Battery module, battery assembly and driving equipment

Abstract

The utility model discloses a battery module, a battery assembly and driving equipment, and relates to the technical field of transportation. The battery module comprises a cooling plate, a heat insulation layer and at least two battery cells arranged at intervals in the first direction, the heat insulation layer is arranged between every two adjacent battery cells in the first direction, the side wall surfaces of the battery cells in the second direction are connected with the cooling plate, and an included angle is formed between the first direction and the second direction; at least one of the side, back to the battery core, of the heat insulation layer and the side, back to the battery core, of the cooling plate is used for arranging a filling body, and the heat conductivity coefficient of the heat insulation layer is smaller than that of the filling body. When thermal runaway of the battery cells occurs, the temperature of the battery cells rises sharply, and the heat of the battery cells with thermal runaway tends to be transferred to the adjacent battery cells; the heat insulation layer can guide heat to flow to the cooling plate, and then the heat is discharged outwards through the cooling plate, so that the possibility that the heat is transferred to the nearby filling body and the nearby battery cells is reduced, and the risk of thermal runaway diffusion between the battery cells is reduced.

Description

Technical Field

[0001] The present application relates to the field of transportation technology, and in particular to a battery module, a battery assembly and a driving device. Background Art

[0002] With the development of electric aviation equipment technology, flying car-type driving equipment is emerging on the market. For flying car-type driving equipment, its battery module usually needs to use a battery cell with a higher energy density. In the related art, land-based electric vehicles usually use potting glue between battery cells as a heat insulation material between battery cells. The potting glue can be polyurethane or silicone material.

[0003] However, the thermal insulation effect of the above-mentioned potting glue is limited because the thermal insulation performance of the potting glue decays rapidly at high temperatures. At room temperature, the thermal conductivity of the potting glue is about 0.03W / mK (watts per meter degree); however, at high temperatures (about 500°C), the thermal conductivity of the potting glue increases to about 0.3W / mK, and its thermal insulation performance drops to 1 / 10. In addition, the surface temperature of some high-energy-density battery cells after thermal runaway usually reaches 600 to 800°C. At this time, the thermal insulation performance of the above-mentioned potting glue drops rapidly, and it can only block the spread of thermal runaway for a limited time, for example, it can block the spread of thermal runaway within about 5 minutes. As time goes on, there is still a risk of thermal runaway spreading between battery cells. Utility Model Content

[0004] The main purpose of this application is to propose a battery module to help reduce the risk of thermal runaway spreading between battery cells.

[0005] To achieve the above-mentioned objectives, the battery module proposed in the present application includes a cooling plate, an insulation layer and at least two battery cells arranged at intervals along a first direction, the insulation layer is arranged between two adjacent battery cells in the first direction, and the side wall surface of the battery cell in the second direction is connected to the cooling plate; the first direction and the second direction are respectively parallel to the cross-section of the battery cell, and an angle is formed between the first direction and the second direction; at least one of the side of the insulation layer facing away from the battery cell and the side of the cooling plate facing away from the battery cell is used to set a filling body, and the thermal conductivity of the insulation layer is less than the thermal conductivity of the filling body.

[0006] Optionally, along the circumferential direction of the battery core, the cooling plates are respectively provided on both sides of the thermal insulation layer; and / or, along the circumferential direction of the battery core, the cooling plates are respectively abutted on both sides of the thermal insulation layer.

[0007] Optionally, the battery cell is configured to be cylindrical or elliptical; the cooling plate includes at least two bending sections, the bending sections form a recessed space facing the battery cell, and the battery cell is partially accommodated in the recessed space; the bending sections are arranged at intervals along the first direction, and the battery cells are arranged one-to-one with the bending sections.

[0008] Optionally, along the circumferential direction of the battery core, the thermal insulation layer surrounds the battery core; the thermal insulation layer forms a surrounding gap in the second direction, and the battery core is connected to the cooling plate on one side facing the surrounding gap.

