Battery module, energy storage battery system and high-altitude solar aircraft

Abstract

The invention relates to the technical field of aviation aircrafts, and discloses a battery module, an energy storage battery system and a high-altitude solar aircraft, and the module comprises a battery assembly which comprises a plurality of battery units arranged along a first direction; the two end plates are respectively positioned on two sides of the battery assembly along the first direction; the two side plates are respectively positioned on two sides of the battery assembly along a second direction; a busbar mounted on the side plate; and the two insulating sheets are respectively positioned on two sides of the battery assembly along the third direction. When the battery module is assembled, a mounting frame does not need to be arranged for each battery cell, the whole assembly of the battery module can be realized only by utilizing a mode that the two end plates and the two side plates are encircled to form the whole frame and then are matched with the two insulating sheets, and the whole light weight of the battery module is realized by reducing mounting accessories; therefore, the overall specific energy and the grouping rate of the battery module are improved, and the wind-resistant flying capability of the high-altitude solar aircraft provided with the battery module at night can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation aircraft, and in particular to a battery module, an energy storage battery system and a high-altitude solar aircraft. Background Art

[0002] High-altitude solar aircraft can stay in the air for a long time at the stratosphere. They use a circulating energy system composed of a solar cell system and an energy storage battery system to provide power.

[0003] During the day, the solar cell system converts solar energy into electricity for the high-altitude solar aircraft to fly, and stores the excess electricity through the energy storage battery to provide energy for night flight, thereby achieving long-term day and night cycle flight. Since the high-altitude solar aircraft is powered by the energy storage battery system at night, the power is limited, and the energy storage battery system cannot be charged at night, the high-altitude solar aircraft's wind resistance flight capability at night will be greatly affected by the insufficient working capacity of the energy storage battery system.

[0004] Therefore, how to improve the wind-resistant flight capability of high-altitude solar-powered aircraft at night has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] The purpose of the present invention is to at least solve the technical problem of how to improve the wind-resistant flying ability of high-altitude solar-powered aircraft at night. This purpose is achieved through the following technical solutions:

[0006] In a first aspect, the present invention proposes a battery module suitable for an energy storage battery system of a high-altitude solar aircraft, characterized in that the battery module comprises: a battery assembly, comprising a plurality of battery cells arranged along a first direction, the battery cell comprising at least one battery cell, both sides of the battery cell along a second direction being the pole ear sides of the battery cell, and the second direction being perpendicular to the first direction; two end plates, respectively located on both sides of the battery assembly along the first direction, each end plate being fixedly connected to the battery assembly; two side plates, respectively located on both sides of the battery assembly along the second direction, the side plates being used to isolate all pole ears on the pole ear side corresponding to the side plate from the outside of the battery assembly; a bus bar, connected to a side plate, the bus bar being used to connect a plurality of battery cells; and two insulating sheets, respectively located on both sides of the battery assembly along a third direction, each insulating sheet being fixedly connected to the battery assembly, and the third direction being perpendicular to the first direction / second direction in pairs.

[0007] This battery module does not need to equip each battery cell with a mounting frame like the traditional battery module assembly method. It only needs to use two end plates and two side plates to form an overall frame and then cooperate with two insulating sheets to realize the assembly of the battery module as a whole. By reducing the installation accessories to achieve the overall lightweight of the battery module, the overall specific energy and grouping rate of the battery module are improved. Therefore, when this battery module is configured in the energy storage battery system of the high-altitude solar aircraft, the working capacity of the energy storage battery system is enhanced due to the improvement of the overall specific energy and grouping rate of the battery module, which can further improve the wind resistance flying ability of the high-altitude solar aircraft at night.

[0008] In some embodiments of the present invention, the battery module further includes a temperature control mechanism, and the temperature control mechanism is used to adjust the temperature of the battery assembly.

[0009] In some embodiments of the present invention, the temperature control mechanism includes two heating films. Along the third direction, the two heating films are respectively located on both sides of the battery assembly, and the two heating films and the two insulating sheets are arranged in a one-to-one correspondence; in a group of corresponding heating films and insulating sheets, along the third direction, the insulating sheet is located on the side of the heating film away from the battery assembly.

