Battery cell cover assembly, battery cell and battery

Abstract

Battery cell cover assembly, characterized in that it comprises: a cover plate which is provided with a mounting section, wherein the mounting section is designed as a recessed structure; a reinforcement block that is installed on the assembly section.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of batteries, in particular a battery cell lid assembly, a battery cell and a battery. STATE OF THE ART

[0002] Currently, a square hard-shell structure is most commonly used for the battery cells of traction batteries. The battery cell shell of this structure consists of a casing and a lid assembly, which are tightly joined to seal and insulate the electrochemical components inside the shell from the external environment.

[0003] The cover assembly typically comprises a cover plate, positive and negative output terminals, and an explosion relief valve for pressure venting, all mounted on the cover plate. The positive and negative output terminals are tightly connected to the cover plate and serve to conduct the electrical energy from the electrode assembly out of the enclosed space. The explosion relief valve opens when the internal pressure of the battery cell reaches a certain value to release gases from inside the cell, preventing explosions and allowing the controlled venting of harmful gases. After the positive and negative output terminals are connected to the corresponding positive and negative terminal tabs inside, the cover plate is welded to the periphery of the housing, thus completing the assembly and sealing of the casing.

[0004] In current square battery cells, gas formation inside the cell leads to outward deformation of the end plate. The deformation around the perimeter of the end plate is minimal due to the confines of the casing. The further the deformation is from the casing (closer to the center of the end plate), the greater the deformation. This deformation of the end plate leads to the following problems: 1. The seal between the end plate and the positive and negative terminals deteriorates, which can easily result in gas escaping from inside the casing; 2.Since the deformation of the cover plate dissipates some of the pressure, the opening pressure of the explosion protection valve increases, thus delaying the opening of the explosion protection valve; when the valve opens, the pressure inside the battery cell exceeds the standard pressure, which can easily lead to an explosion and increases the hazard of the battery cell.

[0005] Therefore, there is an urgent need for a battery cell structure that reduces the deformation of the cover plate in order to improve the reliability and safety of the battery cell. CONTENT OF THE PRESENT APPLICATION

[0006] The present application provides a battery cell lid assembly, a battery cell and a battery to solve the problem of slight deformation of the lid plate of an existing battery cell and to improve the reliability and safety in the use of the battery cell.

[0007] In the first aspect, the present application provides a battery cell cover assembly comprising a cover plate and a reinforcement block, wherein the cover plate is provided with a mounting section designed as a recessed structure; and wherein the reinforcement block is installed on the mounting section.

[0008] Therefore, the main body of the cover assembly provided by the first aspect of the present application consists of a combination of the cover plate and the reinforcing blocks by attaching reinforcing blocks to the cover plate.In contrast to a single cover plate, with the combined cover assembly, when one side is subjected to a pressure surge, both the cover plate and the reinforcement block must be deformed simultaneously, and the relative force occurring between the cover plate and the reinforcement block must be overcome to produce deformation; this increases the deformation resistance of the cover plate, so that in the event of thermal runaway, the probability of leakage between the positive and negative output terminals and the cover plate, as well as delayed opening of the explosion protection valve due to deformation of the cover plate by the pressure inside the battery cell, is reduced, thus increasing the reliability and safety in the use of the battery cell.

[0009] In one possible design, the cover plate has a horizontal center line that bisects the inner or outer side surface of the cover plate along the width direction of the cover plate; the assembly section being located at least partially on the horizontal center line.

[0010] With the solution described above, the horizontal centerline of the cover plate is its center in the width direction, and the area where this centerline is located encompasses the part of the cover plate most susceptible to deformation. The mounting section lies at least partially on this horizontal centerline. When the reinforcing block is located within the mounting section, it strengthens the area of ​​the cover plate most prone to deformation, thus reducing deformation and improving the overall deformation resistance of the cover plate.

[0011] In one possible design, the dimension M of the reinforcement block and the dimension N of the mounting section satisfy the following condition in every direction except the thickness of the reinforcement block: M ≤ N + 0.2 mm.

