Battery devices and electrical equipment

Abstract

This application relates to the field of battery-related technology and discloses a battery device and electrical equipment. The battery device includes a battery cell and a housing. The housing has a first wall and a fixing member. The battery cell is disposed in the housing and supported on the first wall. The fixing member is disposed in the housing and fixedly connected to the housing. The fixing member includes a fixing part and a limiting part connected to each other. The fixing part is disposed on one side of the battery cell along a first direction, and the limiting part abuts against the end of the battery cell opposite to the first wall. The fixing part is provided with a first flow channel for the flow of heat exchange medium. The first direction intersects the arrangement direction of the battery cell and the first wall. By providing the fixing member, the reliability of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of battery-related technology, and in particular to a battery device and electrical equipment. Background Technology

[0002] This section provides only background information relevant to this application and is not necessarily prior art.

[0003] With the rising demand for clean energy, battery devices have been widely developed. Battery devices can efficiently store and release electrical energy, and their performance and structural design are crucial to the operating efficiency and reliability of electrical equipment.

[0004] Improving the reliability of battery devices has always been a key focus during the research and development process. Utility Model Content

[0005] In view of the above problems, this application provides a battery device and an electrical appliance to at least improve the reliability of the battery device.

[0006] The first aspect of this application discloses a battery device, including a battery cell and a housing. The housing has a first wall and a fixing member. The battery cell is disposed in the housing and supported on the first wall. The fixing member is disposed in the housing and fixedly connected to the housing. The fixing member includes a fixing part and a limiting part connected to each other. The fixing part is disposed on one side of the battery cell along a first direction. The limiting part abuts against the end of the battery cell opposite to the first wall. The fixing part is provided with a first flow channel for the flow of heat exchange medium. The first direction intersects the arrangement direction of the battery cell and the first wall.

[0007] In the technical solution of this application embodiment, the reliability of the battery device is improved by setting a fixing member. Specifically, the limiting part of the fixing member presses against the end of the battery cell away from the first wall, thereby fixing the battery cell to the first wall, improving the ease of assembly of the battery cell and the stability of the battery cell within the housing, and reducing the possibility of connection failure between the battery cell and the housing. The fixing part of the fixing member is provided with a first flow channel for the flow of heat exchange medium, which can improve the thermal management capability of the battery device.

[0008] In addition, the battery device according to this application may also have the following additional technical features:

[0009] In some embodiments of this application, both the fixing part and the first flow channel extend along a second direction, and the first direction, the second direction, and the arrangement direction of the battery cell and the first wall intersect each other. The fact that both the fixing part and the first flow channel extend along the second direction improves the ease of processing the flow channel; the second direction typically corresponds to the length direction of the battery device, allowing the first flow channel to be relatively long, thus improving the smoothness of the heat exchange medium flow and the heat exchange area.

[0010] In some embodiments of this application, along the arrangement direction of the battery cell and the first wall, the first flow channel includes a plurality of sub-flow channel cavities spaced apart. By spaced apart multiple sub-flow channel cavities, the flow area of ​​the heat exchange medium within the fixing part can be increased, thereby improving heat exchange efficiency, while also maintaining good strength of the fixing part.

[0011] In some embodiments of this application, the first flow channel extends along a second direction, the section of the fixing part perpendicular to the second direction is a first section, the section of the first flow channel perpendicular to the second direction is a second section, the area of ​​the second section of the first flow channel is greater than or equal to 30% and less than or equal to 80% of the area of ​​the first section, and the first direction, the second direction, and the arrangement direction of the battery cell and the first wall intersect each other. By setting the area of ​​the second section of the first flow channel to 30% to 80% of the area of ​​the first section, the flow area of ​​the heat exchange medium in the fixing part can be increased, the heat exchange efficiency can be improved, and the fixing part can maintain good strength.

[0012] In some embodiments of this application, along the arrangement direction of the battery cell and the first wall, the size of the fixing part is H1, and the size of the first flow channel is H, with the ratio of H to H1 ranging from 65% to 97%; and / or, along the first direction, the size of the fixing part is L1, and the size of the first flow channel is L, with the ratio of L to L1 ranging from 40% to 80%. In this embodiment of the battery device, by limiting the size L and size H of the first flow channel, the flow area of ​​the heat exchange medium within the fixing part can be increased, thereby improving heat exchange efficiency, while simultaneously maintaining good strength of the fixing part.

[0013] In some embodiments of this application,

[0014] The first flow channel includes at least one sub-flow channel cavity extending along a second direction, wherein the first direction, the second direction, and the arrangement direction of the battery cell and the first wall intersect each other; along the first direction, the size L2 of the sub-flow channel cavity ranges from 4 mm to 10 mm; and / or, along the first direction, the wall thickness L3 of the sub-flow channel cavity ranges from 1.5 mm to 3 mm; and / or, along the arrangement direction of the battery cell and the first wall, the size H2 of the sub-flow channel cavity ranges from 11 mm to 97 mm; and / or, along the arrangement direction of the battery cell and the first wall, the wall thickness H3 of the sub-flow channel cavity ranges from 1.5 mm to 5 mm; and / or, along the arrangement direction of the battery cell and the first wall, the first flow channel has 1 to 5 of the sub-flow channel cavities. These limitations in size / number allow for better support strength of the fixing portion while improving thermal management capabilities.

[0015] In some embodiments of this application, the limiting portion is provided with a second flow channel for the flow of heat exchange medium. By providing a second flow channel within the limiting portion, the thermal management capability of the battery device can be improved, enabling the thermal management capability of the battery device to meet the requirements of large capacity. It can also improve the uniformity of cell temperature regulation in the battery device, improve the performance and reliability of the battery device, and reduce or eliminate the cavities of the heat exchange medium in the first wall, thereby increasing the energy density of the battery device.

[0016] In some embodiments of this application, a heat-conducting structure is provided between the first wall and the battery cell; and / or, a heat-conducting structure is provided between the fixing part and the battery cell; and / or, a heat-conducting structure is provided between the limiting part and the battery cell. By providing a heat-conducting structure, the thermal conductivity of the battery cell can be improved, the temperature regulation capability of the battery cell can be improved, and the reliability of the battery device can be improved.

[0017] In some embodiments of this application, the first wall is a solid plate, or the first wall is provided with a cavity for the flow of the heat exchange medium. Making the first wall a solid plate allows for a reduction in its thickness while maintaining the same strength, thus reducing the weight of the battery device, increasing its energy density, and lowering production costs. By providing a cavity, the thermal management capability of the battery device can be improved, making it suitable for high-capacity or fast-charging battery devices.

[0018] In some embodiments of this application, the rated capacity of the battery device is less than 40 kWh, and the rated charging rate of the battery device is less than 3 times the charging rate, and the first wall is set as a solid plate; or, the rated capacity of the battery device is greater than or equal to 40 kWh and / or the rated charging rate of the battery device is greater than or equal to 3 times the charging rate, and the first wall is provided with a cavity for the flow of heat exchange medium. The larger the rated capacity of the battery device, the more heat will be dissipated during use; the higher the charging rate of the battery device, the more heat needs to be dissipated per unit time. When the rated capacity of the battery device is small and the charging rate is low, setting the first wall as a solid plate can reduce the thickness of the first wall, reduce the weight of the battery device, increase the energy density of the battery device, and reduce production costs; when the rated capacity of the battery device is large or the charging rate is high, the first wall is provided with a cavity, which can improve the thermal management capability of the battery device and meet the thermal management requirements of the battery device.

[0019] In some embodiments of this application, a buffer component is provided between the fixing part and the battery cell and / or between the limiting part and the battery cell. The buffer component can provide buffer protection, reduce the possibility of damage to the battery cell by the fixing part or the limiting part, and improve the reliability of the battery device.

[0020] In some embodiments of this application, the battery cell includes a housing and electrode terminals. The end of the housing facing away from the first wall is a first end, and the electrode terminals are located at the first end. A limiting portion abuts against the first end and is spaced apart from the electrode terminals. A buffer member disposed between the limiting portion and the battery cell includes a first part and a second part that are sequentially arranged at an included angle and connected. The first part is disposed between the limiting portion and the electrode terminals, and the second part is disposed between the limiting portion and the first end. The first part can reduce the possibility of the limiting portion damaging the electrode terminals, and the second part can reduce the possibility of the limiting portion damaging the housing, thereby improving the reliability of the battery device.

