Battery device based on chassis integration and electric vehicle

Abstract

The embodiment of the application provides a battery device based on chassis integration and an electric vehicle, and relates to the technical field of battery thermal management. The battery device based on chassis integration comprises a chassis and a battery cell assembly; the chassis comprises a system circuit mechanism and a plurality of battery cell slots, the battery cell assembly comprises a plurality of battery cells, and the plurality of battery cells are installed in the plurality of battery cell slots one by one; the battery cell is provided with a plurality of pole columns, each of the pole columns is provided with a first magnetic member, the system circuit mechanism is provided with a plurality of second magnetic members, the second magnetic members are connected or disconnected with the corresponding first magnetic members according to the magnetism of the second magnetic members, the system circuit mechanism is electrically connected with the second magnetic members, and the system circuit mechanism is used for adjusting the magnetism of the second magnetic members. The battery device based on chassis integration can achieve the technical effect of preventing battery thermal runaway.

Description

Technical Field

[0001] This application relates to the field of battery thermal management technology, and more specifically, to a battery device and electric vehicle based on chassis integration. Background Technology

[0002] Currently, electric vehicle battery packs consist of multiple batteries stacked in series; a typical battery pack has approximately 96 batteries. For lithium-ion batteries charged to 4.2V, such a pack can generate a total voltage exceeding 400V. Although the vehicle's power system treats the battery pack as a single high-voltage battery, charging and discharging the entire pack each time, the battery control system must consider the condition of each battery independently. If one battery in the pack has a slightly lower capacity than the others, its state of charge will gradually deviate from the others after several charge / discharge cycles. If this battery's state of charge is not periodically balanced with the others, it will eventually enter a deep discharge state, leading to damage and ultimately battery pack failure. To prevent this, the voltage of each battery must be monitored to determine its state of charge.

[0003] In existing technologies, when a battery pack malfunctions, it can cause thermal runaway, damaging the entire battery pack and potentially leading to a fire or explosion of the entire battery system. While some technologies exist to prevent heat propagation, these are primarily passive methods. However, relying on heat-insulating and high-temperature-resistant materials to prevent heat propagation, coupled with heat removal through heat exchange, results in low thermal management efficiency for the battery, making it prone to thermal runaway and even fire or explosion. Summary of the Invention

[0004] The purpose of this application is to provide a battery device and electric vehicle based on an integrated chassis, which can achieve the technical effect of preventing battery thermal runaway.

[0005] In a first aspect, embodiments of this application provide a battery device based on an integrated chassis, including a chassis and a cell assembly;

[0006] The chassis includes a system circuit mechanism and multiple battery cell slots. The battery cell assembly includes multiple battery cells, which are installed one-to-one in the multiple battery cell slots.

[0007] The battery cell is provided with multiple pole posts, each pole post being provided with a first magnetic component. The system circuit mechanism is provided with multiple second magnetic components. The second magnetic component is connected or disconnected from the corresponding first magnetic component according to the magnetism of the second magnetic component. The system circuit mechanism is electrically connected to the second magnetic component and is used to adjust the magnetism of the second magnetic component.

[0008] In the aforementioned implementation process, the chassis-integrated battery device achieves electrical connection between the battery cell and the system circuit mechanism by having a first magnetic component within the terminal post and a second magnetic component within the system circuit mechanism attract each other at different times due to their magnetic properties. When a battery cell in the battery cell assembly experiences thermal runaway, the system circuit mechanism adjusts the magnetism of the second magnetic component through a control circuit, making the first and second magnetic components have the same magnetism and repel each other. This causes the thermally runaway cell to be ejected from the battery system, preventing thermal runaway of the entire battery cell assembly and thus ensuring the safety of the battery system and the vehicle. Therefore, the chassis-integrated battery device effectively prevents battery thermal runaway.

[0009] Furthermore, the electrode post is a convex electrode post, which is disposed at the bottom of the battery cell and protrudes from the bottom plane of the battery cell.

[0010] In the above implementation process, the electrode is set as a convex electrode. The battery cell can be electrically connected to the system circuit mechanism through the convex electrode, avoiding large-area contact between the battery cell and the system circuit mechanism, and reducing the speed at which thermal runaway battery cell heat spreads to the system circuit mechanism.