[0012] The solution described above limits the dimensions of the reinforcement block in any direction to a range 0.2 mm larger than the mounting section, so that the reinforcement block can be installed relatively easily in the mounting section and no problems arise during installation.

[0013] In one possible design, the thickness of the reinforcement block is less than or equal to the depth of the mounting section.

[0014] With the solution described above, the reinforcement block does not protrude beyond the surface of the cover plate after installation in the assembly section, so no additional space is required, reducing the volume of the cover assembly.

[0015] In one possible design, the material strength of the reinforcement block is greater than or equal to the material strength of the cover plate.

[0016] Due to the solution described above, the reinforcement block itself has high strength, so that adding the reinforcement block does not reduce the local strength of the cover plate, nor does it further reduce the local strength of the cover assembly, thus making deformation of the cover plate more difficult.

[0017] In one possible design, the number of assembly sections is one or more, and accordingly the number of reinforcement blocks is one or more.

[0018] The solution described above allows one or more assembly sections to be arranged according to the distribution of the other parts on the cover plate, making the position and number of reinforcement blocks more flexible, thus facilitating a sensible arrangement of the number and position of the reinforcement blocks without affecting the original structural features of the cover assembly, in order to increase the strength of the cover assembly.

[0019] In one possible design, the mounting section can be located on the inside of the cover plate or on the outside of the cover plate, with the inside being the side closer to the inside of the battery cell shell and the outside being the side closer to the outside of the battery cell shell.

[0020] The solution described above allows the reinforcement block to be positioned on either the inside or outside of the cover plate, thus increasing flexibility in its placement. Regardless of whether the reinforcement block is located on the inside or outside of the cover plate, it can increase the cover plate's strength to a certain extent, reduce or even eliminate deformation, and thereby improve the reliability and safety of the battery cell.

[0021] In one possible design, the reinforcement block is attached to the mounting section of the cover plate by welding, screwing or riveting.

[0022] The solution described above allows the reinforcement block and the cover plate to be connected in one of the simple ways mentioned above, thus reducing the difficulty of assembling the reinforcement block and the cover plate.

[0023] In the second aspect, the present application comprises a battery cell comprising a housing, an electrode assembly and a cover assembly according to one of the embodiments, wherein the cover assembly is tightly connected to the circumference of the opening of the housing and the electrode assembly is arranged in the space enclosed by the cover assembly and the housing.

[0024] The solution described above prevents chemical substances from easily escaping from the cover assembly when using the battery cell with the cover assembly in one of the above-mentioned embodiments, and in the event of thermal runaway, the probability of a delayed opening of the explosion protection valve is low, thereby increasing the reliability and safety of the battery cell.

[0025] In the third aspect, the present application further provides a battery, comprising a battery cell in the above embodiments.

[0026] The advantageous effects of the battery cells and batteries provided in the second and third aspects, as well as in the possible embodiments of the second and third aspects, can be derived from the advantageous effects of the cover assemblies provided in the first aspect and the possible embodiments of the first aspect and are not described again here. BRIEF DESCRIPTION OF THE DRAWING Fig. Figure 1 shows a schematic diagram of an exploded structure of a cover assembly provided by an embodiment of the present application; Fig. Figure 2 shows a sectional view of a lid assembly in its exploded state; Fig. Figure 3 shows an enlarged view of location A according to Fig. 2; Fig. Figure 4 shows a schematic diagram of an exploded structure of a battery cell provided by an embodiment of the present application; Fig. Figure 5 shows a schematic diagram of an exploded structure of another cover assembly provided by an embodiment of the present application; Fig. Figure 6 shows a schematic diagram of an exploded structure of another cover assembly provided by an embodiment of the present application. Reference symbol list 100 Cover assembly 110 Cover plate 111 Assembly section 120 Reinforcement block 130 Horizontal center line 200 cases 300 electrode assembly DETAILED DESCRIPTION

