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] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] In related technologies, to ensure that the battery device operates within a suitable temperature range, heat exchange components are typically installed to exchange heat with the individual battery cells, thereby regulating the temperature of the individual cells. Introducing heat exchange components increases the overall size of the battery device. Therefore, after introducing heat exchange components to exchange heat with the individual battery cells, how to effectively utilize the internal space of the battery device to reduce its size has become a pressing technical problem to be solved. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device and an electrical device. By optimizing the structure of the heat exchange components, the battery device can effectively utilize the internal space, reduce the overall height of the battery device, and improve the energy density of the battery device.

[0004] In a first aspect, this application provides a battery device, comprising: a housing; a battery cell assembly disposed within the housing, the battery cell assembly comprising a plurality of battery cells; and a heat exchange assembly for exchanging heat with the battery cell assembly, the heat exchange assembly comprising a plurality of heat exchange units and a plurality of current collectors, each heat exchange unit being formed as a heat exchange tube and having a heat exchange flow channel, at least a portion of the heat exchange unit being bent and extended, each heat exchange unit having two connecting ends in its extension direction, each current collector having two current collection ports, the two connecting ends of each heat exchange unit being respectively connected to the current collection ports of different current collectors, the plurality of current collectors sequentially connecting the plurality of heat exchange units, and the plurality of current collectors being arranged in a horizontal direction.

[0005] In the above technical solution, by setting the heat exchange components in the battery device to include multiple heat exchange units and multiple current collectors, the multiple heat exchange units are connected sequentially through multiple current collectors, and the heat exchange medium flowing in the multiple heat exchange units can be orderly introduced and drawn out through multiple current collectors. By optimizing the structure of the heat exchange components and setting multiple current collectors to be arranged in the horizontal direction, the horizontal space in the battery device can be fully utilized. This can reduce the vertical space occupied by the current collectors, which is conducive to the effective utilization of the space in the battery device, reducing the overall height of the battery device, and improving the energy density of the battery device.

[0006] In some embodiments, the height difference between any two current collectors 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 collectors in the height direction, the height difference between the center positions of any two current collectors in the height direction is less than or equal to 2mm. This allows multiple current collectors arranged in the horizontal direction to be arranged at approximately the same height, thereby better reducing the space occupied by multiple current collectors in the height direction and making it more conducive to reducing the overall height of the battery device.

[0008] In some embodiments, the difference in thickness between any two current collectors 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 collectors in the height direction, the difference in thickness between any two current collectors in the height direction is less than or equal to 2mm. This makes the thickness of multiple current collectors in the height direction less different or roughly the same, thereby better reducing the space occupied by multiple current collectors in the height direction and making it more conducive to reducing the overall height of the battery device.

[0010] In some embodiments, the thickness of a single current collector in the vertical direction is less than or equal to 14 mm.

[0011] In the above technical solution, by designing the thickness of a single current collector in the height direction to be less than or equal to 14mm, the space occupied by a single current collector in the height direction is small. At the same time, multiple current collectors are arranged horizontally. While making full use of the horizontal space in the battery device, the space occupied by multiple current collectors in the height direction can be effectively reduced. For example, the space occupied by multiple current collectors in the height direction can be about 14mm, which is more conducive to reducing the overall height of the battery device.

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

[0013] In the above technical solution, based on limiting the thickness of a single current collector in the height direction to less than or equal to 14mm, the thickness range of a single current collector in the height direction is further set to 8mm to 13mm. While making the thickness of a single current collector in the height direction smaller to reduce the space occupied by multiple current collectors in the height direction, it can also ensure that the wall thickness and internal cavity size of a single current collector meet the design requirements. For example, it can avoid the situation where the structural strength of the current collector is low and the internal cavity size is small due to the small thickness of a single current collector in the height direction, thus failing to meet the design requirements.

[0014] In some embodiments, the ratio of the thickness dimension of a single manifold in the vertical direction to the thickness dimension of a single heat exchange unit in the vertical direction is less than 1.8.

[0015] In the above technical solution, by designing the relationship between the thickness of a single current collector in the height direction and the thickness of a single heat exchange unit in the height direction, the ratio of the thickness of a single current collector in the height direction to the thickness of a single heat exchange unit in the height direction is made less than 1.8. This results in a smaller thickness of the single current collector in the height direction, thus reducing the space occupied by the single current collector in the height direction. At the same time, multiple current collectors are arranged horizontally, which can make full use of the horizontal space within the battery device while effectively reducing the space occupied by multiple current collectors in the height direction, and is more conducive to reducing the overall height of the battery device.

[0016] In some embodiments, the ratio of the thickness dimension of a single manifold in the vertical direction to the thickness dimension of a single heat exchange unit in the vertical direction ranges from 1.2 to 1.7.

[0017] In the above technical solution, based on limiting the ratio of the thickness of a single manifold in the height direction to the thickness of a single heat exchange unit in the height direction to be less than 1.8, the ratio of the thickness of a single manifold in the height direction to the thickness of a single heat exchange unit in the height direction is further limited to a range of 1.2 to 1.7. This makes the thickness of a single manifold in the height direction smaller, thereby reducing the space occupied by multiple manifolds in the height direction, while also ensuring that the wall thickness of a single manifold and the size of its internal cavity meet the design requirements. For example, it can avoid the situation where the structural strength of the manifold is low and the internal cavity size is small due to the small thickness of a single manifold in the height direction, thus failing to meet the design requirements.

[0018] In some embodiments, the two collection ports of a single manifold are located on opposite sides of the manifold.

[0019] In the above technical solution, by designing the positions of the two collection ports of a single collector, the two collection ports of the single collector are located on opposite sides of the collector. When two heat exchange units in multiple heat exchange units are connected to the two collection ports of the single collector, the two heat exchange units can be connected to the collection ports of the collector from opposite sides of the collector, which can reduce the interference that occurs when two heat exchange units are connected to the same collector, thus reducing the difficulty of the connection process and making the connection operation of two heat exchange units to the same collector more convenient.

[0020] In some embodiments, the connector is inserted into the collection port.

[0021] In the above technical solution, by inserting the connection end of the heat exchange unit into the manifold, it is convenient to connect the heat exchange unit and the manifold, and the connection area between the heat exchange unit and the manifold can be increased, making the connection between the two more stable.

[0022] In some embodiments, the connecting end is welded to the current collector.

[0023] In the above technical solution, by welding the connection end of the heat exchange unit to the manifold, the connection between the heat exchange unit and the manifold can be made reliable. In addition, since the thickness of both the heat exchange unit and the manifold is small, welding the heat exchange unit to the manifold makes the connection operation more convenient. Moreover, compared with fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set connection holes for fastener connection.

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

[0025] In the above technical solution, by making at least some current collectors spaced apart, the mutual influence between multiple current collectors can be reduced. While arranging multiple current collectors in the horizontal direction, the horizontal space within the battery device is fully utilized, allowing the current collectors to make more flexible use of the horizontal space within the battery device.

[0026] In some embodiments, at least some of the current collectors are arranged along a first direction, which is the length direction of the housing.

[0027] In the above technical solution, by arranging at least some current collectors along the length of the battery pack, the space along the length of the pack can be fully utilized, further improving the effective utilization of the space inside the pack by multiple current collectors, which is more conducive to improving the energy density of the battery pack.

[0028] In some embodiments, along the first direction, at least two of the current collectors are at least partially offset in a second direction, which is the width direction of the housing.

[0029] In the above technical solution, by staggering the positions of at least two current collectors along the length of the housing at least partially along the width of the housing, the space in the width of the housing can be fully utilized, further improving the effective utilization of the internal space by multiple current collectors, which is more conducive to improving the energy density of the battery device and also makes the layout of multiple current collectors more flexible. Furthermore, by staggering the positions of at least two current collectors at least partially along the width of the housing, it is convenient for multiple current collectors to be connected to multiple external pipes, reducing interference and layout difficulties of external pipes connected to different current collectors. For example, since the positions of at least two current collectors at least partially staggered along the width of the housing, at least some of the multiple external pipes connected to multiple current collectors can also be arranged roughly along the width of the housing, making better use of the space in the width of the housing and reducing the occupation of the internal height space of the battery device by multiple external pipes connected to multiple current collectors, which is conducive to reducing the overall height of the battery device.

[0030] In some embodiments, at least some of the manifolds have a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, and at least some of the manifolds have a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber; wherein, the liquid inlets or liquid outlets of two adjacent manifolds in the first direction are staggered in the second direction, and the second direction is the width direction of the housing.

[0031] In the above technical solution, by staggering the positions of the inlet or outlet of two adjacent manifolds in the second direction, it is convenient to connect the inlet or outlet of multiple manifolds to multiple external pipes respectively, reducing the interference and layout problems of external pipes connected to different manifolds. For example, since at least two manifolds are at least partially staggered in the width direction of the housing, at least part of the multiple external pipes connected to multiple manifolds can also be arranged roughly along the width direction of the housing, making better use of the width direction space of the housing, and reducing the occupation of the internal height space of the battery device by the multiple external pipes connected to multiple manifolds, which is conducive to reducing the overall height of the battery device.

[0032] In some embodiments, the two collection ports of a single collection element are located on opposite sides of the collection element along a second direction, the second direction being the width direction of the housing.

