Battery device, battery system and electric equipment

Abstract

The utility model relates to the related technical field of batteries, and discloses a battery device, a battery system and electric equipment.The battery device comprises a box body assembly and a battery monomer assembly, the box body assembly is provided with a first containing cavity in a surrounding mode, the box body assembly is provided with a cavity side wall part, and the cavity side wall part is arranged in the first containing cavity in a surrounding mode; the battery monomer assembly is arranged in the first accommodating cavity, the cavity side wall part surrounds the outer side of the battery monomer assembly, the box body assembly comprises an expansion beam, at least one end of the battery monomer assembly is provided with the expansion beam, the expansion beam is arranged as a part of the cavity side wall part, and the expansion beam is used for resisting the expansion force of the battery monomer assembly and is arranged along the circumferential direction of the cavity side wall part; the cavity side wall part is at least provided with a flow channel for a heat exchange medium to flow in a beam body of the expansion beam, the cavity side wall part is provided with an inflow port and an outflow port, the inflow port and the outflow port are communicated with the flow channel, the inflow port is used for enabling the heat exchange medium to flow into the flow channel, and the outflow port is used for enabling the heat exchange medium flowing through the flow channel to flow out of the flow channel; and the temperature regulation and control capability of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery device, a battery system and electrical equipment. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] Battery devices are able to store electrical energy. They can be used in electrical devices, such as vehicles, as a power source. They can also be used in energy storage devices, such as power stations, to store electricity for subsequent use by electrical devices. Temperature has a significant impact on the performance of battery devices. Too low a temperature will reduce battery activity and may make it impossible to charge or discharge. Too high a temperature will risk thermal runaway. How to improve the temperature control capabilities of battery devices has always been a topic of concern in battery development. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device, a battery system and an electrical equipment to at least improve the temperature control capability of the battery device.

[0005] The first aspect of the present application proposes a battery device, including a box assembly and a battery cell assembly, the box assembly is surrounded by a first accommodating cavity, the box assembly has a cavity side wall portion, and the cavity side wall portion is surrounded by the first accommodating cavity; the battery cell assembly is arranged in the first accommodating cavity, and the cavity side wall portion is surrounded by the outside of the battery cell assembly, the box assembly includes an expansion beam, at least one end of the battery cell assembly is provided with the expansion beam, the expansion beam is configured as a part of the cavity side wall portion, the expansion beam is used to resist the expansion force of the battery cell assembly, along the circumference of the cavity side wall portion, the cavity side wall portion is provided with a flow channel for the flow of heat exchange medium at least in the beam body of the expansion beam, the cavity side wall portion is provided with an inlet and an outlet, the inlet and the outlet are both connected to the flow channel, the inlet is used to allow the heat exchange medium to flow into the flow channel, and the outlet is used to allow the heat exchange medium that has flowed through the flow channel to flow out of the flow channel.

[0006] In the technical solution of the embodiment of the present application, the expansion beam can be in contact with the battery cell assembly, and the cavity side wall portion is provided with a flow channel at least in the expansion beam, and the flow channel can allow the heat exchange medium to flow. During the use of the battery device, the heat exchange medium flows through the flow channel of the cavity side wall portion (at least including the flow channel in the expansion beam), and the temperature of the battery cell assembly can be controlled, so that the cavity side wall portion surrounding the battery cell assembly participates in the thermal management of the battery cell assembly, thereby improving the temperature control capability (i.e., thermal management capability) of the battery device. In addition, by providing the flow channel in the wall body of the cavity side wall portion surrounding the battery cavity, the side of the battery device can participate in the thermal management of the battery device without providing or reducing the provision of additional heat exchange components, and the structure is compact, occupies less space, and reduces the impact on the energy density of the battery device.

[0007] In addition, the battery device according to the present application may also have the following additional technical features:

[0008] In some embodiments of the present application, along the height direction of the battery device, the flow dimension of the flow channel is 50% to 90% of the height dimension of the cavity side wall portion in the area corresponding to the flow channel, and the height dimension of the cavity side wall portion is the dimension between the top end surface and the bottom end surface of the cavity side wall portion. The flow dimension of the flow channel in this embodiment is 50% to 90% of the height dimension L of the cavity side wall portion in the area corresponding to the flow channel, which can not only make the cavity side wall portion have better support strength, but also make a larger area of ​​the cavity side wall portion participate in the thermal management of the battery device, thereby improving the thermal management capability of the battery device.

[0009] In some embodiments of the present application, the box assembly further includes a box, the expansion beam includes a first expansion beam, the first expansion beam is disposed in the box, and the box is divided into the first accommodating chamber and the second accommodating chamber, the second accommodating chamber accommodates the electronic control component of the battery device, and the flow channel is disposed in the first expansion beam. By arranging the flow channel in the first expansion beam, when the heat exchange medium flows through the flow channel of the first expansion beam, the temperature of the battery cell assembly can be controlled, so that the box side wall of the battery device participates in the thermal management of the battery cell assembly, thereby improving the temperature control capability of the battery device.

[0010] In some embodiments of the present application, the box assembly includes a box, the box includes a first box side wall and a second box side wall arranged opposite to each other, at least a portion of the first box side wall and at least a portion of the second box side wall are respectively arranged as part of the cavity side wall portion, the two ends of the expansion beam are respectively connected to the first box side wall and the second box side wall, and the wall body of the first box side wall and / or the wall body of the second box side wall are provided with the flow channel. By providing the flow channel in the first box side wall and the second box side wall, when the heat exchange medium flows through the flow channel of the first box side wall and the second box side wall, the temperature of the battery cell assembly can be controlled, so that the box side wall of the battery device participates in the thermal management of the battery cell assembly, and the temperature control capability of the battery device is improved.

[0011] In some embodiments of the present application, the flow channel of the expansion beam is connected to the flow channel of the first box side wall and / or the flow channel of the second box side wall. The cavity side wall portion can be provided with only one inlet and one outlet connected to the thermal management device, which has a simple structure and convenient component arrangement.

[0012] In some embodiments of the present application, the wall body of the first box side wall and the wall body of the second box side wall are both provided with the flow channel, and the flow channel of the first box side wall, the flow channel of the expansion beam, and the flow channel of the second box side wall are connected in series. Corresponding to the flow channel of the expansion beam, the flow channel of the first box side wall, and the flow channel of the second box side wall, the cavity side wall only needs to be provided with one inlet and one outlet connected to the thermal management device, which has a simple structure and convenient component arrangement.

[0013] In some embodiments of the present application, the expansion beam includes a second expansion beam and a first expansion beam, and along the first direction, the second expansion beam and the first expansion beam are arranged relative to each other at intervals, the battery cell assembly is arranged between the second expansion beam and the first expansion beam, and the flow channel is respectively arranged in the beam body of the second expansion beam and the beam body of the first expansion beam, and the flow channel of the first box side wall, the flow channel of the second expansion beam, the flow channel of the second box side wall and the flow channel of the first expansion beam are connected in series, the first direction intersects with the second direction, and the second direction is the arrangement direction from the first box side wall to the second box side wall. Corresponding to the flow channel of the first box side wall, the flow channel of the second expansion beam, the flow channel of the second box side wall and the flow channel of the fourth expansion beam, the cavity side wall portion only needs to be provided with one inlet and one outlet connected to the thermal management device, and the structure is simple and the component arrangement is convenient.

[0014] In some embodiments of the present application, the second expansion beam is connected to the end of the first box side wall and the end of the second box side wall, and the second expansion beam is connected to the same end of the first box side wall and the second box side wall, and the second expansion beam is set as a part of the box side wall of the box body. In other words, the second expansion beam serves as the box side wall of the box body, and the structure is simple.

[0015] In some embodiments of the present application, the outflow port is communicated with the flow channel of the first box side wall, the outflow port is arranged on the first expansion beam, and the flow channel of the first expansion beam is communicated with the outflow port. The heat exchange medium can flow through the flow channel of the first box side wall, the flow channel of the second expansion beam, the flow channel of the second box side wall and the flow channel of the first expansion beam, and the structure is simple and the components are not easy to interfere with each other.

[0016] In some embodiments of the present application, the battery device further includes an inlet connector and an outlet connector, wherein the inlet connector is connected to the periphery of the inlet and communicates with the inlet, and the outlet connector is connected to the periphery of the outlet and communicates with the outlet. The inlet connector and the outlet connector facilitate the connection between the battery device and the heat exchange system.

[0017] The battery device further includes an inlet joint and an outlet joint. The inlet is arranged on the first expansion beam or the side wall of the box body surrounding the second accommodating cavity. The inlet joint is connected to the periphery of the inlet and communicates with the inlet. The outlet is arranged on the first expansion beam or the side wall of the box body surrounding the second accommodating cavity. The outlet joint is connected to the periphery of the outlet and communicates with the outlet. Both the inlet joint and the outlet joint are arranged at a position of the box body or the expansion beam close to the second accommodating cavity. The inlet joint and the outlet joint basically do not occupy the space of the battery cell assembly, which is conducive to improving the rationality of the arrangement of the components and facilitating the assembly of the inlet joint and the outlet joint with the thermal management device respectively.

[0018] In some embodiments of the present application, the first box side wall and / or the second box side wall include a first part and a second part connected to each other, the first part is arranged around the first accommodating cavity, the second part is arranged on the corresponding side of the first part away from the first accommodating cavity, and the first part is provided with the flow channel. The first part is the part of the first box side wall and the second box side wall close to the battery monomer assembly. The flow channel is arranged in the first part of the first box side wall and the first part of the second box side wall, which can improve the heat exchange efficiency between the heat exchange medium and the battery monomer assembly and improve the thermal management capability of the battery device.

