Battery device, energy storage device, charging network and energy storage system

Abstract

The utility model relates to the technical field of battery devices. The utility model provides a battery device, an energy storage device, a charging network and an energy storage system. The battery device comprises a plurality of single batteries and an acquisition assembly. Each battery monomer comprises a top cover and an insulating sheet, the insulating sheet is stacked on one side of the top cover, the plurality of battery monomers at least comprise a first battery monomer, and the insulating sheet of the first battery monomer is provided with a first opening. The plurality of single batteries are positioned on the same side of the acquisition assembly, and the acquisition assembly comprises an isolation plate and an acquisition structure. The insulation sheet is located between the isolation plate and the top cover, the isolation plate is provided with a second opening, and the second opening is opposite to the first opening. The collection structure is arranged at the second opening and comprises a temperature collection piece and a first heat conduction pad, and the first heat conduction pad abuts against the top cover through the first opening. The temperature acquisition piece is directly contacted with the top cover through the first heat conduction pad, so that the response speed and the detection precision of the temperature acquisition piece can be improved, and conditions such as thermal runaway of the battery device can be avoided.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery device, an energy storage device, a charging network, and an energy storage system. Background Technology

[0002] In related technologies, the battery device includes multiple battery cells and a data acquisition component, with the battery cells located on the same side of the data acquisition component. The data acquisition component includes a separator, a heat exchanger, and a temperature sensor. The separator is located between the heat exchanger and the battery cells, and the temperature sensor is installed on the side of the heat exchanger facing away from the battery cells. In other words, the heat from the battery cells is conducted to the temperature sensor via the heat exchanger. This heat conduction path is long and complex, and has high thermal resistance, resulting in low detection accuracy of the temperature sensor. Utility Model Content

[0003] In view of this, embodiments of this application provide a battery device, an energy storage device, a charging network, and an energy storage system that can improve the detection accuracy of temperature acquisition devices.

[0004] Therefore, according to a first aspect of the embodiments of this application, a battery device is provided, comprising: a plurality of battery cells, each battery cell including a top cover and an insulating sheet, the insulating sheet being stacked on one side of the top cover, the plurality of battery cells including at least a first battery cell, the insulating sheet of the first battery cell having a first opening; a collection assembly, the plurality of battery cells being located on the same side of the collection assembly, the collection assembly including: an isolation plate, the insulating sheet being located between the isolation plate and the top cover, the isolation plate having a second opening, the second opening being disposed opposite to the first opening; and a collection structure disposed at the second opening, the collection structure including a temperature collection element and a first thermally conductive pad, the first thermally conductive pad abutting against the top cover through the first opening.

[0005] The battery device provided in this application includes multiple battery cells and a data acquisition assembly. The multiple battery cells are located on the same side of the data acquisition assembly. The data acquisition assembly includes a separator and a data acquisition structure.

[0006] The battery cells are categorized into several types, ensuring that each battery cell includes at least a first battery cell. The insulating sheet of the first battery cell has a first opening. The insulating sheet is located between a separator and a top cover. A second opening is located on the portion of the separator opposite the first opening, and the first and second openings communicate with each other. A temperature sensing structure is located at the second opening and includes a temperature sensing element and a first thermally conductive pad. The first thermally conductive pad abuts against the top cover through the first opening.

[0007] Compared to related technologies where the temperature sensor is mounted on the side of the heat exchanger away from the battery cell, this method shortens the heat conduction path. Heat can be conducted from the top cover of the first battery cell through the first thermal pad to the temperature sensor. The temperature sensor directly contacts the top cover via the first thermal pad, eliminating intermediate transmission paths (such as the heat exchanger and separator). This improves the response speed of the temperature sensor, enabling real-time temperature acquisition, reducing response lag, and enhancing detection accuracy. This helps prevent thermal runaway in the battery device, thus improving the safety and reliability of the product.

[0008] Understandably, the temperature acquisition device measures the top cover and is not affected by the Joule heat of the battery itself. Therefore, it can reduce environmental interference to the temperature acquisition device. The measured value of the temperature acquisition device does not include the error caused by the heating of the battery, and can more accurately reflect the temperature of the battery cell, thus improving the detection accuracy of the temperature acquisition device.

[0009] In addition, the first thermal pad abuts against the top cover through the first opening. The first thermal pad can not only squeeze air to fill the air gap and reduce the contact thermal resistance, but also has an insulating and buffering effect, so that heat can be transferred from the top cover to the temperature acquisition device in a timely and effective manner, which is conducive to further improving the detection accuracy of the temperature acquisition device.

[0010] Optionally, the acquisition structure also includes: a bracket, which is connected to an isolation plate, and the temperature acquisition element and the first thermal pad are both located on the bracket, with the first thermal pad located between the temperature acquisition element and the top cover.

[0011] The bracket can define the positional relationship between the temperature sensor and the first thermal pad, and can define the mating dimensions between the temperature sensor and the first thermal pad. This prevents the temperature sensor from shifting relative to the first thermal pad during assembly, optimizes the heat conduction path, and reduces temperature deviation of the temperature sensor caused by assembly errors.

[0012] In addition, the bracket, as the mounting carrier for the temperature acquisition device, also serves to protect the temperature acquisition device. It can prevent the temperature acquisition device from being damaged by accidental collisions or squeezing during transportation or use, thus helping to extend the product's service life.

[0013] Optionally, the bracket has a third opening, a first thermal pad is located on the side of the bracket facing the top cover, and a temperature acquisition element is located at the third opening, with the temperature acquisition element abutting against the first thermal pad.

[0014] The third opening serves to house the temperature sensor, which contacts the first thermal pad through this opening. Heat can be conducted through the top cover to the first thermal pad, and then through the first thermal pad to the temperature sensor, further optimizing the heat conduction path and achieving the shortest and most direct heat transfer from the battery cell to the temperature sensor. This reduces the obstruction to heat transfer between the first thermal pad and the temperature sensor, thereby further improving response speed and detection accuracy.

