Battery and electric device

Abstract

The invention discloses a battery and a power utilization device, the battery comprises a battery monomer and a cold plate assembly, the cold plate assembly abuts against a first side wall of the battery monomer, the first side wall is the side wall with the largest area in the battery monomer, the cold plate assembly comprises a plurality of harmonica-shaped tube plates, and the harmonica-shaped tube plates are arranged at intervals along the height direction of the harmonica-shaped tube plates; at least one flow channel extending in the length direction of the harmonica-shaped tube plate is defined in each harmonica-shaped tube plate, and the first side wall is in heat conduction connection with the thickness side of each harmonica-shaped tube plate of the cold plate assembly. According to the battery provided by the embodiment of the invention, the battery has good reliability and processing convenience.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have certain requirements in terms of both reliability and ease of manufacturing. Summary of the Invention

[0003] This invention proposes a battery and an electrical device, the battery having good reliability and ease of processing.

[0004] In a first aspect, embodiments of the present invention provide a battery, including a battery cell and a cold plate assembly. The cold plate assembly abuts against a first sidewall of the battery cell. The first sidewall is the sidewall with the largest area in the battery cell. The cold plate assembly includes a plurality of harmonica tube plates, which are spaced apart along the height direction of the harmonica tube plates. Each harmonica tube plate defines at least one flow channel extending along the length direction of the harmonica tube plate. The first sidewall is thermally connected to the thickness side of each harmonica tube plate of the cold plate assembly.

[0005] In the above technical solution, by setting the cold plate assembly to include multiple harmonica tube plates spaced apart along the height direction of the harmonica tube plates, and the first sidewall being thermally connected to the thickness side of each harmonica tube plate, the heat of the battery cell can be distributed and transferred to the multiple harmonica tube plates of the cold plate assembly. This is beneficial for the battery cell to perform well and also helps to reduce the requirements for heat exchange efficiency between a single harmonica tube plate and a battery cell. At the same time, it helps to reduce the height of a single harmonica tube plate, thereby reducing the processing difficulty of the harmonica tube plate, improving processing convenience, and thus helping to improve the yield of the cold plate assembly.

[0006] In some embodiments, the cold plate assembly further includes: a buffer member, wherein a buffer member is provided between any two adjacent harmonica tubes in the height direction of the harmonica tubes to fill the gap between the two adjacent harmonica tubes, and the buffer member abuts against the first sidewall of the battery cell.

[0007] In the above technical solution, by setting a buffer between any two adjacent harmonica tubes and making the buffer abut against the first sidewall of the battery cell, the cold plate assembly can provide certain support to the battery cell at the gap between the two adjacent harmonica tubes through the buffer. This is to improve the large compressive force generated between the height end of the harmonica tube and the first sidewall due to the expansion and deformation of the battery cell in the thickness direction of the harmonica tube, which easily causes stress concentration on the first sidewall at the position corresponding to the height end of the harmonica tube. This makes it easier for the cold plate assembly to provide continuous and large-area support for the first sidewall, which helps to reduce the difference in the reaction force exerted by the cold plate assembly on the first sidewall at different positions, improves the stress on the first sidewall, and helps to improve the reliability of the battery.

[0008] In some embodiments, the battery cell is positioned at the center of the harmonica tube in the height direction and is positioned opposite one of the buffer members in the thickness direction of the harmonica tube.

[0009] In the above technical solution, since the battery cell is positioned at the middle of the height of the harmonica tube and one of the buffer components is positioned opposite to the thickness of the harmonica tube, the position of the first sidewall with the greatest expansion deformation is opposite to the buffer component, and the position of the first sidewall with the greatest expansion deformation is offset from each harmonica tube. This helps to reduce the compressive force between the harmonica tube and the first sidewall. The stiffness of the buffer component is relatively small compared to the harmonica tube, which can better absorb the expansion of the battery cell.

[0010] In some embodiments, the cushioning element is a thermal insulation material.

[0011] In the above technical solution, by setting the buffer as a heat-insulating material, it is beneficial to reduce the heat exchange between two adjacent battery cells in the thickness direction of the harmonica tube board, thereby reducing the impact between two adjacent battery cells. If a battery cell has an abnormal temperature or thermal runaway, it is beneficial to reduce its impact on adjacent battery cells, thus improving reliability.

[0012] In some embodiments, the two ends of the cold plate assembly do not exceed the first sidewall in the height direction of the harmonica tube plate.

[0013] In the above technical solution, since the two ends of the cold plate assembly do not exceed the first sidewall in the height direction of the harmonica tube board, it is easy to prevent the harmonica tube board from being scratched during battery handling and assembly while meeting the heat exchange requirements of the battery cells. Furthermore, the harmonica tube board is less likely to interfere with other components and is less likely to affect the connection of the battery cells with other components such as the housing in the height direction of the harmonica tube board. This facilitates battery assembly and makes it easier to reliably install the battery cells.

[0014] In some embodiments, the battery cell is offset from each harmonica plate in the height direction at its center position; or, the plurality of harmonica plates includes a first harmonica plate and at least one second harmonica plate, the battery cell is positioned opposite to the first harmonica plate in the thickness direction at its center position in the height direction of the harmonica plate, and is offset from the second harmonica plate in the height direction of the harmonica plate, and the stiffness of the first harmonica plate is less than the stiffness of the second harmonica plate.

[0015] In the above technical solution, since the battery cell is positioned at the middle of the harmonica plate height and each harmonica plate is staggered in the harmonica plate height direction, it is easy to stagger the position of the largest expansion deformation on the first side wall. This helps to reduce the compressive force between the harmonica plate and the first side wall, so as to improve the stress concentration generated on the first side wall at the position corresponding to the height end of the harmonica plate, thereby improving the stress on the first side wall and improving the reliability of the battery. Because the battery cell is positioned at the middle of the harmonica plate in the height direction and is opposite to the first harmonica plate in the thickness direction, and is offset from the second harmonica plate in the height direction, the position of the first sidewall with the greatest expansion deformation is opposite to the first harmonica plate, and the position of the first sidewall with the greatest expansion deformation is offset from the second harmonica plate. The stiffness of the first harmonica plate is relatively smaller than that of the second harmonica plate, which makes it easier for the first harmonica plate to better absorb the expansion of the battery cell. At the same time, it helps to reduce the compressive force between the second harmonica plate and the first sidewall, and also reduces the compressive force between the first harmonica plate and the first sidewall.

[0016] In some embodiments, there are three or more flow channels, and the outermost flow channel in the height direction of the harmonica tube plate is the first flow channel. There are at least two first flow channels. The cold plate assembly further includes: a first sealing member, and each first flow channel is provided with a first sealing member at both ends along the length direction of the harmonica tube plate to seal the first flow channel and avoid at least a portion of the other flow channels besides the first flow channel.

[0017] In the above technical solution, by setting a first sealing component to block the first flow channel, the heat exchange medium cannot flow in the first flow channel. This helps to reduce the risk of stress concentration and cracking at one end of the harmonica tube plate in the height direction due to the compression of the battery cells, which could lead to leakage of the heat exchange medium. This is beneficial to improving the reliability of the cold plate assembly. At the same time, the setting of the first sealing component will not affect the flow of the heat exchange medium in the harmonica tube plate, so that the heat exchange medium can flow through the harmonica tube plate to achieve heat exchange with the battery cells.

[0018] In some embodiments, the multiple first sealing elements at the same end of the multiple first channels along the length of the harmonica tube plate are integral or separate components.

[0019] In the above technical solution, by setting multiple first sealing components with the same length at one end of multiple first flow channels as a single piece, the assembly process of the first sealing component and the harmonica tube plate is simplified, which is conducive to improving assembly efficiency. At this time, the first sealing component can have a sealing area and a hollow area. The sealing area is opposite to the first flow channel to seal the first flow channel, while the hollow area is opposite to the other flow channels other than the first flow channel to avoid at least a part of the other flow channels. By setting multiple first sealing components with the same length at one end of multiple first flow channels as separate parts, the structure of a single first sealing component is simplified, which is convenient for processing. At the same time, it is convenient to realize that the first sealing component avoids at least a part of the other flow channels other than the first flow channel.