[0019] In some embodiments of the present application, the expansion beam has a plurality of first cavities, the first cavities extending from one end of the expansion beam to the other end, and at least one of the plurality of first cavities is set as the flow channel. The cavity of the expansion beam is used as the flow channel of the expansion beam, and the structure is simple. During the use of the battery device, the heat exchange medium flows through the flow channel of the expansion beam, and the temperature of the battery cell assembly can be controlled, so that the expansion beam surrounding the battery cell assembly participates in the thermal management of the battery cell assembly, thereby improving the thermal management capability of the battery device.

[0020] In some embodiments of the present application, the first box side wall and / or the second box side wall has a plurality of second cavities, the second cavities extend along the first direction, at least one of the plurality of second cavities is set as the flow channel, the first direction intersects with the second direction, and the second direction is the arrangement direction from the first box side wall to the second box side wall. The cavities of the first box side wall and the second box side wall are used as the flow channels of the box side walls, and the structure is simple. During the use of the battery device, the heat exchange medium flows through the flow channels of the first box side wall and the flow channels of the second box side wall, and the temperature of the battery cell assembly can be controlled, so that the box side wall surrounding the battery cell assembly participates in the thermal management of the battery cell assembly, thereby improving the thermal management capability of the battery device.

[0021] In some embodiments of the present application, the battery device further includes a bottom heat exchange assembly, the box body includes a box bottom wall, the box bottom wall is at least partially configured as the cavity bottom wall portion of the first accommodating cavity, and the bottom heat exchange assembly is disposed on the cavity bottom wall portion. The cavity bottom wall portion of the battery device is provided with a bottom heat exchange assembly, and the temperature of the battery cell assembly can be regulated from the bottom side, thereby improving the thermal management capability of the battery device. Moreover, the temperature of the battery cell assembly is regulated by the flow channel of the bottom heat exchange assembly and the cavity side wall portion, and the thermal management capability of the battery device can be effectively improved.

[0022] The second aspect of the present application proposes a battery system, including a thermal management device, the battery system also including a battery device proposed in the present application or any embodiment of the present application, the thermal management device is configured to provide a heat exchange medium to the battery device and control the temperature of the heat exchange medium; wherein the inlet is provided with an inlet joint, the outlet is provided with an outlet joint, the inlet joint is configured to be connected to the medium outlet of the thermal management device, and the outlet joint is configured to be connected to the medium inlet of the thermal management device.

[0023] The battery system of the present application has the beneficial effects of the battery device proposed in the present application or any embodiment of the present application.

[0024] The third aspect of the present application proposes an electrical device, which includes the battery device proposed in the present application or any embodiment of the present application, or the electrical device includes the battery system proposed in the present application or any embodiment of the present application.

[0025] The electrical equipment of the present application has the beneficial effects of the battery device proposed in the present application or any embodiment of the present application.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0029] Figure 2 A schematic diagram of a battery device according to some embodiments of the present application;

[0030] Figure 3 A schematic diagram of a battery cell proposed in some embodiments of the present application;

[0031] Figure 4 A schematic diagram of a partial structure of a box assembly according to some embodiments of the present application from one perspective;

[0032] Figure 5 for Figure 4 Enlarged view of the T section;

[0033] Figure 6 A schematic diagram of another perspective of a partial structure of a box assembly proposed in some embodiments of the present application;

[0034] Figure 7 for Figure 6 AA section view;

[0035] Figure 8 for Figure 6 BB cross-sectional view;

[0036] Fig. 9 for Figure 8 A magnified view of the P part;

[0037] Fig.10 for Figure 6 CC section view;

[0038] Fig.11 for Figure 6 DD cross-sectional view;

[0039] Fig.12 for Figure 6 EE cross-sectional view;

[0040] Fig.13 This is a schematic diagram of the structure of the box bottom wall proposed in some embodiments of the present application.

[0041] The reference numerals in the specific implementation manner are as follows:

[0042] 1000. Vehicles;

[0043] 100, battery device; 200, controller; 300, motor;

[0044] 10. Box assembly; 101. First accommodating chamber; 102. Second accommodating chamber; 103. Cavity side wall; 104. Cavity bottom wall; 105. Flow channel; 1051. First sub-flow channel; 1052. Second sub-flow channel; 1053. Third sub-flow channel; 1054. Fourth sub-flow channel; 1055. First communication port; 1056. Second communication port; 1057. Third communication port; 1058. Fourth communication port; 1059. Cavity channel; 106. Inlet; 107. Outlet; 108. Inlet connector; 109. Outlet connector;

[0045] 110, box body; 111, first box body; 112, second box body; 113, box top wall; 114, box bottom wall; 115, box side wall; 1151, first box side wall; 1152, second box side wall; 1153, fourth box side wall; 1154, second cavity; 1155, third cavity; 1156, first part; 1157, second part; 1158, mounting hole;

[0046] 120, expansion beam; 121, first expansion beam; 122, second expansion beam; 123, first cavity;

[0047] 130. Bottom heat exchange assembly;

[0048] 141. Sealing plate; 142. Sealing cover; 143. Sealing member;

[0049] 20. Battery cell assembly; 21. Battery cell; 22. Housing; 23. Shell; 24. End cap; 25. Electrode assembly; 26. Tab; 27. Electrode terminal;

[0050] X, first direction; Y, second direction; Z, height direction. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0054] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] Battery devices can store electrical energy and supply power to electrical equipment. With the development of new energy, the use of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0060] Temperature has a great influence on the performance of battery devices. If the temperature is too low, the battery activity will be reduced and may not be able to be charged or discharged. If the temperature is too high, there is a risk of thermal runaway. Therefore, the thermal management capability of the battery device is an important factor affecting the performance of the battery device. In some technologies, the battery device mainly relies on a cold plate set at the bottom for thermal management. Due to limited space, the cold plate is difficult to extend to the side of the battery device, and the side of the battery device is difficult to participate in the thermal management of the battery device, resulting in a relatively limited thermal management capability of the battery device. Moreover, if the battery device reserves space on the side to install a cold plate, the volume of the battery device will increase and the energy density of the battery device will decrease.

[0061] In order to alleviate the problem that the battery device has limited thermal management capabilities due to limited space and the side faces being difficult to participate in thermal management, the present application provides a battery device, wherein a flow channel is provided in the wall body of the side wall portion of the battery cavity (first accommodating cavity) surrounding the battery device to form a battery cavity, and the flow channel can allow heat exchange medium to flow.

[0062] During the use of the battery device, the heat exchange medium flows through the flow channel of the cavity side wall, which can control the temperature of the battery cell assembly, so that the cavity side wall surrounding the battery cell assembly participates in the thermal management of the battery cell assembly, thereby improving the temperature control capability of the battery device. At the same time, by arranging the flow channel in the wall body of the cavity side wall surrounding the battery cavity, the side of the battery device can participate in the thermal management of the battery device without or with fewer additional heat exchange components, resulting in a compact structure, small space occupation, and reduced impact on the energy density of the battery device.

[0063] The battery device disclosed in the embodiment of the present application can be used in, but is not limited to, electrical equipment such as vehicles, ships, or aircraft, and the power supply system of the electrical equipment can be composed of the battery device disclosed in the present application.

[0064] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0065] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0066] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0067] It is understandable that the battery device 100 can not only serve as an operating power source for the vehicle 1000 , but also serve as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0068] The battery apparatus mentioned in the embodiment of the present application may include one or more battery cell assemblies 20 for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 21, and the plurality of battery cells 21 are connected in series, in parallel or in mixed connection through a busbar component.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 21 .

[0070] As an example, the battery cell assembly 20 may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 21 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 21 by a cable tie.

[0071] like Figure 2 As shown, Figure 2 This is a schematic diagram of a battery device proposed in some embodiments of the present application. In some embodiments, the battery device 100 may be a battery pack, which includes a case 110 and one or more battery cell assemblies 20 , wherein the battery cell assemblies 20 are accommodated in the case 110 .

[0072] As an example, the battery cell assembly 20 may be accommodated in the case 110 by fixing the battery module in the case 110 .

[0073] As an example, the battery cell assembly 20 may also be accommodated in the case 110 by directly fixing the plurality of battery cells 21 to the case 110 .

[0074] As an example, Figure 2 As shown, the box 110 may include a first box 111 and a second box 112. The first box 111 and the second box 112 are buckled together to form a closed space inside the box 110 to accommodate the battery cell assembly 20. The closed space here means covered or closed, which can be sealed or unsealed. The first box 111 can be a top cover or a bottom plate.

[0075] As an example, the box body 110 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 a closed space is formed inside the box body 110 to accommodate the battery cell assembly 20.

[0076] In some embodiments, the box 110 may be a part of the chassis structure of the vehicle 1000. For example, a portion of the box 110 may become at least a portion of the floor of the vehicle 1000, or a portion of the box 110 may become at least a portion of the cross beam and longitudinal beam of the vehicle 1000.

[0077] In some embodiments, the battery device 100 refers to an energy storage device, which includes a cabinet, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0078] like Figure 3 As shown, Figure 3 This is a schematic diagram of a battery cell proposed in some embodiments of the present application. In the embodiments of the present application, the battery cell 21 may be a secondary battery. A secondary battery refers to a battery cell 21 that can be continuously used by activating active materials by charging after the battery cell 21 is discharged.

[0079] The battery cell 21 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0080] The battery cell 21 generally includes a housing 22, an electrode assembly 25 and an electrode terminal 27. The electrode terminal 27 is arranged on the housing 22, and the electrode assembly 25 is arranged in the housing 22. The electrode terminal 27 is electrically connected to the pole ear 26 of the electrode assembly 25. The electrode assembly 25 includes a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell 21, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0081] Exemplarily, the outer shell 22 of the battery cell 21 includes a shell 23 and an end cover 24 . The shell 23 is provided with an opening. The end cover 24 is covered on the shell 23 . The end cover 24 cooperates with the shell 23 to form an accommodating space. The electrode assembly 25 is arranged in the accommodating space. The electrode terminal 27 is arranged on the end cover 24 .

