Battery, power utilization device and energy storage device

Abstract

The utility model provides a battery, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery comprises a box body, a battery monomer, a heat exchange side plate and a heat conduction layer, the box body is provided with a containing space, the single battery and the heat exchange side plate are both located in the containing space, the heat exchange side plate is connected with the box body, the heat exchange side plate is provided with a side heat exchange cavity, the single battery is provided with two opposite first faces, two opposite second faces and two opposite third faces, and the area of the first faces is larger than the area of the second faces and the area of the third faces. The heat exchange side plate is opposite to at least one of the second surface and the third surface; the heat conduction layer is at least positioned on the surface of one side, close to the battery monomer, of the heat exchange side plate. According to the battery provided by the invention, the heat exchange reliability of the battery can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, playing a crucial role in promoting energy transformation and sustainable development. Battery technology is a crucial factor in the development of the new energy industry.

[0003] Batteries typically consist of a housing, battery cells, and a heat exchanger, all of which are located within the housing. The heat exchanger regulates the temperature of the battery cells, ensuring they operate at a suitable temperature and improving the battery's thermal stability. In some cases, expansion of the battery cells can squeeze the heat exchanger, causing damage or deformation, and impacting the reliability of the battery's heat exchange. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a battery, an electrical device, and an energy storage device to improve the reliability of battery heat exchange.

[0005] An embodiment of the first aspect of the present application provides a battery, comprising a housing, a battery cell, a heat exchange side plate, and a heat conductive layer. The housing has a storage space, the battery cell and the heat exchange side plate are both located within the storage space, the heat exchange side plate is connected to the housing, the heat exchange side plate has a side heat exchange cavity, the battery cell has two opposing first surfaces, two opposing second surfaces, and two opposing third surfaces, the area of ​​each first surface is greater than the area of ​​each second surface and the area of ​​each third surface, the heat exchange side plate is opposite to at least one of the second and third surfaces, and the heat conductive layer is located on at least one surface of the heat exchange side plate that is adjacent to the battery cell.

[0006] In the technical solution of the embodiment of the present application, since the first surface has the largest area compared to the second and third surfaces of the battery cell, the first surface is the location where the battery cell expands the most and is subject to greater stress. The heat exchange side plate is arranged in contact with the second and / or third surfaces of the battery cell. Even if the battery cell expands, the heat exchange side plate is not easily damaged, reducing the risk of deformation or damage to the heat exchange side plate due to expansion force, thereby reducing the impact on the heat exchange effect of the battery cell and improving the reliability of the battery heat exchange. The heat conductive layer facilitates closer distance between the heat exchange side plate and the battery cell, facilitating heat exchange between the battery cell and the heat exchange side plate, improving heat exchange efficiency and heat exchange effect. At the same time, the heat conductive layer can also have a certain buffering capacity, capable of absorbing part of the expansion of the battery cell, reducing the squeezing effect of the expansion on the side heat exchange cavity in the heat exchange side plate, maintaining a relatively stable heat exchange effect of the heat exchange side plate on the battery cell, and improving the reliability of the battery.

[0007] In some embodiments, the housing includes a main body and a heat exchange bottom plate. The main body includes a bottom wall and side walls, which form a storage space. The heat exchange bottom plate is located within the storage space. The heat exchange bottom plate is connected to the main body so that the storage space is divided into a mounting cavity and a bottom heat exchange cavity. The battery cells and heat exchange side plates are both located in the mounting cavity. The heat exchange side plates are opposite to one of the second and third surfaces, and the heat exchange bottom plate is opposite to the other of the second and third surfaces. By providing the heat exchange bottom plate and heat exchange side plates, the side heat exchange cavity and the bottom heat exchange cavity can be used simultaneously to exchange heat on different surfaces of the battery cells, thereby improving the heat exchange efficiency of the battery cells.

[0008] In some embodiments, the side heat exchange plate facing the bottom heat exchange plate has a side communication hole, which communicates with the side heat exchange cavity. The side heat exchange cavity facing the side heat exchange plate has a bottom communication hole, which communicates with the bottom heat exchange cavity. The side communication hole communicates with the bottom communication hole. The side heat exchange cavity and the bottom heat exchange cavity are connected, allowing heat exchange medium to be transferred between the side heat exchange cavity and the bottom heat exchange cavity, maintaining temperature consistency between the side heat exchange plate and the bottom heat exchange plate, thereby improving heat exchange uniformity and heat exchange efficiency among the battery cells.

[0009] In some embodiments, the heat exchange side plate includes a side heat exchange plate and a side current collector. The side heat exchange cavity is located in the side heat exchange plate, which is opposite to one of the second and third surfaces. The side current collector is connected to the heat exchange bottom plate. The side current collector is located on at least one side of the side heat exchange plate in a direction parallel to the plate surface of the side heat exchange plate. At least one end of the side heat exchange plate is connected to the side current collector. The side communication hole is located in the side current collector, and the side current collector has a side communication channel that is connected to both the side heat exchange cavity and the side communication hole. This allows the heat exchange medium to accumulate in the side current collector and be evenly dispersed in the side heat exchange cavity, thereby improving the uniformity of the heat exchange between the heat exchange side plate and the battery cells.

[0010] In some embodiments, a side current collector has a flow guide groove on its surface facing the side heat exchange plate. A side communication channel extends through the side of the flow guide groove. At least one end of the side heat exchange plate is located within the flow guide groove. A side heat exchange cavity extends through the end surface of the side heat exchange plate facing the flow guide groove. This facilitates insertion of the side heat exchange plate into the flow guide groove and connection with the side current collector, improving the strength of the connection. Furthermore, the sufficiently large cross-sectional area of ​​the side heat exchange cavity facilitates rapid transport of heat exchange medium accumulated in the flow guide groove into the side heat exchange cavity, thereby improving the heat exchange efficiency of the battery cells.

[0011] In some embodiments, the bottom surface of the flow guide trough is provided with a limit block, and the side heat exchange plate abuts against the limit block. The limit block can prevent the side heat exchange plate from fully contacting the bottom surface of the flow guide trough, thereby forming a space for the heat exchange medium to pass between the side heat exchange plate and the bottom surface of the flow guide trough, improving the transport efficiency of the heat exchange medium and thus improving the heat exchange efficiency of the battery cells.

[0012] In some embodiments, the heat exchange bottom plate includes a bottom heat exchange plate and a bottom current collector. The bottom heat exchange plate is connected to the body and is located between the bottom heat exchange cavity and the mounting cavity. The bottom heat exchange plate is opposite to the other of the second and third surfaces, and the bottom connecting hole is located in the bottom heat exchange plate. The bottom current collector is connected to a side surface of the bottom heat exchange plate facing the heat exchange side plate. The bottom current collector has a bottom connecting channel, a first connecting hole, and a second connecting hole. The first connecting hole and the second connecting hole are both connected to the bottom connecting channel. The first connecting hole is connected to the bottom connecting hole, and the second connecting hole is connected to the side connecting hole. This allows the heat exchange medium to be accumulated in the bottom current collector and then evenly transferred to the side heat exchange cavity of the heat exchange side plate, thereby improving the uniformity of heat exchange between the different heat exchange side plates and the side of the battery cell, thereby improving the heat exchange efficiency.

[0013] In some embodiments, when the heat exchange side plate includes a side current collector, a mounting block is provided on a surface of the bottom current collector facing the side current collector, the second communication hole extends through the mounting block, and one end of the side current collector is located within the mounting block. The battery further includes a first sealing ring located between the side current collector and the mounting block. The connection between the side current collector and the mounting block can increase the contact area between the side current collector and the bottom current collector, improving the connection strength between the two. Furthermore, the first sealing ring can enhance the sealing performance of the connection between the side current collector and the mounting block, reducing the risk of heat exchange medium overflowing or leaking from the connection.

