Cover plate assembly, shell and battery

Abstract

The invention relates to the field of batteries, and provides a cover plate assembly, a shell and a battery. The cover plate assembly comprises lower plastic, and a first limiting protrusion and a second limiting protrusion are formed on the lower plastic. The connecting sheet is mounted on the lower plastic through the first limiting bulge and the second limiting bulge; the position, relative to the lower plastic in the first direction, of the connecting piece is limited through the first limiting protrusion, the position, relative to the lower plastic in the second direction, of the connecting piece is limited through the second limiting protrusion, and in the plane parallel to the lower plastic, the first direction is perpendicular to the second direction. According to the cover plate assembly, the connecting piece can be accurately installed on the lower plastic, and position deviation in the assembling process is avoided; therefore, when the cover plate assembly is assembled with other parts of the battery, the cover plate assembly can be better matched with other parts of the battery, and the assembly precision of the whole battery module is improved; the problems of poor contact and the like caused by looseness of the connecting sheet are reduced, and the reliability and the safety of the battery are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and provides a cover plate assembly, a shell and a battery. BACKGROUND

[0002] In the design and manufacture of lithium-ion batteries, it is crucial to ensure accurate positioning between the connecting piece and the cover plate.

[0003] The function of the connecting piece is to act as a transfer piece to lead out electrical energy from the pole group to the outside. Specifically, the connecting piece is first connected to the tab of the pole group through ultrasonic welding, and then connected to the cover plate pole column bottom plate through laser welding, forming a complete electrical energy transmission path.

[0004] However, in the prior art, the connecting piece is prone to positional deviation during ultrasonic welding with the tab, causing subsequent assembly positioning problems or deviation. In addition, the positioning hole and the positioning column between the connecting piece and the cover plate are assembled in a gap, causing the connecting piece to deviate up and down after assembly, thereby affecting the assembly accuracy of the pole group. Finally, due to the positional deviation of the connecting piece, it may lap with the inner wall of the aluminum shell after secondary bending, increasing the risk of internal short circuit of the battery, which not only affects the performance and service life of the battery, but also poses a safety hazard. SUMMARY

[0005] The embodiment of the present application provides a cover plate assembly to solve the low positioning accuracy of the lower plastic and the connecting piece in the related art.

[0006] The embodiment of the present application further provides a shell.

[0007] The embodiment of the present application further provides a battery.

[0008] The first aspect of the embodiment of the present application provides a cover plate assembly, comprising: a lower plastic, a first limiting protrusion and a second limiting protrusion being formed on the lower plastic; a connecting piece, installed on the lower plastic through the first limiting protrusion and the second limiting protrusion; wherein the connecting piece defines a relative position with the lower plastic in a first direction through the first limiting protrusion, and the connecting piece defines a relative position with the lower plastic in a second direction through the second limiting protrusion, the first direction and the second direction being perpendicular in a plane parallel to the lower plastic.

[0009] According to an embodiment of the present application, the first limiting protrusion comprises: a corner limiting protrusion, disposed at an edge position of the lower plastic along the first direction; The intermediate limiting protrusion is formed on the lower plastic and away from the side corner limiting protrusion.

[0010] According to an embodiment of the present application, the side corner limiting protrusion and the intermediate limiting protrusion each include a first limiting edge extending in the first direction and a second limiting edge extending in the second direction.

[0011] According to an embodiment of the present application, the first limiting edge and the second limiting edge are connected to each other.

[0012] According to an embodiment of the present application, the first limiting edge is integrally formed with the lower plastic. and / or, The second limiting edge is integrally formed with the lower plastic.

[0013] According to an embodiment of the present application, the second limiting protrusion extends in the first direction.

[0014] According to an embodiment of the present application, the first limiting protrusion is in two groups, and the two groups of the first limiting protrusion are arranged at two ends of the lower plastic in the first direction.

[0015] According to an embodiment of the present application, the two groups of the first limiting protrusion are symmetrically arranged with respect to a center line in the width direction of the lower plastic.

[0016] The second aspect embodiment of the present application provides a shell comprising the cover plate assembly as described above.

[0017] The third aspect embodiment of the present application provides a battery comprising the cover plate assembly as described above. or comprising the shell as described above.