[0082] The battery device 100 may further include a battery management unit for monitoring and managing the battery device 100 , and may monitor information such as current, voltage, power or temperature of the battery cell 21 .

[0083] like Figure 2 and Figure 3 , and combined with Figures 4 to 12 As shown, Figure 4 A schematic diagram of a partial structure of a box assembly proposed in some embodiments of the present application from one perspective, Figure 5 for Figure 4 The enlarged view of the T section, Figure 6 This is a schematic diagram of another perspective of the partial structure of the box assembly proposed in some embodiments of the present application. Figure 7 for Figure 6 AA section view, Figure 8 for Figure 6 BB cross-sectional view, Fig. 9 for Figure 8 The enlarged view of the P part, Fig.10 for Figure 6 CC cross-sectional view, Fig.11 for Figure 6 DD cross-sectional view, Fig.12 for Figure 6 EE cross-sectional view, the present embodiment provides a battery device 100, including a box assembly 10 and a battery cell assembly 20, the box assembly 10 is surrounded by a first accommodating cavity 101, the box assembly 10 has a cavity side wall portion 103, the cavity side wall portion 103 is surrounded by the first accommodating cavity 101; the battery cell assembly 20 is arranged in the first accommodating cavity 101, the cavity side wall portion 103 is surrounded by the outer side of the battery cell assembly 20, along the circumference of the cavity side wall portion 103, the cavity side wall portion 103 at least partially has a wall body provided with a flow channel 105 for the flow of heat exchange medium, the cavity side wall portion 103 is provided with an inlet 106 and an outlet 107, the inlet 106 and the outlet 107 are both connected to the flow channel 105, the inlet 106 is used to allow the heat exchange medium to flow into the flow channel 105, and the outlet 107 is used to allow the heat exchange medium to flow out of the flow channel 105 after passing through the flow channel 105.

[0084] The box assembly 10 is a component that supports the battery device 100. The box assembly 10 may include a box 110 that forms the outer contour of the battery device 100 and auxiliary support members arranged in the box 110. The auxiliary support members may include an expansion beam 120 for resisting the expansion force of the battery cell assembly 20.

[0085] The first accommodating chamber 101 is a chamber for accommodating the battery cell assembly 20. The battery cell assembly 20 can be supported on the cavity bottom wall portion 104 of the first accommodating chamber 101, and the cavity side wall portion 103 is the side wall of the first accommodating chamber 101. The cavity side wall portion 103 is connected to the cavity bottom wall portion 104, and the cavity side wall portion 103 is arranged around the cavity bottom wall portion 104. Among them, the cavity side wall portion 103 and the cavity bottom wall portion 104 are both part of the box assembly 10, that is, the box assembly 10 is arranged to form the first accommodating chamber 101, wherein the portion of the box assembly 10 corresponding to the bottom of the first accommodating chamber 101 is defined as the cavity bottom wall portion 104, and the portion of the box assembly 10 corresponding to the side of the first accommodating chamber 101 is defined as the cavity side wall portion 103.

[0086] The battery cell assembly 20 is disposed in the first accommodating cavity 101 , and the cavity side wall portion 103 is surrounded on the outside of the battery cell assembly 20 . The battery cell assembly 20 and at least a portion of the cavity side wall portion 103 are disposed opposite to each other. During the use of the battery device 100 , the battery cell assembly 20 and the cavity side wall portion 103 can at least partially contact each other.

[0087] Illustratively, the cavity side wall portion 103 includes at least a portion of the box side wall 115 of the box body 110 .

[0088] Exemplarily, an expansion beam 120 is disposed in the box body 110 , and the expansion beam 120 is disposed at the end of the battery cell assembly 20 . The expansion beam 120 is disposed as a part of the cavity side wall portion 103 , that is, the cavity side wall portion 103 includes the expansion beam 120 .

[0089] For example, Figure 2 , Figures 4 to 6 As shown, the box side wall 115 of the box body 110 can be a frame structure, and the box side wall 115 is formed by connecting the first frame beam (refer to the first box side wall 1151), the second expansion beam 122, the second frame beam (refer to the second box side wall 1152), and the third frame beam (refer to the fourth box side wall 1153) end to end, and the first expansion beam 121 is arranged between the third frame beam and the second expansion beam 122, and the first expansion beam 121 divides the box body 110 into a first accommodating cavity 101 and a second accommodating cavity 102. Among them, the second expansion beam 122, the first expansion beam 121, and part of the first frame beam (refer to the first box side wall 1151) and part of the second frame beam (refer to the second box side wall 1152) arranged around the first accommodating cavity 101 form the cavity side wall portion 103.

[0090] Along the circumference of the cavity side wall 103, the cavity side wall 103 may be provided with a flow channel 105 in a partial area of ​​the wall, or may be provided with the flow channel 105 on the entire wall. The cross section of the flow channel 105 may be circular, square, or the like.

[0091] Exemplarily, the heat exchange medium may flow directly in the flow channel 105 .

[0092] Illustratively, a heat exchange tube may be disposed in the flow channel 105 , and the heat exchange medium flows in the heat exchange tube in the flow channel 105 .

[0093] The heat exchange medium is a fluid that can flow, which can be a gas or a liquid, etc. The heat exchange medium can flow into the flow channel 105 from the inlet 106. In the flow channel 105, the heat exchange medium exchanges heat with the battery cell assembly 20 through the cavity side wall 103, and then flows out from the outlet 107 of the flow channel 105. The heat exchange medium can be provided by a thermal management device, which controls the temperature of the heat exchange medium. When the battery device 100 needs to cool down, a heat exchange medium with a lower temperature is transported into the flow channel 105. When the battery device 100 needs to heat up, a heat exchange medium with a lower temperature is transported into the flow channel 105.

[0094] For example, the flow channel 105 may extend along the circumference of the cavity sidewall portion 103 .

[0095] Exemplarily, the flow channel 105 and the heat exchange medium flow channel 105 of the thermal management device can form a medium circulation flow channel 105 to circulate the medium.

[0096] The heat exchange medium can be water, and the thermal management device can heat and cool the water.

[0097] Exemplarily, the heat exchange medium can be set to a refrigerant (commonly known as refrigerant, which can specifically include Freon, alkane, ammonia, carbon dioxide, etc.), and the thermal management device can be set to a refrigeration cycle system or a heat pump system, and the temperature of the refrigerant delivered to the flow channel 105 is controlled by the refrigeration cycle system.

[0098] In the battery device 100 of this embodiment, a flow channel 105 is provided in the wall body of the cavity side wall portion 103 surrounding the battery cell assembly 20, and the flow channel 105 can be used for the flow of heat exchange medium. During the use of the battery device 100, the heat exchange medium flows through the flow channel 105 of the cavity side wall portion 103, and the temperature of the battery cell assembly 20 can be controlled, so that the cavity side wall portion 103 surrounding the battery cell assembly 20 participates in the thermal management of the battery cell assembly 20, thereby improving the temperature control capability (i.e., thermal management capability) of the battery device 100. In addition, by providing the flow channel 105 in the wall body of the cavity side wall portion 103 surrounding the battery cavity, the side of the battery device 100 can participate in the thermal management of the battery device 100 without or with less provision of additional heat exchange components, and the structure is compact, the space occupied is small, and the impact on the energy density of the battery device 100 is reduced.

[0099] According to some embodiments of the present application, optionally, along the height direction Z of the battery device 100, the flow dimension of the flow channel 105 is 50% to 90% of the height dimension L of the cavity side wall portion 103 of the corresponding area of ​​the flow channel 105, and the height dimension L of the cavity side wall portion 103 is the dimension between the top end surface and the bottom end surface of the cavity side wall portion 103.

[0100] The height direction Z of the battery device 100 is the direction from the top wall 113 to the bottom wall 114 of the battery device 100 . The cavity side wall portion 103 is disposed between the top wall 113 and the bottom of the battery device 100 , and the cavity side wall portion 103 extends along the height direction Z of the battery device 100 .

[0101] The “flow size of the flow channel 105” refers to the sum of the sizes of all the flow channels 105 corresponding to the same area along the height direction Z of the battery device 100, that is, the sum of the sizes of all the flow channels 105 located on the same straight line (a straight line extending along the height direction Z) along the height direction Z of the battery device 100. For example, Figure 8 and Fig. 9As shown, three flow channels 105 are provided in the second expansion beam 122 . The three flow channels 105 are arranged in sequence along the height direction Z. The flow dimension of the flow channel 105 is the sum of the dimensions L1 , L2 , and L3 of the three flow channels 105 along the height direction Z.

[0102] The flow dimension of the flow channel 105 is 50% to 90% of the height dimension L of the cavity side wall portion 103 in the corresponding area of ​​the flow channel 105. It can be understood that the flow dimension of the flow channel 105 can account for 50% to 90% of the height of the cavity side wall portion 103 in the corresponding area.

[0103] Exemplarily, the flow dimension of the flow channel 105 is 50%, 60%, 70%, 80%, or 90% of the height dimension of the cavity side wall portion 103 in the area corresponding to the flow channel 105 .

[0104] It is understandable that the larger the flow size of the flow channel 105 is, the more beneficial it is to improve the thermal management capability of the battery cell assembly 20. Under the condition of meeting the support strength requirements of the cavity side wall portion 103, the flow size of the flow channel 105 can be designed to be as large as possible.