[0027] To clarify the objectives, technical solutions, and advantages of the present application, the technical solutions of the present application are described clearly and completely below with reference to the accompanying drawings. It is understood that the described embodiments represent only a portion of the embodiments of the present application and do not encompass all embodiments. All other embodiments that a person skilled in the art in this field obtains without creative effort based on the embodiments of the present application also fall within the scope of protection of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as they would normally be understood by a person skilled in the art in the field to which this application relates. The terms used in the description of this application serve only to describe specific embodiments and are not intended to limit this application. The terms "comprise" and "feature" used in the description, claims, and accompanying drawings of this application, and all their variants, are intended to have a non-exclusive scope.

[0029] The “exemplarities” mentioned in this document mean that the specific features, structures, or properties described in the exemplary embodiments may be included in at least one exemplary embodiment of this application. The occurrence of the term “exemplarity” at different points in the description does not necessarily refer to the same exemplary embodiment, nor does it constitute an independent or alternative exemplary embodiment that excludes other exemplary embodiments. Persons skilled in the art expressly and implicitly understand that the exemplary embodiments described in this document may be combined with other exemplary embodiments.

[0030] The directional terms used in the following description refer to the directions shown in the drawings and do not restrict the specific structure of the cover assembly or cell of this application. For example, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "above", "below", "inside", "outside", etc., refer to the directions or positions shown in the drawings and serve only to simplify the description of this application. They are not to be understood as an indication or suggestion that the designated devices or elements must have a particular orientation or be designed and operated in a particular orientation, and are therefore not to be understood as a restriction of this application.

[0031] Furthermore, the terms "first", "second", etc. are used in the description and claims of this application or in the drawings mentioned above to distinguish between different objects and not to describe a particular sequence. They may explicitly or implicitly include one or more of these features.

[0032] In the description of this application, unless otherwise stated, “several” means two or more (including two), and similarly, “several groups” means two or more (including two).

[0033] In the description of this application, it should be noted that the terms "installed," "connected," and "linked" are to be understood in a broad sense without any express specification or limitation. For example, "linked" or "linked" in relation to a mechanical structure can mean a physical connection, such as a fixed connection, for example, by screws, bolts, or other spacers. A physical connection can also be a detachable connection, such as a mutual locking mechanism or a plug connection. A physical connection can also be an integral connection, such as a connection by welding, bonding, or integrated forming. For a person skilled in the art, the specific meaning of the above terms in this application is understandable from the specific circumstances."Connected" or "connecting" in relation to the circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection, for example, a direct connection (i.e., a physical connection), or an indirect connection via at least one intermediate element, as long as the circuit is continuous, or even a connection within two elements. A signal connection can refer not only to a signal connection via a circuit, but also to a signal connection via a media medium, such as radio waves. For a person skilled in the art, the specific meaning of the aforementioned terms in this application is understandable based on the specific circumstances.

[0034] The battery cell is the basic unit of a battery. It can be used individually to power electrical devices, or multiple battery cells can be used in combination. When multiple battery cells are used in combination, they can be electrically connected in series, parallel, or a combination of series and parallel, and communicate with the battery management system to form a battery pack. The aforementioned battery management system controls and monitors the operating status of the individual battery cells. Furthermore, multiple battery cells can first be connected in series and / or parallel, forming a battery module together with the module management system. Then, multiple battery modules are electrically connected in series, parallel, or a combination of series and parallel, and together with the battery management system, they form a battery pack.

[0035] Battery cells typically consist of a casing, an electrode assembly, and a lid assembly. The casing and lid assembly are connected to form a sealed cavity in which the electrode assembly is housed.

[0036] The electrode assembly is the smallest unit in the battery where electrochemical reactions take place and is used to charge and discharge the battery cell. The electrode assembly typically consists of a positive electrode, a negative electrode, and a membrane that separates the positive and negative electrodes. After the electrode assembly is installed in the receiving cavity, electrolyte is added. The electrolyte can penetrate the interior of the electrode assembly, thus providing a pathway for ion transport for the electrochemical reactions within the assembly and acting as a conductor.