[0018] The cover plate assembly provided by the first aspect embodiment of the present application can accurately mount the connecting piece on the lower plastic, and avoid position deviation in the assembly process, because the first limiting protrusion and the second limiting protrusion respectively limit the connecting piece in the first direction and the second direction perpendicular to each other. This makes the cover plate assembly better match other components when assembled with other components of the battery, and improves the assembly precision of the entire battery module. The arrangement of the first limiting protrusion and the second limiting protrusion effectively limits the movement of the connecting piece, so that the connection between the connecting piece and the lower plastic is more stable. In the use process of the battery, even if subjected to external forces such as vibration and impact, the connecting piece is not easy to displace, which ensures the stability of the internal circuit connection of the battery, reduces the problem of poor contact caused by loose connecting piece, and improves the reliability and safety of the battery.

[0019] According to the shell provided by the second aspect of the present application, the accurate positioning and stable installation of the cover plate assembly make the connection inside the battery more reliable, and reduce the risk of internal short circuit of the battery caused by the displacement of the connecting piece. At the same time, the shell can effectively protect the internal components, prevent electrolyte leakage, external impurities intrusion and other problems, thereby greatly improving the safety of the battery and reducing the safety hazards in use. The shell is closely combined with the cover plate assembly to provide stable structural support for the battery. During the charging and discharging process of the battery, the pressure and heat generated by the internal chemical reaction can be effectively resisted, the stability of the internal structure of the battery is maintained, the influence of structural deformation on the performance of the battery is reduced, and the service life of the battery is prolonged.

[0020] According to the battery provided by the third aspect of the present application, the accurate positioning of the connecting piece in the cover plate assembly reduces the risk of displacement of the connecting piece during use of the battery, ensures the stability of the internal circuit connection of the battery, helps to improve the charging and discharging performance of the battery, reduces the problems such as capacity reduction and charging and discharging efficiency reduction of the battery caused by unstable connection, thereby improving the reliability of the battery and prolonging the service life of the battery. The close connection of the lower plastic with other parts of the battery and the effective limiting of the connecting piece reduce the possibility of internal short circuit of the battery. At the same time, the sealing effect of the cover plate assembly on the inside of the battery prevents the electrolyte leakage from causing harm to the user and the safety hazards caused by the entry of external substances into the inside of the battery, thereby enhancing the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0022] Fig. 1 is a schematic front view of the lower plastic provided by the present application.

[0023] Fig. 2 is a schematic front view of the lower plastic and the connecting piece provided by the present application.

[0024] Reference signs: 100, lower plastic; 102, first limiting protrusion; 104, second limiting protrusion; 106, connecting piece; 108, corner limiting protrusion; 110, middle limiting protrusion; 112, first limiting edge; 114, second limiting edge. DETAILED DESCRIPTION

[0025] The embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0026] As Figs. 1-2 shown in the first aspect of the present application, an embodiment provides a cover plate assembly, comprising: a lower plastic 100, wherein a first limiting protrusion 102 and a second limiting protrusion 104 are formed on the lower plastic 100; a connecting sheet 106, which is installed on the lower plastic 100 through the first limiting protrusion 102 and the second limiting protrusion 104; wherein the connecting sheet 106 is limited in the relative position with the lower plastic 100 in a first direction through the first limiting protrusion 102, and the connecting sheet 106 is limited in the relative position with the lower plastic 100 in a second direction through the second limiting protrusion 104, and the first direction and the second direction are perpendicular in the plane parallel to the lower plastic 100.

[0027] According to the cover plate assembly provided by the first aspect of the present application, since the first limiting protrusion 102 and the second limiting protrusion 104 limit the connecting sheet 106 in the first direction and the second direction perpendicular to each other respectively, the connecting sheet 106 can be accurately installed on the lower plastic 100, avoiding position deviation in the assembly process. This makes the cover plate assembly better match other components when assembling with other components of the battery, improving the assembly accuracy of the entire battery module. The setting of the first limiting protrusion 102 and the second limiting protrusion 104 effectively limits the movement of the connecting sheet 106, making the connection between the connecting sheet 106 and the lower plastic 100 more stable. During the use of the battery, even if affected by external forces such as vibration and impact, the connecting sheet 106 is not easy to displace, ensuring the stability of the internal circuit connection of the battery, reducing the problem of poor contact caused by the loosening of the connecting sheet 106, and improving the reliability and safety of the battery.

