A battery with high energy density and high heat dissipation efficiency

Abstract

The present invention discloses a high-energy-density, high-heat-dissipation-efficiency battery, comprising: a battery module, comprising a bracket 2 and a battery pack 3, wherein a plurality of battery packs 3 are stacked and arranged in the bracket 2, with heat sinks 4 provided between each of the stacked battery packs 3, the width of the heat sinks 4 being greater than the width of the battery packs 3; and a housing 1, wherein the housing 1 is a sealed space made of a high-thermal-conductivity material, wherein the battery module is arranged in the housing 1. The housing 1 is provided with a low-boiling-point coolant, which fills 30%-70% of the housing 1 when unheated. When heated and boiling, the coolant fills more than 90% of the housing 1 and exerts expansion pressure on the housing 1. The heat sink 4 can be made of a highly thermally conductive copper sheet or copper alloy. By filling the housing 1 with a low-boiling-point coolant and providing heat sinks 4 between each of the battery packs 3, the present invention ensures that the heat generated by the battery packs 3 during operation can be effectively transferred to the housing 1, which then transfers the heat away.

Description

Technical Field

[0001] The present invention relates to the field of unmanned aerial vehicles (UAVs), and in particular to a battery with high energy density and high heat dissipation efficiency. Background Art

[0002] Introduction to prior art: When a drone is taking off, climbing, accelerating or carrying a high load, its internal lithium-ion battery will usually discharge at a high rate to meet flight requirements. In particular, the higher the discharge rate that the drone battery can withstand, the greater its load-bearing capacity. However, high-rate discharge will generate a large amount of heat, which often causes the battery temperature to be too high and unable to work normally, and even affects the battery's cycle life. Therefore, achieving efficient heat dissipation of drone batteries is an effective means to improve the performance of drones under extreme working conditions such as high load and high wind speed. To this end, a high-load drone battery thermal management device is designed to solve the above technical problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a battery with high energy density and high heat dissipation efficiency. The specific technical solution is as follows:

[0004] A high-energy-density, high-heat-dissipation-efficiency battery comprises a battery module, comprising a bracket and battery packs. Multiple battery packs are stacked within the bracket, with heat sinks positioned between each stacked battery pack. The heat sinks are wider than the battery packs. A housing, a sealed space made of a highly thermally conductive material, houses the battery modules. The housing contains a low-boiling-point coolant. When unheated, the coolant fills 30%-70% of the housing. When heated, the coolant boils and expands, filling the housing to over 90% and exerting expansion pressure. In actual use, multiple battery modules can be connected in series. The heat sinks can be made of highly thermally conductive copper or copper alloy.

[0005] The heat sink is provided with a strip hole, one end of the strip hole is located between the battery packs, and the other end of the strip hole is located outside the battery pack, which is used to introduce coolant between the battery packs.

[0006] The side wall of the box body is configured to be pleated to increase the contact area between the side wall of the box body and the coolant and the external air.

[0007] A honeycomb support plate is provided on the outside of the box to increase the contact area between the outside of the box and the air.

[0008] The bracket includes a groove-shaped bottom, hollow side walls and a limiter. The hollow side walls are provided in two and are respectively provided on the opposite sides of the groove-shaped bottom. The limiters are provided in two and are respectively provided on the upper parts of the two sides of the hollow side walls. The two ends of the limiters are detachably connected to the two hollow side walls. The battery packs are stacked and placed on the groove-shaped bottom. The hollow side walls and the limiters are used to limit the displacement of the battery packs after stacking.

[0009] The grooved bottom, hollow sidewalls and limiters are made of high thermal conductivity materials. The side of the grooved bottom facing the battery pack is provided with thermal conductive silicone, and the side of the hollow sidewall facing the battery pack is provided with a first insulating plate.

[0010] The battery pack includes a battery body, a tab arranged above the battery body, and a neck formed at the connection position between the tab and the battery body. The thickness of the battery body is greater than the thickness of the neck, and the thickness of the neck is greater than the thickness of the tab. A limiter is arranged at the intersection of the battery body and the neck to leave a gap between the necks when the battery packs are stacked for the flow of coolant.

