Battery device and electric device

Abstract

The battery device comprises a box body, a battery single body assembly and a heat exchange assembly, the battery single body assembly is arranged in the box body and comprises a plurality of battery single bodies, and the heat exchange assembly is used for exchanging heat with the battery single bodies and comprises a plurality of heat exchange units and a plurality of current collecting pieces; each heat exchange unit forms a heat exchange pipe and is provided with a heat exchange flow channel, at least part of each heat exchange unit is bent and extends, each heat exchange unit is provided with two connecting ends in the extending direction, each flow collecting piece is provided with two flow collecting openings, the two connecting ends of each heat exchange unit are connected with the flow collecting openings of the different flow collecting pieces respectively, and the flow collecting openings of the flow collecting pieces are connected with the heat exchange pipes. The multiple heat exchange units are sequentially connected through the multiple flow collecting pieces, and the multiple flow collecting pieces are arranged in the horizontal direction. According to the battery device provided by the invention, by optimizing the structure of the heat exchange assembly, the effective utilization of the space in the battery device can be favorably realized, the overall height size of the battery device can be favorably reduced, and the energy density of the battery device can be favorably improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In related technologies, to ensure that battery devices operate within a suitable temperature range, a heat exchange assembly is typically installed to exchange heat with the battery cells of the battery device to regulate the temperature of the battery cells. The introduction of a heat exchange assembly increases the size of the entire battery device. Therefore, after incorporating a heat exchange assembly into a battery device to exchange heat between the battery cells, how to effectively utilize the space within the battery device to reduce its size has become a pressing technical challenge. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device. The battery device can optimize the structure of the heat exchange component to effectively utilize the space inside the battery device, reduce the overall height of the battery device, and improve the energy density of the battery device.

[0004] In the first aspect, the present application provides a battery device, which includes: a box body; a battery cell assembly, wherein the battery cell assembly is arranged in the box body, and the battery cell assembly includes a plurality of battery cells; a heat exchange assembly, wherein the heat exchange assembly is used to exchange heat with the battery cell assembly, and the heat exchange assembly includes a plurality of heat exchange units and a plurality of current collecting parts, each of the heat exchange units is formed as a heat exchange tube and has a heat exchange flow channel, at least part of the heat exchange unit is bent and extended, each of the heat exchange units has two connecting ends in the extension direction, each of the current collecting parts has two collecting ports, the two connecting ends of each heat exchange unit are respectively connected to the collecting ports of different current collecting parts, a plurality of the current collecting parts connect the plurality of heat exchange units in sequence, and the plurality of the current collecting parts are arranged in a horizontal direction.

[0005] In the above technical solution, the heat exchange component in the battery device is configured to include multiple heat exchange units and multiple current collecting pieces, and the multiple heat exchange units are connected in sequence through multiple current collecting pieces. The heat exchange medium flowing in the multiple heat exchange units can be introduced and led out in an orderly manner through the multiple current collecting pieces. By optimizing the structure of the heat exchange component, the current collecting pieces are configured to be arranged in a horizontal direction, which can fully utilize the horizontal space in the battery device. This can reduce the space in the height direction occupied by the current collecting pieces, which can be beneficial to achieving effective utilization of the space in the battery device, reducing the overall height size of the battery device, and improving the energy density of the battery device.

[0006] In some embodiments, the height difference between any two current collecting members in the vertical direction is less than or equal to 2 mm.

[0007] In the above technical solution, by designing the positional relationship of multiple current collecting parts in the height direction, the height difference between the center positions of any two current collecting parts in the height direction is less than or equal to 2 mm. In this way, multiple current collecting parts arranged in the horizontal direction can be arranged at approximately the same height, thereby better reducing the space occupied by multiple current collecting parts in the height direction, which is more conducive to reducing the overall height size of the battery device.

[0008] In some embodiments, the difference in thickness between any two current collecting members in the vertical direction is less than or equal to 2 mm.

[0009] In the above technical solution, by designing the dimensional relationship of multiple current collecting parts in the height direction, the difference in thickness between any two current collecting parts in the height direction is less than or equal to 2 mm. The thickness of multiple current collecting parts in the height direction can be made smaller or roughly the same, thereby better reducing the space occupied by multiple current collecting parts in the height direction, which is more conducive to reducing the overall height size of the battery device.

[0010] In some embodiments, the thickness of a single current collecting member in the up-down direction is less than or equal to 14 mm.

[0011] In the above technical solution, by designing the thickness dimension of a single current collecting component in the height direction, the thickness dimension of a single current collecting component in the height direction is made less than or equal to 14 mm, so that a single current collecting component occupies a smaller space in the height direction, and at the same time, multiple current collecting components are arranged in the horizontal direction. While making full use of the horizontal space in the battery device, the space occupied by multiple current collecting components in the height direction can be effectively reduced. For example, the space dimension occupied by multiple current collecting components in the height direction can be made about 14 mm, which is more conducive to reducing the overall height dimension of the battery device.

[0012] In some embodiments, the thickness of a single current collecting member in the vertical direction ranges from 8 mm to 13 mm.

[0013] In the above technical solution, on the basis of limiting the thickness dimension of a single current collecting part in the height direction to be less than or equal to 14 mm, the thickness dimension range of a single current collecting part in the height direction is further set to 8 mm to 13 mm. While making the thickness dimension of a single current collecting part in the height direction smaller to reduce the space occupied by multiple current collecting parts in the height direction, the wall thickness of a single current collecting part, the size of the internal cavity, etc. can be taken into account to meet the design requirements. For example, it can avoid the situation where the structural strength of the current collecting part is low and the size of the internal cavity is small due to the small thickness dimension of a single current collecting part in the height direction, which fails to meet the design requirements.

[0014] In some embodiments, the ratio of the thickness of a single current collecting member in the up-down direction to the thickness of a single heat exchange unit in the up-down direction is less than 1.8.

[0015] In the above technical solution, by designing the relationship between the thickness dimension of a single current collecting member in the height direction and the thickness dimension of a single heat exchange unit in the height direction, the ratio of the thickness dimension of a single current collecting member in the height direction to the thickness dimension of a single heat exchange unit in the height direction is less than 1.8, so that the thickness dimension of a single current collecting member in the height direction can be made smaller, so that the space occupied by a single current collecting member in the height direction is smaller, and at the same time, multiple current collecting members are arranged in the horizontal direction. While making full use of the horizontal space in the battery device, the space occupied by multiple current collecting members in the height direction can be effectively reduced, which is more conducive to reducing the overall height dimension of the battery device.

[0016] In some embodiments, the ratio of the thickness of a single current collecting member in the up-down direction to the thickness of a single heat exchange unit in the up-down direction is in the range of 1.2 to 1.7.

[0017] In the above technical solution, on the basis of limiting the ratio of the thickness dimension of a single current collecting part in the height direction to the thickness dimension of a single heat exchange unit in the height direction to be less than 1.8, the ratio of the thickness dimension of a single current collecting part in the height direction to the thickness dimension of a single heat exchange unit in the height direction is further limited to a range of 1.2 to 1.7. While making the thickness dimension of a single current collecting part in the height direction smaller to reduce the space occupied by multiple current collecting parts in the height direction, the wall thickness of a single current collecting part, the size of the internal cavity, etc. can be taken into account to meet the design requirements. For example, it can avoid the situation where the structural strength of the current collecting part is low and the internal cavity size is small due to the small thickness dimension of a single current collecting part in the height direction, which cannot meet the design requirements.

[0018] In some embodiments, the two collecting ports of a single current collecting member are located on opposite sides of the current collecting member.

[0019] In the above technical solution, by designing the positions of the two collecting ports of a single collecting member, the two collecting ports of a single collecting member are located on opposite sides of the collecting member. When two heat exchange units among multiple heat exchange units are respectively connected to the two collecting ports of a single collecting member, the two heat exchange units can be respectively connected to the collecting ports of the collecting member from opposite sides of the collecting member, which can reduce the increased difficulty of the connection process caused by interference when the two heat exchange units are connected to the same collecting member, thereby reducing the difficulty of the connection operation of the two heat exchange units to the same collecting member, making the connection operation of the two heat exchange units to the same collecting member more convenient.

[0020] In some embodiments, the connection end is inserted into the manifold.

[0021] In the above technical solution, by inserting the connecting end of the heat exchange unit into the collecting port, the connection between the heat exchange unit and the collecting member is facilitated, and the connection area between the heat exchange unit and the collecting member can be increased, making the connection between the two more stable.

[0022] In some embodiments, the connection end is connected to the current collecting member by welding.

[0023] In the above technical solution, the connection between the heat exchange unit and the current collecting member is made reliable by welding the connection end of the heat exchange unit to the current collecting member; in addition, since the thickness of the heat exchange unit and the current collecting member are relatively small, the heat exchange unit and the current collecting member are welded together, and the welding connection method can make the connection operation between the two more convenient, and compared with the fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set a connection hole for the fastener connection.

[0024] In some embodiments, at least some of the current collecting members are spaced apart.

[0025] In the above technical solution, by setting at least some of the current collecting parts apart, the mutual influence between the multiple current collecting parts can be reduced. While arranging the multiple current collecting parts in the horizontal direction, the horizontal space in the battery device is fully utilized, so that the current collecting parts can more flexibly utilize the horizontal space in the battery device.

[0026] In some embodiments, at least part of the current collecting members are arranged along a first direction, which is a length direction of the box body.

[0027] In the above technical solution, by arranging at least part of the current collecting members along the length direction of the box body of the battery device, the space in the length direction of the box body can be fully utilized, further improving the effective full utilization of the space in the box body by multiple current collecting members, which is more conducive to improving the energy density of the battery device.

[0028] In some embodiments, along the first direction, positions of at least two current collecting members in a second direction are at least partially staggered, and the second direction is the width direction of the box body.

[0029] In the above technical solution, the positions of at least two current collecting parts in the width direction of the box are at least partially staggered along the length direction of the box, which can make full use of the space in the width direction of the box, further improve the effective full use of the space in the box by multiple current collecting parts, is more conducive to improving the energy density of the battery device, and also makes the layout of multiple current collecting parts more flexible; and, by making the positions of at least two current collecting parts in the width direction of the box at least partially staggered, it is convenient to connect multiple current collecting parts with multiple external pipes respectively, and reduce the interference and difficult layout problems of external pipes connected to different current collecting parts. For example, since the positions of at least two current collecting parts in the width direction of the box are at least partially staggered, at least part of the multiple external pipes connected to the multiple current collecting parts can also be arranged roughly along the width direction of the box, which better utilizes the width direction space of the box and reduces the occupation of the height space in the battery device by the multiple external pipes connected to the multiple current collecting parts, which is conducive to reducing the overall height size of the battery device.

[0030] In some embodiments, at least part of the current collecting parts has a liquid inlet cavity and a liquid inlet connected to the liquid inlet cavity, and at least part of the current collecting parts has a liquid outlet cavity and a liquid outlet connected to the liquid outlet cavity; wherein the liquid inlets or the liquid outlets of two adjacent current collecting parts in the first direction are staggered in the second direction, and the second direction is the width direction of the box body.

[0031] In the above technical solution, by staggering the positions of the liquid inlets or liquid outlets of two adjacent current collecting parts in the second direction, it is convenient to connect the liquid inlets or liquid outlets of multiple current collecting parts with multiple external pipes respectively, and reduce the interference and difficult layout problems of external pipes connected to different current collecting parts. For example, since the positions of at least two current collecting parts in the width direction of the box are at least partially staggered, at least part of the multiple external pipes connected to the multiple current collecting parts can also be arranged roughly along the width direction of the box, so as to better utilize the width direction space of the box, and also reduce the occupation of the height space in the battery device by the multiple external pipes connected to the multiple current collecting parts, which is conducive to reducing the overall height size of the battery device.

[0032] In some embodiments, the two collecting ports of a single collecting member are located on opposite sides of the collecting member along a second direction, where the second direction is the width direction of the box body.

[0033] In the technical solution, the two collecting ports of the single collecting member are located at opposite sides of the collecting member along the width direction of the box body. When two heat exchange units in the plurality of heat exchange units are connected to the two collecting ports of the single collecting member respectively, the two heat exchange units are connected to the collecting ports of the collecting member from opposite sides of the collecting member respectively, the connection difficulty of the two heat exchange units and the single collecting member is reduced, the connection operation of the two heat exchange units and the single collecting member is facilitated, and the overall structure of the battery device is more compact.

[0034] In some embodiments, the plurality of collecting members are located at the same end of the heat exchange assembly along a first direction, and the first direction is a length direction of the box body.

[0035] In the technical solution, the plurality of collecting members are located at the same end of the heat exchange assembly along the length direction of the box body, and the plurality of collecting members are connected to the plurality of external pipelines respectively. Therefore, the plurality of connection positions of the heat exchange assembly and the external pipelines are arranged at the same end of the heat exchange assembly, and the heat exchange assembly and the external pipelines are connected conveniently. For example, when the battery device is used in a vehicle and the first direction is a longitudinal direction of the vehicle, the heat exchange assembly of the battery device and the external pipelines on the vehicle body are connected conveniently.

[0036] In some embodiments, the plurality of heat exchange units are connected to each other in a ring structure through the plurality of collecting members.