[0014] In some embodiments, the outer wall of the side current collector has a mounting groove that surrounds the outer wall of the side current collector and is adjacent to the mounting block. The outer wall of the mounting block has a locking groove. The battery further includes a sealing nest that is fitted over the side current collector and the mounting block. A portion of the sealing nest is located within the mounting groove, and the end of the sealing nest that faces the heat exchange base plate has a locking barb located within the locking groove. The sealing nest can achieve a self-locking function, which helps to fix the relative position between the side current collector and the mounting block, reduces the possibility of the side current collector shaking at the mounting block, improves the stability of the connection between the two, and simplifies the connection between the side current collector and the mounting block.

[0015] In some embodiments, the locking groove surrounds the outer side wall of the mounting block. The locking barbs can contact the locking groove at all points along the circumference of the mounting block, increasing the contact area between the locking barbs and the mounting block, thereby improving the connection strength between the side current collector and the mounting block and enhancing battery reliability.

[0016] In some embodiments, the end of the sealing nest facing the heat exchange base plate has a plurality of spaced expansion notches. The expansion notches can enhance the deformability of the end of the sealing nest facing the heat exchange base plate, facilitate installation of the sealing nest on the mounting block, and improve battery assembly efficiency.

[0017] In some embodiments, the end surface of the sealing nest facing the heat exchange base plate has multiple side edges, each with at least one expansion notch. This allows each side of the sealing nest with an expansion notch to easily undergo elastic deformation, increasing the degree of deformability of the side edges of the sealing nest, facilitating installation of the sealing nest on the mounting block, and improving battery assembly efficiency.

[0018] In some embodiments, the battery further includes a second sealing ring positioned within the mounting groove, surrounding the side current collector, and in contact with the mounting block and the sealing nest. The second sealing ring can improve the sealing between the sealing nest, the side current collector, and the mounting block, thereby enhancing the sealing effect at the connection between the mounting block and the side current collector.

[0019] An embodiment of the second aspect of the present application provides an electrical device, which includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0020] An embodiment of the third aspect of the present application provides an energy storage device, which includes the battery in the above embodiment, and the battery is used to store electrical energy.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0023] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0024] Figure 2 A schematic diagram of the structure of a battery in some embodiments of the present application;

[0025] Figure 3 This is a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0026] Figure 4 This is one of the partial structural schematic diagrams of batteries according to some embodiments of the present application;

[0027] Figure 5 A schematic cross-sectional view of the assembly of a heat exchange side plate and a bottom current collector in some embodiments of the present application;

[0028] Figure 6 This is a schematic diagram of the exploded structure of the heat exchange side plate and the bottom current collector in some embodiments of the present application;

[0029] Figure 7 A bottom view of a side current collector according to some embodiments of the present application;

[0030] Figure 8 A side view of a side current collector according to some embodiments of the present application;

[0031] Figure 9 This is a schematic structural diagram of the bottom heat exchange plate of some embodiments of the present application;

[0032] Figure 10 This is a schematic structural diagram of the bottom current collector of some embodiments of the present application;

[0033] Figure 11 A bottom view of a bottom current collector according to some embodiments of the present application;

[0034] Figure 12 for Figure 4 A partial enlarged view of the cross-section of the middle AA surface;

[0035] Figure 13 This is a front view of a bottom current collector according to some embodiments of the present application;

[0036] Figure 14 for Figure 13A partial enlarged view of the middle E part;

[0037] Figure 15 A front view of a sealing nest according to some embodiments of the present application;

[0038] Figure 16 This is an assembly diagram of the heat-conducting layer and the heat-exchange side plate of some embodiments of the present application;

[0039] Figure 17 This is the second schematic diagram of the partial structure of the battery of some embodiments of the present application.

[0040] Description of reference numerals:

[0041] 1000, vehicle; 1001, battery; 1002, controller; 1003, motor; 10, housing; 10a, storage space; 10b, bottom heat exchange chamber; 11, body; 111, bottom wall; 112, side wall; 20, battery cell; 21, end cap; 21a, electrode terminal; 22, housing; 23, electrode assembly; 23a, tab; 30, heat exchange bottom plate; 31, bottom heat exchange plate; 311, bottom connecting hole; 32, bottom current collector; 321, first connecting hole; 322, second connecting hole; 323, mounting block; 3231 , locking groove; 324, bottom fluid collector end cover; 325, bottom connecting channel; 40, connecting pipe; 50, sealing flange; 60, heat exchange side plate; 60a, side heat exchange cavity; 61, side heat exchange plate; 62, side fluid collector; 621, guide groove; 6211, limit block; 622, side connecting hole; 623, side connecting channel; 624, mounting groove; 70, first sealing ring; 80, sealing nest; 81, locking hook; 82, expansion notch; 90, second sealing ring; 100, heat conductive layer; 110, bottom guard plate; 120, buffer layer. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0050] Currently, market developments indicate that rechargeable batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in various electronic devices, including electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, market demand is also growing.

[0051] Batteries typically consist of a housing, battery cells, and a heat exchanger, all of which are located within the housing. The heat exchanger regulates the temperature of the battery cells, allowing them to operate at a suitable temperature and improving the battery's thermal stability. In some cases, such as when a battery cell reaches a certain lifespan during its charge-discharge cycle, gassing may occur within the cell, causing the cell surface to swell. This can easily compress the heat exchanger, causing it to deform or damage, impacting the battery's heat exchange efficiency and reliability.

[0052] Based on the above considerations, the present application designs a battery comprising a housing, a battery cell, a heat exchange side plate, and a heat conductive layer. The housing has a storage space, within which the battery cell and the heat exchange side plate are located. The heat exchange side plate is connected to the housing and has a side heat exchange cavity. The battery cell has two opposing first surfaces, two opposing second surfaces, and two opposing third surfaces, wherein the area of ​​each first surface is greater than that of both the second and third surfaces. The heat exchange side plate is opposed to at least one of the second and third surfaces. The heat conductive layer is located on at least one surface of the heat exchange side plate that is adjacent to the battery cell.

[0053] Compared to the second and third sides of the battery cell, the first side has the largest area and is therefore the location where the battery cell expands the most, resulting in greater stress. Providing a heat exchange side plate in contact with the second and / or third sides of the battery cell prevents damage to the heat exchange side plate even if the battery cell expands, reducing the risk of deformation or damage to the heat exchange side plate due to expansion forces. This, in turn, minimizes the impact on the heat exchange performance of the battery cell and improves the reliability of the battery heat exchange. The heat conductive layer has a certain buffering capacity, which can absorb some of the battery cell expansion, reducing the squeezing effect of expansion on the side heat exchange cavity in the heat exchange side plate, maintaining a relatively stable heat exchange performance for the battery cell, and improving battery reliability.

[0054] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices or energy storage devices such as vehicles, ships, or aircraft. A power supply system comprising the battery disclosed in this application can be formed into the electrical device or energy storage device.

