Cover plate structure, battery cell, battery and electrical device

Abstract

The present application relates to the technical field of batteries. Provided in the embodiments of the present application are a cover plate structure, a battery cell, a battery and an electrical device. The cover plate structure comprises a cover plate, a connecting member and a measurement member; the cover plate is used for covering a housing of a battery cell, and the cover plate is provided with a communication hole, the communication hole being in communication with an inner cavity of the housing; the connecting member is connected to the cover plate and is suitable for forming a chamber, the chamber being in communication with the communication hole; and the measurement member is used for measuring gas parameters in the chamber. The cover plate structure, the battery cell, the battery and the electrical device provided in the embodiments of the present application can reduce damage to the cover plate structure, and prolong the service life of the cover plate structure.

Description

Cover structure, battery cells, batteries and electrical equipment

[0001] [Priority Information and Cross-Referencing]

[0002] This application claims priority to Chinese Patent Application No. 202411554335.8, filed on October 31, 2024, entitled “Cover Structure, Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a cover plate structure, a battery cell, a battery, and an electrical device. Background Technology

[0004] A battery is a device that converts chemical energy into electrical energy and is widely used in new energy vehicles, energy storage power stations, and other fields. A battery typically consists of multiple battery cells, each of which includes a casing, electrode components, and a cover. The electrode components are housed inside the casing, and the cover is connected to the casing and seals the outside. When a battery cell is in operation, it generates a large amount of gas, and the accumulation of this gas inside the casing causes changes in gas pressure.

[0005] In related technologies, a detection element is typically installed on the cover plate to detect pressure changes inside the housing. However, the detection element can easily damage the cover plate, reducing its service life. Summary of the Invention

[0006] In view of the above problems, embodiments of this application provide a cover plate structure, a battery cell, a battery, and an electrical device, which can reduce damage to the cover plate structure and improve the service life of the cover plate structure.

[0007] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0008] A first aspect of this application provides a cover plate structure, which includes:

[0009] A cover plate for sealing the housing of a battery cell; the cover plate has a connecting hole that communicates with the inner cavity of the housing;

[0010] A connector, which is attached to the cover plate and adapted to form a chamber; the chamber communicates with the communicating hole;

[0011] A detection element, used to detect gas parameters within the chamber.

[0012] In one possible implementation, the connector and the cover plate enclose the cavity.

[0013] In one possible implementation, the connector has a through cavity that extends through the connector along the thickness direction of the cover plate and is adapted to form the chamber.

[0014] In one possible implementation, the detection element is disposed on the connector and covers the chamber.

[0015] In one possible implementation, the connector includes a recessed area recessed toward the cover plate, the recessed area exposing at least a portion of the chamber;

[0016] The detection element is disposed within the recessed area.

[0017] In one possible implementation, the cover structure further includes a barrier element disposed on the connector and sealing the chamber;

[0018] The detection element is disposed on the barrier element and located on the side of the barrier element opposite to the connector.

[0019] In one possible implementation, the barrier covers the top surface of the connector and seals the chamber;

[0020] Alternatively, the barrier may cover the sides and part of the top surface.

[0021] In one possible implementation, the barrier includes a first barrier and a second barrier, wherein the materials of the first barrier and the second barrier are different.

[0022] The first barrier is connected to the end of the connector that faces away from the cover plate; the second barrier is disposed on the first barrier;

[0023] The detection element is disposed on the second barrier element.

[0024] In one possible implementation, the first barrier is a polyimide film and the second barrier is an aluminum-plastic film.

[0025] In one possible implementation, the cover structure further includes a circuit board disposed on the cover.

[0026] The circuit board is connected to the detection device and is used to process the detection signal of the detection device.

[0027] In one possible implementation, the circuit board is also covered over the detection element.

[0028] In one possible implementation, the circuit board is connected to the cover plate via a connector.

[0029] In one possible implementation, the connector includes a first fastener and a second fastener. The first fastener includes a connecting post and a screw. The connecting post is disposed on the cover plate and has a threaded hole. One end of the screw passes through the circuit board and is screwed into the threaded hole. One end of the second fastener is connected to the cover plate, and the other end is engaged with the circuit board.

[0030] In one possible implementation, the circuit board is also sealed to the connector via a seal.