[0037] In the technical solution, the plurality of heat exchange units are connected to each other in a ring structure through the plurality of collecting members, the connection operation of the plurality of heat exchange units and the plurality of collecting members is simple, and the structure formed by the connection is simple.

[0038] In some embodiments, at least part of the collecting members have a liquid inlet cavity and a liquid inlet port communicating with the liquid inlet cavity, at least part of the collecting members have a liquid outlet cavity and a liquid outlet port communicating with the liquid outlet cavity, one of the two connection ends of each heat exchange unit is connected to the liquid inlet cavity through the collecting port, and the other of the two connection ends of each heat exchange unit is connected to the liquid outlet cavity through the collecting port.

[0039] In the above technical solution, by connecting the two connecting ends of each heat exchange unit to different current collectors, and by connecting the two connecting ends of each heat exchange unit to the liquid inlet and liquid outlet cavities of different current collectors, the heat exchange medium flowing into the liquid inlet of one of the current collectors can flow into the heat exchange unit, and after flowing through the heat exchange unit, the heat exchange medium flows into the liquid outlet of another current collector, thereby realizing the flow circulation of the heat exchange medium in the heat exchange unit. In this way, multiple heat exchange units can be arranged in parallel, so that the temperature of the heat exchange medium flowing in the multiple heat exchange units is close, so that the temperature regulation of the battery cell assembly by the multiple heat exchange units is more uniform. In addition, by forming the liquid inlet and liquid outlet cavities on different current collectors, the mutual influence between the heat exchange medium in the liquid inlet and the heat exchange medium in the liquid outlet can be reduced. For example, the heat exchange between the heat exchange medium in the liquid inlet and the heat exchange medium in the liquid outlet can be reduced or avoided, thereby reducing or avoiding the heat exchange between the heat exchange medium in the liquid inlet and the heat exchange medium in the liquid outlet, which affects the temperature regulation efficiency of the heat exchange medium for the battery cell.

[0040] In some embodiments, there are two heat exchange units and two collecting pieces, one of which has a liquid inlet cavity and a liquid inlet connected to the liquid inlet cavity, and the other has a liquid outlet cavity and a liquid outlet connected to the liquid outlet cavity.

[0041] In the above technical solution, by setting up two heat exchange units and two current collecting pieces, the structure of the heat exchange assembly can be made simpler, and by connecting the two connection ends of each heat exchange unit to the two current collecting pieces respectively, the two heat exchange units can be set in parallel, so that the temperatures of the heat exchange media flowing in the two heat exchange units are close, so that the temperature regulation of the battery cell assembly by the two heat exchange units can be more uniform.

[0042] In some embodiments, the heat exchange assembly includes a connecting bracket, and the connecting bracket is connected between at least two of the heat exchange units.

[0043] In the above technical solution, by setting a connecting bracket, at least two heat exchange units are connected with a connecting bracket, which can provide more connection positions between multiple heat exchange units, thereby improving the stability of the connection between multiple heat exchange units, and also making the structural strength or rigidity of the entire heat exchange component higher, thereby improving the structural stability of the entire heat exchange component. Since the structural strength or rigidity of the entire heat exchange component is higher, it is also convenient to install the heat exchange component into the box of the battery device.

[0044] In some embodiments, the connecting bracket is connected to the heat exchange unit by welding.

[0045] In the above technical solution, the thickness of the heat exchange unit and the size of the connecting bracket are both small. By welding the connecting bracket to the heat exchange unit, the connection between the connecting bracket and the heat exchange unit can be made more convenient and stable. Compared with the fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set a connecting hole for the fastener connection.

[0046] In some embodiments, at least a portion of the connecting bracket is located in a gap between two corresponding heat exchange units.

[0047] In the above technical solution, by making at least a portion of the connecting bracket located in the gap between the corresponding two heat exchange units, the gap between the heat exchange units can be fully utilized and the additional space occupied by the connecting bracket can be reduced. For example, the space occupied in the height direction of the battery device can be reduced, which is conducive to reducing the overall height size of the battery device.

[0048] In some embodiments, a dimension of the connecting bracket in the up-down direction is less than or equal to a thickness dimension of the heat exchange unit in the up-down direction.

[0049] In the above technical solution, on the basis of locating at least a portion of the connecting bracket in the gap between the corresponding two heat exchange units, the height dimension of the connecting bracket is made less than or equal to the thickness dimension of the heat exchange unit in the height direction. This allows the entire connecting bracket to be located in the gap between the heat exchange unit brackets, making it possible to more fully utilize the gap between the heat exchange units and being more conducive to reducing the additional space occupied by the connecting bracket. For example, it can reduce the space occupied in the height direction of the battery device, thereby helping to reduce the overall height dimension of the battery device.

[0050] In some embodiments, in the up and down directions, the surface of the heat exchange unit facing the battery cell assembly is the first surface, and the surface of the connecting bracket facing the battery cell assembly is the second surface, and the second surface is flush with the first surface or the second surface is located on the side of the first surface away from the battery cell assembly.

[0051] In the above technical solution, by ensuring that the surface of the connecting bracket facing the battery cell assembly does not protrude from the surface of the heat exchange unit facing the battery cell assembly, the surface of the heat exchange unit facing the battery cell assembly can be fully contacted with the battery cell assembly, thereby reducing the thermal resistance between the heat exchange unit and the battery cell assembly, improving the temperature regulation effect of the heat exchange unit on the battery cell assembly, and avoiding the large gap between the heat exchange unit and the battery cell assembly due to the surface of the connecting bracket facing the battery cell assembly protruding from the surface of the heat exchange unit facing the battery cell assembly, thereby avoiding the inability to achieve sufficient contact and heat exchange.

[0052] In some embodiments, the connecting bracket includes a bracket plate and two side flanges, and the two side flanges are connected to opposite sides of the bracket plate and are respectively connected to two adjacent heat exchange units.

[0053] In the above technical solution, by setting the connecting bracket to include a bracket plate and two sides connected to the opposite sides of the bracket plate, it is convenient to connect the connecting bracket to the heat exchange unit through the side flange, and also makes the structure of the connecting bracket simpler and convenient to process and manufacture.

[0054] In some embodiments, the heat exchange unit includes a first heat exchange part and a second heat exchange part. The first heat exchange parts of multiple heat exchange units jointly enclose a frame area, and the second heat exchange parts of multiple heat exchange units are all located in the frame area and bend and extend.

[0055] In the above technical solution, by setting the heat exchange unit to include a first heat exchange part and a second heat exchange part, and making the second heat exchange parts of multiple heat exchange units located in the frame area surrounded by the first heat exchange part, and at the same time making the second heat exchange parts bend and extend, the arrangement of multiple heat exchange units can be made compact, and the arrangement density of the heat exchange component per unit area can be increased, thereby improving the heat exchange capacity of the heat exchange component per unit area and improving the heat exchange efficiency of the heat exchange component for the battery cell component.

[0056] In some embodiments, the frame area is a rectangular frame area, the size of the rectangular frame area in the first direction is larger than the size of the rectangular frame area in the second direction, the first direction is the length direction of the box, and the second direction is the width direction of the box.

[0057] In the above technical solution, by making the frame area enclosed by the first heat exchange parts of the multiple heat exchange units a rectangular frame area, the frame area enclosed by the first heat exchange parts of the multiple heat exchange units can be similar to the shape of the box, so that the overall contour shape of the heat exchange component can be similar to the shape of the box, so that the heat exchange component makes full use of the space in the box, so that the heat exchange component has a larger heat exchange area and improves the heat exchange capacity of the heat exchange component; in addition, by making the overall contour shape of the heat exchange component similar to the shape of the box, the heat exchange between the heat exchange component and the battery cell assembly in the box can also be made more uniform.

[0058] In some embodiments, the second heat exchange portion includes a bending portion, the bending portion includes a plurality of first heat exchange segments and a second heat exchange segment, the plurality of first heat exchange segments are arranged at intervals along the first direction and each first heat exchange segment extends along the second direction, and the second heat exchange segment is connected between the same ends of two adjacent first heat exchange segments along the second direction.

[0059] In the above technical solution, by setting the bending extension mode of the bent and extended second heat exchange part to include multiple first heat exchange segments arranged along the first direction and second heat exchange segments connected between adjacent first heat exchange segments, the extension length of the second heat exchange part per unit area can be made longer, thereby making the heat exchange area per unit area of ​​the second heat exchange part larger and the heat exchange capacity stronger, thereby improving the heat exchange efficiency of the heat exchange unit for the battery cell assembly.

[0060] In some embodiments, the second heat exchange section extends in an arc shape.

[0061] In the above technical solution, by making the second heat exchange section connected between adjacent first heat exchange sections extend in an arc shape, the connection between adjacent first heat exchange sections can be made smoother, and the heat exchange medium flowing in the second heat exchange section can also be made smoother, reducing the flow resistance of the heat exchange medium between the two adjacent first heat exchange sections, which is beneficial to improving the heat exchange effect of the heat exchange unit.

[0062] In some embodiments, a distance between two adjacent first heat exchange sections in the first direction is greater than a width of the first heat exchange section.

[0063] In the above technical solution, by making the distance between two adjacent first heat exchange sections greater than the width of the first heat exchange section, the difficulty of the bending process of the second heat exchange section can be reduced during the process of bending the second heat exchange section to form multiple first heat exchange sections and second heat exchange sections.

[0064] In some embodiments, a ratio of an extension length of the first heat exchange section to an extension length of the second heat exchange section is 0.7-2.

[0065] In the above technical solution, by making the ratio of the extension length of the first heat exchange section to the extension length of the second heat exchange section 0.7 to 2, the extension length of the second heat exchange section connected between two adjacent first heat exchange sections can be longer. In the process of bending the second heat exchange section to form multiple first heat exchange sections and second heat exchange sections, the difficulty of the bending process of the second heat exchange section can be reduced.

[0066] In some embodiments, there are two heat exchange units and two current collecting pieces. The first heat exchange parts of the two heat exchange units are connected through one of the current collecting pieces, the second heat exchange parts of the two heat exchange units are connected through another current collecting piece, and the bending parts of the two heat exchange units are arranged along the first direction.

[0067] In the above technical solution, by providing two heat exchange units and two current collecting members, the structure of the heat exchange assembly can be made simpler; and the bending parts of the two heat exchange units are arranged along the length direction of the box body, which can make full use of the length direction space of the box body. While making the arrangement of the two heat exchange units more compact, it is also beneficial to improve the energy density of the battery device.

[0068] In some embodiments, the two heat exchange units are respectively a first heat exchange unit and a second heat exchange unit, the second heat exchange part of the second heat exchange unit also includes a third heat exchange section, at least part of the third heat exchange section extends along the first direction, one end of the third heat exchange section is connected to the bending part of the second heat exchange unit and the other end of the third heat exchange section is connected to the second heat exchange part of the first heat exchange unit through the collecting member.

[0069] In the above technical solution, by making the second heat exchange part of the second heat exchange unit include a third heat exchange section, and making at least a portion of the third heat exchange section extend along the length direction of the box body, the bending portion of the second heat exchange unit can be conveniently connected to the collecting part, and at least a portion of the third heat exchange section extends along the length direction of the box body, so that the space in the length direction of the box body can be utilized.

[0070] In some embodiments, the heat exchange assembly further includes a connecting bracket, at least a portion of which is located between the bent portions of the two heat exchange units and connects the bent portions of the two heat exchange units.

[0071] In the above technical solution, by setting a connecting bracket and connecting the connecting bracket between the bent parts of the two heat exchange units, more connection positions can be provided between the multiple heat exchange units, and the bent parts of the two heat exchange units can be connected into a whole, thereby improving the stability of the connection between the multiple heat exchange units, and also making the structural strength or rigidity of the entire heat exchange component higher, thereby improving the structural stability of the entire heat exchange component. Since the structural strength or rigidity of the entire heat exchange component is higher, it is also convenient to install the heat exchange component into the box of the battery device.

[0072] In some embodiments, the ratio of the extension lengths of any two of the heat exchange units is 0.8 to 1.2.

[0073] In the above technical solution, by making the extension lengths of the multiple heat exchange units close, the heat exchange capacity of each heat exchange unit can be made equivalent, the heat exchange is more uniform, and the overall heat exchange capacity of the heat exchange assembly can be made stronger.

[0074] In some embodiments, a plurality of the heat exchange units are arranged in parallel.

[0075] In the above technical solution, by arranging multiple heat exchange units in parallel, the temperature of the heat exchange medium flowing in the heat exchange flow channel of each heat exchange unit can be made more consistent, and the heat exchange effect of each heat exchange unit can be made stronger.

[0076] In some embodiments, the heat exchange unit is formed as a heat exchange flat tube, the thickness direction of the heat exchange unit is consistent with the up and down direction, and at least one side surface of the heat exchange unit in the thickness direction is in thermal contact or thermal connection with the battery cell assembly.

[0077] In the above technical solution, by configuring the heat exchange unit as a heat exchange flat tube and making at least one side surface of the heat exchange unit in the thickness direction in thermal contact or thermal connection with the battery cell assembly, the heat conduction area between the heat exchange unit and the battery cell assembly can be increased, thereby improving the heat exchange efficiency of the heat exchange unit for the battery cell assembly.