[0020] In some embodiments, there are multiple flow channels, and the cold plate assembly further includes: a collector, wherein each harmonica tube plate has a collector at both ends of its length, and a collection space is formed in the collector that communicates with at least two flow channels, and the collector has an inlet and an outlet for the heat exchange medium to flow into and out of the collection space.

[0021] In the above technical solution, by setting current collectors at both ends of the length of each harmonica tube sheet, the heat exchange medium in one current collector is distributed to multiple flow channels and then converges into another current collector after exchanging heat with the battery cells. This is beneficial to make full use of the cooling capacity of the heat exchange medium, improve the heat exchange efficiency between the cold plate assembly and the battery cells, and facilitate the connection between the harmonica tube sheet and the heat exchange medium pipeline through the current collector, thereby improving the convenience of battery assembly.

[0022] In some embodiments, two manifolds at the same end of the length of two adjacent harmonica tubes are integral, and the outlet of one of the manifolds is connected to the inlet of the other.

[0023] In the above technical solution, by setting two manifolds with the same length at the same end of two adjacent harmonica tubes as a single unit, so that the two adjacent harmonica tubes are connected in series, the single unit corresponding to the two manifolds does not need to be set with a separate port for connection with other pipelines. This is beneficial to simplify the structure of the manifold, facilitates processing, and also simplifies the assembly process of the manifold and the two harmonica tubes.

[0024] In some embodiments, the current collectors and battery cells are staggered along the length of the harmonica tube sheet. There are an even number of harmonica tube sheets, and two adjacent harmonica tube sheets form a tube sheet group. There are multiple tube sheet groups. The two ends of the length of each tube sheet group are the first end and the second end, respectively. The two current collectors at the first end of each tube sheet group are integral parts with a dimension of t1 along the length of the harmonica tube sheet. The two current collectors at the second end of each tube sheet group are separate parts with a dimension of t2 along the length of the harmonica tube sheet, where t1 < t2.

[0025] In the above technical solution, by setting the two current collectors at the first end of each tube sheet group as an integral part and the two current collectors at the second end as separate parts, the integral part formed by the two current collectors in multiple tube sheet groups is located at the same end of the length of multiple tube sheet groups. At the same time, since t1 < t2, and the current collectors and battery cells are staggered in the length direction of the harmonica tube sheet, the above setting can be adopted to adapt to the arrangement space when the arrangement space of the battery cells on one side of the length direction of the harmonica tube sheet is small or restricted. Of course, the above setting can also be adopted when the arrangement space of the battery cells on one side of the length direction of the harmonica tube sheet is not restricted, which is beneficial to improving the convenience, flexibility and applicability of the arrangement of battery cells and cold plate components.

[0026] In some embodiments, the two manifolds at the same end of the length of two adjacent harmonica tubes are separate components, and the two manifolds of the harmonica tubes are respectively connected to the inlet pipe and the outlet pipe.

[0027] In the above technical solution, by setting two current collectors at the same end of the length of two adjacent harmonica tube plates as separate components, it is easy to realize the parallel setting of multiple harmonica tube plates, which helps to reduce the flow resistance of the heat exchange medium in the battery and improve the flow smoothness.

[0028] In some embodiments, the spacing between two adjacent harmonica tubes is greater than or equal to the width of the channel in the height direction of the harmonica tube.

[0029] In the above technical solution, by setting the spacing between two adjacent harmonica tube plates to be greater than or equal to the width of the flow channel in the height direction of the harmonica tube plate, it is easy to make a suitable gap between the two adjacent harmonica tube plates, so that when the harmonica tube plates are squeezed and deformed, the adjacent ends of the two adjacent harmonica tube plates are less likely to interfere with each other, which is beneficial to improving the reliability of the cold plate assembly.

[0030] In some embodiments, there are multiple battery cells located on the same side of the cold plate assembly in its thickness direction and thermally connected to the cold plate assembly. The multiple battery cells are arranged sequentially along the length direction of the harmonica tube plate and form a row of battery cells.

[0031] In the above technical solution, by setting the thickness side of the cold plate assembly to be thermally connected to multiple battery cells of the battery pack, each harmonica tube plate of the cold plate assembly can exchange heat with each battery cell of the battery pack, so as to make the cold plate assembly and each battery cell have a suitable heat exchange area to meet the thermal management requirements of the battery cells.

[0032] In some embodiments, there are multiple rows of battery packs and multiple cold plate assemblies, with the multiple rows of battery packs and multiple cold plate assemblies alternately arranged along the thickness direction of the harmonica tube plate.

[0033] In the above technical solution, by setting up multiple rows of battery packs and multiple cold plate assemblies alternately along the thickness direction of the harmonica tube plate, it is easy to achieve thermal management of each row of battery packs.

[0034] Secondly, embodiments of the present invention provide an electrical device including the battery described above.

[0035] In the above technical solution, since the electrical device uses the aforementioned battery, and the battery has good thermal management performance and ease of processing, it is beneficial to improve the reliability of the electrical device and the ease of assembly. Attached Figure Description

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a schematic diagram of the vehicle structure provided for some embodiments of the present invention;

[0038] Figure 2 Exploded views of the battery structure provided for some embodiments of the present invention;

[0039] Figure 3 Exploded views of the battery structure provided for some embodiments of the present invention;

[0040] Figure 4 A schematic diagram of a battery cell provided for some embodiments of the present invention;

[0041] Figure 5 for Figure 2 A schematic diagram of the battery shown;

[0042] Figure 6 for Figure 5 An enlarged view of part A, shown in the center circle;

[0043] Figure 7 for Figure 5 Another schematic diagram of the battery shown;

[0044] Figure 8 for Figure 7 Another schematic diagram of the battery shown;

[0045] Figure 9 for Figure 8 An exploded view of the cold plate assembly shown;

[0046] Figure 10 for Figure 9 An enlarged view of section B, shown in the center circle;

[0047] Figure 11 for Figure 9 The diagram shows that the multiple first sealing components are integrated into one piece.

[0048] Figure 12 This is a schematic diagram showing that some embodiments of the present invention provide multiple first sealing components that are either separate components or a single integrated component;

[0049] Figure 13 for Figure 9 A cross-sectional view of the cold plate assembly shown;

[0050] Figure 14 for Figure 13 Enlarged view of section C, shown in the center circle;

[0051] Figure 15 for Figure 13 Enlarged view of section D shown in the center circle;

[0052] Figure 16 for Figure 9 A schematic diagram of a component consisting of two current collectors adjacent to each other at the same end, as shown in the figure;

[0053] Figure 17 A schematic diagram of a component consisting of two current collectors adjacent to each other at the same end of the same length, provided for some embodiments of the present invention;

[0054] Figure 18 for Figure 3 A schematic diagram of the battery shown;

[0055] Figure 19 for Figure 18 Another schematic diagram of the battery shown;

[0056] Figure 20 for Figure 18 Another schematic diagram of the battery shown;

[0057] Figure 21 for Figure 20 An exploded view of the cold plate assembly shown;

[0058] Figure 22 for Figure 21 The figure shows a cross-sectional view of the cold plate assembly, with the first sealing element not shown.

[0059] Figure label:

[0060] Electrical device 1000, battery 200, controller 300, motor 400

[0061] Battery cell 100, first sidewall 100a, second sidewall 100b, third sidewall 100c, battery array 100d, cold plate assembly 101, liquid inlet pipe 102, liquid outlet pipe 103, housing 104, first housing 104a, second housing 104b

[0062] Harmonica tube plate 1, flow channel 10, first flow channel 10a, second flow channel 10b, tube plate assembly 10c

[0063] Buffer 2

[0064] First sealing component 3, protrusion 31, stop portion 32, sealing area 30a, hollow area 30b.