[0031] In one possible implementation, the seal includes a sealing frame and a sealing ring, the sealing ring being disposed on the barrier and the sealing frame being disposed on the sealing ring;

[0032] The sealing frame, the sealing ring, the connector, and the circuit board form a mounting cavity, which is used to accommodate the detection component.

[0033] In one possible implementation, the seal includes a sealing ring.

[0034] In one possible implementation, the detection element includes a pressure sensor or a gas sensor.

[0035] A second aspect of this application provides a battery cell, including a housing and the cover structure described in the first aspect; the cover structure is disposed at an opening in the housing and covers the opening.

[0036] In one possible implementation, the housing further includes a hollow flange disposed on the housing and surrounding the opening;

[0037] The cover plate structure is located within the area enclosed by the flange.

[0038] A third aspect of this application provides a battery, including a housing and a plurality of battery cells as described in the second aspect, wherein the plurality of battery cells are disposed within the housing.

[0039] A fourth aspect of this application provides an electrical device, including an electrical device and a battery as described in the third aspect, wherein the battery is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0040] In the cover plate structure, battery cell, battery, and electrical device provided in this application embodiment, a connecting hole is formed in the cover plate, and a connector is provided on the cover plate. The connector is configured to form a chamber, and this chamber communicates with the connecting hole to ensure that gas generated by the battery cell during operation can enter the chamber through the connecting hole. A detection element is used to detect gas parameters located in the chamber. This avoids directly carving a groove in the cover plate to accommodate the detection element, and the smaller size of the connecting hole helps reduce damage to the cover plate, reduces the risk of structural weakening, and improves the service life of the cover plate structure.

[0041] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the cover plate structure, battery cell, battery, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 is a schematic diagram of the cover plate structure provided in an embodiment of this application;

[0044] Figure 2 is an enlarged schematic diagram of region A in Figure 1;

[0045] Figure 3 is a cross-sectional view of the cover plate structure provided in an embodiment of this application;

[0046] Figure 4 is an enlarged schematic diagram of region B in Figure 3;

[0047] Figure 5 is a second cross-sectional view of the cover plate structure provided in an embodiment of this application;

[0048] Figure 6 is an enlarged schematic diagram of region C in Figure 5;

[0049] Figure 7 is a schematic diagram of a single battery cell provided in an embodiment of this application;

[0050] Figure 8 is a schematic diagram of a single battery cell provided in an embodiment of this application;

[0051] Figure 9 is a schematic diagram of a single battery cell provided in an embodiment of this application;

[0052] Figure 10 is a schematic diagram of a single battery cell provided in an embodiment of this application;

[0053] Figure 11 is an enlarged schematic diagram of region D in Figure 10;

[0054] Figure 12 is a cross-sectional view of the battery provided in an embodiment of this application;

[0055] Figure 13 is a second cross-sectional view of the battery provided in an embodiment of this application.

[0056] Explanation of reference numerals in the attached drawings: 1000: Battery cell; 100: Cover structure; 110: Cover; 111: Connecting hole; 120: Connector; 121: Recessed area; 130: Chamber; 140: Detection element; 150: Barrier element; 151: First barrier element; 152: Second barrier element; 170: Circuit board; 180: Fastener; 181: First fastener; 182: Second fastener; 190: Seal; 191: Sealing frame; 192: Sealing ring; 200: Housing; 210: Flange. Detailed Implementation

[0057] As described in the background section, the cover plates in the related technologies have a short service life. The inventors have found that the reason for this problem is that there are currently limited methods for detecting the internal pressure and gas composition of batteries. Moreover, most of these methods require large external devices or may damage the battery's own structure, and cannot effectively monitor the evolution of the internal pressure and gas composition of the battery cell during operation in real time.

[0058] In related technologies, a receiving groove is typically carved into the side of the cover plate facing the outer shell, and a detection element is placed in the receiving groove to detect pressure changes inside the outer shell. However, the detection element is prone to damaging the cover plate, reducing its service life.

[0059] To address the aforementioned technical problems, embodiments of this application provide a cover plate structure, a battery cell, a battery, and an electrical device, in which a connecting hole for connecting the inner cavity of the battery cell is formed in the cover plate, and a connector is provided on the cover plate; wherein, the connector is configured to form a chamber, and this chamber communicates with the connecting hole, so as to ensure that the gas generated by the battery cell during operation can enter the chamber through the connecting hole. A detection element is used to detect the gas parameters located in the chamber. In this way, it is possible to avoid directly carving a groove in the cover plate for accommodating the detection element, and the size of the connecting hole is small, which helps to reduce damage to the cover plate, reduces the risk caused by structural weakening, and improves the service life of the cover plate structure.