[0009] Optionally, the thermal insulation layer abuts against the side wall surface of the battery core, and the thermal insulation layer is respectively provided at both ends of the battery core in the first direction; the thermal insulation layer forms the surrounding notch at both ends of the second direction, and the cooling plate is respectively provided at both ends of the battery core in the second direction.

[0010] Optionally, between two adjacent battery cells in the first direction, the battery module is provided with two thermal insulation layers, and the two thermal insulation layers are connected to the two battery cells one by one; and / or, the central angle of each thermal insulation layer around the axis of the battery cell is greater than or equal to 100 degrees and less than or equal to 140 degrees; and / or, the central angle of each surrounding notch around the axis of the battery cell is greater than or equal to 40 degrees and less than or equal to 80 degrees.

[0011] Optionally, the thermal insulation layer abuts against a side wall surface of the battery core, and a central angle of the thermal insulation layer around an axis of the battery core is greater than or equal to 270 degrees and less than or equal to 330 degrees.

[0012] Optionally, in the first direction, at least a portion of the thermal insulation layer is spaced apart from the battery core.

[0013] Optionally, the thermal insulation layer includes a straight section extending along the second direction; and / or at least a portion of the thermal insulation layer is bonded to the battery core; and / or a filler is provided in the gap between the thermal insulation layer and the battery core, and the thermal conductivity of the thermal insulation layer is smaller than the thermal conductivity of the filler.

[0014] Optionally, a heat-conducting layer is further provided between the cooling plate and the battery core, the two sides of the heat-conducting layer respectively abut the cooling plate and the battery core, and the thermal conductivity of the heat-conducting layer is greater than the thermal conductivity of the filling body; and / or, at least one cooling channel is formed inside the cooling plate, the cooling channel is used to accommodate a coolant, and the coolant is used to flow along the cooling channel; and / or, the thickness direction of the cooling plate is parallel to the cross-section of the battery core, and the thickness of the cooling plate is greater than or equal to 0.2 mm and less than or equal to 2 mm; and / or, the height of the heat-insulating layer is less than the height of the battery core, and the height difference between the heat-insulating layer and the battery core is greater than or equal to 2 mm and less than or equal to 2 mm. Less than or equal to 15 mm; the bottom end of the thermal insulation layer is higher than the lower end of the battery cell to form a through gap, and a filling body is provided in the through gap; and / or, the energy density of the battery cell is greater than or equal to 250 watt-hours per kilogram; and / or, the thermal insulation layer includes aerogel felt; the thermal insulation layer also includes a coating film, and the coating film is coated on the outside of the aerogel felt; the surface of the thermal insulation layer is also provided with an adhesive film, one side of the adhesive film is bonded to the battery cell, and the other side of the adhesive film is bonded to the coating film; and / or, the battery module also includes a filling body, and the cooling plate, the thermal insulation layer and the battery cell are respectively configured to be at least partially filled in the filling body.

[0015] The present application also proposes a battery assembly, which includes a battery box and the above-mentioned battery module, and the battery module is arranged in the battery box.

[0016] The present application also proposes a traveling device, which includes a traveling mechanism and the above-mentioned battery module, wherein the battery module is used to provide power to the traveling mechanism, and the traveling device includes at least one of a flying car and a land car.

[0017] The technical solution of the present application is to configure the battery module to include a cooling plate, an insulation layer and at least two battery cells spaced apart along a first direction, a insulation layer is provided between two adjacent battery cells in the first direction, and the side wall surface of the battery cell in the second direction is connected to the cooling plate; the first direction and the second direction are respectively parallel to the cross-section of the battery cell, and an angle is formed between the first direction and the second direction; at least one of a side of the insulation layer facing away from the battery cell and a side of the cooling plate facing away from the battery cell is used to set a filling body, and the thermal conductivity of the insulation layer is less than the thermal conductivity of the filling body; when thermal runaway occurs in the battery cell, the temperature of the battery cell rises sharply, and the heat of the thermal runaway battery cell tends to be transferred to adjacent battery cells; the insulation layer can guide the heat to flow to the cooling plate, and then discharge the heat outward through the cooling plate, thereby reducing the possibility of heat transfer to nearby filling bodies and nearby battery cells, and reducing the risk of thermal runaway spreading between battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a battery module according to an embodiment of the present application when viewed from above.