[0010] In some embodiments of the present invention, the battery unit includes two battery cells arranged along a first direction, and a temperature control plate is provided between the two battery cells, and the temperature control plate is used to transfer heat generated by the heating film to the two battery cells.

[0011] In some embodiments of the present invention, the battery module also includes two insulating films. Along the third direction, the two insulating films are respectively located on both sides of the battery assembly, and the two insulating films are arranged in a one-to-one correspondence with the two heating films; in a group of corresponding insulating films and heating films, the insulating film is attached to the battery assembly, and along the third direction, the heating film is located on the side of the insulating film away from the battery assembly.

[0012] In some embodiments of the present invention, the battery cell further comprises a filler, and along a first direction, the filler is fitted with a battery cell adjacent to the filler itself, and the filler can be compressed and expanded along the first direction.

[0013] In some embodiments of the present invention, both the end plates and the side plates are non-metal composite plates.

[0014] In some embodiments of the present invention, the battery module further includes a restraining band for limiting the expansion of the battery cell. The restraining band is an annular structure, and the inner wall of the restraining band is in contact with the two end plates and the two insulating sheets.

[0015] In a second aspect, the present invention provides an energy storage battery system, which includes a plurality of any of the above-mentioned battery modules.

[0016] In a third aspect, the present invention proposes a high-altitude solar aircraft, which includes a solar cell system and the above-mentioned energy storage battery system, and the solar cell system is used to supply power to the energy storage battery system.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the structure of a battery module provided by an embodiment of the present invention;

[0020] Figure 2 An exploded diagram of the structure of a battery module provided by an embodiment of the present invention;

[0021] Figure 3 An exploded diagram of the structure of a battery cell in a battery module provided in an embodiment of the present invention.

[0022] The reference numerals are as follows:

[0023] 100. Battery module;

[0024] 10. Battery unit; 101. Battery core; 102. Temperature control plate; 1021. First plate; 1022. Second plate; 103. Filler;

[0025] 20. End plate;

[0026] 30. Side panels;

[0027] 40. Bus;

[0028] 50. Insulation sheet;

[0029] 60. Heating film;

[0030] 70. Insulating film;

[0031] 80. Restraint belt. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0034] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0035] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0036] Figure 1 A schematic diagram of the structure of a battery module provided by an embodiment of the present invention; Figure 2 An exploded diagram of the structure of a battery module provided by an embodiment of the present invention; Figure 3 The structure of the battery unit in the battery module provided by the embodiment of the present invention is exploded; Figures 1 to 3 As shown, an embodiment of the present invention provides a battery module 100, which is suitable for an energy storage battery system of a high-altitude solar aircraft, and is characterized in that the battery module 100 includes: a battery assembly, including a plurality of battery units 10 arranged along a first direction, the battery unit 10 includes at least one battery cell 101, and the two sides of the battery cell 101 along a second direction are the pole ear sides of the battery cell 101, and the second direction is perpendicular to the first direction; two end plates 20, along the first direction, the two end plates 20 are respectively located on both sides of the battery assembly, and each end plate 20 is connected to the battery assembly The battery assembly is fixedly connected to the battery assembly; two side plates 30, along the second direction, the two side plates 30 are respectively located on both sides of the battery assembly, the side plates 30 are used to isolate all the pole ears on the pole ear side corresponding to the side plates 30 from the outside of the battery assembly; a bus 40, connected to one side plate 30, the bus 40 is used to connect multiple battery cells 10; and two insulating sheets 50, along the third direction, the two insulating sheets 50 are respectively located on both sides of the battery assembly, each insulating sheet 50 is fixedly connected to the battery assembly, and the third direction is perpendicular to the first direction / the second direction in pairs.

[0037] In order to more clearly understand the structure of the battery module 100, the directions described above are explained below: the first direction is the width direction of the battery module 100, the second direction is the length direction of the battery module 100, and the third direction is the height direction of the battery module 100. Figures 1 to 3 The direction shown by the double-headed arrow.