[0055] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0056] An embodiment of the present application also provides an energy storage device that uses a battery as a power source. The energy storage device may be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0057] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0058] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided for some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1001 is provided inside the vehicle 1000, and the battery 1001 can be provided at the bottom, head or tail of the vehicle 1000. The battery 1001 can be used to power the vehicle 1000. For example, the battery 1001 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1002 and a motor 1003. The controller 1002 is used to control the battery 1001 to power the motor 1003, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0059] In some embodiments of the present application, the battery 1001 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Figure 2 This is a schematic diagram of the structure of the battery of some embodiments of the present application, see Figure 2 An embodiment of the present application provides a battery, including a box body 10, a battery cell 20 and a heat exchange side plate 60. Figure 3 This is a schematic diagram of the exploded structure of a battery cell in some embodiments of the present application. Figure 4 This is one of the partial structural diagrams of batteries in some embodiments of the present application. Figure 5 This is a cross-sectional schematic diagram of the assembly of the heat exchange side plate and the bottom current collector in some embodiments of the present application. Figures 2 to 5The box body 10 has a accommodating space 10a, the battery cell 20 and the heat exchange side plate 60 are both located in the accommodating space 10a, the heat exchange side plate 60 is connected to the box body 10, the heat exchange side plate 60 has a side heat exchange cavity 60a, the battery cell 20 has two opposite first surfaces, two opposite second surfaces and two opposite third surfaces, the area of ​​the first surface is larger than the area of ​​the second surface and the area of ​​the third surface, and the heat exchange side plate 60 is opposite to at least one of the second surface and the third surface.

[0061] See also Figure 4 The battery further includes a heat-conducting layer 100 , which is located at least on a surface of the heat-exchange side plate 60 close to the battery cell 20 .

[0062] The constituent materials of the heat conducting layer 100 include but are not limited to silicone rubber, polyurethane, acrylic, epoxy resin, graphene, etc.

[0063] The heat conducting layer 100 may be connected to the surface of the heat exchanging side plate 60 by bonding.

[0064] In the embodiment of the present application, when both opposing surfaces of the heat exchange side plate 60 are opposite to the battery cells 20, both opposing surfaces of the heat exchange side plate 60 have heat conductive layers 100. When one surface of the heat exchange side plate 60 is opposite to the battery cells 20, one surface of the heat exchange side plate 60 has heat conductive layers 100, or both opposing surfaces of the heat exchange side plate 60 have heat conductive layers 100.

[0065] Exemplarily, the thermal conductive layer 100 is attached to the battery cell 20 .

[0066] In the embodiment of the present application, the shape of the accommodation space 10a can be various. The shape of the accommodation space 10a can be a cylinder or a rectangular parallelepiped, etc. The shape of the accommodation space 10a is not limited thereto.

[0067] In the battery 1001, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 1001 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a single unit housed within the housing 10. The battery 1001 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0068] Battery cell 20 is the smallest unit that makes up battery 1001. Battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. Battery cell 20 can be cylindrical, flat, rectangular, or in other shapes.

[0069] See also Figure 3 The battery cell 20 includes an end cap 21, an electrode terminal 21a, a housing 22, an electrode assembly 23 and other functional components.

[0070] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of the end cap 21, and the insulating member can be used to isolate the electrical connection components in the shell 22 from the end cap 21 to reduce the risk of short circuit.

[0071] The housing 22 is a component used to cooperate with the end cap 21 to form an internal environment of the battery cell 20 , wherein the formed internal environment can be used to accommodate the electrode assembly 23 , electrolyte and other components.

[0072] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 23a. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1001, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs 23a connect the electrode terminals to form a current loop.

[0073] In some embodiments, the first surface, the second surface, and the third surface are perpendicular to each other.

[0074] In some embodiments, the connection method between the heat exchange side plate 60 and the box body 10 includes but is not limited to bonding connection, welding connection or bolt connection.

[0075] The number of side heat exchange cavities 60a in the heat exchange side plate 60 may be one or more. For example, the multiple side heat exchange cavities 60a may extend along the length of the side heat exchange plate 61, or may be spaced apart along the width of the side heat exchange plate 61. The number of side heat exchange cavities 60a may be eight.

[0076] The heat exchange side plate 60 may be opposite to the second surface only; or, the heat exchange side plate 60 may be opposite to the third surface only; or, the heat exchange side plate 60 may be opposite to both the second surface and the third surface.

[0077] In some embodiments, the heat exchange side plates 60 may be spaced apart along the length or width direction of the housing 10. In some embodiments, the number of the heat exchange side plates 60 may be five, and the five heat exchange side plates 60 may be spaced apart along the width direction of the housing 10.

[0078] In the embodiments of the present application, the heat exchange side plates 60 can exchange heat with the battery cells 20 and regulate the temperature of the battery cells 20. For example, when the temperature of the battery cells 20 is high, a lower-temperature heat exchange medium is injected into the side heat exchange cavity 60a. The heat exchange medium absorbs heat from the battery cells 20 through the heat exchange side plates 60, lowering the temperature of the battery cells 20. When the temperature of the battery cells 20 is low, a higher-temperature heat exchange medium is injected into the side heat exchange cavity 60a. The heat exchange medium transfers heat to the battery cells 20 through the heat exchange side plates 60, thereby raising the temperature of the battery cells 20. The heat exchange side plates 60 can ensure that the battery cells 20 operate at an appropriate temperature, improving the stability of the battery 1001. The heat-conducting layer 100 is conducive to making the distance between the heat-exchange side plate 60 and the battery cell 20 closer, facilitating heat exchange between the battery cell 20 and the heat-exchange side plate 60, and improving the heat-exchange efficiency and heat-exchange effect. At the same time, the heat-conducting layer 100 can also have a certain buffering capacity, which can absorb part of the expansion of the battery cell 20, reduce the squeezing effect of the expansion on the side heat-exchange cavity 60a in the heat-exchange side plate 60, maintain the heat-exchange effect of the heat-exchange side plate 60 on the battery cell 20 relatively stable, and improve the reliability of the battery 1001.

[0079] In some embodiments of the present application, the battery 1001 may further include a connecting pipe 40. The housing 10 may also be provided with a heat exchange through-hole. The connecting pipe 40 communicates with the side heat exchange cavity 60a through the heat exchange through-hole, thereby allowing heat exchange medium to be input or output into or out of the side heat exchange cavity 60a through the connecting pipe 40. In this manner, while maintaining the housing 10 in a sealed state, the heat exchange medium in the side heat exchange cavity 60a can be replenished or adjusted at any time through the connecting pipe 40, providing a simple and quick operation.

[0080] In some embodiments of the present application, the battery 1001 may further include a sealing flange 50. The sealing flange 50 is disposed around the connecting pipe 40 and the heat exchange through-hole. The sealing flange 50 may be in contact with the outer wall of the housing 10. The sealing flange 50 is used to connect the connecting pipe 40 and the housing 10. The sealing flange 50 can secure the connecting pipe 40 to the heat exchange through-hole, reducing the possibility of the connecting pipe 40 shaking or shifting at the heat exchange through-hole. At the same time, the sealing flange 50 can also seal the gap therein, reducing the risk of moisture or impurities outside the housing 10 entering the interior of the housing 10 through the gap, thereby improving the reliability of the battery 1001.

[0081] In the embodiment of the present application, compared with the second and third surfaces of the battery cell 20, since the first surface has the largest area, the first surface is the position where the battery cell 20 expands the most, and there is greater stress. The heat exchange side plate 60 is provided in contact with the second and / or third surfaces of the battery cell 20. Even if the battery cell 20 expands, it is not easy to damage the heat exchange side plate 60, reducing the risk of deformation or damage of the heat exchange side plate 60 due to the expansion force, thereby reducing the impact on the heat exchange effect of the battery cell 20 and improving the reliability of the battery heat exchange.

[0082] In related art, heat is exchanged from the sides of battery cells 20 using harmonica tube plates. This occupies a relatively large volume of the accommodation space 10a, resulting in a low energy density of battery 1001. However, in the present embodiment, the inherent gaps between each group of battery cells 20 are utilized, and heat exchange side plates 60 are positioned in these gaps to exchange heat from the sides of the battery cells 20. This eliminates the need for the heat exchange side plates 60 to occupy excessive space, thereby improving the overall energy density of battery 1001.

