A thermoelectric isolation device and battery pack

Abstract

The utility model provides a kind of thermoelectric isolation device and battery pack, and thermoelectric isolation device includes heat insulation board, protective cover, heat insulation layer and sealing element, heat insulation board is at least partially covered on the top cover of battery cell, and the explosion valve of each battery cell is sealed and isolated, and the heat insulation board is used to realize the heat isolation to the top cover of battery cell and guide explosion valve directional opening valve;Form the accommodating cavity between protective cover and the top cover of battery cell, electrical component is arranged in accommodating cavity, protective cover and heat insulation board form thermal runaway dispersion area on the side away from battery cell, high-heat material can be dispersed into thermal runaway dispersion area after explosion valve opens, isolation is realized by protective cover and electrical component, greatly reduce thermal runaway risk;Heat insulation layer can realize isolation and protection to adjacent explosion valve;Sealing element is installed between the top cover of battery cell and heat insulation board, improve sealing property, further guarantee heat insulation effect.The device structure is simple, reliable protection, effectively solve the problem of high-voltage short-circuit arc under thermal runaway, and prolong the effective working time of CCS acquisition board.

Description

Technical Field

[0001] This utility model relates to the field of thermal safety management of power batteries, specifically to a thermoelectric isolation device and a battery pack. Background Technology

[0002] With increasing environmental awareness, electric vehicles are gradually replacing gasoline vehicles, becoming a development trend in the automotive industry. As the core power source for electric vehicles, the importance of the power battery module is particularly prominent. A power battery module or pack consists of multiple battery cells encapsulated in a casing. Each battery cell is equipped with an explosion-proof valve. When a battery cell experiences overcharging, short circuits, or other abnormal operations, or prolonged use leading to cell expansion and severe overheating, the explosion-proof valve opens to allow high-temperature, high-pressure gases and particulate matter inside the cell to escape from the cell casing. However, the internal space of the battery module is limited. In new energy vehicle packs, protection against high-temperature, high-pressure gases and particulate matter ejected after thermal runaway from the cells is currently inadequate. Conventional structures and materials suffer varying degrees of structural damage during thermal runaway. There is a risk of short circuits between adjacent aluminum bars within a single module, between aluminum bars in adjacent modules, and between the module aluminum bar and the pack housing. Furthermore, foreign objects falling onto the surface of the explosion-proof valve can affect its opening action, posing an electrical safety hazard. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a thermoelectric isolation device and battery pack that can ensure structural integrity at high temperatures, achieve protection between the aluminum busbar, CCS (Cells Contact System, integrated busbar) and adjacent top covers of the battery cells, effectively isolate conductive substances ejected after thermal runaway of the battery cells, achieve reliable protection for electrical components and battery cells, and greatly reduce the risk of thermal runaway caused by short circuits.

[0004] To achieve the above and other related objectives, this utility model provides a thermoelectric isolation device, comprising:

[0005] A heat insulation plate at least partially covers the top cover of the battery cell. The heat insulation plate has a first air hole, which is arranged corresponding to the explosion-proof valve on the top cover of the battery cell. The heat insulation plate seals and isolates the explosion-proof valve of each battery cell.

[0006] The insulation layer at least covers the first pore;

[0007] A protective cover is provided, and a receiving cavity is formed between the protective cover and the top cover of the battery cell, and electrical components are disposed within the receiving cavity;

[0008] The protective cover and the heat insulation plate form a thermal runaway evacuation area on the side away from the battery cell, and the thermal runaway evacuation area is sealed and isolated from the receiving cavity.

[0009] In an optional embodiment of this utility model, a sealing element is provided on the side of the heat insulation plate near the top cover of the battery cell. The sealing element forms a second vent around the explosion-proof valve, which seals and isolates the explosion-proof valves of each battery cell from the heat insulation plate.

[0010] In an optional embodiment of this utility model, a plurality of the sealing elements are connected to form a sealing layer, which fills the space between the top cover of the battery cell and the heat insulation plate, and seals and isolates the explosion-proof valves of each battery cell together with the heat insulation plate.

[0011] In an optional embodiment of this utility model, the heat insulation plate is fixedly connected to the battery cell via a ceramic composite strip.

[0012] In an optional embodiment of this utility model, the heat insulation board is made of mica-based high-temperature plastic.

[0013] In an optional embodiment of this utility model, the heat insulation layer is mica paper, and the position of the mica paper corresponding to the opening of the explosion-proof valve is thinned.