[0060] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0061] Please refer to Figures 1 to 6. This application provides a cover structure 100, which is applied to a battery cell 1000 to seal the casing 200 of the battery cell 1000 (please refer to Figures 7 to 13). Exemplarily, the cover structure 100 includes a cover plate 110, which is fixedly connected to the casing 200 to seal the casing 200 of the battery cell 1000, preventing electrolyte leakage from the casing 200 and improving the safety of the battery cell 1000.

[0062] Please refer to Figures 2 to 6. The cover plate 110 includes a connecting hole 111, which extends through the cover plate 110 along its thickness direction, allowing it to communicate with the inner cavity of the housing 200. It is important to understand that, while ensuring smooth gas flow within the housing 200, the diameter of the connecting hole 111 is kept as small as possible to avoid excessively reducing the structural strength of the cover plate 110 and to extend its service life. The thickness direction of the cover plate 110 can be the Z-direction shown in Figure 3.

[0063] The cover structure 100 also includes a connector 120, which is connected to the cover 110. For example, the connector 120 is disposed on the side of the cover 110 away from the housing 200 and is fixedly connected to the cover 110. The connector 120 can be made of metal, such as copper, aluminum, and nickel.

[0064] In one example, the connector 120 can be fixedly connected to the cover plate 110 by welding, for example, by brazing or laser welding. This ensures a strong connection between the connector 120 and the cover plate 110, thereby improving the reliability and stability of the cover plate structure 100. Furthermore, the welded connection also achieves a good sealing effect, preventing gas leakage and improving the safety of the battery cell 1000 using this cover plate structure 100.

[0065] The connector 120 is adapted to form a chamber 130, which is connected to the connecting hole 111. In this way, the gas flowing through the connecting hole 111 can be contained within the chamber 130, preventing the gas from diffusing outside the chamber 130 and improving the safety of the battery cell 1000.

[0066] The cover structure 100 also includes a detection element 140, which is used to detect gas parameters within the chamber 130. In this embodiment, the gas parameters may include gas pressure or gas composition. In one example, the detection element 140 is a pressure sensor, which promptly and effectively detects the pressure within the chamber 130, preventing excessive gas accumulation within the housing 200 and improving the safety of the battery cell 1000. In another example, the detection element 140 is a gas sensor, which can promptly detect the gas composition within the housing 200, effectively reflecting whether the battery assembly of the battery cell 1000 has leaked, thus ensuring the safety of the battery cell. The gas sensor can detect one of carbon dioxide, methane, or hydrogen.

[0067] In this example, the length of the detection piece 140 is 4mm to 10mm, the width is 3mm to 9mm, and the height is 0.3mm to 4mm.

[0068] In this embodiment, a connecting hole 111 for connecting the inner cavity of the battery cell 1000 is formed in the cover plate 110, and a connector 120 is provided on the cover plate 110. The connector 120 is configured to form a chamber 130, which communicates with the connecting hole 111, ensuring that gas generated by the battery cell 1000 during operation can enter the chamber 130 through the connecting hole 111. This avoids directly excavating a groove for accommodating the detection component 140 in the cover plate 110, and the smaller size of the connecting hole 111 helps reduce damage to the cover plate 110, reduces the risk of structural weakening, and improves the service life of the cover plate structure.

[0069] In addition, in this embodiment, the detection element 140 can monitor the evolution of gas pressure / gas composition in the cavity of the battery cell in real time. Compared with the monitoring of external gas pressure / gas sensors at the pack or module level, it can detect and identify the evolution of gas pressure / gas composition in the cavity of the battery cell earlier. If a battery cell is in danger, it can identify the danger signal earlier, issue an early warning signal, and provide a safety warning, thereby extending the time for response and handling of danger.

[0070] It should be understood that the connector 120 is suitable for forming the chamber 130. This can be understood as the connector 120 directly forming the chamber 130, or the connector 120 and other components jointly enclosing and forming the chamber 130.