[0028] Please continue to refer to Figs. 1-2 , the lower plastic 100 is usually made of plastic material with certain strength and insulation performance.

[0029] The first limiting protrusion 102 can be a continuous long strip or a block distributed at intervals. Its height can be between 1mm and 3mm, and its width can be between 2mm and 5mm. The specific size can be determined according to the size of the lower plastic 100 and the limiting requirement of the connecting sheet 106. The first limiting protrusion 102 extends along the first direction and is integrally formed with the lower plastic 100, ensuring that it is firmly connected with the lower plastic 100.

[0030] The second limiting protrusion 104 extends along the second direction, and the second limiting protrusion 104 is also integrally formed with the lower plastic 100, ensuring the stability of the structure.

[0031] The connecting piece 106 is generally made of metal material with good electrical conductivity, such as copper, aluminum, etc. Its shape is designed according to the structure and connection requirements of the battery, and is usually rectangular or has a certain bending structure.

[0032] The connecting piece 106 is placed on the lower plastic 100, and the edge of the connecting piece 106 is fitted with the first limiting protrusion 102 and the second limiting protrusion 104. The first limiting protrusion 102 blocks the movement of the connecting piece 106 in the first direction, and the second limiting protrusion 104 blocks the movement of the connecting piece 106 in the second direction, thereby realizing the positioning of the connecting piece 106 and the lower plastic 100 in two perpendicular directions. In an embodiment of the present application, the first direction can be the X direction as shown in Fig. 1 , and the second direction can be the Y direction as shown in Fig. 2 .

[0033] According to an embodiment of the present application, the first limiting protrusion 102 includes: corner limiting protrusion 108, which is arranged at the edge position of the lower plastic 100 in the first direction; The middle limiting protrusion 110 is formed on the lower plastic 100 and away from the side of the corner limiting protrusion 108.

[0034] In an embodiment of the present application, the corner limiting protrusion 108 is located at the edge position of the lower plastic 100, and the cavity corresponding to the corner position is protrudingly designed in the mold, so that the corner limiting protrusion 108 extends outward from the edge of the lower plastic 100 after injection molding. For example, the height of the corner limiting protrusion 108 can be between 1 mm and 3 mm, the width can be between 2 mm and 5 mm, and the length can be adjusted according to the edge length of the lower plastic 100 and the actual requirements, and is usually between 10 mm and 30 mm.

[0035] The middle limiting protrusion 110 is formed on the lower plastic 100 and away from the side of the corner limiting protrusion 108. The middle limiting protrusion 110 not only ensures good limiting effect on the connecting piece 106 together with the corner limiting protrusion 108, but also does not affect other structures and functions of the lower plastic 100. The height, width and length of the middle limiting protrusion 110 are matched with those of the corner limiting protrusion 108, and are generally between 1 mm and 3 mm in height, between 2 mm and 5 mm in width, and between 10 mm and 30 mm in length.

[0036] The design of the first limiting protrusion 102 provides multi-directional and more accurate positioning for the connecting sheet 106. The corner limiting protrusion 108 and the middle limiting protrusion 110 cooperate to limit the connecting sheet 106 from different positions. The corner limiting protrusion 108 limits the displacement of the connecting sheet 106 at the edge, and the middle limiting protrusion 110 further restricts the connecting sheet 106 at the middle position, so that the position of the connecting sheet 106 in the plane is more accurately defined when it is installed with the lower plastic 100, greatly improving the positioning accuracy of the connecting sheet 106 and the lower plastic 100, and effectively reducing the displacement of the connecting sheet 106 during assembly.

[0037] The multiple limiting protrusions work together to increase the stability of the connecting sheet 106 installation. The connecting sheet 106 is not prone to displacement or shaking under external force or during battery production, use, and other situations such as vibration and impact. This helps to ensure the stability of the internal connection of the battery, reduces the risk of internal short circuit of the battery caused by displacement of the connecting sheet 106, and improves the performance and reliability of the battery.

[0038] According to an embodiment of the present application, the corner limiting protrusion 108 and the middle limiting protrusion 110 each include a first limiting edge 112 and a second limiting edge 114, the first limiting edge 112 extending in a first direction, and the second limiting edge 114 extending in a second direction.