[0033] In the above technical solution, by designing the positions of the two current collector ports of a single current collector so that they are located on opposite sides of the current collector along the width direction of the housing, when two heat exchange units among multiple heat exchange units are respectively connected to the two current collector ports of a single current collector, the two heat exchange units can be connected to the current collector ports from opposite sides of the current collector respectively. This reduces the interference that occurs when connecting two heat exchange units to the same current collector, thus reducing the difficulty of the connection process and making the connection operation between two heat exchange units and the same current collector more convenient. In addition, by positioning the two current collector ports of a single current collector on opposite sides of the current collector along the width direction of the housing, the space in the width direction of the housing can be fully utilized, making the overall structural layout of the battery device more compact.

[0034] In some embodiments, a plurality of the manifolds are located at the same end of the heat exchange assembly along a first direction, the first direction being the length direction of the housing.

[0035] In the above technical solution, by arranging multiple current collectors at the same end of the heat exchange assembly along the length of the housing, and connecting the multiple current collectors to multiple external pipes respectively, the multiple connection positions between the heat exchange assembly and the external pipes are arranged at the same end of the heat exchange assembly, which facilitates the connection between the heat exchange assembly and the external pipes. For example, when the battery device is used in a vehicle and the first direction is the longitudinal direction of the vehicle, it is convenient for the heat exchange assembly of the battery device to be connected to the external pipes on the vehicle body.

[0036] In some embodiments, a plurality of heat exchange units are connected end to end in a ring structure via a plurality of manifolds.

[0037] In the above technical solution, multiple heat exchange units are connected end to end to form a ring structure through multiple manifolds, which makes the connection operation of multiple heat exchange units and multiple manifolds relatively simple and the structure formed by the connection is also relatively simple.

[0038] In some embodiments, at least a portion of the manifold has a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, at least a portion of the manifold has a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber, one of the two connection ends of each heat exchange unit is communicating with the liquid inlet chamber through the manifold, and the other of the two connection ends of each heat exchange unit is communicating with the liquid outlet chamber through the manifold.

[0039] In the above technical solution, by connecting the two ends of each heat exchange unit to different manifolds, and by connecting the two ends of each heat exchange unit to the inlet and outlet chambers of different manifolds, the heat exchange medium flowing into the inlet chamber of one manifold can flow into the heat exchange unit. After flowing through the heat exchange unit, the heat exchange medium flows into the outlet chamber of another manifold, thereby achieving the circulation of the heat exchange medium within the heat exchange unit. This allows for the parallel arrangement of multiple heat exchange units, ensuring that the temperature of the heat exchange medium flowing within the multiple heat exchange units is similar, thus enabling more uniform temperature regulation of the battery cell assembly by the multiple heat exchange units. Furthermore, by forming the inlet and outlet chambers on different manifolds, the mutual influence between the heat exchange medium in the inlet and outlet chambers can be reduced. For example, heat exchange between the heat exchange medium in the inlet and outlet chambers can be reduced or avoided, thus reducing or preventing any impact on 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 manifolds, one of which has a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, and the other manifold has a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber.

[0041] In the above technical solution, by setting two heat exchange units and two current collectors, the structure of the heat exchange assembly can be simplified. Furthermore, by connecting the two connection ends of each heat exchange unit to the two current collectors respectively, the two heat exchange units can be connected in parallel, making the temperature of the heat exchange medium flowing in the two heat exchange units close, thereby enabling the two heat exchange units to regulate the temperature of the battery cell assembly more evenly.

[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 by a connecting bracket, which allows for more connection positions between multiple heat exchange units, thereby improving the stability of the connection between multiple heat exchange units and increasing the structural strength or rigidity of the entire heat exchange assembly. This also improves the structural stability of the entire heat exchange assembly. Due to the increased structural strength or rigidity of the entire heat exchange assembly, it is also convenient to install the heat exchange assembly into the battery device's housing.

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

[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. Moreover, compared with fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set connection holes for fastener connection.

[0046] In some embodiments, at least a portion of the connecting bracket is located within the gap between the corresponding two 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, reducing the additional space occupied by the connecting bracket. For example, it can reduce the space occupied in the height direction within the battery device, thereby helping to reduce the overall height of the battery device.

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

[0049] In the above technical solution, by placing at least a portion of the connecting bracket within the gap between the two corresponding heat exchange units, and simultaneously ensuring that the dimension of the connecting bracket in the height direction is less than or equal to the thickness dimension of the heat exchange unit in the height direction, the entire connecting bracket can be located within the gap between the heat exchange unit brackets. This allows for more efficient use of the gap between the heat exchange units and reduces the additional space occupied by the connecting bracket. For example, it can reduce the space occupied in the height direction within the battery device, thereby helping to reduce the overall height dimension of the battery device.

[0050] In some embodiments, in the vertical direction, the surface of the heat exchange unit facing the battery cell assembly is a first surface, and the surface of the connecting bracket facing the battery cell assembly is a second surface, wherein 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 does not protrude beyond the surface of the heat exchange unit facing the battery cell, sufficient contact can be achieved between the surface of the heat exchange unit facing the battery cell and the battery cell, reducing the thermal resistance between the heat exchange unit and the battery cell, improving the temperature regulation effect of the heat exchange unit on the battery cell, and avoiding the situation where the gap between the heat exchange unit and the battery cell is too large due to the surface of the connecting bracket facing the battery cell protruding beyond the surface of the heat exchange unit facing the battery cell, thus preventing insufficient contact and heat exchange.

[0052] In some embodiments, the connecting bracket includes a bracket plate and two side flanges, the two side flanges being connected to opposite sides of the bracket plate and 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 side flanges connected to opposite sides of the bracket plate, the connecting bracket can be easily connected to the heat exchange unit through the side flanges, and the structure of the connecting bracket is relatively simple and easy to process and manufacture.

[0054] In some embodiments, the heat exchange unit includes a first heat exchange section and a second heat exchange section, the first heat exchange sections of a plurality of heat exchange units together enclose a frame-shaped region, and the second heat exchange sections of a plurality of heat exchange units are all located within the frame-shaped region and extend in a bent manner.

[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 part of multiple heat exchange units located within the frame-shaped area enclosed by the first heat exchange part, and making the second heat exchange part bend and extend, the arrangement of multiple heat exchange units can be compact, which can increase the arrangement density of the heat exchange components per unit area, thereby improving the heat exchange capacity of the heat exchange components per unit area and improving the heat exchange efficiency of the heat exchange components for battery cells.

[0056] In some embodiments, the frame-shaped region is a rectangular frame region, the size of the rectangular frame region in a first direction is greater than the size of the rectangular frame region in a second direction, the first direction is the length direction of the box body, and the second direction is the width direction of the box body.

[0057] In the above technical solution, by making the frame-shaped area enclosed by the first heat exchange parts of multiple heat exchange units a rectangular frame area, the frame-shaped area enclosed by the first heat exchange parts of multiple heat exchange units can be similar in shape to the box body. This allows the overall outline shape of the heat exchange assembly to be similar to the shape of the box body, enabling the heat exchange assembly to make full use of the space inside the box body, thereby giving the heat exchange assembly a larger heat exchange area and improving the heat exchange capacity of the heat exchange assembly. In addition, by making the overall outline shape of the heat exchange assembly similar to the shape of the box body, the heat exchange between the heat exchange assembly and the battery cell assembly inside the box body can also be more uniform.

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

[0059] In the above technical solution, by setting the bending extension of the second heat exchange part to include a plurality of first heat exchange sections arranged along the first direction and a second heat exchange section connected between adjacent first heat exchange sections, the extension length of the second heat exchange part per unit area can be longer, thereby making the heat exchange area of ​​the second heat exchange part per unit area 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 the adjacent first heat exchange sections extend in an arc shape, the connection between the adjacent first heat exchange sections can be smoother, and the heat exchange medium flowing in the second heat exchange section can also be 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, the distance between two adjacent first heat exchange sections in the first direction is greater than the 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 bending process difficulty 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 the second heat exchange section.

[0064] In some embodiments, 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 to 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 bending process difficulty of the second heat exchange section can be reduced.

[0066] In some embodiments, there are two heat exchange units and two flow collectors. The first heat exchange portions of the two heat exchange units are connected through one of the flow collectors, and the second heat exchange portions of the two heat exchange units are connected through the other flow collector. The bent portions of the two heat exchange units are arranged along the first direction.

[0067] In the above technical solution, by setting two heat exchange units and two current collectors, the structure of the heat exchange assembly can be made simpler; and by arranging the bent parts of the two heat exchange units along the length of the housing, the space in the length direction of the housing can be fully utilized. 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 a first heat exchange unit and a second heat exchange unit, and the second heat exchange portion of the second heat exchange unit further 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 portion of the first heat exchange unit through the manifold.

[0069] In the above technical solution, by making the second heat exchange section 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, it is convenient to connect the bending part of the second heat exchange unit with the collector, and the space in the length direction of the box can be utilized by making at least a portion of the third heat exchange section extend along the length direction of the box.

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

[0071] In the above technical solution, by setting a connecting bracket and connecting the connecting bracket between the bending parts of the two heat exchange units, more connection positions can be provided between the multiple heat exchange units, and the bending 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 making the structure strength or rigidity of the entire heat exchange assembly higher, thus improving the structural stability of the entire heat exchange assembly. Because the structure strength or rigidity of the entire heat exchange assembly is higher, it is also convenient to install the heat exchange assembly into the battery device housing.