[0071] In some possible examples, the connector 120 and the cover plate 110 enclose the chamber 130. Referring again to Figures 3 and 4, the connector 120 and the cover plate 110 enclose the chamber 130. Alternatively, the connector 120 is a hollow annular component, disposed on the cover plate 110 and fitted over the communicating hole 111. In this way, the connector 120 and the cover plate 110 together enclose the chamber 130.

[0072] In this embodiment, the connector 120 and the cover plate 110 form a chamber 130; the gas generated during battery operation flows into the chamber 130 through the connecting hole 111; the chamber 130 can reserve and buffer the gas, thereby reducing the impact of the gas, making it easier for the detection device 140 to detect the gas parameters in the chamber 130 more stably. This stability helps to improve the detection accuracy, thereby enabling the battery management system to more accurately determine the working status of the battery cells.

[0073] In other possible examples, the chamber 130 may be formed by a groove carved into the connector 120, or by other structures. Exemplarily, the connector 120 includes a through cavity extending through it along the thickness direction of the cover plate 110, thus forming the chamber 130. This arrangement allows the chamber 130 to be integrated with the connector 120, reducing additional components and connection points, making the cover plate structure 100 more compact and simpler. Furthermore, the detection element 140 can quickly come into contact with the gas, thereby enabling real-time and efficient detection of gas parameters. In this embodiment, the thickness of the connector 120 is 1 mm to 3 mm.

[0074] In this embodiment, the detection element 140 is used to detect gas parameters within the chamber 130. The detection element 140 can be directly connected to the connector 120 or indirectly connected to other components.

[0075] In one possible implementation, the detection element 140 is disposed on the connector 120 and covers the chamber 130. Referring to Figures 3 to 6, the top surface of the chamber 130 is the bottom surface of the detection element 140, allowing the gas inside the chamber 130 to directly contact the detection element 140. This improves the detection accuracy and response speed of the detection element 140, and also provides greater flexibility in selecting the type of detection element 140. Different types of sensors can be selected based on specific needs. For example, a pressure sensor can be selected when air pressure needs to be detected; a gas sensor can be selected when gas composition needs to be detected. This flexibility allows the design to adapt to various application scenarios and meet different detection requirements.

[0076] It should be understood that the connection relationship and connection position between the detection element 140 and the connector 120 can be freely set according to the structure of the connector 120. In one example, please refer to Figures 3 and 4. When the connector 120 is a hollow annular part, the detection element 140 can be placed on the connector 120 and cover the chamber 130.

[0077] In another example, referring to Figures 5 and 6, the connector 120 includes a recessed area 121 recessed towards the cover plate 110, the recessed area 121 exposing at least a portion of the chamber 130; the detection element 140 is disposed within the recessed area 121. On the one hand, the connector 120 can be used to protect the detection element 140, reducing the risk of the detection element 140 being exposed to the outside, effectively protecting the detection element 140 from external physical damage and environmental influences, thereby extending the service life of the detection element 140. On the other hand, the design of the recessed area 121 allows the detection element 140 to be compactly installed on the connector 120, optimizing space utilization. This compact structural design not only saves space in the overall device but also makes the cover plate structure more compact and portable, suitable for space-constrained applications.

[0078] In this embodiment of the application, the detection element 140 is sealed on the cavity 130, which can be understood as: the detection element 140 can be directly sealed on the through cavity, or indirectly sealed on the through cavity through other components.

[0079] In one possible implementation, referring to Figures 3 and 4, the cover structure 100 further includes a barrier 150 disposed on the connector 120 and sealing the chamber 130. A detection element 140 is disposed on the barrier 150 and located on the side of the barrier 150 opposite to the connector 120. Thus, the barrier 150 and the detection element 140 together seal the chamber 130.

[0080] The area of ​​the orthographic projection of the barrier 150 on the cover plate 110 is equal to the area of ​​the orthographic projection of the chamber 130 on the cover plate 110, or the area of ​​the orthographic projection of the barrier 150 on the cover plate 110 is greater than the area of ​​the orthographic projection of the chamber 130 on the cover plate 110.

[0081] For example, the edge of the barrier 150 protrudes from the connector 120. For instance, the length of the barrier 150 is 6mm to 20mm and the width is 5mm to 15mm. This configuration can improve the barrier capability of the barrier 150, minimize the leakage of gas from the chamber 130, and improve the safety of the battery cell.