[0021] In some embodiments of this application, along the arrangement direction of the battery cells and the first wall, one end of the fixing part is connected to the first wall, and the other end of the fixing part is connected to the limiting part. By connecting the fixing part to the first wall and the limiting part, the limiting part, the fixing part, and the first wall are relatively fixed, which can improve the fixing stability between the fixing part and the housing, and facilitates processing.

[0022] In some embodiments of this application, the fixing part and the first wall are integrally formed; and / or, the limiting part and the fixing part are assembled separately. The first wall and the fixing part are integrally extruded from a profile. This design is convenient to process and ensures that the two are tightly connected and seamlessly integrated, with good integrity and connection strength, which can reduce the risk of failure due to improper connection. At the same time, the flatness of the fixing part and the first wall themselves, as well as the connection position between the two, is good, which is beneficial to improving the assembly stability of the battery cell. By assembling the fixing part and the limiting part separately, during the assembly process of the battery device, the battery cell can be lowered onto the first wall from the end of the fixing part away from the first wall (the upper end), and then the limiting part is assembled onto the fixing part, so that the limiting part presses against the battery cell. The method of assembling the limiting part later can facilitate the lowering of the battery cell into the box, reduce the interference of components on the battery cell, and improve the assembly efficiency of the battery cell.

[0023] In some embodiments of this application, the battery cells are configured as a plurality of cells, and the plurality of battery cells are configured as at least one row. Each row includes a plurality of battery cells arranged along a second direction. Each row of battery cells has a fixing member disposed on at least one side along the first direction. Along the second direction, the fixing part, the limiting part, and the first flow channel all extend from one end of a row of battery cells to the other end. The limiting part of each fixing member abuts against a plurality of battery cells in its adjacent row. The first direction, the second direction, and the arrangement direction of the battery cells and the first wall intersect each other. The fixing part can be disposed between battery cells in adjacent rows, providing a larger volume for the first flow channel and improving thermal management capabilities. The limiting part extends along the arrangement direction of the battery cells in the same row and can simultaneously abut against multiple battery cells, resulting in a simple structure, convenient arrangement, and improved assembly efficiency.

[0024] A second aspect of this application provides an electrical device including a battery device as described in this application or any embodiment thereof, the battery device being used to store electrical energy or provide electrical energy.

[0025] The electrical device according to this application has the same beneficial effects as the battery device proposed in this application or any embodiment of this application.

[0026] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0028] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0029] Figure 2 This is a schematic diagram of the structure of a battery device proposed in some embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the battery cell as proposed in some embodiments of this application;

[0031] Figure 4 This is a schematic diagram showing the partial components of a battery device proposed in some embodiments of this application;

[0032] Figure 5 This is an assembly structure diagram of some components of the battery device proposed in some embodiments of this application;

[0033] Figure 6 This is an assembly cross-sectional view of some components of a battery device proposed in some embodiments of this application;

[0034] Figure 7 for Figure 6 Enlarged view of part A;

[0035] Figure 8 This is a cross-sectional view of a partial structure of a battery device proposed in some embodiments of this application;

[0036] Figure 9 This is a cross-sectional view of a partial structure of a battery device proposed in some embodiments of this application.

[0037] The reference numerals in the detailed embodiments are as follows:

[0038] 1000, Vehicle; 10, Battery unit; 20, Controller; 30, Motor;

[0039] 100. Housing; 101. First housing; 102. Second housing; 103. Receiving cavity; 104. First wall; 105. Second wall; 106. Third wall; 109. Fixing component; 110. Fixing part; 111. Second end; 112. First flow channel; 113. Sub-flow channel cavity; 120. Limiting part; 121. First limiting part; 1211. Welding hole; 1212. First hole wall; 1213. First pressing part; 122. Second limiting part; 1222. Second pressing part; 123. Second flow channel; 130. Buffer component; 131. First part; 132. Second part; 133. First buffer component; 160. Cavity; 170. Heat-conducting structure; 190. Rivet nut;

[0040] 200. Battery cell assembly; 210. Battery cell; 211. Electrode assembly; 212. Housing; 213. Shell; 214. End cap; 215. Tab; 216. Electrode terminal; 217. First end;

[0041] X, first direction; Y, second direction; Z, arrangement direction. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0050] With the increasing demand for clean energy, battery devices are widely used in electronic devices, electric vehicles, power tools, and other fields. The performance of battery devices directly affects the operating efficiency and reliability of electrical equipment. Battery devices can include a casing and individual battery cells, which can be arranged in groups. Research has found that existing battery devices have many problems with the fixing and grouping methods of individual battery cells, affecting the reliability of the battery device.

[0051] Traditionally, battery cells are bonded to a casing using structural adhesive to form a battery pack. The process involves applying structural adhesive to the bottom of the casing, placing the battery cells vertically inside, and securing them to the casing with the adhesive. This method significantly increases the weight of the battery pack, reducing its energy density and impacting its overall performance. Secondly, the adhesive requires extremely high bonding strength, necessitating the use of high-strength glue, which undoubtedly increases manufacturing costs. Furthermore, the adhesive application areas on both the battery cells and the casing need to achieve high flatness and cleanliness, and the application process requires complex steps such as settling and baking, further increasing manufacturing costs. More importantly, the strength of the structural adhesive is easily affected by temperature and humidity during manufacturing, as well as external loads during vehicle operation, leading to delamination and impacting the stability and reliability of the battery pack.

[0052] The study also found that traditional battery devices typically use bottom-mounted cooling of individual battery cells for thermal management to regulate the temperature of the individual cells. This method has limited thermal management capabilities for individual battery cells, and in order to form heat exchange medium channels, it is usually necessary to increase the overall thickness of the bottom wall of the battery device, which is not conducive to improving the energy density of the battery device.

[0053] To improve the limitations of thermal management capabilities of battery devices and to overcome the shortcomings of relying on structural adhesive for fixation, this application proposes a battery device in which a fixing member is fixed inside the housing. The fixing member includes a fixing part and a limiting part that are connected to each other. The fixing part is disposed on one side of the battery cell along a first direction, and the limiting part abuts against the end of the battery cell away from the first wall. The fixing part is provided with a flow channel for the flow of heat exchange medium (refer to the first flow channel). The first direction intersects the arrangement direction of the battery cell and the first wall.

[0054] The limiting part of the fixing component presses against the end of the battery cell away from the first wall, thus fixing the battery cell to the first wall. This limiting part ensures reliable fixation of the battery cell, improving assembly convenience and stability within the housing, and reducing the possibility of connection failure between the battery cell and the housing. The fixing part of the fixing component also features a first flow channel for the heat exchange medium, enhancing the thermal management capabilities of the battery unit.

[0055] The fastener, fixedly connected to the housing, uses its own limiting part to mechanically restrain the battery cells, keeping them relatively fixed to the first wall. This facilitates smooth assembly of the battery cells, reducing or eliminating the use of structural adhesive, lowering the added weight, and increasing the energy density of the battery device. It also reduces reliance on high-precision adhesive application equipment and complex processes, lowering manufacturing costs. Furthermore, this fixing method is less susceptible to the effects of temperature and humidity during the process, as well as external loads from the operating equipment, reducing the possibility of connection failure due to adhesive detachment, minimizing cell movement within the housing, and reducing the risk of wear and damage from collisions between and between battery cells and the housing. A first flow channel is provided within the fastener, allowing for temperature regulation of the battery cells via a heat exchange medium. This improves the thermal management capabilities of the battery device, reduces or eliminates the heat exchange medium cavities in the first wall, and further increases the energy density of the battery device.

[0056] The battery device disclosed in this application is applicable to various electrical devices that use battery devices, and can be used to form the power system of the electrical device. The electrical device can be a mobile phone, portable device, laptop, electric vehicle, electric toy, power tool, vehicle, ship, and spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0057] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0058] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 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. A battery device 10 is installed inside the vehicle 1000, and the battery device 10 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 10 can be used to power the vehicle 1000; for example, the battery device 10 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0059] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0060] like Figure 2 As shown, Figure 2 The diagram below illustrates the structure of a battery device according to some embodiments of this application. The battery device 10 mentioned in the embodiments of this application may include one or more battery cell assemblies 200 for providing voltage and capacity. The battery cell assembly 200 may include one or more battery cells 210, and the multiple battery cells 210 are connected in series, parallel, or mixed connection through a busbar.