[0083] See also Figure 2 and Figure 4 According to some embodiments of the present application, the housing 10 includes a body 11 and a heat exchange bottom plate 30. The body 11 includes a bottom wall 111 and side walls 112. The bottom wall 111 and the side walls 112 form a receiving space 10a. The heat exchange bottom plate 30 is located in the receiving space 10a. The heat exchange bottom plate 30 is connected to the body 11 so that the receiving space 10a is divided into an installation cavity and a bottom heat exchange cavity 10b. The battery cells 20 and the heat exchange side plate 60 are both located in the installation cavity; wherein the heat exchange side plate 60 is opposite to one of the second surface and the third surface, and the heat exchange bottom plate 30 is opposite to the other of the second surface and the third surface.

[0084] In the embodiment of the present application, the body 11 is surrounded by a side wall 112 and a bottom wall 111. In some embodiments, the side wall 112 may be a hollow structure with one end open, for example, the side wall 112 may be a cylinder or a cuboid with one end open, and the bottom wall 111 covers the open end of the side wall 112. In other embodiments, see Figure 2 and Figure 4 The side wall 112 may be a hollow structure with openings at both ends, and the body 11 may further include a top wall ( Figure 2 and Figure 4 (not shown), the top wall and the bottom wall 111 respectively cover the two open ends of the side wall 112.

[0085] In the embodiment of the present application, the bottom wall 111 may be a flat or curved plate-like structure, etc., and the embodiment of the present application does not limit this.

[0086] In some embodiments of the present application, a surface of the bottom wall 111 that is away from the accommodating space 10 a may be a concave-convex surface.

[0087] In some embodiments, the material of the body 11 includes, but is not limited to, non-metallic materials such as polypropylene, nylon, polyvinyl chloride, carbon fiber composite materials, and acrylonitrile-butadiene-styrene terpolymer.

[0088] In other embodiments, the material of the body 11 includes, but is not limited to, metal materials such as stainless steel, aluminum alloy, and aluminum. For example, the material of the body 11 may be AL3003, which is an aluminum-manganese alloy.

[0089] In the embodiment of the present application, the side wall 112 and the bottom wall 111 can be connected in various ways. For example, the side wall 112 and the bottom wall 111 can be connected by welding, or the side wall 112 and the bottom wall 111 can also be connected by bonding. The side wall 112 and the bottom wall 111 can also be integrally formed.

[0090] In some embodiments of the present application, the material of the side wall 112 and the material of the bottom wall 111 can be the same, for example, the material of the side wall 112 and the material of the bottom wall 111 are both metal. In other embodiments of the present application, the material of the side wall 112 and the material of the bottom wall 111 can be different.

[0091] In some embodiments, the body 11 can be formed by a stamping process. For example, a suitable sheet material is selected and placed between a male and female die. The edges of the sheet material are fixed, and the male die presses the sheet material into the female die, thereby forming a box-shaped structure with side walls 112 and a bottom wall 111. The body 11 is then formed through subsequent processes such as trimming, flanging, and deburring.

[0092] In some embodiments, one side surface of the heat exchange bottom plate 30 contacts the bottom wall 111 of the body 11 , and the other side surface contacts the battery cells 20 and the heat exchange side plate 60 .

[0093] The surface of the heat exchange bottom plate 30 facing the battery cell 20 may be a flat surface or an uneven surface.

[0094] In some embodiments, the heat exchange bottom plate 30 is made of materials including, but not limited to, stainless steel, aluminum alloy, aluminum, and other metal materials. For example, the heat exchange bottom plate 30 may be made of AL3003.

[0095] The heat exchange base plate 30 can be a flat plate. During processing, the heat exchange base plate 30 can be produced through a non-deformation process. After processing, the heat exchange base plate 30 is free of residual stress. A non-deformation process means that the material undergoes no macroscopic or microscopic deformation through process control. Residual stress-free means that no invisible stress remains within the material after processing.

[0096] In some embodiments, the heat exchange base plate 30 and the body 11 are connected by bonding, welding, or bolting. For example, the heat exchange base plate 30 and the body 11 can be connected by brazing. The heat exchange base plate 30 can be connected to the bottom wall 111 of the body 11, or the heat exchange base plate 30 can be connected to both the bottom wall 111 and the side wall 112 of the body 11.

[0097] This application does not limit the shape and size of the bottom heat exchange cavity 10b.

[0098] When the heat exchange side plate 60 is opposite to the second surface, the heat exchange bottom plate 30 is opposite to the third surface; when the heat exchange side plate 60 is opposite to the third surface, the heat exchange bottom plate 30 is opposite to the second surface.

[0099] The heat exchange side plate 60 may be perpendicular to the heat exchange bottom plate 30 .

[0100] In some embodiments, the heat exchange base plate 30 may be a water-cooled plate.

[0101] In the embodiment of the present application, by providing a heat exchange bottom plate 30 and a heat exchange side plate 60 , the side heat exchange cavity 60a and the bottom heat exchange cavity 10b can be used simultaneously to exchange heat on different surfaces of the battery cell 20 , thereby improving the heat exchange efficiency of the battery cell 20 .

[0102] According to some embodiments of the present application, the side of the heat exchange side plate 60 facing the heat exchange bottom plate 30 has a side connecting hole 622, and the side connecting hole 622 is connected to the side heat exchange cavity 60a. The side of the heat exchange bottom plate 30 facing the heat exchange side plate 60 has a bottom connecting hole 311, and the bottom connecting hole 311 is connected to the bottom heat exchange cavity 10b. The side connecting hole 622 is connected to the bottom connecting hole 311.

[0103] That is, the side heat exchange chamber 60a and the bottom heat exchange chamber 10b are communicated.

[0104] In some embodiments, the heat exchange side plate 60 and the heat exchange bottom plate 30 are in contact and connected, and the connection method between the heat exchange side plate 60 and the heat exchange bottom plate 30 includes but is not limited to welding connection, adhesive connection, riveting connection, snap connection or bolt connection.

[0105] In some embodiments, the bottom communicating hole 311 may be formed by laser cutting, blanking, or the like.

[0106] In some embodiments, the side communication hole 622 may also be formed by laser cutting, blanking, or the like.

[0107] In the embodiment of the present application, the side heat exchange chamber 60a and the bottom heat exchange chamber 10b are connected, so that the heat exchange medium can be transferred between the side heat exchange chamber 60a and the bottom heat exchange chamber 10b, maintaining the temperature consistency of the heat exchange side plate 60 and the heat exchange bottom plate 30, thereby improving the heat exchange uniformity of the battery cell 20 and improving the heat exchange efficiency.

[0108] Figure 6 This is a schematic diagram of the exploded structure of the heat exchange side plate and the bottom current collector in some embodiments of the present application. Figure 7 This is a bottom view of the side current collector of some embodiments of the present application, see Figures 5 to 7 According to some embodiments of the present application, the heat exchange side plate 60 includes a side heat exchange plate 61 and a side fluid collector 62, the side heat exchange cavity 60a is located on the side heat exchange plate 61, and the side heat exchange plate 61 is opposite to one of the second surface and the third surface; the side fluid collector 62 is connected to the heat exchange bottom plate 30, and along the direction parallel to the plate surface of the side heat exchange plate 61, the side fluid collector 62 is located on at least one side of the side heat exchange plate 61, and at least one end of the side heat exchange plate 61 is connected to the side fluid collector 62, and the side connecting hole 622 is located on the side fluid collector 62, and the side fluid collector 62 has a side connecting channel 623, and the side connecting channel 623 is connected to both the side heat exchange cavity 60a and the side connecting hole 622.