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

[0073] In the above technical solution, by making the extension lengths of multiple heat exchange units approximately the same, the heat exchange capacity of each heat exchange unit can be made comparable, the heat exchange can be made 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 setting multiple heat exchange units in parallel, the temperature of the heat exchange medium flowing in the heat exchange channel of each heat exchange unit can be more consistent, and the heat exchange effect of each heat exchange unit can be 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 vertical direction, and at least one side surface of the heat exchange unit in the thickness direction is in thermal contact or thermally connected to the battery cell assembly.

[0077] In the above technical solution, by setting 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 thermally contact or thermally connect with the battery cell assembly, the thermal 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 on which the heat exchange unit makes thermal contact or is thermally connected to 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 attached to the battery cell, increasing the heat conduction area between the heat exchange unit and the battery cell assembly, and improving the heat exchange efficiency of the heat exchange unit to the battery cell assembly.

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

[0081] In the above technical solution, by setting the battery cell assembly to include one or more battery cell rows arranged along a first direction and each battery cell row including multiple battery cells arranged along a second direction, the multiple battery cells in the battery cell assembly can be arranged in an orderly and compact manner, thereby increasing the capacity of the battery device; and by arranging the multiple battery cell assemblies along the length direction of the housing and arranging the multiple battery cells in each battery cell row along the width direction of the housing, the space inside the housing can be fully utilized, making the arrangement of multiple battery cells inside the housing more 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 multiple battery cells in a single battery cell row, the arrangement direction of multiple battery cells in the battery cell row intersects with at least a portion of the pipeline of the heat exchange unit. This allows each heat exchange unit to achieve thermally conductive contact with multiple battery cells in a single battery cell row, enabling a single heat exchange unit to exchange heat with multiple battery cells in the battery cell row. This improves heat exchange efficiency and makes the heat exchange of 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 vertical direction.

[0085] In the above technical solution, by arranging the heat exchange component on at least one side of the battery cell assembly along the vertical direction, the overall layout of the heat exchange component and the battery cell assembly can be made compact, which is also conducive to having a larger heat exchange contact area between the heat exchange component and the battery cell assembly, thereby improving the temperature regulation effect of the heat exchange component 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 the first projected area, and the sum of the projected areas of all the battery cells along the vertical direction is the second projected area, wherein 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 total projected area of ​​all heat exchange units along the vertical direction to the total projected area of ​​all battery cells along the vertical direction greater than 1 / 3, the heat conduction area between the heat exchange units and the battery cell assembly can be larger, resulting in higher heat exchange efficiency of the heat exchange assembly to the battery cell assembly.

[0088] In some embodiments, the heat exchange assembly is disposed within the housing.

[0089] In the above technical solution, by placing the heat exchange component inside the housing, the heat exchange component and the battery cell assembly can have better thermal contact, reducing the thermal resistance between the heat exchange component and the battery cell assembly and improving the heat exchange efficiency.

[0090] Secondly, this application provides an electrical device, including: a battery device according to the first aspect of this application.

[0091] In the above technical solution, by setting the battery device, the space occupied by the current collector of the battery device in the height direction is small, which can help to make effective use of the space inside the battery device, reduce the overall height of the battery device, thereby reducing the limitation of the installation and use scenarios of the battery device, and also help to improve the energy density of the battery device.

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

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

[0094] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0096] Figure 1 These are schematic diagrams of battery devices according to some embodiments of this application;

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

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

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

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

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

[0102] Figure 7 yes Figure 6 Enlarged view at point K;

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

[0104] Figure 9 This is a schematic diagram of a current collector in a battery device according to some embodiments of this application;

[0105] Figure 10 This is a schematic diagram of a connecting bracket in a battery device according to some embodiments of this application;

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

[0107] Figure 12 It is along Figure 11 A cross-sectional view of the GG line in the middle;

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

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

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

[0111] Figure label:

[0112] 1000. Electrical appliances;

[0113] 100. Battery device;

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

[0115] 20. Battery cell modules;

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

[0117] 50. Heat exchange components;

[0118] 5. Heat exchange unit; 51a. Heat exchange channel; 511a. Sub-channel; 5b. Flow divider; 51. First heat exchange section; 52. Second heat exchange section; 53. Bending section; 531. First heat exchange segment; 532. Second heat exchange segment; 533. Third heat exchange segment; 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. Manifold; 61. Liquid inlet; 62. Liquid outlet; 63. Liquid outlet chamber; 64. Manifold;

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

[0122] 200. Vehicle body. Detailed Implementation

[0123] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort 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 meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

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

[0126] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0127] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

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

[0129] In this application, "multiple" means two or more (including two).

[0130] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

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

[0132] In embodiments of this application, a battery apparatus may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple battery cells; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module may be formed by bundling multiple battery cells together with cable ties.

[0133] In this embodiment, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to this. The battery cell can be flat, cuboid, etc.

[0134] The battery device can be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. The individual battery cells can be battery modules, which can be housed within the housing by securing the battery modules to the housing; alternatively, multiple individual battery cells can be housed within the housing by directly securing them to the housing.

[0135] In embodiments of this application, the housing may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing for housing individual battery cells. Here, "closed" refers to covering or shutting down; it can 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, forming a closed space inside the housing for housing individual battery cells.

[0136] In embodiments of this application, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

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

[0138] Currently, judging from market trends, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand for them is also constantly increasing.

[0139] In related technologies, to ensure that the battery device operates within a suitable temperature range, heat exchange components are typically installed to exchange heat with the individual battery cells, thereby regulating the temperature of the individual cells. Introducing heat exchange components increases the overall size of the battery device. Therefore, after introducing heat exchange components to exchange heat with the individual battery cells, how to effectively utilize the internal space of the battery device to reduce its size has become a pressing technical problem to be solved.

[0140] Based on this, this application proposes a battery device, which includes: a housing, a battery cell assembly, and a heat exchange assembly. The battery cell assembly is disposed in the housing and includes multiple battery cells. The heat exchange assembly is used for heat exchange with the battery cell assembly and includes multiple heat exchange units and multiple current collectors. Each heat exchange unit is formed as a heat exchange tube and has a heat exchange flow channel. At least a portion of the heat exchange unit is bent and extended. Each heat exchange unit has two connecting ends in its extension direction. Each current collector has two current collection ports. The two connecting ends of each heat exchange unit are respectively connected to the current collection ports of different current collectors. Multiple current collectors connect multiple heat exchange units sequentially, and the multiple current collectors are arranged in a horizontal direction.

[0141] In the above technical solution, by setting the heat exchange components in the battery device to include multiple heat exchange units and multiple current collectors, the multiple heat exchange units are connected sequentially through multiple current collectors, and the heat exchange medium flowing in the multiple heat exchange units can be orderly introduced and drawn out through multiple current collectors. By optimizing the structure of the heat exchange components and setting multiple current collectors to be arranged in the horizontal direction, the horizontal space in the battery device can be fully utilized. This can reduce the vertical space occupied by the current collectors, which is conducive to the effective utilization of the space in the battery device, reducing the overall height of the battery device, and improving the energy density of the battery device.

[0142] The vehicle disclosed in this application can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device is installed inside the vehicle, and the battery device can be located at the bottom of the vehicle. The battery device can be used to power the vehicle, for example, it can serve as the vehicle's drive power source, replacing or partially replacing fuel or natural gas to provide driving power. The battery device can not only serve as the vehicle's drive power source but also as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery device to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs.

[0143] The following is for reference. Figures 1-14 A battery device 100 according to an embodiment of this application is described.

[0144] In the following description of this application, the width direction, the extension direction, 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 be referred to as the X direction in the drawings, the second direction can be referred to as the Y direction in the drawings, the up and down direction can be referred to as the Z direction in the 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 vertical direction of the battery device in normal use.

[0147] Reference Figures 1-5In a first aspect, embodiments of this application provide 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 within the housing 10 and includes a plurality of battery cells 301. The heat exchange assembly 50 is used for heat exchange with the battery cell assembly 20 and 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 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 its extension direction. Each current collector 6 has two current collection ports 64. The two connecting ends 55 of each heat exchange unit 5 are respectively connected to the current collection ports 64 of different current collectors 6. The plurality of current collectors 6 connect the plurality of heat exchange units 5 sequentially and are arranged in a horizontal direction.

[0148] The heat exchange component 50 is used for heat exchange with the battery cell assembly 20. This can be understood as follows: there is a thermally conductive relationship between the heat exchange component 50 and the battery cell assembly 20, such as thermally conductive contact or connection, to achieve heat exchange between the heat exchange component 50 and the battery cell assembly 20. The heat exchange component 50 can be used to increase or decrease the temperature of the battery cell 301, depending on the ambient temperature of the battery device 100 and its own temperature.

[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. During the flow of the heat exchange medium along the heat exchange channel 51a of the heat exchange unit 5, the heat exchange medium can carry away the heat generated by the battery cell 301 or heat the battery cell 301.