[0038] Moreover, the end plate 20 can be connected to the battery assembly by bonding, which is reliable and easy to operate. Similarly, the insulating sheet 50 can also be connected to the battery assembly by bonding. It should be noted that along the third direction, the positive projection of the insulating sheet 50 on the battery assembly should cover the entire battery assembly, that is, the insulating sheet 50 can completely isolate the battery assembly from the outside in the third direction. Figure 1 As shown, in Figure 1 In the angle shown, the battery components in the battery module 100 are completely blocked by the insulating sheet 50 in the third direction, thereby ensuring the insulation of the battery module 100 as a whole; similarly, the end plate 20, the side plate 30 and the bus 40 should also be able to completely isolate the battery components from the outside (i.e., maintain insulation from the outside) in the first direction and the second direction, thereby further ensuring the insulation of the battery module 100 as a whole.

[0039] In addition, it is easy to understand that the side of the battery cell 101 provided with the pole ear is the pole ear side of the battery cell 101, and welding positions for welding the bus 40 and the pole ear should be reserved on the side plate 30 to facilitate the series or parallel connection of multiple battery cells 101 through the bus 40.

[0040] In addition, an insulating layer (not shown in the figure) may be provided on the side of the busbar 40 away from the battery assembly. The insulating layer is mainly used to insulate the welding position of the pole ear (i.e., the welding position reserved on the side plate 30, where the connection point of the busbar 40 and the pole ear of the battery cell 101 are welded and current flows) from the outside world, so as to improve the insulation effect between the battery module 100 as a whole and the outside world, and prevent the internal circuit of the battery module 100 from being disordered. It is easy to understand that there can be two insulating layers. For the side plate 30 without the busbar 40 installed, another insulating layer can be provided on the side of the side plate away from the battery assembly. The insulating layer can also play the role of insulating the pole ear on the other side of the battery assembly (i.e., the pole ear on the side without the busbar 40 installed) from the outside world. Therefore, an insulating layer can be provided on both outermost sides of the battery module 100 along the second direction to further improve the insulation effect between the battery module 100 as a whole and the outside world.

[0041] In the present embodiment, the battery module 100 does not need to be equipped with a mounting frame for each battery cell 101 as in the conventional assembly method of the battery module 100. The battery module 100 can be assembled as a whole by using two end plates 20 and two side plates 30 to enclose an overall frame and then cooperate with two insulating sheets 50. The battery module 100 is made lighter as a whole by reducing the number of mounting accessories, thereby improving the overall specific energy and grouping rate of the battery module 100.

[0042] Therefore, when this battery module 100 is configured in the energy storage battery system of a high-altitude solar aircraft, the working capacity of the energy storage battery system is enhanced due to the improvement of the overall specific energy and grouping rate of the battery module 100, thereby improving the wind-resistant flight capability of the high-altitude solar aircraft at night.

[0043] According to an optional embodiment of the present invention, the battery module 100 further includes a temperature control mechanism, which is used to adjust the temperature of the battery assembly.

[0044] In the present embodiment, it can be understood that when the battery module 100 is in operation, under the influence of its internal chemical reaction or the external ambient temperature, the temperature of the battery cell 101 located inside the battery module 100 is usually not maintained in a stable range, and the battery cell 101 has an optimal working temperature range. When the temperature of the battery cell 101 is too high or too low (that is, the temperature of the battery cell 101 is lower than the lowest value of the optimal working temperature range, or the temperature of the battery cell 101 is higher than the highest value of the optimal working temperature range), it is necessary to adjust the temperature of the battery cell 101 so that the battery module 100 is in the best performance operating state.

[0045] Specifically, refer to Figure 2 Taking the heating and regulation of the battery cell 101 as an example, the temperature control mechanism includes two heating films 60. Along the third direction, the two heating films 60 are respectively located on both sides of the battery assembly, and the two heating films 60 and the two insulating sheets 50 are arranged in a one-to-one correspondence; in a group of corresponding heating films 60 and insulating sheets 50, along the third direction, the insulating sheet 50 is located on the side of the heating film 60 away from the battery assembly.