[0082] The detection element 140 is connected to the connector 120 via the barrier 150. It should be noted that when the detection element 140 is disposed on the barrier 150, the detection element 140 is a pressure sensor, which can be used to detect the pressure in the chamber 130, and then use this pressure to characterize the pressure inside the battery cell.

[0083] In this embodiment, the barrier 150 can, on the one hand, cover the connector 120 to form a closed chamber 130, which makes it easier for the detector 140 to better detect the gas pressure state inside the chamber 130; on the other hand, it can prevent the detector 140 from directly contacting the gas, thereby preventing the gas from corroding the detector 140 and extending the service life of the detector 140.

[0084] It should be understood that the connection method between the barrier 150 and the connector 120 can be freely set according to the shape of the connector 120. In one example, referring to Figures 3 and 4, the connector 120 is a hollow annular structure. In this case, the barrier 150 can be connected to the top surface of the connector 120 and seal the chamber 130.

[0085] In another example, referring to Figures 5 and 6, when the connector 120 includes the recessed area 121, the barrier 150 covers the sides and at least part of the top surface of the connector 120. When the barrier 150 covers the sides and part of the top surface of the connector 120, it does not completely obstruct the chamber 130. Thus, the detection element 140 can directly contact the gas inside the chamber 130. In this case, the detection element 140 functions as a pressure sensor, allowing it to detect the pressure in the chamber 130 and thus characterize the pressure within the battery cell. The detection element 140 can also function as a gas sensor, allowing it to detect the composition of the gas. When the barrier 150 covers the sides and the entire top surface of the connector 120, its barrier capability is improved, preventing gas leakage and enhancing the safety of the battery cell.

[0086] The barrier 150 can be an integral structure or a split structure. For example, the barrier 150 includes a first barrier 151 and a second barrier 152. The first barrier 151 is connected to the end of the connector 120 opposite to the cover plate 110.

[0087] The second barrier 152 is disposed on the first barrier 151, and the detection element 140 is disposed on the second barrier 152. In this way, the barrier capability of the barrier 150 can be guaranteed, and the mass of the barrier 150 can be reduced, thereby improving the energy density of the battery cell.

[0088] In this embodiment, both the first barrier 151 and the second barrier 152 can be barrier films, but the materials of the first barrier 151 and the second barrier 152 are different. For example, the first barrier 151 is a polyimide film, and the second barrier 152 is an aluminum-plastic film. In this way, the high sealing performance of the polyimide film can be fully utilized to prevent gas leakage from the chamber 130, thereby improving the safety of the battery cell. The aluminum-plastic film also provides better gas and moisture barrier capabilities and good corrosion resistance, reducing the corrosion of the gas detection element 140 and extending its service life. Therefore, this embodiment, by combining different materials, can achieve optimization of multiple functions, thereby optimizing the overall performance of the cover structure 100.

[0089] It should be noted that this embodiment also requires limiting the thickness of the barrier component 150. If the thickness of the barrier component 150 is too small, its barrier capability will be reduced, and it will be insufficient to withstand the gas impact within the chamber 130. If the thickness of the barrier component 150 is too large, it will increase the weight of the cover structure 100, thereby reducing the energy density of the battery cell. Therefore, in this embodiment, the thickness of the barrier component 150 is 50μm to 200μm, which can ensure the barrier capability of the barrier component 150 while avoiding excessive reduction in the energy density of the battery cell.

[0090] A waterproof and breathable membrane may also be provided on the surface of the barrier 150 facing the cover plate 110 to further prevent the barrier 150 from contacting the electrolyte, thereby avoiding the electrolyte from corroding the detection element 140 and extending the service life of the detection element 140.

[0091] In one possible implementation, the cover structure 100 further includes a circuit board 170 disposed on the cover 110. The circuit board 170 has a length of 10mm to 30mm, a width of 8mm to 22mm, and a thickness of 1mm to 15mm.

[0092] Circuit board 170 covers and connects to detection element 140. Circuit board 170 is used to process the detection signals from detection element 140. In one example, circuit board 170 integrates a signal receiving module, a signal processing module, a data storage module, and a communication module, which can be used to connect to a battery management system (BMS).