[0150] Each heat exchange unit 5 is formed as a heat exchange tube, which allows for a more flexible arrangement of the heat exchange units 5. For example, the flow path or flow direction of the heat exchange channel 51a in the heat exchange unit 5 can be bent as needed. 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 heat exchange unit 5 is bent and extended in at least part, which can be either a partial bending and extension of the heat exchange unit 5 or a complete bending and extension of the heat exchange unit 5. This increases 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] Partial manifold 6 can be used to introduce heat exchange medium into the heat exchange channel 51a of heat exchange unit 5, and partial manifold 6 can be used to draw out the heat exchange medium flowing through heat exchange unit 5. For example, partial manifold 6 has an inlet chamber and another partial manifold 6 has an outlet chamber 63. The heat exchange medium can flow into the inlet chamber of partial manifold 6, the heat exchange medium entering the inlet chamber flows into multiple heat exchange units 5, and the heat exchange medium flowing through multiple heat exchange units 5 flows into the outlet chamber 63 of another partial manifold 6.

[0153] Multiple manifolds 6 connect multiple heat exchange units 5 sequentially. The number of manifolds 6 can be the same as the number of heat exchange units 5. In the direction in which the multiple heat exchange units 5 are connected sequentially, two adjacent heat exchange units 5 can be connected through one manifold 6. The two ends of the extension direction of each heat exchange unit 5 are connection ends 55. The connection ends 55 of each heat exchange unit 5 are connected to the manifolds 6. For example, one connection end 55 of each heat exchange unit 5 is connected to the manifold 6 with a liquid inlet chamber, and the other connection end 55 of each heat exchange unit 5 is connected to the manifold 6 with a liquid outlet chamber 63.

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

[0155] The arrangement of multiple current collectors 6 in the horizontal direction can include the following situations: multiple current collectors 6 can be arranged in a row or column according to a set direction, multiple current collectors 6 can also be arranged in a staggered manner, or multiple current collectors 6 can also be arranged in an irregular form.

[0156] The arrangement of multiple current collectors 6 in the horizontal direction, compared to the arrangement of multiple current collectors 6 in the vertical direction, can reduce the vertical space occupied by multiple current collectors 6, which can help to effectively utilize the internal space of the battery device 100 and reduce the overall height of the battery device 100.

[0157] Furthermore, configuring the heat exchange assembly 50 as multiple separate manifolds 6 reduces the structural complexity of the manifolds 6, thus lowering the manufacturing difficulty, compared to integrating multiple manifolds 6 into a single manifold module (which requires considering and configuring sealing and isolation between different cavities within the module, resulting in a complex structure and challenging manufacturing process). Moreover, configuring the heat exchange assembly 50 as multiple separate manifolds 6, compared to integrating multiple manifolds 6 into a single module, also reduces or avoids mutual interference between the manifolds 6. For example, it reduces or avoids the influence between the manifold 6 with the liquid inlet chamber and the manifold 6 with the liquid outlet chamber 63, and it avoids or reduces temperature transfer between the manifold 6 with the liquid inlet chamber and the manifold 6 with the liquid outlet chamber 63, which could affect the heat exchange efficiency of the heat exchange medium (as there is a significant temperature difference between the heat exchange medium in the liquid inlet chamber and the heat exchange medium in the liquid outlet chamber 63).

[0158] Furthermore, by configuring the current collection module of the heat exchange component 50 as multiple separate current collection elements 6, compared to integrating multiple current collection elements 6 into a single current collection module, the size of a single current collection element 6 relative to the entire current collection module can be reduced. For example, the size of a single current collection element 6 in the height direction can be reduced, allowing it to be made thinner and achieving a flattened design, thus reducing the space occupied by a single current collection element 6 in the height direction. Simultaneously, since the multiple current collection elements 6 are arranged horizontally, the space occupied by the multiple current collection elements 6 in the height direction is not significantly increased compared to the space occupied by a single current collection element 6 in the height direction. This reduces the space occupied by the current collection elements 6 of the heat exchange component 50 in the height direction, which is beneficial for the effective utilization of the internal space of the battery device 100 and helps to reduce the overall height of the battery device 100.

[0159] In the above technical solution, by setting the heat exchange component 50 in the battery device 100 to include multiple heat exchange units 5 and multiple current collectors 6, the multiple heat exchange units 5 are connected sequentially through multiple current collectors 6, and the heat exchange medium flowing in the multiple heat exchange units 5 can be orderly introduced and drawn out through multiple current collectors 6. By optimizing the structure of the heat exchange component and setting multiple current collectors 6 to be arranged in the horizontal direction, the horizontal space in the battery device 100 can be fully utilized. This can reduce the vertical space occupied by the current collectors 6, which is conducive to the effective utilization of the space in the battery device 100, reducing the overall height of the battery device 100, and improving the energy density of the battery device 100.

[0160] In some embodiments, the height difference between any two current collectors 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 collectors 6 in the vertical direction represents the distance between their center positions in the vertical direction. Alternatively, in other embodiments, the height difference between the two collectors 6 in the vertical direction can be the distance between their upper surfaces. This height difference can be represented by the distance between the same position of the collectors 6 in the vertical direction.

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

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

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

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

[0166] For example, the difference in thickness between any two current collectors 6 in the vertical direction can be 2mm, 1.8mm, 1.5mm, 1.2mm, 1.0mm, 0.8mm, 0.5mm, 0.2mm, 0mm, etc.

[0167] The difference in thickness between any two current collectors 6 in the vertical direction can be understood as the absolute value of the difference in thickness between any two current collectors 6 in the vertical direction.

[0168] In the above technical solution, by designing the dimensional relationship of multiple current collectors 6 in the height direction, the difference in thickness of any two current collectors 6 in the height direction is less than or equal to 2mm. This makes the thickness of multiple current collectors 6 in the height direction less different or roughly the same, thereby better reducing the space occupied by multiple current collectors 6 in the height direction and making it more conducive to reducing the overall height of the battery device 100.

[0169] In some embodiments, refer to Figure 13 The thickness of a single current collector 6 in the vertical direction is i, where i is less than or equal to 14 mm.

[0170] In the above technical solution, by designing the thickness of a single current collector 6 in the height direction to be less than or equal to 14mm, the single current collector 6 occupies less space in the height direction. At the same time, multiple current collectors 6 are arranged horizontally. While making full use of the horizontal space within the battery device 100, the space occupied by multiple current collectors 6 in the height direction can be effectively reduced. For example, the space occupied by multiple current collectors 6 in the height direction can be about 14mm, which is more conducive to reducing the overall height of the battery device 100.

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

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

[0173] In the above technical solution, based on limiting the thickness of a single current collector 6 in the height direction to less than or equal to 14mm, the thickness of a single current collector 6 in the height direction is further set to a range of 8mm to 13mm. While making the thickness of a single current collector 6 in the height direction smaller to reduce the space occupied by multiple current collectors 6 in the height direction, it can also ensure that the wall thickness and internal cavity size of a single current collector 6 meet the design requirements. For example, it can avoid the situation where the structural strength of the current collector 6 is low and the internal cavity size is small due to the small thickness of a single current collector 6 in the height direction, thus failing to meet the design requirements.

[0174] In some embodiments, each manifold 6 has the same specifications.

[0175] In the above technical solution, by making each manifold 6 identical, the number of specifications of the manifold 6 can be reduced, the number of mold types for manufacturing the manifold 6 can be reduced, and the cost can be reduced.

[0176] In some embodiments, refer to Figure 13 The ratio of the thickness dimension i of a single manifold 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 of a single current collector 6 in the height direction and the thickness of a single heat exchange unit 5 in the height direction, the ratio of the thickness of a single current collector 6 in the height direction to the thickness of a single heat exchange unit 5 in the height direction is made less than 1.8. This makes the thickness of a single current collector 6 in the height direction smaller, thus reducing the space occupied by a single current collector 6 in the height direction. At the same time, multiple current collectors 6 are arranged in the horizontal direction, which makes full use of the horizontal space within the battery device 100 while effectively reducing the space occupied by multiple current collectors 6 in the height direction, and is more conducive to reducing the overall height of the battery device 100.

[0178] In some embodiments, the ratio of the thickness dimension of a single manifold 6 in the vertical direction to the thickness dimension of a single heat exchange unit 5 in the vertical direction ranges from 1.2 to 1.7.

[0179] For example, the ratio of the thickness of a single manifold 6 in the vertical direction to the thickness of a single heat exchange unit 5 in the vertical direction can be 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, etc.

[0180] In the above technical solution, based on limiting the ratio of the thickness of a single manifold 6 in the height direction to the thickness of a single heat exchange unit 5 in the height direction to be less than 1.8, the ratio of the thickness of a single manifold 6 in the height direction to the thickness of a single heat exchange unit 5 in the height direction is further limited to a range of 1.2 to 1.7. This makes the thickness of a single manifold 6 in the height direction smaller, thereby reducing the space occupied by multiple manifolds 6 in the height direction, while also ensuring that the wall thickness and internal cavity size of a single manifold 6 meet the design requirements. For example, it can avoid the situation where the structural strength of the manifold 6 is low and the internal cavity size is small due to the small thickness of a single manifold 6 in the height direction, thus failing to meet the design requirements.

[0181] In some embodiments, refer to Figures 6-9 The two collection ports 64 of a single collector 6 are located on opposite sides of the collector 6.