[0065] Current collector 4, current collection space 40, inlet 40a, outlet 40b

[0066] First manifold body 41, first cavity 410, first insertion port 410a, second sealing component 42.

[0067] The second manifold body 43, the second cavity 430, the insertion slot 430a, the second insertion port 430b, and the third sealing component 44. Detailed Implementation

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 the various components shown in the accompanying drawings in the embodiments of this application are merely illustrative and should not constitute any limitation on this application.

[0073] In this application, "multiple" means two or more (including two).

[0074] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0075] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery generally includes a housing for encapsulating multiple battery cells or multiple battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells; of course, a battery may also not include a housing.

[0076] For example, a single battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to house the cell assembly and the electrolyte, and the housing has at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive electrode sheets, negative electrode sheets, and separators.

[0077] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly soldered to the positive electrode post to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are soldered to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is soldered to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0078] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the battery cell assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0079] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as a core component of new energy vehicles, have certain requirements in terms of both reliability and ease of manufacturing.

[0080] In related technologies, harmonica-shaped plates are used for thermal management of battery cells. As the height of the battery cells increases, the height of the harmonica-shaped plate also needs to increase in order to simultaneously improve the temperature control effect on the battery cells, which makes the processing of the harmonica-shaped plate difficult. For example, harmonica-shaped plates are usually formed by extrusion molding. When the height of the harmonica-shaped plate is large, it is difficult for material diffusion during molding, the uniformity of material distribution is difficult to control, and the extrusion force required is large, resulting in processing difficulties.

[0081] Based on the above considerations, a battery is proposed, which includes a battery cell and a cold plate assembly. The cold plate assembly abuts against the first sidewall of the battery cell. The first sidewall is the sidewall with the largest area in the battery cell. The cold plate assembly includes multiple harmonica tube plates, which are spaced apart along the height direction of the harmonica tube plates. Each harmonica tube plate defines at least one flow channel extending along the length direction of the harmonica tube plate. The first sidewall is thermally connected to the thickness side of each harmonica tube plate of the cold plate assembly.

[0082] In the above technical solution, the cold plate assembly includes multiple harmonica tubes spaced apart along the height direction of the harmonica tubes. The first sidewall is thermally connected to the thickness side of each harmonica tube, so that the heat of the battery cell can be distributed and transferred to the multiple harmonica tubes of the cold plate assembly. This is beneficial for the battery cell to perform well and also helps to reduce the requirements for heat exchange efficiency between a single harmonica tube and the battery cell. At the same time, it helps to reduce the height of a single harmonica tube, thereby reducing the processing difficulty of the harmonica tube and improving the processing convenience, which in turn helps to improve the yield of the cold plate assembly.

[0083] This application provides an electrical device that uses the battery disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0084] For ease of explanation, the following embodiments use a vehicle as an example to describe the structure of the electrical device 1000 and the battery 200 of this application.

[0085] Please refer to Figure 1 , Figure 1The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle is equipped with a battery 200, which can be located at the bottom, front, or rear of the vehicle. The battery 200 can be used to supply power to the vehicle; for example, the battery 200 can serve as the vehicle's operating power source. The vehicle may also include a controller 300 and a motor 400. The controller 300 is used to control the battery 200 to supply power to the motor 400, for example, to meet the power needs of starting, navigation, and driving the vehicle. In some embodiments of this application, the battery 200 can not only serve as the vehicle's operating power source but also as the vehicle's driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle.

[0086] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery cell 100 used in a battery 200 according to some embodiments of this application. The battery 200 includes a housing 104 and a plurality of battery cells 100, with the battery cells 100 housed within the housing 104. The housing 104 provides assembly space for the battery cells 100, and can employ various structures. In some embodiments, the housing 104 may include a first housing 104a and a second housing 104b, which overlap each other, and together define a receiving cavity for accommodating the battery cells 100. The second housing 104b can be a hollow structure open at one end, and the first housing 104a can be a plate-like structure. The first housing 104a covers the open side of the second housing 104b, so that the first housing 104a and the second housing 104b together define the receiving cavity; or, the first housing 104a and the second housing 104b can both be hollow structures open on one side (e.g., Figure 2 As shown, the open side of the first box 104a closes to the open side of the second box 104b. Of course, the box 104 formed by the first box 104a and the second box 104b can be of various shapes, such as a cylinder or a cuboid.

[0087] In battery 200, multiple battery cells 100 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 100 is housed within housing 104. Alternatively, battery 200 can also be composed of multiple battery cells 100 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 104. Battery 200 may also include other structures; for example, battery 200 may also include a busbar for electrical connection between multiple battery cells 100.

[0088] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 100 provided in some embodiments of this application. The battery cell 100 is cuboid, and the height direction Z of the battery cell 100 is the height direction of the harmonica plate 1, the length direction Y of the battery cell 100 is the length direction of the harmonica plate 1, and the thickness direction X of the battery cell 100 is the thickness direction of the harmonica plate 1. Directions X, Y, and Z are mutually perpendicular. However, this is not a limitation; in other embodiments of this application, the battery cell may also be a polygonal prism, a flat body, or other shapes.

[0089] Please refer to Figures 5-7 In the embodiments of this application, the battery 200 includes a battery cell 100 and a cold plate assembly 101, the cold plate assembly 101 abutting against the first sidewall 100a of the battery cell 100.

[0090] The cold plate assembly 101 includes a plurality of harmonica tube plates 1, which are spaced apart along the height direction of the harmonica tube plates 1. Each harmonica tube plate 1 defines at least one flow channel 10, which extends along the length direction of the harmonica tube plate 1. The first sidewall 100a is thermally connected to the thickness side of each harmonica tube plate 1 of the cold plate assembly 101, so that the battery cell 100 and each harmonica tube plate 1 of the cold plate assembly 101 can exchange heat to regulate the temperature of the battery cell 100.

[0091] It should be noted that, in the description of this application, "thermal conductive connection" can be understood as heat exchange between two components, including direct heat exchange between the two components (the heat of one component is directly transferred to the other component, and the two components are in contact), and indirect heat exchange between the two components (the heat of one component is transferred to the other component through other structures such as thermally conductive adhesive, thermally conductive parts, etc.); moreover, "thermal conductive connection" can refer to any one of the two components transferring heat to the other component, that is, for one component, the component can transfer heat to the other component, or the other component can also transfer heat to the component.

[0092] It is understandable that the flow channel 10 can accommodate the heat exchange medium to achieve temperature regulation of the battery cell 100. Moreover, the flow channel 10 can reduce the weight of the harmonica tube plate 1 while ensuring sufficient structural strength. In addition, the flow channel 10 can also allow the harmonica tube plate 1 to have a certain compression space in its thickness direction, so that the harmonica tube plate 1 can provide a certain expansion and deformation space for the battery cell 100 to a certain extent.

[0093] The heat exchange medium can be a liquid or a gas, and temperature regulation refers to heating or cooling one or more battery cells 100. When cooling the battery cell 100, the flow channel 10 can contain a cooling medium to regulate the temperature of one or more battery cells 100. In this case, the heat exchange medium can also be called a cooling medium or cooling fluid, more specifically, a coolant or a cooling gas. Alternatively, the heat exchange medium can also be used for heating, and this embodiment is not limited to this. Obviously, when the temperature of the battery cell 100 is too high, the harmonica plate 1 can cool the battery cell 100 to lower its temperature; when the temperature of the battery cell 100 is too low, the harmonica plate 1 can heat the battery cell 100 to raise its temperature. In the following description of this application, the cooling of the battery cell 100 by the harmonica plate 1 is used as an example.

[0094] Optionally, the heat exchange medium can be circulated to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and ethylene glycol, heat transfer oil, refrigerant, or air, etc. Optionally, the cooling medium has a high specific heat capacity to remove more heat, and at the same time, the cooling medium has a low boiling point so that it can quickly boil and vaporize to absorb heat when the battery cell experiences thermal runaway at 100°C.