[0046] In this embodiment, when the temperature of the battery cell 101 is lower than the lowest value of the temperature range of the optimal working state, the battery cell 101 in each battery unit 10 needs to be heated, and at this time, the heat can be transferred to the battery cell 101 in each battery unit 10 through the heating film 60. It is easy to understand that along the third direction, the insulating sheet 50 is located on the side of the heating film 60 away from the battery assembly, that is, the heating film 60 is arranged on the inner side of the insulating sheet 50 corresponding to the heating film 60 itself relative to the battery assembly, so that the insulation effect of ensuring the overall battery module 100 and the outside world can be achieved.

[0047] It should be noted that the cooling control of the battery cell 101 is the same as the above-mentioned heating control. For example, the heating film 60 can be replaced with a cooling plate. When the temperature of the battery cell 101 is higher than the highest value of the optimal working temperature range, the cooling effect of the cooling plate can be used to cool the battery cell 101 in each battery unit 10. The specific process will not be repeated here.

[0048] like Figure 3As shown, according to an optional embodiment of the present invention, the battery unit 10 includes two battery cells 101 arranged along a first direction, and a temperature control plate 102 is provided between the two battery cells 101 , and the temperature control plate 102 is used to transfer the heat generated by the heating film 60 to the two battery cells 101 .

[0049] Among them, the temperature control plate 102 in each battery unit 10 can be fitted with both battery cells 101. It is easy to understand that in a battery unit 10, the assembly relationship between the temperature control plate 102 and the battery cell 101 is a face-to-face fit. In this way, while being able to improve the overall integration and stability of the battery module 100, it can also simplify the assembly steps (that is, the temperature control plate 102 and the battery cells 101 on both sides of it can be tightly fitted with each other, without the need for other installation steps), and because the surface-to-surface contact area is large, the efficiency of heat transfer (that is, heat is ultimately transferred from the heating film 60 to the battery cell 101 through the temperature control plate 102) can also be increased.

[0050] In the present embodiment, since the existing battery cell 10 is usually equipped with multiple (at least three) battery cells 101 in one battery cell 10, if a temperature control plate 102 is to be set in the battery cell 10 to transfer heat and thus achieve the effect of temperature control of the battery assembly, a temperature control plate 102 needs to be set between every two adjacent battery cells 101. In this way, the ratio of the number of temperature control plates 102 to the battery cells 101 in the battery cell 10 will be very large (since there are at least three battery cells 101 in the battery cell 10, and in order to satisfy the requirement of setting a temperature control plate 102 between two adjacent battery cells 101, there are at least two temperature control plates 102 in the battery cell 10, that is, the ratio of the number of temperature control plates 102 to the battery cells 101 in the battery cell 10 will be at least greater than 2:3).

[0051] Specifically, a battery unit 10 is equipped with ten battery cells 101. If the temperature of the battery assembly is to be controlled, the temperature control plate 102 needs to be able to transfer heat to each battery cell 101. Therefore, a temperature control plate 102 needs to be set between each two adjacent battery cells 101. Therefore, the battery unit 10 needs to be equipped with nine temperature control plates 102, that is, the ratio of the number of temperature control plates 102 to the battery cells 101 in the battery unit 10 is 9:10; similarly, if a battery unit 10 is equipped with twenty battery cells 101, the battery unit 10 needs to be equipped with nineteen temperature control plates 102, then the ratio of the number of temperature control plates 102 to the battery cells 101 in the battery unit 10 is 19:20. And so on, the other solutions of configuring a larger number of battery cells 101 in a battery unit 10 are not illustrated here.

[0052] The reason why only two battery cells 101 and one temperature control plate 102 are provided in one battery unit 10 in this embodiment is to control the ratio of the number of temperature control plates 102 to the battery cells 101 in the battery unit 10, that is, to ensure that the ratio of the number of battery cells 101 to the number of temperature control plates 102 in each battery unit 10 is 1:2, and the ratio of the number of temperature control plates 102 to the battery cells 101 is significantly reduced.