[0020] Figure 2 It is a three-dimensional schematic diagram of an embodiment of a battery module of the present application.

[0021] Figure 3 This is a schematic diagram of the structure of the cooling plate in a top view in one embodiment of the battery module of the present application.

[0022] Figure 4 This is an exploded view of the thermal insulation layer in one embodiment of the battery module of the present application.

[0023] Figure 5 This is a schematic diagram of the structure of another embodiment of the battery module of the present application when viewed from above.

[0024] Figure 6 It is a three-dimensional schematic diagram of another embodiment of the battery module of the present application.

[0025] Figure 7 This is a schematic diagram of the structure of another embodiment of the battery module of the present application when viewed from above.

[0026] Figure 8 It is a three-dimensional schematic diagram of another embodiment of the battery module of the present application.

[0027] Fig. 9 for Figure 7 A partial enlarged view of point C in the middle.

[0028] Description of Figure Numbers:

[0029] Label name Label name 100 Cooling Plate 110 Bend section 111 Sunken Space 200 Insulation 201 Surrounding notch 202 Straight section 210 Aerogel Felt 220 Coating film 230 Adhesive film 300 Battery Cell 400 Filling 500 Thermally conductive layer

[0030] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0034] With the development of electric aviation equipment technology, flying car-type driving equipment is emerging on the market. For flying car-type driving equipment, its battery module usually needs to use a battery cell with a higher energy density. In the related art, land-based electric vehicles usually use potting glue between battery cells as a heat insulation material between battery cells. The potting glue can be polyurethane or silicone material.

[0035] However, the thermal insulation effect of the above-mentioned potting glue is limited because the thermal insulation performance of the potting glue decays rapidly at high temperatures. At room temperature, the thermal conductivity of the potting glue is about 0.03W / mK (watts per meter degree); however, at high temperatures (about 500°C), the thermal conductivity of the potting glue increases to about 0.3W / mK, and its thermal insulation performance drops to 1 / 10. In addition, the surface temperature of some high-energy-density battery cells after thermal runaway usually reaches 600 to 800°C. At this time, the thermal insulation performance of the above-mentioned potting glue drops rapidly, and it can only block the spread of thermal runaway for a limited time, for example, it can block the spread of thermal runaway within about 5 minutes. As time goes on, there is still a risk of thermal runaway spreading between battery cells.

[0036] Therefore, the present application proposes a battery module to help reduce the risk of thermal runaway spreading between battery cells.

[0037] Reference Figure 1 and Figure 2In one embodiment of the present application, the battery module includes a cooling plate 100, a heat insulating layer 200 and at least two battery cells 300 spaced apart along a first direction, a heat insulating layer 200 is provided between two adjacent battery cells 300 in the first direction, and a side wall surface of the battery cell 300 in the second direction is connected to the cooling plate 100; the first direction and the second direction are respectively parallel to the cross section of the battery cell 300, and an angle is formed between the first direction and the second direction; for example, referring to Figure 1 , the first direction can be set along the X direction, the second direction can be set along the Y direction, and the cross section of the battery cell 300 can be set to be parallel to the XY plane, that is, Figure 1 The first direction in the corresponding implementation manner is perpendicular to the second direction. Of course, the angle formed between the first direction and the second direction can also be set to be greater than 0 degrees and less than 90 degrees, for example, to be set to an angle of 80 degrees, 70 degrees, 60 degrees, 50 degrees or 40 degrees, and this embodiment is not limited to this.

[0038] In this embodiment, at least one of the side of the insulation layer 200 facing away from the battery cell 300 and the side of the cooling plate 100 facing away from the battery cell 300 is used to set the filler 400 , and the thermal conductivity of the insulation layer 200 is smaller than the thermal conductivity of the filler 400 .