[0182] In the above technical solution, by designing the positions of the two collection ports 64 of a single collector 6, the two collection ports 64 of the single collector 6 are located on opposite sides of the collector 6. When two heat exchange units 5 of the multiple heat exchange units 5 are respectively connected to the two collection ports 64 of the single collector 6, the two heat exchange units 5 can be connected to the collection ports 64 of the collector 6 from opposite sides of the collector 6, which can reduce the increased connection process difficulty caused by interference when two heat exchange units 5 are connected to the same collector 6. This reduces the difficulty of connecting two heat exchange units 5 to the same collector 6, making the connection operation of two heat exchange units 5 to the same collector 6 more convenient.

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

[0184] In the above technical solution, by inserting the connection end 55 of the heat exchange unit 5 into the collection port 64, it is convenient to connect the heat exchange unit 5 and the collection element 6, and the connection area between the heat exchange unit 5 and the collection element 6 can be increased, making the connection between the two more stable.

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

[0186] In the above technical solution, by welding the connection end 55 of the heat exchange unit 5 to the collector 6, the connection between the heat exchange unit 5 and the collector 6 can be made reliable. In addition, since the thickness of both the heat exchange unit 5 and the collector 6 is small, welding the heat exchange unit 5 and the collector 6 together makes the connection operation more convenient. Moreover, compared with fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set connection holes for fastener connection.

[0187] In some embodiments, refer to Figure 6 At least some of the manifolds are spaced apart.

[0188] Among them, at least some of the current collectors 6 are spaced apart, which may include the following situations: some current collectors 6 are spaced apart, or all current collectors 6 are spaced apart.

[0189] In the above technical solution, by making at least some of the current collectors 6 spaced apart, the mutual influence between the multiple current collectors 6 can be reduced. While arranging the multiple current collectors 6 in the horizontal direction, the horizontal space within the battery device 100 is fully utilized, so that the current collectors 6 can make more flexible use of the horizontal space within the battery device.

[0190] In some embodiments, refer to Figure 6At least some of the current collectors 6 are arranged along the first direction, which is the length direction of the housing 10.

[0191] Wherein, at least some of the current collectors 6 are arranged along the first direction, which may include the following situations: some current collectors 6 are arranged along the first direction, or all current collectors 6 are arranged along the first direction.

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

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

[0194] In some embodiments, refer to Figure 6 Along the first direction, at least two collectors 6 are at least partially offset in the second direction, which is the width direction of the housing 10.

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

[0196] At least two current collectors 6 are at least partially offset in the second direction, which may include the following situations: two current collectors 6 are partially offset in the second direction; or, two current collectors 6 are completely offset in the second direction; or, any two current collectors 6 are partially offset in the second direction; or, any two current collectors 6 are completely offset in the second direction; or, some current collectors 6 are partially offset in the second direction, and some current collectors 6 are completely offset in the second direction.

[0197] In the above technical solution, along the length of the housing 10, the positions of at least two current collectors 6 are at least partially staggered in the width direction of the housing 10. This makes full use of the space in the width direction of the housing 10, further improving the effective utilization of the internal space of the housing 10 by the multiple current collectors 6, which is more conducive to improving the energy density of the battery device 100, and also makes the layout of the multiple current collectors 6 more flexible. Furthermore, by making the positions of at least two current collectors 6 at least partially staggered in the width direction of the housing 10, it is convenient for the multiple current collectors 6 to be connected to multiple external pipes respectively, reducing the interference and layout difficulties of external pipes connected to different current collectors 6. For example, since the positions of at least two current collectors 6 are at least partially staggered in the width direction of the housing 10, at least some of the multiple external pipes connected to the multiple current collectors 6 can also be arranged roughly along the width direction of the housing 10, making better use of the space in the width direction of the housing 10, and reducing the occupation of the internal height space of the battery device 100 by the multiple external pipes connected to the multiple current collectors 6, which is conducive to reducing the overall height of the battery device 100.

[0198] In some embodiments, refer to Figure 11 At least some of the manifolds 6 have a liquid inlet chamber and a liquid inlet 61 communicating with the liquid inlet chamber, and at least some of the manifolds 6 have a liquid outlet chamber 63 and a liquid outlet 62 communicating with the liquid outlet chamber 63; wherein, the liquid inlets 61 or liquid outlets 62 of two adjacent manifolds 6 in the first direction are staggered in the second direction, and the second direction is the width direction of the housing 10.

[0199] The inlet 61 or outlet 62 of two adjacent manifolds 6 in the first direction are staggered in the second direction, including the following situations: for example, both adjacent manifolds 6 have inlet 61, and the inlet 61 of the two adjacent manifolds 6 are staggered in the second direction; for example, both adjacent manifolds 6 have outlet 62, and the outlet 62 of the two adjacent manifolds 6 are staggered in the second direction; for example, one of the two adjacent manifolds 6 has an inlet 61 and the other of the two adjacent manifolds 6 has an outlet 62, and the inlet 61 and outlet 62 of the two adjacent manifolds 6 are staggered in the second direction.

[0200] In the above technical solution, by staggering the positions of the inlet 61 or outlet 62 of two adjacent manifolds 6 in the second direction, it is convenient for the inlet 61 or outlet 62 of multiple manifolds 6 to be connected to multiple external pipes respectively, reducing the interference and layout problems of external pipes connected to different manifolds 6. For example, since at least two manifolds 6 are at least partially staggered in the width direction of the housing 10, at least part of the multiple external pipes connected to multiple manifolds 6 can also be arranged roughly along the width direction of the housing 10, making better use of the width direction space of the housing 10, and reducing the occupation of the height space inside the battery device 100 by the multiple external pipes connected to multiple manifolds 6, which is conducive to reducing the overall height of the battery device 100.

[0201] In some embodiments, refer to Figures 6-8 The two collection ports 64 of a single collection element 6 are located on opposite sides of the collection element 6 along the second direction, which is the width direction of the housing 10.

[0202] In the above technical solution, by designing the positions of the two collection ports 64 of a single current collector 6, the two collection ports 64 of the single current collector 6 are located on opposite sides of the current collector 6 along the width direction of the housing 10. When two heat exchange units 5 of the multiple heat exchange units 5 are respectively connected to the two collection ports 64 of the single current collector 6, the two heat exchange units 5 can be connected to the collection ports 64 of the current collector 6 from opposite sides of the current collector 6, which can reduce the increased connection process difficulty caused by interference when two heat exchange units 5 are connected to the same current collector 6. This reduces the difficulty of connecting two heat exchange units 5 to the same current collector 6, making the connection operation of two heat exchange units 5 to the same current collector 6 more convenient. In addition, by placing the two collection ports 64 of the single current collector 6 on opposite sides of the current collector 6 along the width direction of the housing 10, the space in the width direction of the housing 10 can be fully utilized, making the overall structural layout of the battery device 100 more compact.

[0203] In some embodiments, refer to Figure 5 and Figure 6 Multiple manifolds 6 are located at the same end of the heat exchange assembly 50 along a first direction, which is the length direction of the housing 10.

[0204] In the above technical solution, by arranging multiple current collectors 6 at the same end of the heat exchange assembly 50 along the length of the housing 10, and connecting multiple current collectors 6 to multiple external pipes respectively, the multiple connection positions of the heat exchange assembly 50 and the external pipes are arranged at the same end of the heat exchange assembly 50, which facilitates the connection between the heat exchange assembly 50 and the external pipes. 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 for the heat exchange assembly 50 of the battery device 100 to be connected to the external pipes on the vehicle body 200.

[0205] In some embodiments, refer to Figure 6 Multiple heat exchange units 5 are connected end to end in a ring structure through multiple manifolds 6.

[0206] Among them, multiple heat exchange units 5 are connected end to end to form a ring structure through multiple flow collectors 6. The multiple heat exchange units 5 are straightened and unfolded, and the ring structure formed by the multiple heat exchange units 5 connected end to end through multiple flow collectors 6 can present a ring shape in appearance.

[0207] In the above technical solution, multiple heat exchange units 5 are connected end to end to form a ring structure through multiple manifolds 6, which makes the connection operation of multiple heat exchange units 5 and multiple manifolds 6 relatively simple and the structure formed by the connection is also relatively simple.

[0208] In some embodiments, at least a portion of the manifold 6 has a liquid inlet chamber and a liquid inlet 61 communicating with the liquid inlet chamber, at least a portion of the manifold 6 has a liquid outlet chamber 63 and a liquid outlet 62 communicating with the liquid outlet chamber 63, one of the two connection ends 55 of each heat exchange unit 5 is communicating with the liquid inlet chamber through the manifold 64, and the other of the two connection ends 55 of each heat exchange unit 5 is communicating with the liquid outlet chamber 63 through the manifold 64.

[0209] In the above technical solution, by connecting the two connection ends 55 of each heat exchange unit 5 to different collectors 6 respectively, and connecting the two connection ends 55 of each heat exchange unit 5 to the inlet chamber and outlet chamber 63 of different collectors 6 respectively, the heat exchange medium flowing into the inlet chamber of one collector 6 can flow into the heat exchange unit 5. After flowing through the heat exchange unit 5, the heat exchange medium flows into the outlet chamber 63 of another collector 6, thereby realizing the flow circulation of the heat exchange medium in the heat exchange unit 5. This allows multiple heat exchange units 5 to be set up in parallel, so that the temperature of the heat exchange medium flowing in multiple heat exchange units 5 is close, thereby making the temperature regulation of the battery cell assembly 20 more uniform by multiple heat exchange units 5. In addition, by forming the inlet chamber and outlet chamber 63 on different manifolds 6, the mutual influence between the heat exchange medium in the inlet chamber and the heat exchange medium in the outlet chamber 63 can be reduced. For example, the heat exchange between the heat exchange medium in the inlet chamber and the heat exchange medium in the outlet chamber 63 can be reduced or avoided, thus affecting the temperature regulation efficiency of the heat exchange medium for the battery cell 301.