[0093] In one embodiment, the signal receiving module transmits the detection signal from the detection element 140 to the signal processing module. The signal processing module processes the detection signal, for example, determining whether the air pressure inside chamber 130 is normal. The processing result of the signal processing module can also be transmitted to the battery management system (BMS) via the communication module, so that the BMS can issue corresponding instructions. In another example, the circuit board 170 integrates a signal receiving module and a communication module. The signal receiving module receives the detection signal from the detection element 140 and transmits it to the battery management system (BMS) via the communication module. The BMS processes the detection signal, for example, determining whether the air pressure inside chamber 130 is normal and issuing corresponding instructions.

[0094] It should be noted that the height of the components integrated on the circuit board 170 is less than the distance between the lower surface of the circuit board 170 and the upper surface of the cover plate 110, so as to prevent the components from contacting the cover plate 110 and thus avoid affecting the function of the components.

[0095] When using this cover structure 100 to monitor the gas pressure and gas composition of the battery cells, an external power source can be used to power the circuit board 170, or wires can be used to connect the circuit board 170 to the positive and negative terminals of the battery cells to enable the battery cells to operate on their own.

[0096] In one possible implementation, the circuit board 170 is connected to the cover plate 110 via fastener 180. This significantly improves the stability of the connection between the circuit board 170 and the cover plate 110.

[0097] It should be noted that the fastener 180 can be a bolt or a snap-fit. For example, the fastener 180 includes a first fastener 181 and a second fastener 182. The first fastener 181 includes a connecting post and a screw. The connecting post is disposed on the cover plate 110 and has a threaded hole. One end of the screw passes through the circuit board 170 and is screwed into the threaded hole. One end of the second fastener 182 is connected to the cover plate 110, and the other end is snapped into the circuit board 170.

[0098] In this embodiment, the circuit board 170 is connected to the cover plate 110 through the first fastener 181 and the second fastener 182. The dual fixing method not only enhances the stability of the circuit board 170, but also makes installation and maintenance easier. Users can install and remove the circuit board 170 by means of screws and snap-fit, reducing installation steps and maintenance difficulty, improving work efficiency and reducing maintenance costs.

[0099] The connecting post has a diameter of 3mm to 10mm, a height of 5mm to 30mm, and a threaded hole diameter of 2mm to 6mm. The connecting post is made of metal, such as copper or aluminum. The connecting post is rectangular or cubic in shape.

[0100] In this embodiment, the number of connecting posts can be one or more. For example, four connecting posts are arranged circumferentially around the connector 120. This arrangement maximizes the stability of the connection between the circuit board 170 and the cover plate 110.

[0101] As one possible implementation of the second fastener 182, the second fastener 182 is a snap-fit. The snap-fit ​​can be made of metal or non-metal; in one example, the snap-fit ​​is made of metal, for example, copper or aluminum. One end of the snap-fit ​​can be fixedly connected to the cover plate 110 by welding, and the other end of the snap-fit ​​is snapped into the circuit board 170. In another example, the snap-fit ​​is made of non-metal, for example, a polymer such as polypropylene or polyethylene; one end of the snap-fit ​​is fixedly connected to the cover plate 110 by adhesive, and the other end of the snap-fit ​​is snapped into the circuit board 170.

[0102] In one possible implementation, the circuit board 170 is sealed to the connector 120 via a seal 190. On one hand, this prevents external air, moisture, and dust from entering the chamber 130, ensuring a stable gas environment within the chamber 130 and facilitating accurate detection by the detection element 140. On the other hand, it effectively prevents gas leakage within the chamber 130, ensuring that gas within the chamber 130 does not leak out, thereby improving the safety and reliability of the battery cell.

[0103] Please refer to Figures 3 and 4. The seal 190 includes a sealing frame 191 and a sealing ring 192, with the sealing ring 192 disposed on the barrier 150. The sealing frame 191 is disposed on the sealing ring 192. The sealing frame 191, the sealing ring 192, the barrier 150, and the circuit board 170 form a mounting cavity for accommodating the detection element 140.

[0104] The sealing frame 191 is made of materials such as polyethylene and polypropylene, while the sealing ring 192 is made of rubber. The height of the sealing frame 191 is the distance between the lower surface of the circuit board 170 and the upper surface of the cover plate 110, minus the height of the connector 120 and the thickness of the sealing ring 192. When the four screws on the circuit board 170 are tightened, the circuit board 170 exerts a downward pressure, sealing the sealing frame 191 and the connector 120, thereby preventing the leakage of internal gas and electrolyte from the battery cell.