[0039] In some embodiments, the battery module may include the above-mentioned filler 400, which may be configured as a potting glue, and the potting glue may be made of polyurethane or silicone material. At this time, the filler 400 can fix the insulation layer 200 and the cooling plate 100 in the lateral direction, thereby improving the stability of the heat transfer path of the battery cell 300. The insulation layer 200 may include an aerogel felt 210, so that the thermal conductivity of the insulation layer 200 is less than the thermal conductivity of the filler 400.

[0040] Further, refer to Figure 4 The thermal insulation layer 200 can be configured to include an aerogel felt 210 ; in addition, the thermal insulation layer 200 can also include a coating film 220 , which can be made of fiberglass cloth or PET material (PET, polyethylene terephthalate), and the coating film 220 is coated on the outside of the aerogel felt 210 .

[0041] Aerogel felt 210 may sometimes drop powder. In this embodiment, coating film 220 can prevent the falling powder from being output to the outside, improve the internal cleanliness of the battery module, and reduce the risk of falling powder and causing poor filling effect of filler 400. Furthermore, the surface of thermal insulation layer 200 is also provided with adhesive film 230, which can be made of adhesive backing; one side of adhesive film 230 is bonded to battery cell 300, and the other side of adhesive film 230 is bonded to coating film 220, so that thermal insulation layer 200 can be easily and quickly installed on battery cell 300.

[0042] Among them, the above-mentioned cooling plate 100 can be configured to form at least one cooling channel inside, and the cooling channel is used to contain coolant, and the coolant is used to flow along the cooling channel; for example, the cooling plate 100 can be configured as a harmonica tube made of aluminum alloy or other materials, so that the above-mentioned cooling channel is formed through the tube cavity of the harmonica tube.

[0043] In addition, the battery module may also include a battery tray, which includes a shell segment that surrounds a shell accommodating cavity, for example, the longitudinal cross-section of the shell segment may be U-shaped as a whole. At this time, the cooling plate 100, the insulation layer 200, and the battery cell 300 may be arranged in the shell accommodating cavity, and then the filling body 400 may be formed by filling or the like. Furthermore, in order to facilitate the installation of the battery module on the corresponding battery box, the upper end of the shell segment may also be provided with a connecting outer edge, which extends in a direction surrounding the shell segment; at this time, the connecting outer edge may be connected to the side wall of the battery box, for example, by overlapping, fastener connection or welding, etc. to be fixedly connected to the corresponding battery box.

[0044] In addition, the battery cell 300 may be configured as a cylindrical battery cell, a square shell battery cell, or a soft package battery cell, etc., which is not limited in this embodiment.

[0045] In this embodiment, when thermal runaway occurs in the battery cell 300, the temperature of the battery cell 300 rises sharply, and the heat of the battery cell 300 in thermal runaway tends to be transferred to the adjacent battery cell 300; the thermal insulation layer 200 can guide the heat to flow toward the cooling plate 100, and then discharge the heat outward through the cooling plate 100, thereby reducing the possibility of heat transfer to the nearby filling body 400 and the nearby battery cells 300, and reducing the risk of thermal runaway spreading between the battery cells 300.

[0046] When the energy density of the battery cell 300 is high, for example, when the energy density of the battery cell 300 is greater than or equal to 250 watt-hours per kilogram, the temperature of the battery cell 300 after thermal runaway may rise to about 600°C, and the shell of the battery cell 300 may rupture and cause the flame to spray laterally. In the above embodiment, when a battery cell 300 undergoes thermal runaway, the thermal insulation layer 200 or the cooling plate 100 with a relatively low thermal conductivity can reduce the possibility of the flame sprayed laterally igniting the filler 400 with a relatively high thermal conductivity, which is conducive to reducing the risk of adjacent battery cells 300 being burned by the flame. The battery module is conducive to having a higher safety performance while using a battery cell 300 with a high energy density.