[0053] It is easy to understand that when the ratio of the number of temperature control plates 102 and battery cells 101 in each battery unit 10 is the same, no matter how many battery cells 101 are required for the battery module 100, increasing or decreasing the number of battery units 10 will not affect the ratio of the number of all temperature control plates 102 and battery cells 101 inside the battery module 100.

[0054] Therefore, when the number of battery cells 101 required for the battery module 10 is the same, the arrangement of the present embodiment can significantly reduce the number of temperature control plates 102, so as to further achieve the overall lightweight of the battery module 100, thereby more effectively improving the overall specific energy and grouping rate of the battery module 100. Furthermore, when such a battery module 100 is configured in the energy storage battery system of a high-altitude solar aircraft, due to the further improvement in the overall specific energy and grouping rate of the battery module 100, the working capacity of the energy storage battery system is further enhanced, thereby being able to further improve the wind-resistant flight capability of the high-altitude solar aircraft at night.

[0055] like Figure 2 As shown, according to an optional embodiment of the present invention, the battery module 100 also includes two insulating films 70. Along the third direction, the two insulating films 70 are respectively located on both sides of the battery assembly, and the two insulating films 70 and the two heating films 60 are arranged in a one-to-one correspondence; in a group of corresponding insulating films 70 and heating films 60, the insulating film 70 is attached to the battery assembly, and along the third direction, the heating film 60 is located on the side of the insulating film 70 away from the battery assembly.

[0056] Among them, along the third direction, the positive projection of the insulating film 70 on the battery assembly should cover the entire battery assembly, that is, the insulating film 70 can completely isolate the battery assembly from the outside in the third direction, thereby further ensuring the overall insulation of the battery module 100.

[0057] In addition, the insulating film 70 can be bonded to the battery assembly, and the bonding method is reliable and easy to operate.

[0058] In this embodiment, the provision of the insulating film 70 can prevent the heating film 60 from being electrically connected to the battery assembly, thereby preventing the circuit inside the battery module 100 from being disordered, thereby ensuring the working efficiency of the heating film 60 and the battery unit 10 .

[0059] Specifically, continue to refer to Figure 2And also refer to Figure 3 The temperature control plate 102 may include a first plate 1021 and a second plate 1022 connected to the first plate 1021, the first plate 1021 and the second plate 1022 are perpendicular to each other, the first plate 1021 and the two adjacent battery cells 101 are parallel to each other and tightly fitted (that is, the first plate 1021 and the battery cells 101 are in surface-to-surface contact), and the second plate 1022, the heating film 60 and the insulating film 70 are parallel to each other. In this way, the heat transferred by the heating film 60 can be transferred to the first plate 1021 through the second plate 1022, and then transferred to the two adjacent battery cells 101.

[0060] Since the area corresponding to the second plate 1022 and the heating film 60 is larger, it is equivalent to heat being transferred between the surface (the surface of the heating film 60) and the surface (the surface of the second plate 1022). Although the insulating film 70 is between the heating film 60 and the second plate 1022, due to the thin thickness of the insulating film 70, it only plays an insulating role and has little effect on heat transfer. Therefore, after the heat is transferred from the heating film 60, it is first transferred to the second plate 1022 through the surface (the surface of the heating film 60) and the surface (the surface of the second plate 1022), and then the heat is transferred inside the temperature control plate 102 (that is, the heat is transferred from the second plate 1022 to the first plate 1021). Finally, the heat is transferred from the first plate 1021 again through the surface (the surface of the first plate 1021) and the surface (the surface of the battery cell 101), and the heat is finally transferred to the battery cells 101 located on both sides of the first plate 1021 in the second direction.

[0061] Therefore, the arrangement of the temperature control plate 102 including the first plate 1021 and the second plate 1022 connected to the first plate 1021 can improve the efficiency of heat being ultimately transferred from the heating film 60 to the battery cell 101 .

