecting the service life of the battery pack.

[0119] In a possible implementation, the buffer block 14 may be made of foam or thermally conductive silicone.

[0120] refer to Figure 1 and Figure 4 As shown, due to the relatively high thermal resistance of the busbar 60, a plurality of through-slots 61 are formed on the busbar 60. A plurality of second thermal pads 80 are correspondingly embedded within the through-slots 61 formed on the busbar 60. The second thermal pads 80 are then aligned with the tabs 112 disposed at the upper ends of the plurality of sub-cells 111. This reduces the thermal resistance of the busbar 60. The second thermal pads 80 are made of a material with good thermal conductivity and a certain degree of compressibility, such as thermally conductive silicone.

[0121] refer to Figure 1 and Figure 2 As shown, the interior of the housing 20 is enclosed to form a receiving cavity 25 for receiving the battery cell body 10. The housing 20 includes: a bottom plate 21, a front panel 23, a rear panel 24 and two side panels 22. Figure 2 and Figure 8 As shown, the bottom plate 21 is arranged on the bottom surface of the battery cell body 10 , the front panel 23 is arranged in front of the battery cell body 10 , the rear panel 24 is arranged behind the battery cell body 10 , and the two side panels 22 are respectively arranged on the two side surfaces of the battery cell body 10 .

[0122] In one possible implementation, the bottom plate 21 is attached to the bottom surface of the cell body 10 via thermally conductive adhesive, the front panel 23 is attached to the front of the cell body 10 via thermally conductive adhesive, the rear panel 24 is attached to the rear of the cell body 10 via thermally conductive adhesive, and the two side panels 22 are attached to the two side surfaces of the cell body 10 via thermally conductive adhesive. In this way, the heat generated by the cell body 10 can be dissipated to the front side of the cell body 10 via the front panel 23, to the bottom of the cell body 10 via the bottom plate 21, to the rear side of the cell body 10 via the rear panel 24, and, at the same time, to both sides of the cell body 10 via the two side panels 22, thereby achieving all-round heat dissipation and improving the heat dissipation effect of the cell body 10.

[0123] In one possible implementation, reference Figure 2 and Figure 6 As shown, since the bottom surface of the battery cell body 10 is the lower end of the module battery cell 11, the bottom plate 21 is adhered to the bottom surface of the battery cell body 10 through thermal conductive adhesive, that is, the bottom plate 21 is adhered to the second bent plate 115 of each thermal conductive sheet 113 through thermal conductive adhesive, ensuring good thermal contact between the bottom plate 21 and the module battery cell 11, so that the heat generated by the sub-battery cell 111 can be conducted to the bottom plate 21 through the second bent plate 115 of the thermal conductive sheet 113 for heat dissipation.

[0124] In one possible implementation, reference Figure 1 and Figure 8 As shown, the front panel 23 is attached to the central heat conducting plate 13 of the battery cell body 10 by means of thermally conductive adhesive, ensuring good contact between the front panel 23 and the battery cell body 10, reducing the contact thermal resistance between the front panel 23 and the battery cell body 10, so that the heat generated by the module battery cell 11 can be conducted to the front panel 23 through the central heat conducting plate 13 for heat dissipation.

[0125] In one possible implementation, the rear panel 24 is adhered to the central heat conducting plate 13 of the battery cell body 10 by means of thermally conductive adhesive, ensuring good contact between the rear panel 24 and the battery cell body 10, reducing the contact thermal resistance between the rear panel 24 and the battery cell body 10, and allowing the heat generated by the module battery cell 11 to be conducted to the rear panel 24 through the central heat conducting plate 13 for heat dissipation.

[0126] In one possible implementation, reference Figure 1 and Figure 6As shown, since the two side surfaces of the battery cell body 10 are the sides of the module battery cell 11, the two side panels 22 are respectively adhered to the two side surfaces of the battery cell body 10 through thermal conductive adhesive, that is, the two side panels 22 are respectively adhered to the first bent plate 114 of each thermal conductive sheet 113 through thermal conductive adhesive, thereby ensuring good thermal contact between the two side panels 22 and the module battery cell 11, so that the heat generated by the sub-battery cell 111 can be conducted to the two side panels 22 through the first bent plate 114 of the thermal conductive sheet 113 to dissipate heat from the battery pack.

[0127] refer to Figure 1 and Figure 9 As shown, the bottom plate 21 is provided with heat dissipation fins; and / or at least one of the two side panels 22 is provided with heat dissipation fins; and / or the front panel 23 is provided with heat dissipation fins; and / or the rear panel 24 is provided with heat dissipation fins.