[0039] In an embodiment of the present application, the corner limiting protrusion 108 and the middle limiting protrusion 110 can be integrally formed by using an injection molding process when the lower plastic 100 is manufactured.

[0040] In the mold design stage, according to the setting of the first direction and the second direction, the cavity structure corresponding to the first limiting edge 112 and the second limiting edge 114 is constructed. For example, if the first direction is the length direction of the lower plastic 100 and the second direction is the width direction, in the mold, the cavity of the first limiting edge 112 is arranged in the length direction, and the cavity of the second limiting edge 114 is arranged in the width direction.

[0041] This design allows the connecting sheet 106 to be accurately positioned in two perpendicular directions. The first limiting edge 112 extends in the first direction, effectively limiting the displacement of the connecting sheet 106 in the second direction, and the second limiting edge 114 extends in the second direction, limiting the movement of the connecting sheet 106 in the first direction. This ensures that the position of the connecting sheet 106 in the plane is accurately fixed when it is installed on the lower plastic 100, greatly improving the positioning accuracy of the connecting sheet 106 and the lower plastic 100, reducing the displacement of the connecting sheet 106 during subsequent assembly, and thus improving the assembly accuracy of the battery pole group and reducing the risk of internal short circuit of the battery.

[0042] According to an embodiment of the present application, the first limiting edge 112 is connected with the second limiting edge 114.

[0043] In an embodiment of the present application, the first limiting edge 112 is connected with the second limiting edge 114, which enhances the overall structural strength of the first limiting protrusion 102. When the connecting sheet 106 is installed on the lower plastic 100, the integrated limiting structure can better withstand external forces generated during the assembly and use of the connecting sheet 106, and is not prone to deformation or damage. At the same time, the continuous limiting structure further improves the limiting effect on the connecting sheet 106, preventing the connecting sheet 106 from shaking or shifting at the junction of the two limiting directions, making the positioning of the connecting sheet 106 more stable, thereby ensuring the stability of the internal structure of the battery and improving the performance and safety of the battery.

[0044] According to an embodiment of the present application, the first limiting edge 112 is integrally formed with the lower plastic 100; and / or, The second limiting edge 114 is integrally formed with the lower plastic 100.

[0045] In an embodiment of the present application, if the first limiting edge 112 is integrally formed with the lower plastic 100, the cavity of the first limiting edge 112 and the cavity of the main body of the lower plastic 100 can be designed as a continuous whole through a mold during injection molding of the lower plastic 100. Similarly, if the second limiting edge 114 is integrally formed with the lower plastic 100, a similar mold design and injection molding process can be used. If both are integrally formed with the lower plastic 100, the mold design can be set to have a cavity structure corresponding to the position and structure of the two limiting edges to ensure smooth injection molding.

[0046] The first limiting edge 112 or the second limiting edge 114 is integrally formed with the lower plastic 100, which significantly improves the connection strength between the limiting edge and the lower plastic 100. The integrally formed structure does not have the problem of loose connection. This allows the limiting edge to more stably limit the connecting sheet 106, ensuring the positioning accuracy of the connecting sheet 106 during battery production and use, effectively reducing the displacement of the connecting sheet 106 caused by loose limiting edges, reducing the risk of internal short circuit of the battery, and improving the reliability and service life of the battery.

[0047] According to an embodiment of the present application, the second limiting protrusion 104 extends in the first direction.

[0048] In an embodiment of the present application, the straightness error of the second limiting protrusion 104 in the first direction needs to be controlled within ±0.2 millimeters.

[0049] The second limiting protrusion 104 extends along the first direction, that is, the second limiting protrusion 104 can limit the relative position of the connecting piece 106 in the second direction relative to the lower plastic 100, so that the second limiting protrusion 104 provides a more stable limiting effect on the connecting piece 106 in the second direction. The positions of the connecting piece 106 in the second direction can all be limited by the second limiting protrusion 104, further enhancing the positioning stability of the connecting piece 106 in this direction. This helps to more accurately control the position of the connecting piece 106, reduces the deviation of the connecting piece 106 in the second direction, thereby improving the assembly accuracy of the battery pole group, ensuring the stability of the internal connection of the battery, and reducing the probability of battery failure.