[0062] In addition, continue to refer to Figure 3 , the temperature control plate 102 may be provided with two second plates 1022, that is, a second plate 1022 is provided on both sides of the first plate 1021 along the third direction; it is easy to understand that in this arrangement, the two heating films 60 located on both sides of the battery assembly along the third direction can transfer heat to the battery cell 101 through two surface-to-surface heat transfers. Therefore, this arrangement can further increase the surface area of ​​contact between adjacent components during the heat transfer process, thereby further increasing the efficiency of heat transfer from the heating film 60 to the battery cell 101.

[0063] For reference Figure 2 and Figure 3According to an optional embodiment of the present invention, the battery cell 10 further includes a filler 103, and along a first direction, the filler 103 and the battery cell 101 adjacent to the filler 103 itself are fitted, and the filler 103 can be compressed and expanded along the first direction.

[0064] Among them, the filler 103 can be made of a relatively soft material with elastic deformation characteristics such as foam or sponge, so as to ensure that it can be compressed and expanded along the first direction while also protecting the battery cell 101, thereby effectively reducing the probability of damage to the battery cell 101 due to bumps. It should be noted that the material of the filler 103 in this embodiment is only an example. Under actual working conditions, the material of the filler 103 can be selected according to actual needs, as long as the filler 103 can be compressed and expanded along the first direction, without specific limitation.

[0065] In the present embodiment, since the plurality of battery cells 10 are arranged along the first direction during assembly, it is easy to understand that, in order to improve the overall integration of the battery module 100, the plurality of battery cells 10 should be arranged in pairs; in this way, when the assembly is completed, a filler 103 will be fitted on a side plate 30 along the first direction of each battery cell 101, and when the battery cell 101 expands during charging, the filler 103 is squeezed and compressed by the battery, and when the battery shrinks during discharge, the filler 103 will gradually expand to restore its original state due to the decrease in the pressure received.

[0066] Therefore, the setting of the filler 103 can maintain the overall size of the battery module 100 in the first direction, reduce the deformation of the structural parts in the battery module 100 due to squeezing during the charging and discharging process of the battery cell 101, and improve the service life of the battery module 100 to a certain extent.

[0067] According to an optional embodiment of the present invention, the end plate 20 and the side plate 30 are both non-metal composite material plates.

[0068] The non-metal composite material plate is an end plate 20 or a side plate 30 made of a non-metal composite material, and the type of the non-metal composite material can be resin or carbon fiber. It should be noted that the type of the non-metal composite material in this embodiment is only an example. In actual working conditions, the type of the non-metal composite material can be selected according to actual needs, as long as it has the characteristics of strong insulation and light weight, and is not specifically limited.

[0069] In this embodiment, the non-metal composite material has the characteristics of high insulation and light weight. The high insulation can further ensure the insulation between the battery module 100 as a whole and the outside. The light weight can further achieve the lightweight of the battery module 100 as a whole, thereby further improving the specific energy and grouping rate of the battery module 100 as a whole.

[0070] Therefore, it is easy to understand that when this battery module 100 is configured in the energy storage battery system of a high-altitude solar aircraft, the working capacity of the energy storage battery system can be further enhanced due to the further improvement of the overall specific energy and grouping rate of the battery module 100, thereby further improving the wind-resistant flight capability of the high-altitude solar aircraft at night.

[0071] refer to Figure 1 and Figure 2 According to an optional embodiment of the present invention, the battery module 100 further includes a restraining band 80 for limiting the expansion of the battery cell 101 . The restraining band 80 is an annular structure, and the inner wall of the restraining band 80 is in contact with the two end plates 20 and the two insulating sheets 50 .

[0072] Among them, it is easy to understand that the overall length of the restraint belt 80 (i.e., the circumference of the annular structure) should be set to be adjustable. In this way, the size of the restraint belt 80 can be adjusted according to the overall size of the battery module 100, thereby more reliably ensuring the overall stability of the battery module 100 in the first direction and the third direction, and improving the use scenarios of the restraint belt 80.