[0128] In one possible implementation, heat dissipation fins may be provided on the bottom plate 21, the two side panels 22, the front panel 23, and the rear panel 24. The heat dissipation fins can increase the contact area with the outside world, thereby ensuring the heat dissipation capacity of the bottom plate 21, the two side panels 22, the front panel 23, and the rear panel 24. The structure and position of the heat dissipation fins provided on the bottom plate 21, the two side panels 22, the front panel 23, and the rear panel 24 can be reasonably designed according to usage requirements and are not specifically limited here.

[0129] refer to Figure 1 and Figure 8 As shown, one side of the bottom plate 21 is connected to the lower end of a side panel 22 by screws, and the other side of the bottom plate 21 is connected to the lower end of the other side panel 22 by screws. Both sides of the front panel 23 are connected to the two side panels 22 by screws, and both sides of the rear panel 24 are also connected to the two side panels 22 by screws.

[0130] The upper cover 40 is connected to the radiator 30 by screws. A switch button can be set on the upper cover 40. An interface 41 is set on one side of the upper cover 40. The interface 41 is connected to the battery management system set in the radiator 30. The radiator 30 can also dissipate heat for the battery management system and the interface 41 set in the radiator 30.

[0131] refer to Figure 6 and Figure 7 As shown, in a battery pack provided by an embodiment of the present invention, the assembly of the module cell 11 can be performed by first sticking a thermal conductive sheet 113 on the outside of the sub-cell 111 using thermal conductive adhesive, and then stacking multiple sub-cells 111 side by side in sequence.

[0132] refer to Figure 5As shown, the assembly of the cell body 10 can be performed by first setting a central heat conducting plate 13 on the outer side of the assembled module cell 11, so that the module cell 11 is located between the two side surfaces of the central heat conducting plate 13, and then placing the two central heat conducting plates 13 opposite to each other, and bonding the bottoms of the two adjacent central heat conducting plates 13 by thermal adhesive.

[0133] refer to Figure 1 and Figure 8 As shown, the assembly of the battery pack can be as follows: first, the front of the battery cell body 10 is bonded to the front panel 23 by thermal conductive glue, the two side surfaces of the battery cell body 10 are bonded to the two side panels 22 by thermal conductive glue respectively, the front panel 23 is fixedly connected to the two side panels 22 by screws, and then the back of the battery cell body 10 is bonded to the rear panel 24 by thermal conductive glue, the rear panel 24 and the two side panels 22 are fixedly connected by screws, and then the bottom surface of the battery cell body 10 is bonded to the bottom plate 21 by thermal conductive glue, and then the bottom plate 21 and the two side panels 22 are fixedly connected by screws, refer to Figure 1 and Figure 10 As shown, the upper ends of the two side panels 22 are finally connected to the pair of mounting posts 36 of the heat sink 30 using screws. Applying thermal adhesive first and then connecting with screws ensures good thermal conductivity while also ensuring the stability of the connections between the base plate 21, the two side panels 22, the front panel 23, and the rear panel 24.

[0134] The thermally conductive adhesive is not limited to one or more of epoxy resin thermally conductive adhesive, silicone thermally conductive adhesive, polyurethane thermally conductive adhesive or silicone adhesive.

[0135] A battery pack provided in this embodiment takes into account the heat dissipation of the battery cell body 10 and the tab 112 at the same time. It not only achieves good heat dissipation by utilizing the front, back, bottom and two side surfaces of the battery cell body 10, but also fully utilizes the top of the battery cell body 10 for heat dissipation. By conducting the heat at the center of the battery cell body 10 outward and the heat generated by the tab 112 upward, the heat dissipation of the top of the battery cell body 10 is achieved through the radiator 30, which greatly improves the heat dissipation effect of the battery pack and improves the safety and service life of the battery pack.

[0136] This embodiment provides a battery pack that improves heat dissipation, effectively reducing the temperature of the battery pack during high-discharge-rate operation. Based on an 11.5C discharge rate, a 7C charge rate, an 8-minute charge / discharge time, and eight cycles, the temperature can be reduced by 15°C to 20°C, demonstrating significant heat dissipation and cooling effects.

[0137] This embodiment provides a battery pack that takes heat dissipation from the tab 112 into account. Heat generated by the tab 112 itself, as well as heat conducted from the cell body 10 to the tab 112, is dissipated outward, effectively reducing the tab 112 temperature. Based on an 11.5C discharge rate, a 7C charge rate, an 8-minute charge / discharge period, and 8 cycles, the tab 112 temperature can be reduced by approximately 30°C, demonstrating significant heat dissipation and cooling effects.

[0138] This embodiment provides a battery pack that, while providing a heat dissipation design, also ensures a low overall weight. For example, a 51.8V 29Ah battery can keep the overall weight under 11kg, reducing the weight burden on drones during flight.