[0109] In some embodiments, the inner wall of the side heat exchange plate 61 may be provided with multiple reinforcing ribs to enhance the structural strength and rigidity of the side heat exchange plate 61. The present embodiment does not limit the structure and material of the reinforcing ribs. The reinforcing ribs also separate the multiple side heat exchange cavities 60a, allowing the heat exchange medium to be more evenly distributed within the multiple side heat exchange cavities 60a. This allows the heat exchange medium to more evenly exchange heat with the battery cells 20, thereby improving heat exchange efficiency.

[0110] The side heat exchange plate 61 may be made of a metal material, such as an aluminum alloy. For example, the side heat exchange plate 61 may be made of AL3003. In some embodiments, the side heat exchange plate 61 may be manufactured by an extrusion process.

[0111] The side current collectors 62 may or may not be in contact with the battery cells 20 .

[0112] In some embodiments, the plate surface of the side heat exchange plate 61 is parallel to the length direction of the side heat exchange plate 61, and the side current collector 62 may be located on at least one side of the side heat exchange plate 61 along the length direction of the side heat exchange plate 61. For example, the side current collector 62 may be located on both sides of the side heat exchange plate 61 along the length direction of the side heat exchange plate 61.

[0113] In some embodiments, the side current collector 62 and the side heat exchange plate 61 can be integrally formed or can be two independent structures. The connection between the side current collector 62 and the side heat exchange plate 61 includes but is not limited to welding, bolting, or snap-fit ​​connection.

[0114] The material of the side current collector 62 can be a metal material, such as aluminum alloy. For example, the material of the side current collector 62 can be AL3003. In some embodiments, the side current collector 62 can be manufactured by machining.

[0115] In the embodiment of the present application, the heat exchange medium can be gathered in the side current collector 62 and evenly dispersed in the side heat exchange cavity 60 a , thereby improving the uniformity of heat exchange between the heat exchange side plate 60 and the battery cell 20 .

[0116] Figure 8 For side views of the side current collectors of some embodiments of the present application, see Figure 8 According to some embodiments of the present application, a side surface of the side collector 62 facing the side heat exchange plate 61 has a guide groove 621, the side connecting channel 623 passes through the side of the guide groove 621, at least one end of the side heat exchange plate 61 is located in the guide groove 621, and the side heat exchange cavity 60a passes through the end surface of the side heat exchange plate 61 facing the guide groove 621.

[0117] It is understood that the side surface of the side current collector 62 facing the side heat exchange plate 61 has an opening, and at least one end of the side heat exchange plate 61 extends into the opening to be located in the guide groove 621. In some embodiments, the side heat exchange plate 61 can be connected to the guide groove 621 by laser welding.

[0118] The opening shape of the guide groove 621 can be adapted to the cross-sectional shape of the side heat exchange plate 61. For example, the opening shape of the guide groove 621 can be rectangular, and the cross-sectional shape of the side heat exchange plate 61 can also be rectangular.

[0119] The heat exchange bottom plate 30 may be perpendicular to the guide groove 621. The guide groove 621 communicates the side heat exchange chamber 60a and the bottom heat exchange chamber 10b.

[0120] In the embodiment of the present application, the side heat exchange plate 61 is easily inserted into the guide groove 621 and connected to the side current collector 62, which can improve the connection strength between the two. At the same time, the cross-sectional area of ​​the side heat exchange cavity 60a is large enough, which is conducive to quickly transporting the heat exchange medium accumulated in the guide groove 621 to the side heat exchange cavity 60a, thereby improving the heat exchange efficiency of the battery cell 20.

[0121] In related art, heat is exchanged from the sides of battery cells 20 via harmonica tube plates. The current collectors at each end of the harmonica tube plates feature specially shaped nozzles, which necessitates high manufacturing requirements and high machining costs. Furthermore, harmonica tube plates typically come in sets, requiring at least three different styles for a single battery 1001, resulting in high mold costs. In contrast, in the embodiment of the present application, the side current collectors 62 at each end of the side heat exchange plate 61 feature flow guide grooves 621, simplifying part processing and reducing machining costs. Furthermore, the heat exchange side plate 60 only has one shape, reducing mold costs.

[0122] According to some embodiments of the present application, a bottom surface of the guide groove 621 is provided with a limit block 6211 , and the side heat exchange plate 61 abuts against the limit block 6211 .

[0123] The embodiment of the present application does not limit the shape of the limit block 6211. The limit block 6211 may be in any three-dimensional structure. For example, the limit block 6211 may be in the shape of a cuboid.

[0124] It can be understood that due to the existence of the limit block 6211, the side heat exchange plate 61 cannot contact the bottom surface of the guide groove 621, so that a certain distance can be formed between the side heat exchange plate 61 and the bottom surface of the guide groove 621.

[0125] In some embodiments, the number of the limiting blocks 6211 may be four, and the four limiting blocks 6211 may be located at the edge of the guide groove 621. The limiting blocks 6211 may also contact the side surfaces of the guide groove 621.

[0126] In an embodiment of the present application, the limit block 6211 can limit the side heat exchange plate 61 from being completely in contact with the bottom surface of the guide groove 621, thereby forming a space for the heat exchange medium to pass through between the side heat exchange plate 61 and the bottom surface of the guide groove 621, thereby improving the transportation efficiency of the heat exchange medium and thus improving the heat exchange efficiency of the battery cell 20.

[0127] Figure 9 This is a schematic diagram of the structure of the bottom heat exchange plate in some embodiments of the present application. Figure 10 This is a schematic structural diagram of the bottom current collector of some embodiments of the present application. Figure 11 This is a bottom view of the bottom current collector of some embodiments of the present application. Figure 12 for Figure 4 A partial enlarged view of the AA section. Figures 9 to 12According to some embodiments of the present application, the heat exchange bottom plate 30 includes a bottom heat exchange plate 31 and a bottom fluid collector 32. The bottom heat exchange plate 31 is connected to the body 11 and is located between the bottom heat exchange cavity 10b and the installation cavity. The bottom heat exchange plate 31 is opposite to the other of the second surface and the third surface. The bottom communicating hole 311 is located on the bottom heat exchange plate 31; the bottom fluid collector 32 is connected to a side surface of the bottom heat exchange plate 31 facing the heat exchange side plate 60, and the bottom fluid collector 32 has a bottom communicating channel 325, a first communicating hole 321, and a second communicating hole 322. The first communicating hole 321 and the second communicating hole 322 are both connected to the bottom communicating channel 325, the first communicating hole 321 is connected to the bottom communicating hole 311, and the second communicating hole 322 is connected to the side communicating hole 622.

[0128] In some embodiments, the bottom heat exchange plate 31 may be a flat plate.

[0129] In some embodiments, the bottom heat exchange plate 31 is made of materials including, but not limited to, stainless steel, aluminum alloy, aluminum, and other metal materials. For example, the bottom heat exchange plate 31 may be made of AL3003.

[0130] The bottom communicating hole 311 may be located at an edge of the bottom heat exchange plate 31 .

[0131] The bottom heat exchange plate 31 is connected to the bottom fluid collector 32 . The bottom fluid collector 32 may be located directly above the bottom communication hole 311 .

[0132] In some embodiments, the bottom heat exchange plate 31 and the bottom current collector 32 are connected to each other, and the connection method of the bottom heat exchange plate 31 and the bottom current collector 32 includes but is not limited to welding connection, adhesive connection or bolt connection, etc. Exemplarily, the bottom heat exchange plate 31 and the bottom current collector 32 are connected by welding.