[0061] In some embodiments, the battery cell assembly 200 is typically formed by arranging a plurality of battery cells 210.

[0062] As an example, the battery cell assembly 200 can be a battery module, which is formed by arranging and fixing multiple battery cells 210 together. As an example, the battery module can be formed by bundling multiple battery cells 210 together with cable ties.

[0063] In some embodiments, the battery device 10 may be a battery pack, which includes a housing 100 and one or more battery cell assemblies 200, the battery cell assemblies 200 being housed in the housing 100.

[0064] As an example, the battery cell assembly 200 can be a battery module, which can be housed in the housing 100 by fixing the battery module in the housing 100.

[0065] As an example, the battery cell assembly 200 can also be housed in the housing 100 by directly fixing multiple battery cells 210 to the housing 100.

[0066] As an example, the housing 100 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 are fastened together to form a closed space inside the housing 100 to house the battery cell assembly 200. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 101 may be a top cover or a bottom plate.

[0067] As an example, the housing 100 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 100 forms an enclosed space to house the battery cell assembly 200.

[0068] In some embodiments, the housing 100 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 100 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 100 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0069] In some embodiments, battery device 10 refers to an energy storage device, which includes a cabinet with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc.

[0070] In this embodiment of the application, the battery cell 210 can be a secondary battery, which refers to a battery cell 210 that can be used again after being discharged by recharging to activate the active materials.

[0071] The battery cell 210 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0072] like Figure 3 As shown, Figure 3 The diagram below shows a split view of a battery cell according to some embodiments of this application. The battery cell 210 generally includes an electrode assembly 211. The electrode assembly 211 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 210, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0073] In some embodiments, the electrode assembly 211 is provided with tabs 215 that can conduct current from the electrode assembly 211. The tabs 215 include a positive tab 215 and a negative tab 215.

[0074] In some implementations, the tab 215 may be connected to an electrode terminal 216, which is electrically connected to the tab 215 to enable the connection of the electrode assembly 211 with an external circuit and the transmission of current. The electrode terminal 216 may be directly connected to the tab 215 or indirectly connected to the tab 215 via a current collector.

[0075] In some embodiments, the battery cell 210 may include a housing 212. The housing 212 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 212), or an aluminum-plastic film, etc. In some embodiments, the housing 212 may be a sealed structure or a non-sealed structure. As an example, when the housing 212 is a non-sealed structure, the housing 212 serves to protect the electrode assembly 211, and a sealing bag is also included between the housing 212 and the electrode assembly 211. The sealing bag is used to encapsulate the electrode assembly 211 and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating structure or an aluminum-plastic film. When the housing 212 is a sealed structure, it is used to encapsulate the electrode assembly 211 and the electrolyte, etc.

[0076] As an example, the battery cell 210 can be a cylindrical battery cell 210, a prismatic battery cell 210, a pouch battery cell 210, or a battery cell 210 of other shapes. The prismatic battery cell 210 includes a prismatic battery cell 210, a blade-shaped battery cell 210, and a multi-prismatic battery, such as a hexagonal prismatic battery. There are no particular limitations in this application.

[0077] In some embodiments, the housing 212 includes an end cap 214 and a housing 213, the housing 213 having an opening, and the end cap 214 covering the opening. The housing 213 may have one or more openings. The end cap 214 may also have one or more.

[0078] In some embodiments, at least one electrode terminal 216 is provided on the housing 212, and the electrode terminal 216 is electrically connected to the tab 215. The electrode terminal 216 can be directly connected to the tab 215, or it can be indirectly connected to the tab 215 through a current collector. The electrode terminal 216 can be provided on the end cap 214, or it can be provided on the housing 213.

[0079] like Figure 2 and Figure 3 and combined Figures 4 to 7 As shown, Figure 4 This is a schematic diagram showing the partial components of the battery device proposed in some embodiments of this application. Figure 5 This is an assembly structure diagram of some components of the battery device proposed in some embodiments of this application. Figure 6 This is an assembly cross-sectional view of some components of the battery device proposed in some embodiments of this application. Figure 7 for Figure 6The enlarged view of part A shows that this application provides a battery device 10, including a battery cell 210 and a housing 100. The housing 100 has a first wall 104 and a fixing member 109. The battery cell 210 is disposed inside the housing 100 and supported on the first wall 104. The fixing member 109 is disposed inside the housing 100 and fixedly connected to the housing 100. The fixing member 109 includes a fixing part 110 and a limiting part 120 connected to each other. The fixing part 110 is disposed on one side of the battery cell 210 along the first direction X. The limiting part 120 abuts against the end of the battery cell 210 away from the first wall 104. The fixing part 110 is provided with a first flow channel 112 for the flow of heat exchange medium. The first direction X intersects the arrangement direction Z of the battery cell 210 and the first wall 104.

[0080] The housing 100 has a receiving cavity 103 for placing the battery cell 210. A fixing member 109 may be provided in the receiving cavity 103.

[0081] The first wall 104 is the wall of the housing 100 that surrounds the receiving cavity 103, that is, the wall of the housing 100 surrounding one side of the battery cell 210. At least during the process of assembling the battery cell 210 into the housing 100, the first wall 104 can provide support for the battery cell 210. In other words, at least during the process of assembling the battery cell 210 into the housing 100, the first wall 104 is located below the battery cell 210 and supports the battery cell 210.

[0082] For example, the first wall 104 may be the bottom wall of the housing 100, and the battery cell 210 is disposed on and supported by the first wall 104. Here, the bottom wall of the housing 100 refers to the portion of the housing 100 surrounding the bottom of the receiving cavity 103, which is a reference description of the battery device 10 in its normal use state.

[0083] Alternatively, in some other embodiments, the first wall 104 may also be a side wall or a top wall of the housing 100. The side wall or top wall of the housing 100 is described with reference to the battery device 10 in a normal use state.

[0084] The fastener 109 is disposed on the side of the first wall 104 facing the receiving cavity 103.

[0085] The fastener 109 is fixedly connected to the housing 100. Specifically, the fastening part 110 is connected to the housing 100, and the limiting part 120 is connected to the fastening part 110, so that the fastening part 110 and the limiting part 120 are both relatively fixed to the housing 100. Alternatively, the limiting part 120 is connected to the housing 100, and the fastening part 110 is connected to the limiting part 120, so that the fastening part 110 and the limiting part 120 are both relatively fixed to the housing 100. Or, the fastening part 110 and the limiting part 120 are respectively fixedly connected to the housing 100.

[0086] Optionally, along the first direction X intersecting the arrangement direction Z of the battery cell 210 and the first wall 104, one end of the fixing part 110 is fixedly connected to the first wall 104, and the other end of the fixing part 110 is fixedly connected to the limiting part 120. The fixing part 110 and the first wall 104 can be detachably connected or are an integral structure. In the integral structure, the fixing part 110 and the first wall 104 can be an integrally formed structure or a structure that is processed separately and then assembled into an integral structure.

[0087] For example, a fixing part 110 is integrally provided on the first wall 104, that is, the fixing part 110 and the first wall 104 are configured as an integral structure. It should be noted that an integral setting or integral structure refers to two components forming a continuous and indivisible whole structure. Indivisible means that it cannot be separated into two parts without damaging the structure or connection. The implementation methods of an integral setting or integral structure include integral molding (e.g., injection molding, extrusion, 3D printing), fusion connection (e.g., welding, fusion welding), etc.

[0088] Optionally, along the second direction Y, the housing 100 has opposing second walls 105 and third walls 106. The first wall 104 and second wall 105 are respectively connected to the first wall 104 and both surround the accommodating cavity 103. Along the second direction Y, the two ends of the limiting portion 120 are respectively connected to the second wall 105 and the third wall 106. The first direction X, the second direction Y, and the arrangement direction Z of the battery cell 210 and the first wall 104 intersect each other. Specifically, the two ends of the limiting portion 120 are connected to the second wall 105 and the third wall 106 by welding, riveting, bolting, or other methods. The connection of the limiting portion 120 to the second wall 105 and the third wall 106 of the housing 100 can improve the overall rigidity of the housing 100, enhance the fixing effect on the battery cell 210, and increase the resistance to expansion forces of the housing 100.