[0105] In this embodiment, the flow dimension of the flow channel 105 is 50% to 90% of the height dimension L of the cavity side wall portion 103 in the area corresponding to the flow channel 105, which can not only make the cavity side wall portion 103 have better supporting strength, but also allow a larger area of ​​the cavity side wall portion 103 to participate in the thermal management of the battery device 100, thereby improving the thermal management capability of the battery device 100.

[0106] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the box assembly 10 includes an expansion beam 120, and the expansion beam 120 is arranged at at least one end of the battery cell assembly 20. The expansion beam 120 is arranged as a part of the cavity side wall portion 103. The expansion beam 120 is used to resist the expansion force of the battery cell assembly 20, and a flow channel 105 is arranged in the beam body of the expansion beam 120.

[0107] The expansion beam 120 is arranged around the first accommodating cavity 101, and it constitutes a part of the cavity side wall portion 103. The expansion beam 120 can be a strip-shaped block or plate-shaped structure, and the expansion beam 120 can be processed by a variety of processes, specifically, it can be a profile expansion beam, a roll-pressed expansion beam, a sheet metal expansion beam, a die-cast expansion beam, etc. During the charging and discharging process of the battery cell 21, the expansion beam 120 is used to abut against the battery cell assembly 20 to provide support for the battery cell assembly 20, resist the expansion force of the battery cell assembly 20, and reduce the possibility of failure of the battery device 100. The expansion beam 120 can be set at the end of the battery cell assembly 20 in the direction where the expansion force is the largest.

[0108] Exemplarily, the expansion beam 120 may be disposed in the box body 110 and fixedly connected to the box body 110 , and the expansion beam 120 is located on the inner side of the side wall of the box body 110 .

[0109] Exemplarily, the expansion beam 120 may also serve as the box side wall 115 of the box body 110 . For example, one or two opposite box side walls 115 of the box body 110 are configured as the expansion beam 120 .

[0110] The battery cell assembly 20 may be provided with an expansion beam 120 at one end thereof, or the battery cell assembly 20 may be provided with expansion beams 120 at two opposite ends thereof.

[0111] For example, Figures 4 to 6 As shown, the first expansion beam 121 is disposed in the box body 110 , and the second expansion beam 122 serves as a box side wall 115 on one side of the box body 110 .

[0112] For example, Figure 2 As shown, the multiple battery cells 21 of the battery cell assembly 20 are arranged in rows in sequence along a first direction X, the first direction X may be the length direction of the battery device 100, and the expansion beam 120 is disposed at the end of the battery cell assembly 20 along the first direction X. Optionally, the battery cell assembly 20 is arranged into multiple columns of battery cells 21 along a second direction Y, each column of battery cells 21 includes multiple battery cells 21 arranged along the first direction X, and the second direction Y may be the width direction of the battery device 100.

[0113] The flow channel 105 in the expansion beam 120 may be a single-flow flow channel 105, and the heat exchange medium in the flow channel 105 of the expansion beam 120 flows from one end of the expansion beam 120 to the other end before being discharged. The flow channel 105 in the expansion beam 120 may be a multi-flow flow channel 105, and the flow channel 105 of each flow includes at least one flow channel 105, and the outlet of the flow channel 105 of the upstream flow is connected to the inlet of the flow channel 105 of the downstream flow, and the heat exchange medium in the flow channel 105 of the expansion beam 120 first flows from the first end of the expansion beam 120 to the second end to complete a flow, and then flows from the second end to the first end to complete the second flow, and is discharged after reciprocating and zigzag flow.

[0114] When the flow channel 105 in the expansion beam 120 is set as an odd-numbered flow path, the inlet 106 and the outlet 107 can be set at both ends of the expansion beam 120; when the flow channel 105 in the expansion beam 120 is set as an even-numbered flow path, the expansion beam 120 can be provided with an outlet 107 and an inlet 106 isolated from each other at the same end. In the case where only the flow channel 105 is provided in the expansion beam 120, along the flow direction of the heat exchange medium, the inlet of the flow channel 105 of the most upstream flow path can be set as the inlet 106, and the outlet of the flow channel 105 of the most downstream flow path can be set as the outlet 107, and the inlet 106 and the outlet 107 can both be provided on the expansion beam 120.

[0115] Exemplarily, the battery cell 21 may be a square battery. The battery cell 21 has a largest surface whose area is larger than areas of other surfaces of the battery cell 21 . The largest surface of the battery cell 21 faces the expansion beam 120 .

[0116] The expansion beam 120 may abut against the battery cell assembly 20 . In this embodiment, by providing a flow channel 105 in the expansion beam 120 , the heat exchange medium may directly exchange heat with the battery cell assembly 20 through the expansion beam 120 , thereby improving the thermal management capability of the battery device 100 .

[0117] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the box assembly 10 includes a box 110 and a first expansion beam 121. The first expansion beam 121 is arranged in the box 110 and isolates the box 110 into a first accommodating cavity 101 and a second accommodating cavity 102. The second accommodating cavity 102 accommodates the electronic control component of the battery device 100 (not shown in the figure), and a flow channel is arranged in the first expansion beam 121.

[0118] The first expansion beam 121 is disposed around the first accommodating cavity 101 and is located at one end of the battery cell assembly 20 facing the second accommodating cavity 102. The first expansion beam 121 constitutes part of the cavity side wall portion 103. The first expansion beam 121 can extend along the second direction Y (i.e., the width direction of the battery device), and both ends of the first expansion beam 121 can be fixedly connected to the box body 110.

[0119] The electric control assembly is a collection of conversion and control components of the battery device 100, which may include an electric control box, etc., in which a battery circuit unit, a high-low voltage conversion module, etc. are arranged. The battery cell assembly 20 is electrically connected to the electric control assembly.

[0120] In this embodiment, by providing the flow channel 105 in the first expansion beam 121 , the heat exchange medium can directly exchange heat with the battery cell assembly 20 through the first expansion beam 121 , thereby improving the thermal management capability of the battery device 100 .

[0121] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the box assembly 10 includes a box body 110, and the box body 110 includes a first box side wall 1151 and a second box side wall 1152 arranged opposite to each other, at least a portion of the first box side wall 1151 and at least a portion of the second box side wall 1152 are respectively arranged as partial cavity side wall portions 103, and both ends of the expansion beam 120 are respectively connected to the first box side wall 1151 and the second box side wall 1152, and a flow channel 105 is arranged in the wall body of the first box side wall 1151 and / or the wall body of the second box side wall 1152.

[0122] The first box side wall 1151 and the second box side wall 1152 are part of the structure of the box body 110. The first box side wall 1151 and the second box side wall 1152 are located between the box top wall 113 and the box bottom wall 114 of the box body 110, and are arranged opposite to each other along the second direction Y. The top of the first box side wall 1151 and the top of the second box side wall 1152 are respectively connected to the box top wall 113, and the bottom of the first box side wall 1151 and the bottom of the second box side wall 1152 are respectively connected to the box bottom wall 114. Along the second direction Y, the first accommodating cavity 101 and the battery monomer assembly 20 are both arranged between the first box side wall 1151 and the second box side wall 1152.

[0123] The first box side wall 1151 and the second box side wall 1152 can cooperate with the expansion beam 120 to enclose and form the first accommodating cavity 101. At least part of the first box side wall 1151 and at least part of the second box side wall 1152 are respectively set as partial cavity side wall portions 103. It can be understood that the first box side wall 1151 and the second box side wall 1152 are at least partially enclosed in the first accommodating cavity 101, and the first box side wall 1151 and the second box side wall 1152 enclose the part of the first accommodating cavity 101 as the partial cavity side wall portion 103.

[0124] Exemplarily, the first box side wall 1151 and the second box side wall 1152 may be configured as a frame beam structure. The first box side wall 1151 and the second box side wall 1152 may be substantially axially symmetrically configured.

[0125] Exemplarily, a flow channel 105 is provided in the wall body of the first box side wall 1151, which is defined as a third sub-flow channel 1053 for the sake of ease of description. The area of ​​the first box side wall 1151 surrounding the first accommodating cavity 101 can be provided with the third sub-flow channel 1053, and other areas of the first box side wall 1151 (for example, the area surrounding the second accommodating cavity 102) can also be provided with the third sub-flow channel 1053.

[0126] Exemplarily, a flow channel 105 is provided in the wall of the second box side wall 1152, which is defined as a fourth sub-flow channel 1054 for the sake of ease of description. The area of ​​the second box side wall 1152 surrounding the first accommodating cavity 101 can be provided with the fourth sub-flow channel 1054, and other areas of the first box side wall 1151 (such as the area surrounding the second accommodating cavity 102) can also be provided with the fourth sub-flow channel 1054.

[0127] The flow channel 105 in the expansion beam 120 (for ease of understanding, the flow channel 105 in the second expansion beam 122 is defined as the second sub-flow channel 1052, and the flow channel 105 in the first expansion beam 121 is defined as the first sub-flow channel 1051), the flow channel 105 of the first box side wall 1151 (refer to the third sub-flow channel 1053), and the flow channel 105 of the second box side wall 1152 (refer to the fourth sub-flow channel 1054) can be arranged in parallel with each other, and the heat exchange medium from the thermal management device can flow through the second sub-flow channel 1052, the first sub-flow channel 1051, the third sub-flow channel 1053 and the fourth sub-flow channel 1054 respectively and then flow back to the thermal management device.

[0128] The flow channel 105 in the expansion beam 120 (refer to the second sub-flow channel 1052 and the first sub-flow channel 1051), the flow channel 105 of the first box side wall 1151 (refer to the third sub-flow channel 1053), and the flow channel 105 of the second box side wall 1152 (refer to the fourth sub-flow channel 1054) can be arranged in series in whole or in part, and the heat exchange medium from the thermal management device can flow back to the thermal management device after passing through the flow channels 105 arranged in series in sequence.