[0133] In some embodiments, the bottom current collector 32 is made of metal materials including, but not limited to, stainless steel, aluminum alloy, aluminum, etc. For example, the bottom current collector 32 may be made of AL3003 and may be manufactured by an aluminum extrusion process.

[0134] In some embodiments, the first communication hole 321 and the second communication hole 322 may be formed by laser cutting, blanking, or the like.

[0135] The cross-sectional shape of the bottom current collector 32 includes but is not limited to square, circular or other shapes.

[0136] The bottom current collector 32 has a cavity therein to form a bottom communication channel 325 .

[0137] In some embodiments, the first communication hole 321 may be located on a side of the bottom current collector 32 close to the bottom heat exchange plate 31 , and the second communication hole 322 may be located on a side of the bottom current collector 32 away from the bottom heat exchange plate 31 .

[0138] The number of the first communication holes 321 and the number of the second communication holes 322 may be equal or unequal.

[0139] For example, the number of bottom communicating holes 311 may be six, the number of bottom current collectors 32 may be two, each bottom current collector 32 being located directly above three bottom communicating holes 311, the number of first communicating holes 321 may be three, and the first communicating holes 321 correspond one-to-one to the bottom communicating holes 311, and the number of second communicating holes 322 may be five. The number of second communicating holes 322 is the same as the number of heat exchange side plates 60.

[0140] In some embodiments, the shape of the bottom communication hole 311 includes but is not limited to a circle, a triangle, a square or other irregular shapes. For example, the shape of the bottom communication hole 311 is a circle.

[0141] In some embodiments, the shape of the first communication hole 321 includes but is not limited to a circle, a triangle, a square or other irregular shapes. For example, the shape of the first communication hole 321 is a circle.

[0142] In some embodiments, the shape of the second communication hole 322 includes but is not limited to a circle, a triangle, a square or other irregular shapes. For example, the shape of the second communication hole 322 is a square.

[0143] The bottom heat exchange plate 31 is connected to the heat exchange side plate 60 through the bottom fluid collector 32 .

[0144] In some embodiments, the connection method between the bottom current collector 32 and the heat exchange side plate 60 includes but is not limited to welding connection, bolt connection or snap connection.

[0145] The bottom current collector 32 and the heat exchange side plate 60 may be perpendicular to each other or not.

[0146] refer to Figure 7 Battery 1001 may further include a bottom current collector end cap 324, which is mounted on both ends of the bottom current collector 32 to seal the two end openings of the bottom current collector 32. The bottom current collector end cap 324 may be made of, but not limited to, stainless steel, aluminum alloy, aluminum, or other metal materials. For example, the bottom current collector end cap 324 may be made of AL3003 and formed by machining. The bottom current collector end cap 324 may be welded to the bottom current collector 32, such as by brazing.

[0147] In the embodiment of the present application, the heat exchange medium can be gathered in the bottom current collector 32 and then evenly transferred to the side heat exchange cavity 60a of the heat exchange side plate 60, thereby improving the uniformity of heat exchange between different heat exchange side plates 60 on the side of the battery cell 20 and improving the heat exchange efficiency.

[0148] See also Figure 12 According to some embodiments of the present application, when the heat exchange side plate 60 includes a side current collector 62, the bottom current collector 32 has a mounting block 323 on one side surface facing the side current collector 62, the second connecting hole 322 passes through the mounting block 323, and one end of the side current collector 62 is located in the mounting block 323. The battery also includes a first sealing ring 70, which is located between the side current collector 62 and the mounting block 323.

[0149] That is, the mounting block 323 protrudes from the remaining surface of the bottom current collector 32 .

[0150] In some embodiments, the mounting block 323 and the bottom current collector 32 may be integrally formed or may be two independent structures. For example, the mounting block 323 may be connected to the bottom current collector 32 by welding.

[0151] In some embodiments, the maximum outer diameter of one end of the side current collector 62 is smaller than the minimum inner diameter of the second communication hole 322 , so that one end of the side current collector 62 can be inserted into the mounting block 323 to connect with the bottom current collector 32 .

[0152] In some embodiments, an outer surface of one end of the side current collector 62 may have a groove for accommodating the first sealing ring 70 .

[0153] The first sealing ring 70 may be sleeved on the outer surface of the side current collector 62 .

[0154] The first sealing ring 70 may be made of materials including, but not limited to, nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, polytetrafluoroethylene, nylon, polyurethane, silicone, resin, etc. For example, the first sealing ring 70 may be made of ethylene propylene rubber. The first sealing ring 70 may be manufactured by a molding process.

[0155] In the embodiment of the present application, the side current collector 62 is connected to the mounting block 323, which can increase the contact area between the side current collector 62 and the bottom current collector 32 and improve the connection strength between the two. At the same time, the first sealing ring 70 can enhance the sealing performance of the connection between the side current collector 62 and the mounting block 323, reducing the risk of heat exchange medium overflowing or leaking from the connection.

[0156] Figure 13 This is a front view of the bottom current collector of some embodiments of the present application. Figure 14 for Figure 13 A partial enlarged view of the middle E part. Figure 15 This is a front view of a sealing nest according to some embodiments of the present application. Figures 12 to 15According to some embodiments of the present application, the outer wall of the side current collector 62 has a mounting groove 624, the mounting groove 624 surrounds the outer wall of the side current collector 62, the mounting groove 624 is adjacent to the mounting block 323, and the outer wall of the mounting block 323 has a locking groove 3231. The battery also includes a sealing nest 80, which is sleeved on the side current collector 62 and the mounting block 323. A portion of the sealing nest 80 is located in the mounting groove 624, and the end of the sealing nest 80 facing the heat exchange base plate 30 has a locking hook 81, which is located in the locking groove 3231.

[0157] In some embodiments, an edge of the mounting groove 624 close to the heat exchange bottom plate 30 may be flush with an edge of the mounting block 323 away from the heat exchange bottom plate 30 , or may be spaced apart from each other.

[0158] The seal nest 80 contacts both the side current collector 62 and the mounting block 323 .

[0159] In some embodiments, the sealing nest 80 may be made of a polyamide reinforced glass fiber composite material. For example, the sealing nest 80 is made of PA66-GF and may be manufactured by an injection molding process.

[0160] In some embodiments, a cutout may be reserved on one side of the sealing nest 80 to facilitate splitting the cutout of the sealing nest 80 to both sides and fitting it into the mounting groove 624 , and finally gluing the cutout together by applying adhesive or the like.

[0161] It can be understood that the locking barb 81 is located on a side of the sealing nest 80 close to the locking groove 3231. The shape of the locking barb 81 can be adapted to the shape of the locking groove 3231.

[0162] In the embodiment of the present application, the sealing nest 80 can realize a self-locking function, which is beneficial to fixing the relative position between the side current collector 62 and the mounting block 323, reducing the possibility of the side current collector 62 shaking at the mounting block 323, improving the connection stability between the two, and simplifying the connection method between the side current collector 62 and the mounting block 323.

[0163] In related art, heat exchange is performed on the side of a battery cell 20 by combining a harmonica tube plate with a specific tube body (such as an injection-molded tube). This involves a large number of parts, a complex assembly process, and low production efficiency. In contrast, in the embodiment of the present application, the heat exchange side plate 60 and the bottom current collector 32 are connected by inserting the side current collector 62 into the mounting block 323 of the bottom current collector 32 and securing the side current collector 62 and mounting block 323 together using locking barbs 81. This reduces the number of parts involved, simplifies the assembly process, and improves the production efficiency of the battery 1001.

[0164] See also Figure 14 According to some embodiments of the present application, the locking groove 3231 surrounds the outer wall of the mounting block 323 .