[0089] For example, such as Figures 4 to 7 As shown, the two ends of the limiting part 120 along the second direction Y are riveted by rivet nuts 190.

[0090] Optionally, along the second direction Y, both ends of the fixing part 110 are connected to the second wall 105 and the third wall 106, respectively. Specifically, both ends of the fixing part 110 are connected to the second wall 105 and the third wall 106 by welding, riveting, bolting, or other methods. The connection between the fixing part 110 and the second wall 105 and the third wall 106 of the housing 100 can improve the overall rigidity of the housing 100, enhance the fixing effect on the battery cell 210, and increase the resistance of the housing 100 to expansion forces.

[0091] For example, the second wall 105 and the third wall 106 are provided with insertion holes, and the two ends of the fastener 109 are inserted into the insertion holes, and its insertion part is welded to the second wall 105 or the third wall 106.

[0092] It should be noted that the second wall 105 can be the frame of the box 100 or an expansion beam installed inside the box 100; the third wall 106 can be the frame of the box 100 or an expansion beam installed inside the box 100.

[0093] The limiting part 120 and the fixing part 110 can be detachably connected or be an integral structure. In the case of an integral structure, the limiting part 120 and the fixing part 110 can be an integrally formed structure or a structure that is assembled and connected into one piece after separate processing.

[0094] The first flow channel 112 is a hollow cavity formed within the fixed portion 110. It can be used directly for the flow of heat exchange medium, or a pipe can be installed within the first flow channel 112, and the heat exchange medium can flow within the pipe. The first flow channel 112 can extend along the second direction Y, or it can be arranged along the arrangement direction Z of the battery cells 210 and the first wall 104. That is, the heat exchange medium can flow along the second direction Y or the arrangement direction Z of the battery cells 210 and the first wall 104.

[0095] The heat exchange medium is typically a fluid, which can be a liquid or a gas. For example, the heat exchange medium can be an aqueous solution containing an antifreeze, or a refrigerant, etc.

[0096] The first direction X can be approximately perpendicular to the arrangement direction Z of the battery cells 210 on the first wall 104. For example, the battery cells 210 are configured in multiple rows, and the first direction X can be the arrangement direction Z between the rows of battery cells 210.

[0097] The shapes of the fixing part 110, the limiting part 120, and the first flow channel 112 can be configured as needed. For example, the limiting part 120 can be a plate, the fixing part 110 can be a generally square plate, and the first flow channel 112 can be a structure with a generally rectangular cross-section.

[0098] Optionally, the battery cell 210 can be a prismatic battery. The height direction of the battery cell 210 is parallel to the arrangement direction Z of the battery cell 210 and the first wall 104. A fixing member 109 is provided on one or both sides of the length direction of the battery cell 210, and a limiting part 120 abuts against the end of the battery cell 210 in the height direction. The length dimension of the battery cell 210 is greater than its width dimension, and the length dimension of the battery cell 210 can be greater than its height dimension. The dimension H1 of the fixing part 110 along the arrangement direction Z of the battery cell 210 and the first wall 104 is greater than its dimension L1 along the first direction X.

[0099] In this embodiment, the battery device 10 improves its reliability by incorporating a fixing member 109. Specifically, the limiting portion 120 of the fixing member 109 presses against the end of the battery cell 210 facing away from the first wall 104, thus fixing the battery cell 210 to the first wall 104. The limiting portion 120 of the fixing member 109 ensures reliable fixation of the battery cell 210, improving the ease of assembly and the stability of the battery cell 210 within the housing 100, and reducing the possibility of connection failure between the battery cell 210 and the housing 100.

[0100] The fixing part 110 of the fixing member 109 is provided with a first flow channel 112 for the flow of heat exchange medium, which can improve the thermal management capability of the battery device 10. The fixing member 109 is fixedly connected to the housing 100, and its own limiting part 120 can limit the battery cell 210 by mechanical pressing, so that the battery cell 210 is relatively fixed to the first wall 104, realizing the smooth assembly of the battery cell 210. It can reduce or eliminate the use of structural adhesive, reduce the additional weight added by structural adhesive, and improve the energy density of the battery device 10. At the same time, it reduces the dependence on high-precision adhesive equipment and complex process flow, and reduces manufacturing costs. Furthermore, this fixing method is not easily affected by temperature and humidity during the process and external loads during the operation of electrical equipment, reducing the possibility of connection failure of battery cell 210 due to delamination, reducing the shaking of battery cell 210 within housing 100, and reducing the risk of wear and damage caused by collision between battery cells 210 and between battery cells 210 and housing 100.

[0101] A first flow channel 112 is provided in the fixed part 110. The temperature of the battery cell 210 can be regulated by the heat exchange medium in the first flow channel 112, thereby improving the thermal management capability of the battery device 10, enabling the thermal management capability of the battery device 10 to meet the requirements of large capacity, improving the uniformity of cell temperature regulation of the battery device 10, improving the performance and reliability of the battery device 10, and reducing or eliminating the heat exchange medium cavity 160 of the first wall 104, thereby increasing the energy density of the battery device 10.

[0102] According to some embodiments of this application, optionally, the fixing part 110 and the first flow channel 112 both extend along the second direction Y, and the first direction X, the second direction Y and the arrangement direction Z of the battery cell 210 and the first wall 104 intersect each other.

[0103] The fixed part 110 extends along the second direction Y, which can be understood as the length direction of the fixed part 110 being consistent with the second direction Y. The first flow channel 112 extends along the second direction Y, which can be understood as the heat exchange medium flowing in the first flow channel 112 along the second direction Y.

[0104] The arrangement directions Z, Y, and X of the battery cells 210 and the first wall 104 can be approximately perpendicular to each other in pairs. The second direction Y focuses on the arrangement direction Z of multiple battery cells 210 in the same row.

[0105] For example, the first direction X can be the width direction of the battery device 10, the second direction Y can be the length direction of the battery device 10, and the arrangement direction Z of the battery cell 210 and the first wall 104 can be the height direction of the battery device 10.

[0106] Both the fixing part 110 and the first flow channel 112 extend along the second direction Y, which can improve the processing convenience of the flow channel; the second direction Y usually corresponds to the length direction of the battery device 10, and the length of the first flow channel 112 can be relatively long, which improves the smooth flow of the heat exchange medium and the heat exchange area.

[0107] According to some embodiments of this application, optionally, along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, the first flow channel 112 includes a plurality of sub-flow channel cavities 113.

[0108] In other words, along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, the fixing part 110 has a plurality of sub-flow channel cavities 113. The plurality of sub-flow channel cavities 113 are arranged independently and spaced apart from each other, and together form a first flow channel. The plurality of sub-flow channel cavities 113 can be connected in series or arranged in parallel.

[0109] For example, the dimension of the fixing part 110 along the second direction Y is greater than its dimension H1 along the arrangement direction Z of the battery cell 210 and the first wall 104. The dimension H1 of the fixing part 110 along the arrangement direction Z of the battery cell 210 and the first wall 104 can be greater than the dimension L1 along the first direction X. Along the arrangement direction Z of the battery cell 210 and the first wall 104, the fixing part 110 is provided with three sub-flow channel cavities 113 at intervals. The three sub-flow channel cavities 113 are aligned in the first direction X to form a row. Each sub-flow channel cavity 113 extends along the second direction Y. The three sub-flow channel cavities 113 serve as the first flow channel 112.

[0110] By setting multiple sub-channel cavities 113 at intervals, the flow area of ​​the heat exchange medium in the fixed part 110 can be increased, the heat exchange efficiency can be improved, and the fixed part 110 can maintain good strength.

[0111] According to some embodiments of this application, optionally, the first flow channel 112 extends along the second direction Y, the section of the fixing part 110 perpendicular to the second direction Y is the first section, the section of the first flow channel 112 perpendicular to the second direction Y is the second section, the area of ​​the second section of the first flow channel 112 is greater than or equal to 30% and less than or equal to 80% of the area of ​​the first section, and the first direction X, the second direction Y and the arrangement direction Z of the battery cell 210 and the first wall 104 intersect each other.