[0129] Exemplarily, the flow channel 105 in the first box side wall 1151 can be set as a single-flow flow channel 105, or can be set as a multi-flow flow channel 105. Among them, the flow from one end of the first box side wall 1151 to the other end is one flow.

[0130] Exemplarily, the flow channel 105 in the second box side wall 1152 can be set as a single-flow flow channel 105, or can be set as a multi-flow flow channel 105. Among them, the flow from one end of the second box side wall 1152 to the other end is one flow.

[0131] By setting the flow channel 105 in the first box side wall 1151 and the second box side wall 1152, when the heat exchange medium flows through the flow channel 105 of the first box side wall 1151 and the second box side wall 1152, the temperature of the battery cell assembly 20 can be controlled, so that the box side wall 115 of the battery device 100 participates in the thermal management of the battery cell assembly 20, thereby improving the temperature control capability of the battery device 100.

[0132] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12As shown, the flow channel 105 of the expansion beam 120 is connected to the flow channel 105 of the first box side wall 1151 and / or the flow channel 105 of the second box side wall 1152 .

[0133] Exemplarily, the flow channel 105 of the expansion beam 120 (understood with reference to the second sub-flow channel 1052 and the first sub-flow channel 1051) can be connected with the flow channel 105 of the first box side wall 1151 (understood with reference to the third sub-flow channel 1053), so that the flow channel 105 of the expansion beam 120 and the flow channel 105 of the first box side wall 1151 are connected in series, and the heat exchange medium can flow from the flow channel 105 of the expansion beam 120 to the flow channel 105 of the first box side wall 1151 or flow through the flow channel 105 of the first box side wall 1151 to the flow channel 105 of the expansion beam 120. Corresponding to the flow channel 105 of the expansion beam 120 and the flow channel 105 of the first box side wall 1151, the cavity side wall portion 103 can be provided with only one inlet 106 and one outlet 107 connected with the thermal management device, which has a simple structure and convenient component arrangement. The inlet 106 can be arranged on the expansion beam 120 or the first box side wall 1151, and the outlet 107 can be arranged on the expansion beam 120 or the first box side wall 1151. It should be noted that the inlet 106 and the outlet 107 should be arranged so that after the heat exchange medium flows in from the inlet 106, it needs to flow through the flow channel 105 of the first box side wall 1151 and the flow channel 105 of the expansion beam 120 before it can flow out from the outlet 107.

[0134] Exemplarily, the flow channel 105 of the expansion beam 120 (understood by referring to the first sub-flow channel 1051 and the first sub-flow channel 1051) can be connected with the flow channel 105 of the second box side wall 1152 (understood by referring to the fourth sub-flow channel 1054), so that the flow channel 105 of the expansion beam 120 and the flow channel 105 of the second box side wall 1152 are connected in series, and the heat exchange medium can flow from the flow channel 105 of the expansion beam 120 to the flow channel 105 of the second box side wall 1152 or flow through the flow channel 105 of the second box side wall 1152 to the flow channel 105 of the expansion beam 120. Corresponding to the flow channel 105 of the expansion beam 120 and the flow channel 105 of the second box side wall 1152, the cavity side wall portion 103 is only provided with one inlet 106 and one outlet 107 connected with the thermal management device, which has a simple structure and convenient component arrangement. The inlet 106 can be arranged on the expansion beam 120 or the first box side wall 1151, and the outlet 107 can be arranged on the expansion beam 120 or the first box side wall 1151. It should be noted that the inlet 106 and the outlet 107 should be arranged so that after the heat exchange medium flows in from the inlet 106, it needs to flow through the flow channel 105 of the second box side wall 1152 and the flow channel 105 of the expansion beam 120 before it can flow out from the outlet 107.

[0135] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12As shown, the wall body of the first box side wall 1151 and the wall body of the second box side wall 1152 are both provided with flow channels 105, and the flow channel 105 of the first box side wall 1151, the flow channel 105 of the expansion beam 120 and the flow channel 105 of the second box side wall 1152 are connected in series.

[0136] Exemplarily, an inlet 106 is provided on the first box side wall 1151, and the inlet 106 is the inlet of the flow channel 105 (the third sub-channel 1053) of the first box side wall 1151. An outlet 107 is provided on the second box side wall 1152, and the outlet 107 is the outlet of the flow channel 105 (the fourth sub-channel 1054) of the second box side wall 1152. The heat exchange medium flows into the flow channel 105 (the third sub-channel 1053) of the first box side wall 1151 from the inlet 106 of the first box side wall 1151, and then flows to the inlet of the flow channel 105 of the expansion beam 120 through the outlet of the third sub-channel 1053, flows out from the outlet of the flow channel 105 of the expansion beam 120, flows into the inlet of the flow channel 105 (the fourth sub-channel 1054) of the second box side wall 1152, and finally flows out through the outlet 107 on the second box side wall 1152.

[0137] The flow channel 105 of the first box side wall 1151, the flow channel 105 of the expansion beam 120 and the flow channel 105 of the second box side wall 1152 are connected in series. In this way, corresponding to the flow channel 105 of the expansion beam 120, the flow channel 105 of the first box side wall 1151 and the flow channel 105 of the second box side wall 1152, the cavity side wall portion 103 only needs to be provided with one inlet 106 and one outlet 107 connected to the thermal management device, so the structure is simple and the component arrangement is convenient.

[0138] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the expansion beam 120 includes a first expansion beam 121 and a second expansion beam 122. Along the first direction X, the first expansion beam 121 and the second expansion beam 122 are arranged relative to each other and spaced apart. The battery cell assembly 20 is arranged between the second expansion beam 122 and the first expansion beam 121. The flow channel 105 is respectively arranged in the beam body of the second expansion beam 122 and the beam body of the first expansion beam 121. The flow channel 105 of the first box side wall 1151, the flow channel 105 of the second expansion beam 122, the flow channel 105 of the second box side wall 1152 and the flow channel 105 of the first expansion beam 121 are connected in series. The first direction X intersects with the second direction Y. The second direction Y is the arrangement direction from the first box side wall 1151 to the second box side wall 1152.

[0139] The first expansion beam 121 and the second expansion beam 122 are respectively located at two ends of the battery cell assembly 20 along the first direction.

[0140] Exemplarily, the first expansion beam 121 and the second expansion beam 122 can be both disposed in the box body 110, and respectively connected between the first box side wall 1151 and the second box side wall 1152. In this solution, the box side wall 115 includes the first box side wall 1151, the third box side wall, the second box side wall 1152 and the fourth box side wall 1153 connected end to end in sequence, wherein the third box side wall and the fourth box side wall 1153 are disposed opposite to each other along the first direction X, and along the first direction X, the first expansion beam 121 and the second expansion beam 122 are both located between the third box side wall and the fourth box side wall 1153.

[0141] For example, Figure 4 and Figure 6 As shown, the second expansion beam 122 may also be connected to the end of the same end of the first box side wall 1151 and the second box side wall 1152 , and be set as a partial box side wall of the box body 110 .

[0142] The inlet 106 or the outlet 107 can be set on any one of the first box side wall 1151, the second box side wall 1152, the second expansion beam 122 and the first expansion beam 121, as long as it can be met that the heat exchange medium flowing in from the inlet 106 can flow along the circumference of the cavity side wall portion 103 through the flow channel 105 of the first box side wall 1151, the flow channel 105 of the second expansion beam 122, the flow channel 105 of the second box side wall 1152 and the flow channel 105 of the first expansion beam 121, and the order in which the heat exchange medium flows through these four flow channels 105 can be changed.

[0143] Exemplarily, the inlet 106 and the outlet 107 can both be set on the first expansion beam 121, and the inlet 106 and the outlet 107 are set isolated from each other. The heat exchange medium flowing in from the inlet 106 flows into the flow channel 105 of the first box side wall 1151 (refer to the third sub-channel 1053) from the side of the first expansion beam 121 where the inlet 106 is set, flows through the flow channel 105 of the second expansion beam 122 (refer to the second sub-channel 1052), and the flow channel 105 of the second box side wall 1152 (refer to the fourth sub-channel 1054) in sequence, and then flows back to the area where the outlet 107 is set on the first expansion beam 121, and flows out through the outlet 107.

[0144] The flow channel 105 of the first box side wall 1151, the flow channel 105 of the second expansion beam 122, the flow channel 105 of the second box side wall 1152, and the flow channel 105 of the fourth expansion beam 120 are connected in series. In this way, corresponding to the flow channel 105 of the first box side wall 1151, the flow channel 105 of the second expansion beam 122, the flow channel 105 of the second box side wall 1152, and the flow channel 105 of the fourth expansion beam 120, the cavity side wall portion 103 only needs to be provided with an inlet 106 and an outlet 107 connected to the thermal management device, with a simple structure and convenient component arrangement.

[0145] According to some embodiments of the present application, optionally, Figure 2 , Figure 4 , Figure 6 As shown, the second expansion beam 122 is connected to the end of the first box side wall 1151 and the end of the second box side wall 1152, and the second expansion beam 122 is connected to the same end of the first box side wall 1151 and the second box side wall 1152, and the second expansion beam is set as a partial box side wall of the box body.

[0146] Exemplarily, along the first direction X, the second expansion beam 122 is connected to the first box side wall 1151 and the second box side wall 1152 at one end away from the second accommodating cavity 102, and is set as the third box side wall of the box body 110. That is, the first box side wall 1151, the second expansion beam 122, the second box side wall 1152 and the fourth box side wall 1153 form the box side wall 115 from end to end.

[0147] In this embodiment, the second expansion beam 122 is directly set as a part of the box side wall 115, which has a compact structure and is beneficial to improving the energy density of the battery device 100.