[0011] Furthermore, the device also includes multiple cell explosion-proof valves, which are disposed between the system circuit mechanism and the cell.

[0012] In the above implementation process, the cell explosion-proof valve serves as a pressure relief device for the cell in thermal runaway, preventing the cell from exploding.

[0013] Furthermore, the device also includes a plurality of elastic mechanisms disposed between the system circuit mechanism and the battery cell.

[0014] In the above implementation process, when the magnetism of the first magnetic component and the second magnetic component are opposite, the first magnetic component and the second magnetic component are connected, and the elastic mechanism is in a compressed state; when the magnetism of the first magnetic component and the second magnetic component are the same, the first magnetic component and the second magnetic component repel each other and are disconnected, and the battery cell is ejected under the action of the elastic mechanism.

[0015] Furthermore, the system circuit mechanism is provided with multiple raised platforms, and the elastic mechanism is mounted on the corresponding raised platforms.

[0016] In the above implementation process, by setting up a raised platform, the distance between the bottom plane of the battery cell and the top plane of the system circuit mechanism is increased, thereby further reducing the speed at which thermal runaway battery cell heat spreads to the system circuit mechanism.

[0017] Furthermore, the device also includes a plurality of pressure sensors installed within the system circuitry, the pressure sensors being used to detect the gas pressure of the corresponding battery cell.

[0018] In the above implementation process, the gas pressure inside the cell is monitored by a pressure sensor. When the internal pressure of the cell reaches a certain level and the pressure increase rate is abnormal, the battery system identifies the data from the pressure sensor to determine whether the cell has a risk of thermal runaway. If there is a risk, the magnetism of the second magnetic component can be controlled to eject the cell.

[0019] Furthermore, the device also includes multiple temperature sensors installed within the system circuitry, the temperature sensors being used to detect the gas temperature of the corresponding battery cell.

[0020] In the above implementation process, the temperature inside the battery cell is monitored by a temperature sensor. When the temperature of the battery cell is abnormal, the magnetism of the second magnetic component can be controlled to eject the battery cell and prevent thermal runaway.

[0021] Furthermore, the device also includes a protective plate, which is installed above the battery cell and the battery cell slot.

[0022] In the above process, the protective plate seals the battery cell inside the cell slot, thus providing protection.

[0023] Furthermore, the protective plate is bonded to the battery cell and the battery cell slot using structural adhesive.

[0024] Secondly, embodiments of this application provide an electric vehicle including a battery device based on chassis integration as described in any of the first aspects.

[0025] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of a chassis-integrated battery device provided in an embodiment of this application;

[0029] Figure 2 A cross-sectional structural diagram of a battery device based on an integrated chassis provided in an embodiment of this application;

[0030] Figure 3 A schematic cross-sectional view of the first part of the chassis-integrated battery device provided in an embodiment of this application;

[0031] Figure 4 A schematic cross-sectional view of the second part of the chassis-integrated battery device provided in an embodiment of this application;

[0032] Figure 5 A schematic cross-sectional view of the third part of the chassis-integrated battery device provided in the embodiments of this application;

[0033] Figure 6 This is a schematic cross-sectional view of the fourth part of the battery device based on chassis integration provided in the embodiments of this application.

[0034] Icons: Chassis 100; System circuit mechanism 110; Second magnetic component 111; Cell slot 120; Cell assembly 200; Cell 210; Terminal post 211; First magnetic component 212; Cell explosion-proof valve 310; Elastic mechanism 320; Pressure sensor 330; Protective plate 400. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0037] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0038] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0039] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0040] This application provides a chassis-integrated battery device and electric vehicle that can be applied to CTC (Clean-Temperature Control) technology for power batteries. The chassis-integrated battery device achieves electrical connection between the battery cell and the system circuit mechanism by having a first magnetic component within the terminal post and a second magnetic component within the system circuit mechanism attract each other at different times due to their different magnetic properties. When a cell in the battery assembly experiences thermal runaway, the system circuit mechanism adjusts the magnetism of the second magnetic component through a control circuit, making the first and second magnetic components have the same magnetism and repel each other. This causes the thermally runaway cell to be ejected from the battery system, preventing thermal runaway of the entire battery assembly and ensuring the safety of the battery system and the vehicle. Therefore, this chassis-integrated battery device effectively prevents battery thermal runaway.