[0011] A second insulating plate is provided above the battery pack, and the tabs pass through the second insulating plate to prevent accidental contact of the tabs from causing a short circuit.

[0012] A conductive row is provided above the second insulating plate for connecting the stacked tabs.

[0013] The heat sink is provided with an avoidance groove-shaped bottom and an avoidance notch of a limiting part.

[0014] The above technical solution of the present invention has the following beneficial technical effects: by filling the box with low-boiling-point coolant and arranging heat sinks between the battery packs, the heat generated by the battery packs during operation can be effectively transferred to the box, and the box then transfers the heat out. Because the low-boiling-point coolant expands when heated, we do not need to fill it up when filling it with coolant, saving overall weight and achieving a lightweight effect. At the same time, the coolant brings about flow in the box when it expands, speeding up heat exchange and taking into account the corners and edges in the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the battery module of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of battery modules used in series in the present invention;

[0017] Figure 3 This is a schematic diagram of the structure in which the battery modules are connected in series and placed in a box;

[0018] Figure 4 This is a schematic diagram of the main structure of two battery packs stacked together in the present invention;

[0019] Figure 5 This is a schematic diagram of the right side structure of two battery packs stacked together in the present invention;

[0020] Figure 6 It is a structural schematic diagram of the heat sink in the present invention;

[0021] It should be noted that the tabs in the accompanying drawings are all in an unwelded state;

[0022] Among them: 1-box, 2-bracket, 21-grooved bottom, 22-hollow side wall, 23-limiting part, 3-battery pack, 31-battery body, 32-neck, 33-ear, 4-heat sink, 41-strip hole, 42-avoidance gap, 5-second insulating plate, 6-conductive bar. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0024] like Figure 1-6 As shown:

[0025] A high-energy-density, high-heat-dissipation-efficiency battery comprises a battery module comprising a support 2 and battery packs 3. Multiple battery packs 3 are stacked within the support 2. Heat sinks 4 are positioned between each stack of battery packs 3, with the width of the heat sinks 4 being greater than that of the battery packs 3. A housing 1 is an enclosed space made of a highly thermally conductive material. The battery modules are positioned within the housing 1. A low-boiling-point coolant is contained within the housing 1. When unheated, the coolant fills 30% to 70% of the housing 1. When heated, the coolant boils and expands, filling more than 90% of the housing 1 and exerting expansion pressure on the housing 1. In actual use, multiple battery modules can be connected in series. Heat sinks 4 can be made of highly thermally conductive copper or copper alloy. By filling the housing 1 with the low-boiling-point coolant and positioning the heat sinks 4 between each battery pack 3, the present invention effectively transfers heat generated by the battery packs 3 during operation to the housing 1, which then transfers the heat away. Because low-boiling-point coolant expands when heated, we don't need to fill the coolant completely, saving overall weight and achieving a lightweight effect. At the same time, the expansion of the coolant promotes flow within the box 1, accelerating heat exchange and taking into account every corner within the box 1.

[0026] The heat sink 4 is provided with a strip hole 41. One end of the strip hole 41 is located between the battery packs 3, and the other end of the strip hole 41 is located outside the battery pack 3, which is used to introduce the coolant between the battery packs 3. The side wall of the box body 1 is set to be pleated to increase the contact area between the side wall of the box body 1 and the coolant and the external air. A honeycomb support plate is provided on the outside of the box body 1 to increase the contact area between the outside of the box body 1 and the air. The bracket 2 includes a groove-shaped bottom 21, a hollow side wall 22 and a limiter 23. The hollow side wall 22 is provided in two and is respectively provided on the opposite sides of the groove-shaped bottom 21. The limiter 23 is provided in two and is respectively provided on the upper part of the two sides of the hollow side wall 22. The two ends of the limiter 23 are detachably connected to the two hollow side walls 22. The battery packs 3 are stacked and placed on the groove-shaped bottom 21. The hollow side wall 22 and the limiter 23 are used to limit the displacement of the battery packs 3 after stacking. The grooved bottom 21, hollow sidewalls 22, and stoppers 23 are made of a highly thermally conductive material. Thermally conductive silicone is applied to the side of the grooved bottom 21 facing the battery pack 3, while a first insulating plate is applied to the side of the hollow sidewalls 22 facing the battery pack 3. The battery pack 3 comprises a battery body 31, tabs 33 positioned above the battery body 31, and a neck 32 formed where the tabs 33 connect to the battery body 31. The battery body 31 is thicker than the neck 32, which in turn is thicker than the tabs 33. The stoppers 23 are positioned at the intersection of the battery body 31 and the neck 32 to allow coolant to flow between the necks 32 when the battery packs 3 are stacked. A second insulating plate 5 is positioned above the battery packs 3, with the tabs 33 extending through it to prevent accidental contact and short circuits. A conductive bar 6 is positioned above the second insulating plate 5 to connect the stacked tabs 33. The heat sink 4 has a clearance notch 42 to allow for the grooved bottom 21 and stoppers 23.