[0050] According to an embodiment of the present application, the first limiting protrusion 102 is two groups, and the two groups of first limiting protrusions 102 are arranged at both ends of the lower plastic 100 along the first direction.

[0051] In an embodiment of the present application, the process parameters of the two groups of first limiting protrusions 102 are the same during the molding process. The two groups of first limiting protrusions 102 located at both ends of the lower plastic 100 limit the connecting piece 106 from both ends, forming a more stable positioning structure. Thus, both ends of the connecting piece 106 in the second direction are accurately limited, greatly improving the positioning accuracy of the connecting piece 106 in this direction, effectively preventing the overall deviation of the connecting piece 106 in the second direction. Reducing the risk of internal short circuit of the battery caused by the deviation of the connecting piece 106, improving the performance and safety of the battery.

[0052] According to an embodiment of the present application, the two groups of first limiting protrusions 102 are symmetrically arranged with the center line of the width direction of the lower plastic 100.

[0053] In an embodiment of the present application, the two groups of first limiting protrusions 102 are symmetrically arranged, so that the limiting force on the connecting piece 106 in the second direction is more uniform. When the connecting piece 106 is installed on the lower plastic 100, the limiting effect on both ends is consistent, and there is no torsion or deviation caused by uneven limiting. This further improves the positioning accuracy of the connecting piece 106 and the lower plastic 100, ensures the symmetry and stability of the internal structure of the battery, helps to improve the performance consistency of the battery, reduces the probability of battery failure, and improves the overall quality of the battery.

[0054] The second aspect of the present application provides a shell comprising the cover plate assembly as described above.

[0055] In the shell design of the second aspect of the present application, the cover plate assembly as a key part is closely combined with other structures of the shell to form a complete shell structure.

[0056] The shell can be generally made of metal materials (such as aluminum alloy, stainless steel) or high-strength engineering plastics to ensure sufficient strength and stability. The shape and size are designed according to the specifications and application scenarios of the battery, and common shapes include square, cylindrical, etc. During the manufacturing process of the shell, mounting positions and connecting structures that are adapted to the cover plate assembly are reserved.

[0057] When the cover plate assembly is mounted on the shell, first, the lower plastic 100 of the cover plate assembly is precisely aligned with the mounting position of the shell. If the shell is made of metal, the cover plate assembly can be fixed by welding, riveting or bolt connection. Taking welding as an example, before welding, the connecting position needs to be cleaned and pretreated, and then laser welding or resistance welding process is used to firmly connect the cover plate assembly to the shell, to ensure the connection strength and sealing. If the shell is made of plastic, hot melt connection or buckle connection can be used. When hot melt connection is used, the plastic at the connecting position is melted by heating, and then pressure is applied to make it fuse; when buckle connection is used, buckles and slots that match each other are respectively arranged on the shell and the cover plate assembly, and the buckles are inserted into the slots during installation.

[0058] According to the shell provided by the second aspect of the present application, the precise positioning and stable installation of the cover plate assembly make the connection inside the battery more reliable, and reduce the risk of internal short circuit of the battery caused by displacement of the connecting piece 106. At the same time, the shell can effectively protect the internal components, prevent electrolyte leakage, external impurities intrusion and other problems, thereby greatly improving the safety of the battery and reducing the safety hazards in use. The shell and the cover plate assembly are closely combined to provide stable structural support for the battery. During the charging and discharging process of the battery, the pressure and heat generated by the internal chemical reaction can be effectively resisted, the stability of the internal structure of the battery is maintained, the influence of structural deformation on the performance of the battery is reduced, and the service life of the battery is prolonged.

[0059] The third aspect of the present application provides a battery comprising the cover plate assembly as described above; or comprising the shell as described above.

[0060] The battery provided by the third aspect of the present application, when the battery uses the cover plate assembly as described above, the lower plastic 100 of the cover plate assembly is closely combined with other parts of the battery through a specific process. If the battery shell is made of metal, the lower plastic 100 can be connected to the shell through sealing glue or mechanical fixing parts to ensure the sealing and stability of the connection, prevent electrolyte leakage and external impurities from entering the battery.