[0047] In some embodiments, cooling plates 100 are provided on both sides of the thermal insulation layer 200 along the circumferential direction of the battery cells 300 , thereby further improving the heat dissipation efficiency and further reducing the risk of thermal runaway diffusion between the battery cells 300 .

[0048] In some embodiments, along the circumferential direction of the battery cell 300, the two sides of the thermal insulation layer 200 are respectively abutted against the cooling plates 100, thereby reducing the possibility of heat being transmitted outward from the gap between the thermal insulation layer 200 and the cooling plate 100, which is beneficial to further reduce the risk of thermal runaway diffusion between the battery cells 300.

[0049] In some embodiments, reference Figure 1 and Figure 2 , the battery cell 300 can be configured as a cylindrical or elliptical column shape, which can be understood as the battery cell 300 being configured as a cylindrical battery cell or an elliptical column battery cell. Figure 1 and Figure 3 The cooling plate 100 includes at least two bending sections 110, and the bending sections 110 form a recessed space 111 facing the battery cell 300, and the battery cell 300 is partially accommodated in the recessed space 111; the bending sections 110 are arranged at intervals along the first direction, for example, along the X direction in the figure, and the battery cells 300 and the bending sections 110 are arranged one by one.

[0050] In this embodiment, the bending section 110 can clamp and fix the battery cell 300 and the insulation layer 200 through the recessed space 111, for example, the insulation layer 200 extends into the recessed space 111 and abuts against the inner wall surface of the recessed space 111, further improving the stability of the heat transfer path of the battery cell 300.

[0051] In some embodiments, reference Figure 1 or Figure 5 , along the circumferential direction of the battery cell 300, the heat insulation layer 200 surrounds the battery cell 300; the heat insulation layer 200 forms a surrounding notch 201 in the second direction, for example, a surrounding notch 201 is formed in the Y direction in the figure, and the battery cell 300 is connected to the cooling plate 100 on the side facing the surrounding notch 201. It can be understood that the above-mentioned surrounding notch 201 is formed by surrounding the end of the heat insulation layer 200.

[0052] In this embodiment, the heat insulation layer 200 can guide the heat to be transferred from the surrounding notch 201 to the cooling plate 100 , which is beneficial to further reduce the risk of thermal runaway diffusion between the battery cells 300 .

[0053] In some embodiments, the heat insulating layer 200 abuts against the side wall of the battery cell 300. For example, the heat insulating layer 200 abuts against the side wall of the battery cell 300 due to an external force, wherein the external force can be set to be greater than or equal to zero; or, the heat insulating layer 200 can abut against the side wall of the battery cell 300 by bonding or the like. Figure 1 , the battery cell 300 is provided with a heat insulation layer 200 at both ends of the first direction, for example Figure 1 The two ends in the X direction of the heat insulation layer 200 are respectively provided. Figure 1 The left and right sides of the battery cell 300 are respectively provided with a heat insulation layer 200. The heat insulation layer 200 forms a surrounding gap 201 at both ends of the second direction, and the cooling plate 100 is respectively provided at both ends of the battery cell 300 in the second direction. Figure 1 The two ends of the Y direction in the figure are respectively provided with cooling plates 100, which can be understood as Figure 1 Cooling plates 100 are respectively provided on the upper and lower sides of the battery cell 300.

[0054] In this embodiment, surrounding gaps 201 are formed at both ends of the second direction and corresponding cooling plates 100 are provided, which further improves the efficiency of heat dissipation and further reduces the risk of thermal runaway diffusion between the battery cells 300.

[0055] In some embodiments, reference Figure 1 and Figure 2 , two battery cells 300 (eg Figure 1 Between two adjacent battery cells 300 in the X direction, the battery module is provided with two thermal insulation layers 200, and the two thermal insulation layers 200 are connected to the two battery cells 300 in a one-to-one correspondence, thereby further reducing the possibility of heat transfer to adjacent battery cells and further reducing the risk of thermal runaway diffusion between the battery cells 300.