[0015] Optionally, the acquisition structure also includes a thermally conductive adhesive layer, through which the temperature acquisition element is connected to the first thermally conductive pad.

[0016] The temperature acquisition element and the first thermal pad are bonded together by a thermally conductive adhesive layer. The thermally conductive adhesive layer not only connects the temperature acquisition element and the first thermal pad, but also conducts heat, reducing heat loss and enabling heat to be transferred to the temperature acquisition element in a timely and effective manner, thereby improving the detection accuracy of the temperature acquisition element.

[0017] Optionally, the third opening has a first wall and a second wall facing each other in a first direction, and the temperature acquisition element is located between the first wall and the second wall.

[0018] The temperature sensor is not blocked by the first and second walls, which limits the mating structure between the temperature sensor and the first thermal pad, ensuring the path of heat transfer.

[0019] Optionally, along the second direction, the distance between at least one of the first and second wall surfaces and the temperature acquisition element gradually increases.

[0020] The temperature sensor has a more stable contact surface with the first thermal pad, allowing the temperature sensor to make effective contact with the first thermal pad. The temperature sensor is also easier to insert into the third opening, which has the advantage of facilitating assembly and improving the smoothness and efficiency of assembly.

[0021] Optionally, a portion of the bracket is a heat-conducting part, which is connected between the first heat-conducting pad and the temperature acquisition element.

[0022] The thermally conductive part serves to connect the first thermally conductive pad and the temperature acquisition device. It also conducts heat, further optimizing the heat conduction path and achieving the shortest and most direct heat transfer from the battery cell to the temperature acquisition device. This reduces the obstruction of heat transfer between the first thermally conductive pad and the temperature acquisition device, thereby further improving the response speed and detection accuracy.

[0023] Optionally, the connection structure of the bracket and the partition plate includes any one or a combination of the following: snap-fit ​​connection, screw connection, adhesive connection and magnetic connection.

[0024] The fitting structure of the bracket and the isolation plate is refined. The bracket and the isolation plate can be detached and connected, which has the advantage of being easy to disassemble and assemble, and facilitates subsequent maintenance and repair.

[0025] Optionally, the acquisition structure also includes: a cover, which is detachably connected to the bracket, the cover being located on the side of the temperature acquisition element away from the first thermal pad, and the cover being used to press and fix the temperature acquisition element along the direction from the insulating sheet to the top cover.

[0026] When the cover is connected to the bracket, the cover can press and fix the temperature acquisition element along the direction from the insulating sheet to the top cover. The temperature acquisition element is pressed and fixed by interference fit, which effectively limits the fit size of the top cover, the first thermal pad and the temperature acquisition element, so that the temperature acquisition element and the first thermal pad fit tightly together, which can reduce the contact thermal resistance and improve the detection accuracy of the temperature acquisition element.

[0027] Optionally, the acquisition structure further includes a second thermal pad, which abuts against the cover and the temperature acquisition element.

[0028] The first and second thermal pads work together to seal the temperature acquisition device, which reduces heat loss and improves the response speed of the temperature acquisition device. The temperature acquisition device can collect temperature in real time, reducing response lag and improving the detection accuracy of the temperature acquisition device.

[0029] Optionally, the first battery cell further includes an explosion-proof valve, a first terminal post, and a second terminal post, all of which expose insulating sheets; along the second direction, the explosion-proof valve is located between the first terminal post and the second terminal post, and a first opening is located between the explosion-proof valve and the first terminal post, with the first opening being closer to the explosion-proof valve than the first terminal post.

[0030] During charging and discharging, the first and second terminals are the main heat sources. The first opening is positioned between the explosion-proof valve and the first terminal, and is closer to the explosion-proof valve than the first terminal. In other words, the temperature acquisition device is located between the explosion-proof valve and the first terminal, and is closer to the explosion-proof valve than the first terminal. This reduces the impact of the first and second terminals on the detection accuracy of the temperature acquisition device, ensuring that the detection data accurately reflects the temperature of the individual battery cells.

[0031] Optionally, along the second direction, the first opening is arranged at intervals from the first pole post.

[0032] By defining the positional relationship between the first opening and the first electrode, the positional relationship between the temperature acquisition element and the first electrode is indirectly defined; that is, along the second direction, the first electrode and the temperature acquisition element are arranged at intervals. By refining the positional relationship between the first opening and the first electrode, the distance between the first electrode and the temperature acquisition element is further increased, so that the temperature acquisition element is relatively far away from the region where the temperature and pressure rise most rapidly and drastically, thus reducing the influence of the first electrode on the temperature acquisition element.

[0033] A second aspect of this application provides an energy storage device, including the battery device of the first aspect of this application. Since the energy storage device includes the battery device of the first aspect of this application, it possesses all the beneficial technical effects of the battery device, which will not be elaborated further here.

[0034] A third aspect of this application provides a charging network that includes the energy storage device of the second aspect of this application. Since the charging network includes the energy storage device of the second aspect of this application, it possesses all the beneficial technical effects of the energy storage device, which will not be elaborated further here.

[0035] A fourth aspect of this application provides an energy storage system, including the energy storage device of the second aspect of this application. Since the energy storage system includes the energy storage device of the second aspect of this application, it possesses all the beneficial technical effects of the energy storage device, which will not be elaborated further here.