[0112] The area of ​​the second cross section of the first flow channel 112 refers to the area of ​​the flow cross section of the first flow channel 112, that is, the area of ​​the annular shape formed by the inner wall of the first flow channel 112. When the first flow channel 112 has multiple sub-flow channel cavities 113, the area of ​​the second cross section of the first flow channel 112 is equal to the sum of the flow cross section areas of all the sub-flow channel cavities 113, that is, the sum of the areas of the second cross sections of all the sub-flow channel cavities 113 located on the same fixing part 110. For example, if a fixing part 110 is provided with three sub-flow channel cavities 113, the area of ​​the second cross section of the first flow channel 112 is the sum of the areas of the second cross sections of the three sub-flow channel cavities 113.

[0113] The area of ​​the first cross section refers to the area of ​​the overall cross section of the fixed part 110, which includes the area of ​​the second cross section of the first flow channel 112 and the cross section area of ​​the wall surrounding the first flow channel 112.

[0114] For example, the area of ​​the second cross section of the first flow channel 112 is 30%, 32%, 35%, 40%, 50%, 60%, 70%, 77.6%, or 80% of the area of ​​the first cross section.

[0115] By setting the area of ​​the second cross section of all the first flow channels 112 to 30% to 80% of the area of ​​the first cross section, the flow area of ​​the heat exchange medium in the fixed part 110 can be increased, the heat exchange efficiency can be improved, and the fixed part 110 can maintain good strength.

[0116] According to some embodiments of this application, optionally, along the Z direction of arrangement of the battery cell 210 and the first wall 104, the size of the fixing part 110 is H1, and the size of the first flow channel 112 is H, with the ratio of H to H1 ranging from 65% to 97%; and / or, along the first direction X, the size of the fixing part 110 is L1, and the size of the first flow channel 112 is L, with the ratio of L to L1 ranging from 40% to 80%.

[0117] The dimension H1 of the fixing part 110 can be understood as the maximum dimension of the fixing part 110 along the arrangement direction Z of the battery cell 210 and the first wall 104, and the dimension H of the first flow channel 112 can be understood as the maximum dimension of the first flow channel 112 along the arrangement direction Z of the battery cell 210 and the first wall 104.

[0118] The dimension L1 of the fixing part 110 can be understood as the maximum dimension of the fixing part 110 along the first direction X, and the dimension L of the first flow channel 112 can be understood as the maximum dimension of the first flow channel 112 along the first direction X.

[0119] When the first flow channel 112 includes multiple sub-flow channel cavities 113 along the arrangement direction Z of the battery cell 210 and the first wall 104, the dimension H of the first flow channel 112 is equal to the sum of the dimensions H2 of all the sub-flow channel cavities 113 located on the same fixing part 110 and arranged along the arrangement direction Z of the battery cell 210 and the first wall 104. For example, as... Figure 6 and Figure 7 As shown, along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, the fixing part 110 is provided with three sub-flow channel cavities 113, which serve as the first flow channel 112. The three sub-flow channel cavities 113 are aligned at both ends in the first direction X. At this time, the sum of H2 of the three sub-flow channel cavities 113 arranged along the Z-direction of the arrangement of the battery cell 210 and the first wall 104 is also the size H of the first flow channel 112.

[0120] When the first flow channel 112 includes multiple sub-flow channel cavities 113 along the first direction X, the dimension L of the first flow channel 112 refers to the sum of the dimensions L2 of all sub-flow channel cavities 113 located on the same fixed part 110 and arranged sequentially along the first direction X. For example, as... Figure 6 and Figure 7 As shown, and in combination Figure 8 and Figure 9 As shown, Figure 8 This is a cross-sectional view of a partial structure of a battery device proposed in some embodiments of this application. Figure 9 This is a cross-sectional view of a partial structure of a battery device proposed in some embodiments of this application. The fixing part 110 actually has only one row of sub-flow channel cavities 113 along the first direction X, so that the largest of the three sub-flow channel cavities 113 along the first direction X dimension L2 is the dimension L of the first flow channel 112.

[0121] For example, the ratio of H to H1 in the first flow channel 112 can be 65%, 70%, 75%, 80%, 85%, 90%, or 97%.

[0122] The ratio of L to L1 in the first flow channel 112 can be 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, or 80%.

[0123] In this embodiment, the battery device 10 can increase the flow area of ​​the heat exchange medium in the fixing part 110 by limiting the dimensions L and H of the first flow channel 112, thereby improving the heat exchange efficiency, while also maintaining good strength of the fixing part 110.

[0124] According to some embodiments of this application, optionally, the first flow channel 112 includes at least one sub-flow channel cavity 113 extending along the second direction Y, wherein the first direction X, the second direction Y, and the arrangement direction Z of the battery cell 210 and the first wall 104 intersect each other; along the first direction X, the size L2 of the sub-flow channel cavity 113 ranges from 4 mm to 10 mm; and / or, along the first direction X, the wall thickness L3 of the sub-flow channel cavity 113 ranges from 1.5 mm to 3 mm. Meters; and / or, along the Z-direction of the battery cell 210 and the first wall 104, the dimension H2 of the sub-channel cavity 113 ranges from 11 mm to 97 mm; and / or, along the Z-direction of the battery cell 210 and the first wall 104, the wall thickness H3 of the sub-channel cavity 113 ranges from 1.5 mm to 5 mm; and / or, along the Z-direction of the battery cell 210 and the first wall 104, the first channel has 1 to 5 sub-channel cavities 113.

[0125] For example, along the first direction X, the dimension L2 of the sub-channel cavity 113 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. It is understood that the dimension L2 of the sub-channel cavity 113 is in the range of 4 mm to 10 mm. This allows the dimension L1 of the fixing part 110 along the first direction X to be maintained within a reasonable range while improving thermal management capabilities. This addresses the problem of the fixing part 110 occupying a large space due to its large dimension L1 caused by the sub-channel cavity 113, thereby reducing the impact of the fixing member 109 on the energy density of the battery device 10.

[0126] The wall thickness L3 of the sub-flow channel cavity 113 refers to the wall thickness of the first flow channel 112 along the first direction X, and it can be the maximum value of the wall thickness of the first flow channel 112 along the first direction X. For example, the wall thickness L3 of the sub-flow channel cavity 113 can be 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, or 3 mm. It is understood that the wall thickness L3 of the sub-flow channel cavity 113 is in the range of 1.5 mm to 3 mm. This can keep the dimension L1 of the fixing part 110 along the first direction X within a reasonable range while improving thermal management capabilities. This improves the problem of the fixing part 110 having a large dimension L1, which leads to a large space occupation, thereby reducing the impact of the fixing member 109 on the energy density of the battery device 10.

[0127] The dimension H2 of the sub-flow channel cavity 113 can be 11 mm, 15 mm, 20 mm, 50 mm, 85 mm, or 97 mm. It is understood that a dimension H2 range of 11 mm to 97 mm allows for better support strength of the fixing part 110 while improving thermal management capabilities, and also enhances the ease of machining the fixing part 110.

[0128] The wall thickness H3 of the sub-flow channel cavity 113 refers to the wall thickness of the first flow channel 112 along one side of the arrangement direction Z of the battery cell 210 and the first wall 104. It can be the maximum value of the wall thickness of the first flow channel 112 along the arrangement direction Z. The wall thickness H3 of the sub-flow channel cavity 113 can be 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, or 5 mm. It can be understood that the wall thickness H3 of the sub-flow channel cavity 113 is in the range of 1.5 mm to 5 mm along the arrangement direction Z of the battery cell 210 and the first wall 104, which can improve the thermal management capability while giving the fixing part 110 better support strength.

[0129] For example, along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, the number of sub-flow channel cavities 113 is set to 1, 2, 3, 4, or 5. It is understood that setting the number of sub-flow channel cavities 113 to 1 to 5 can alleviate the problem of increased processing difficulty and reduced flow cross-section caused by too many flow channels.

[0130] It should be noted that, given a fixed dimension H1 for the fixing part 110, the more sub-channel cavities 113 are provided along the Z-direction of the battery cell 210 and the first wall 104, the smaller the dimension H2 of each sub-channel cavity 113 is generally. The dimension limitation and the limitation on the number of sub-channel cavities 113 in this embodiment can be applied to battery cells 210 with a height (i.e., the dimension of the battery cell 210 along the Z-direction of the battery cell 210 and the first wall 104) of approximately 100 to 150 mm. For example, the height of the battery cell 210 can be 120 mm. Naturally, it can also be applied to battery cells 210 of other sizes.