[0056] In some embodiments, reference Figure 1 The central angle A of each insulation layer 200 around the axis of the battery cell 300 is greater than or equal to 100 degrees and less than or equal to 140 degrees. For example, the central angle A is set to be greater than or equal to 110 degrees and less than or equal to 130 degrees, for example, it is set to an angle value of 120, so as to improve the thermal insulation performance of the insulation layer 200 for the battery cell 300.

[0057] In some embodiments, reference Figure 1 The central angle B of each surrounding notch 201 around the axis of the battery cell 300 is greater than or equal to 40 degrees and less than or equal to 80 degrees. For example, the central angle B is set to be greater than or equal to 50 degrees and less than or equal to 70 degrees, for example, it is set to an angle value of 60 degrees, thereby further improving the efficiency of heat discharge from the surrounding notch 201 and the corresponding cooling plate 100, and further reducing the risk of thermal runaway diffusion between the battery cells 300.

[0058] In some embodiments, reference Figure 5 and Figure 6, the heat insulation layer 200 is in contact with the side wall of the battery cell 300, and the center angle A of the heat insulation layer 200 around the axis of the battery cell 300 is greater than or equal to 270 degrees and less than or equal to 330 degrees, for example, the center angle A is greater than or equal to 280 degrees and less than or equal to 310 degrees, for example, it is set to 300 degrees, etc.; it can be understood that the heat insulation layer 200 is relatively large and can surround most of the side wall of the battery cell 300, thereby reducing the use of the cooling plate 100, reducing the overall cost and manufacturing difficulty of the battery module. Correspondingly, the center angle B of the axis of the battery cell 300 around the notch 201 can be set to be greater than or equal to 40 degrees and less than or equal to 80 degrees, for example, the center angle B is set to be greater than or equal to 50 degrees and less than or equal to 70 degrees, for example, it is set to 60 degrees and other angle values.

[0059] In this embodiment, the central angle A of the heat insulation layer 200 around the axis of the battery cell 300 is greater than or equal to 270 degrees and less than or equal to 330 degrees, which is beneficial to improving the heat insulation performance of the heat insulation layer 200 for the battery cell 300.

[0060] In some embodiments, reference Figure 7 and Figure 8 In a first direction, for example, in the X direction in the figure, at least part of the heat insulating layer 200 is spaced apart from the battery cell 300. The space formed by the heat insulating layer 200 and the battery cell 300 can refer to Fig. 9 Medium size L.

[0061] Specifically, in some embodiments, referring to Fig. 9 The heat insulating layer 200 can be configured to include a straight section 202 extending along the second direction, for example, the straight section 202 extending along the Y direction in the figure, which can be understood as the heat insulating layer 200 being entirely straight or partially straight, so that the heat insulating layer 200 can be made of a relatively hard material, reducing the material restrictions of the heat insulating layer 200, which is beneficial to reducing the overall cost of the battery module. In addition, the heat insulating layer 200 includes the straight section 202, which is beneficial to reducing the workload of attaching the heat insulating layer 200 to the battery cell 300 and improving manufacturing efficiency.

[0062] Furthermore, for the thermal insulation layer 200 including the straight section 202, at least a portion of the thermal insulation layer 200 can be bonded to the battery cell 300, thereby improving the connection stability of the thermal insulation layer 200. In addition, for the thermal insulation layer 200 including the straight section 202, both ends of the thermal insulation layer 200 can be connected to the corresponding cooling plate 100 by abutting, clamping or bonding.

[0063] In some embodiments, the above-mentioned filler 400 is provided in the gap between the thermal insulation layer 200 and the battery cell 300 , thereby improving the installation stability of the thermal insulation layer 200 and further improving the stability of the heat transfer path of the battery cell 300 ; wherein the thermal conductivity of the thermal insulation layer 200 is less than the thermal conductivity of the filler 400 .