[0095] As can be seen, since the first sidewall 100a is thermally connected to the thickness side of each harmonica plate 1 of the cold plate assembly 101, the thickness sides of the multiple harmonica plates 1 of the cold plate assembly 101 can respectively exchange heat with the first sidewall 100a of the battery cell 100. This allows each harmonica plate 1 to conduct heat from the battery cell 100, meaning the heat from the battery cell 100 can be distributed and transferred to the multiple harmonica plates 1 of the cold plate assembly 101. This helps to keep the temperature of the battery cell 100 within a suitable range, which is beneficial for extending the service life of the battery cell 100 and for the battery cell 100 to perform its function. It also helps to reduce the requirements for heat exchange efficiency between a single harmonica plate 1 and the battery cell 100. Furthermore, relative to the first sidewall 100 of the battery cell 100... In the scheme of heat exchange between one side wall 100a and a harmonica tube plate 1, the height of the harmonica tube plate 1 needs to be matched with the height of the first side wall 100a to be relatively large. Usually, the harmonica tube plate 1 is extruded. When the height of the harmonica tube plate 1 is large, it is difficult for material to diffuse during the molding process, the uniformity of material distribution is difficult to control, and the extrusion force requirement is large, resulting in processing difficulties. The above-mentioned setting of this application is also conducive to reducing the height of a single harmonica tube plate 1, thereby reducing the processing difficulty of the harmonica tube plate 1, improving processing convenience, and thus improving the pass rate of the cold plate assembly 101. For example, when the harmonica tube plate 1 is extruded, because its height is small, the material is easier to diffuse and distribute evenly during the molding process, and the extrusion force requirement is relatively low.

[0096] It is evident that the above-mentioned configuration of this application is particularly applicable to scenarios where the height of the first sidewall 100a is relatively large; for example, if the height of the first sidewall 100a reaches 500mm or more, the first sidewall 100a is thermally connected to multiple harmonica tube boards 1 respectively, so as to reduce the processing difficulty of the harmonica tube board 1 while meeting the cooling requirements of the battery cell 100. Of course, when the height of the first sidewall 100a is less than 500mm, the above-mentioned solution of this application is also applicable.

[0097] It is understood that the battery 200 may include one or more battery cells 100, and the battery 200 may include one or more cold plate assemblies 101; for a single battery cell 100, its first sidewall 100a is thermally connected to all the harmonica tube plates 1 of the corresponding cold plate assembly 101 on the same side of the thickness. For example, if the battery cell 100 has multiple first sidewalls 100a, then at least one of the multiple first sidewalls 100a is thermally connected to the corresponding cold plate assembly 101. Of course, the battery cell 100 may also have one first sidewall 100a.

[0098] Please refer to the following: Figure 4 , Figure 5 , Figure 7 and Figure 18The first sidewall 100a is the sidewall with the largest area in the battery cell 100. Therefore, the first sidewall 100a can be understood as the "large surface" of the battery cell 100, and the thickness direction of the harmonica tube plate 1 can be understood as perpendicular to the first sidewall 100a. This helps to increase the heat exchange area between each harmonica tube plate 1 and the battery cell 100, thereby improving the heat exchange efficiency between them. It also allows for a further reduction in the height of the harmonica tube plate 1 while meeting the cooling requirements of the battery cell 100, thus improving its processing convenience.

[0099] For example, the battery cell 100 has a cuboid structure and has two first sidewalls 100a arranged opposite each other along the thickness direction of the harmonica plate 1. At least one of the two first sidewalls 100a is thermally connected to the cold plate assembly 101. The battery cell 100 also has two second sidewalls 100b arranged opposite each other along the length direction of the harmonica plate 1 and two third sidewalls 100c arranged opposite each other along the height direction of the harmonica plate 1. The area of ​​the first sidewall 100a is larger than the area of ​​the second sidewall 100b and larger than the area of ​​the third sidewall 100c.

[0100] In the above technical solution, by setting the cold plate assembly 101 to include a plurality of harmonica tube plates 1 spaced apart along the height direction of the harmonica tube plates 1, and the first sidewall 100a being thermally connected to the thickness side of each harmonica tube plate 1, at least most of the heat of the battery cell 100 can be distributed and transferred to the plurality of harmonica tube plates 1 of the cold plate assembly 101, which is beneficial for the battery cell 100 to perform its function, and at the same time, it is beneficial to reduce the requirements for heat exchange efficiency between a single harmonica tube plate 1 and the battery cell 100; at the same time, it is beneficial to reduce the height of a single harmonica tube plate 1, thereby reducing the processing difficulty of the harmonica tube plate 1, improving processing convenience, and thus improving the yield of the cold plate assembly 101.

[0101] Please refer to Figure 7 In some embodiments of the present invention, the cold plate assembly 101 further includes a buffer 2. A buffer 2 is provided between any two adjacent harmonica tube plates 1 in the height direction of the harmonica tube plate 1 to fill the gap between the two adjacent harmonica tube plates 1. The buffer 2 abuts against the first side wall 100a of the battery cell 100.

[0102] In the above technical solution, by setting a buffer 2 between any two adjacent harmonica tube plates 1, and making the buffer 2 abut against the first sidewall 100a of the battery cell 100, the cold plate assembly 101 provides certain support to the battery cell 100 at the gap between the two adjacent harmonica tube plates 1 through the buffer 2. This improves the large compressive force generated between the height end of the harmonica tube plate 1 and the first sidewall 100a due to the expansion and deformation of the battery cell 100 in the thickness direction of the harmonica tube plate 1, which easily causes stress concentration in the first sidewall 100a at the position corresponding to the height end of the harmonica tube plate 1. This facilitates the cold plate assembly 101 to provide continuous and large-area support for the first sidewall 100a, which helps to reduce the difference in the reaction force exerted by the cold plate assembly 101 on the first sidewall 100a at different positions, improves the stress on the first sidewall 100a, and helps to improve the reliability of the battery 200.

[0103] It is understood that there can be one or more buffers 2. When there are multiple buffers 2, multiple harmonica tube plates 1 and multiple buffers 2 can be alternately arranged along the height direction of the harmonica tube plates 1. In the cold plate assembly 101, the number of harmonica tube plates 1 is one more than the number of buffers 2.

[0104] For example, such as Figures 4-7 As shown, the first sidewall 100a is the sidewall with the largest area in the battery cell 100. When the battery cell 100 expands, the expansion deformation of the first sidewall 100a is relatively larger than that of other sidewalls, resulting in a relatively large compressive force between the first sidewall 100a and the harmonica tube plate 1. At this time, the cold plate assembly 101 also includes a buffer member 2, with a buffer member 2 provided between any two adjacent harmonica tube plates 1 to fill the gap between them. The buffer member 2 abuts against the first sidewall 100a of the battery cell 100. Therefore, the buffer member 2 can improve the reaction force exerted by the cold plate assembly 101 on the first sidewall 100a due to its expansion deformation, thus improving the uniformity of the reaction force exerted by the cold plate assembly 101 on the first sidewall 100a.

[0105] Please refer to Figure 7 In some embodiments, the battery cell 100 is positioned at the middle of the height direction of the harmonica tube plate 1 and one of the buffer members 2 is positioned opposite to the thickness direction of the harmonica tube plate 1. The projection of the battery cell 100 at the middle of the height direction of the harmonica tube plate 1 along the thickness direction of the harmonica tube plate 1 is denoted as the first projection, and the projection of the aforementioned buffer member 2 is denoted as the third projection. The first projection and the third projection partially overlap.

[0106] In the above technical solution, since the battery cell 100 is positioned at the middle of the height direction of the harmonica tube plate 1 and one of the buffer members 2 is positioned opposite to the thickness direction of the harmonica tube plate 1, the position of the first sidewall 100a with the greatest expansion deformation is opposite to the buffer member 2, and the position of the first sidewall 100a with the greatest expansion deformation is staggered from each harmonica tube plate 1, which helps to reduce the compressive force between the harmonica tube plate 1 and the first sidewall 100a. The stiffness of the buffer member 2 is relatively small compared to the harmonica tube plate 1, which can better absorb the expansion of the battery cell 100.