[0036] Additional aspects and advantages of embodiments of this application will be set forth in the following description, in part will be obvious from the description or may be learned by practice of embodiments of this application. Attached Figure Description

[0037] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 This is a schematic diagram of the structure of the energy storage device in some embodiments of this application;

[0039] Figure 2 This is a schematic diagram of the charging network structure in some embodiments of this application;

[0040] Figure 3 This is a schematic diagram of the energy storage system in some embodiments of this application;

[0041] Figure 4 This is a schematic diagram of the structure of the battery device in some embodiments of this application;

[0042] Figure 5 for Figure 4 A partial enlarged view of point A of the battery device shown;

[0043] Figure 6 This is a schematic diagram of the first part of the battery device in some embodiments of this application;

[0044] Figure 7 This is a schematic diagram of the second part of the battery device in some embodiments of this application;

[0045] Figure 8 This is a schematic diagram of the structure of the first battery cell in some embodiments of this application;

[0046] Figure 9 This is a schematic diagram of the structure of the acquisition component in some embodiments of this application;

[0047] Figure 10 for Figure 9 A magnified view of part B of the acquisition component shown;

[0048] Figure 11 This is a partial structural diagram of the acquisition component in some embodiments of this application;

[0049] Figure 12 for Figure 11 A magnified view of point C of the acquisition component shown;

[0050] Figure 13 This is a schematic diagram of the structure of the bracket, the first thermal pad, and the temperature acquisition element in some embodiments of this application;

[0051] Figure 14 This is a schematic diagram of the structure of the cover and the second thermal pad in some embodiments of this application;

[0052] Figure 15 This is a first-view structural schematic diagram of the bracket in some embodiments of this application;

[0053] Figure 16 This is a second-view structural schematic diagram of the bracket in some embodiments of this application;

[0054] Figure 17 This is a third-view structural schematic diagram of the bracket in some embodiments of this application.

[0055] in, Figures 1 to 17 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0056] 1 energy storage device, 10 energy storage boxes, 2 charging network, 20 charging piles, 3 energy storage system, 30 energy storage converters, 4 power generation device;

[0057] 5 Battery device, 50 Battery cell, 50a First battery cell, 501 Top cover, 502 Insulating sheet, 503 First opening, 504 Explosion-proof valve, 505 First pole, 506 Second pole, 51 Data acquisition component, 511 Isolation plate, 512 Second opening, 513 Data acquisition structure, 514 Temperature acquisition element, 515 First thermally conductive pad, 516 Bracket, 517 Third opening, 518 Thermally conductive adhesive layer, 519 First wall surface, 520 Second wall surface, 521 Thermally conductive part, 522 Cover, 523 Second thermally conductive pad, 524 First snap-fit ​​part, 525 Second snap-fit ​​part. Detailed Implementation

[0058] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0059] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0060] The following reference Figures 1 to 17 This application describes battery devices, energy storage devices, charging networks, and energy storage systems according to some embodiments.

[0061] Currently, with the promotion and popularization of the concept of green development, the application of new energy batteries in daily life and industry is becoming increasingly widespread. Energy storage devices are also being used in more and more scenarios.

[0062] The battery unit comprises multiple battery cells and a data acquisition component. The data acquisition component includes a contact plate, a separator, and a temperature sensor. Battery cells are connected and energized by contact plates, which isolate the contact plates. The temperature of the battery cells is sampled by the temperature sensor and sent to the battery unit's management system for control.

[0063] In related technologies, the temperature acquisition device is fixed on the side of the heat exchanger facing away from the battery cell. Heat from the battery cell is conducted to the temperature acquisition device via the heat exchanger. The heat exchanger is a metal component and is thermally conductive. However, there is contact thermal resistance at the connection points between the heat exchanger and the battery cell, and between the heat exchanger and the temperature acquisition device. This significantly slows down the heat transfer rate, resulting in a response lag in the temperature acquisition device's detection. When the temperature of the battery cell suddenly rises, the temperature acquisition device needs a certain delay to detect the temperature change, increasing the probability of thermal runaway in the battery device and reducing its safety and reliability. Furthermore, the heat conduction path from the battery cell to the temperature acquisition device via the heat exchanger is long and complex. The temperature acquisition device's data includes not only the heat from the battery cell but also the heat generated by the heat exchanger itself. This makes it impossible to accurately reflect the actual state of the battery cell, leading to significant measurement data deviations. Therefore, mounting the temperature acquisition device on the heat exchanger results in low detection accuracy and slow response speed, significantly reducing the performance of the battery device.

[0064] Based on the above considerations, in order to improve the detection accuracy and response speed of the temperature acquisition device, this application proposes a battery device 5. A first opening 503 is provided on the insulating sheet 502 of the battery cell 50, and a second opening 512 is provided on the isolation plate 511 of the acquisition component 51. The second opening 512 is arranged opposite to the first opening 503. The acquisition structure 513 is placed at the second opening 512, eliminating the intermediate transmission path (such as the insulating sheet and the isolation plate), which can improve the response speed of the temperature acquisition device 514, avoid thermal runaway of the battery device 5, and improve the safety and reliability of the product.

[0065] The battery device 5 disclosed in this application is used as a power source for an electrical device or as an energy storage device using the battery device 5 as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. The energy storage device 1 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage power stations can store electrical energy during periods of low electricity demand and provide power to relevant users or electrical equipment during peak demand periods. Wind power generation systems can convert wind energy collected by wind turbine generators into electrical energy, which is then stored by the energy storage device 1. Solar power generation systems can convert solar energy into electrical energy, which is then stored by the energy storage device 1 and supplied to users as needed. Mobile power systems can supply power to electrical equipment in areas inaccessible by the mains power grid, such as remote mountainous regions and isolated wilderness areas. Temporary power systems can provide power to users when the power supply is insufficient.

[0066] The energy storage device 1 disclosed in this application includes an energy storage container, an energy storage cabinet, and a battery swapping station, etc.

[0067] like Figure 1 As shown in the figure, this application embodiment provides an energy storage device 1, which includes an energy storage housing 10 and a battery device 5. The battery device 5 is disposed inside the energy storage housing 10. The number of battery devices 5 can be one or more.

[0068] like Figure 2 As shown in the figure, this application embodiment provides a charging network 2, which includes a charging pile 20 for charging electrical equipment. The charging network 2 may also include an energy storage device 1, which is electrically connected to the charging pile 20 and provides electrical energy to the charging pile 20.