[0037] The cover assembly typically comprises a cover plate and an output terminal connected to the cover plate. The output terminal is divided into a positive and a negative terminal. The positive output terminal is electrically connected to the positive electrode, and the negative output terminal is electrically connected to the negative electrode. Specifically, the positive output terminal and the positive electrode are electrically connected via an adapter plate, and the negative output terminal and the negative electrode are electrically connected via another adapter plate. Between the output terminals and the cover plate, from the outside in, an upper plastic layer, a sealing ring, and a lower plastic layer are arranged sequentially. The upper plastic layer serves to insulate between the output terminals and the cover plate or to achieve high resistance.The sealing ring serves to seal the edges of the outlet connections and is insulating. The lower plastic component ensures compression when the sealing ring is pressed in and is also insulating.

[0038] The cover assembly typically includes an explosion protection valve mounted on the cover plate. When the air pressure inside the battery cell reaches a certain value, the explosion protection valve opens to release the gases from inside the battery cell, preventing an explosion and ensuring the controlled venting of harmful gases.

[0039] However, if the strength of the cover plate is insufficient, deformation of the cover plate can occur during operation of the battery cell, leading to the following problems: 1. The seal between the cover plate and the output terminals deteriorates, which can easily result in the leakage of electrochemical substances from inside the casing; 2. Since the deformation of the cover plate dissipates some of the pressure, the opening pressure of the explosion protection valve increases, thus delaying its opening; by the time the valve opens, the pressure inside the battery cell often already exceeds the standard pressure, which can easily lead to an explosion and increases the hazard posed by the battery cell.

[0040] Against this background, the present application provides a battery cell lid assembly and a battery cell to solve the problem of slight deformation of the lid plate of an existing battery cell and to improve the reliability and safety in the use of the battery cell.

[0041] Fig. Figure 1 shows a schematic diagram of an exploded structure of a cover assembly provided by an embodiment of the present application. Fig. Figure 2 shows a sectional view of a lid assembly in its exploded state. Fig. Figure 3 shows an enlarged view of location A according to Fig. 2.

[0042] As in Fig. As shown in Figures 1 to 3, the present application provides a battery cell cover assembly 100 comprising a cover plate 110 and a reinforcement block 120, wherein the cover plate 110 is provided with a mounting section 111 which is designed as a recessed structure; and wherein the reinforcement block 120 is installed on the mounting section 111.

[0043] Fig. Figure 4 shows a schematic diagram of an exploded structure of a battery cell provided by an embodiment of the present application. With reference to Fig. 4. The cover plate 110 is adapted to the shape of the battery cell shell. For example, if the battery cell is square, the cover plate 110 has a rectangular shape and can cover the opening of the housing 200. If the battery is cylindrical, the cover plate 110 has a round shape and can cover the opening of the housing 200. In this embodiment, the structure of the cover assembly 100 is shown schematically using only a square battery as an example.

[0044] The cover plate 110 is typically welded all around to the opening of the housing 200. Electrode connections, an explosion protection valve, and a liquid filling hole are also mounted on the cover plate 110. The exact structure of the explosion protection valve and the electrode connections has already been described in detail above and will not be explained again here. The liquid filling hole is used to fill the receiving cavity with electrolyte. After the electrolyte has been filled, the liquid filling hole is sealed.

[0045] Mounting section 111 is a recessed structure on the cover plate 110. A recessed structure is a structure that is lowered relative to the flat surface of the cover plate 110. By designing mounting section 111 as a recessed structure and after installing the reinforcement block 120 in mounting section 111, the surface of the reinforcement block 120 can be kept essentially flush with the surface of the cover plate 110. Alternatively, by ensuring sufficient strength of the reinforcement block 120, the height by which the reinforcement block 120 protrudes above the surface of the cover plate 110 can be kept within a certain range in order to reduce the maximum thickness of the cover assembly 100 and thus reduce the volume of the battery cell.

