Cover plate assembly, individual battery cells, battery modules, battery packs and electrical equipment

Abstract

This application discloses a cover plate assembly, a battery cell, a battery module, a battery pack, and an electrical device, belonging to the field of battery technology. The cover plate assembly includes: a cover plate body and an adapter plate; the cover plate body has a clearance hole; the adapter plate passes through the clearance hole, with the portion of the adapter plate on one side of the cover plate body used to connect with the tab of the electrode core, and the portion of the adapter plate on the other side of the cover plate body used to connect with the adapter plate of an adjacent battery cell. This application simplifies the structure of the electrode post, reduces the internal resistance of the adapter plate, and provides the adapter plate with stronger current carrying capacity, better high-temperature resistance, and superior performance under high current conditions.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a cover plate assembly, a battery cell, a battery module, a battery pack, and an electrical device. Background Technology

[0002] Battery cells are typically equipped with terminals, which can lead to problems such as poor current carrying capacity, numerous parts and processes, poor connection strength, and low reliability.

[0003] Related technologies have led to the development of a cover plate assembly that can replace the function of the terminal post. Although this reduces the number of parts in a single battery cell, the integrated design of the cover plate assembly results in poor structural reliability and poor reliability in the connection between the cover plate assembly and the terminal tabs, which requires improvement. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a cover plate assembly, a battery cell, a battery module, a battery pack, and an electrical device, which simplifies the structure of the battery cell and reduces costs.

[0005] In a first aspect, this application provides a cover plate assembly, comprising:

[0006] The cover plate body has clearance holes.

[0007] An adapter piece is provided, which passes through the clearance hole. The portion of the adapter piece located on one side of the cover plate body is used to connect with the tab of the electrode core, and the portion of the adapter piece located on the other side of the cover plate body is used to connect with the adapter piece of the adjacent battery cell.

[0008] According to the cover plate assembly of this application, by setting a cover plate body and an adapter piece, the adapter piece is an integral structure and passes through the clearance hole of the cover plate body. The adapter piece is connected to the electrode tab and the adapter piece respectively. Compared with the electrode post made of multiple segments in the related technology, the structure of the electrode post and the production cost are simplified, thereby simplifying the structure of the battery cell and improving the current carrying capacity of the current carrying components such as the adapter piece, thereby improving the high temperature resistance and high current performance of the battery cell.

[0009] According to one embodiment of this application, the adapter includes a first part and a second part connected in sequence. The first part has a first connecting segment for connecting to the adapter of an adjacent battery cell, and the second part has a second connecting segment for connecting to the tab of the electrode core. The outer diameter of the first part is smaller than the outer diameter of the second part.

[0010] According to one embodiment of this application, the first part includes a first segment and a second segment connected together, the outer diameter of the first segment is smaller than the outer diameter of the second segment, the first segment has a first connecting segment, and the end of the second segment opposite to the first segment is connected to the second part.

[0011] According to one embodiment of this application, the cover plate assembly further includes a seal disposed between the adapter piece and the clearance hole.

[0012] According to one embodiment of this application, the second part is provided with an annular groove, the annular groove being disposed opposite to the clearance hole, and at least a portion of the seal is located within the annular groove.

[0013] According to one embodiment of this application, the sealing element includes a first sealing section, a second sealing section, and a third sealing section connected in sequence, wherein the second sealing section is disposed between the adapter piece and the clearance hole, and the first sealing section and the third sealing section are located on the side wall of the adapter piece.

[0014] According to one embodiment of this application, the cover plate assembly further includes a support component, which is positioned and engaged with the second portion.

[0015] According to one embodiment of this application, the support component includes a first support member and a second support member, the first support member and the second support member are connected, the first support member and the second support member surround to form a through hole, and the second portion passes through the through hole and the avoidance hole.

[0016] According to one embodiment of this application, the first support member is provided with a first connector, and the second support member is provided with a second connector that plugs into the first connector; and / or,

[0017] The support component is provided with a first connector, and the second part is provided with a second connector that plugs into the first connector, wherein the first connector and the second connector are positioned and engaged; and / or,

[0018] The first support member and the second support member have clearance grooves at their ends opposite to the cover plate body, the clearance grooves being used to avoid the electrode tabs; and / or,

[0019] The support component is provided with a plurality of weight-reducing holes, which are spaced apart along the extension direction of the support component.

[0020] According to one embodiment of this application, the cover plate body is provided with an injection hole;

[0021] The cover plate assembly further includes an adhesive limiting mechanism adapted to be disposed between the cover plate body and the support assembly. The adhesive limiting mechanism surrounds the outer side of the adapter piece and is spaced apart from the outer side of the adapter piece to form an adhesive injection channel. The adhesive injection hole communicates with the adhesive injection channel.

[0022] Secondly, this application provides a single battery cell, comprising:

[0023] case;

[0024] The electrode core is provided with electrode tabs;

[0025] As described in any of the above embodiments, the cover plate assembly has a cover plate body that forms a receiving cavity with the housing, the electrode core is disposed in the receiving cavity, and the adapter piece of the cover plate assembly is connected to the electrode tab.

[0026] According to the battery cell of this application, by setting a cover plate assembly, the cover plate assembly includes a cover plate body and an adapter piece. The adapter piece is an integral structure and passes through the clearance hole of the cover plate body. The adapter piece is connected to the electrode tab and the adapter piece respectively. Compared with the multi-segment spliced ​​electrode post in related technologies, the structure of the electrode post and the production cost are simplified, thereby simplifying the structure of the battery cell and improving the current carrying capacity of the current carrying components such as the adapter piece, thereby improving the high temperature resistance and high current performance of the battery cell.