[0014] In an optional embodiment of this utility model, the sealing element is ceramic silicone foam.

[0015] In an optional embodiment of this utility model, the protective cover is a mica cover plate.

[0016] This utility model also provides a battery pack, including a housing and a plurality of battery modules disposed in the housing, each of the battery modules being provided with a thermoelectric isolation device as described in any of the above embodiments.

[0017] In an optional embodiment of this utility model, the battery module includes multiple battery cells, and the battery cells and the battery module are connected to each other via a busbar. The thermoelectric isolation device seals and isolates the busbar from the explosion-proof valve on the battery cell.

[0018] The technical advantages of this invention lie in its use of a special structure in the heat insulation plate to guide directional valve opening. Combined with the protective cover, this effectively isolates the high-temperature material ejected during thermal runaway from the cell top cover and electrical components, reducing the risk of short circuits and arcing, and providing effective protection for the CCS acquisition board, extending its effective operating time after thermal runaway. The heat insulation plate and protective cover are made of high-temperature resistant materials, ensuring the stability and reliability of the protective structure under high temperatures. Mica paper is used to cover the explosion-proof valve for thermal isolation, with weak points applied at the corresponding opening positions to reduce heat transfer to adjacent explosion-proof valves while ensuring smooth opening. Ceramic composite tape is used to fix the heat insulation plate, improving the overall integrity and stability of the protective structure. Ceramic silicone foam ensures airtight installation, enhancing thermal and electrical isolation, and also assists the heat insulation plate in directional valve opening. The overall structure is simple and highly stable, achieving reliable thermal and electrical isolation and significantly improving the safety of the battery pack. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial structural diagram of a commonly used thermoelectric isolation protection device;

[0021] Figure 2 This is a partial structural schematic diagram of the thermoelectric isolation device in an optional embodiment of the present invention;

[0022] Figure 3 This is a partial structural disassembly diagram of the thermoelectric isolation device in an optional embodiment of the present invention;

[0023] Figure 4 This is a structural disassembly diagram of the sealing element, heat insulation layer, heat insulation board and wire harness isolation board in an optional embodiment of the present invention.

[0024] Label Explanation:

[0025] 100. Heat insulation board; 200. Protective cover; 300. Heat insulation layer; 400. Sealing component; 500. Battery cell top cover; 600. Electrical components; 700. Ceramic composite tape; 800. Wire harness isolation plate;

[0026] 110, First vent; 120, Protrusion; 410, Second vent; 610, CCS acquisition board; 620, Busbar. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Please see Figure 1 In power battery modules or battery packs, the high-temperature substances ejected by the cell explosion-proof valve during thermal runaway can easily cause short circuits, arcing, and damage to electrical components. When foreign objects fall onto the upper surface of the explosion-proof valve, they can also affect the valve opening action. Existing ceramic heat insulation plates or plastic protective covers are prone to melting and failure due to insufficient high-temperature resistance, and lack an effective isolation path design for high-temperature substances, posing safety hazards.

[0030] Please see Figures 2 to 4This utility model proposes a thermoelectric isolation device, including a heat insulation plate 100, a protective cover 200, a heat insulation layer 300, and a sealing element 400. The heat insulation plate 100 at least partially covers the top cover 500 of the battery cell. The top cover 500 of the battery cell is equipped with an explosion-proof valve and an electrical component 600. The heat insulation plate 100 seals and isolates the explosion-proof valves of each battery cell and guides the explosion-proof valves to achieve directional valve opening, while simultaneously achieving thermal isolation of the top cover 500 of the battery cell. A receiving cavity is formed between the protective cover 200 and the top cover 500 of the battery cell. The electrical component 600 is disposed in the receiving cavity. The protective cover 200 and the heat insulation plate 100 form a thermal runaway evacuation area on the side away from the battery cell. The thermal runaway evacuation area is sealed and isolated from the receiving cavity. After the explosion-proof valve is opened... High-temperature materials will be ejected into the thermal runaway evacuation area. The electrical component 600 is isolated from the thermal runaway ejected material in the thermal runaway evacuation area by the protective cover 200. Both the heat insulation plate 100 and the protective cover 200 are made of high-temperature resistant materials to ensure the integrity of the structure under high temperature and effectively isolate the material ejected after thermal runaway. This provides reliable protection for the electrical component 600 and the cell top cover 500, greatly reducing the risk of thermal runaway. The heat insulation layer 300 can isolate and protect the adjacent explosion-proof valve when thermal runaway occurs. The sealing element 400 is installed between the cell top cover 500 and the heat insulation plate 100 and surrounds the explosion-proof valve to improve the sealing performance at the opening of the explosion-proof valve and further ensure the heat insulation effect. At the same time, it assists the heat insulation plate 100 in forming a directional valve opening. This thermoelectric isolation device forms an effective isolation path between the electrical components 600 and the battery cell top cover 500 and the explosion-proof valve, isolating the high-temperature substances that are subject to thermal runaway. It has a simple structure and reliable protection, and can effectively solve the problem of high-voltage short circuit arcing under thermal runaway, ensuring the best protection effect for the electrical components 600 and extending their effective working time after thermal runaway.