Claims

1. A high energy density and high heat dissipation efficiency battery, characterized in that: include: A battery module, comprising a bracket (2) and a battery pack (3), wherein a plurality of the battery packs (3) are stacked and arranged in the bracket (2), and heat sinks (4) are arranged between each of the stacked battery packs (3), wherein the width of the heat sinks (4) is greater than the width of the battery packs (3); A box (1), wherein the box (1) is a closed space made of a high thermal conductivity material, the battery module is arranged in the box (1), and a low-boiling-point coolant is arranged in the box (1), the coolant fills 30%-70% of the box (1) when not heated, and the coolant fills more than 90% of the box (1) when heated and boils and expands, and brings expansion pressure to the box (1); The heat sink (4) is provided with a strip hole (41), one end of the strip hole (41) is located between the two battery packs (3), and the other end of the strip hole (41) is located outside the battery pack (3), and is used to introduce the coolant between the two battery packs (3); The bracket (2) comprises a groove-shaped bottom (21), a hollow side wall (22) and a limiting member (23); the hollow side wall (22) is provided in two pieces and is respectively provided on opposite sides of the groove-shaped bottom (21); the limiting member (23) is provided in two pieces and is respectively provided on the upper parts of both sides of the hollow side wall (22); the two ends of the limiting member (23) are respectively detachably connected to the two hollow side walls (22); the battery pack (3) is stacked and placed on the groove-shaped bottom (21); the hollow side wall (22) and the limiting member (23) are used to limit the displacement of the stacked battery pack (3); The battery pack (3) comprises a battery body (31), a tab (33) arranged above the battery body (31), and a neck (32) formed at a connection position between the tab (33) and the battery body (31); the thickness of the battery body (31) is greater than the thickness of the neck (32); the thickness of the neck (32) is greater than the thickness of the tab (33); the limiting member (23) is arranged at the intersection of the battery body (31) and the neck (32) and is used to leave a gap between the two necks (32) for the flow of the coolant when the battery packs (3) are stacked.

2. The high energy density and high heat dissipation efficiency battery according to claim 1, characterized in that: The side wall of the box body (1) is configured to be corrugated, so as to increase the contact area between the side wall of the box body (1) and the coolant and the external air.

3. The high energy density and high heat dissipation efficiency battery according to claim 1, characterized in that: A honeycomb support plate is provided on the outside of the box body (1) to increase the contact area between the outside of the box body (1) and the air.

4. The high energy density and high heat dissipation efficiency battery according to claim 1, wherein: The groove-shaped bottom (21), the hollow side wall (22) and the limiter (23) are made of a high thermal conductivity material; a thermally conductive silica gel is provided on the side of the groove-shaped bottom (21) facing the battery pack (3); and a first insulating plate is provided on the side of the hollow side wall (22) facing the battery pack (3).

5. The high energy density and high heat dissipation efficiency battery according to claim 1, wherein: A second insulating plate (5) is provided above the battery pack (3), and the tabs (33) pass through the second insulating plate (5) to prevent the tabs (33) from accidentally contacting and causing a short circuit.

6. The high energy density and high heat dissipation efficiency battery according to claim 5, characterized in that: A conductive row (6) is provided above the second insulating plate (5) for connecting the stacked tabs (33).

7. The high energy density and high heat dissipation efficiency battery according to claim 1, characterized in that: The heat sink (4) is provided with an avoidance notch (42) for avoiding the groove-shaped bottom (21) and the limiting member (23).

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