[0041] For example, the integration of the battery with the vehicle chassis is also known as Cell to Chassis (CTC) technology. The essence of CIC technology is to eliminate most of the modules inside the battery pack and directly install the cells or modules on the vehicle chassis. The cells not only supply power to the vehicle, but also serve as structural components of the chassis.

[0042] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of a chassis-integrated battery device provided in an embodiment of this application. Figure 2 This is a cross-sectional structural diagram of a battery device based on an integrated chassis, provided in an embodiment of this application. Figure 3 This is a schematic cross-sectional view of the first part of the chassis-integrated battery device provided in an embodiment of this application. Figure 1 Section AA and Figure 2 correspond, Figure 2 Part B in Figure 3 Correspondingly, the chassis-integrated battery device includes a chassis 100 and a cell assembly 200.

[0043] For example, the chassis 100 includes a system circuit mechanism 110 and a plurality of cell slots 120, and the cell assembly 200 includes a plurality of cells 210, which are installed one-to-one in the plurality of cell slots 120.

[0044] For example, the battery cell 210 is provided with a plurality of pole posts 211, each pole post 211 is provided with a first magnetic component 212, and the system circuit mechanism 110 is provided with a plurality of second magnetic components 111. The second magnetic component 111 is connected or disconnected from the corresponding first magnetic component 212 according to the magnetism of the second magnetic component 111. The system circuit mechanism 110 is electrically connected to the second magnetic component 111 and is used to adjust the magnetism of the second magnetic component 111.

[0045] For example, the first magnetic component 212 includes a magnetic material, and the second magnetic component 111 also includes a magnetic material. The magnetism of the second magnetic component 111 can be controlled by the system circuit mechanism 110. When the magnetism of the first magnetic component 212 and the second magnetic component 111 is opposite, the first magnetic component 212 and the second magnetic component 111 are connected, thereby realizing the electrical connection between the system circuit mechanism 110 and the battery cell 210. When the magnetism of the first magnetic component 212 and the second magnetic component 111 is the same, the first magnetic component 212 and the second magnetic component 111 repel each other and are disconnected, thereby realizing the disconnection between the system circuit mechanism 110 and the battery cell 210, and ejecting the battery cell 210 from the battery cell slot 120.

[0046] In some implementations, the system circuitry 110 includes the vehicle's system circuitry, such as various control circuits, power transmission lines, etc.

[0047] In some embodiments, the chassis-integrated battery device achieves electrical connection between the cell 210 and the system circuit mechanism 110 by having a first magnetic component 212 within the terminal post 211 and a second magnetic component 111 within the system circuit mechanism 110 attract each other at different times due to their magnetic properties. This allows the surface of the terminal post 211 to adhere to the system circuit mechanism 110. When a cell 210 in the cell assembly 200 experiences thermal runaway, the system circuit mechanism 110 adjusts the magnetism of the second magnetic component 111 through a control circuit, making the first magnetic component 212 and the second magnetic component 111 have the same magnetism and repel each other. This causes the thermally runaway cell 210 to be ejected from the battery system, preventing thermal runaway of the entire cell assembly 200 and ensuring the safety of the battery system and the vehicle. Therefore, the chassis-integrated battery device effectively prevents battery thermal runaway.

[0048] For example, the electrode post 211 is a convex electrode post, which is disposed at the bottom of the cell 210 and protrudes from the bottom plane of the cell 210.

[0049] For example, the electrode post 211 is set as a convex electrode post, and the battery cell 210 can be electrically connected to the system circuit mechanism 110 through the convex electrode post, avoiding large-area contact between the battery cell 210 and the system circuit mechanism 110, and reducing the speed at which the thermal runaway battery cell 210 spreads heat to the system circuit mechanism 110.

[0050] Please see Figure 4 , Figure 4 This is a schematic cross-sectional view of the second part of the chassis-integrated battery device provided in an embodiment of this application. Figure 2 Part C in Figure 4 correspond.