[0131] According to some embodiments of this application, optionally, such as Figure 9 As shown, the limiting part 120 is provided with a second flow channel 123 for the flow of heat exchange medium.

[0132] The second flow channel 123 within the limiting part 120 can be provided as one or more. The first flow channel 112 and the second flow channel 123 can be connected in series or in parallel.

[0133] By providing a second flow channel 123 within the limiting portion 120, the thermal management capability of the battery device 10 can be improved, enabling the thermal management capability of the battery device 10 to meet the requirements of large capacity. It can also improve the uniformity of cell temperature regulation in the battery device 10, improve the performance and reliability of the battery device 10, and reduce or eliminate the heat exchange medium cavity 160 of the first wall 104, thereby increasing the energy density of the battery device 10.

[0134] According to some embodiments of this application, optionally, such as Figures 6 to 7 As shown, a heat-conducting structure 170 is provided between the first wall 104 and the battery cell 210; and / or, a heat-conducting structure 170 is provided between the fixing part 110 and the battery cell 210; and / or, a heat-conducting structure 170 is provided between the limiting part 120 and the battery cell 210.

[0135] The thermally conductive structure 170 can be a thermally conductive pad or thermally conductive adhesive, etc., and the thermally conductive pad can be fixed by adhesive. The thermally conductive structure 170 and the corresponding buffer component 130 can be an integral structure, that is, the buffer component 130 can be set as the thermally conductive structure 170, and the thermally conductive structure 170 can also have buffering performance.

[0136] By setting the heat-conducting structure 170, the heat conduction efficiency of the battery cell 210 can be improved, the temperature regulation capability of the battery cell 210 can be improved, and the reliability of the battery device 10 can be improved.

[0137] According to some embodiments of this application, optionally, the first wall 104 is a solid plate, or the first wall 104 is provided with a cavity 160 for the flow of heat exchange medium.

[0138] For example, the first wall 104 is a solid plate, such as Figure 6 and Figure 7 As shown, the solid plate can be understood as a plate without a cavity 160 for the flow of heat exchange medium, and the solid plate can be a single-layer plate. The battery cell 210 can be thermally managed by the first flow channel 112 of the fixing part 110. The first wall 104 is set as a solid plate. Under the same strength, the thickness of the first wall 104 can be reduced, the weight of the battery device 10 can be reduced, the energy density of the battery device 10 can be increased, and the production cost can be reduced.

[0139] For example, such as Figure 8 and Figure 9 As shown, the first wall 104 is provided with a cavity 160 for the flow of heat exchange medium. The cavity 160 can be connected in series with the first flow channel 112 or arranged in parallel. By providing the cavity 160, the thermal management capability of the battery device 10 can be improved, making it suitable for large-capacity or fast-charging battery devices 10.

[0140] According to some embodiments of this application, optionally, the rated capacity of the battery device 10 is less than 40kWh and the rated charging rate of the battery device 10 is less than 3 times the charging rate, and the first wall 104 is set as a solid single-layer plate; or, the rated capacity of the battery device 10 is greater than or equal to 40kWh and / or the rated charging rate of the battery device 10 is greater than or equal to 3 times the charging rate, and the first wall 104 is provided with a cavity 160 for the flow of heat exchange medium.

[0141] The rated capacity of the battery device 10 is the amount of electricity that the battery device 10 can release when discharged to the termination voltage at a low discharge rate at a standard temperature. This is the amount of electricity that the battery device 10 can output under ideal conditions, and can be used as the theoretical or design value of the capacity of the battery device 10.

[0142] The charging rate is the rate at which a battery is charged, which is the ratio of the charging current to the battery's rated capacity. The formula for calculating the charging rate is: Charging rate (C) = Charging current / Battery rated capacity. For example, assuming a battery with a rated capacity of 100 Ah (ampere-hours), if the charging current is 50 A (amps), then the charging rate is 0.5C.

[0143] The charging rate set during battery use is usually called the calibrated charging rate, also known as the set charging rate or target charging rate. It refers to the charging rate set by the battery management system or charging equipment based on the battery's characteristics and the usage environment during actual battery use, to ensure the safety and efficiency of the charging process.

[0144] It is understandable that the larger the rated capacity of the battery device 10, the more heat it will dissipate during use; the higher the charging rate of the battery device 10, the more heat it needs to dissipate per unit time. When the rated capacity and charging rate of the battery device 10 are small, the first wall 104 can be made into a solid plate, which can reduce the thickness of the first wall 104, reduce the weight of the battery device 10, increase the energy density of the battery device 10, and reduce production costs. When the rated capacity or charging rate of the battery device 10 is large, the first wall 104 can be provided with a cavity 160, which can improve the thermal management capability of the battery device 10 and meet the thermal management requirements of the battery device 10.

[0145] According to some embodiments of this application, optionally, such as Figures 4 to 9 As shown, a buffer member 130 is provided between the fixing part 110 and the battery cell 210 and / or between the limiting part 120 and the battery cell 210.

[0146] The buffer component 130 has a certain buffering performance. It can be a rubber or soft plastic pad, or it can be a glue layer formed after the glue dries.

[0147] The buffer component 130 can be configured as an insulating structure, which refers to a device that provides electrical isolation. By configuring the buffer component 130 as an insulating structure, the possibility of short circuits caused by the electrical connection between the battery cell 210 and the limiting part 120 (or the fixing part 110) can be reduced, thereby improving the reliability of the battery device 10.

[0148] The buffer component 130 can be configured as a thermally conductive structure 170, which refers to a device with good thermal conductivity. By configuring the buffer component 130 as a thermally conductive structure 170, the heat dissipation performance of the battery cell 210 can be improved.

[0149] Optionally, a buffer member 130 is provided between the fixing part 110 and the battery cell 210. The buffer member 130 can provide buffer protection, reduce the possibility of damage to the battery cell 210 by the fixing part 110, and improve the reliability of the battery device 10. The buffer member 130 can cover the entire area between the fixing part 110 and the battery cell 210, or it can be provided only in a localized area between the fixing part 110 and the battery cell 210.

[0150] Optionally, a buffer member 130 is provided between the limiting part 120 and the battery cell 210. The buffer member 130 can provide buffer protection, reduce the possibility of damage to the battery cell 210 by the limiting part 120, and improve the reliability of the battery device 10.

[0151] Optionally, a buffer component 130 may be provided between the battery cell 210 and the first wall 104. The buffer component 130 can play a buffering and protective role, reduce the possibility of the battery cell 210 being damaged by the first wall 104, and improve the reliability of the battery device 10.

[0152] For example, such as Figures 4 to 9 As shown, a buffer component 130 may be provided at the corner of the battery cell 210.

[0153] According to some embodiments of this application, optionally, such as Figures 5 to 9 As shown, the battery cell 210 includes a housing 213 and an electrode terminal 216. The end of the housing 213 facing away from the first wall 104 is the first end 217. The electrode terminal 216 is located at the first end 217. The limiting part 120 presses against the first end 217 and is spaced apart from the electrode terminal 216. The buffer member 130 (understood with reference to the first buffer member 133) disposed between the limiting part 120 and the battery cell 210 includes a first part 131 and a second part 132 that are arranged at an included angle and connected in sequence. The first part 131 is disposed between the limiting part 120 and the electrode terminal 216, and the second part 132 is disposed between the limiting part 120 and the first end 217.

[0154] The first end 217 can be understood by referring to the end cap 214.

[0155] The first part 131 and the second part 132 can be separate or integrated. For example, the first part 131 and the second part 132 are integrally formed.

[0156] For example, the first part 131 can be attached to the limiting part 120, and the first part 131 and the limiting part 120 can be spaced apart.

[0157] For example, the second portion 132 may be pressed between the limiting portion 120 and the first end portion 217.

[0158] The first part 131 can reduce the possibility of the limiting part 120 damaging the electrode terminal 216, and the second part 132 can reduce the possibility of the limiting part 120 damaging the housing 213, thereby improving the reliability of the battery device 10.

[0159] According to some embodiments of this application, optionally, such as Figures 4 to 9 As shown, along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, one end of the fixing part 110 is connected to the first wall 104, and the other end of the fixing part 110 is connected to the limiting part 120.