[0107] For example, such as Figure 7 As shown, the cold plate assembly 101 includes two harmonica plates 1 and a buffer member 2. The battery cell 100 is positioned at the center of the harmonica plate 1 in the height direction and is positioned opposite the buffer member 2 in the thickness direction of the harmonica plate 1, and is offset from each harmonica plate 1 in the height direction. Of course, the cold plate assembly 101 may also include multiple buffer members 2, one of which satisfies the above-mentioned configuration requirements.

[0108] It can be understood that the middle position of the battery cell 100 in the height direction of the harmonica plate 1 can be understood as the center of the first sidewall 1 in the height direction of the harmonica plate 1, for example, Figure 7 The center of the first sidewall 1 of multiple battery cells 100 in the height direction of the harmonica tube plate 1 is located on the center plane Q.

[0109] Please refer to Figures 6-8 In some embodiments, in the height direction of the harmonica plate 1, the two ends of the cold plate assembly 101 do not exceed the first sidewall 100a. The cold plate assembly 101 is then spaced between the two ends of the first sidewall 100a in the height direction of the harmonica plate 1, and the dimension of the first sidewall 100a in the height direction of the harmonica plate 1 is larger than the dimension of the cold plate assembly 101 in the height direction of the harmonica plate 1. For example, taking the height direction of the harmonica plate 1 as the vertical direction, the upper end of the first sidewall 100a is higher than the upper end of the cold plate assembly 101, and the lower end of the first sidewall 100a is lower than the lower end of the cold plate assembly 101.

[0110] In the above technical solution, since the two ends of the cold plate assembly 101 do not exceed the first sidewall 100a in the height direction of the harmonica tube plate 1, it is easy to prevent the harmonica tube plate 1 from being scratched during the handling and assembly of the battery 200 while meeting the heat exchange requirements of the battery cell 100. In addition, the harmonica tube plate 1 is less likely to interfere with other components, and it is also less likely to affect the connection between the battery cell 100 and other components such as the housing in the height direction of the harmonica tube plate 1. This facilitates the assembly of the battery 200 and makes it easier to reliably install the battery cell 100.

[0111] Optionally, in the height direction of the harmonica plate 1, the distance h between one end of the first sidewall 100a and the corresponding end of the cold plate assembly 101 is within the range of 1mm to 10mm (including the endpoint value). For example, taking the height direction of the harmonica plate 1 as the vertical direction, the upper end of the first sidewall 100a and the upper end of the cold plate assembly 101 are separated by a vertical distance h1, and the lower end of the first sidewall 100a and the lower end of the cold plate assembly 101 are separated by a vertical distance h2, where 1mm ≤ h1 ≤ 10mm, 1mm ≤ h2 ≤ 10mm, and h1 and h2 can be equal or unequal.

[0112] Optionally, h1 can be 1mm, 3mm, 4mm, 5mm, 8mm or 10mm, etc.; h2 can be 1mm, 2mm, 5mm, 6mm, 7mm, 9mm or 10mm, etc.

[0113] Please refer to Figure 7 and Figure 19 In some embodiments, the battery cell 100 is offset from each harmonica plate 1 in the height direction of the middle position in the height direction of the harmonica plate 1. Then, along the thickness direction of the harmonica plate 1, the projection of the battery cell 100 at the middle position in the height direction of the harmonica plate 1 is denoted as the first projection, and the projection of the harmonica plate 1 is denoted as the second projection. The first projection and the second projection are offset and do not overlap in the height direction of the harmonica plate 1.

[0114] In the aforementioned technical room, since the battery cell 100 is positioned at the middle of the harmonica plate 1 in the height direction and is staggered from each harmonica plate 1 in the height direction, it is convenient to stagger the position of the largest expansion deformation on the first side wall 100a. This helps to reduce the compressive force between the harmonica plate 1 and the first side wall 100a, thereby improving the stress concentration generated at the position of the first side wall 100a corresponding to the height end of the harmonica plate 1, thus improving the stress on the first side wall 100a and improving the reliability of the battery 200.

[0115] Of course, this application is not limited to this; in some other embodiments, the plurality of harmonica tube plates 1 include a first harmonica tube plate 1 and at least one second harmonica tube plate 1, the battery cell 100 is disposed at the middle position in the height direction of the harmonica tube plate 1 opposite to the first harmonica tube plate 1 in the thickness direction of the harmonica tube plate 1, and the middle position of the battery cell 100 in the height direction of the harmonica tube plate 1 is offset from the second harmonica tube plate 1 in the height direction of the harmonica tube plate 1. The stiffness of the first harmonica tube plate 1 is less than the stiffness of the second harmonica tube plate 1, so the ability of the first harmonica tube plate 1 to resist deformation is weaker than the ability of the second harmonica tube plate 1 to resist deformation.

[0116] In the above technical solution, since the battery cell 100 is positioned at the middle of the height direction of the harmonica plate 1 and is opposite to the first harmonica plate 1 in the thickness direction, and is offset from the second harmonica plate 1 in the height direction, the position of the first sidewall 100a with the greatest expansion deformation is opposite to the first harmonica plate 1, and the position of the first sidewall 100a with the greatest expansion deformation is offset from the second harmonica plate 1. The rigidity of the first harmonica plate 1 is smaller than that of the second harmonica plate 1, which makes it easier for the first harmonica plate 1 to better absorb the expansion of the battery cell 100. At the same time, it helps to reduce the compressive force between the second harmonica plate 1 and the first sidewall 100a, and also reduces the compressive force between the first harmonica plate 1 and the first sidewall 100a.

[0117] Please refer to Figures 9-15 In some embodiments, there are three or more flow channels 10. Among the multiple flow channels 10, the outermost flow channel 10 in the height direction of the harmonica plate 1 is the first flow channel 10a. There are at least two first flow channels 10a. For a single first flow channel 10a, the first flow channel 10a corresponds to one end of the harmonica plate 1 in its height direction. For example, multiple flow channels 10 are spaced apart along the height direction of the harmonica plate 1. In this case, there are two first flow channels 10a, and the remaining flow channels 10 other than the first flow channel 10a are the second flow channels 10b. Of course, there can also be three or more first flow channels 10a.

[0118] The cold plate assembly 101 also includes a first sealing member 3. Each first flow channel 10a is provided with a first sealing member 3 at both ends along the length direction of the harmonica tube plate 1 to block the first flow channel 10a and avoid at least a part of the other flow channels 10 other than the first flow channel 10a. In this way, the heat exchange medium will not be contained in the first flow channel 10a, while the other flow channels 10 other than the first flow channel 10a are not blocked by the first sealing member 3 and can all contain the heat exchange medium.

[0119] In the above technical solution, by setting the first sealing member 3 to block the first flow channel 10a, the heat exchange medium cannot flow in the first flow channel 10a. This helps to reduce the risk of stress concentration and cracking at one end of the harmonica tube plate 1 in the height direction due to the compression of the battery cell 100, which could lead to leakage of the heat exchange medium. This is beneficial to improving the reliability of the cold plate assembly 101. At the same time, the setting of the first sealing member 3 will not affect the flow of the heat exchange medium in the harmonica tube plate 1, so that the heat exchange medium can flow through the harmonica tube plate 1 to achieve heat exchange with the battery cell 100.

[0120] For example, such as Figure 10As shown, the end of the harmonica tube plate 1 in the height direction is constructed into a pointed structure. This pointed structure is prone to cracking at the pointed position due to the compression of the battery cell 100. The above-mentioned arrangement of this application can prevent the heat exchange medium from flowing in the first flow channel 10a corresponding to the pointed structure, thereby solving the problem of easy leakage of the heat exchange medium.