[0061] The connecting piece 106 plays a conductive role inside the battery, one end of the connecting piece 106 is connected with the pole lug of the pole group of the battery, and the connection can be ensured firm by using processes such as ultrasonic welding to reduce the contact resistance and ensure the stability of current transmission. The connecting piece 106 is accurately installed on the lower plastic 100 through the first limiting protrusion 102 and the second limiting protrusion 104, and the two limiting protrusions ensure the accurate position of the connecting piece 106 in the plane, so that the connection between the connecting piece 106 and the electrode outside the battery is more reliable, and the problem of poor contact caused by the position deviation of the connecting piece 106 is reduced.

[0062] When the battery contains the above-mentioned shell, the shell serves as an external protective structure of the battery, providing a stable physical environment for the internal components. The size and shape of the shell cavity are accurately matched with the components such as the battery cell and electrolyte inside the battery, ensuring that the layout of these components in the shell is reasonable and stable.

[0063] The cover plate assembly installed on the shell, after the connecting piece 106 is connected with the pole lug of the battery cell, the entire circuit of the battery is completely constructed. At the same time, the material and structural design of the shell can effectively resist external physical impact, chemical corrosion and other adverse factors. For example, the metal shell has high strength and can prevent the internal components of the battery from being damaged when the battery is impacted; and the plastic shell has good insulation performance and corrosion resistance, which can protect the electrochemical system inside the battery from the influence of the external environment.

[0064] According to the third aspect of the present application, the precise positioning of the connecting piece 106 in the cover plate assembly reduces the risk of displacement of the connecting piece 106 during the use of the battery, ensuring the stability of the internal circuit connection of the battery, which helps to improve the charge and discharge performance of the battery, reduces the problems such as capacity reduction and charge and discharge efficiency reduction caused by unstable connection, thereby improving the reliability of the battery and prolonging the service life of the battery. The close connection of the lower plastic 100 with other parts of the battery and the effective limiting of the connecting piece 106 reduce the possibility of internal short circuit of the battery. At the same time, the sealing effect of the cover plate assembly on the inside of the battery prevents the electrolyte leakage from causing harm to the user and the safety hazards caused by the entry of external substances into the inside of the battery, thereby enhancing the safety of the battery.

[0065] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that, include: The lower plastic (100) has a first limiting protrusion (102) and a second limiting protrusion (104) formed on it. The connecting piece (106) is mounted on the lower plastic (100) via the first limiting protrusion (102) and the second limiting protrusion (104). The connecting piece (106) is positioned relative to the lower plastic (100) in a first direction by the first limiting protrusion (102), and the connecting piece (106) is positioned relative to the lower plastic (100) in a second direction by the second limiting protrusion (104). In a plane parallel to the lower plastic (100), the first direction and the second direction are perpendicular.

2. The cover plate assembly according to claim 1, characterized in that, The first limiting protrusion (102) includes: An edge-limiting protrusion (108) is provided at the edge of the lower plastic (100) along the first direction; A central limiting protrusion (110) is formed on the lower plastic (100) and on the side away from the corner limiting protrusion (108).

3. The cover plate assembly according to claim 2, characterized in that, Both the corner limiting protrusion (108) and the middle limiting protrusion (110) include a first limiting edge (112) and a second limiting edge (114), the first limiting edge (112) extending along the first direction and the second limiting edge (114) extending along the second direction.

4. The cover plate assembly according to claim 3, characterized in that, The first limiting edge (112) and the second limiting edge (114) are connected to each other.

5. The cover plate assembly according to claim 3, characterized in that, The first limiting edge (112) is integrally formed with the lower plastic (100); And / or, The second limiting edge (114) is integrally formed with the lower plastic (100).

6. The cover plate assembly according to claim 3, characterized in that, The second limiting protrusion (104) extends along the first direction.

7. The cover plate assembly according to any one of claims 1 to 5, characterized in that, The first limiting protrusion (102) consists of two sets, and the two sets of the first limiting protrusion (102) are disposed at both ends of the lower plastic (100) along the first direction.

8. The cover plate assembly according to claim 7, characterized in that, The two sets of the first limiting protrusions (102) are symmetrically arranged about the center line of the width direction of the lower plastic (100).

9. A housing, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 8; Alternatively, it may include the housing as described in claim 9.

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