[0051] For example, the chassis-integrated battery device also includes a plurality of cell explosion-proof valves 310, which are disposed between the system circuit mechanism 110 and the cell 210.

[0052] For example, the cell explosion-proof valve 310 serves as a pressure relief device for the cell 210 in thermal runaway, preventing the cell 210 in thermal runaway from exploding.

[0053] Please see Figure 5 , Figure 5 This is a schematic cross-sectional view of the third part of the chassis-integrated battery device provided in an embodiment of this application. Figure 2 Part D in Figure 5 correspond.

[0054] For example, the chassis-integrated battery device also includes a plurality of elastic mechanisms 320 disposed between the system circuit mechanism 110 and the battery cell 220.

[0055] For example, when the magnetism of the first magnetic component 212 and the second magnetic component 111 is opposite, the first magnetic component 212 and the second magnetic component 111 are connected, and the elastic mechanism 320 is in a compressed state; when the magnetism of the first magnetic component 212 and the second magnetic component 111 is the same, the first magnetic component 212 and the second magnetic component 111 repel each other and are disconnected, and the battery cell 210 is ejected under the action of the elastic mechanism 320.

[0056] In some implementations, such as Figure 5 As shown, when the first magnetic component 212 and the second magnetic component 111 are connected, that is, when the elastic mechanism 320 is in a compressed state, the elastic mechanism 320 is embedded in the bottom plane of the battery cell 110, and the embedding distance is X.

[0057] For example, the elastic mechanism 320 may be an elastic leaf spring, spring, etc., which is only an example and not a limitation.

[0058] For example, the system circuit mechanism 110 is provided with multiple raised platforms, and the elastic mechanism 320 is mounted on the corresponding raised platform.

[0059] For example, by setting a raised platform, the distance between the bottom plane of the battery cell 210 and the top plane of the system circuit mechanism 110 is increased, thereby further reducing the speed at which thermal runaway battery cell 210 spreads heat to system circuit mechanism 110.

[0060] For example, the chassis-integrated battery device also includes a plurality of pressure sensors 330, which are installed in the system circuit structure 110 and are used to detect the gas pressure of the corresponding battery cell 210.

[0061] For example, the pressure sensor 330 monitors the gas pressure inside the cell 210. When the internal pressure of the cell 210 reaches a certain level and the pressure increase rate is abnormal, the battery system identifies the data from the pressure sensor 330 to determine whether the cell 210 has a risk of thermal runaway. If there is a risk, the magnetism of the second magnetic component 111 can be controlled to eject the cell 210.

[0062] For example, the chassis-integrated battery device also includes multiple temperature sensors installed within the system circuitry 110, which are used to detect the gas temperature of the corresponding battery cell 210.

[0063] For example, the temperature inside the battery cell 210 is monitored by a temperature sensor. When the temperature of the battery cell 210 is abnormal, the magnetism of the second magnetic component 111 can be controlled to eject the battery cell 210 and prevent thermal runaway of the battery cell 210.

[0064] Please see Figure 6 , Figure 6 This is a schematic cross-sectional view of the fourth part of the chassis-integrated battery device provided in an embodiment of this application. Figure 2 The E part in Figure 6 correspond.

[0065] For example, the chassis-integrated battery device also includes a protective plate 400, which is mounted above the battery cell 210 and the battery cell slot 120.

[0066] For example, the protective plate 400 seals the battery cell 210 inside the battery cell slot 120, thus providing protection.

[0067] For example, the protective plate 400 is bonded to the battery cell 210 and the battery cell slot 120 by structural adhesive.

[0068] In some embodiments, this application provides an electric vehicle, including as follows: Figures 1 to 6 The battery device is based on an integrated chassis.

[0069] For example, the battery device based on chassis integration provided in this application embodiment is a CTC technology method. The battery cell 210 is placed in the battery cell slot 120. The magnetic material of the terminal post 211 and the magnetic material of the system circuit mechanism 110 are attracted to each other to achieve electrical connection. The elastic mechanism 320 is in a compressed state. The protective plate 400 is bonded to the battery cell 210 and the vehicle body by structural adhesive.