[0121] Optionally, such as Figure 10 , Figure 11 , Figure 14 and Figure 15 As shown, the first sealing member 3 includes a protrusion 31 and a stop portion 32. The stop portion 32 is arranged around the protrusion 31 and located at the edge of the first sealing member 3. The protrusion 31 is inserted into the corresponding first flow channel 10a, and the stop portion 32 abuts against one end of the length of the peripheral wall of the first flow channel 10a, so as to achieve reliable assembly of the first sealing member 3 and the harmonica tube plate 1 while sealing the first flow channel 10a.

[0122] Please refer to Figures 10-12 In some embodiments, multiple first sealing elements 3 at the same end of multiple first flow channels 10a along the length of the harmonica tube plate 1 are integral parts (e.g., Figure 11 and Figure 12 (b) shown) or separate components (such as Figure 12 As shown in (a), for the first flow channel 10a, first sealing members 3 are provided at both ends of its length. The number of first sealing members 3 at the same end of the length of the harmonica tube plate 1 is equal to the number of first flow channels 10a. These first sealing members 3 can be integral or separate. The length direction of the first flow channel 10a can be understood as the length direction of the harmonica tube plate 1.

[0123] In the above technical solution, by setting multiple first sealing parts 3 with the same length at one end of multiple first flow channels 10a as a single piece, the assembly process of the first sealing parts 3 and the harmonica tube plate 1 is simplified, which is conducive to improving assembly efficiency. At this time, the first sealing part 3 can have a sealing area 30a and a hollow area 30b. The sealing area 30a is opposite to the first flow channel 10a to seal the first flow channel 10a, while the hollow area 30b is opposite to the other flow channels 10 other than the first flow channel 10a to avoid at least a part of the other flow channels 10. By setting multiple first sealing parts 3 with the same length at one end of multiple first flow channels 10a as separate pieces, the structure of a single first sealing part 3 is simplified, which is convenient for processing. At the same time, it is convenient to realize the avoidance of the first sealing part 3 of the other flow channels 10 other than the first flow channel 10a.

[0124] In other embodiments of this application, the first sealing element 3 may not be provided at either end of the length of the first flow channel 10a.

[0125] Please refer to Figure 9 , Figure 13 and Figure 21 In some embodiments, there are multiple flow channels 10, and the cold plate assembly 101 also includes a collector 4. Each harmonica tube plate 1 has a collector 4 at both ends of its length. The collector 4 forms a collection space 40 that communicates with at least two flow channels 10. The collector 4 has an inlet 40a and an outlet 40b for the heat exchange medium to flow into and out of the collection space 40. The heat exchange medium can flow into the collection space 40 through the inlet 40a, and the heat exchange medium in the collection space 40 can flow out through the outlet 40b.

[0126] In the above technical solution, by setting current collectors 4 at both ends of the length of each harmonica tube plate 1, the heat exchange medium in one current collector 4 is distributed to multiple flow channels 10 and then converges into another current collector 4 after exchanging heat with the battery cell 100. This is beneficial to make full use of the cooling capacity of the heat exchange medium, improve the heat exchange efficiency between the cold plate assembly 101 and the battery cell 100, and at the same time facilitate the connection between the harmonica tube plate 1 and the heat exchange medium pipeline through the current collector 4, which improves the assembly convenience of the battery 200.

[0127] Please refer to Figure 9 In some embodiments, a portion of the two current collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 is a single piece, that is, a portion of one of the two current collectors 4 is formed into a single piece with a portion of the other, and the outlet 40b of one of the two current collectors 4 is connected to the inlet 40a of the other, so that the two current collectors 4 are connected in series. Then the flow channels 10 of the two adjacent harmonica tube plates 1 are connected in series, that is, the heat exchange medium first flows through one of the two adjacent harmonica tube plates 1, and then flows to the other through the single piece formed by the two current collectors 4.

[0128] In the above technical solution, by setting a portion of the two collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 as a single piece, so that the two adjacent harmonica tube plates 1 are connected in series, the single piece corresponding to the two collectors 4 does not need to be separately set with a pipe opening for connection with other pipelines, which is beneficial to simplify the structure of the collector 4, facilitates processing, and also simplifies the assembly process of the collector 4 and the two harmonica tube plates 1.

[0129] Optionally, in the cold plate assembly 101, a portion of the two manifolds 4 at the same end of the length of any two adjacent harmonica tube plates 1 are integral parts, and the outlet 40b of one of the two manifolds 4 is connected to the inlet 40a of the other. In the remaining two manifolds 4 in the cold plate assembly 101, the inlet 40a of one of them is connected to the liquid inlet pipe 102, and the outlet 40b of the other is connected to the liquid outlet pipe 103, so that the multiple harmonica tube plates 1 of the cold plate assembly 101 are connected in series. In other examples, there are an even number of harmonica tube sheets 1, and two adjacent harmonica tube sheets 1 form a tube sheet group 10c. There are multiple tube sheet groups 10c, and the two ends of the length of each tube sheet group 10c are the first end and the second end, respectively. Part of the two current collectors 4 at the first end of each tube sheet group 10c are integral parts. The two harmonica tube sheets 1 of the tube sheet group 10c are connected in series. At this time, the inlet 40a of one of the remaining two current collectors 4 in each tube sheet group 10c is connected to the liquid inlet pipe 102, and the outlet 40b of the other is connected to the liquid outlet pipe 103, so that when there are multiple tube sheet groups 10c, the multiple tube sheet groups 10c are connected in parallel; or, when there are multiple tube sheet groups 10c, the outlet 40b of one of the two adjacent current collectors 4 at the second end of two adjacent tube sheet groups 10c is connected to the inlet 40a of the other, so that the two adjacent tube sheet groups 10c are connected in series.

[0130] For example, the cold plate assembly 101 includes two harmonica tube plates 1. A portion of the two current collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 is a single piece. Then the flow channels 10 of the two harmonica tube plates 1 can be connected in series, and the flow path of the heat exchange medium in the cold plate assembly 101 is approximately U-shaped. Of course, when the cold plate assembly 101 includes three or more harmonica tube plates 1, since a portion of the two current collectors 4 at the same length end of two adjacent harmonica tube plates 1 are integral parts, the flow channels 10 of the above-mentioned multiple harmonica tube plates 1 can be connected in series, and the flow path of the heat exchange medium in the cold plate assembly 101 is roughly S-shaped; taking the cold plate assembly 101 including three harmonica tube plates 1 as an example, the three harmonica tube plates 1 are sequentially the first harmonica tube plate 1, the second harmonica tube plate 1 and the third harmonica tube plate 1, a portion of the current collector 4 at one end of the length of the second harmonica tube plate 1 and a portion of the current collector 4 at the corresponding end of the length of the first harmonica tube plate 1 are integral parts, and a portion of the current collector 4 at the other end of the length of the second harmonica tube plate 1 and a portion of the current collector 4 at the corresponding end of the length of the third harmonica tube plate 1 are integral parts.

[0131] Please refer to Figure 16In some embodiments, the component formed by two current collectors 4 at the same end of the length of two adjacent harmonica tubes 1 includes a first current collector body 41 and a second sealing member 42. The first current collector body 41 and the second sealing member 42 are separate components, while the first current collector body 41 is a single piece. A first cavity 410 is defined within the first current collector body 41. Both ends of the first cavity 410 are open in the height direction of the harmonica tube. The open end of the first cavity 410 is provided with a second sealing member 42. A plurality of spaced first insertion ports 410a are formed on the side wall of the first cavity 410, and the harmonica tube is inserted into the corresponding first insertion port 410a. It can be seen that the first cavity 410 corresponds to the current collection space 40 of the two current collectors 4.

[0132] In the above technical solution, the component formed by setting two current collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 includes a first current collector body 41 and a second sealing component 42. The first current collector body 41 is an integral part. Under the premise of realizing reliable connection between the two current collectors 4 and the corresponding two harmonica tube plates 1, it facilitates the assembly of the first current collector body 41 and the second sealing component 42, and simplifies the processing difficulty of the first current collector body 41 and the first sealing component.