[0031] Please see Figures 2 to 4 In an optional embodiment of this utility model, the heat insulation plate 100 at least partially covers the top cover 500 of the battery cell, and a first vent 110 is provided on it. The first vent 110 is arranged corresponding to the explosion-proof valve on the top cover 500 of the battery cell to guide the directional opening of the valve. At the same time, the heat insulation plate 100 seals and isolates the explosion-proof valve of each battery cell, and isolates the top cover 500 of the battery cell from the explosion-proof valve, so as to prevent the high-temperature substances when the explosion-proof valve explodes from affecting the adjacent explosion-proof valve and the top cover 500 of the battery cell. Specifically, the first vent 110 is aligned with the opening of the explosion-proof valve. The heat insulation plate 100 and the sealing element 400 cooperate with the top cover 500 of the battery cell to seal and isolate the explosion-proof valve of each battery cell. When the explosion-proof valve is opened, the high-temperature material will be ejected outward along the path of the explosion-proof valve opening and the first vent 110 without contacting the top cover 500 of the battery cell. The special structure of the heat insulation plate 100 allows the material ejected during thermal runaway to be discharged along the hole path, realizing directional valve opening or directional discharge, while simultaneously achieving thermal isolation of the top cover 500 of the battery cell.

[0032] Please see Figures 2 to 4In an optional embodiment of the present invention, a protrusion 120 is formed on the heat insulation plate 100. The protrusion 120 extends along the length direction of the heat insulation plate 100 to form a region separated on both sides. The protrusion 120 and the protective cover 200 cooperate to form a mutually isolated thermal runaway evacuation area and a receiving cavity. The explosion-proof valve is located in the thermal runaway evacuation area. Electrical components 600, such as the CCS acquisition board 610 and busbar 620, are installed in the containment cavity and connected to the battery cells. When the explosion-proof valve is opened, the heat insulation plate 100 guides the high-temperature material to be sprayed into the thermal runaway evacuation area through the first vent 110. Under the action of the heat insulation plate 100 and the protective cover 200, the high-temperature ejected material will not accumulate on the side, top, and bottom of the aluminum bar, between the aluminum bar and the tray, or between the battery cells during thermal runaway, thereby effectively reducing the risks of high-voltage short circuits and arcing. At the same time, it can also achieve the protection effect of the CCS acquisition board 610 or the low-voltage acquisition line. After thermal runaway, the voltage and temperature of the entire package can still be collected for a certain period of time, and abnormal values ​​can be output to transmit alarm data to the BMS (Battery Management System) in a timely manner.

[0033] Please see Figures 2 to 4 In an optional embodiment of this utility model, the shape of the protrusion 120 may include, for example, an arc shape adapted to the contour shape of the explosion-proof valve opening. The edge structure of the protective cover 200 is adapted to and engages with the protrusion 120. The protrusion 120, in cooperation with the structure of the first air hole 110, guides the valve opening path, and leaves sufficient space below for the installation and distribution of the electrical components 600. It is understood that the shape and structure of the heat insulation plate 100 are not limited. For example, the heat insulation plate 100 can completely cover the top cover 500 of the battery cell, forming a protrusion 120 in the middle, which engages with the protective cover 200 on one side. In other embodiments, the heat insulation plate 100 can also partially cover the top cover 500 of the battery cell, located on the side where the explosion-proof valve is located, and the other side is insulated by the connection between the heat insulation plate 100 and the protective cover 200. The heat insulation plate 100 may also not have a protrusion 120, as long as it cooperates with the protective cover 200 to insulate the top cover 500 of the battery cell and the electrical components 600.