[0069] It should be noted that the charging pile 20 is electrically connected to the battery cells 50 in the energy storage device 1 via cables, and the battery cells 50 can supply the stored electrical energy to the charging pile 20. The charging pile 20 has a connector that can be connected to electrical equipment, thereby replenishing the energy of the equipment. The application of the energy storage device 1 in the charging network 2 can effectively improve the reliability of the charging network 2.

[0070] In a charging network 2, there can be one charging pile 20, and the energy storage device 1 provides power to the one charging pile 20; there can also be multiple charging piles 20, and the energy storage device 1 provides power to multiple charging piles 20.

[0071] As an example, such as Figure 2 As shown, the charging network 2 includes an energy storage device 1 and two charging piles 20, with the energy storage device 1 providing power to the two charging piles 20.

[0072] The energy storage device 1 may include a battery device 5, which is electrically connected to the charging pile 20 so that the battery device 5 can provide power to the charging pile 20.

[0073] like Figure 3 As shown in the figure, this application embodiment provides an energy storage system 3. The energy storage system 3 includes an energy storage converter 30, which can be electrically connected to a power generation device 4 to convert the electrical power provided by the power generation device 4. The energy storage system 3 may also include an energy storage device 1, which is electrically connected to the energy storage converter 30. The energy storage converter 30 converts the electrical energy provided by the power generation device 4 and then stores it in the energy storage device 1.

[0074] An energy storage converter 30 is used to connect between the power generation device 4 and the energy storage device 1. The power generation device 4 generates electrical energy and stores the generated electrical energy in the energy storage device 1 via the energy storage converter 30. The application of the energy storage device 1 in the energy storage system 3 can effectively improve the reliability of the energy storage system 3. In specific implementations, the power generation device 4 can be a solar panel, a hydroelectric power generation device, a thermal power generation device, etc. This application does not limit the specific type of the power generation device 4.

[0075] As an example, such as Figure 3 As shown, the energy storage system 3 includes an energy storage device 1 and an energy storage converter 30. The two power generation devices 4 transmit the generated electrical energy to the energy storage converter 30, and the energy storage converter 30 imports the electrical energy into the energy storage device 1 for storage.

[0076] like Figure 4 , Figure 5 , Figure 9 , Figure 10 , Figure 11 and Figure 12As shown, the battery device 5 according to the first aspect embodiment of this application includes: a plurality of battery cells 50, each battery cell 50 including a top cover 501 and an insulating sheet 502, the insulating sheet 502 being stacked on one side of the top cover 501, the plurality of battery cells 50 including at least a first battery cell 50a, the insulating sheet 502 of the first battery cell 50a having a first opening 503; a collection assembly 51, the plurality of battery cells 50 being located on the same side of the collection assembly 51, the collection assembly 51 including: an isolation plate 511, the insulating sheet 502 being located between the isolation plate 511 and the top cover 501, the isolation plate 511 having a second opening 512, the second opening 512 being disposed opposite to the first opening 503; and a collection structure 513 disposed at the second opening 512, the collection structure 513 including a temperature collection element 514 and a first thermal pad 515, the first thermal pad 515 abutting against the top cover 501 through the first opening 503.

[0077] The battery device 5 includes multiple battery cells 50 and a data acquisition assembly 51. The multiple battery cells 50 are located on the same side of the data acquisition assembly 51. The data acquisition assembly 51 includes a separator 511 and a data acquisition structure 513.

[0078] The multiple battery cells 50 are categorized such that at least one first battery cell 50a is included. The insulating sheet 502 of the first battery cell 50a has a first opening 503. The insulating sheet 502 is located between the separator 511 and the top cover 501. The portion of the separator 511 opposite to the first opening 503 has a second opening 512, and the first opening 503 communicates with the second opening 512. A sensing structure 513 is located at the second opening 512. The sensing structure 513 includes a temperature sensing element 514 and a first thermally conductive pad 515, which abuts against the top cover 501 through the first opening 503.

[0079] For example, the plurality of battery cells 50 also includes a second battery cell. The insulating sheet of the second battery cell does not have a first opening; that is, the structure of the insulating sheet of the second battery cell is different from the structure of the insulating sheet 502 of the first battery cell 50a. The rest of the second battery cell, except for the insulating sheet, has the same structure as the first battery cell 50a. In other words, the acquisition structure 513 is not located at the second battery cell.

[0080] For example, the number of first battery cells 50a and the number of acquisition structures 513 are the same, and each acquisition structure 513 is paired with one first battery cell 50a. When there is one first battery cell 50a, there is one acquisition structure 513. When there are multiple first battery cells 50a, there are multiple acquisition structures 513, and multiple first battery cells 50a and multiple acquisition structures 513 are paired in a one-to-one correspondence.

[0081] Compared to related technologies where the temperature acquisition element is installed on the side of the heat exchanger away from the battery cell, the heat conduction path is shortened. Heat can be conducted from the top cover 501 of the first battery cell 50a to the temperature acquisition element 514 via the first thermal pad 515. The temperature acquisition element 514 directly contacts the top cover 501 through the first thermal pad 515, eliminating intermediate transmission paths (such as the heat exchanger and the separator). This improves the response speed of the temperature acquisition element 514, enabling it to acquire temperature in real time, reducing response lag, improving detection accuracy, and preventing thermal runaway of the battery device 5. This contributes to improving the safety and reliability of the product.

[0082] It is understandable that the temperature acquisition device 514 measures the top cover 501 and is not affected by the Joule heat of the battery cell itself. Therefore, it can reduce the environmental interference to the temperature acquisition device 514. The measurement value of the temperature acquisition device 514 does not include the error caused by the heating of the battery cell, and can more accurately reflect the temperature of the battery cell 50, thereby improving the detection accuracy of the temperature acquisition device 514.