[0160] Optionally, the battery cell 210 includes a housing 213, with one end of the housing 213 facing away from the bottom wall being a first end 217, a limiting part 120 pressing against the end face of the first end 217, and one end of the fixing part 110 facing away from the first wall 104 being a second end 111, with the limiting part 120 connected to the end face of the second end 111. Along the Z-direction of the arrangement of the battery cell 210 and the first wall 104, the end face of the first end 217 is flush with the end face of the second end 111, or the end face of the first end 217 is closer to the first wall 104 than the end face of the second end 111. The end face of the second end 111 is further away from the first wall 104 than the end face of the first end 217, so that the fixing part 110 can be higher than or flush with the housing 213 of the battery cell 210. When the limiting part 120 and the fixing part 110 are assembled and connected, they are less likely to be interfered with by the battery cell 210, thus improving the ease of assembly between the limiting part 120 and the fixing part 110.

[0161] For example, the battery cell 210 and the first wall 104 are arranged in a direction Z that is approximately the height direction (i.e., the vertical direction) of the battery device 10. Along the height direction of the battery device 10, the end face of the second end 111 of the fixing part 110 is flush with the end face of the first end 217, or the end face of the second end 111 is located above the end face of the first end 217.

[0162] For example, the fixing part 110 and the first wall 104 can be processed separately and then assembled into a whole structure. For example, the fixing part 110 and the first wall 104 can be welded into a whole structure.

[0163] For example, the fixing part 110 and the first wall 104 can also be an integrally formed structure. For instance, the fixing part 110 and the first wall 104 can be processed by injection molding, profile extrusion, or other methods.

[0164] The limiting part 120 and the fixing part 110 can be detachably connected or can be assembled into a single structure.

[0165] The fixing part 110 is connected to the first wall 104 and the limiting part 120, so that the limiting part 120, the fixing part 110 and the first wall 104 are relatively fixed, which can improve the fixing stability between the fixing part 110 and the box 100 and facilitate the processing.

[0166] According to some embodiments of this application, optionally, the fixing part 110 and the first wall 104 are integrally formed; and / or, the limiting part 120 and the fixing part 110 are separately assembled and connected.

[0167] Optionally, the fixing part 110 and the first wall 104 are integrally formed.

[0168] An integrally molded structure refers to two structures or components that are molded into a single unit during the manufacturing process. For example, the fixing part 110 and the first wall 104 can be integrally molded by injection molding (or casting) or integral extrusion of profiles. In particular, the fixing part 110 and the first flow channel 112 thereon can both be integrally molded.

[0169] Optionally, the first wall 104 and the fixing part 110 are integrally extruded from the same raw material (profile) through an extrusion process, forming a single unit.

[0170] The profile forming the first wall 104 and the fixing part 110 has good plasticity, and it can be a metal profile or an alloy profile, such as an aluminum alloy profile, an aluminum profile or a steel profile.

[0171] The first wall 104 and the fixing part 110 are integrally extruded from the profile. This design is easy to process and can ensure that the two are tightly connected and seamlessly integrated, with good integrity and connection strength, which can reduce the risk of failure due to improper connection. At the same time, the flatness of the fixing part 110 and the first wall 104 themselves and the connection position of the two is good, which is conducive to improving the assembly stability of the battery cell 210.

[0172] Optionally, the fixing part 110 and the limiting part 120 are connected by separate assembly. That is, the fixing part 110 and the limiting part 120 can be processed separately first, and then assembled and connected and fixed by a corresponding connection method. For example, the fixing part 110 and the limiting part 120 can be processed separately and then connected by welding or riveting.

[0173] For example, the fixing part 110 and the limiting part 120 are welded into a single structure. Specifically, the fixing part 110 and the limiting part 120 can be welded by laser welding. The welding process of the fixing part 110 and the limiting part 120 can be performed after the battery cell 210 is assembled into the housing 100. The welding process of the electrode terminals 216 of the battery cell 210 to the busbar component can be completed in the same step as the welding process of the fixing part 110 and the limiting part 120, which can reduce production steps and improve production efficiency. The welded connection of the fixing part 110 and the limiting part 120 can have high strength and can reduce the number of connecting components, reducing the possibility of interference between components.

[0174] In one implementation, such as Figures 6 to 9 As shown, the limiting part 120 has a welding hole 1211, through which the limiting part 120 is welded to the corresponding fixing part 110. The two opposite holes of the welding hole 1211 in the first direction X are called first hole walls 1212, and the two first hole walls 1212 are inclined away from each other from the end facing the fixing part 110 to the end facing away from the fixing part 110. The welding hole 1211 can correspond to the end face of the second end 111 of the fixing part 110, and the limiting part 120 can be connected to the second end 111 of the fixing part 110 through the welding hole 1211 using methods such as laser welding.

[0175] For example, the welding hole 1211 can be provided in the middle of the first limiting part 121 along the first direction X, along the arrangement direction Z of the battery cell 210 and the first wall 104, and the welding hole 1211 passes through both sides of the first limiting part 121.

[0176] Along the second direction Y, the limiting part 120 may be provided with a plurality of welding holes 1211 at intervals.

[0177] In this embodiment, the battery device 10 is connected by separate assembly via a fixing part 110 and a limiting part 120. During the assembly process of the battery device 10, the battery cell 210 can be lowered from the end (upper end) of the fixing part 110 away from the first wall 104 onto the first wall 104 firstly, and then the limiting part 120 is assembled onto the fixing part 110 so that the limiting part 120 presses against the battery cell 210. The method of assembling the limiting part 120 laterally facilitates the lowering of the battery cell 210 into the casing, reduces interference of components with the battery cell 210, and improves the assembly efficiency of the battery cell 210.

[0178] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5As shown, multiple battery cells 210 are configured, and the multiple battery cells 210 are configured in at least one row. Each row includes multiple battery cells 210 arranged along the second direction Y. Each row of battery cells 210 is provided with a fixing member 109 on at least one side along the first direction X. Along the second direction Y, the fixing part 110, the limiting part 120 and the first flow channel 112 all extend from one end of a row of battery cells 210 to the other end. The limiting part 120 of each fixing member 109 presses against the multiple battery cells 210 in its adjacent row. The first direction X, the second direction Y and the arrangement direction Z of the battery cells 210 intersect each other.

[0179] For example, the battery cell 210 can be a prismatic battery, with the large faces of two adjacent battery cells 210 in the same row facing each other.

[0180] The second direction Y is the arrangement direction Z of multiple battery cells 210 in the same row, and the first direction X is the arrangement direction Z between rows. Multiple battery cells 210 in the same row can be considered as a single battery cell assembly 200, i.e., a battery module.

[0181] For example, the limiting part 120 can press against all the battery cells 210 in the same row adjacent to it.

[0182] The fixing part 110 can be disposed between adjacent rows of battery cells 210, which can provide a larger volume for the first flow channel 112 and improve thermal management capability; the limiting part 120 extends along the arrangement direction Z of the battery cells 210 in the same row and can simultaneously press against multiple battery cells 210. The structure is simple, the arrangement is convenient, and it is beneficial to improve assembly efficiency.