[0073] In this embodiment, the following Figures 1 to 3 , a complete and detailed description of the assembly process of the battery module 100 is given:

[0074] First, refer to Figure 3 , assemble the temperature control plate 102 between the two battery cells 101 along the first direction, make the first plate 1021 of the temperature control plate 102 and the two battery cells 101 parallel to each other and fit tightly, make the second plate 1022 of the temperature control plate 102 be located on one side of the battery cell 101 along the third direction, then assemble the filler 103 to the side of a battery cell 101 away from the temperature control plate 102 along the first direction, and then the battery unit 10 is assembled; repeat the above steps to assemble multiple (the specific number depends on the requirements of the battery module 100) battery cells 10.

[0075] Next, refer to Figure 2 , stack multiple battery cells 10 in sequence between the two end plates 20 along the first direction to complete the stacking of the battery assembly, then adjust the length of the restraining band 80 according to the overall size of the battery module 100 in the first direction and the third direction, and fit the inner wall of the restraining band 80 with the two end plates 20 and the two insulating sheets 50 to provide an initial pre-tightening force for the battery cell 101, that is, to achieve the overall fastening of the battery module 100 in both the first direction and the third direction.

[0076] Then, continue to refer to Figure 2, along the second direction, the side plates 30 are respectively installed on both sides of the battery assembly. Specifically, the first side with the busbar 40 installed is used for illustration, and the side plate 30 is first fixedly installed on one lug side of the battery cell 101 (i.e., corresponding to all the battery cells 101 in the battery assembly), and then all the lugs on the lug side are welded to the reserved welding positions on the side plate 30 with the busbar 40, so as to realize the series-parallel connection of multiple battery cells 101; it is easy to understand that if the busbar 40 does not need to be installed on one side of the battery assembly, it is only necessary to install the side plate 30, such as Figure 2 As shown; then, an insulating layer (not shown in the figure) is provided on both sides of the battery assembly along the second direction to insulate the busbar 40 and the side plate 30 (especially the above-mentioned welding position) from the outside.

[0077] Finally, if Figure 2 As shown, along the third direction, the insulating film 70, the heating film 60 and the insulating sheet 50 are sequentially assembled (for example, by bonding) from the inside to the outside on both sides of the battery module 100 to ensure the temperature regulation function and insulation of the battery module 100 as a whole. It should be noted that along the third direction, the height of the side plate 30 should be slightly greater than the height of the battery assembly. In this way, during the final assembly, the binding belt 80 does not need to be removed, and the insulating film 70, the heating film 60 and the insulating sheet 50 can be assembled to both sides of the battery assembly along the third direction through the gap between the binding belt 80 and the battery assembly.

[0078] The final effect of the assembled battery module 100 is as follows: Figure 1 shown.

[0079] With reference to the above assembly process, it can be seen that the battery module 100 provided in this embodiment is simple and convenient to assemble, and the provision of the restraining belt 80 can enhance the stability of the battery module 100 as a whole in the first direction and the third direction.

[0080] In addition, when such a battery module 100 is configured in an energy storage battery system of a high-altitude solar aircraft, if the high-altitude solar aircraft operates under excessive air pressure, the battery cells 101 in the battery module 100 are likely to over-expand during charging.

[0081] Therefore, in this embodiment, the setting of the restraint belt 80 can also play a role in slowing down the excessive expansion of the battery cell 101, thereby improving the overall discharge efficiency of the battery module 100 to a certain extent, and further improving the ability of the high-altitude solar aircraft to operate under excessive air pressure.

[0082] It is easy to understand that a plurality of restraint straps 80 can be provided, and the plurality of restraint straps 80 can be arranged at intervals along the second direction to further ensure the stability of the battery module 100 as a whole in the first direction and the third direction; at the same time, since the area covered by the plurality of restraint straps 80 is increased, that is, more positions of the battery cell 101 along the second direction will be affected by the restraining effect of the restraint straps 80, the phenomenon of excessive expansion of the battery cell 101 can be further alleviated, thereby more effectively improving the overall discharge efficiency of the battery module 100, and further more effectively improving the ability of the high-altitude solar aircraft to operate under extended air pressure.