[0133] For example, the first manifold body 41 is an extruded integral part; the harmonica tube plate is inserted into the corresponding first insertion port 410a, and the harmonica tube plate is welded and fixed to the first manifold body 41.

[0134] Please refer to Figure 17 In other embodiments, the component formed by two current collectors 4 at the same end of the length of two adjacent harmonica tubes 1 includes a second current collector body 43 and a third sealing member 44. The second current collector body 43 and the third sealing member 44 are separate components, while the second current collector body 43 is a single piece. A second cavity 430 is defined within the second current collector body 43. Both ends of the second cavity 430 are closed in the height direction of the harmonica tube. A fitting groove 430a is formed on the side wall of the second cavity 430. The third sealing member 44 is disposed at the fitting groove 430a and divides the fitting groove 430a into a plurality of spaced second fitting ports 430b. The harmonica tube is inserted into the corresponding second fitting port 430b. It can be seen that the second cavity 430 corresponds to the current collection space 40 of the two current collectors 4.

[0135] In the above technical solution, the component formed by setting two current collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 includes a second current collector body 43 and a third sealing component 44. The second current collector body 43 is an integral part, which facilitates the assembly of the first current collector body 41 and the second sealing component 42 under the premise of realizing a reliable connection between the two current collectors 4 and the corresponding two harmonica tube plates 1, and simplifies the processing difficulty of the first current collector body 41 and the first sealing component.

[0136] For example, the third sealing element 44 is welded and fixed to the second manifold body 43.

[0137] Of course, the embodiments in this application are not limited to this; please refer to Figure 18 and Figure 19 In other embodiments, the two manifolds 4 at the same end of the length of two adjacent harmonica tube plates 1 are separate components. For a single harmonica tube plate 1, the two manifolds 4 of the harmonica tube plate 1 are connected to the liquid inlet pipe 102 and the liquid outlet pipe 103 respectively, so that the multiple harmonica tube plates 1 of the cold plate assembly 101 are arranged in parallel. When there are multiple cold plate assemblies 101, the multiple cold plate assemblies 101 can also be arranged in parallel.

[0138] In the above technical solution, by setting two current collectors 4 at the same end of the length of two adjacent harmonica tube plates 1 as separate components, it is easy to realize the parallel setting of multiple harmonica tube plates 1, which helps to reduce the flow resistance of the heat exchange medium in the battery 200 and improve the flow smoothness.

[0139] Please refer to Figures 19-21 In some embodiments, the current collector 4 and the battery cell 100 are staggered along the length of the harmonica tube plate 1. Then, along the thickness direction of the harmonica tube plate 1, the projection of the current collector 4 is staggered from the projection of all the battery cells 100 and does not overlap. There are an even number of harmonica tube plates 1. Two adjacent harmonica tube plates 1 form a tube plate group 10c. There are multiple tube plate groups 10c. The two ends of the length of each tube plate group 10c are the first end and the second end, respectively. The two current collectors 4 at the first end of each tube plate group 10c are integral parts, and the dimension of the integral part formed by the two current collectors 4 in the length direction of the harmonica tube plate 1 is t1. The two current collectors 4 at the second end of each tube plate group 10c are separate parts, and the dimension of the two current collectors 4 in the length direction of the harmonica tube plate 1 is t2, where t1 < t2.

[0140] In the above technical solution, by setting the two current collectors 4 at the first end of each tube sheet group 10c as an integral part and the two current collectors 4 at the second end as separate parts, the integral parts formed by the two current collectors 4 in the multiple tube sheet groups 10c are located at the same end of the length of the multiple tube sheet groups 10c. At the same time, since t1 < t2, and the current collectors 4 and the battery cells 100 are staggered in the length direction of the harmonica tube sheet 1, the above setting can be adopted to adapt to the arrangement space when the arrangement space of the battery cells 100 on one side of the length direction of the harmonica tube sheet 1 is small or restricted. Of course, the above setting can also be adopted when the arrangement space of the battery cells 100 on one side of the length direction of the harmonica tube sheet 1 is not restricted. This is beneficial to improving the convenience, flexibility and applicability of the arrangement of the battery cells 100 and the cold plate assembly 101.

[0141] Please refer to Figure 8 and Figure 10In some embodiments, the spacing x between two adjacent harmonica tube plates 1 is greater than or equal to the width d of the flow channel 10 in the height direction of the harmonica tube plate 1.

[0142] In the above technical solution, by setting the distance x between two adjacent harmonica tube plates 1 to be greater than or equal to the width d of the flow channel 10 in the height direction of the harmonica tube plate 1, it is easy to make a suitable gap between the two adjacent harmonica tube plates 1, so that when the harmonica tube plate 1 is squeezed and deformed, the ends of the two adjacent harmonica tube plates 1 that are close to each other are less likely to interfere, which is beneficial to improving the reliability of the cold plate assembly 101.

[0143] In some embodiments, the buffer element 2 is a heat-insulating material.

[0144] In the above technical solution, by setting the buffer 2 as a heat insulation material, it is beneficial to reduce the heat exchange between two adjacent battery cells 100 in the thickness direction of the harmonica tube plate 1, thereby reducing the influence between two adjacent battery cells 100. If a battery cell 100 has an abnormal temperature or thermal runaway, it is beneficial to reduce its impact on adjacent battery cells 100, which helps to improve reliability.

[0145] For example, when the buffer 2 is a heat insulation material, the buffer 2 can be MPP (microporous foamed polypropylene), aerogel, silicone foam, or rubber, etc.

[0146] Please refer to Figure 5 , Figure 7 and Figure 18 In some embodiments, there are multiple battery cells 100 located on the same side of the cold plate assembly 101 in its thickness direction and thermally connected to the cold plate assembly 101. These multiple battery cells 100 are arranged sequentially along the length direction of the harmonica tube plate 1 and form a row of battery bars 100d.

[0147] In the above technical solution, by setting the thickness side of the cold plate assembly 101 to be thermally connected to the multiple battery cells 100 of the battery pack 100d, each harmonica tube plate 1 of the cold plate assembly 101 can exchange heat with each battery cell 100 of the battery pack 100d, so that the cold plate assembly 101 and each battery cell 100 have a suitable heat exchange area to meet the thermal management requirements of the battery cell 100.

[0148] Please refer to Figure 5 , Figure 7 and Figure 18In some embodiments, there are multiple rows of battery packs 100d and multiple cold plate assemblies 101. The multiple rows of battery packs 100d and multiple cold plate assemblies 101 are arranged alternately along the thickness direction of the harmonica tube plate 1, so that a cold plate assembly 101 is provided between two adjacent rows of battery packs 100d and a row of battery packs 100d is provided between two adjacent cold plate assemblies 101. Of course, cold plate assemblies 101 can also be provided on at least one side of the multiple battery packs 100d in the thickness direction of the harmonica tube plate 1.

[0149] In the above technical solution, by setting multiple rows of battery bars 100d and multiple cold plate assemblies 101 alternately along the thickness direction of the harmonica tube plate 1, it is convenient to realize the thermal management of each row of battery bars 100d.

[0150] Secondly, embodiments of this application provide an electrical device 1000, including the aforementioned battery 200, which is used to provide electrical energy.

[0151] In the above technical solution, since the power-consuming device 1000 uses the aforementioned battery 200, and the battery 200 has good thermal management performance and ease of processing, it is beneficial to improve the reliability of the power-consuming device 1000 and the ease of assembly.

[0152] Please refer to this again. Figure 2 , Figure 3 , Figures 5-20 This application describes a specific embodiment of the battery 200.