[0148] According to some embodiments of the present application, optionally, the outflow port 107 is connected to the inlet of the flow channel 105 of the first box side wall 1151 , the outflow port 107 is arranged on the first expansion beam 121 , and the flow channel 105 of the first expansion beam 121 is connected to the outflow port 107 .

[0149] The inlet 106 can be arranged on the first box side wall 1151, or can be arranged on other areas of the box side wall 115 near the first box side wall 1151. The inlet 106 is arranged on the first box side wall 1151, and the inlet 106 can serve as the inlet of the flow channel 105 (third sub-flow channel 1053) of the first box side wall 1151. The first expansion beam 121 is provided with an outlet 107, which is the outlet of the flow channel 105 (refer to the first sub-flow channel 1051) in the first expansion beam 121.

[0150] The heat exchange medium can flow into the flow channel 105 (third sub-channel 1053) of the first box side wall 1151 from the inlet 106 of the first box side wall 1151, and then flow to the inlet of the flow channel 105 (second sub-channel 1052) of the second expansion beam 122 through the outlet of the third sub-channel 1053, and after flowing out from the outlet of the flow channel 105 of the second expansion beam 122, flow into the inlet of the flow channel 105 (fourth sub-channel 1054) of the second box side wall 1152, and then flow from the outlet of the flow channel 105 (fourth sub-channel 1054) of the second box side wall 1152 to the flow channel 105 (first sub-channel 1051) of the first expansion beam 121, and finally flow out through the flow outlet 107 on the first expansion beam 121.

[0151] The inlet 106 is connected to the inlet of the flow channel 105 of the first box side wall 1151, and the outlet 107 is arranged on the first expansion beam 121, so that the heat exchange medium can flow through the flow channel 105 of the first box side wall 1151, the flow channel 105 of the second expansion beam 122, the flow channel 105 of the second box side wall 1152 and the flow channel 105 of the first expansion beam 121, and the structural arrangement is simple and the components are not easy to interfere with each other.

[0152] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the battery device 100 further includes an inlet connector 108 and an outlet connector 109 . The inlet connector 108 is connected to the periphery of the inlet 106 and communicates with the inlet 106 . The outlet connector 109 is connected to the periphery of the outlet 107 and communicates with the outlet 107 .

[0153] The inlet joint 108 is sealed with the inlet 106. For example, the inlet joint 108 and the periphery of the inlet 106 can be welded into an integral structure. For another example, the inlet joint 108 and the periphery of the inlet 106 are sealed with a sealing ring. Optionally, the inlet joint 108 can protrude from the side wall portion 103 of the cavity where it is located, and the inlet joint 108 can be used to connect and communicate with the medium outlet of the heat exchange system.

[0154] The outlet joint 109 is sealed with the outlet 107. For example, the outlet joint 109 and the periphery of the outlet 107 can be welded into an integral structure. For another example, the outlet joint 109 and the periphery of the inlet and outlet are sealed with a sealing ring. Optionally, the outlet joint 109 can protrude from the side wall portion 103 of the cavity where it is located. The outlet joint 109 can be used to connect and communicate with the medium inlet of the heat exchange system.

[0155] The inlet connector 108 and the outlet connector 109 facilitate the connection between the battery device 100 and the heat exchange system.

[0156] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the battery device 100 also includes an inlet connector 108 and an outlet connector 109, the inlet 106 is arranged on the first expansion beam 121 or the box side wall 115 of the box body 110 surrounding the second accommodating cavity 102, the inlet connector 108 is connected to the periphery of the inlet 106 and communicates with the inlet 106, the outlet 107 is arranged on the first expansion beam 121 or the box side wall 115 of the box body 110 surrounding the second accommodating cavity 102, and the outlet connector 109 is connected to the periphery of the outlet 107 and communicates with the outlet 107.

[0157] The setting position of the inlet joint 108 corresponds to the setting position of the inlet 106, and the position limit of the inlet joint 108 is also the position limit of the inlet 106. The setting position of the outlet joint 109 corresponds to the setting position of the outlet 107, and the position limit of the outlet joint 109 is also the position limit of the outlet 107.

[0158] The box body 110 encloses the box side wall 115 of the second accommodating cavity 102 , which refers to the area enclosed by the box side wall 115 to form the second accommodating cavity 102 .

[0159] For example, Figures 4 to 6 As shown, the outflow port 107 and the outlet joint 109 may be disposed on a side of the first expansion beam 121 facing the second accommodating cavity 102 .

[0160] For example, Figure 2 , Figures 4 to 12 As shown, the inlet 106 and the inlet joint 108 can be arranged at the end of the fourth box side wall 1153. The end of the fourth box side wall 1153 is provided with a cavity 1059, and the inlet 106 is connected to the inlet of the flow channel 105 of the first side box body 110 through the cavity 1059.

[0161] Exemplarily, the inlet port 106 and the inlet connector 108 may be disposed at an end of the first side box body 110 corresponding to the second accommodating chamber 102 .

[0162] The inlet connector 108 and the outlet connector 109 are both arranged at a position of the box body 110 or the expansion beam 120 close to the second accommodating chamber 102. The inlet connector 108 and the outlet connector 109 basically do not occupy the space of the battery cell assembly 20, which is beneficial to improving the rationality of the component layout and facilitating the assembly of the inlet connector 108 and the outlet connector 109 with the thermal management device respectively.

[0163] According to some embodiments of the present application, optionally, Figure 2 , Figures 4 to 12 As shown, the first box side wall 1151 and / or the second box side wall 1152 include a first portion 1156 and a second portion 1157 that are connected to each other, the first portion 1156 is arranged around the first accommodating cavity 101, the second portion 1157 is arranged on the side of the corresponding first portion 1156 away from the first accommodating cavity 101, and the first portion 1156 is provided with a flow channel 105.

[0164] Illustratively, the first box side wall 1151 and the second box side wall 1152 include a first portion 1156 and a second portion 1157 , respectively.

[0165] The first portion 1156 and the corresponding second portion 1157 are substantially vertically arranged, and the second portion 1157 is located outside the first portion 1156. The second portion 1157 can be formed by extending the bottom end of the first portion 1156 outward.

[0166] Exemplarily, the first portion 1156 and the second portion 1157 may be integrally formed or welded into an integral structure.

[0167] The second portion 1157 can be used to fix relative to an electrical device, etc. For example, the battery device 100 can be installed on the chassis of the vehicle 1000 by using the second portion 1157 in conjunction with a fastening assembly.

[0168] The first portion 1156 is a portion of the first box side wall 1151 and the second box side wall 1152 close to the battery cell assembly 20. Setting the flow channel 105 in the first portion 1156 of the first box side wall 1151 and the first portion 1156 of the second box side wall 1152 can improve the heat exchange efficiency between the heat exchange medium and the battery cell assembly 20, and improve the thermal management capability of the battery device 100.

[0169] According to some embodiments of the present application, optionally, Figures 8 to 10 As shown, the expansion beam 120 has a plurality of first cavities 123 , and the first cavity 123 extends from one end of the expansion beam 120 to the other end. At least one first cavity 123 among the plurality of first cavities 123 is configured as a flow channel 105 .

[0170] The second expansion beam 122 and the first expansion beam 121 may be respectively provided with a plurality of first cavities 123, specifically two, three or more. The first cavity 123 is a cavity structure formed during the processing of the second expansion beam 122 and the first expansion beam 121, which may be a structure of a conventional expansion beam 120. At least one of the plurality of first cavities 123 is provided as a flow channel 105, that is, the cavity of the expansion beam 120 itself may be used as the flow channel 105 in the expansion beam 120.

[0171] The first cavity 123 may extend from one end of the expansion beam 120 to the other end along the second direction Y (the width direction of the battery device 100 ). Both ends of the expansion beam 120 along the second direction Y may be sealed to the first box sidewall 1151 and the second box sidewall 1152 to seal each first cavity 123 .

[0172] This embodiment utilizes the mold cavity of the expansion beam 120 as the flow channel 105 of the expansion beam 120 and has a simple structure. During the use of the battery device 100, the heat exchange medium flows through the flow channel 105 of the expansion beam 120, and the temperature of the battery cell assembly 20 can be controlled, so that the expansion beam 120 surrounding the battery cell assembly 20 participates in the thermal management of the battery cell assembly 20, thereby improving the thermal management capability of the battery device 100.

[0173] According to some embodiments of the present application, optionally, Fig.11 and Fig.12 As shown, the first box side wall 1151 and / or the second box side wall 1152 has a plurality of second cavities 1154, and the second cavities 1154 extend along the first direction X. At least one second cavity 1154 among the plurality of second cavities 1154 is configured as a flow channel 105. The first direction X intersects with the second direction Y, and the second direction Y is the arrangement direction from the first box side wall 1151 to the second box side wall 1152.

[0174] Exemplarily, the first box sidewall 1151 and the second box sidewall 1152 respectively have a plurality of second cavities 1154, specifically two, three or more. The second cavity 1154 is a cavity structure formed during the processing of the first box sidewall 1151 and the second box sidewall 1152, which may be a structure of a conventional box sidewall 115. At least one second cavity 1154 among the plurality of second cavities 1154 is set as a flow channel 105, that is, the cavity of the first box sidewall 1151 and the second box sidewall 1152 itself can be used as the flow channel 105 in the first box sidewall 1151 and the second box sidewall 1152.

[0175] The battery device 100 of this embodiment utilizes the cavities of the first box side wall 1151 and the second box side wall 1152 as the flow channel 105 of the box side wall 115, and has a simple structure. During the use of the battery device 100, the heat exchange medium flows through the flow channel 105 of the first box side wall 1151 and the flow channel 105 of the second box side wall 1152, and the temperature of the battery cell assembly 20 can be controlled, so that the box side wall 115 surrounding the battery cell assembly 20 participates in the thermal management of the battery cell assembly 20, thereby improving the thermal management capability of the battery device 100.