[0139] It should be noted here that the numerical values ​​and numerical ranges involved in this application are approximate values. Due to the influence of the manufacturing process, there may be a certain range of errors. Those skilled in the art may consider this part of the error to be negligible.

[0140] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside", "axial", "circumferential" and the like used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or component referred to must have a specific orientation, a specific structure and operation, and therefore cannot be understood as limiting the present invention.

[0141] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0142] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections, or communication; direct or indirect connections through an intermediate medium, or internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0143] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery pack, characterized in that: include: Battery cell body (10); a shell (20), the shell (20) surrounding a portion of the surface of the battery cell body (10); a heat sink (30), wherein the bottom surface of the heat sink (30) abuts against a busbar (60) provided at the upper end of the battery cell body (10), and the heat sink (30) is in thermal contact with the module electrode (12) at the upper end of the battery cell body (10); an upper cover (40), the upper cover (40) being arranged on the radiator (30); The battery cell body (10) comprises at least two module battery cells (11) and a central heat conducting plate (13) correspondingly arranged outside the at least two module battery cells (11); The central heat conducting plate (13) is U-shaped, and the central heat conducting plate (13) surrounds at least three surfaces of the corresponding module battery core (11), and the inner surface of the central heat conducting plate (13) and the module battery core (11) are bonded by heat-conducting adhesive; and / or The central heat conducting plates (13) of two adjacent battery cell bodies (10) are arranged opposite to each other, and the bottoms of the central heat conducting plates (13) of the two adjacent battery cell bodies (10) are bonded together by heat conducting adhesive; The bottom of the central heat conducting plate (13) is an end opposite to the opening of the U-shaped central heat conducting plate (13); The side of the radiator (30) is provided with a plurality of ventilation holes (31), and the ventilation holes (31) penetrate the two side surfaces of the radiator (30); the top surface of the radiator (30) is provided with a cavity (33) for accommodating a battery management system, and the cavity (33) is located above at least one of the ventilation holes (31) and is isolated from the at least one of the ventilation holes (31); and a plurality of inner fins are provided in the plurality of ventilation holes (31).

2. The battery pack according to claim 1, wherein: It also includes a plurality of first thermally conductive pads (70), each of which is in contact with the lower surface of the busbar (60) and between the battery cell body (10).

3. The battery pack according to claim 2, wherein: A plurality of second thermal pads (80) are provided on the busbar (60), the upper end of the battery cell body (10) has a tab (112), and the plurality of second thermal pads (80) abut against the tab (112) and the heat sink (30).

4. The battery pack according to claim 3, wherein: The module battery cell (11) comprises a plurality of sub-battery cells (111) and a plurality of heat conducting sheets (113) corresponding to the plurality of sub-battery cells (111). The plurality of sub-battery cells (111) are arranged in a stacked manner side by side. The heat conducting sheets (113) surround at least three sides of the corresponding sub-battery cells (111). Two adjacent heat conducting sheets (113) are arranged opposite to each other, and an elastic member (15) is further provided between the two adjacent heat conducting sheets (113).

5. The battery pack according to claim 4, characterized in that: The busbar (60) is provided with a plurality of through slots (61), and the plurality of second thermal pads (80) are correspondingly embedded in the plurality of through slots (61) provided on the busbar (60), and the plurality of second thermal pads (80) are correspondingly fitted with the tabs (112) provided at the upper ends of the plurality of sub-cells (111).

6. The battery pack according to any one of claims 1 to 5, characterized in that: It also includes an insulating plate (50), wherein the insulating plate (50) is spaced between the busbar (60) and the radiator (30); A heat-conducting medium is filled between the insulating plate (50) and the busbar (60), and / or a heat-conducting medium is filled between the insulating plate (50) and the radiator (30).

7. The battery pack according to any one of claims 1 to 5, characterized in that: The interior of the shell (20) is enclosed to form a receiving cavity (25) for receiving the battery cell body (10), and the shell (20) comprises: A bottom plate (21), the bottom plate (21) being arranged on the bottom surface of the battery cell body (10); A front panel (23), the front panel (23) being arranged in front of the battery cell body (10); a rear panel (24), the rear panel (24) being arranged behind the battery cell body (10); Two side panels (22), the two side panels (22) are respectively arranged on two side surfaces of the battery cell body (10).

8. The battery pack according to claim 7, characterized in that: The bottom plate (21) is provided with heat dissipation fins; and / or At least one of the two side panels (22) is provided with heat dissipation fins; and / or The front panel (23) is provided with heat dissipation fins; and / or The rear panel (24) is provided with heat dissipation fins.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The radiator (30) is arranged on the housing (20).

10. The battery pack according to any one of claims 1 to 4, characterized in that: An interface (41) is provided on one side of the upper cover (40).

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