[0046] The mounting section 111 can be arranged on the inside or outside of the cover plate 110, the inside being the side closer to the interior of the battery cell shell and the outside being the side closer to the exterior of the battery cell shell. Similarly, the reinforcement block 120 can also be arranged on the inside or outside of the cover plate 110, thus increasing the flexibility in its arrangement.

[0047] Furthermore, the number of mounting sections 111 can be one or more, and each mounting section 111 can be located on the inside or outside of the cover plate 110 without being affected by the positions of the other mounting sections 111. Regardless of whether one or more mounting sections 111 are provided, the shape, size, and dimensions of each mounting section 111 are not restricted, as long as the electrode connections, fluid filling holes, and explosion protection valves on the cover plate 110 are avoided.One or more assembly sections 111 can be arranged according to the distribution of the other parts on the cover plate 110, which allows for more flexibility in the position and number of the reinforcement blocks 120, thus facilitating a sensible arrangement of the number and position of the reinforcement blocks 120 without affecting the original structural features of the cover assembly 100 in order to increase the strength of the cover assembly 100.

[0048] For example, in some embodiments the mounting sections 111 are designed as cubic recesses and the reinforcement blocks 120 as cubes that match the mounting sections 111 in shape and size.

[0049] The reinforcement block 120 is a structure integrated into the mounting section 111, the shape of which is adapted to the shape of the mounting section 111. In any direction, the size of the reinforcement block 120 can be slightly larger than the size of the mounting section 111, slightly smaller than the size of the mounting section 111, or equal to the size of the mounting section 111.

[0050] After the reinforcement block 120 has been inserted into the assembly section 111, the reinforcement block 120 and the cover plate 110 can be further secured to make the connection between the reinforcement block 120 and the cover plate 110 more robust and to prevent the reinforcement block 120 from coming loose or falling off during use of the battery cell and thus reducing the reinforcing effect of the cover plate 110.

[0051] As the internal pressure of the battery cell increases, an outward force acts on the cover plate 110, causing it to bulge and deform outwards. To achieve further significant deformation of the cover plate 110, the tensile or shear force between the cover plate 110 and the reinforcement block 120 must be overcome in several directions. If the strength of the reinforcement block 120 is high, or if the interaction force between the reinforcement block 120 and the inner wall of the mounting section 111 is high, it is difficult to achieve significant deformation of the cover plate 110, thus negating the need for reinforcement of the cover plate 110.

[0052] It is understood that the reinforcing effect of the reinforcing block 120 on the cover plate 110 does not directly depend on, nor does it differ significantly from, whether the reinforcing block 120 is attached to the inside or the outside of the cover plate 110. As long as the reinforcing block 120 is attached to the cover plate 110, it can increase the strength of the cover plate 110 to some extent, reduce or even eliminate its deformation, and thus improve the reliability and safety of the battery cell in operation.

[0053] Therefore, the main body of the cover assembly 100 provided by the present application consists of a combination of the cover plate 110 and the reinforcing blocks 120 by attaching reinforcing blocks 120 to the cover plate 110.In contrast to a single cover plate 110, with the combined cover assembly 100, as soon as one side is subjected to a pressure surge, both the cover plate 110 and the reinforcement block 120 must be deformed simultaneously, and the relative force occurring between the cover plate 110 and the reinforcement block 120 must be overcome to produce deformation; this increases the deformation resistance of the cover plate 110, so that in the event of thermal runaway, the probability of a leak between the positive and negative output terminals and the cover plate 110, as well as a delayed opening of the explosion protection valve due to deformation of the cover plate 110 by the pressure inside the battery cell, is reduced, thus increasing the reliability and safety in the use of the battery cell.