[0083] An embodiment of the present invention further provides an energy storage battery system, which includes a plurality of any of the above-mentioned battery modules 100 .

[0084] In this embodiment, since the overall specific energy and grouping rate of any of the above-mentioned battery modules 100 are relatively high, the energy storage battery system including multiple of any of the above-mentioned battery modules 100 also has the advantage of being lightweight. Therefore, a high-altitude solar aircraft equipped with such an energy storage battery system can improve its wind-resistant flying capability at night. For the specific principles, please refer to the previous description of any of the above-mentioned battery modules 100, which will not be repeated here.

[0085] An embodiment of the present invention further provides a high-altitude solar aircraft, which includes a solar cell system and the above-mentioned energy storage battery system, wherein the solar cell system is used to supply power to the energy storage battery system.

[0086] In this embodiment, similarly, according to the above analysis, this high-altitude solar-powered aircraft can improve its wind-resistant flying capability at night.

[0087] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A battery module suitable for an energy storage battery system of a high-altitude solar aircraft, characterized in that: The battery module comprises: A battery assembly, comprising a plurality of battery units arranged along a first direction, wherein the battery unit comprises at least one battery cell, and both sides of the battery cell along a second direction are pole ear sides of the battery cell, and the second direction is perpendicular to the first direction; Two end plates, along the first direction, the two end plates are respectively located on both sides of the battery assembly, and each end plate is fixedly connected to the battery assembly; Two side plates, along the second direction, the two side plates are respectively located on both sides of the battery assembly, and the side plates are used to isolate all the pole ears on the pole ear side corresponding to the side plates from the outside of the battery assembly; A busbar connected to one of the side plates, the busbar being used to connect a plurality of the battery cells; and Two insulating sheets are respectively located on both sides of the battery assembly along a third direction, each of the insulating sheets is fixedly connected to the battery assembly, and the third direction is perpendicular to the first direction / the second direction in pairs.

2. The battery module according to claim 1, characterized in that: The battery module also includes a temperature control mechanism, which is used to adjust the temperature of the battery assembly.

3. The battery module according to claim 2, characterized in that: The temperature control mechanism comprises two heating films, and along the third direction, the two heating films are respectively located on both sides of the battery assembly, and the two heating films are arranged in one-to-one correspondence with the two insulating sheets; In a group of the heating film and the insulating sheet corresponding to each other, along the third direction, the insulating sheet is located on a side of the heating film away from the battery assembly.

4. The battery module according to claim 3, characterized in that: The battery unit includes two battery cells arranged along the first direction, and a temperature control plate is provided between the two battery cells. The temperature control plate is used to transfer the heat generated by the heating film to the two battery cells.

5. The battery module according to claim 4, characterized in that: The battery module further includes two insulating films, which are respectively located on both sides of the battery assembly along the third direction, and the two insulating films are arranged in one-to-one correspondence with the two heating films; In a group of the insulating film and the heating film corresponding to each other, the insulating film is attached to the battery assembly, and along the third direction, the heating film is located on a side of the insulating film away from the battery assembly.

6. The battery module according to claim 1, characterized in that: The battery cell further comprises a filler, and along the first direction, the filler is in contact with the battery cell adjacent to the filler itself, and the filler can be compressed and expanded along the first direction.

7. The battery module according to claim 1, characterized in that: The end plates and the side plates are both non-metal composite material plates.

8. The battery module according to any one of claims 1 to 7, characterized in that: The battery module also includes a restraining band for limiting the expansion of the battery cell. The restraining band is an annular structure, and the inner wall of the restraining band is in contact with the two end plates and the two insulating sheets.

9. An energy storage battery system, characterized in that: The invention comprises a plurality of battery modules according to any one of claims 1 to 8.

10. A high altitude solar powered aircraft, characterized in that: It comprises a solar cell system and the energy storage battery system as claimed in claim 9, wherein the solar cell system is used to supply power to the energy storage battery system.

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