[0078] In some embodiments, the surface of the heat exchange unit that is in thermal contact or thermal connection with the battery cell assembly is a heat exchange surface, and the heat exchange surface is a plane.

[0079] In the above technical solution, by setting the heat exchange surface of the heat exchange unit to a plane, the heat exchange unit can be better fitted with the battery cell, the heat conduction area between the heat exchange unit and the battery cell assembly is increased, and the heat exchange efficiency of the heat exchange unit for the battery cell assembly is improved.

[0080] In some embodiments, the battery cell assembly includes one or more battery cell rows arranged along a first direction, each of the battery cell rows includes a plurality of the battery cells arranged along a second direction, the first direction is the length direction of the box, and the second direction is the width direction of the box.

[0081] In the above technical solution, by setting the battery cell assembly to include one or more battery cell rows arranged along the first direction and each battery cell row including multiple battery cells arranged along the second direction, the multiple battery cells in the battery cell assembly can be arranged in an orderly and compact manner, thereby improving the capacity of the battery device; and, by arranging the multiple battery cell assemblies along the length direction of the box and arranging the multiple battery cells in each battery cell row along the width direction of the box, the space in the box can be fully utilized, so that the arrangement of the multiple battery cells in the box is relatively compact, which is beneficial to improving the energy density of the battery device.

[0082] In some embodiments, at least a portion of the heat exchange unit extends along the second direction.

[0083] In the above technical solution, by extending at least a portion of the heat exchange unit along the arrangement direction of the multiple battery cells in a single battery cell row, the arrangement direction of the multiple battery cells in the battery cell row can be made to intersect with at least a portion of the pipeline of the heat exchange unit, and each heat exchange unit can be made to achieve thermal contact with the multiple battery cells in a single battery cell row as much as possible, so that a single heat exchange unit can exchange heat with the multiple battery cells in the battery cell row, which can improve the heat exchange efficiency and make the heat exchange of the multiple battery cells in the battery cell row more uniform.

[0084] In some embodiments, the heat exchange assembly is arranged on at least one side of the battery cell assembly in the up-down direction.

[0085] In the above technical solution, by arranging the heat exchange assembly on at least one side of the battery cell assembly in the up and down directions, the overall layout of the heat exchange assembly and the battery cell assembly can be made compact, which is also beneficial for the heat exchange assembly and the battery cell assembly to have a larger heat exchange contact area, thereby improving the temperature regulation effect of the heat exchange assembly on the battery cell assembly.

[0086] In some embodiments, the sum of the projected areas of all the heat exchange units along the vertical direction is a first projected area, the sum of the projected areas of all the battery cells along the vertical direction is a second projected area, and the ratio of the first projected area to the second projected area is greater than 1 / 3.

[0087] In the above technical solution, by making the ratio of the sum of the projected areas of all heat exchange units in the up and down directions to the sum of the projected areas of all battery cells in the up and down directions greater than 1 / 3, the heat conduction area between the heat exchange unit and the battery cell assembly can be made larger, so that the heat exchange efficiency of the heat exchange assembly for the battery cell assembly is higher.

[0088] In some embodiments, the heat exchange component is disposed in the box.

[0089] In the above technical solution, by arranging the heat exchange assembly in the box, the heat exchange assembly and the battery cell assembly can be better thermally contacted, the thermal resistance between the heat exchange assembly and the battery cell assembly can be reduced, and the heat exchange efficiency can be improved.

[0090] In a second aspect, the present application provides an electrical device, including: a battery device according to an embodiment of the first aspect of the present application.

[0091] In the above technical solution, by providing the above-mentioned battery device, the space occupied by the current collector of the battery device in the height direction is smaller, which can be beneficial to the effective utilization of the space within the battery device, and is beneficial to reducing the overall height size of the battery device, thereby reducing the restrictions on the installation and use scenarios of the battery device, and is beneficial to improving the energy density of the battery device.

[0092] In some embodiments, the electrical device is a vehicle, the longitudinal direction of the vehicle is the first direction, and the transverse direction of the vehicle is the second direction.

[0093] In the above technical solution, when the battery device is used in a vehicle, due to its small height, it occupies less space in the height direction of the vehicle, which is beneficial to the layout of other components of the vehicle and reduces the risk of the bottom of the battery device being scratched.

[0094] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0096] Figure 1 is a schematic diagram of a battery device according to some embodiments of the present application;

[0097] Figure 2 is an exploded view of a battery device according to some embodiments of the present application;

[0098] Figure 3 is an exploded view of a battery device according to some embodiments of the present application from another angle;

[0099] Figure 4 is a partial structural schematic diagram of a battery device according to some embodiments of the present application;

[0100] Figure 5 is an exploded view of a partial structure of a battery device according to some embodiments of the present application;

[0101] Figure 6 is a perspective view of a heat exchange assembly of a battery device according to some embodiments of the present application;

[0102] Figure 7 yes Figure 6 Enlarged view of point K in the middle;

[0103] Figure 8 is an exploded view of a heat exchange assembly of a battery device according to some embodiments of the present application;

[0104] Figure 9 is a schematic diagram of a current collecting member in a battery device according to some embodiments of the present application;

[0105] Figure 10 is a schematic diagram of a connection bracket in a battery device according to some embodiments of the present application;

[0106] Figure 11 is a front view of a heat exchange assembly of a battery device according to some embodiments of the present application;

[0107] Figure 12 It is along Figure 11 Cross-sectional view along the mid-GG line;

[0108] Figure 13 yes Figure 12 Enlarged view of J in the middle;

[0109] Figure 14 yes Figure 12 Enlarged view of point H in the middle;

[0110] Figure 15 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0111] Reference numerals:

[0112] 1000. Electrical devices;

[0113] 100. Battery device;

[0114] 10. Box body; 11. Bottom plate; 111. Raised rib; 112. Receiving groove; 12. Mounting beam; 13. Top cover;

[0115] 20. Battery monomer assembly;

[0116] 30. Battery cell row; 301. Battery cell;

[0117] 50. Heat exchange components;

[0118] 5. Heat exchange unit; 51a. Heat exchange channel; 511a. Sub-channel; 5b. Diverter rib; 51. First heat exchange portion; 52. Second heat exchange portion; 53. Bend portion; 531. First heat exchange section; 532. Second heat exchange section; 533. Third heat exchange section; 54. Heat exchange surface; 55. Connecting end; 56. First surface;

[0119] 501, first heat exchange unit; 502, second heat exchange unit; 503, gap;

[0120] 6. Current collecting part; 61. Liquid inlet; 62. Liquid outlet; 63. Liquid outlet cavity; 64. Current collecting port;

[0121] 7. Connecting bracket; 71. Bracket plate; 72. Side flange; 73. Second surface;

[0122] 200. Car body. DETAILED DESCRIPTION

[0123] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0124] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0125] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0126] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0127] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0128] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0129] The term "plurality" used in this application refers to two or more (including two).

[0130] In the embodiments of the present application, unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0131] In the embodiments of the present application, unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0132] In an embodiment of the present application, a battery apparatus (Battery Apparatus) may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and a plurality of battery cells are connected in series, in parallel, or in mixed connection through a busbar component. For example, a battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells; a battery cell assembly may be a battery module (Battery Module), and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module can be formed by bundling a plurality of battery cells by cable ties.

[0133] In the embodiments of the present application, the battery cells may be secondary batteries, which are batteries that can be recharged to activate the active materials after discharge and continue to be used. The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., although the embodiments of the present application are not limited thereto. The battery cells may be flat, rectangular, etc.

[0134] The battery device may be a battery pack, which includes a housing and one or more battery cell assemblies housed in the housing. The battery cell assemblies may be battery modules, which may be housed in the housing by securing the battery module to the housing; or the battery cell assembly may be housed in the housing by directly securing multiple battery cells to the housing.

[0135] In an embodiment of the present application, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form an enclosed space within the housing to accommodate the battery cell assembly. Enclosed here means covered or closed, and may be sealed or unsealed. The first housing may be a top cover or a bottom plate. For example, the housing may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame to form an enclosed space within the housing to accommodate the battery cell assembly.

[0136] In the embodiment of the present application, the box body can be used as part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0137] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0138] Currently, market developments indicate that batteries are becoming increasingly widely used. Batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0139] In related technologies, to ensure that battery devices operate within a suitable temperature range, a heat exchange assembly is typically installed to exchange heat with the battery cells of the battery device to regulate the temperature of the battery cells. The introduction of a heat exchange assembly increases the size of the entire battery device. Therefore, after incorporating a heat exchange assembly into a battery device to exchange heat between the battery cells, how to effectively utilize the space within the battery device to reduce its size has become a pressing technical challenge.

[0140] Based on this, the present application proposes a battery device, which includes: a box body, a battery cell assembly and a heat exchange assembly. The battery cell assembly is arranged in the box body, and the battery cell assembly includes multiple battery cells. The heat exchange assembly is used to exchange heat with the battery cell assembly, and the heat exchange assembly includes multiple heat exchange units and multiple collecting parts. Each heat exchange unit is formed as a heat exchange tube and each heat exchange unit has a heat exchange flow channel. At least part of the heat exchange unit is bent and extended. Each heat exchange unit has two connecting ends in the extension direction, and each current collecting part has two collecting ports. The two connecting ends of each heat exchange unit are respectively connected to the collecting ports of different current collecting parts. Multiple current collecting parts connect multiple heat exchange units in sequence, and multiple collecting parts are arranged in a horizontal direction.

[0141] In the above technical solution, the heat exchange component in the battery device is configured to include multiple heat exchange units and multiple current collecting pieces, and the multiple heat exchange units are connected in sequence through multiple current collecting pieces. The heat exchange medium flowing in the multiple heat exchange units can be introduced and led out in an orderly manner through the multiple current collecting pieces. By optimizing the structure of the heat exchange component, the current collecting pieces are configured to be arranged in a horizontal direction, which can fully utilize the horizontal space in the battery device. This can reduce the space in the height direction occupied by the current collecting pieces, which can be beneficial to achieving effective utilization of the space in the battery device, reducing the overall height size of the battery device, and improving the energy density of the battery device.

[0142] The vehicle disclosed in the embodiment of the present application may be a new energy vehicle, which may be a pure electric vehicle, a hybrid electric vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom of the vehicle. The battery device may be used to power the vehicle, for example, it may be used as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle. The battery device may not only serve as a driving power source for the vehicle, but also as an operating power source for the vehicle. The vehicle may further include a controller and a motor, and the controller is used to control the battery device to power the motor, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0143] Reference below Figures 1-14 A battery device 100 according to an embodiment of the present application is described.

[0144] In the following description of the present application, the width direction of the heat exchange unit 5, the extension direction of the heat exchange unit 5 and the thickness direction of the heat exchange unit 5 are perpendicular to each other, and the battery cell 301 can be thermally connected or thermally contacted with at least one side of the heat exchange unit 5 in the thickness direction.

[0145] In the following description of this application, the first direction can refer to the X direction in the accompanying drawings, the second direction can refer to the Y direction in the accompanying drawings, the up and down directions can refer to the Z direction in the accompanying drawings, and the thickness direction of the heat exchange unit 5 can be consistent with the up and down direction (Z direction).

[0146] In the following description of this application, the height direction refers to the up-down direction of the battery device in a normal use state.

[0147] Reference Figure 1-Figure 5In a first aspect, an embodiment of the present application provides a battery device 100, which includes a housing 10, a battery cell assembly 20, and a heat exchange assembly 50. The battery cell assembly 20 is disposed in the housing 10, and the battery cell assembly 20 includes a plurality of battery cells 301. The heat exchange assembly 50 is used to exchange heat with the battery cell assembly 20, and the heat exchange assembly 50 includes a plurality of heat exchange units 5 and a plurality of current collectors 6. Each heat exchange unit 5 is formed as a heat exchange tube and each heat exchange unit 5 has a heat exchange flow channel 51a. At least a portion of the heat exchange unit 5 is bent and extended. Each heat exchange unit 5 has two connecting ends 55 in the extension direction. Each current collector 6 has two current collecting ports 64. The two connecting ends 55 of each heat exchange unit 5 are respectively connected to the current collecting ports 64 of different current collectors 6. The multiple current collectors 6 connect the multiple heat exchange units 5 in sequence, and the multiple current collectors 6 are arranged in a horizontal direction.

[0148] The heat exchange assembly 50 is used to exchange heat with the battery cell assembly 20, which can be understood as: a thermally conductive relationship exists between the heat exchange assembly 50 and the battery cell assembly 20, such as thermally conductive contact or thermally conductive connection between the heat exchange assembly 50 and the battery cell assembly 20, thereby achieving heat exchange between the heat exchange assembly 50 and the battery cell assembly 20. The heat exchange assembly 50 can be used to increase the temperature of the battery cell 301, or it can be used to reduce the temperature of the battery cell 301, and the temperature of the heat exchange assembly 50 can be determined based on the ambient temperature of the battery device 100 and the temperature of the battery device 100 itself.