[0054] The above analysis shows that the reinforcing effect of the reinforcing block 120 on the cover plate 110 is related both to the interaction force between the reinforcing block 120 and the cover plate 110 and to the material strength of the reinforcing block 120. The interaction force between the reinforcing block 120 and the cover plate 110, in turn, is related to the dimensions of the relative mounting section 111 of the reinforcing block 120. It is also related to the connection structure and type of connection between the reinforcing block 120 and the mounting section 111. Therefore, in the embodiment of the present application, several embodiments are proposed that can improve the reinforcing effect of the reinforcing block 120 on the cover plate 110, as follows.

[0055] In one possible construction, the dimension M of the reinforcement block 120 and the dimension N of the mounting section 111 satisfy the following condition in every direction except the thickness of the reinforcement block 120: M≤N+0.2 mm (millimeters).

[0056] The dimension of the reinforcement block in a particular direction refers to the distance between two points on the edge of the reinforcement block through which a straight line parallel to that direction passes. Depending on the shape of the reinforcement block and the position of the straight line, the dimensions at different points on the reinforcement block itself in the same direction can be the same or different. For example, if the reinforcement block is a cube, the dimensions at different positions along the cube's longitudinal axis are the same, whereas for a reinforcement block in the shape of an elliptical disk, the dimensions at different positions along the ellipse's long axis are different.

[0057] The thickness direction of the reinforcement block 120 corresponds to the depth direction of the assembly section 111, wherein in the above-mentioned embodiment there are no restrictions regarding the dimensions of the reinforcement block 120 and the assembly section 111 in this direction.

[0058] Using the example of the reinforcement block 120 as a cube block, the following applies: if the dimension N1 of the mounting section 111 in the longitudinal direction of the reinforcement block 120 is 50 mm, then the dimension M1 of the reinforcement block 120 in the longitudinal direction is ≤ 50.2 mm. If the dimension N2 of the mounting section 111 in the width direction of the reinforcement block 120 is 20 mm, then the dimension M2 of the reinforcement block 120 in the width direction is ≤ 20.2 mm.

[0059] The solution described above limits the dimension of the reinforcement block 120 in any direction to a range 0.2 mm larger than the mounting section 111, so that the reinforcement block 120 can be installed relatively easily in the mounting section 111 and no problems arise during installation.

[0060] In one possible design, the reinforcement block 120 is attached to the mounting section 111 of the cover plate 110 by welding, screwing or riveting.

[0061] The solution described above allows the reinforcement block 120 and the cover plate 110 to be connected to each other in one of the simple ways mentioned above, thereby reducing the difficulty of assembling the reinforcement block 120 and the cover plate 110.

[0062] When the reinforcing block 120 is welded to the cover plate 110, either fusion welding or overlay welding can be used, depending on the dimensions of the reinforcing block 120. For example, if the dimensions of the reinforcing block 120 are greater than or equal to the dimensions of the mounting section 111 in every direction except its thickness, there will be no or only a small gap between the reinforcing block 120 and the mounting section 111 due to the tight fit. Therefore, the edges of the reinforcing block 120 can be joined to the cover plate 110 by fusion welding to achieve a reinforcing effect.If the dimension of the reinforcement block 120 is smaller in every direction except its thickness than the dimension of the mounting section 111, molten welding material can be poured between the edges of the reinforcement block 120 and the mounting section 111 by means of overlay welding to join the reinforcement block 120 to the cover plate 110 and to fill and reinforce the joint.

[0063] In one possible design, the material strength of the reinforcement block 120 is greater than or equal to the material strength of the cover plate 110.

[0064] For example, if a cover plate 110 is made of aluminum material from series 3, the reinforcement block 120 can be made of aluminum material from a higher series, for example, aluminum material from series 6, 7 or 8. The higher the series number of an aluminum material, the higher its aluminum content and the higher its strength.

[0065] Due to the solution described above, the reinforcing block 120 itself exhibits high strength, so that adding the reinforcing block 120 does not reduce the local strength of the cover plate 110, nor does it further reduce the local strength of the cover assembly 100. Furthermore, the reinforcing block 120 does not deform easily when the cover plate 110 is subjected to a force, so that it can provide good support for the cover plate 110 over a long period and further impede deformation of the cover plate 110.