[0210] In some embodiments, refer to Figures 6-8 There are two heat exchange units 5 and two flow collectors 6. One flow collector 6 has a liquid inlet chamber and a liquid inlet 61 connected to the liquid inlet chamber, and the other flow collector 6 has a liquid outlet chamber 63 and a liquid outlet 62 connected to the liquid outlet chamber 63.

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

[0212] In some embodiments, refer to Figures 6-8 The heat exchange assembly 50 includes a connecting bracket 7, and at least two heat exchange units 5 are connected by the connecting bracket 7.

[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 setting the connecting bracket 7, at least two heat exchange units 5 are connected by the connecting bracket 7, which can provide more connection positions between multiple heat exchange units 5, thereby improving the stability of the connection between multiple heat exchange units 5, and also making the structural strength or rigidity of the entire heat exchange assembly 50 higher, thus improving the structural stability of the entire heat exchange assembly 50. Since the structural strength or rigidity of the entire heat exchange assembly 50 is higher, it is also convenient to install the heat exchange assembly 50 into the housing 10 of the battery device 100.

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

[0216] In the above technical solution, the thickness of the heat exchange unit 5 and the size of the connecting bracket 7 are both 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. Moreover, compared with fastener connection, it also avoids the risk of heat exchange medium leakage caused by the need to set connection holes for fastener connection.

[0217] In some embodiments, refer to Figures 6-8 At least a portion of the connecting bracket 7 is located within 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, reducing the additional space occupied by the connecting bracket 7. For example, it can reduce the space occupied in the height direction within the battery device 100, thereby helping to reduce the overall height 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, by placing at least a portion of the connecting bracket 7 within the gap 503 between the corresponding two heat exchange units 5, and simultaneously ensuring that the dimension of the connecting bracket 7 in the height direction is less than or equal to the thickness dimension of the heat exchange unit 5 in the height direction, the entire connecting bracket 7 can be located within the gap 503 of the heat exchange unit 5 bracket. This allows for more efficient use of the gap 503 between the heat exchange units 5 and reduces the additional space occupied by the connecting bracket 7. For example, it can reduce the space occupied in the height direction within the battery device 100, thereby helping to reduce the overall height dimension of the battery device 100.

[0221] In some embodiments, refer to Figure 5 In the vertical 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 can form the heat exchange surface 54.

[0223] For example, when the heat exchange assembly 50 is located below the battery cell assembly 20, the first surface 56 is the upper surface of the heat exchange unit 5, and the 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, sufficient contact can be achieved between the surface of the heat exchange unit 5 facing the battery cell assembly 20 and the battery cell assembly 20, 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 situation where the gap 503 between the heat exchange unit 5 and the battery cell assembly 20 is too large 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, thus preventing sufficient contact heat exchange.

[0225] In some embodiments, refer to 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 side flanges connected to opposite sides of the bracket plate 71, it is convenient for the connecting bracket 7 to be connected to the heat exchange unit 5 through the side flanges 72, and the structure of the connecting bracket 7 is relatively simple and easy to process and manufacture.

[0227] In some embodiments, refer to Figure 11 The heat exchange unit 5 includes a first heat exchange section 51 and a second heat exchange section 52. The first heat exchange sections 51 of the multiple heat exchange units 5 together enclose a frame-shaped area. The second heat exchange sections 52 of the multiple heat exchange units 5 are all located within the frame-shaped area, and the second heat exchange sections 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 part 52 of the multiple heat exchange units 5 located in the frame-shaped area enclosed by the first heat exchange part 51, and making the second heat exchange part 52 bend and extend, the multiple heat exchange units 5 can be arranged compactly, which can increase the arrangement density of the heat exchange assembly 50 per unit area, thereby improving the heat exchange capacity of the heat exchange assembly 50 per unit area and improving the heat exchange efficiency of the heat exchange assembly 50 for the battery cell assembly 20.

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

[0230] In the above technical solution, by making the frame-shaped area enclosed by the first heat exchange parts 51 of the multiple heat exchange units 5 a rectangular frame area, the frame-shaped area enclosed by the first heat exchange parts 51 of the multiple heat exchange units 5 can be similar in shape to the box 10. This allows the overall outline shape of the heat exchange assembly 50 to be similar to the shape of the box 10, enabling the heat exchange assembly 50 to make full use of the space inside the box 10, thereby giving the heat exchange assembly 50 a larger heat exchange area and improving the heat exchange capacity of the heat exchange assembly 50. In addition, by making the overall outline shape of the heat exchange assembly 50 similar to the shape of the box 10, the heat exchange between the heat exchange assembly 50 and the battery cell assembly 20 inside the box 10 can also be more uniform.

[0231] In some embodiments, refer to Figure 11 The second heat exchange section 52 includes a bending section 53, which 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 a first direction and each first heat exchange section 531 extends along a second direction. The second heat exchange section 532 is connected between the same end of two adjacent first heat exchange sections 531 along the second direction.

[0232] In the above technical solution, by setting the bending extension of the second heat exchange section 52 to include a plurality of first heat exchange sections 531 arranged along the first direction and second heat exchange sections 532 connected between adjacent first heat exchange sections 531, the extension length of the second heat exchange section 52 per unit area can be longer, thereby making the heat exchange area of ​​the second heat exchange section 52 per unit area 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, refer to 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 smoother, and the heat exchange medium flowing in the second heat exchange section 532 can also be smoother, reducing the flow resistance of the heat exchange medium between 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, refer to 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 bending process difficulty of the second heat exchange section 52 can be reduced during 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, refer to Figure 11 The ratio of the extension length L of the first heat exchange section 531 to the extension length of the second heat exchange section 532 is 0.7 to 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 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 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 bending process difficulty of the second heat exchange section 52 can be reduced.

[0240] In some embodiments, refer to Figure 11 There are two heat exchange units 5 and two flow collectors 6. The first heat exchange part 51 of the two heat exchange units 5 is connected through one of the flow collectors 6, and the second heat exchange part 52 of the two heat exchange units 5 is connected through the other flow collector 6. The bent parts 53 of the two heat exchange units 5 are arranged along the first direction.

[0241] In the above technical solution, by setting two heat exchange units 5 and two current collectors 6, the structure of the heat exchange assembly 50 can be made simpler; and by arranging the bent portions 53 of the two heat exchange units 5 along the length direction of the housing 10, the length direction space of the housing 10 can be fully utilized. 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, refer to Figure 11 The two heat exchange units 5 are a first heat exchange unit 501 and a second heat exchange unit 502, respectively. The second heat exchange section 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 a first direction. One end of the third heat exchange section 533 is connected to the bent portion 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 section 52 of the first heat exchange unit 501 through a collector 6.

[0243] In the above technical solution, by making the second heat exchange section 52 of the second heat exchange unit 502 include a third heat exchange section 533, and making at least a portion of the third heat exchange section 533 extend along the length direction of the housing 10, it is convenient to connect the bending portion 53 of the second heat exchange unit 502 with the collector 6, and the space in the length direction of the housing 10 can be utilized by making at least a portion of the third heat exchange section 533 extend along the length direction of the housing 10.

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

[0245] In the above technical solution, by setting the connecting bracket 7 and connecting the connecting bracket 7 between the bending portions 53 of the two heat exchange units 5, more connection positions can be provided between the multiple heat exchange units 5, and the bending portions 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 assembly 50 higher, thus improving the structural stability of the entire heat exchange assembly 50. Since the structural strength or rigidity of the entire heat exchange assembly 50 is higher, it is also convenient to install the heat exchange assembly 50 into the housing 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 to 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, etc.

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

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

[0250] For example, the heat exchange medium can flow into the inlet chamber of a portion of the manifold 6, and the heat exchange medium entering the inlet chamber flows into the heat exchange channels 51a of multiple heat exchange units 5. The heat exchange medium flowing through multiple heat exchange units 5 converges into the outlet chamber 63 of another portion of the manifold 6, thereby realizing the circulation of the heat exchange medium in multiple heat exchange units 5. It can also realize the simultaneous flow of the heat exchange medium through multiple heat exchange units 5, reducing the temperature difference of the heat exchange medium between heat exchange units 5, and making the temperature of multiple heat exchange units 5 approximately the same.

[0251] For example, there can be two heat exchange units 5, which are arranged in parallel. There are two manifolds 6, one of which has an inlet chamber and the other has an outlet chamber 63. Each heat exchange unit 5 has two connection ends 55 at both ends. The two connection ends 55 of each heat exchange unit 5 are connected to the two manifolds 6 respectively, so that the two heat exchange units 5 can be arranged in parallel.

[0252] In the above technical solution, by setting multiple 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 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 vertical direction, and at least one side surface of the heat exchange unit 5 in the thickness direction is in thermal contact or thermally connected 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, or the heat exchange unit 5 can be in direct contact with the battery cell assembly 20.

[0256] The heat exchange unit 5 is thermally connected to the battery cell assembly 20. This thermal connection can be achieved through a thermally conductive structure, such as a thermally conductive adhesive layer.