[0105] To further ensure sealing, a filler AB glue (AB glue stands for two-component silicone structural sealant) can be applied to the gap between the barrier 150 and the connector 120. It is a mixed system composed of component A (base polymer) and component B (crosslinking agent or curing agent), which reacts to form a tough silicone gel, thus achieving a sealing effect.

[0106] Please refer to Figures 5 and 6. The seal 190 includes a sealing ring located between the circuit board 170 and the connector 120, and is in close contact with the outer surface of the detection element 140.

[0107] It should be understood that when the seal 190 is a sealing ring and the connector 120 includes a recessed area 121, the height between the recessed area 121 and the cover plate 110 is equal to the distance between the lower surface of the circuit board 170 and the upper surface of the cover plate 110 minus the height of the detection element 140. The distance between the surface of the connector 120, excluding the recessed area 121, and the cover plate 110 is equal to the distance between the lower surface of the circuit board 170 and the upper surface of the cover plate 110 minus 0.9 times the height of the seal 190.

[0108] To further ensure a tight seal, AB glue can be applied to fill the gap between the seal and the connector 120.

[0109] Please continue to refer to Figures 1, 3 and 5. The cover plate 110 is also provided with a liquid injection hole, an explosion-proof valve and positive and negative terminals. The functions of the above components are all related technologies, and will not be described in detail here in this embodiment.

[0110] Please refer to Figures 9 to 13. This application also provides a battery cell 1000, which includes a housing 200 and a cover structure 100 as described in any of the above embodiments.

[0111] The housing 200 has an opening, and a cover structure 100 is disposed at the opening of the housing 200 and seals the opening. The housing 200 can be made of aluminum or copper.

[0112] Since the battery cell 1000 in this embodiment includes a cover structure 100, it has the structure and beneficial effects of the cover structure 100, and will not be described in detail here.

[0113] Referring to Figures 10 and 11, the housing 200 also includes a hollow flange 210, which is disposed on the housing 200 and surrounds the opening; the cover structure 100 is located within the area enclosed by the flange 210. This design provides more effective protection for components on the cover structure 100, for example, better protection for components on the circuit board 170, reducing the risk of impacts to components on the circuit board 170 and extending the service life of the circuit board 170.

[0114] The flange 210 can be integrally formed with the housing 200 or formed separately. In one example, the flange 210 and the housing 200 are formed by stamping, which has the advantages of simple manufacturing process and high structural strength. In another example, the flange 210 can be welded to the housing 200. In this way, the height and shape of the flange 210 can be flexibly designed according to the actual needs of the product, thereby meeting the requirements of different application scenarios, helping to optimize product performance and improve user experience.

[0115] Please refer to Figures 10 and 11. The top surface of flange 210 is flush with the top surface of circuit board 170, ensuring the protective function of flange 210 without excessively increasing the height of housing 200. This optimizes the overall dimensions of housing 200, making the equipment more compact and easier to install and use. Furthermore, keeping the height of housing 200 within a reasonable range helps reduce material costs and manufacturing difficulty, improving production efficiency and economic benefits.

[0116] This application also provides a battery, including a casing (not shown in the figure) and a plurality of battery cells 1000 as described in any of the above embodiments. The plurality of battery cells 1000 are disposed within the casing.

[0117] The battery provided in this embodiment may include square batteries, long-blade batteries, short-blade batteries, and square-blade batteries, etc. Since the battery includes the battery cell described in any of the above embodiments, it possesses the structure and beneficial effects of a battery cell, and will not be described in detail here.

[0118] This application also provides an electrical device, including an electrical device (not shown in the figure) and a battery as described in any of the above embodiments. The battery is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0119] The electrical equipment in this application embodiment can be a vehicle, for example, a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Accordingly, the electrical device can be the vehicle's drive mechanism or the vehicle's control system.

[0120] In addition, electrical equipment can also serve as other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Among these, spacecraft can include airplanes, rockets, space shuttles, or spacecraft.

[0121] Since the electrical device in this embodiment includes the battery described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery will not be described in detail here.

[0122] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0123] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A cover plate structure (100), wherein, include: A cover plate (110) is used to cover the housing (200) of a battery cell; the cover plate (110) has a connecting hole (111) that communicates with the inner cavity of the housing (200); A connector (120) is connected to the cover plate (110) and adapted to form a chamber (130); the chamber (130) communicates with the connecting hole (111); The detection element (140) is used to detect gas parameters in the chamber (130).