[0183] like Figures 2 to 7As shown, this application embodiment provides a battery device 10, including a housing 100 and a plurality of battery cells 210. The housing 100 has a receiving cavity, a first wall 104, a second wall 105, and a third wall 106. The first wall 104 is the bottom wall of the housing 100, and the second wall 105 and the third wall 106 are two opposite side walls of the housing 100 along a second direction Y. The first wall 104, the second wall 105, and the third wall 106 are all surrounding the receiving cavity. The plurality of battery cells 210 are disposed in the receiving cavity 103 and are all supported by the first wall 104. The plurality of battery cells 210 are arranged in multiple rows along the first direction X, and each row of battery cells 210 is arranged sequentially along the second direction Y. The fixing member 109 includes a fixing part 110 and a limiting part 120. A plurality of fixing parts 110 are integrally extruded on the side of the first wall 104 facing the receiving cavity 103. Along the first direction X, fixing portions 110 are provided between adjacent battery cells 210 and at both ends of all battery cells 210. A limiting portion 120 is provided in the accommodating cavity 103, comprising a first limiting portion 121 and a second limiting portion 122. The limiting portion 120 located at the fixing portions 110 at both ends of all battery cells 210 along the first direction X is the second limiting portion 122, and the limiting portion 120 located between the fixing portions 110 of adjacent battery cells 210 is the first limiting portion 121. Along the first direction X, the second limiting part 122 protrudes from the fixing part 110 on the side facing the battery cell 210 to form a second pressing part 1222. The second pressing part 1222 of the second limiting part 122 presses against the end of the battery cell 210 away from the first wall 104. The end face of the second limiting part 122 and its corresponding fixing part 110 (the end face of the second end 111) correspond to each other and are welded together. The second limiting part 122 and its corresponding fixing part 110 are connected to the second wall 105 and the third wall 106 respectively. Along the second direction Y, the second pressing part 1222 presses against all the battery cells 210 in its adjacent row. Along the first direction X, a first limiting part 121 is disposed between two adjacent battery cells 210, and both sides of the first limiting part 121 protrude relative to the fixing part 110 to form a first pressing part 1213. The first limiting part 121 and its corresponding fixing part 110 are respectively connected to the second wall 105 and the third wall 106. Along the second direction Y, the two first pressing parts 1213 press against all battery cells 210 in two adjacent rows. A welding hole 1211 is provided in the middle of the first limiting part 121. The welding hole 1211 corresponds to the end face (end face of the second end 111) of its corresponding fixing part 110. The first limiting part 121 is welded to the corresponding fixing part 110 through the welding hole 1211. The fixing part 110 is provided with a first flow channel 112 along the Z direction of the arrangement of the battery cell 210 and the first wall 104. The first flow channel 112 includes a plurality of sub-flow channel cavities 113 arranged at intervals, and each sub-flow channel cavity 113 extends along the second direction.The battery cell 210 includes a housing 213 and electrode terminals 216. The end of the housing 213 facing away from the first wall 104 is a first end 217. The electrode terminals 216 are located at the first end 217. A limiting portion 120 abuts against the first end 217 and is spaced apart from the electrode terminals 216. An insulating thermally conductive structure 170 is provided between the housing 213 of the battery cell 210 and the first wall 104, and between the housing 213 of the battery cell 210 and the fixing portion 110. The thermally conductive structure 170 can be a thermally conductive pad. A buffer member 130 (refer to the first buffer member 133) is provided between the battery cell 210 and the limiting portion 120. The buffer member 130 (refer to the first buffer member 133) includes a first part 131 and a second part 132 that are arranged at an included angle and connected in sequence. The first part 131 is disposed between the limiting portion 120 and the electrode terminals 216, and the second part 132 is disposed between the limiting portion 120 and the first end 217.

[0184] like Figure 8 As shown, in another embodiment, the first wall 104 may be provided with a cavity 160 for the flow of heat exchange medium.

[0185] like Figure 9 As shown, in another embodiment, the limiting part 120 is provided with a second flow channel 123 for the flow of heat exchange medium.

[0186] Some embodiments of this application also provide an electrical device, including a battery device 10 as proposed in this application or any embodiment of this application, the battery device 10 being used to store electrical energy or provide electrical energy.

[0187] The electrical equipment can be any of the above-mentioned electrical devices or systems.

[0188] The electrical equipment in this embodiment has the same beneficial effects as the battery device 10 proposed in this application or any embodiment of this application.

[0189] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments, and their similarities or similarities can be referred to each other. For the sake of brevity, these will not be repeated here.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; The housing has a first wall and a fixing member. The battery cell is disposed in the housing and supported on the first wall. The fixing member is disposed in the housing and fixedly connected to the housing. The fixing member includes a fixing part and a limiting part that are connected to each other. The fixing part is disposed on one side of the battery cell along a first direction. The limiting part abuts against the end of the battery cell opposite to the first wall. The fixing part is provided with a first flow channel for the flow of heat exchange medium. The first direction intersects the arrangement direction of the battery cell and the first wall.

2. The battery device according to claim 1, characterized in that, Both the fixing part and the first flow channel extend along the second direction, and the first direction, the second direction, and the arrangement direction of the battery cell and the first wall intersect each other.

3. The battery device according to claim 2, characterized in that, Along the arrangement direction of the battery cell and the first wall, the first flow channel includes a plurality of sub-flow channel cavities spaced apart.

4. The battery device according to claim 1, characterized in that, The first flow channel extends along the second direction, the fixed part has a first cross section perpendicular to the second direction, the first flow channel has a second cross section perpendicular to the second direction, the area of ​​the second cross section of the first flow channel is greater than or equal to 30% and less than or equal to 80% of the area of ​​the first cross section, and the first direction, the second direction and the arrangement direction of the battery cell and the first wall intersect each other.

5. The battery device according to claim 1, characterized in that, Along the arrangement direction of the battery cell and the first wall, the size of the fixing part is H1, and the size of the first flow channel is H, and the ratio of H to H1 ranges from 65% to 97%. And / or, along the first direction, the size of the fixing part is L1, and the size of the first flow channel is L, wherein the ratio of L to L1 ranges from 40% to 80%.

6. The battery device according to claim 1, characterized in that, The first flow channel includes at least one sub-flow channel cavity extending along the second direction, and the first direction, the second direction, and the arrangement direction of the battery cell and the first wall intersect each other. Along the first direction, the dimension L2 of the sub-channel cavity ranges from 4 mm to 10 mm; and / or, along the first direction, the wall thickness L3 of the sub-channel cavity ranges from 1.5 mm to 3 mm; and / or, along the arrangement direction of the battery cell and the first wall, the dimension H2 of the sub-channel cavity ranges from 11 mm to 97 mm; and / or, along the arrangement direction of the battery cell and the first wall, the wall thickness H3 of the sub-channel cavity ranges from 1.5 mm to 5 mm; and / or, along the arrangement direction of the battery cell and the first wall, the first channel has 1 to 5 of the sub-channel cavities.

7. The battery device according to claim 1, characterized in that, The limiting part is provided with a second flow channel for the heat exchange medium to flow.

8. The battery device according to claim 1, characterized in that, A heat-conducting structure is provided between the first wall and the battery cell; And / or, a heat-conducting structure is provided between the fixing part and the battery cell; And / or, a heat-conducting structure is provided between the limiting part and the battery cell.

9. The battery device according to claim 1, characterized in that, The first wall is a solid plate, or the first wall is provided with a cavity for the flow of heat exchange medium.

10. The battery device according to claim 9, characterized in that, The rated capacity of the battery device is less than 40kWh, and the rated charging rate of the battery device is less than 3 times the charging rate. The first wall is set as a solid plate. Alternatively, the rated capacity of the battery device is greater than or equal to 40 kWh and / or the rated charging rate of the battery device is greater than or equal to 3 times the charging rate, and the first wall is provided with a cavity for the flow of heat exchange medium.

11. The battery device according to claim 1, characterized in that, A buffer component is provided between the fixing part and the battery cell and / or between the limiting part and the battery cell.

12. The battery device according to claim 11, characterized in that, The battery cell includes a housing and electrode terminals. The end of the housing facing away from the first wall is the first end. The electrode terminals are located at the first end. The limiting part abuts against the first end and is spaced apart from the electrode terminals. The buffer component disposed between the limiting part and the battery cell includes a first part and a second part that are arranged at an included angle and connected in sequence. The first part is disposed between the limiting part and the electrode terminals, and the second part is disposed between the limiting part and the first end.

13. The battery device according to any one of claims 2-11, characterized in that, Along the arrangement direction of the battery cell and the first wall, one end of the fixing part is connected to the first wall, and the other end of the fixing part is connected to the limiting part.

14. The battery device according to claim 13, characterized in that, The fixing part and the first wall are integrally formed; And / or, the limiting part and the fixing part are separately assembled and connected.

15. The battery device according to any one of claims 1-11, characterized in that, The battery cells are configured in multiple units, and the multiple battery cells are configured in at least one row. Each row includes multiple battery cells arranged along a second direction. Each row of battery cells is provided with a fixing member on at least one side along the first direction. Along the second direction, the fixing part, the limiting part, and the first flow channel all extend from one end of a row of battery cells to the other end. The limiting part of each fixing member abuts against the multiple battery cells in its adjacent row. The first direction, the second direction, and the arrangement direction of the battery cells and the first wall intersect each other.

16. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1-15, the battery device being used to store electrical energy or provide electrical energy.

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