[0257] In the above technical solution, by setting 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 thermally contact or thermally connect with the battery cell assembly 20, the thermally conductive 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, refer to Figures 3-6 The surface of the heat exchange unit 5 that is in thermal contact or thermally connected with the battery cell assembly 20 is the heat exchange surface 54, which is a plane.

[0259] At least one side 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 thermally connected to 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 attached to the battery cell 301, 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 to the battery cell assembly 20.

[0261] In some embodiments, refer to Figures 11-14 The heat exchange unit 5 has one or more flow dividers 5b spaced apart along the width direction of the heat exchange channel 51a. The flow dividers 5b extend along the extension direction of the heat exchange channel 51a.

[0262] Among them, the flow divider 5b can be integrally formed with the heat exchange channel 51a.

[0263] In the above technical solution, by providing a flow divider 5b extending along the extension direction of 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 it can also improve the structural strength of the heat exchange channel 51a.

[0264] In some embodiments, refer to Figure 14 The flow divider 5b divides the heat exchange channel 51a into multiple sub-channels 511a arranged side by side and separated from each other. The multiple sub-channels 511a are arranged along the width direction of the heat exchange channel 51a.

[0265] In the above technical solution, by dividing the heat exchange channel 51a into multiple sub-channels 511a arranged side by side and separated from each other by the flow divider 5b provided in the heat exchange channel 51a, the heat exchange medium in the heat exchange channel 51a can flow along multiple sub-channels 511a with smaller flow areas, which can further improve the heat exchange effect between the heat exchange channel 51a and the battery cell assembly 20; and further improve the structural strength of the heat exchange channel 51a.

[0266] In some embodiments, refer to 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 flow divider 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 to 1.2.

[0267] For example, the ratio of the thickness of the flow divider 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 setting 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 making the ratio of the thickness of the flow divider 5b in the width direction of the heat exchange channel 51a to the wall thickness of the heat exchange flat tube 0.7 to 1.2, the flow divider 5b can have higher structural strength, and the flow divider 5b can occupy less space in the heat exchange channel 51a.

[0269] In some embodiments, refer to Figures 3-5 The battery cell assembly 20 includes one or more battery cell rows 30 arranged along a first direction, and 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 housing 10, and the second direction is the width direction of the housing 10.

[0270] When there are multiple battery cell modules 20, the multiple battery cell modules 20 can 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 a first direction and each battery cell row 30 including multiple battery cells 301 arranged along a second direction, the multiple battery cell rows 30 in the battery cell assembly 20 can be ordered and compact, thereby increasing the capacity of the battery device 100; and by arranging the multiple battery cell assemblies 20 along the length direction of the housing 10 and arranging the multiple battery cells 301 in each battery cell row 30 along the width direction of the housing 10, the space inside the housing 10 can be fully utilized, making the arrangement of the multiple battery cells 301 inside the housing 10 more compact, which is beneficial to improving the energy density of the battery device 100.

[0272] In some embodiments, refer to Figures 3-6 At least a portion of the heat exchange unit 5 extends along the second direction.

[0273] At least a portion of the heat exchange unit 5 extends along the second direction. For example, a portion of the heat exchange unit 5 may extend along the second direction. For instance, when the heat exchange unit 5 includes the first heat exchange section 531 described above, 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 plurality of battery cells 301 in the single battery cell row 30, the arrangement direction of the plurality of battery cells 301 in the battery cell row 30 intersects with at least a portion of the pipeline of the heat exchange unit 5. This allows each heat exchange unit 5 to achieve thermally conductive contact with the plurality of battery cells 301 in the single battery cell row 30, enabling the single heat exchange unit 5 to exchange heat with the plurality of battery cells 301 in the battery cell row 30. This improves heat exchange efficiency and makes the heat exchange of the plurality of battery cells 301 in the battery cell row 30 more uniform.

[0275] In some embodiments, refer to Figures 3-5 The heat exchange component 50 is arranged on at least one side of the battery cell assembly 20 in the vertical direction.

[0276] For example, the heat exchange component 50 can be placed on one side of the battery cell assembly 20 along the vertical direction, such as on the lower side of the battery cell assembly 20; the heat exchange component 50 can also be arranged on both sides of the battery cell assembly 20 along the vertical direction.

[0277] In the above technical solution, by arranging the heat exchange component 50 on at least one side of the battery cell assembly 20 in the vertical direction, the overall layout of the heat exchange component 50 and the battery cell assembly 20 can be made compact. It is also beneficial to make the heat exchange component 50 and the battery cell assembly 20 have a larger heat exchange contact area, thereby improving the temperature regulation effect of the heat exchange component 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, and the sum of the projected areas of all battery cells 301 along the vertical direction is the second projected area. 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 total projected area of ​​all heat exchange units 5 in the vertical direction to the total projected area of ​​all battery cells 301 in the vertical direction greater than 1 / 3, the heat conduction area between the heat exchange unit 5 and the battery cell assembly 20 can be larger, resulting in higher heat exchange efficiency of the heat exchange assembly 50 for the battery cell assembly 20.

[0281] In some embodiments, refer to Figures 1-4 The heat exchange component 50 is located inside the housing 10.

[0282] In the above technical solution, by placing the heat exchange component 50 inside the housing 10, the heat exchange component 50 and the battery cell assembly 20 can have better thermal contact, reducing the thermal resistance between the heat exchange component 50 and the battery cell assembly 20 and improving the heat exchange efficiency.

[0283] In some embodiments, refer to Figures 2-3 The inner wall of the housing 10 has a receiving groove 112, the shape of which is adapted to 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 receiving tank 112 is adapted to the shape of the heat exchange unit 5, including: the extension trajectory of the receiving tank 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 housing 10, the installation and positioning of the heat exchange unit is facilitated.

[0286] In some embodiments, refer to Figures 2-3 The inner wall of the box 10 has multiple ribs 111, which work together to define the receiving groove 112.

[0287] In the above technical solution, by forming multiple ribs 111 on the inner wall of the box 10 and defining the receiving groove 112 by the cooperation of the multiple ribs 111, the forming process of the receiving groove 112 is more convenient, and the multiple ribs 111 can improve the structural strength of the box 10.

[0288] In some embodiments, refer to Figures 2-3 Part of the box body 10 protrudes inward to form multiple ribs 111.

[0289] In the above technical solution, by making a portion of the box 10 protrude inward to form a plurality of ribs 111, the processing of the ribs 111 is facilitated, and the structural strength of the box 10 is improved by the plurality of ribs 111 without increasing the weight of the box 10.

[0290] In some embodiments, refer to Figures 2-3 The housing 10 includes a base plate 11, and the heat exchange assembly 50 is mounted on the base plate 11.

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

[0292] The bottom plate 11 of the housing 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 housing 10, the heat exchange component 50 is located at a lower position inside the housing 10, which facilitates the installation and fixing of the heat exchange component 50 and makes the center of gravity of the battery device 100 lower, making it more stable and reliable.

[0294] In some embodiments, refer to Figures 2-3 The base plate 11 is provided with mounting beams 12, which are arranged on opposite sides of the heat exchange assembly 50 along the second direction and extend along the first direction. The battery cell assembly 20 is connected to the mounting beams 12, and the second direction intersects with the first direction.

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

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

[0297] For example, the ratio of the dimension of the housing 10 in the first direction to the dimension of the housing 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 housing 10 of the battery device 100 in the first direction significantly larger than the size of the housing 10 in the second direction, the battery device 100 can be made to be roughly rectangular in shape. When the battery device 100 is applied to a vehicle, the housing 10 can be placed along the longitudinal direction of the vehicle in the first direction, which can make full use of the longitudinal space of the vehicle and is conducive to improving the battery capacity of the battery device 100.

[0299] In some embodiments, the ratio of the dimension of the housing 10 in the vertical direction to the dimension of the housing 10 in the second direction is less than 0.3, where the second direction is the width direction of the housing 10.

[0300] In the above technical solution, by making the dimensions of the housing 10 smaller in the vertical direction, the battery device 100 can be made to be flat overall. When the battery device 100 is used in a vehicle, it can reduce the space occupied by the battery device 100 in the Z-direction of the vehicle, 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 less space in the Z-direction, the bottom height of the battery device 100 will not be too low, thus reducing the risk of the battery device 100 being scratched or damaged during vehicle operation.

[0301] Secondly, referring to Figure 15This application provides an electrical device 1000, including: a battery device 100 according to the first aspect of this application.

[0302] In the above technical solution, by setting the battery device 100, the space occupied by the current collector 6 of the battery device 100 in the height direction is smaller, which can help to make effective use of the internal space of the battery device 100, reduce the overall height of the battery device 100, thereby reducing the limitation of the installation and use scenarios of the battery device 100, and helping to improve the energy density of the battery device 100.

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

[0304] For example, the battery device 100 can be located 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 front and rear of the vehicle, the lateral direction of the vehicle is perpendicular to the longitudinal direction of the vehicle and perpendicular to the vertical direction. The vertical direction can be referred to as the Z direction in the attached figure. The longitudinal direction of the vehicle is the first direction, and the lateral direction of the vehicle is the second direction.

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

[0307] The following reference Figures 1-14 This application describes a battery device 100 according to some embodiments.