[0083] In addition, the first thermal pad 515 abuts against the top cover 501 through the first opening 503. The first thermal pad 515 can not only squeeze air to fill the air gap and reduce the contact thermal resistance, but also has an insulating and buffering function, so that heat can be transferred from the top cover 501 to the temperature acquisition element 514 in a timely and effective manner, which is conducive to further improving the detection accuracy of the temperature acquisition element 514.

[0084] Exemplarily, the battery cell 50 includes a housing assembly and an electrode assembly, with the electrode assembly located within the housing assembly. The electrode assembly is the component in the battery cell 50 where the electrochemical reaction occurs. The housing assembly encloses the electrode assembly and isolates it from the external environment. The housing assembly includes a top cover 501 and a housing, with the top cover 501 disposed on the housing. An insulating sheet 502 is disposed on the top cover 501. The shape of the top cover 501 can be adapted to the shape of the housing to fit the housing. Optionally, the top cover 501 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover 501 is not easily deformed under pressure and impact, enabling the battery cell 50 to have higher structural strength and improved reliability. The material of the top cover 501 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0085] The separator 511 can be made of insulating materials, such as cellulose, hard rubber, polyethylene, etc. The separator 511 can provide a place for the battery cells and flexible circuit boards, and can also insulate and separate multiple battery cells, thereby insulating and separating the positive and negative electrodes of the battery cells 50 and reducing the probability of short circuit in the battery device 5.

[0086] Temperature acquisition element 514 is used to acquire the temperature of battery cell 50. First thermal pad 515 has a thermal conduction function to accelerate the heat conduction to temperature acquisition element 514.

[0087] The insulating sheet 502 serves an insulating function and provides structural support for improving the safety and reliability of the battery device 5.

[0088] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 13 , Figure 15 , Figure 16 and Figure 17 As shown, in some embodiments, the acquisition structure 513 further includes: a bracket 516, which is connected to the isolation plate 511. The temperature acquisition element 514 and the first thermal pad 515 are both disposed on the bracket 516, and the first thermal pad 515 is located between the temperature acquisition element 514 and the top cover 501.

[0089] The acquisition structure 513 also includes a bracket 516, which is connected to the isolation plate 511. That is, the bracket 516 is located at the second opening 512, and the bracket 516 is connected to the wall of the second opening 512 of the isolation plate 511.

[0090] Both the temperature acquisition element 514 and the first thermal pad 515 are mounted on the bracket 516. That is, the bracket 516 serves as the mounting carrier for the temperature acquisition element 514 and the first thermal pad 515, and has the function of mounting and fixing the temperature acquisition element 514 and the first thermal pad 515. It can limit the positional relationship between the temperature acquisition element 514 and the first thermal pad 515, and limit the mating dimensions between the temperature acquisition element 514 and the first thermal pad 515. This prevents the temperature acquisition element 514 from shifting relative to the first thermal pad 515 during assembly, optimizes the heat conduction path, and reduces the temperature deviation of the temperature acquisition element 514 caused by assembly errors.

[0091] In addition, the bracket 516 serves as the mounting carrier for the temperature acquisition element 514 and also protects the temperature acquisition element 514. It can prevent the temperature acquisition element 514 from being damaged by accidental collisions or squeezing during transportation or use of the battery device 5, which helps to extend the service life of the product.

[0092] It is understandable that the first thermal pad 515 is in contact with the top cover 501 of the first battery cell 50a. The temperature of the top cover 501 is the most direct reflection of the internal temperature of the first battery cell 50a. The first thermal pad 515 has thermal conductivity and can absorb the temperature of the top cover 501 in a timely manner. The heat can be quickly conducted to the temperature acquisition element 514, which is beneficial to improving the detection accuracy of the temperature acquisition element 514 and accelerating the response speed of the temperature acquisition element 514.

[0093] like Figure 13 and Figure 16 As shown, in some embodiments, the bracket 516 is provided with a third opening 517, the first thermal pad 515 is provided on the side of the bracket 516 facing the top cover 501, the temperature acquisition element 514 is located at the third opening 517, and the temperature acquisition element 514 abuts against the first thermal pad 515.

[0094] Among them, the cooperation structure of the bracket 516, the first thermal pad 515 and the temperature acquisition element 514 is refined.

[0095] The bracket 516 has a third opening 517. A first thermal pad 515 is located on the side of the bracket 516 facing the top cover 501. A temperature sensor 514 is located at the third opening 517, which houses the temperature sensor 514. The temperature sensor 514 abuts against the first thermal pad 515 through the third opening 517. In other words, the temperature sensor 514 is in direct contact with the first thermal pad 515. Alternatively, the first thermal pad 515 connects the top cover 501 and the temperature sensor 514. Heat can be conducted from the top cover 501 to the first thermal pad 515, and then from the first thermal pad 515 to the temperature sensor 514, further optimizing the heat conduction path and achieving the shortest and most direct heat transfer from the battery cell 50 to the temperature sensor 514. This reduces the obstruction to heat transfer between the first thermal pad 515 and the temperature sensor 514, further improving response speed and detection accuracy.

[0096] It is understandable that the opening wall of the third opening 517 is located on the periphery of the temperature acquisition element 514, and the bracket 516 will not obstruct the heat transfer between the first thermal pad 515 and the temperature acquisition element 514, nor will it obstruct the assembly of the first thermal pad 515 and the temperature acquisition element 514.

[0097] The first thermal pad 515 covers the third opening 517 to prevent moisture, dirt, etc. in the environment from flowing to the battery cell 50 through the third opening 517.

[0098] Alternatively, depending on the actual usage requirements, the first thermal pad 515 may cover a portion of the third opening 517.

[0099] like Figure 6As shown, in some embodiments, the acquisition structure 513 further includes a thermally conductive adhesive layer 518, and the temperature acquisition element 514 is connected to the first thermally conductive pad 515 through the thermally conductive adhesive layer 518.

[0100] The acquisition structure 513 also includes a thermally conductive adhesive layer 518, which is connected to the temperature acquisition element 514 and also connected to the first thermally conductive pad 515. That is, the temperature acquisition element 514 is connected to the first thermally conductive pad 515 through the thermally conductive adhesive layer 518.