[0165] In some embodiments, the locking barbs 81 may also be disposed around the outer side wall of the mounting block 323 .

[0166] In the embodiment of the present application, along the circumferential direction of the mounting block 323, the locking hook 81 can contact the locking groove 3231 everywhere, increasing the contact area between the locking hook 81 and the mounting block 323, thereby improving the connection strength between the side current collector 62 and the mounting block 323 and improving the reliability of the battery.

[0167] See also Figure 15 According to some embodiments of the present application, the end of the sealing nest 80 facing the heat exchange base plate 30 has a plurality of expansion notches 82 arranged at intervals.

[0168] The present application does not limit the shape and size of the expansion notch 82. It is understood that, along the direction from the heat exchange base plate 30 to the sealing nest 80, the height of the expansion notch 82 is less than the height of the sealing nest 80.

[0169] In some embodiments, the plurality of expansion notches 82 are evenly spaced apart on an end of the sealing nest 80 facing the heat exchange base plate 30 .

[0170] In the embodiment of the present application, the expansion notch 82 can enhance the deformability of the end of the sealing nest 80 facing the heat exchange base plate 30 , thereby facilitating installation of the sealing nest 80 on the mounting block 323 and improving battery assembly efficiency.

[0171] According to some embodiments of the present application, an end surface of the sealing nest 80 facing the heat exchange bottom plate 30 has a plurality of side edges, and each side edge has at least one expansion notch 82 .

[0172] For example, when the end surface of the sealing nest 80 facing the heat exchange base plate 30 has four sides, each side may include two expansion notches 82 . The locking barb 81 may be located between the two expansion notches 82 .

[0173] In the embodiment of the present application, each side of the sealing nest 80 having the expansion notch 82 is easily elastically deformed, thereby increasing the deformability of the side of the sealing nest 80, facilitating installation of the sealing nest 80 at the mounting block 323, and improving battery assembly efficiency.

[0174] See also Figure 12According to some embodiments of the present application, the battery further includes a second sealing ring 90 , which is located in the mounting groove 624 , surrounds the side current collector 62 , and contacts the mounting block 323 and the sealing nest 80 .

[0175] That is, the second sealing ring 90 is in contact with the side current collector 62 , the mounting block 323 , and the sealing nest 80 .

[0176] The second sealing ring 90 may protrude from the mounting groove 624 , and the protruding portion may contact the mounting block 323 .

[0177] The material of the second sealing ring 90 includes, but is not limited to, nitrile rubber, fluororubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, polytetrafluoroethylene, nylon, polyurethane, silicone, resin, etc. For example, the material of the second sealing ring 90 can be ethylene propylene rubber. The second sealing ring 90 can be manufactured by a molding process.

[0178] In some embodiments, the steps of assembling the heat exchange side plate 60 and the bottom current collector 32 may include:

[0179] (1) Install the side current collector 62 onto the side heat exchange plate 61, and weld the installation position by laser welding;

[0180] (2) Install the sealing nest 80, the first sealing ring 70 and the second sealing ring 90 onto the surface of the side current collector 62;

[0181] (3) The heat exchange side plate 60 is assembled;

[0182] (4) Insert the heat exchange side plate 60 into the mounting block 323 to complete the assembly of the heat exchange side plate 60 and the bottom current collector 32.

[0183] In the embodiment of the present application, the second sealing ring 90 can improve the sealing between the sealing nest 80 and the side current collector 62 and the mounting block 323, thereby improving the sealing effect at the connection between the mounting block 323 and the side current collector 62.

[0184] Figure 16 This is an assembly diagram of the heat-conducting layer and the heat-exchange side plate of some embodiments of the present application. Figure 17 This is the second schematic diagram of the partial structure of the battery in some embodiments of the present application. Figure 16 and Figure 17The battery 1001 further includes a bottom guard plate 110, which is located on the side of the housing 10 away from the battery cells 20 and is connected to the housing 10. Because the bottom guard plate 110 has a certain mechanical strength, rigidity, and corrosion resistance, it can provide some protection for the housing 10, reducing the possibility of damage to the housing 10 caused by external forces and corrosion of the bottom wall 111, thereby improving the reliability of the battery 1001.

[0185] In some embodiments, the battery 1001 further includes a buffer layer 120, which is located between the housing 10 and the bottom guard plate 110. The buffer layer 120 has excellent shock resistance, pressure resistance, and buffering properties, so that the buffer layer 120 can absorb some external forces, reduce the impact of external forces on the housing 10, and improve the reliability of the battery 1001.

[0186] An embodiment of the present application provides an electrical device, which includes the battery 1001 in the above embodiment, and the battery 1001 is used to provide electrical energy.

[0187] The electrical device has the beneficial effects of the battery 1001 provided in the embodiments of the present application. For details, please refer to the specific description of the battery 1001 in the above embodiments, which will not be repeated here.

[0188] An embodiment of the present application provides an energy storage device, which includes the battery 1001 in the above embodiment, and the battery 1001 is used to store electrical energy.

[0189] The energy storage device has the beneficial effects of the battery 1001 provided in the embodiments of the present application. For details, please refer to the specific description of the battery 1001 in the above embodiments, which will not be repeated here.

[0190] The present embodiment provides a battery 1001, comprising a housing 10, a battery cell 20, and a heat exchange side plate 60. The housing 10 has a storage space 10a, and the battery cell 20 and the heat exchange side plate 60 are both located within the storage space 10a. The heat exchange side plate 60 is connected to the housing 10 and has a side heat exchange cavity 60a. The battery cell 20 has two opposing first surfaces, two opposing second surfaces, and two opposing third surfaces. The area of ​​each first surface is greater than the area of ​​each second surface and the area of ​​each third surface. The heat exchange side plate 60 is opposed to at least one of the second and third surfaces.

[0191] The housing 10 includes a main body 11 and a heat exchange bottom plate 30. The main body 11 includes a bottom wall 111 and side walls 112. The bottom wall 111 and the side walls 112 form a storage space 10a. The heat exchange bottom plate 30 is located within the storage space 10a and is connected to the main body 11, dividing the storage space 10a into a mounting cavity and a bottom heat exchange cavity 10b. The battery cells 20 and the heat exchange side plate 60 are both located in the mounting cavity. The heat exchange side plate 60 is opposite to one of the second and third surfaces, and the heat exchange bottom plate 30 is opposite to the other of the second and third surfaces.

[0192] The side of the heat exchange side plate 60 facing the heat exchange bottom plate 30 has a side connecting hole 622, which is connected to the side heat exchange chamber 60a. The side of the heat exchange bottom plate 30 facing the heat exchange side plate 60 has a bottom connecting hole 311, which is connected to the bottom heat exchange chamber 10b, and the side connecting hole 622 is connected to the bottom connecting hole 311.

[0193] The heat exchange side plate 60 includes a side heat exchange plate 61 and a side fluid collector 62. The side heat exchange cavity 60a is located in the side heat exchange plate 61, and the side heat exchange plate 61 is opposite to one of the second surface and the third surface. The side fluid collector 62 is connected to the heat exchange bottom plate 30. Along the direction parallel to the plate surface of the side heat exchange plate 61, the side fluid collector 62 is located on at least one side of the side heat exchange plate 61, and at least one end of the side heat exchange plate 61 is connected to the side fluid collector 62. The side connecting hole 622 is located in the side fluid collector 62, and the side fluid collector 62 has a side connecting channel 623. The side connecting channel 623 is connected to both the side heat exchange cavity 60a and the side connecting hole 622.