2. The cover plate structure (100) according to claim 1, wherein, The connector (120) and the cover plate (110) enclose the chamber (130).

3. The cover plate structure (100) according to claim 1 or 2, wherein, The connector (120) has a through cavity that extends through the connector (120) along the thickness direction of the cover plate (110) and is adapted to form the chamber (130).

4. The cover plate structure (100) according to any one of claims 1-3, wherein, The detection element (140) is disposed on the connector (120) and covers the chamber (130).

5. The cover plate structure (100) according to any one of claims 1-4, wherein, The connector (120) includes a recessed area (121) recessed toward the cover plate (110), the recessed area (121) exposing at least a portion of the chamber (130); The detection element (140) is disposed within the recessed area (121).

6. The cover plate structure (100) according to any one of claims 1-5, wherein, The cover structure (100) further includes a barrier (150), which is disposed on the connector (120) and seals the chamber (130); The detection element (140) is disposed on the barrier element (150) and located on the side of the barrier element (150) opposite to the connector (120).

7. The cover plate structure (100) according to claim 6, wherein, The barrier (150) covers the top surface of the connector (120) and seals the chamber (130); Alternatively, the side surface and at least part of the top surface of the barrier (150).

8. The cover plate structure (100) according to claim 6, wherein, The barrier (150) includes a first barrier (151) and a second barrier (152), wherein the materials of the first barrier (151) and the second barrier (152) are different. The first barrier (151) is connected to the end of the connector (120) away from the cover plate (110); the second barrier (152) is disposed on the first barrier (151); The detection element (140) is disposed on the second barrier element (152).

9. The cover plate structure (100) according to claim 8, wherein, The first barrier (151) is a polyimide film, and the second barrier (152) is an aluminum-plastic film.

10. The cover plate structure (100) according to any one of claims 1-9, wherein, The cover plate structure (100) also includes a circuit board (170), which is disposed on the cover plate (110); The circuit board (170) is connected to the detection element (140) and is used to process the detection signal of the detection element (140).

11. The cover plate structure (100) according to claim 10, wherein, The circuit board (170) is also covered by the detection element (140).

12. The cover plate structure (100) according to claim 10 or 11, wherein, The circuit board (170) is connected to the cover plate (110) by fasteners (180).

13. The cover plate structure (100) according to claim 12, wherein, The fastener (180) includes a first fastener (181) and / or a second fastener (182). The first fastener (181) includes a connecting post and a screw. The connecting post is disposed on the cover plate (110) and has a threaded hole. One end of the screw passes through the circuit board (170) and is screwed into the threaded hole. One end of the second fastener (182) is connected to the cover plate (110) and the other end is snapped into the circuit board (170).

14. The cover plate structure (100) according to claim 10 or 11, wherein, The circuit board (170) is also sealed to the connector (120) by a seal (190).

15. The cover plate structure (100) according to claim 14, wherein, The sealing element (190) includes a sealing frame (191) and a sealing ring (192), the sealing ring (192) is disposed on the barrier element (150), and the sealing frame (191) is disposed on the sealing ring (192); The sealing frame (191), the sealing ring (192), the connector (120), and the circuit board (170) form a mounting cavity for accommodating the detection component (140).

16. The cover plate structure (100) according to claim 14, wherein, The seal (190) includes a sealing ring.

17. The cover plate structure (100) according to any one of claims 1-16, wherein, The detection element (140) includes a pressure sensor or a gas sensor.

18. A single battery cell (1000), wherein, Includes a housing (200) and a cover structure (100) as described in any one of claims 1-17; The cover structure (100) is disposed at the opening of the housing (200) and covers the opening.

19. The battery cell (1000) according to claim 18, wherein, The housing (200) further includes a hollow flange (210), which is disposed on the housing (200) and surrounds the opening; The cover plate structure (100) is located within the area enclosed by the flange (210).

20. A battery, wherein, It includes a housing and a plurality of battery cells (1000) as described in claim 18 or 19, wherein the plurality of battery cells (1000) are disposed within the housing.

21. An electrical appliance, wherein, It includes an electrical device and the battery of claim 20, wherein the battery is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

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