[0149] The heat exchange medium can be one or more of liquid, solid, and gas. For example, the heat exchange medium can include water or a mixture of water and other liquids. In the process of the heat exchange medium flowing along the heat exchange channel 51a of the heat exchange unit 5, the heat exchange medium can take away the heat generated by the battery cell 301 or the heat exchange medium can heat the battery cell 301.

[0150] Each heat exchange unit 5 is formed as a heat exchange tube, which can make the arrangement of the heat exchange unit 5 more flexible. For example, the flow path or flow direction of the heat exchange channel 51a in the heat exchange unit 5 can be bent according to the needs of the heat exchange unit 5, that is, the heat exchange channel 51a in the heat exchange unit 5 can be flexibly bent and arranged according to design requirements.

[0151] The at least partial bending and extension of the heat exchange unit 5 can be a partial bending and extension of the heat exchange unit 5, or the entire heat exchange unit 5 can be bent and extended. This can increase the length of a single heat exchange unit 5, thereby increasing the heat exchange area between the single heat exchange unit 5 and the battery cell assembly 20.

[0152] The partial current collectors 6 can be used to introduce the heat exchange medium into the heat exchange flow channels 51a of the heat exchange units 5, and the partial current collectors 6 can be used to lead the heat exchange medium flowing through the heat exchange units 5 out. For example, one partial current collector 6 has a liquid inlet cavity, and another partial current collector 6 has a liquid outlet cavity 63. The heat exchange medium can flow into the liquid inlet cavity of the partial current collector 6, and the heat exchange medium flowing into the liquid inlet cavity flows into the plurality of heat exchange units 5. The heat exchange medium flowing through the plurality of heat exchange units 5 flows into the liquid outlet cavity 63 of the other partial current collector 6.

[0153] The plurality of current collectors 6 connect the plurality of heat exchange units 5 in sequence. The number of the current collectors 6 can be the same as the number of the heat exchange units 5. In the direction in which the plurality of heat exchange units 5 are connected in sequence, two adjacent heat exchange units 5 can be connected by one current collector 6. The two ends of each heat exchange unit 5 in the extension direction are respectively connected ends 55. The connected ends 55 of each heat exchange unit 5 are connected to the current collectors 6. For example, one connected end 55 of each heat exchange unit 5 is connected to the current collector 6 having the liquid inlet cavity, and the other connected end 55 of each heat exchange unit 5 is connected to the current collector 6 having the liquid outlet cavity 63.

[0154] Each current collector 6 has at least two current collector ports 64. The two current collector ports 64 of each current collector 6 can be connected to different two heat exchange units 5. The two current collector ports 64 of some current collectors 6 can be used as delivery ports for delivering the heat exchange medium to the heat exchange units 5. The two current collector ports 64 of some current collectors 6 can be used as output ports for the heat exchange units 5 to output the heat exchange medium to the current collectors 6.

[0155] The arrangement of the plurality of current collectors 6 in the horizontal direction can include the following cases. The plurality of current collectors 6 can be arranged in a row or a column in a set direction. The plurality of current collectors 6 can be staggered. The plurality of current collectors 6 can also be arranged in an irregular form.

[0156] The arrangement of the plurality of current collectors 6 in the horizontal direction can reduce the space occupied by the plurality of current collectors 6 in the height direction. This can be conducive to effectively utilizing the space in the battery device 100 and reducing the overall height of the battery device 100.

[0157] In addition, the flow collecting module of the heat exchange component 50 is configured as a plurality of separate flow collecting parts 6, which can reduce the structural complexity of the flow collecting parts 6, thereby reducing the difficulty of the production and manufacturing process of the flow collecting parts 6, compared with integrating the plurality of flow collecting parts 6 into a flow collecting module as a whole (integrating the plurality of flow collecting parts 6 into a flow collecting module as a whole requires considering and setting the sealing and partitioning between the different cavities in the flow collecting module, which is complex in structure and difficult in processing and manufacturing process). Moreover, the flow collecting module of the heat exchange component 50 is configured as a plurality of separate flow collecting parts 6, which can reduce or avoid the mutual influence between the flow collecting parts 6, for example, it can reduce or avoid the influence between the flow collecting part 6 with the liquid inlet cavity and the flow collecting part 6 with the liquid outlet cavity 63, for example, it can avoid or reduce the temperature transfer between the flow collecting part 6 with the liquid inlet cavity and the flow collecting part 6 with the liquid outlet cavity 63, thereby affecting the heat exchange effect of the heat exchange medium (the temperature of the heat exchange medium in the liquid inlet cavity is significantly different from the temperature of the heat exchange medium in the liquid outlet cavity 63).

[0158] Furthermore, by configuring the current collecting module of the heat exchange assembly 50 as a plurality of separate current collecting parts 6, compared to integrating the plurality of current collecting parts 6 into a current collecting module as a whole, the size of a single current collecting part 6 can be reduced relative to the entire current collecting module as a whole. For example, the size of a single current collecting part 6 in the height direction can be reduced, so that a single current collecting part 6 can be made thinner, realizing a flat design of a single current collecting part 6, and reducing the space occupied by a single current collecting part 6 in the height direction. At the same time, since the plurality of current collecting parts 6 are arranged in the horizontal direction, the space occupied by the plurality of current collecting parts 6 in the height direction does not increase significantly compared to the space occupied by a single current collecting part 6 in the height direction, and the space occupied by the current collecting parts 6 of the heat exchange assembly 50 in the height direction can be reduced, which can be beneficial to achieving effective utilization of the space within the battery device 100 and reducing the overall height dimension of the battery device 100.

[0159] In the above technical solution, the heat exchange assembly 50 in the battery device 100 is configured to include a plurality of heat exchange units 5 and a plurality of current collecting pieces 6, and the plurality of heat exchange units 5 are sequentially connected through the plurality of current collecting pieces 6. The heat exchange medium flowing in the plurality of heat exchange units 5 can be introduced and led out in an orderly manner through the plurality of current collecting pieces 6. By optimizing the structure of the heat exchange assembly, the current collecting pieces 6 are configured to be arranged in a horizontal direction, so that the horizontal space in the battery device 100 can be fully utilized. This can reduce the space in the height direction occupied by the current collecting pieces 6, which can be beneficial to the effective utilization of the space in the battery device 100, the reduction of the overall height size of the battery device 100, and the improvement of the energy density of the battery device 100.

[0160] In some embodiments, the height difference between any two current collecting members 6 in the vertical direction is less than or equal to 2 mm.

[0161] It should be noted that the height difference between the two current collecting members 6 in the vertical direction represents the distance between the center positions of the two current collecting members 6 in the vertical direction. Alternatively, in other embodiments, the height difference between the two current collecting members 6 in the vertical direction may be the distance between the upper surfaces of the two current collecting members 6. The height difference may be calibrated to represent the distance between the same position of the current collecting member 6 in the vertical direction.

[0162] For example, the height difference between the center positions of any two current collecting members 6 in the vertical direction may be 2 mm, 1.8 mm, 1.5 mm, 1.2 mm, 1.0 mm, 0.8 mm, 0.5 mm, 0.2 mm, 0 mm, etc.

[0163] The height difference between the center positions of any two current collecting members 6 in the vertical direction can be understood as the distance between the center positions of any two current collecting members 6 in the vertical direction in the height direction.

[0164] In the above technical solution, by designing the positional relationship of multiple current collecting parts 6 in the height direction, the height difference between the center positions of any two current collecting parts 6 in the height direction is less than or equal to 2 mm. In this way, the multiple current collecting parts 6 arranged in the horizontal direction can be arranged at approximately the same height, thereby better reducing the space occupied by the multiple current collecting parts 6 in the height direction, which is more conducive to reducing the overall height size of the battery device 100.

[0165] In some embodiments, the difference in thickness between any two current collecting members 6 in the vertical direction is less than or equal to 2 mm.

[0166] For example, the difference in thickness between any two current collecting members 6 in the up-down direction may be 2 mm, 1.8 mm, 1.5 mm, 1.2 mm, 1.0 mm, 0.8 mm, 0.5 mm, 0.2 mm, 0 mm, etc.

[0167] The difference in thickness between any two current collecting members 6 in the up-down direction may be understood as the absolute value of the difference in thickness between any two current collecting members 6 in the up-down direction.

[0168] In the above technical solution, by designing the dimensional relationship of multiple current collecting parts 6 in the height direction, the difference in thickness between any two current collecting parts 6 in the height direction is less than or equal to 2 mm. The thickness of multiple current collecting parts 6 in the height direction can be made smaller or generally consistent, thereby better reducing the space occupied by multiple current collecting parts 6 in the height direction, which is more conducive to reducing the overall height size of the battery device 100.

[0169] In some embodiments, reference Figure 13 The thickness dimension of a single current collecting member 6 in the up and down direction is i, and i is less than or equal to 14 mm.

[0170] In the above technical solution, by designing the thickness dimension of a single current collecting member 6 in the height direction, the thickness dimension of a single current collecting member 6 in the height direction is made less than or equal to 14 mm, so that a single current collecting member 6 occupies a smaller space in the height direction, and at the same time, multiple current collecting members 6 are arranged in the horizontal direction. While making full use of the horizontal space in the battery device 100, the space occupied by multiple current collecting members 6 in the height direction can be effectively reduced. For example, the space dimension occupied by multiple current collecting members 6 in the height direction can be about 14 mm, which is more conducive to reducing the overall height dimension of the battery device 100.

[0171] In some embodiments, reference Figure 13 The thickness dimension i of a single current collecting member 6 in the vertical direction ranges from 8 mm to 13 mm.

[0172] For example, the thickness dimension i of a single current collecting member 6 in the up and down direction can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, etc.

[0173] In the above technical solution, on the basis of limiting the thickness dimension of a single current collecting part 6 in the height direction to be less than or equal to 14 mm, the thickness dimension range of a single current collecting part 6 in the height direction is further set to 8 mm to 13 mm. While making the thickness dimension of a single current collecting part 6 in the height direction smaller to reduce the space occupied by multiple current collecting parts 6 in the height direction, the wall thickness of a single current collecting part 6, the size of the internal cavity, etc. can be taken into account to meet the design requirements. For example, it can avoid the situation where the structural strength of the current collecting part 6 is low and the internal cavity size is small due to the small thickness dimension of a single current collecting part 6 in the height direction, which fails to meet the design requirements.

[0174] In some embodiments, each current collecting member 6 has the same specifications.

[0175] In the above technical solution, by making each current collecting member 6 the same, the specifications and types of the current collecting members 6 can be reduced, the types of molds for manufacturing the current collecting members 6 can be reduced, and the cost can be reduced.

[0176] In some embodiments, reference Figure 13 The ratio of the thickness dimension i of a single current collecting member 6 in the vertical direction to the thickness dimension t of a single heat exchange unit 5 in the vertical direction is less than 1.8.

[0177] In the above technical solution, by designing the relationship between the thickness dimension of a single current collecting part 6 in the height direction and the thickness dimension of a single heat exchange unit 5 in the height direction, the ratio of the thickness dimension of a single current collecting part 6 in the height direction to the thickness dimension of a single heat exchange unit 5 in the height direction is less than 1.8, so that the thickness dimension of a single current collecting part 6 in the height direction can be made smaller, so that the space occupied by a single current collecting part 6 in the height direction is smaller, and at the same time, multiple current collecting parts 6 are arranged in the horizontal direction. While making full use of the horizontal space in the battery device 100, the space occupied by multiple current collecting parts 6 in the height direction can be effectively reduced, which is more conducive to reducing the overall height dimension of the battery device 100.

[0178] In some embodiments, the ratio of the thickness of a single current collecting member 6 in the vertical direction to the thickness of a single heat exchange unit 5 in the vertical direction is in the range of 1.2 to 1.7.

[0179] For example, the ratio of the thickness of a single current collecting member 6 in the up-down direction to the thickness of a single heat exchange unit 5 in the up-down direction may be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, etc.

[0180] In the above technical solution, on the basis of limiting the ratio of the thickness dimension of a single collecting part 6 in the height direction to the thickness dimension of a single heat exchange unit 5 in the height direction to be less than 1.8, the ratio of the thickness dimension of a single collecting part 6 in the height direction to the thickness dimension of a single heat exchange unit 5 in the height direction is further limited to a range of 1.2 to 1.7. While making the thickness dimension of a single collecting part 6 in the height direction smaller to reduce the space occupied by multiple collecting parts 6 in the height direction, the wall thickness of a single collecting part 6, the size of the internal cavity, etc. can be taken into account to meet the design requirements. For example, it can avoid the situation where the structural strength of the collecting part 6 is low and the internal cavity size is small due to the small thickness dimension of a single collecting part 6 in the height direction, which fails to meet the design requirements.

[0181] In some embodiments, reference Figure 6-Figure 9 The two collecting ports 64 of a single collecting member 6 are located on opposite sides of the collecting member 6 .

[0182] In the technical scheme, the two collecting ports 64 of the single collecting piece 6 are located on opposite sides of the single collecting piece 6, and when the two heat exchange units 5 are connected to the two collecting ports 64 of the single collecting piece 6, the two heat exchange units 5 are connected to the collecting ports 64 of the single collecting piece 6 from opposite sides of the single collecting piece 6, so that the difficulty of the connection process caused by the interference between the two heat exchange units 5 and the single collecting piece 6 is reduced, and the difficulty of the connection operation of the two heat exchange units 5 and the single collecting piece 6 is reduced, so that the connection operation of the two heat exchange units 5 and the single collecting piece 6 is more convenient.