[0194] The side current collector 62 has a guide groove 621 on the side facing the side heat exchange plate 61. A side communication channel 623 extends through the side of the guide groove 621. At least one end of the side heat exchange plate 61 is located within the guide groove 621. The side heat exchange cavity 60a extends through the end surface of the side heat exchange plate 61 facing the guide groove 621. The bottom surface of the guide groove 621 has a limit block 6211, and the side heat exchange plate 61 abuts against the limit block 6211.

[0195] The heat exchange bottom plate 30 includes a bottom heat exchange plate 31 and a bottom fluid collector 32. The bottom heat exchange plate 31 is connected to the body 11 and is located between the bottom heat exchange cavity 10b and the installation cavity. The bottom heat exchange plate 31 is opposite to the other of the second surface and the third surface. The bottom communicating hole 311 is located on the bottom heat exchange plate 31; the bottom fluid collector 32 is connected to the side surface of the bottom heat exchange plate 31 facing the heat exchange side plate 60, and the bottom fluid collector 32 has a bottom communicating channel 325, a first communicating hole 321, and a second communicating hole 322. The first communicating hole 321 and the second communicating hole 322 are both connected to the bottom communicating channel 325, the first communicating hole 321 is connected to the bottom communicating hole 311, and the second communicating hole 322 is connected to the side communicating hole 622.

[0196] When the heat exchange side plate 60 includes a side current collector 62, the bottom current collector 32 has a mounting block 323 on one side surface facing the side current collector 62, the second connecting hole 322 passes through the mounting block 323, one end of the side current collector 62 is located in the mounting block 323, and the battery also includes a first sealing ring 70, which is located between the side current collector 62 and the mounting block 323.

[0197] The outer wall of the side current collector 62 has a mounting groove 624 that surrounds the outer wall of the side current collector 62 and is adjacent to the mounting block 323. The outer wall of the mounting block 323 has a locking groove 3231. The battery also includes a sealing nest 80 that is sleeved between the side current collector 62 and the mounting block 323. A portion of the sealing nest 80 is located within the mounting groove 624. The end of the sealing nest 80 that faces the heat exchange base plate 30 has a locking barb 81 that is located within the locking groove 3231. The locking groove 3231 surrounds the outer wall of the mounting block 323.

[0198] The end of the sealing nest 80 facing the heat exchange base plate 30 has a plurality of expansion notches 82 arranged at intervals. The end surface of the sealing nest 80 facing the heat exchange base plate 30 has a plurality of side edges, each of which has at least one expansion notch 82 .

[0199] The battery also includes a second sealing ring 90, which is located in the mounting groove 624, surrounds the side current collector 62, and contacts the mounting block 323 and the sealing nest 80. The battery also includes a thermally conductive layer 100, which is located at least on the surface of the heat exchange side plate 60 adjacent to the battery cell 20.

[0200] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: The battery comprises: The box body has a receiving space; a battery cell located in the accommodation space, the battery cell having two opposing first surfaces, two opposing second surfaces, and two opposing third surfaces, the area of ​​the first surface being greater than the area of ​​the second surface, and the area of ​​the first surface being greater than the area of ​​the third surface; a heat exchange side plate, located in the accommodating space, connected to the box body, having a side heat exchange cavity, and facing at least one of the second surface and the third surface; The heat-conducting layer is located at least on a surface of the heat-exchange side plate that is close to the battery cell.

2. The battery according to claim 1, characterized in that The box includes: A body comprising a bottom wall and side walls, wherein the bottom wall and the side walls form the accommodation space; a heat exchange bottom plate located in the accommodation space, the heat exchange bottom plate being connected to the body so as to divide the accommodation space into an installation cavity and a bottom heat exchange cavity, the battery cell and the heat exchange side plate being both located in the installation cavity; The heat exchange side plate is opposite to one of the second surface and the third surface, and the heat exchange bottom plate is opposite to the other of the second surface and the third surface.

3. The battery according to claim 2, characterized in that The side of the heat exchange side plate facing the heat exchange bottom plate has a side communicating hole, and the side communicating hole is connected to the side heat exchange cavity. The side of the heat exchange bottom plate facing the heat exchange side plate has a bottom communicating hole, and the bottom communicating hole is connected to the bottom heat exchange cavity. The side communicating hole is connected to the bottom communicating hole.

4. The battery according to claim 3, characterized in that The heat exchange side plate comprises: a side heat exchange plate, wherein the side heat exchange cavity is located on the side heat exchange plate, and the side heat exchange plate is opposite to one of the second surface and the third surface; The side fluid collector is connected to the heat exchange bottom plate. Along the direction parallel to the plate surface of the side heat exchange plate, the side fluid collector is located on at least one side of the side heat exchange plate. At least one end of the side heat exchange plate is connected to the side fluid collector. The side connecting hole is located on the side fluid collector. The side fluid collector has a side connecting channel, and the side connecting channel is connected to both the side heat exchange cavity and the side connecting hole.

5. The battery according to claim 4, characterized in that A guide groove is provided on one side surface of the side collector facing the side heat exchange plate, the side connecting channel passes through the side surface of the guide groove, at least one end of the side heat exchange plate is located in the guide groove, and the side heat exchange cavity passes through the end surface of the side heat exchange plate facing the guide groove.

6. The battery according to claim 5, characterized in that The bottom surface of the guide groove is provided with a limit block, and the side heat exchange plate abuts against the limit block.

7. The battery according to any one of claims 3 to 6, characterized in that The heat exchange bottom plate comprises: a bottom heat exchange plate connected to the body, the bottom heat exchange plate being located between the bottom heat exchange cavity and the mounting cavity, the bottom heat exchange plate being opposite to the other of the second surface and the third surface, and the bottom communicating hole being located on the bottom heat exchange plate; A bottom current collector is connected to a surface of the bottom heat exchange plate facing the heat exchange side plate. The bottom current collector has a bottom communicating channel, a first communicating hole, and a second communicating hole. The first communicating hole and the second communicating hole are both connected to the bottom communicating channel, the first communicating hole is connected to the bottom communicating hole, and the second communicating hole is connected to the side communicating hole.

8. The battery according to claim 7, characterized in that In the case where the heat exchange side plate includes a side current collector, a surface of the bottom current collector facing the side current collector has a mounting block, the second communication hole passes through the mounting block, and one end of the side current collector is located in the mounting block. The battery further includes: The first sealing ring is located between the side current collector and the mounting block.

9. The battery according to claim 8, characterized in that The outer side wall of the side current collector has a mounting groove, the mounting groove surrounds the outer side wall of the side current collector, the mounting groove is adjacent to the mounting block, and the outer side wall of the mounting block has a locking groove. The battery further includes: A sealing nest is sleeved on the side current collector and the mounting block, a portion of the sealing nest is located in the mounting groove, and one end of the sealing nest facing the heat exchange base plate has a locking hook, and the locking hook is located in the locking groove.

10. The battery according to claim 9, characterized in that The locking groove surrounds the outer side wall of the mounting block.

11. The battery according to claim 9, characterized in that The end of the sealing nest facing the heat exchange bottom plate has a plurality of expansion notches arranged at intervals.

12. The battery according to claim 11, characterized in that An end surface of the sealing nest facing the heat exchange bottom plate has a plurality of side edges, and each of the side edges has at least one expansion notch.

13. The battery according to claim 9, characterized in that The battery further comprises: A second sealing ring is located in the mounting groove, the second sealing ring surrounds the side current collector, and the second sealing ring is in contact with the mounting block and the sealing nest.

14. An electrical device, characterized in that: The electrical device comprises the battery according to any one of claims 1 to 13, and the battery is used to provide electrical energy.

15. An energy storage device, characterized in that: The energy storage device comprises the battery according to any one of claims 1 to 13, wherein the battery is used to store electrical energy.

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