[0101] For example, the thermally conductive adhesive layer 518 is located between the temperature sensor 514 and the first thermally conductive pad 515.

[0102] The temperature acquisition element 514 and the first thermal pad 515 are bonded together by a thermally conductive adhesive layer 518. The thermally conductive adhesive layer 518 not only connects the temperature acquisition element 514 and the first thermal pad 515, but also conducts heat, reducing heat loss and enabling heat to be transferred to the temperature acquisition element 514 in a timely and effective manner, thereby improving the detection accuracy of the temperature acquisition element 514.

[0103] For example, the thermally conductive adhesive layer 518 includes silicone adhesive layers and polyurethane adhesive layers, etc., which will not be listed here.

[0104] like Figure 13 As shown, in some embodiments, the opening wall of the third opening 517 has opposing first wall surfaces 519 and second wall surfaces 520 in a first direction, and the temperature acquisition element 514 is located between the first wall surfaces 519 and the second wall surfaces 520.

[0105] The third opening 517 includes a first wall surface 519 and a second wall surface 520, which are arranged opposite to each other in a first direction. The temperature sensing element 514 abuts between the first wall surface 519 and the second wall surface 520. That is, the temperature sensing element 514 is not blocked by the first wall surface 519 and the second wall surface 520, which limits the mating structure between the temperature sensing element 514 and the first thermal pad 515, ensuring the path of heat transfer.

[0106] For example, such as Figure 13 As shown, the third opening 517 is located on the periphery of the temperature acquisition element 514. That is, the third opening 517 will not block the temperature acquisition element 514 and can limit the mating structure between the temperature acquisition element 514 and the first thermal pad 515.

[0107] like Figure 13 As shown, in some embodiments, along the second direction, the distance between at least one of the first wall surface 519 and the second wall surface 520 and the temperature acquisition element 514 gradually increases.

[0108] Among them, the mating structure of the first wall surface 519, the second wall surface 520 and the temperature acquisition element 514 is refined.

[0109] Along the second direction, the distance between at least one of the first wall surface 519 and the second wall surface 520 and the temperature sensing element 514 gradually increases. That is, along the second direction, the distance between the first wall surface 519 and the temperature sensing element 514 gradually increases, or the distance between the second wall surface 520 and the temperature sensing element 514 gradually increases, or the distance between both the first wall surface 519 and the second wall surface 520 and the temperature sensing element 514 gradually increases. For example, the temperature sensing element 514 has a teardrop-shaped structure to meet the usage requirement that the distance between at least one of the first wall surface 519 and the second wall surface 520 and the temperature sensing element 514 gradually increases along the second direction, so that there is a more stable contact surface between the temperature sensing element 514 and the first thermal pad 515. If the temperature sensor is arc-shaped or square, and is directly attached to a flat surface, gaps can easily form under long-term vibration and thermal expansion and contraction, leading to poor contact. A teardrop-shaped temperature sensor, however, can form a stable contact surface with the first thermal pad 515, allowing the temperature sensor 514 to make effective contact with it. Furthermore, the teardrop-shaped temperature sensor is easier to insert into the third opening 517, offering advantages in assembly and improving assembly smoothness and efficiency.

[0110] In some other embodiments, at least one of the first wall surface 519 and the second wall surface 520 is arranged at an angle to meet the usage requirement that the distance between at least one of the first wall surface 519 and the second wall surface 520 and the temperature acquisition element 514 gradually increases along the second direction.

[0111] like Figure 7 As shown, in some embodiments, a portion of the bracket 516 is a heat-conducting part 521, which is connected between the first heat-conducting pad 515 and the temperature acquisition element 514.

[0112] A portion of the bracket 516 is a heat-conducting part 521, which connects the first heat-conducting pad 515 and the temperature acquisition element 514. That is, the heat-conducting part 521 is located between the first heat-conducting pad 515 and the temperature acquisition element 514, and is connected to both the first heat-conducting pad 515 and the temperature acquisition element 514.

[0113] The heat-conducting part 521 serves to connect the first heat-conducting pad 515 and the temperature acquisition element 514, and also conducts heat. Heat can be conducted through the top cover 501 to the first heat-conducting pad 515, and then through the heat-conducting part 521 to the temperature acquisition element 514, further optimizing the heat conduction path and achieving the shortest and most direct heat transfer from the battery cell 50 to the temperature acquisition element 514. This reduces the obstruction to heat transfer between the first heat-conducting pad 515 and the temperature acquisition element 514, and can further improve the response speed and detection accuracy.

[0114] For example, the heat-conducting part 521 includes any one or a combination of the following: a metal part, a thermally conductive plastic part, a ceramic part, and a composite phase change material part.

[0115] In some embodiments, the connection structure between the bracket 516 and the partition plate 511 includes any one or a combination of the following: snap-fit ​​connection, screw connection, adhesive connection, and magnetic connection.

[0116] Specifically, the mating structure of the bracket 516 and the isolation plate 511 is refined. The bracket 516 and the isolation plate 511 are connected by snap-fit, and / or by screw, and / or by adhesive, and / or by magnetic attraction. That is, the bracket 516 and the isolation plate 511 are detachable, offering the advantage of easy assembly and disassembly, facilitating subsequent repair and maintenance.

[0117] like Figure 11 , Figure 12 and Figure 15 As shown, when the bracket 516 and the partition plate 511 are snapped together, one of the bracket 516 and the partition plate 511 includes a first snap-fit ​​portion 524, and the other includes a second snap-fit ​​portion 525, with a slot and a buckle engaging. When it is necessary to disassemble the bracket 516, the snap-fit ​​force between the bracket 516 and the partition plate 511 can be overcome by applying external force to the bracket 516. The first snap-fit ​​portion 524 is a slot, and the second snap-fit ​​portion 525 is a buckle.