[0034] Please see Figures 2 to 4 In an optional embodiment of this utility model, the heat insulation plate 100 is connected to the battery cell via a ceramic composite tape 700. Specifically, the ceramic composite tape 700 has double-sided adhesive on its back, with one side attached to the surface of the heat insulation plate 100 and the other side attached to the surface of the battery cell. Replacing the traditional bolt connection with the ceramic composite tape 700 not only simplifies installation but also ensures that the ceramic composite tape 700 maintains its adhesion at high temperatures, preventing the heat insulation plate from falling off due to thermal expansion, thus ensuring high reliability. It also improves the vibration and thermal shock resistance of the heat insulation plate 100.

[0035] Please see Figures 2 to 4In an optional embodiment of this utility model, the protective cover 200 is disposed on one side of the cell top cover 500, forming a receiving cavity between the protective cover 200 and the cell top cover 500. The electrical component 600 is disposed within the receiving cavity, and the explosion-proof valve is located outside the receiving cavity. Specifically, one side of the protective cover 200 engages with the protrusion 120, forming a thermal runaway evacuation area on one side of the protrusion 120. The other side of the protective cover 200 forms a receiving cavity with the cell top cover 500, isolating the electrical component 600 from the high-temperature material in the thermal runaway evacuation area. When the high-temperature material is directionally discharged through the evacuation space, it is prevented from contacting the electrical component 600 and the cell top cover 500 by the isolation provided by the protective cover 200 and the heat insulation plate 100, effectively solving the short-circuit arcing problem. One end of the protective cover 200 can engage with the protrusion 120 of the heat insulation plate 100, ensuring a seal at the connection and preventing high-temperature leakage at the joint from affecting the electrical component 600 below.

[0036] Please see Figures 2 to 4 In an optional embodiment of this utility model, the heat insulation plate 100 is made of mica-based high-temperature plastic, and the protective cover 200 is a mica cover plate. The mica material is resistant to high temperature and can still ensure the integrity and stability of the structure at high temperature. It can effectively isolate the high temperature, high pressure and conductive substances ejected during runaway from the electrical components 600 on the battery cell and the top cover 500 of the battery cell. The protective structure has high reliability and low cost, which solves the problem that the protective structure cannot withstand high temperature (such as the ceramic isolation plate and the plastic protective cover 200 melting at high temperature), and the risk caused by the failure of the protection due to structural damage and destruction during thermal runaway.

[0037] Please see Figures 2 to 4 In an optional embodiment of this utility model, the heat insulation layer 300 is disposed between the heat insulation plate 100 and the top cover 500 of the battery cell, and at least covers the first vent 110, thereby achieving thermal isolation protection for the explosion-proof valve, effectively preventing the ejected material from the thermal runaway battery cell from causing material accumulation and heat transfer to the explosion-proof valve opening of adjacent battery cells. The position on the heat insulation layer 300 corresponding to the opening of the explosion-proof valve should be thinned to facilitate the smooth discharge of high temperature and high pressure inside the battery cell during thermal runaway, without affecting the valve opening action; the structure of the heat insulation layer 300 enhances the local heat insulation capacity while ensuring the normal opening of the explosion-proof valve.

[0038] Specifically, the insulation layer 300 can be made of mica paper, which can be attached between the top cover 500 of the battery cell and the insulation plate 100. The mica paper is placed at the explosion-proof valve opening for protection, effectively isolating the high-temperature substances emitted from the battery cell during thermal runaway and reducing heat transfer to the explosion-proof valves on adjacent battery cells. The position of the mica paper corresponding to the explosion-proof valve opening is weakened, for example, a cross-shaped or arc-shaped groove can be pre-cut at the corresponding explosion-proof valve position, and the depth of the groove can be effectively controlled to ensure structural integrity while allowing the mica paper to break first during thermal runaway, so that the high-temperature gas can break through the weak point and enter the evacuation space, and the ejected material can be discharged in a directional manner along the first vent 110, avoiding obstruction of valve opening.