[0066] Regarding the mounting position of the reinforcement block 120, and considering that the edges of the cover plate 110 are generally welded to the housing 200, it is unlikely that the edges of the cover plate 110 will deform, as it is pulled by the housing 200; the further a part of the cover plate 110 is from the edges, the more easily it can deform. This means that the cover plate 110 can be most easily deformed in any direction except its thickness, most easily at its center.

[0067] Against this background, a cover plate 110 in the form of a cube block is taken as an example, and the cover plate 110 in a possible construction, as in Fig. Figure 1 shows a horizontal center line 130, wherein the horizontal center line 130 is the center line that bisects the inner side surface or outer side surface of the cover plate 110 along the width direction of the cover plate 110; the assembly section 111 is located at least partially on the horizontal center line 130.

[0068] It is understood that if the mounting section 111 is located on the inside of the cover plate 110, the horizontal center line 130 is the center line that bisects the inner side surface of the cover plate 110 along the width direction of the cover plate 110. If the mounting section 111 is located on the outside of the cover plate 110, the horizontal center line 130 is the center line that bisects the outer side surface of the cover plate 110 along the width direction of the cover plate 110.

[0069] In the width direction of the cover plate 110, the horizontal center line 130 is the center of the cover plate 110, and the area where the horizontal center line 130 is located encompasses the area of ​​the cover plate 110 that is most susceptible to deformation. The mounting section 111 is located at least partially on the horizontal center line 130. If the reinforcing block 120 is located in the mounting section 111, the area of ​​the cover plate 110 that is most susceptible to deformation is reinforced by the reinforcing block 120, thereby making deformation more difficult and thus improving the deformation resistance of the entire cover plate 110.

[0070] Once the reinforcing effect of the reinforcing block 120 on the cover plate 110 has been ensured, the aesthetics and volume of the cover plate 110 after the addition of the reinforcing block 120 must also be taken into account. Therefore, the thickness of the reinforcing block 120 can be less than or equal to the depth of the mounting section 111.

[0071] With the solution described above, the reinforcement block 120 does not protrude beyond the surface of the cover plate 110 after installation in the assembly section 111, so that no additional space is required, the volume of the cover assembly 100 is reduced and the surface of the cover plate 110 is relatively flat, which improves the aesthetics of the cover plate 110.

[0072] Although the reinforcement block 120 was illustrated in the aforementioned embodiments using the example of a cube block, the reinforcement block 120 can of course also have other shapes. Fig. Figure 5 shows a schematic diagram of an exploded structure of another cover assembly provided by an embodiment of the present application. Fig. Figure 6 shows a schematic diagram of an exploded structure of another cover assembly provided by an embodiment of the present application.

[0073] With reference to Fig. 5 and Fig. 6. If the reinforcement block is designed as a thin disc, the overall shape of the block can be a rounded rectangle when viewed from the inside or outside of the cover assembly (as shown in Figure 6). Fig. 5 shown), “X” (as shown in Fig. 6 shown), “Y”, “8”, a rhombus, a snake, an oval, etc. Provided that the requirements of the above-mentioned embodiments are met, the cover assembly 100 falls within the scope of protection of the present application, irrespective of the shape of the reinforcement block 120.

[0074] The present application continues to provide a battery cell, as described in Fig. As shown in Figure 4, the battery cell comprises a housing 200, an electrode assembly 300 and a cover assembly 100 in one of the above-mentioned embodiments, the cover assembly 100 being tightly connected to the circumference of the opening of the housing 200 and the electrode assembly 300 being arranged in the space enclosed by the cover assembly 100 and the housing 200.

[0075] The possible structures and advantageous effects of the housing 200, the electrode assembly 300 and the cover assembly 100 have already been explained in detail and will not be described again here.