[0176] According to some embodiments of the present application, optionally, Fig.13 As shown, Fig.13 This is a schematic diagram of the structure of the bottom wall of the box proposed in some embodiments of the present application. The battery device 100 also includes a bottom heat exchange component 130. The box body 110 includes a bottom wall 114. The bottom wall 114 is at least partially configured as a cavity bottom wall portion 104 of the first accommodating cavity 101. The bottom heat exchange component 130 is configured on the cavity bottom wall portion 104.

[0177] The bottom heat exchange assembly 130 may include a heat exchange channel. Exemplarily, the bottom heat exchange assembly 130 may be a structure such as a heat exchange plate provided with heat exchange tubes, and the heat exchange tubes form a heat exchange channel. The channel inlet and the channel outlet of the heat exchange channel may also be connected to the thermal management device, and the heat exchange medium flows through the heat exchange channel to perform thermal management on the battery cell 21 from the bottom of the battery cell assembly 20.

[0178] Exemplarily, the bottom heat exchange component 130 and the flow channel 105 of the cavity side wall portion 103 may be connected in parallel to the thermal management device, that is, the heat exchange medium may flow through the bottom heat exchange component 130 and the flow channel 105 of the cavity side wall portion 103 independently.

[0179] Exemplarily, the bottom heat exchange component 130 and the flow channel 105 of the cavity side wall portion 103 can also be connected in series to the thermal management device, that is, the heat exchange medium can flow through the bottom heat exchange component 130 and the flow channel 105 of the cavity side wall portion 103 in sequence and then flow to the medium inlet of the thermal management device, or the heat exchange medium can flow through the flow channel 105 of the cavity side wall portion 103 and the bottom heat exchange component 130 in sequence and then flow to the medium inlet of the thermal management device.

[0180] The bottom wall portion 104 of the battery device 100 is provided with a bottom heat exchange assembly 130, which can control the temperature of the battery cell assembly 20 from the bottom side, thereby improving the thermal management capability of the battery device 100. In addition, the bottom heat exchange assembly 130 and the flow channel 105 of the cavity side wall portion 103 jointly control the temperature of the battery cell assembly 20, thereby effectively improving the thermal management capability of the battery device 100.

[0181] like Figure 2 , Figures 4 to 12As shown, this embodiment provides a battery device 100, including a box assembly 10 and a battery cell assembly 20, the box assembly 10 includes a box 110 and a first expansion beam 121, the box 110 includes a box top wall 113, a box bottom wall 114 and a box side wall 115, the box top wall 113 and the box bottom wall 114 are relatively arranged along the height direction Z of the battery device 100, the box side wall 115 is connected between the box top wall 113 and the box bottom wall 114, and the box side wall 115 includes a first box side wall 1151, a second expansion beam 122, a second box side wall 1152 and a fourth box side wall 1151 connected in sequence end to end. Box side wall 1153, wherein the first box side wall 1151 and the second box side wall 1152 are arranged opposite to each other along the second direction Y, the second expansion beam 122 and the fourth box side wall 1153 are arranged opposite to each other along the first direction X, along the first direction X, the first expansion beam 121 is arranged between the second expansion beam 122 and the fourth box side wall 1153, and the two ends of the first expansion beam 121 along the second direction Y are respectively connected to the first box side wall 1151 and the second box side wall 1152, and the first expansion beam 121 divides the box body 110 into a first accommodating cavity 101 and a second accommodating cavity 102. The second expansion beam 122, the first expansion beam 121, the first box side wall 1151 and the second box side wall 1152 are arranged around the first accommodating cavity 101, and the second expansion beam 122, the first expansion beam 121, the first box side wall 1151 and the second box side wall 1152 corresponding to the first accommodating cavity 101 form a cavity side wall portion 103. The battery cell assembly 20 is arranged in the first accommodating cavity 101, and the second expansion beam 122 and the first expansion beam 121 are respectively arranged at both ends of the battery cell assembly 20 along the first direction X.

[0182] Along the second direction Y, the second expansion beam 122 and the first expansion beam 121 are respectively provided with a first cavity 123 that passes through both ends, and the first cavity 123 is provided as a flow channel 105 for the heat exchange medium to flow, and the details can refer to the second sub-flow channel 1052 and the first sub-flow channel 1051. The first box side wall 1151 and the second box side wall 1152 respectively include a first portion 1156 and a second portion 1157 that are connected as one body, the first portion 1156 is arranged around the first accommodating cavity 101, and the second portion 1157 is arranged on the side of the corresponding first portion 1156 away from the first accommodating cavity 101, and the second portion 1157 is provided with a mounting hole 1158, and the mounting hole 1158 is used to cooperate with the fastening assembly to fix the battery device 100. Along the first direction X, the first part 1156 and the second part 1157 are both provided with a second cavity 1154 that passes through both ends. The second cavity 1154 on the first part 1156 serves as a flow channel 105 for the flow of heat exchange medium. For details, please refer to the third sub-flow channel 1053 and the fourth sub-flow channel 1054. Among them, the two ends of the second expansion beam 122 and the two ends of the first expansion beam 121 are respectively connected to the sides of the first box side wall 1151 and the second box side wall 1152 that are close to each other, the second expansion beam 122 and the first expansion beam 121 are both sealed and connected to the first box side wall 1151 and the second box side wall 1152, the first box side wall 1151 seals the end of the first cavity 123 corresponding to the first box side wall 1151, the first box side wall 1151 is respectively provided with a first connecting port 1055 corresponding to each first cavity 123 of the second expansion beam 122, the second box side wall 1152 seals the end of the first cavity 123 corresponding to the second box side wall 1152, and the second box side wall 1152 is respectively provided with a second connecting port 1056 corresponding to each first cavity 123 of the second expansion beam 122, and the second box side wall 1152 is respectively provided with a third connecting port 1057 corresponding to each first cavity 123 of the first expansion beam 121. One end of the first box side wall 1151 and the second box side wall 1152 facing the fourth box side wall 1153 is respectively connected to the side of the fourth box side wall 1153 facing the second expansion beam 122, and the fourth box side wall 1153 seals the corresponding end of the second cavity 1154 of each first part 1156, and a sealing plate 141 is provided at the end of the first box side wall 1151 and the second box side wall 1152 facing away from the fourth box side wall 1153, and the sealing plate 141 seals the end of the second cavity 1154 of each first part 1156 facing away from the fourth box side wall 1153.The fourth box side wall 1153 is provided with a third cavity 1155, and the third cavity 1155 is penetrated along the second direction Y. Along the second direction Y, the end surface of the fourth box side wall 1153 close to the first box side wall 1151 is provided with a cover 142, and the cover 142 is provided with an inlet 106, and the inlet 106 is provided with an inlet joint. The end of the third cavity 1155 close to the first box side wall 1151 is provided with a blocking member 143, and the blocking member 143 is spaced apart from the cover 142 to form a cavity 1059. The portion between the blocking member 143 and the cover 142 is provided with a fourth communication port 1058, which communicates the cavity 1059 with the second cavity 1154 of the first portion 1156 of the first box side wall 1151 (i.e., the flow channel 105 of the first box side wall 1151), and the first expansion beam 121 is provided with a flow outlet 107 at one end close to the first box side wall 1151, which communicates with the first cavity 123 of the flow channel 105 formed by the first expansion beam 121, and an outlet joint 109 is provided on the flow outlet 107. The inlet joint 108 is used to communicate with the medium outlet of the thermal management device, and the outlet joint 109 is used to communicate with the medium inlet of the thermal management device. The heat exchange medium flows from the medium outlet of the thermal management device through the inlet joint 108 into the cavity 1059 between the blocking member 143 and the cover 142, and then flows through the fourth connecting port 1058 to the flow channel 105 (third sub-flow channel 1053) of the first box side wall 1151, and then flows through the flow channel 105 (third sub-flow channel 1053) of the first box side wall 1151 in sequence. After passing through the third sub-channel 1053), the first connecting port 1055, the channel 105 of the second expansion beam 122 (the second sub-channel 1052), the second connecting port 1056, the channel 105 of the second box side wall 1152 (the fourth sub-channel 1054), the third connecting port 1057, and the channel 105 of the first expansion beam 121 (the first sub-channel 1051), it flows out through the outlet joint 109 on the first expansion beam 121 and flows back to the medium inlet of the thermal management device.

[0183] Along the height direction Z of the battery device 100 , the flow dimension of the flow channel 105 (second sub-flow channel 1052 ) of the second expansion beam 122 is 50% to 90% of the height dimension of the second expansion beam 122 , and the height dimension of the second expansion beam 122 is the dimension between the top end surface and the bottom end surface of the second expansion beam 122 .

[0184] Along the height direction Z of the battery device 100 , the flow dimension of the flow channel 105 (first sub-flow channel 1051 ) of the first expansion beam 121 is 50% to 90% of the height dimension of the first expansion beam 121 , and the height dimension of the first expansion beam 121 is the dimension between the top end surface and the bottom end surface of the second expansion beam 122 .

[0185] Along the height direction Z of the battery device 100 , the flow dimension of the flow channel 105 (the third sub-flow channel 1053 ) of the first box side wall 1151 is 50% to 90% of the height dimension of the first box side wall 1151 , and the height dimension of the first box side wall 1151 is the dimension between the top end surface to the bottom end surface of the second expansion beam 122 .

[0186] Along the height direction Z of the battery device 100 , the flow dimension of the flow channel 105 (the fourth sub-flow channel 1054 ) of the second box side wall 1152 is 50% to 90% of the height dimension of the second box side wall 1152 , and the height dimension of the second box side wall 1152 is the dimension between the top end surface and the bottom end surface of the second expansion beam 122 .