[0070] For example, by utilizing the principle of attraction between the magnetic materials of the pole piece 211 and the magnetic materials of the system circuit mechanism 110 due to their different magnetic properties, the surface of the pole piece 211 and the surface of the system circuit mechanism 110 are made to adhere together to achieve electrical connection, thus eliminating the need for laser welding connection between the pole piece 211 of the battery cell 210 and the system circuit mechanism 110.

[0071] For example, when a cell 210 of the battery cell assembly 200 experiences thermal runaway, the system circuit mechanism 110 adjusts the magnetism of the magnetic material of the system electrical connection through the control circuit, so that the magnetic material of the terminal 211 and the magnetic material of the system circuit mechanism 110 are similar in magnetism but repel each other. In addition, the elastic mechanism 320 generates a rebound force, causing the thermally runaway cell 210 to be ejected from the battery system, thereby ensuring the safety of the battery system and the vehicle.

[0072] For example, the gas pressure monitoring inside the cell 210 is achieved through a pressure sensor 330. During long-term use or cycling, the positive and negative electrodes may react with the electrolyte, causing the gas pressure inside the cell 210 to continuously increase. When the cell 210 experiences internal thermal runaway, a large amount of gas will be generated, which may cause the pressure to be released in a short time, resulting in an explosion of the cell 210. By monitoring the internal gas pressure of the cell 2120 through the pressure sensor 330, when the internal pressure of the cell 210 reaches a certain level and the pressure increase rate is abnormal, the battery system will determine whether the cell 210 has a risk of thermal runaway. If so, the cell 210 will be ejected; otherwise, commands such as power reduction will be requested.

[0073] For example, in the chassis-integrated battery device provided in this application embodiment, two magnetic materials attract each other due to their different magnetic properties, thus achieving electrical connection; two magnetic materials repel each other due to their similar magnetic properties, thus achieving separation of the thermal runaway cell 210 from the vehicle body, thereby actively preventing heat propagation; the compression and rebound force of the elastic mechanism 320 separates the thermal runaway cell 210 from the vehicle body; and the pressure sensor 330 monitors the internal pressure of the cell 210 in real time, thereby determining the health status of the cell 210 and whether thermal runaway has occurred, providing a basis for the battery management system.

[0074] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0075] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0076] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A battery device based on an integrated chassis, characterized in that, Including chassis and battery cell components; The chassis includes a system circuit mechanism and multiple battery cell slots. The battery cell assembly includes multiple battery cells, which are installed one-to-one in the multiple battery cell slots. The battery cell is provided with multiple pole posts, each pole post is provided with a first magnetic component, and the system circuit mechanism is provided with multiple second magnetic components. The second magnetic component is connected or disconnected from the corresponding first magnetic component according to the magnetism of the second magnetic component. The system circuit mechanism is electrically connected to the second magnetic component and is used to adjust the magnetism of the second magnetic component. The electrode post is a convex electrode post, which is disposed at the bottom of the battery cell and protrudes from the bottom plane of the battery cell; The device further includes multiple elastic mechanisms disposed between the system circuit mechanism and the battery cell; the system circuit mechanism is provided with multiple raised platforms, and the elastic mechanisms are mounted on the corresponding raised platforms.

2. The battery device based on chassis integration according to claim 1, characterized in that, The device also includes multiple cell explosion-proof valves, which are disposed between the system circuit mechanism and the cell.

3. The battery device based on chassis integration according to claim 1, characterized in that, The device also includes multiple pressure sensors installed within the system circuitry, which are used to detect the gas pressure of the corresponding battery cell.

4. The battery device based on chassis integration according to claim 1, characterized in that, The device also includes multiple temperature sensors installed within the system circuitry, which are used to detect the gas temperature of the corresponding battery cell.

5. The battery device based on chassis integration according to claim 1, characterized in that, The device also includes a protective plate, which is installed above the battery cell and the battery cell slot.

6. The battery device based on chassis integration according to claim 5, characterized in that, The protective plate is bonded to the battery cell and the battery cell slot by structural adhesive.

7. An electric vehicle, characterized in that, Includes the chassis-integrated battery device as described in any one of claims 1 to 6.

Images