[0064] In some embodiments, reference Figure 1 or Figure 5 , a heat-conducting layer 500 is also provided between the cooling plate 100 and the battery cell 300, and the two sides of the heat-conducting layer 500 abut against the cooling plate 100 and the battery cell 300 respectively, and the thermal conductivity of the heat-conducting layer 500 is greater than the thermal conductivity of the filling body 400, thereby improving the transfer efficiency of heat from the battery cell 300 to the cooling plate 100. Among them, the heat-conducting layer 500 can be made of a heat-conducting structural adhesive. It can be understood that the gap between the cooling plate 100 and the battery cell 300 can be set to be relatively small, so that the above-mentioned heat-conducting layer 500 can also be omitted; if the above-mentioned heat-conducting layer 500 is provided, the heat-conducting structural adhesive can spread in the gap between the cooling plate 100 and the battery cell 300 through the siphon effect, thereby better filling the gap between the cooling plate 100 and the battery cell 300.

[0065] In some embodiments, the thickness direction of the cooling plate 100 is parallel to the cross-section of the battery cell 300, for example, parallel to the XY plane in the figure, and the thickness of the cooling plate 100 is greater than or equal to 0.2 mm and less than or equal to 2 mm, thereby improving the efficiency of heat dissipation from the cooling plate 100 while reducing the space occupied by the cooling plate 100 and improving the structural compactness of the battery module.

[0066] In some embodiments, the height of the thermal insulation layer 200 is less than the height of the battery cell 300, and the height difference between the thermal insulation layer 200 and the battery cell 300 is greater than or equal to 2 mm and less than or equal to 15 mm, for example, the height difference is set to be greater than or equal to 5 mm and less than or equal to 10 mm; the bottom end of the thermal insulation layer 200 is higher than the lower end of the battery cell 300 to form a through gap, and a filler 400 is provided in the through gap. In this embodiment, the filler 400 can circulate relatively quickly during the liquid filling stage, which is conducive to improving the overall manufacturing efficiency of the battery module.

[0067] In some embodiments, while the battery module includes the above-mentioned filling body 400, the cooling plate 100, the insulation layer 200 and the battery cell 300 are respectively configured to be at least partially filled in the filling body 400, thereby improving the overall structural stability and improving the stability of the heat transfer path of the battery cell 300.

[0068] The present application also proposes a battery assembly, which includes a battery box and the above-mentioned battery module, wherein the battery module is arranged in the battery box. In addition, the battery assembly may also include a busbar connecting each battery cell.

[0069] The present application also proposes a driving device, which includes a travel mechanism and the above-mentioned battery module, the battery module is used to provide power to the travel mechanism, and the driving device includes at least one of a flying car and a land car. For the flying car, the travel mechanism includes a rotor and a corresponding motor and other structures; for the land car, the travel mechanism includes a wheel assembly, a corresponding transmission mechanism and a corresponding motor and other structures. When the driving device includes a flying car and a land car, the flying car can be configured to be detachably mounted on the land car.

[0070] It is understandable that, since the battery assembly and the driving equipment adopt all the technical solutions of all the above embodiments, they at least have all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0071] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery module, characterized in that: The battery module includes a cooling plate, a thermal insulation layer and at least two battery cells spaced apart along a first direction; the thermal insulation layer is arranged between two adjacent battery cells in the first direction, and the side wall surface of the battery cell in the second direction is connected to the cooling plate; the first direction and the second direction are respectively parallel to the cross-section of the battery cell, and an angle is formed between the first direction and the second direction; at least one of a side of the thermal insulation layer facing away from the battery cell and a side of the cooling plate facing away from the battery cell is used to set a filling body, and the thermal conductivity of the thermal insulation layer is less than the thermal conductivity of the filling body.

2. The battery module according to claim 1, characterized in that: Along the circumferential direction of the battery core, the cooling plates are respectively provided on both sides of the heat insulation layer; and / or, Along the circumferential direction of the battery core, two sides of the heat insulation layer are respectively in contact with the cooling plates.