[0118] When the bracket 516 and the isolation plate 511 are screwed together, one of the bracket 516 and the isolation plate 511 includes an internal thread, and the other includes an external thread. The internal and external threads are screwed together. When it is necessary to disassemble the bracket 516, the bracket 516 and the isolation plate 511 can be separated by rotating the bracket 516. Alternatively, when the bracket 516 and the isolation plate 511 are screwed together, both the bracket 516 and the isolation plate 511 include internal threads. The threaded fastener passes through the internal threads of the bracket 516 and the isolation plate 511. When it is necessary to disassemble the bracket 516, the bracket 516 and the isolation plate 511 can be separated by rotating the threaded fastener.

[0119] When the bracket 516 and the isolation plate 511 are bonded together, the bracket 516 and the isolation plate 511 are bonded together through the adhesive layer.

[0120] When the bracket 516 and the isolation plate 511 are magnetically connected, one of the bracket 516 and the isolation plate 511 is provided with a first magnetic part and the other is provided with a second magnetic part. The first magnetic part and the second magnetic part are magnetically attracted to each other. When it is necessary to disassemble the bracket 516, the magnetic attraction between the bracket 516 and the isolation plate 511 can be overcome by applying an external force to the bracket 516.

[0121] like Figure 6 , Figure 7 and Figure 14 As shown, in some embodiments, the acquisition structure 513 further includes a cover 522, which is detachably connected to the bracket 516. The cover 522 is located on the side of the temperature acquisition element 514 away from the first thermal pad 515. The cover 522 is used to press and fix the temperature acquisition element 514 along the direction from the insulating sheet 502 to the top cover 501.

[0122] The acquisition structure 513 also includes a cover 522, which is detachably connected to the bracket 516. The cover 522 is located on the side of the temperature acquisition element 514 away from the first thermal pad 515. When the cover 522 is connected to the bracket 516, the cover 522 can press and fix the temperature acquisition element 514 along the direction from the insulating sheet 502 to the top cover 501, reducing the distance between the temperature acquisition element 514 and the first thermal pad 515. For example, the cover 522, bracket 516, temperature acquisition element 514, and first thermal pad 515 cooperate to press and fix the temperature acquisition element 514 by interference fit, effectively limiting the fit dimensions of the top cover 501, the first thermal pad 515, and the temperature acquisition element 514, so that the temperature acquisition element 514 and the first thermal pad 515 are in close contact, which can reduce the contact thermal resistance and improve the detection accuracy of the temperature acquisition element 514.

[0123] In addition, the cover 522 is located on the side of the temperature acquisition element 514 away from the first thermal pad 515. The cover 522 can prevent moisture and dirt from the external environment from entering the temperature acquisition element 514, thereby improving the safety and reliability of the temperature acquisition element 514 and enhancing its performance.

[0124] For example, the connection structure between the bracket 516 and the cover 522 includes any one or a combination of the following: snap-fit ​​connection, screw connection, adhesive connection, and magnetic connection.

[0125] like Figure 14 As shown, in some embodiments, the acquisition structure 513 further includes a second thermal pad 523, which abuts between the cover 522 and the temperature acquisition element 514.

[0126] The acquisition structure 513 also includes a second thermal pad 523, which is located between the cover 522 and the temperature acquisition element 514. That is, the second thermal pad 523 abuts against the cover 522 and the temperature acquisition element 514.

[0127] Therefore, the temperature acquisition element 514 is located between the first thermal pad 515 and the second thermal pad 523. The first thermal pad 515 and the second thermal pad 523 cooperate to seal the temperature acquisition element 514, which can reduce heat loss and improve the response speed of the temperature acquisition element 514. The temperature acquisition element 514 can acquire temperature in real time, reduce response lag, improve the detection accuracy of the temperature acquisition element 514, and avoid the occurrence of thermal runaway of the battery device 5, which is conducive to improving the safety and reliability of the product.

[0128] like Figure 8 As shown, in some embodiments, the first battery cell 50a further includes an explosion-proof valve 504, a first terminal 505, and a second terminal 506, all of which expose an insulating sheet 502. Along the second direction, the explosion-proof valve 504 is located between the first terminal 505 and the second terminal 506, and a first opening 503 is located between the explosion-proof valve 504 and the first terminal 505, and the first opening 503 is closer to the explosion-proof valve 504 than the first terminal 505.

[0129] The first battery cell 50a also includes an explosion-proof valve 504, a first terminal 505, and a second terminal 506. The explosion-proof valve 504, the first terminal 505, and the second terminal 506 are located on the same side of the first battery cell 50a, and the explosion-proof valve 504, the first terminal 505, and the second terminal 506 all expose an insulating sheet 502.

[0130] Along the second direction, the explosion-proof valve 504 is located between the first pole 505 and the second pole 506, and the first opening 503 is located between the explosion-proof valve 504 and the first pole 505. That is, along the second direction, the first pole 505, the first opening 503, the explosion-proof valve 504, and the second pole 506 are arranged in sequence.

[0131] During charging and discharging, the first terminal 505 and the second terminal 506 are the main heat sources of the battery device 5. The first opening 503 is positioned between the explosion-proof valve 504 and the first terminal 505, and the first opening 503 is closer to the explosion-proof valve 504 than the first terminal 505. That is, the temperature acquisition element 514 is located between the explosion-proof valve 504 and the first terminal 505, and the temperature acquisition element 514 is closer to the explosion-proof valve 504 than the first terminal 505. This reduces the impact of the first terminal 505 and the second terminal 506 on the detection accuracy of the temperature acquisition element 514, ensuring that the detection data from the temperature acquisition element 514 accurately reflects the temperature of the battery cell 50.

[0132] In addition, when thermal runaway occurs, the areas near the first electrode 505 and the second electrode 506, as well as the area below the top cover 501, are the areas where the temperature and pressure rise the fastest and most violently. Placing the temperature acquisition device 514 between the first electrode 505 and the explosion-proof valve 504 can quickly capture the signal of thermal runaway, providing structural support for improving the safety and reliability of the battery device 5.