[0183] In some embodiments, referring to Figure 13 The connecting end 55 of the heat exchange unit 5 is inserted into the collecting port 64.

[0184] In the technical scheme, the connecting end 55 of the heat exchange unit 5 is inserted into the collecting port 64, which facilitates the connection of the heat exchange unit 5 and the collecting piece 6, and increases the connection area of the heat exchange unit 5 and the collecting piece 6, so that the connection is more stable.

[0185] In some embodiments, the connecting end 55 is welded to the collecting piece 6.

[0186] In the technical scheme, the connecting end 55 of the heat exchange unit 5 is welded to the collecting piece 6, which makes the connection of the heat exchange unit 5 and the collecting piece 6 reliable. In addition, since the thickness of the heat exchange unit 5 and the collecting piece 6 is small, the welding connection method makes the connection operation more convenient, and also avoids the risk of leakage of the heat exchange medium caused by the need to set a connection hole for fastener connection.

[0187] In some embodiments, referring to Figure 6 At least part of the collecting pieces 6 are arranged at intervals.

[0188] At least part of the collecting pieces 6 are arranged at intervals, which can include the following cases: part of the collecting pieces 6 are arranged at intervals, or all of the collecting pieces 6 are arranged at intervals.

[0189] In the technical scheme, at least part of the collecting pieces 6 are arranged at intervals, which can reduce the mutual influence between the collecting pieces 6, and make full use of the horizontal space in the battery device 100, so that the collecting pieces 6 can more flexibly use the horizontal space in the battery device.

[0190] In some embodiments, referring to Figure 6At least part of the current collectors 6 are arranged along a first direction, and the first direction is a length direction of the box 10.

[0191] The arrangement of the at least part of the current collectors 6 along the first direction can include the following cases: part of the current collectors 6 are arranged along the first direction, or all of the current collectors 6 are arranged along the first direction.

[0192] The first direction is parallel to a horizontal direction.

[0193] In the above technical solution, by arranging at least part of the current collectors 6 along the length direction of the box 10 of the battery device 100, the space in the length direction of the box 10 can be fully utilized, and the effective and sufficient utilization of the space in the box 10 by the plurality of current collectors 6 is further improved, which is more conducive to improving the energy density of the battery device 100.

[0194] In some embodiments, referring to Figure 6 Along the first direction, the positions of the at least two current collectors 6 in a second direction are at least partially staggered, and the second direction is a width direction of the box 10.

[0195] The second direction is parallel to the horizontal direction.

[0196] The positions of the at least two current collectors 6 in the second direction are at least partially staggered, which can include the following cases: the positions of two current collectors 6 in the second direction are partially staggered; or, the positions of two current collectors 6 in the second direction are completely staggered; or, the positions of any two current collectors 6 in the second direction are partially staggered; or, the positions of any two current collectors 6 in the second direction are completely staggered; or, the positions of part of the current collectors 6 in the second direction are partially staggered, and the positions of part of the current collectors 6 in the second direction are completely staggered.

[0197] In the above technical solution, the positions of the at least two current collectors 6 in the width direction of the box body 10 are at least partially staggered in the length direction of the box body 10, so that the space in the width direction of the box body 10 can be fully utilized, the effective and sufficient utilization of the space in the box body 10 by the plurality of current collectors 6 is further improved, the energy density of the battery device 100 is more conducive to being improved, and the layout of the plurality of current collectors 6 is more flexible. In addition, by at least partially staggering the positions of the at least two current collectors 6 in the width direction of the box body 10, the connection of the plurality of current collectors 6 with the plurality of external pipelines is facilitated, the interference and difficult layout problems of the external pipelines connected with different current collectors 6 are reduced, for example, due to the at least partially staggered positions of the at least two current collectors 6 in the width direction of the box body 10, at least part of the plurality of external pipelines connected with the plurality of current collectors 6 can be arranged in the width direction of the box body 10, the space in the width direction of the box body 10 is better utilized, the occupation of the height space in the battery device 100 by the plurality of external pipelines connected with the plurality of current collectors 6 is reduced, and the overall height of the battery device 100 is conducive to being reduced.

[0198] In some embodiments, with reference to Figure 11 , at least part of the current collectors 6 have a liquid inlet cavity and a liquid inlet port 61 communicating with the liquid inlet cavity, and at least part of the current collectors 6 have a liquid outlet cavity 63 and a liquid outlet port 62 communicating with the liquid outlet cavity 63; wherein the positions of the liquid inlet ports 61 or the liquid outlet ports 62 of two current collectors 6 adjacent in the first direction are staggered in the second direction, and the second direction is the width direction of the box body 10.

[0199] The positions of the liquid inlet ports 61 or the liquid outlet ports 62 of two current collectors 6 adjacent in the first direction being staggered in the second direction includes the following cases: for example, the two adjacent current collectors 6 each have a liquid inlet port 61, and the positions of the liquid inlet ports 61 of the two adjacent current collectors 6 are staggered in the second direction; for example, the two adjacent current collectors 6 each have a liquid outlet port 62, and the positions of the liquid outlet ports 62 of the two adjacent current collectors 6 are staggered in the second direction; for example, one of the two adjacent current collectors 6 has a liquid inlet port 61 and the other of the two adjacent current collectors 6 has a liquid outlet port 62, and the positions of the liquid inlet port 61 and the liquid outlet port 62 of the two adjacent current collectors 6 are staggered in the second direction.

[0200] In the technical solution, the liquid inlet 61 or the liquid outlet 62 of the two adjacent current collectors 6 are staggered in the second direction, which facilitates the connection of the liquid inlet 61 or the liquid outlet 62 of the plurality of current collectors 6 with the plurality of external pipelines, reduces the interference and difficult layout of the external pipelines connected with the different current collectors 6, for example, due to the staggered position of the at least two current collectors 6 in the width direction of the box 10, at least part of the plurality of external pipelines connected with the plurality of current collectors 6 can be arranged in the width direction of the box 10, which better utilizes the space in the width direction of the box 10, reduces the occupation of the height space in the battery device 100 by the plurality of external pipelines connected with the plurality of current collectors 6, and is beneficial to reduce the overall height of the battery device 100.

[0201] In some embodiments, referring to Figure 6-Figure 8 , the two current collection ports 64 of the single current collector 6 are located on opposite sides of the current collector 6 in the second direction, and the second direction is the width direction of the box 10.

[0202] In the technical solution, the positions of the two current collection ports 64 of the single current collector 6 are designed so that the two current collection ports 64 of the single current collector 6 are located on opposite sides of the current collector 6 in the width direction of the box 10. When the two heat exchange units 5 in the plurality of heat exchange units 5 are connected with the two current collection ports 64 of the single current collector 6 respectively, the two heat exchange units 5 can be connected with the current collection ports 64 of the current collector 6 from opposite sides of the current collector 6 respectively, which reduces the difficulty of the connection process caused by the interference of the two heat exchange units 5 with the same current collector 6, thereby reducing the difficulty of the connection operation of the two heat exchange units 5 with the same current collector 6, and making the connection operation of the two heat exchange units 5 with the same current collector 6 more convenient. In addition, the two current collection ports 64 of the single current collector 6 are located on opposite sides of the current collector 6 in the width direction of the box 10, which fully utilizes the space in the width direction of the box 10, and makes the overall structure of the battery device 100 more compact.

[0203] In some embodiments, referring to Figure 5 and Figure 6 , the plurality of current collectors 6 are located at the same end of the heat exchange assembly 50 in the first direction, and the first direction is the length direction of the box 10.

[0204] In the above technical solution, by locating multiple collecting parts 6 at the same end of the heat exchange component 50 along the length direction of the box body 10, the multiple collecting parts 6 are respectively connected to multiple external pipes, so that the multiple connection positions of the heat exchange component 50 and the external pipes are arranged at the same end of the heat exchange component 50, which is convenient for connecting the heat exchange component 50 with the external pipe. For example, when the battery device 100 is used in a vehicle and the first direction is the longitudinal direction of the vehicle, it is convenient to connect the heat exchange component 50 of the battery device 100 with the external pipe on the vehicle body 200.

[0205] In some embodiments, reference Figure 6 , multiple heat exchange units 5 are connected end to end in sequence through multiple collecting pieces 6 to form a ring structure.

[0206] Among them, multiple heat exchange units 5 are connected end to end through multiple collecting parts 6 to form a ring structure. The multiple heat exchange units 5 are straightened and unfolded. The ring structure formed by connecting multiple heat exchange units 5 end to end through multiple collecting parts 6 can appear ring-shaped in appearance.

[0207] In the above technical solution, multiple heat exchange units 5 are connected end to end in sequence through multiple collecting pieces 6 to form a ring structure, so that the connection operation of multiple heat exchange units 5 and multiple collecting pieces 6 is relatively simple and the structure formed by the connection is also relatively simple.

[0208] In some embodiments, at least part of the collecting member 6 has a liquid inlet cavity and a liquid inlet port 61 connected to the liquid inlet cavity, at least part of the collecting member 6 has a liquid outlet cavity 63 and a liquid outlet port 62 connected to the liquid outlet cavity 63, one of the two connecting ends 55 of each heat exchange unit 5 is connected to the liquid inlet cavity through the collecting port 64 and the other of the two connecting ends 55 of each heat exchange unit 5 is connected to the liquid outlet cavity 63 through the collecting port 64.

[0209] In the above technical solution, by making the two connecting ends 55 of each heat exchange unit 5 connected to different collecting parts 6 respectively, and making the two connecting ends 55 of each heat exchange unit 5 connected to the liquid inlet cavity and the liquid outlet cavity 63 of different collecting parts 6 respectively, the heat exchange medium flowing into the liquid inlet cavity of one of the collecting parts 6 can flow into the heat exchange unit 5, and the heat exchange medium flows through the heat exchange unit 5 and then flows into the liquid outlet cavity 63 of another collecting part 6, thereby realizing the flow circulation of the heat exchange medium in the heat exchange unit 5. In this way, the parallel setting of multiple heat exchange units 5 can be realized, so that the temperature of the heat exchange medium flowing in the multiple heat exchange units 5 is close, so that the temperature adjustment of the battery cell assembly 20 by the multiple heat exchange units 5 can be more uniform. In addition, by forming the liquid inlet cavity and the liquid outlet cavity 63 on different collecting parts 6, the mutual influence between the heat exchange medium in the liquid inlet cavity and the heat exchange medium in the liquid outlet cavity 63 can be reduced. For example, the heat exchange between the heat exchange medium in the liquid inlet cavity and the heat exchange medium in the liquid outlet cavity 63 can be reduced or avoided to affect the temperature regulation efficiency of the heat exchange medium for the battery cell 301.

[0210] In some embodiments, reference Figure 6-Figure 8 There are two heat exchange units 5 and two collecting pieces 6, one of which has a liquid inlet cavity and a liquid inlet 61 communicating with the liquid inlet cavity, and the other has a liquid outlet cavity 63 and a liquid outlet 62 communicating with the liquid outlet cavity 63.

[0211] In the above technical solution, by setting two heat exchange units 5 and two current collecting parts 6, the structure of the heat exchange component 50 can be made simpler, and by connecting the two connection ends 55 of each heat exchange unit 5 to the two current collecting parts 6 respectively, the two heat exchange units 5 can be set in parallel, so that the temperatures of the heat exchange media flowing in the two heat exchange units 5 are close, so that the temperature regulation of the battery cell assembly 20 by the two heat exchange units 5 can be more uniform.

[0212] In some embodiments, reference Figure 6-Figure 8 The heat exchange assembly 50 includes a connecting bracket 7 , and a connecting bracket 7 is connected between at least two heat exchange units 5 .

[0213] The material of the connecting bracket 7 can be the same as that of the heat exchange unit 5 .

[0214] In the above technical solution, by providing a connecting bracket 7, a connecting bracket 7 is connected between at least two heat exchange units 5, which can provide more connection positions between the multiple heat exchange units 5, thereby improving the stability of the connection between the multiple heat exchange units 5, and also making the structural strength or rigidity of the entire heat exchange component 50 higher, thereby improving the structural stability of the entire heat exchange component 50. Since the structural strength or rigidity of the entire heat exchange component 50 is higher, it is also convenient to install the heat exchange component 50 into the box 10 of the battery device 100.

[0215] In some embodiments, the connecting bracket 7 is connected to the heat exchange unit 5 by welding.

[0216] In the above technical solution, the thickness of the heat exchange unit 5 and the size of the connecting bracket 7 are both relatively small. By welding the connecting bracket 7 to the heat exchange unit 5, the connection between the connecting bracket 7 and the heat exchange unit 5 can be made more convenient and stable. Compared with the fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set a connection hole for the fastener connection.

[0217] In some embodiments, reference Figure 6-Figure 8 At least a portion of the connecting bracket 7 is located in the gap 503 between the corresponding two heat exchange units 5 .