[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 arranged along the first direction. Each battery cell row 30 includes a plurality of battery cells 301 arranged along a second direction, the thickness direction of which is consistent with the second direction. The heat exchange assembly 50 is disposed within the housing 10 and located below the battery cell assemblies 20.

[0309] The housing 10 includes a base plate 11 and a top cover 13. The top cover 13 is positioned on top of the base plate 11 and connected to the base plate 11. The top cover 13 and the base plate 11 are detachably connected. The base plate 11 and the top cover 13 together define a space for accommodating the battery cell assembly 20. The base plate 11 is provided with mounting beams 12, which are arranged on opposite sides of the battery cell assembly 20 along a second direction. The battery cell assembly 20 is connected to the mounting beams 12.

[0310] The dimension of the battery cell 301 in the vertical direction is smaller than the dimension of the battery cell 301 in the first direction, and the number of battery cells in each row 30 can be 15 to 20. The ratio of the dimension of the housing 10 in the first direction to the dimension of the housing 10 in the second direction is greater than 2, and the ratio of the dimension of the housing 10 in the vertical direction to the dimension of the housing 10 in the second direction is less than 0.3. The entire battery device 100 is generally rectangular and flat.

[0311] The heat exchange assembly 50 is mounted and fixed on the base plate 11, and is thermally connected to the battery cell assembly 20. The heat exchange assembly 50 includes two heat exchange units 5 and two current collectors 6. The two current collectors 6 are arranged along a first direction. One current collector 6 forms a liquid inlet chamber and a liquid inlet 61, and the other current collector 6 forms a liquid outlet chamber 63 and a liquid outlet 62. The two connecting ends 55 of each heat exchange unit 5 are respectively connected to the two current collectors 6.

[0312] Each heat exchange unit 5 is formed as a heat exchange flat tube, and each heat exchange unit 5 has a heat exchange flow channel 51a formed inside. Each heat exchange unit 5 includes a first heat exchange section 51 and a second heat exchange section 52. The first heat exchange sections 51 of the two heat exchange units 5 together enclose a frame-shaped region, and the second heat exchange sections 52 of the two heat exchange units 5 are both located within the frame-shaped region, and the second heat exchange sections 52 of the two heat exchange units 5 are bent and extended. The frame-shaped region is a rectangular frame region, and the size of the rectangular frame region in the first direction is larger than the size of the rectangular frame region in the second direction. The second heat exchange section 52 includes a bent section 53, and the bent section 53 includes 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. The second heat exchange segment 532 is connected between the same end of two adjacent first heat exchange segments 531 along the second direction.

[0313] The two heat exchange units 5 have their bent portions 53 arranged along the first direction. The heat exchange assembly 50 also includes a connecting bracket 7, at least a portion of which is located between the two heat exchange units 5 and connects the two heat exchange units 5.

[0314] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0315] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: Box; A battery cell assembly, wherein the battery cell assembly is disposed within the housing, and the battery cell assembly comprises a plurality of battery cells; A heat exchange assembly is provided for exchanging heat with the battery cell assembly. The heat exchange assembly includes multiple heat exchange units and multiple current collectors. Each heat exchange unit is formed as a heat exchange tube and has a heat exchange flow channel. At least a portion of the heat exchange unit is bent and extended. Each heat exchange unit has two connecting ends in its extension direction. Each current collector has two current collection ports. The two connecting ends of each heat exchange unit are respectively connected to the current collection ports of different current collectors. Multiple current collectors connect multiple heat exchange units sequentially. The multiple current collectors are arranged in a horizontal direction.

2. The battery device according to claim 1, characterized in that, The height difference between any two of the current collectors in the vertical direction is less than or equal to 2 mm.

3. The battery device according to claim 1, characterized in that, The difference in thickness between any two current collectors in the vertical direction is less than or equal to 2 mm.

4. The battery device according to claim 1, characterized in that, The thickness of a single current collector in the vertical 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 collector in the vertical direction ranges from 8 mm to 13 mm.

6. The battery device according to claim 1, characterized in that, The ratio of the thickness of a single manifold in the vertical direction to the thickness of a single heat exchange unit in the vertical 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 manifold in the vertical direction to the thickness of a single heat exchange unit in the vertical direction ranges from 1.2 to 1.

7.

8. The battery device according to claim 1, characterized in that, The two collection ports of a single collection element are located on opposite sides of the collection element.

9. The battery device according to claim 1, characterized in that, The connecting end is inserted into the collection port; and / or, the connecting end is welded to the collection element.

10. The battery device according to claim 1, characterized in that, At least some of the current collectors are spaced apart.

11. The battery device according to claim 1, characterized in that, At least some of the current collectors are arranged along a first direction, which is the length direction of the housing.

12. The battery device according to claim 11, characterized in that, Along the first direction, at least two of the current collectors are at least partially offset in the second direction, which is the width direction of the housing.

13. The battery device according to claim 11, characterized in that, At least some of the manifolds have a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, and at least some of the manifolds have a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber; wherein, the liquid inlets or liquid outlets of two adjacent manifolds in the first direction are staggered in the second direction, and the second direction is the width direction of the housing.

14. The battery device according to claim 11, characterized in that, The two collection ports of a single collection element are located on opposite sides of the collection element along a second direction, which is the width direction of the housing.

15. The battery device according to claim 1, characterized in that, Multiple of the aforementioned manifolds are located at the same end of the heat exchange assembly along a first direction, which is the length direction of the housing.

16. The battery device according to claim 1, characterized in that, Multiple heat exchange units are connected end-to-end to form a ring structure through multiple manifolds.

17. The battery device according to claim 1, characterized in that, At least a portion of the manifold has a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, at least a portion of the manifold has a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber, one of the two connection ends of each heat exchange unit is communicating with the liquid inlet chamber through the manifold, and the other of the two connection ends of each heat exchange unit is communicating with the liquid outlet chamber through the manifold.

18. The battery device according to claim 17, characterized in that, There are two heat exchange units and two flow collectors. One flow collector has a liquid inlet chamber and a liquid inlet communicating with the liquid inlet chamber, and the other flow collector has a liquid outlet chamber and a liquid outlet communicating with the liquid outlet chamber.

19. The battery device according to claim 1, characterized in that, The heat exchange assembly includes a connecting bracket, and the connecting bracket connects at least two of the heat exchange units.

20. The battery device according to claim 19, characterized in that, The connecting bracket is welded to the heat exchange unit.

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

22. The battery device according to claim 21, characterized in that, The vertical dimension of the connecting bracket is less than or equal to the vertical thickness of the heat exchange unit.

23. The battery device according to claim 21, characterized in that, In the vertical 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, characterized in that, The connecting bracket includes a bracket plate and two side flanges, which are connected to opposite sides of the bracket plate and respectively connected to two adjacent heat exchange units.

25. The battery device according to claim 1, characterized in that, The heat exchange unit includes a first heat exchange section and a second heat exchange section. The first heat exchange sections of multiple heat exchange units together enclose a frame-shaped area, and the second heat exchange sections of multiple heat exchange units are all located within the frame-shaped area and extend in a bent manner.

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

27. The battery device according to claim 25, characterized in that, The second heat exchange section includes a bending section, 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 a first direction and each first heat exchange segment extends along a second direction. The second heat exchange segment is connected between the same end 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, characterized in that, 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, characterized in that, 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 to 2.

31. The battery device according to claim 27, characterized in that, There are two heat exchange units and two flow collectors. The first heat exchange parts of the two heat exchange units are connected through one of the flow collectors, and the second heat exchange parts of the two heat exchange units are connected through the other flow collector. The bent parts of the two heat exchange units are arranged along the first direction.

32. The battery device according to claim 31, characterized in that, The two heat exchange units are a first heat exchange unit and a second heat exchange unit. The second heat exchange section of the second heat exchange unit further includes a third heat exchange segment. At least a portion of the third heat exchange segment extends along the first direction. One end of the third heat exchange segment is connected to the bent portion of the second heat exchange unit, and the other end of the third heat exchange segment is connected to the second heat exchange section of the first heat exchange unit through the manifold.

33. The battery device according to claim 31, characterized in that, The heat exchange assembly further includes a connecting bracket, at least a portion of which is located between the bends of the two heat exchange units and connects the bends of the two heat exchange units.

34. The battery device according to claim 1, characterized in that, 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, characterized in that, Multiple heat exchange units are connected in parallel.

36. The battery device according to claim 1, characterized in that, The heat exchange unit is formed as a heat exchange flat tube, the thickness direction of the heat exchange unit is consistent with the vertical direction, and at least one side surface of the heat exchange unit in the thickness direction is in thermal contact or thermally connected to the battery cell assembly.

37. The battery device according to claim 1, characterized in that, The surface on which the heat exchange unit makes thermal contact or connects with the battery cell assembly is the heat exchange surface, and the heat exchange surface is a plane.

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

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, characterized in that, The heat exchange assembly is arranged on at least one side of the battery cell assembly in the vertical 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 the first projected area, and the sum of the projected areas of all the battery cells along the vertical direction is the second projected area. 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, characterized in that, The heat exchange assembly is located inside the housing.

43. An electrical device, characterized in that, The battery device includes any one of claims 1-42.

44. The electrical appliance according to claim 43, characterized in that, The electrical device is a vehicle, with the longitudinal direction of the vehicle being the first direction and the lateral direction of the vehicle being the second direction.

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