[0133] In some embodiments, the first opening 503 and the first pole post 505 are arranged at intervals along the second direction.

[0134] Specifically, by defining the positional relationship between the first opening 503 and the first pole 505, the positional relationship between the temperature acquisition element 514 and the first pole 505 is indirectly defined. That is, along the second direction, the first pole 505 and the temperature acquisition element 514 are arranged at intervals. By refining the positional relationship between the first opening 503 and the first pole 505, the distance between the first pole 505 and the temperature acquisition element 514 is further increased, so that the temperature acquisition element 514 is relatively far away from the area where the temperature and pressure rise most rapidly and drastically, thereby reducing the influence of the first pole 505 on the temperature acquisition element 514.

[0135] In some embodiments, along the second direction, the first pole 505 and the explosion-proof valve 504 are both arranged at intervals from the temperature acquisition element 514.

[0136] Among them, the cooperation structure of the first pole 505, the explosion-proof valve 504 and the temperature acquisition element 514 is refined.

[0137] Along the second direction, the first pole 505 and the temperature acquisition element 514 are arranged at intervals, and the explosion-proof valve 504 and the temperature acquisition element 514 are arranged at intervals. This allows the temperature acquisition element 514 to be relatively far away from the area where the temperature and pressure rise the fastest and most drastically. This reduces the impact of the first pole 505 and the explosion-proof valve 504 on the temperature acquisition element 514. While improving the detection accuracy of the temperature acquisition element 514, it also protects the temperature acquisition element 514 and helps to extend its service life.

[0138] Exemplarily, the battery device 5 includes a plurality of battery cells 50 and a collection assembly 51. Each battery cell 50 includes a top cover 501 and an insulating sheet 502, the insulating sheet 502 being stacked on one side of the top cover 501. The collection assembly 51 includes an isolation plate 511 and a collection structure 513, the collection structure 513 including a temperature sensing element 514, a first thermally conductive pad 515, and a bracket 516. The insulating sheet 502 has a first opening 503, and the isolation plate 511 has a second opening 512, the second opening 512 being opposite to the first opening 503. The bracket 516 is inserted into the second opening 512, and the bracket 516 and the isolation plate 511 are snapped together. The first thermally conductive pad 515 is adhered to the underside of the bracket 516. The temperature acquisition element 514 is placed on the bracket 516, and the cover 522 is placed on top. A second thermal pad 523 is attached to the bottom of the cover 522. The cover 522 and the bracket 516 are fitted together to press and fix the temperature acquisition element 514 by interference fit, so that the temperature acquisition element 514 is in close contact with the first thermal pad 515, which can reduce the contact thermal resistance and improve the detection accuracy of the temperature acquisition element 514.

[0139] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0140] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized by, The battery device comprises: a plurality of battery cells, each of the battery cells comprising a top cover and an insulation sheet stacked on one side of the top cover, and at least a first battery cell of the plurality of battery cells having a first opening provided on the insulation sheet thereof; a collecting assembly, the plurality of battery cells being located on the same side of the collecting assembly, the collecting assembly comprising: a separation plate, the insulation sheet being located between the separation plate and the top cover, the separation plate having a second opening provided opposite to the first opening; a collecting structure provided at the second opening, the collecting structure comprising a temperature collecting member and a first heat-conductive pad, the first heat-conductive pad being in abutment with the top cover through the first opening.

2. The battery device according to claim 1, characterized by The collecting structure further comprises: a support connected to the separation plate, the temperature collecting member and the first heat-conductive pad being provided on the support, the first heat-conductive pad being located between the temperature collecting member and the top cover.

3. The battery device of claim 2, wherein The support has a third opening, the first heat-conductive pad being provided on a side of the support facing the top cover, the temperature collecting member being located at the third opening and in abutment with the first heat-conductive pad.

4. The battery device of claim 3, wherein The collecting structure further comprises a heat-conductive adhesive layer, the temperature collecting member being connected to the first heat-conductive pad through the heat-conductive adhesive layer.

5. The battery device of claim 3, wherein The third opening has opposite first and second wall surfaces in a first direction, the temperature collecting member being located between the first and second wall surfaces.

6. The battery device of claim 5, wherein In a second direction, at least one of the first and second wall surfaces is gradually spaced apart from the temperature collecting member.

7. The battery device of claim 2, wherein A portion of the support is a heat-conductive portion connected between the first heat-conductive pad and the temperature collecting member.

8. The battery device according to any one of claims 2 to 7, characterized by, The connecting structure of the support and the separation plate comprises any one or a combination of the following: a clamping connection, a screw connection, an adhesive connection and a magnetic attraction connection.

9. The battery device according to any one of claims 2 to 7, characterized by, The collecting structure further comprises: a cover detachably connected to the support, the cover being located on a side of the temperature collecting member away from the first heat-conductive pad, the cover being used to press and fix the temperature collecting member in a direction from the insulation sheet to the top cover.

10. The battery device of claim 9, wherein, The collecting structure further comprises: a second heat-conductive pad in abutment between the cover and the temperature collecting member.

11. The battery device according to any one of claims 1 to 7, wherein The first battery cell further comprises an explosion-proof valve, a first pole and a second pole, the explosion-proof valve, the first pole and the second pole being exposed to the insulation sheet. In a second direction, the explosion-proof valve is located between the first pole and the second pole, the first opening is located between the explosion-proof valve and the first pole, and the first opening is closer to the explosion-proof valve than the first pole.

12. The battery device of claim 11, wherein, In the second direction, the first opening is spaced apart from the first pole.

13. An energy storage device, characterized by, The battery device comprises: any one of claims 1-12.

14. A charging network characterized in that, The energy storage device comprises:

15. An energy storage system characterized by, any one of claims 13. The energy storage device comprises: any one of claims 13.

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