[0218] In the above technical solution, by making at least a portion of the connecting bracket 7 located within the gap 503 between the corresponding two heat exchange units 5, the gap 503 between the heat exchange units 5 can be fully utilized, and the additional space occupied by the connecting bracket 7 can be reduced. For example, the space occupied in the height direction of the battery device 100 can be reduced, which is conducive to reducing the overall height size of the battery device 100.

[0219] In some embodiments, the dimension of the connecting bracket 7 in the vertical direction is less than or equal to the thickness dimension of the heat exchange unit 5 in the vertical direction.

[0220] In the above technical solution, on the basis of locating at least a portion of the connecting bracket 7 within the gap 503 between the corresponding two heat exchange units 5, the height dimension of the connecting bracket 7 is made less than or equal to the thickness dimension of the heat exchange unit 5 in the height direction. This allows the entire connecting bracket 7 to be located within the gap 503 between the heat exchange unit 5 brackets, making more effective use of the gap 503 between the heat exchange units 5 and being more conducive to reducing the additional space occupied by the connecting bracket 7. For example, it can reduce the space occupied in the height direction of the battery device 100, thereby helping to reduce the overall height dimension of the battery device 100.

[0221] In some embodiments, reference Figure 5 In the up and down direction, the surface of the heat exchange unit 5 facing the battery cell assembly 20 is the first surface 56, and the surface of the connecting bracket 7 facing the battery cell assembly 20 is the second surface 73. The second surface 73 is flush with the first surface 56 or the second surface 73 is located on the side of the first surface 56 away from the battery cell assembly 20.

[0222] The first surface 56 of the heat exchange unit 5 may constitute the heat exchange surface 54 .

[0223] For example, when the heat exchange assembly 50 is located on the lower side of the battery cell assembly 20, the above-mentioned first surface 56 is the upper surface of the heat exchange unit 5, and the above-mentioned second surface 73 is the upper surface of the connecting bracket 7. The upper surface of the connecting bracket 7 is flush with the upper surface of the heat exchange unit 5 or the upper surface of the connecting bracket 7 is lower than the upper surface of the heat exchange unit 5.

[0224] In the above technical solution, by ensuring that the surface of the connecting bracket 7 facing the battery cell assembly 20 does not protrude from the surface of the heat exchange unit 5 facing the battery cell assembly 20, the surface of the heat exchange unit 5 facing the battery cell assembly 20 can be fully in contact with the battery cell assembly 20, thereby reducing the thermal resistance between the heat exchange unit 5 and the battery cell assembly 20, improving the temperature regulation effect of the heat exchange unit 5 on the battery cell assembly 20, and avoiding the large gap 503 between the heat exchange unit 5 and the battery cell assembly 20 due to the surface of the connecting bracket 7 facing the battery cell assembly 20 protruding from the surface of the heat exchange unit 5 facing the battery cell assembly 20, thereby preventing sufficient contact and heat exchange.

[0225] In some embodiments, reference Figure 10 The connecting bracket 7 includes a bracket plate 71 and two side flanges 72 . The two side flanges 72 are connected to opposite sides of the bracket plate 71 , and the two side flanges 72 of the connecting bracket 7 are respectively connected to two adjacent heat exchange units 5 .

[0226] In the above technical solution, by setting the connecting bracket 7 to include a bracket plate 71 and two sides connected to the opposite sides of the bracket plate 71, it is convenient to connect the connecting bracket 7 to the heat exchange unit 5 through the side flange 72, and it also makes the structure of the connecting bracket 7 relatively simple and convenient to process and manufacture.

[0227] In some embodiments, reference Figure 11 The heat exchange unit 5 includes a first heat exchange part 51 and a second heat exchange part 52. The first heat exchange parts 51 of the multiple heat exchange units 5 jointly enclose a frame-shaped area, the second heat exchange parts 52 of the multiple heat exchange units 5 are all located in the frame-shaped area, and the second heat exchange parts 52 of the multiple heat exchange units 5 are all bent and extended.

[0228] In the above technical solution, by setting the heat exchange unit 5 to include a first heat exchange part 51 and a second heat exchange part 52, and making the second heat exchange parts 52 of multiple heat exchange units 5 located in the frame area surrounded by the first heat exchange part 51, and at the same time making the second heat exchange part 52 bend and extend, the arrangement of multiple heat exchange units 5 can be made compact, and the arrangement density of the heat exchange component 50 per unit area can be increased, thereby improving the heat exchange capacity of the heat exchange component 50 per unit area, and improving the heat exchange efficiency of the heat exchange component 50 for the battery cell component 20.

[0229] In some embodiments, reference Figure 11 The frame area is a rectangular frame area, and the size f1 of the rectangular frame area in the first direction is larger than the size f2 of the rectangular frame area in the second direction. The first direction is the length direction of the box body 10, and the second direction is the width direction of the box body 10.

[0230] In the above technical solution, by making the frame area enclosed by the first heat exchange parts 51 of the multiple heat exchange units 5 a rectangular frame area, the frame area enclosed by the first heat exchange parts 51 of the multiple heat exchange units 5 can be made similar to the shape of the box body 10, so that the overall contour shape of the heat exchange component 50 can be made similar to the shape of the box body 10, so that the heat exchange component 50 fully utilizes the space in the box body 10, so that the heat exchange component 50 has a larger heat exchange area, and the heat exchange capacity of the heat exchange component 50 is improved; in addition, by making the overall contour shape of the heat exchange component 50 similar to the shape of the box body 10, the heat exchange between the heat exchange component 50 and the battery cell component 20 in the box body 10 can also be made more uniform.

[0231] In some embodiments, reference Figure 11 The second heat exchange portion 52 includes a bending portion 53, the bending portion 53 includes a plurality of first heat exchange sections 531 and a second heat exchange section 532, the plurality of first heat exchange sections 531 are arranged at intervals along the first direction and each first heat exchange section 531 extends along the second direction, and the second heat exchange section 532 is connected between the same ends of two adjacent first heat exchange sections 531 along the second direction.

[0232] In the above technical solution, by setting the bending and extending manner of the bent and extended second heat exchange part 52 to include a plurality of first heat exchange segments 531 arranged along the first direction and a second heat exchange segment 532 connected between adjacent first heat exchange segments 531, the second heat exchange part 52 can be made to have a longer extension length per unit area, thereby making the heat exchange area per unit area of ​​the second heat exchange part 52 larger and the heat exchange capacity stronger, thereby improving the heat exchange efficiency of the heat exchange unit 5 for the battery cell assembly 20.

[0233] In some embodiments, reference Figure 11 , the second heat exchange section 532 extends in an arc shape.

[0234] In the above technical solution, by making the second heat exchange section 532 connected between adjacent first heat exchange sections 531 extend in an arc shape, the connection between adjacent first heat exchange sections 531 can be made smoother, and the heat exchange medium flowing in the second heat exchange section 532 can also be made smoother, thereby reducing the flow resistance of the heat exchange medium between the two adjacent first heat exchange sections 531, which is beneficial to improving the heat exchange effect of the heat exchange unit 5.

[0235] In some embodiments, reference Figure 11 The distance d1 between two adjacent first heat exchange sections 531 in the first direction is greater than the width W of the first heat exchange section 531 .

[0236] In the above technical solution, by making the distance between two adjacent first heat exchange sections 531 greater than the width of the first heat exchange section 531, the difficulty of the bending process of the second heat exchange section 52 can be reduced in the process of bending the second heat exchange section 52 to form multiple first heat exchange sections 531 and second heat exchange sections 532.

[0237] In some embodiments, reference Figure 11 , the ratio of the extension length L of the first heat exchange section 531 to the extension length L of the second heat exchange section 532 is 0.7-2.

[0238] For example, the ratio of the extension length of the first heat exchange section 531 to the extension length of the second heat exchange section 532 is 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 2, etc.

[0239] In the above technical solution, by making the ratio of the extension length of the first heat exchange section 531 to the extension length of the second heat exchange section 532 be 0.7 to 2, the extension length of the second heat exchange section 532 connected between two adjacent first heat exchange sections 531 can be made longer. In the process of bending the second heat exchange section 52 to form multiple first heat exchange sections 531 and second heat exchange sections 532, the difficulty of the bending process of the second heat exchange section 52 can be reduced.

[0240] In some embodiments, reference Figure 11 There are two heat exchange units 5 and two current collecting pieces 6. The first heat exchange parts 51 of the two heat exchange units 5 are connected through one of the current collecting pieces 6, the second heat exchange parts 52 of the two heat exchange units 5 are connected through another current collecting piece 6, and the bending parts 53 of the two heat exchange units 5 are arranged along the first direction.

[0241] In the above technical solution, by providing two heat exchange units 5 and two current collecting members 6, the structure of the heat exchange assembly 50 can be made simpler; and the bending portions 53 of the two heat exchange units 5 are arranged along the length direction of the box body 10, which can make full use of the length direction space of the box body 10. While making the arrangement of the two heat exchange units 5 more compact, it is also beneficial to improve the energy density of the battery device 100.

[0242] In some embodiments, reference Figure 11 The two heat exchange units 5 are respectively a first heat exchange unit 501 and a second heat exchange unit 502. The second heat exchange part 52 of the second heat exchange unit 502 also includes a third heat exchange section 533. At least a portion of the third heat exchange section 533 extends along the first direction. One end of the third heat exchange section 533 is connected to the bending part 53 of the second heat exchange unit 502, and the other end of the third heat exchange section 533 is connected to the second heat exchange part 52 of the first heat exchange unit 501 through the collecting member 6.

[0243] In the above technical solution, by making the second heat exchange part 52 of the second heat exchange unit 502 include a third heat exchange section 533, and making at least part of the third heat exchange section 533 extend along the length direction of the box body 10, the bending part 53 of the second heat exchange unit 502 can be conveniently connected to the collecting part 6, and at least part of the third heat exchange section 533 extends along the length direction of the box body 10, so that the space in the length direction of the box body 10 can be utilized.

[0244] In some embodiments, reference Figure 6 and Figure 7 The heat exchange assembly 50 further includes a connecting bracket 7 , at least a portion of which is located between the bending portions 53 of the two heat exchange units 5 and connects the bending portions 53 of the two heat exchange units 5 .

[0245] In the above technical solution, by providing a connecting bracket 7 and connecting the connecting bracket 7 between the bending parts 53 of the two heat exchange units 5, more connection positions can be provided between the multiple heat exchange units 5, and the bending parts 53 of the two heat exchange units 5 can be connected into a whole, thereby improving the stability of the connection between the multiple heat exchange units 5, and also making the structural strength or rigidity of the entire heat exchange component 50 higher, thereby improving the structural stability of the entire heat exchange component 50. Since the structural strength or rigidity of the entire heat exchange component 50 is higher, it is also convenient to install the heat exchange component 50 into the box 10 of the battery device 100.

[0246] In some embodiments, the ratio of the extension lengths of any two heat exchange units 5 is 0.8-1.2.

[0247] For example, the ratio of the extension lengths of any two heat exchange units 5 is 0.8, 0.9, 1, 1.1, 1.2, and so on.

[0248] In the above technical solution, by making the extension lengths of the multiple heat exchange units 5 close, the heat exchange capacity of each heat exchange unit 5 can be made equivalent, the heat exchange is more uniform, and the overall heat exchange capacity of the heat exchange assembly 50 can be made stronger.

[0249] In some embodiments, multiple heat exchange units 5 are arranged in parallel.

[0250] For example, the heat exchange medium can flow into the liquid inlet cavity in part of the collecting member 6, and the heat exchange medium entering the liquid inlet cavity flows into the heat exchange flow channel 51a of multiple heat exchange units 5. The heat exchange medium flowing through multiple heat exchange units 5 converges into the liquid outlet cavity 63 of another part of the collecting member 6, thereby realizing the circulation flow of the heat exchange medium in multiple heat exchange units 5, and the heat exchange medium can flow through multiple heat exchange units 5 at the same time, reducing the temperature difference of the heat exchange medium between the heat exchange units 5, so that the temperature of multiple heat exchange units 5 is roughly the same.

[0251] For example, there can be two heat exchange units 5, and the two heat exchange units 5 are arranged in parallel. There are two collecting pieces 6, one of which has a liquid inlet cavity and the other has a liquid outlet cavity 63. Each heat exchange unit 5 has connecting ends 55 at both ends, and the two connecting ends 55 of each heat exchange unit 5 are respectively connected to the two collecting pieces 6, so that the two heat exchange units 5 can be arranged in parallel.

[0252] In the above technical solution, by arranging a plurality of heat exchange units 5 in parallel, the temperature of the heat exchange medium flowing in the heat exchange channel 51a of each heat exchange unit 5 can be made more consistent, and the heat exchange effect of each heat exchange unit 5 can be made stronger.

[0253] In some embodiments, the heat exchange unit 5 is formed as a heat exchange flat tube, the thickness direction of the heat exchange unit 5 is consistent with the up and down direction, and at least one side surface of the heat exchange unit 5 in the thickness direction is in thermal contact or thermal connection with the battery cell assembly 20.

[0254] The cross section of the heat exchange flat tube can be rectangular.

[0255] The heat exchange unit 5 is in thermal contact with the battery cell assembly 20 , and the heat exchange unit 5 may be in direct contact with the battery cell assembly 20 .