[0039] Please see Figures 2 to 4 In one optional embodiment of this utility model, the sealing element 400 is disposed on the side of the heat insulation plate 100 near the top cover 500 of the battery cell, and forms a second vent 410 around the explosion-proof valve. The sealing element 400 and the heat insulation plate 100 seal and isolate the explosion-proof valves of each battery cell, preventing the ejected material from the top cover 500 of the battery cell from contacting it when the explosion-proof valve bursts. At the same time, the second vent 410 and the first vent 110 cooperate with the explosion-proof valve port to form a guiding channel, guiding the valve to open in a directional manner and spraying the high-temperature material into the thermal runaway evacuation zone. The sealing element 400 can be, for example, a sealing ring, and is made of a high-temperature resistant material to ensure the stability of the structure under thermal runaway. In other embodiments, for example, a protrusion surrounding the explosion-proof valve can be provided on the side of the heat insulation plate 100 near the top cover 500 of the battery cell as a sealing element 400 to achieve effective isolation between the explosion-proof valve and the top cover of the battery cell.

[0040] Please see Figures 2 to 4 In an optional embodiment of this utility model, multiple sealing elements 400 are connected to form a sealing layer. The sealing layer fills the area between the top cover 500 of the battery cell and the heat insulation plate 100, sealing and isolating the explosion-proof valves of each battery cell together with the heat insulation plate 100. A second vent 410 is provided on the sealing element 400, and the position and shape of the second vent 410 are consistent with those of the first vent 110. The sealing layer can absorb the stacking error and flatness error of the battery cells, forming a seal on the explosion-proof valve opening. The second vent 410 assists the high-temperature plastic to form a directional valve opening and a directional discharge of high-temperature substances. Furthermore, an inclined surface can be provided at the edge of each vent. The first vent 110, the second vent 410, and the explosion-proof valve form a continuous flow channel, guiding the ejected material to diffuse to the far end of the evacuation area, reducing the probability of it falling into the explosion-proof valve opening of adjacent battery cells.

[0041] Specifically, the sealing element 400 can be, for example, ceramic silicone foam, which forms a sealing layer and fills between the battery cell top cover 500 and the heat insulation plate 100. The front and back sides of the ceramic silicone foam can be covered with double-sided adhesive to bond the heat insulation plate 100 and the battery cell top cover 500 together for easy installation. The foam is designed with an appropriate compression amount to absorb battery cell stacking errors and flatness errors, forming a seal on the explosion-proof valve opening. A second vent 410 aligned with the first vent 110 is opened on the surface to assist the high-temperature plastic in forming a directional valve opening and directional discharge of high-temperature substances. The elastic compression of the foam compensates for thickness errors, covering the gap between the top cover 500 of the battery cell and the heat insulation plate 100, ensuring airtightness and preventing ejected material from seeping into the containment cavity. The ceramic silicone foam also has both sealing and high-temperature resistance, ensuring the sealing of the explosion-proof valve port, reducing gas leakage paths, and further isolating the electrical components 600 to reduce the risk of short circuits. The second vent 410 cooperates with the first vent 110 on the heat insulation plate 100 to form a valve opening channel, enabling the directional discharge of high-temperature substances, ensuring unobstructed discharge channels for ejected material, and the foam can also absorb vibration and impact, reducing the risk of structural misalignment.

[0042] Please see Figures 2 to 4 This utility model also proposes a battery pack, including a housing and multiple battery modules disposed within the housing. Each battery module is equipped with a thermoelectric isolation device as described in the above embodiments. The thermoelectric isolation device can effectively prevent high-temperature substances ejected during thermal runaway of the battery cells from contacting the cell cover and the electrical components 600 in the battery module. Specifically, each battery module includes multiple battery cells, and the cells and battery modules are connected to each other via a busbar 620. The thermoelectric isolation device can seal and isolate the busbar 620 from the explosion-proof valve on the battery cell, preventing thermal runaway ejected substances from contacting the busbar 620. The thermoelectric isolation devices of each battery module work together to achieve effective isolation and protection at locations such as between adjacent aluminum bars of a single module, between aluminum bars of adjacent modules, and between the module aluminum bars and the housing, reducing the risk of short circuits.

[0043] Please see Figures 2 to 4 Figures 2 to 4 Figures 2 to 4 In an optional embodiment of this utility model, a wire harness isolation plate 800 is further provided on the battery module for fixing the electrical components 600 and the protective cover 200. The electrical components 600 include a CCS acquisition board 610 for signal acquisition and a bus 620 for connecting the cells and the battery modules. The bus 620 can be, for example, a copper bar or an aluminum bar. The CCS acquisition board 610 and the bus 620 are fixed on the wire harness isolation plate 800 and connected to the cells. The protective cover 200 is connected to and fixed to the wire harness isolation plate 800.