[0187] The first direction X, the second direction Y, and the height direction Z of the battery device 100 are substantially perpendicular to each other. Specifically, the first direction X is the length direction of the battery device 100 , and the second direction Y is the width direction of the battery device 100 .

[0188] like Fig.13 As shown, the battery device 100 may further include a bottom heat exchange assembly 130, wherein the bottom wall 114 of the box is at least partially configured as the bottom wall portion 104 of the first accommodating chamber 101, and the bottom heat exchange assembly 130 is disposed on the bottom wall portion 104. The bottom heat exchange assembly 130 is provided with a heat exchange channel, and the channel inlet and the channel outlet of the heat exchange channel may be connected to the thermal management device, and the heat exchange medium flows through the heat exchange channel to perform thermal management on the battery cell 21 from the bottom of the battery cell assembly 20. Among them, the heat exchange channel and the flow channel 105 are connected to the thermal management device in parallel.

[0189] The battery device 100 of this embodiment can utilize the flow channel 105 of the cavity side wall portion 103 together with the bottom heat exchange component 130 to control the temperature of the battery cell assembly 20. Compared with the method of relying solely on the bottom heat exchange component 130, when the flow channel 105 is only provided in the expansion beam 120, the heat exchange efficiency can be improved by about 10%. When the expansion beam 120, the first box side wall 1151 and the second box side wall 1152 are all provided with the flow channel 105, the heat exchange efficiency can be improved by about 20%.

[0190] An embodiment of the present application provides a battery system, including a thermal management device, the battery system also includes a battery device 100 proposed in the present application or any embodiment of the present application, the thermal management device is configured to provide a heat exchange medium to the battery device 100 and control the temperature of the heat exchange medium, wherein the inlet 106 is provided with an inlet joint 108, the inlet joint 108 is configured to be connected to the medium outlet of the thermal management device, and the outlet 107 is provided with an outlet joint 109, and the outlet joint 109 is configured to be connected to the medium inlet of the thermal management device.

[0191] The thermal management device may be disposed outside the battery device 100. The thermal management device may heat or cool the heat exchange medium. Exemplarily, the thermal management device may include a first heat exchange circuit and a second heat exchange circuit. The second heat exchange circuit may be a heat exchange medium circulation system, which is used to communicate with the flow channel 105 in the cavity side wall portion 103 to perform heat exchange with the battery device 100. The first heat exchange circuit is used to perform heat exchange with the second heat exchange circuit. The first heat exchange circuit may be in the form of a refrigeration system combined with a heater. The refrigeration system may include a compressor, a first heat exchanger, an expansion valve, a second heat exchanger and other components arranged in series through a refrigerant pipeline. The refrigeration system cools the heat exchange medium of the second heat exchange circuit through the first heat exchanger to cool the battery device 100. The heater may heat the heat exchange medium (i.e., water) in the second heat exchange circuit to heat the battery device 100.

[0192] Exemplarily, the thermal management device is configured as a thermal management system of an electrical device. For example, the heat exchange device may be configured as an air conditioning system of the vehicle 1000 .

[0193] The battery system of this embodiment has the beneficial effects of the battery device 100 proposed in this application or any embodiment of this application.

[0194] The present application also provides an electrical device, which includes the battery device 100 proposed in the present application or any embodiment of the present application, or the electrical device includes the battery system proposed in the present application or any embodiment of the present application.

[0195] The power-consuming device may be any of the above-mentioned devices or systems using the battery device 100 .

[0196] For example, the thermal management system of the electric device can also be used as the thermal management device of the battery device 100 to provide a heat exchange medium with the battery device 100. For example, the electric device can also be provided with an independent thermal management device for the battery device 100.

[0197] The electric device of this embodiment has the same beneficial effects as the battery device 100 proposed in this application or any embodiment of this application.

[0198] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box assembly, wherein the box assembly is provided with a first accommodating cavity, and the box assembly has a cavity side wall portion, and the cavity side wall portion is provided to surround the first accommodating cavity; A battery cell assembly is disposed in the first accommodating cavity, and the cavity side wall portion is disposed around the outside of the battery cell assembly; The box assembly includes an expansion beam, and the expansion beam is arranged at at least one end of the battery cell assembly, and the expansion beam is arranged as a part of the cavity side wall portion, and the expansion beam is used to resist the expansion force of the battery cell assembly. Along the circumference of the cavity side wall portion, the cavity side wall portion is provided with a flow channel for the flow of heat exchange medium at least in the beam body of the expansion beam, and the cavity side wall portion is provided with an inlet and an outlet, and the inlet and the outlet are both connected to the flow channel, the inlet is used to allow the heat exchange medium to flow into the flow channel, and the outlet is used to allow the heat exchange medium that has flowed through the flow channel to flow out of the flow channel.

2. The battery device according to claim 1, characterized in that: Along the height direction of the battery device, the flow dimension of the flow channel is 50% to 90% of the height dimension of the cavity side wall portion in the area corresponding to the flow channel, and the height dimension of the cavity side wall portion is the dimension between the top end surface and the bottom end surface of the cavity side wall portion.

3. The battery device according to claim 1, characterized in that: The box assembly also includes a box, and the expansion beam includes a first expansion beam. The first expansion beam is arranged in the box and divides the box into the first accommodating cavity and the second accommodating cavity. The second accommodating cavity accommodates the electronic control component of the battery device, and the flow channel is arranged in the first expansion beam.

4. The battery device according to claim 1, characterized in that: The box assembly includes a box, and the box includes a first box side wall and a second box side wall arranged opposite to each other, at least a portion of the first box side wall and at least a portion of the second box side wall are respectively arranged as parts of the cavity side wall portion, and both ends of the expansion beam are respectively connected to the first box side wall and the second box side wall, and the flow channel is arranged in the wall body of the first box side wall and / or the wall body of the second box side wall.

5. The battery device according to claim 4, characterized in that: The flow channel of the expansion beam is connected to the flow channel of the first box side wall and / or the flow channel of the second box side wall.

6. The battery device according to claim 5, characterized in that: The flow channel is disposed in the wall body of the first box side wall and the wall body of the second box side wall. The flow channel of the first box side wall, the flow channel of the expansion beam and the flow channel of the second box side wall are connected in series.

7. The battery device according to claim 6, characterized in that: The expansion beam includes a first expansion beam and a second expansion beam. Along a first direction, the first expansion beam and the second expansion beam are arranged relative to each other and spaced apart. The battery cell assembly is arranged between the first expansion beam and the second expansion beam. The flow channels are respectively arranged in the beam body of the first expansion beam and the beam body of the second expansion beam. The flow channels of the first box side wall, the flow channels of the first expansion beam, the flow channels of the second box side wall and the flow channels of the second expansion beam are connected in series. The first direction intersects with the second direction. The second direction is the arrangement direction from the first box side wall to the second box side wall.

8. The battery device according to claim 7, characterized in that: The second expansion beam is connected to the end of the first box side wall and the end of the second box side wall, and the second expansion beam is connected to the same end of the first box side wall and the second box side wall, and the second expansion beam is set as a partial box side wall of the box body.

9. The battery device according to claim 7, characterized in that: The inlet is communicated with the inlet of the flow channel of the first box side wall, and the outlet is provided on the first expansion beam, and the outlet is communicated with the outlet of the flow channel of the first expansion beam.

10. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further comprises an inlet joint and an outlet joint, wherein the inlet joint is connected to the periphery of the inlet and communicates with the inlet, and the outlet joint is connected to the periphery of the outlet and communicates with the outlet.

11. The battery device according to claim 3, characterized in that: The battery device also includes an inlet joint and an outlet joint, the inlet is arranged on the first expansion beam or the box side wall of the box body surrounding the second accommodating cavity, the inlet joint is connected to the periphery of the inlet and communicates with the inlet, the outlet is arranged on the first expansion beam or the box side wall of the box body surrounding the second accommodating cavity, the outlet joint is connected to the periphery of the outlet and communicates with the outlet.

12. The battery device according to claim 4, characterized in that: The first box side wall and / or the second box side wall include a first part and a second part connected to each other, the first part is arranged around the first accommodating cavity, the second part is arranged on the side of the corresponding first part away from the first accommodating cavity, and the first part is provided with the flow channel.

13. The battery device according to any one of claims 1 to 9, 11 and 12, characterized in that: The expansion beam has a plurality of first cavities, wherein the first cavities extend from one end of the expansion beam to the other end, and at least one of the plurality of first cavities is configured as the flow channel.

14. The battery device according to claim 4, characterized in that: The first box side wall and / or the second box side wall has a plurality of second cavities, the second cavities extend along a first direction, at least one of the plurality of second cavities is configured as the flow channel, the first direction intersects with the second direction, and the second direction is an arrangement direction from the first box side wall to the second box side wall.

15. The battery device according to any one of claims 1 to 9, 11 and 12, characterized in that: The battery device further includes a bottom heat exchange assembly, the box body includes a box bottom wall, the box bottom wall is at least partially configured as a cavity bottom wall portion of the first accommodating cavity, and the bottom heat exchange assembly is arranged on the cavity bottom wall portion.

16. A battery system, characterized in that: It comprises a thermal management device and a battery device according to any one of claims 1 to 15, wherein the thermal management device is configured to provide a heat exchange medium to the battery device and to control the temperature of the heat exchange medium, wherein the inlet is provided with an inlet joint, the outlet is provided with an outlet joint, the inlet joint is configured to be connected to the medium outlet of the thermal management device, and the outlet joint is configured to be connected to the medium inlet of the thermal management device.

17. An electrical equipment, characterized in that: The invention comprises the battery device according to any one of claims 1 to 15 or the battery system according to claim 16, wherein the battery device is used to store or provide electrical energy.

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