[0256] The heat exchange unit 5 and the battery cell assembly 20 are thermally connected, and the heat exchange unit 5 and the battery cell assembly 20 can be thermally connected through a thermal conductive structure, for example, the heat exchange unit 5 and the battery cell assembly 20 are thermally connected through a thermal conductive adhesive layer.

[0257] In the above technical solution, by configuring the heat exchange unit 5 as a heat exchange flat tube and making at least one side surface of the heat exchange unit 5 in the thickness direction in thermal contact or thermal connection with the battery cell assembly 20, the heat conduction area between the heat exchange unit 5 and the battery cell assembly 20 can be increased, thereby improving the heat exchange efficiency of the heat exchange unit 5 for the battery cell assembly 20.

[0258] In some embodiments, reference Figure 3-Figure 6 The surface where the heat exchange unit 5 is in thermal contact or thermal connection with the battery cell assembly 20 is a heat exchange surface 54 , and the heat exchange surface 54 is a plane.

[0259] At least one surface of the heat exchange unit 5 in the thickness direction is formed as a heat exchange surface 54 , and the heat exchange surface 54 is in thermal contact or thermal connection with the battery cell assembly 20 .

[0260] In the above technical solution, by setting the heat exchange surface 54 of the heat exchange unit 5 as a plane, the heat exchange unit 5 can be better fitted with the battery cell 301, thereby increasing the heat conduction area between the heat exchange unit 5 and the battery cell assembly 20, and improving the heat exchange efficiency of the heat exchange unit 5 for the battery cell assembly 20.

[0261] In some embodiments, reference Figure 11-14 The heat exchange channel 51a of the heat exchange unit 5 is provided with one or more diverter ribs 5b spaced apart along the width direction of the heat exchange channel 51a, and the diverter ribs 5b extend along the extending direction of the heat exchange channel 51a.

[0262] The diverter rib 5b can be integrally formed with the heat exchange channel 51a.

[0263] In the above technical solution, by arranging a diverter rib 5b extending along the extension direction of the heat exchange channel 51a in the heat exchange channel 51a, the flow area of ​​the heat exchange channel 51a can be divided to achieve a smaller flow area, which is beneficial to improving the heat exchange effect between the heat exchange channel 51a and the battery cell assembly 20; and the structural strength of the heat exchange channel 51a can be improved.

[0264] In some embodiments, reference Figure 14 The diverter ribs 5b divide the heat exchange channel 51a into a plurality of sub-channels 511a that are arranged side by side and isolated from each other. The plurality of sub-channels 511a are arranged along the width direction of the heat exchange channel 51a.

[0265] In the above technical solution, the heat exchange channel 51a is divided into a plurality of sub-channels 511a arranged side by side and separated from each other by the diverter ribs 5b arranged in the heat exchange channel 51a. The heat exchange medium in the heat exchange channel 51a can flow along the plurality of sub-channels 511a with smaller flow areas, thereby further improving the heat exchange effect between the heat exchange channel 51a and the battery cell assembly 20; and, the structural strength of the heat exchange channel 51a can be further improved.

[0266] In some embodiments, reference Figure 14 The heat exchange channel 51a is formed as a heat exchange flat tube, and the ratio of the thickness dimension e1 of the diverter rib 5b in the width direction of the heat exchange channel 51a to the wall thickness e2 of the heat exchange flat tube is 0.7-1.2.

[0267] For example, the ratio of the thickness of the diverter rib 5b in the width direction of the heat exchange channel 51a to the wall thickness of the heat exchange flat tube is 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0268] In the above technical solution, by configuring the heat exchange channel 51a as a heat exchange flat tube, the heat conduction area between the heat exchange channel 51a and the battery cell assembly 20 can be increased, thereby improving the heat exchange efficiency of the heat exchange unit 5 for the battery cell assembly 20. Furthermore, by ensuring that the ratio of the thickness dimension of the diverter rib 5b in the width direction of the heat exchange channel 51a to the wall thickness of the heat exchange flat tube is 0.7 to 1.2, the diverter rib 5b can have a higher structural strength and can also be made to occupy less space in the heat exchange channel 51a.

[0269] In some embodiments, reference Figure 3-Figure 5 The battery cell assembly 20 includes one or more battery cell rows 30 arranged along a first direction, each battery cell row 30 includes a plurality of battery cells 301 arranged along a second direction, the first direction is the length direction of the box body 10, and the second direction is the width direction of the box body 10.

[0270] When there are multiple battery cell assemblies 20 , the multiple battery cell assemblies 20 may be arranged along the first direction.

[0271] In the above technical solution, by setting the battery cell assembly 20 to include one or more battery cell rows 30 arranged along the first direction and each battery cell row 30 including a plurality of battery cells 301 arranged along the second direction, the plurality of battery cell rows 30 in the battery cell assembly 20 can be arranged in an orderly and compact manner, thereby improving the capacity of the battery device 100; and, by making the plurality of battery cell assemblies 20 arranged along the length direction of the box body 10 and making the plurality of battery cells 301 in each battery cell row 30 arranged along the width direction of the box body 10, the space inside the box body 10 can be fully utilized, so that the arrangement of the plurality of battery cells 301 inside the box body 10 is relatively compact, which is beneficial to improving the energy density of the battery device 100.

[0272] In some embodiments, reference Figure 3-Figure 6 , at least a portion of the heat exchange unit 5 extends along the second direction.

[0273] At least part of the heat exchange unit 5 extends along the second direction. For example, when the heat exchange unit 5 includes the above-mentioned first heat exchange section 531, the first heat exchange section 531 may extend along the second direction.

[0274] In the above technical solution, by extending at least a portion of the heat exchange unit 5 along the arrangement direction of the multiple battery cells 301 in a single battery cell row 30, the arrangement direction of the multiple battery cells 301 in the battery cell row 30 can be made to intersect with at least a portion of the pipeline of the heat exchange unit 5, and each heat exchange unit 5 can be made to achieve thermal contact with the multiple battery cells 301 in a single battery cell row 30 as much as possible, so that a single heat exchange unit 5 can exchange heat with the multiple battery cells 301 in the battery cell row 30, which can improve the heat exchange efficiency and make the heat exchange of the multiple battery cells 301 in the battery cell row 30 more uniform.

[0275] In some embodiments, reference Figure 3-Figure 5 The heat exchange assembly 50 is arranged on at least one side of the battery cell assembly 20 in the up-down direction.

[0276] For example, the heat exchange assembly 50 can be placed on one side of the battery cell assembly 20 along the up and down direction, for example, the heat exchange assembly 50 can be placed on the lower side of the battery cell assembly 20; the heat exchange assembly 50 can also be arranged on both sides of the battery cell assembly 20 along the up and down direction.

[0277] In the above technical solution, by arranging the heat exchange assembly 50 on at least one side of the battery cell assembly 20 in the up and down directions, the overall layout of the heat exchange assembly 50 and the battery cell assembly 20 can be made compact, which is also beneficial for the heat exchange assembly 50 and the battery cell assembly 20 to have a larger heat exchange contact area, thereby improving the temperature regulation effect of the heat exchange assembly 50 on the battery cell assembly 20.

[0278] In some embodiments, the sum of the projected areas of all heat exchange units 5 along the vertical direction is the first projected area, the sum of the projected areas of all battery cells 301 along the vertical direction is the second projected area, and the ratio of the first projected area to the second projected area is greater than 1 / 3.

[0279] For example, the ratio of the first projected area to the second projected area is 2 / 5, 1 / 2, 3 / 5, 2 / 3, 4 / 5, etc.

[0280] In the above technical solution, by making the ratio of the sum of the projected areas of all heat exchange units 5 in the up and down directions to the sum of the projected areas of all battery cells 301 in the up and down directions greater than 1 / 3, the heat conduction area between the heat exchange unit 5 and the battery cell assembly 20 can be made larger, so that the heat exchange efficiency of the heat exchange assembly 50 for the battery cell assembly 20 is higher.

[0281] In some embodiments, reference Figures 1-4 The heat exchange component 50 is disposed in the box body 10.

[0282] In the above technical solution, by arranging the heat exchange assembly 50 in the box body 10, the heat exchange assembly 50 and the battery cell assembly 20 can be better thermally contacted, the thermal resistance between the heat exchange assembly 50 and the battery cell assembly 20 can be reduced, and the heat exchange efficiency can be improved.

[0283] In some embodiments, reference Figure 2-Figure 3 A receiving groove 112 is formed on the inner wall of the box body 10 . The shape of the receiving groove 112 matches the shape of the heat exchange unit 5 , and the heat exchange unit 5 is arranged in the receiving groove 112 .

[0284] The shape of the accommodating groove 112 is adapted to the shape of the heat exchange unit 5 , including: the extension trajectory of the accommodating groove 112 is consistent with the extension trajectory of the heat exchange unit 5 .

[0285] In the above technical solution, by providing a receiving groove 112 for arranging the heat exchange unit 5 on the inner wall of the box body 10, the installation and positioning of the heat exchange unit are facilitated.

[0286] In some embodiments, reference Figure 2-Figure 3 The inner wall of the box body 10 is formed with a plurality of ribs 111 , and the plurality of ribs 111 cooperate to define a receiving groove 112 .

[0287] In the above technical solution, a plurality of ribs 111 are formed on the inner wall of the box body 10 and the accommodating groove 112 is defined by the cooperation of the plurality of ribs 111, so that the forming process of the accommodating groove 112 is more convenient, and the plurality of ribs 111 can improve the structural strength of the box body 10.

[0288] In some embodiments, reference Figure 2-Figure 3 , part of the box body 10 protrudes inward to form a plurality of ribs 111.

[0289] In the above technical solution, by making part of the box body 10 protrude inward to form multiple ribs 111, the processing and formation of the ribs 111 are facilitated, and while the structural strength of the box body 10 is improved by the multiple ribs 111, the weight of the box body 10 will not be increased.

[0290] In some embodiments, reference Figure 2-Figure 3 The box body 10 includes a bottom plate 11 , and the heat exchange assembly 50 is installed on the bottom plate 11 .

[0291] For example, the heat exchange assembly 50 is installed on the upper side of the base plate 11 .

[0292] The bottom plate 11 of the box body 10 is located below the battery cell assembly 20 to support the battery cell assembly 20 .

[0293] In the above technical solution, by setting the heat exchange component 50 on the bottom plate 11 of the box body 10, the heat exchange component 50 is located at a lower position in the box body 10, which facilitates the installation and fixation of the heat exchange component 50 and makes the center of gravity of the battery device 100 lower, more stable and reliable.

[0294] In some embodiments, reference Figure 2-Figure 3 A mounting beam 12 is provided on the bottom plate 11. The mounting beam 12 is arranged on opposite sides of the heat exchange assembly 50 along the second direction and extends along the first direction. The battery cell assembly 20 is connected to the mounting beam 12. The second direction intersects with the first direction.

[0295] In the above technical solution, by providing the mounting beams 12 on the bottom plate 11 , it is convenient to install and fix the battery cell assembly 20 on the bottom plate 11 .

[0296] In some embodiments, a ratio of a dimension of the box body 10 in a first direction to a dimension of the box body 10 in a second direction is greater than 2, and the second direction intersects the first direction.

[0297] For example, the ratio of the size of the box body 10 in the first direction to the size of the box body 10 in the second direction is 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, etc.

[0298] In the above technical solution, by making the size of the box 10 of the battery device 100 in the first direction significantly larger than the size of the box 10 in the second direction, the battery device 100 can be made roughly rectangular as a whole. When the battery device 100 is applied to a vehicle, the first direction of the box 10 can be placed along the longitudinal direction of the vehicle, which can fully utilize the longitudinal space of the vehicle and is conducive to increasing the capacity of the battery device 100.

[0299] In some embodiments, the ratio of the size of the box body 10 in the up-down direction to the size of the box body 10 in the second direction is less than 0.3, and the second direction is the width direction of the box body 10 .

[0300] In the above-described technical solution, by making the dimensions of the box 10 smaller in the vertical direction, the battery device 100 can be made flat as a whole. When the battery device 100 is used in a vehicle, the space occupied by the battery device 100 in the Z direction of the vehicle can be reduced, which is beneficial to the layout of other components in the vehicle. Furthermore, when the battery device 100 is installed at the bottom of the vehicle, since the battery device 100 occupies a smaller space in the Z direction, the bottom surface height of the battery device 100 will not be too low to be easily scratched and damaged. Therefore, the risk of the battery device 100 being scratched and damaged during driving of the vehicle can be reduced.

[0301] Secondly, refer to Figure 15The present application provides an electrical device 1000 , comprising: a battery device 100 according to the first embodiment of the present application.

[0302] In the above technical solution, by providing the above-mentioned battery device 100, the space occupied by the current collecting member 6 of the battery device 100 in the height direction is smaller, which can be beneficial to the effective utilization of the space within the battery device 100, and is beneficial to reducing the overall height size of the battery device 100, thereby reducing the restrictions on the installation and use scenarios of the battery device 100, and is beneficial to improving the energy density of the battery device 100.

[0303] In some embodiments, the electrical device 1000 is a vehicle, the longitudinal direction of the vehicle is the first direction, and the transverse direction of the vehicle is the second direction.

[0304] For example, the battery device 100 may be provided at the bottom of the vehicle body 200 .