[0044] Specifically, the wire harness isolation plate 800 includes, for example, multiple continuous frame structures. The busbar 620 and the CCS acquisition board 610 are mounted on the frame and pass through the frame on the wire harness isolation plate 800 to connect with each cell terminal. The mica cover plate is connected and fixed to the frame structure of the wire harness isolation plate 800. The edge of the wire harness isolation plate 800 can be engaged with the edge of the protrusion 120 of the heat insulation plate 100. The aluminum bus and the CCS acquisition board 610 are engaged and fixed within the frame of the wire harness isolation plate 800. The wire harness isolation plate 800 restricts the CCS acquisition board 610 and the aluminum bus to a preset position to avoid displacement that could cause line wear, thus ensuring stable operation.

[0045] In summary, the thermoelectric isolation device and battery pack of this utility model isolate thermal runaway ejected materials from electrical components 600 through the partitioned cooperation of the heat insulation plate 100 and the protective cover 200. The use of high-temperature resistant materials ensures the structural integrity and reliability under high temperatures, improving the protection effect and significantly reducing the risk of thermal runaway caused by short circuits. It also provides good protection for the CCS acquisition board 610 or acquisition lines, allowing for voltage and temperature acquisition of the entire pack for a certain period after thermal runaway. Thin mica paper is used to protect the explosion-proof valve while ensuring its normal operation, preventing heat transfer from high-temperature substances to the explosion-proof valves of adjacent cells, thus preventing damage to their function. The ceramic composite strip 700 is used for fixed installation, ensuring high reliability. Ceramic silicone foam ensures airtight installation, improving the thermoelectric isolation effect, and simultaneously assists the heat insulation plate 100 in directional valve opening. The overall structure is simple and highly stable, effectively preventing thermal runaway ejected materials from affecting the cells and electrical components 600, achieving reliable thermoelectric isolation and improving the safety of the battery pack.

[0046] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0047] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0048] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0049] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0050] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0051] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0052] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0053] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0054] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A thermoelectric isolation device, characterized in that, include: A heat insulation plate at least partially covers the top cover of the battery cell. The heat insulation plate has a first air hole, which is arranged corresponding to the explosion-proof valve on the top cover of the battery cell. The heat insulation plate seals and isolates the explosion-proof valve of each battery cell. The insulation layer at least covers the first pore; A protective cover is provided, and a receiving cavity is formed between the protective cover and the top cover of the battery cell, and electrical components are disposed within the receiving cavity; The protective cover and the heat insulation plate form a thermal runaway evacuation area on the side away from the battery cell, and the thermal runaway evacuation area is sealed and isolated from the receiving cavity.

2. The thermoelectric isolation device according to claim 1, characterized in that, A sealing element is provided on the side of the heat insulation plate near the top cover of the battery cell. The sealing element forms a second vent around the explosion-proof valve, which seals and isolates the explosion-proof valve of each battery cell from the heat insulation plate.

3. The thermoelectric isolation device according to claim 2, characterized in that, Multiple sealing elements are connected to form a sealing layer, which fills the space between the top cover of the battery cell and the heat insulation plate, and seals and isolates the explosion-proof valves of each battery cell together with the heat insulation plate.

4. The thermoelectric isolation device according to claim 1, characterized in that, The heat insulation plate is fixedly connected to the battery cell via a ceramic composite strip.

5. The thermoelectric isolation device according to claim 1, characterized in that, The insulation board is made of mica-based high-temperature plastic.

6. The thermoelectric isolation device according to claim 1, characterized in that, The heat insulation layer is mica paper, and the position of the mica paper corresponding to the opening of the explosion-proof valve is thinned.

7. The thermoelectric isolation device according to claim 3, characterized in that, The sealing element is ceramic silicone foam.

8. The thermoelectric isolation device according to claim 1, characterized in that, The protective cover is a mica cover plate.

9. A battery pack, characterized in that, It includes a housing and a plurality of battery modules disposed within the housing, each of the battery modules being provided with a thermoelectric isolation device as described in any one of claims 1 to 8.

10. The battery pack according to claim 9, characterized in that, The battery module includes multiple battery cells, and the battery cells and the battery modules are connected to each other via a busbar. The thermoelectric isolation device seals and isolates the busbar from the explosion-proof valve on the battery cell.

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