[0076] When using the battery cell with the lid assembly 100 in one of the above-mentioned embodiments, chemical substances do not easily leak from the lid assembly 100, and in the event of thermal runaway, the probability of a delayed opening of the explosion protection valve is low, thereby increasing the reliability and safety of the battery cell.

[0077] The present application further provides a battery comprising a battery cell in the above embodiments.

[0078] The battery can be a battery pack or a battery module. If the battery is a battery pack, it specifically includes a battery management system and a number of the aforementioned battery cells. Several of these battery cells can be electrically connected in series, parallel, or a combination of both, and communicate with the battery management system to form a battery pack. The aforementioned battery management system controls and monitors the operating status of each individual battery cell. Furthermore, several battery cells can first be connected in series and / or parallel, forming a battery module together with the module management system. Then, several battery modules are electrically connected in series, parallel, or a combination of both, and together with the battery management system, they form a battery pack.

[0079] In this system, multiple battery cells can be installed on a support structure such as a housing, frame, or bracket within the aforementioned battery pack or module. The individual battery cells, as well as the battery management system, can be electrically connected via busbars or other connecting components. These battery cells can be lithium-ion, sodium-ion, or magnesium-ion batteries, and their outer shape can be cylindrical, flat, rectangular, or any other form.

[0080] In summary, the main body of the cover assembly 100 provided by the embodiment of the present application consists of a combination of the cover plate 110 and the reinforcing blocks 120 by attaching reinforcing blocks 120 to the cover plate 110.In contrast to a single cover plate 110, with the combined cover assembly 100, as soon as one side is subjected to a pressure surge, both the cover plate 110 and the reinforcement block 120 must be deformed simultaneously, and the relative force occurring between the cover plate 110 and the reinforcement block 120 must be overcome to produce deformation; this increases the deformation resistance of the cover plate 110, so that in the event of thermal runaway, the probability of a leak between the positive and negative output terminals and the cover plate 110, as well as a delayed opening of the explosion protection valve due to deformation of the cover plate 110 by the pressure inside the battery cell, is reduced, thus increasing the reliability and safety in the use of the battery cell.

Claims

[1] Battery cell lid assembly, characterized by that it includes: a cover plate which is provided with a mounting section, wherein the mounting section is designed as a recessed structure; a reinforcement block that is installed on the assembly section. [2] Cover assembly according to claim 1, characterized by that the cover plate has a horizontal center line which is a center line that bisects the inner side surface or outer side surface of the cover plate along the width direction of the cover plate; wherein the mounting section is located at least partially on the horizontal center line. [3] Cover assembly according to claim 1, characterized by , that the dimension M of the reinforcement block and the dimension N of the mounting section in every direction except the thickness of the reinforcement block satisfy the following condition: M≤N+0.2 mm. [4] Cover assembly according to claim 1, characterized bythat the thickness of the reinforcement block is less than or equal to the depth of the mounting section. [5] Cover assembly according to claim 1, characterized by that the material strength of the reinforcement block is greater than or equal to the material strength of the cover plate. [6] Cover assembly according to any one of claims 1 to 5, characterized by that the assembly sections are provided in a number of 1 or more than 1, with the reinforcement blocks being provided in a number of 1 or more than 1 accordingly. [7] Cover assembly according to any one of claims 1 to 5, characterized by , that the mounting section is located on the inside or outside of the cover plate, the inside being the side closer to the inside of the battery cell shell and the outside being the side closer to the outside of the battery cell shell. [8] Cover assembly according to any one of claims 1 to 5, characterized bythat the reinforcement block is attached to the mounting section of the cover plate by welding, screwing or riveting. [9] Battery cell, characterized by , comprising a housing, an electrode assembly and a cover assembly according to any one of claims 1 to 8, wherein the cover assembly is tightly connected to the circumference of the opening of the housing and the electrode assembly is arranged in the space enclosed by the cover assembly and the housing. [10] Battery, characterized by that it comprises a battery cell according to claim 9.

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