[0305] When the battery device 100 is used in a vehicle, the longitudinal direction of the vehicle refers to the arrangement direction of the head and tail of the vehicle. The transverse direction of the vehicle is perpendicular to the longitudinal direction of the vehicle and perpendicular to the up-down direction. The up-down direction can refer to the Z direction in the accompanying drawings. The longitudinal direction of the vehicle is the first direction, and the transverse direction of the vehicle is the second direction.

[0306] In the above technical solution, when the battery device 100 is used in a vehicle, since the battery device 100 has a small height dimension, it occupies less space in the height direction of the vehicle, which is beneficial to the layout of other components of the vehicle and reduces the risk of the bottom of the battery device 100 being scratched.

[0307] Refer to the following Figures 1-14 A battery device 100 according to some embodiments of the present application is described.

[0308] Reference Figures 1-14 In this embodiment, the battery device 100 includes a housing 10, a plurality of battery cell assemblies 20, and a heat exchange assembly 50. The plurality of battery cell assemblies 20 are housed within the housing 10 and arranged along a first direction. Each battery cell assembly 20 includes two rows of battery cells 30. The two rows 30 of each battery cell assembly 20 are arranged along the first direction. Each row 30 includes a plurality of battery cells 301 arranged along a second direction. The thickness of the battery cells 301 aligns with the second direction. The heat exchange assembly 50 is disposed within the housing 10 and below the battery cell assembly 20.

[0309] The box body 10 comprises a bottom plate 11 and a top cover 13, the top cover 13 is arranged on the upper side of the bottom plate 11 and is connected with the bottom plate 11, the top cover 13 and the bottom plate 11 are detachably connected, the bottom plate 11 and the top cover 13 jointly define a space for accommodating the battery monomer assembly 20. The bottom plate 11 is provided with a mounting beam 12, the mounting beam 12 is arranged on the opposite sides of the battery monomer assembly 20 along the second direction, and the battery monomer assembly 20 is connected with the mounting beam 12.

[0310] The size of the battery monomer 301 in the up-down direction is smaller than the size of the battery monomer 301 in the first direction, and the number of each column of battery monomer rows 30 can be 15-20. The ratio of the size of the box body 10 in the first direction to the size of the box body 10 in the second direction is greater than 2, and the ratio of the size of the box body 10 in the up-down direction to the size of the box body 10 in the second direction is less than 0.3, and the whole battery device 100 is in a rectangular flat shape.

[0311] The heat exchange assembly 50 is fixedly installed on the bottom plate 11, and the heat exchange assembly 50 is in heat conduction connection with the battery monomer assembly 20. The heat exchange assembly 50 comprises two heat exchange units 5 and two current collectors 6, the two current collectors 6 are arranged along the first direction, one of the two current collectors 6 is formed with a liquid inlet cavity and a liquid inlet 61, the other current collector 6 is formed with a liquid outlet cavity 63 and a liquid outlet 62, and the two connecting ends 55 of each heat exchange unit 5 are connected with the two current collectors 6 respectively.

[0312] Each heat exchange unit 5 is formed as a heat exchange flat tube, and a heat exchange flow channel 51a is formed in each heat exchange unit 5. Each heat exchange unit 5 comprises a first heat exchange part 51 and a second heat exchange part 52, the first heat exchange parts 51 of the two heat exchange units 5 jointly surround a frame-shaped area, the second heat exchange parts 52 of the two heat exchange units 5 are located in the frame-shaped area, and the second heat exchange parts 52 of the two heat exchange units 5 are bent and extended. The frame-shaped area is a rectangular frame-shaped area, and the size of the rectangular frame-shaped area in the first direction is greater than the size of the rectangular frame-shaped area in the second direction. The second heat exchange part 52 comprises a bent part 53, the bent part 53 comprises a plurality of first heat exchange segments 531 and a second heat exchange segment 532, the plurality of first heat exchange segments 531 are arranged at intervals along the first direction and each first heat exchange segment 531 extends along the second direction, and the second heat exchange segment 532 is connected between the same end of the adjacent two first heat exchange segments 531 along the second direction.

[0313] The bent parts 53 of the two heat exchange units 5 are arranged along the first direction, and the heat exchange assembly 50 further comprises a connecting bracket 7, at least part of the connecting bracket 7 is located between the bent parts 53 of the two heat exchange units 5 and connects the bent parts 53 of the two heat exchange units 5.

[0314] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0315] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: Box; A battery cell assembly, the battery cell assembly being disposed in the box and comprising a plurality of battery cells; A heat exchange assembly, which is used to exchange heat with the battery cell assembly, and the heat exchange assembly includes multiple heat exchange units and multiple collecting parts, each of the heat exchange units is formed as a heat exchange tube and has a heat exchange flow channel, at least part of the heat exchange unit is bent and extended, each of the heat exchange units has two connecting ends in the extension direction, each of the collecting parts has two collecting ports, the two connecting ends of each heat exchange unit are respectively connected to the collecting ports of different collecting parts, multiple collecting parts connect multiple heat exchange units in sequence, and multiple collecting parts are arranged in a horizontal direction.

2. The battery device according to claim 1, wherein: The height difference between any two current collecting members in the vertical direction is less than or equal to 2 mm.

3. The battery device according to claim 1, wherein: The difference in thickness between any two current collecting members in the vertical direction is less than or equal to 2 mm.

4. The battery device according to claim 1, wherein: The thickness of a single current collecting member in the up-down direction is less than or equal to 14 mm.

5. The battery device according to claim 4, characterized in that The thickness of a single current collecting member in the vertical direction ranges from 8 mm to 13 mm.

6. The battery device according to claim 1, wherein: The ratio of the thickness of a single current collecting member in the up-down direction to the thickness of a single heat exchange unit in the up-down direction is less than 1.

8.

7. The battery device according to claim 6, characterized in that The ratio of the thickness of a single current collecting member in the up-down direction to the thickness of a single heat exchange unit in the up-down direction is in the range of 1.2 to 1.

7.

8. The battery device according to claim 1, wherein: The two collecting ports of a single collecting member are located on opposite sides of the collecting member.

9. The battery device according to claim 1, wherein: The connecting end is inserted into the current collecting port; and / or the connecting end is welded to the current collecting member.

10. The battery device according to claim 1, wherein: At least some of the current collecting members are spaced apart.

11. The battery device according to claim 1, wherein: At least part of the current collecting members are arranged along a first direction, which is the length direction of the box body.

12. The battery device according to claim 11, wherein: Along the first direction, positions of at least two current collecting members in a second direction are at least partially staggered, and the second direction is the width direction of the box body.

13. The battery device according to claim 11, wherein: At least part of the current collecting parts has a liquid inlet cavity and a liquid inlet connected to the liquid inlet cavity, and at least part of the current collecting parts has a liquid outlet cavity and a liquid outlet connected to the liquid outlet cavity; wherein, the liquid inlets or the liquid outlets of the two adjacent current collecting parts in the first direction are staggered in the second direction, and the second direction is the width direction of the box body.

14. The battery device according to claim 11, wherein: The two collecting ports of a single collecting member are located on opposite sides of the collecting member along a second direction, and the second direction is a width direction of the box body.

15. The battery device according to claim 1, wherein: The plurality of current collecting members are located at the same end of the heat exchange assembly along a first direction, where the first direction is the length direction of the box body.

16. The battery device according to claim 1, wherein: The plurality of heat exchange units are connected end to end in sequence through the plurality of current collecting pieces to form a ring structure.

17. The battery device according to claim 1, wherein: At least part of the collecting parts has a liquid inlet cavity and a liquid inlet connected to the liquid inlet cavity, at least part of the collecting parts has a liquid outlet cavity and a liquid outlet connected to the liquid outlet cavity, one of the two connecting ends of each heat exchange unit is connected to the liquid inlet cavity through the collecting port, and the other of the two connecting ends of each heat exchange unit is connected to the liquid outlet cavity through the collecting port.

18. The battery device according to claim 17, characterized in that There are two heat exchange units and two collecting pieces, one of which has a liquid inlet cavity and a liquid inlet communicating with the liquid inlet cavity, and the other has a liquid outlet cavity and a liquid outlet communicating with the liquid outlet cavity.

19. The battery device according to claim 1, wherein: The heat exchange assembly includes a connecting bracket, and the connecting bracket is connected between at least two of the heat exchange units.

20. The battery device according to claim 19, wherein: The connecting bracket is connected to the heat exchange unit by welding.

21. The battery device according to claim 19, wherein: At least a portion of the connecting bracket is located in the gap between the corresponding two heat exchange units.

22. The battery device according to claim 21, characterized in that The dimension of the connecting bracket in the up-down direction is smaller than or equal to the thickness dimension of the heat exchange unit in the up-down direction.

23. The battery device according to claim 21, wherein: In the up and down direction, the surface of the heat exchange unit facing the battery cell assembly is the first surface, and the surface of the connecting bracket facing the battery cell assembly is the second surface. The second surface is flush with the first surface or the second surface is located on the side of the first surface away from the battery cell assembly.

24. The battery device according to claim 19, wherein: The connecting bracket includes a bracket plate and two side flanges. The two side flanges are connected to opposite sides of the bracket plate and are respectively connected to two adjacent heat exchange units.

25. The battery device according to claim 1, wherein The heat exchange unit includes a first heat exchange part and a second heat exchange part. The first heat exchange parts of the plurality of heat exchange units jointly enclose a frame-shaped area, and the second heat exchange parts of the plurality of heat exchange units are all located in the frame-shaped area and bend and extend.

26. The battery device according to claim 25, characterized in that The frame area is a rectangular frame area, the size of the rectangular frame area in a first direction is larger than the size of the rectangular frame area in a second direction, the first direction is the length direction of the box, and the second direction is the width direction of the box.

27. The battery device according to claim 25, characterized in that The second heat exchange portion includes a bending portion, which includes a plurality of first heat exchange segments and a second heat exchange segment. The plurality of first heat exchange segments are arranged at intervals along the first direction and each first heat exchange segment extends along the second direction. The second heat exchange segment is connected between the same ends of two adjacent first heat exchange segments along the second direction.

28. The battery device according to claim 27, characterized in that The second heat exchange section extends in an arc shape.

29. The battery device according to claim 27, wherein: The distance between two adjacent first heat exchange sections in the first direction is greater than the width of the first heat exchange section.

30. The battery device according to claim 27, wherein: The ratio of the extension length of the first heat exchange section to the extension length of the second heat exchange section is 0.7-2.

31. The battery device according to claim 27, wherein: There are two heat exchange units and two current collecting pieces. The first heat exchange parts of the two heat exchange units are connected through one of the current collecting pieces, the second heat exchange parts of the two heat exchange units are connected through the other current collecting piece, and the bending parts of the two heat exchange units are arranged along the first direction.

32. The battery device according to claim 31, wherein: The two heat exchange units are respectively a first heat exchange unit and a second heat exchange unit. The second heat exchange part of the second heat exchange unit also includes a third heat exchange section. At least a portion of the third heat exchange section extends along the first direction. One end of the third heat exchange section is connected to the bent portion of the second heat exchange unit and the other end of the third heat exchange section is connected to the second heat exchange part of the first heat exchange unit through the collecting member.

33. The battery device according to claim 31, wherein: The heat exchange assembly further includes a connecting bracket, at least a portion of which is located between the bent portions of the two heat exchange units and connects the bent portions of the two heat exchange units.

34. The battery device according to claim 1, wherein: The ratio of the extension lengths of any two heat exchange units is 0.8 to 1.

2.

35. The battery device according to claim 1, wherein: A plurality of the heat exchange units are arranged in parallel.

36. The battery device according to claim 1, wherein: The heat exchange unit is formed as a heat exchange flat tube, the thickness direction of the heat exchange unit is consistent with the up-down direction, and at least one side surface of the heat exchange unit in the thickness direction is in thermal contact or thermal connection with the battery cell assembly.

37. The battery device according to claim 1, wherein: The surface of the heat exchange unit that is in thermal contact or thermal connection with the battery cell assembly is a heat exchange surface, and the heat exchange surface is a plane.

38. The battery device according to claim 1, wherein: The battery cell assembly includes one or more battery cell rows arranged along a first direction, each of the battery cell rows includes a plurality of battery cells arranged along a second direction, the first direction is the length direction of the box, and the second direction is the width direction of the box.

39. The battery device according to claim 38, characterized in that At least a portion of the heat exchange unit extends along the second direction.

40. The battery device according to claim 1, wherein: The heat exchange assembly is arranged on at least one side of the battery cell assembly in the up-down direction.

41. The battery device according to claim 40, characterized in that The sum of the projected areas of all the heat exchange units along the vertical direction is a first projected area, the sum of the projected areas of all the battery cells along the vertical direction is a second projected area, and the ratio of the first projected area to the second projected area is greater than 1 / 3.

42. The battery device according to claim 1, wherein: The heat exchange component is arranged in the box.

43. An electrical device, characterized in that: A battery device comprising the battery device of any one of claims 1-42.

44. The electrical device according to claim 43, characterized in that: The electrical device is a vehicle, the longitudinal direction of the vehicle is a first direction, and the transverse direction of the vehicle is a second direction.

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