3. The battery module according to claim 1, characterized in that: The battery core is configured in a cylindrical or elliptical shape; The cooling plate includes at least two bending sections, the bending sections form a recessed space facing the battery cell, and the battery cell is partially accommodated in the recessed space; the bending sections are arranged at intervals along the first direction, and the battery cell and the bending sections are arranged in a one-to-one correspondence.

4. The battery module according to any one of claims 1 to 3, characterized in that: The heat insulation layer surrounds the battery core along the circumferential direction of the battery core; the heat insulation layer forms a surrounding gap in the second direction, and the battery core is connected to the cooling plate on one side facing the surrounding gap.

5. The battery module according to claim 4, characterized in that: The thermal insulation layer abuts against the side wall surface of the battery core, and the thermal insulation layer is respectively provided at both ends of the battery core in the first direction; the thermal insulation layer forms the surrounding notch at both ends of the second direction, and the cooling plate is respectively provided at both ends of the battery core in the second direction.

6. The battery module according to claim 5, characterized in that: Between two adjacent battery cells in the first direction, the battery module is provided with two thermal insulation layers, and the two thermal insulation layers are connected to the two battery cells in a one-to-one correspondence; and / or, The central angle of each of the heat insulation layers around the axis of the battery core is greater than or equal to 100 degrees and less than or equal to 140 degrees; and / or, The central angle of each surrounding notch around the axis of the battery core is greater than or equal to 40 degrees and less than or equal to 80 degrees.

7. The battery module according to claim 4, characterized in that: The heat insulation layer abuts against the side wall surface of the battery core, and a central angle of the heat insulation layer around the axis of the battery core is greater than or equal to 270 degrees and less than or equal to 330 degrees.

8. The battery module according to any one of claims 1 to 3, characterized in that: In the first direction, at least a portion of the thermal insulation layer is spaced apart from the battery core.

9. The battery module according to claim 8, characterized in that: The heat insulation layer comprises a straight section extending along the second direction; and / or, At least part of the thermal insulation layer is bonded to the battery core; and / or, A filler is provided in the space between the heat insulating layer and the battery core, and the thermal conductivity of the heat insulating layer is smaller than the thermal conductivity of the filler.

10. The battery module according to any one of claims 1 to 3, characterized in that: A heat-conducting layer is further provided between the cooling plate and the battery core, two sides of the heat-conducting layer abut against the cooling plate and the battery core respectively, and the thermal conductivity of the heat-conducting layer is greater than the thermal conductivity of the filling body; and / or, At least one cooling channel is formed inside the cooling plate, and the cooling channel is used to contain a cooling liquid, and the cooling liquid is used to flow along the cooling channel; and / or, The thickness direction of the cooling plate is parallel to the cross section of the battery core, and the thickness of the cooling plate is greater than or equal to 0.2 mm and less than or equal to 2 mm; and / or, The height of the thermal insulation layer is smaller than the height of the battery core, and the height difference between the thermal insulation layer and the battery core is greater than or equal to 2 mm and less than or equal to 15 mm; the bottom end of the thermal insulation layer is higher than the lower end of the battery core to form a through gap, and a filling body is provided in the through gap; and / or, The energy density of the battery cell is greater than or equal to 250 watt-hours per kilogram; and / or, The thermal insulation layer includes an aerogel felt; the thermal insulation layer also includes a coating film, and the coating film is coated on the outside of the aerogel felt; an adhesive film is also provided on the surface of the thermal insulation layer, one side of the adhesive film is bonded to the battery core, and the other side of the adhesive film is bonded to the coating film; and / or, The battery module further includes a filling body, and the cooling plate, the heat insulating layer and the battery core are respectively configured to be at least partially filled in the filling body.

11. A battery assembly, comprising a battery box and a battery module as claimed in any one of claims 1 to 10, wherein the battery module is arranged in the battery box.

12. A traveling device, characterized in that: The traveling device comprises a traveling mechanism and a battery module as claimed in claim 11, wherein the battery module is used to provide power to the traveling mechanism, and the traveling device comprises at least one of a flying car and a land car.

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