[0153] The battery 100 includes multiple battery cells 100 and multiple cold plate assemblies 101. The multiple battery cells 100 and multiple cold plate assemblies 100 are arranged alternately along the thickness direction of the harmonica plate 1. Each cold plate assembly 101 abuts against the first sidewall 100a of the adjacent battery cell 100. The first sidewall 100a is the sidewall with the largest area in the battery cell 100. The thickness direction of the harmonica plate 1 is the normal direction of the first sidewall 100a.

[0154] The cold plate assembly 101 includes two harmonica tube plates 1 and a buffer member 2. The two harmonica tube plates 1 are spaced apart along the height direction of the harmonica tube plates 1. Each harmonica tube plate 1 defines three or more flow channels 10. Each flow channel 10 extends along the length direction of the harmonica tube plate 1. The first sidewall 100a is thermally connected to the thickness side of each harmonica tube plate 1 of the cold plate assembly 101. In the height direction of the harmonica tube plates 1, the two ends of the cold plate assembly 101 do not exceed the first sidewall 100a. In the height direction of the harmonica tube plates 1, the buffer member 2 is disposed between the two harmonica tube plates 1 to fill the gap between the two harmonica tube plates 1. The buffer member 2 is opposite to the middle position of the battery cell 100 in the height direction of the harmonica tube plates 1. The buffer member 2 abuts against the first sidewall 100a of the adjacent battery cell 100. The buffer member 2 is a heat insulation material.

[0155] Multiple flow channels 10 are arranged sequentially along the height direction of the harmonica tube plate 1. The cold plate assembly 101 also includes a first sealing element 3. Among the multiple flow channels 10, the outermost flow channel 10 in the height direction of the harmonica tube plate 1 is the first flow channel 10a. There are two first flow channels 10a. The two first flow channels 10a are respectively provided with first sealing elements 3 at both ends along the length direction of the harmonica tube plate 1 to block the first flow channel 10a and avoid at least a part of the other flow channels 10. The cold plate assembly 101 also includes a collector 4. Each harmonica tube plate 1 is provided with a collector 4 at both ends along its length. The collector 4 forms a collection space 40 that communicates with at least two flow channels 10. The collector 4 forms an inlet 40a and an outlet 40b for the heat exchange medium to flow into and out of the collection space 40.

[0156] In the above technical solution, the heat of the battery cell 100 can be distributed and transferred to multiple harmonica tube plates 1 of the cold plate assembly 101, which is beneficial for the battery cell 100 to perform its function. At the same time, it is beneficial to reduce the requirements for heat exchange efficiency between a single harmonica tube plate 1 and the battery cell 100, improve the stress concentration problem between the first sidewall 100a and the cold plate assembly 101, and reduce the heat transfer influence between adjacent battery cells 100. In addition, it is beneficial to reduce the height of a single harmonica tube plate 1, thereby reducing the processing difficulty of the harmonica tube plate 1, improving the processing convenience, and thus improving the yield of the cold plate assembly 101 and the reliability of the battery 200.

[0157] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0158] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, The assembly includes a battery cell and a cold plate assembly, wherein the cold plate assembly abuts against a first sidewall of the battery cell, the first sidewall being the sidewall with the largest area in the battery cell, and the cold plate assembly includes: Multiple harmonica tube plates are spaced apart along the height direction of the harmonica tube plates. Each harmonica tube plate defines at least one flow channel extending along the length direction of the harmonica tube plate. The first sidewall is thermally connected to the thickness side of each harmonica tube plate of the cold plate assembly.

2. The battery according to claim 1, characterized in that, The cold plate assembly also includes: A buffer is provided between any two adjacent harmonica tubes in the height direction of the harmonica tubes to fill the gap between the two adjacent harmonica tubes. The buffer abuts against the first sidewall of the battery cell.

3. The battery according to claim 2, characterized in that, The battery cell is positioned at the center of the harmonica slab in the height direction and is positioned opposite one of the buffer members in the thickness direction of the harmonica slab.

4. The battery according to claim 2 or 3, characterized in that, The buffer component is made of heat-insulating material.

5. The battery according to any one of claims 1-4, characterized in that, In the height direction of the harmonica tube, both ends of the cold plate assembly do not exceed the first sidewall.

6. The battery according to any one of claims 1-5, characterized in that, The individual battery cell is positioned at the center of the harmonica slab along its height direction, offset from each harmonica slab along its height direction; or... The plurality of harmonica plates include a first harmonica plate and at least one second harmonica plate. The battery cell is disposed at the middle position of the harmonica plate in the height direction opposite to the first harmonica plate in the thickness direction, and is offset from the second harmonica plate in the height direction. The stiffness of the first harmonica plate is less than that of the second harmonica plate.

7. The battery according to any one of claims 1-6, characterized in that, The flow channels are three or more, and the outermost flow channel in the height direction of the harmonica slab is the first flow channel, and there are at least two first flow channels. The cold plate assembly also includes: The first sealing element is provided at both ends of each of the first flow channels along the length direction of the harmonica tube plate, so as to block the first flow channel and avoid at least a portion of the other flow channels besides the first flow channel.

8. The battery according to claim 7, characterized in that, The multiple first sealing elements at the same end of the multiple first flow channels along the length direction of the harmonica tube plate are either integral or separate components.

9. The battery according to any one of claims 1-8, characterized in that, The flow channels are multiple, and the cold plate assembly further includes: The harmonica tube sheet has a collector at both ends of its length. The collector has a collection space that communicates with at least two of the flow channels. The collector has an inlet and an outlet for the heat exchange medium to flow into and out of the collection space.

10. The battery according to claim 9, characterized in that, A portion of each of the two current collectors at the same end of the length of two adjacent harmonica tubes is a single piece, and the outlet of one of the two current collectors is connected to the inlet of the other.

11. The battery according to claim 10, characterized in that, The components formed by the two current collectors at the same end of the length of the two adjacent harmonica tubes include: A first manifold body and a second sealing element are provided. The first manifold body is a single piece and defines a first cavity. The first cavity is open at both ends in the height direction of the harmonica tube. The open end of the first cavity is provided with the second sealing element. A plurality of spaced-apart first insertion ports are formed on the side wall of the first cavity. The harmonica tube is inserted into the corresponding first insertion port; or... The second collector body and the third sealing member are a single piece, and a second cavity is defined inside the second collector body. The second cavity is closed at both ends in the height direction of the harmonica tube. A fitting groove is formed on the side wall of the second cavity. The third sealing member is provided at the fitting groove and divides the fitting groove into a plurality of spaced second fitting ports. The harmonica tube is inserted into the corresponding second fitting port.

12. The battery according to claim 10, characterized in that, The current collector and the battery cell are staggered along the length of the harmonica tube sheet. There are an even number of harmonica tube sheets. Two adjacent harmonica tube sheets form a tube sheet group. There are multiple tube sheet groups. The two ends of the length of each tube sheet group are a first end and a second end, respectively. Part of the two current collectors at the first end of each tube sheet group is a single piece with a dimension of t1 along the length of the harmonica tube sheet. The two current collectors at the second end of each tube sheet group are separate pieces with a dimension of t2 along the length of the harmonica tube sheet, where t1 < t2.

13. The battery according to claim 9, characterized in that, The two manifolds at the same end of the length of two adjacent harmonica tubes are separate components, and the two manifolds of the harmonica tubes are respectively connected to the inlet pipe and the outlet pipe.

14. The battery according to any one of claims 1-13, characterized in that, The spacing between two adjacent harmonica tubes is greater than or equal to the width of the flow channel in the height direction of the harmonica tube.

15. The battery according to any one of claims 1-14, characterized in that, The battery cells located on the same side of the cold plate assembly in its thickness direction and thermally connected to the cold plate assembly are multiple, and the multiple battery cells are arranged sequentially along the length direction of the harmonica tube plate to form a battery pack.

16. The battery according to claim 15, characterized in that, The battery packs are arranged in multiple rows, and the cold plate assemblies are arranged in multiple alternating rows along the thickness direction of the harmonica tube plate.

17. An electrical appliance, characterized in that, Includes the battery according to any one of claims 1-16.

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