[0027] According to one embodiment of this application, the electrode tab is connected to the adapter piece by lap welding, and the area where the electrode tab is welded to the adapter piece is located between the first support member and the second support member of the cover plate assembly.

[0028] According to one embodiment of this application, the electrode core includes two electrodes, and the two tabs of the two electrodes are respectively connected to both sides of the adapter piece by lap welding.

[0029] Thirdly, this application provides a battery module, including a connecting piece and at least two battery cells as described in any of the above embodiments, wherein the connecting pieces of two adjacent battery cells are connected by the adapter piece.

[0030] According to the battery module of this application, by setting a cover plate assembly, the cover plate assembly includes a cover plate body and an adapter piece. The adapter piece is an integral structure and passes through the clearance hole of the cover plate body. The adapter piece is connected to the electrode tab and the adapter piece respectively. Compared with the multi-segment spliced ​​electrode post in related technologies, the structure of the electrode post is simplified and the production cost is reduced, thereby simplifying the structure of the battery cell and improving the current carrying capacity of the adapter piece and other current-carrying components, thereby improving the high temperature resistance and high current performance of the battery cell.

[0031] According to one embodiment of this application, the battery module further includes a tray, on which at least two of the battery cells are disposed.

[0032] Fourthly, this application provides a battery pack including a battery module as described in any of the above embodiments.

[0033] According to the battery pack of this application, by setting a cover plate assembly, the cover plate assembly includes a cover plate body and an adapter piece. The adapter piece is an integral structure and passes through the clearance hole of the cover plate body. The adapter piece is connected to the electrode tab and the adapter piece respectively. Compared with the multi-segment spliced ​​electrode post in related technologies, the structure of the electrode post is simplified and the production cost is reduced, thereby simplifying the structure of the battery cell and improving the current carrying capacity of the current carrying components such as the adapter piece, thereby improving the high temperature resistance and high current performance of the battery cell.

[0034] Fifthly, this application provides an electrical device including a battery module as described in any of the above embodiments.

[0035] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a schematic diagram of the battery module provided in the embodiments of this application;

[0038] Figure 2 This is one of the structural schematic diagrams of a battery cell provided in the embodiments of this application;

[0039] Figure 3 This is the second schematic diagram of the structure of a single battery cell provided in the embodiments of this application;

[0040] Figure 4 This is one of the structural schematic diagrams of the cover plate assembly provided in the embodiments of this application;

[0041] Figure 5 This is a second schematic diagram of the structure of the cover plate assembly provided in the embodiments of this application;

[0042] Figure 6 This is the third structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0043] Figure 7 This is the fourth structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0044] Figure 8This is the fifth structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0045] Figure 9 This is the sixth structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0046] Figure 10 This is the seventh structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0047] Figure 11 This is the eighth schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0048] Figure 12 This is the ninth structural schematic diagram of the cover plate assembly provided in the embodiments of this application;

[0049] Figure 13 This is the tenth structural schematic diagram of the cover plate assembly provided in the embodiments of this application.

[0050] Figure label:

[0051] 1000 cells per battery.

[0052] Cover plate assembly 100, cover plate body 11, clearance hole 111, glue injection hole 112, explosion-proof valve 113, liquid injection hole 114, adapter piece 2, first part 21, first section 211, second section 212, second part 22, annular groove 221, second plug-in piece 222, sealing piece 3, first sealing section 31, second sealing section 32, third sealing section 33, support assembly 4, first support piece 41, first connector 411, second support piece 42, second connector 421, through hole 43, clearance groove 44, weight reduction hole 45, glue limiting mechanism 5;

[0053] Core 200, tab 201, housing 300, connecting piece 400. Detailed Implementation

[0054] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0055] The following is for reference. Figures 1-13 This application describes a cover plate assembly 100, a battery cell 1000, a battery module, a battery pack, and an electrical device according to embodiments of the present application.

[0056] The core of a battery cell includes, but is not limited to, lithium batteries and sodium batteries.

[0057] like Figure 1 and Figure 8As shown, the cover plate assembly 100 of this application embodiment includes: a cover plate body 11 and an adapter piece 2.

[0058] like Figure 9 As shown, the cover plate body 11 has a clearance hole 111. The clearance hole 111 can be shaped to match the cross-section of the adapter piece 2. The inner diameter of the clearance hole 111 is slightly larger than the outer diameter of the cross-section of the adapter piece 2, so that the adapter piece 2 can be inserted into the clearance hole 111.

[0059] like Figure 4 As shown, the adapter 2 is electrically connected to the tab 201 and the adapter 2 of the adjacent battery cell 1000, respectively.

[0060] Tab 201 is the part of the battery cell 1000 used for connection to external circuitry, and is usually located at the positive and negative terminals of the electrode core 200, such as... Figure 4 As shown, the portion of the adapter piece 2 located on one side of the cover plate body 11 is used to connect with the tab 201 of the electrode core 200. The material of the adapter piece 2 can be the same as or similar to the material of the tab 201 so that the metal bonding is more secure when connected.

[0061] The electrode tab 201 includes two types: positive and negative. The adapter piece 2 can also be divided into two types: positive and negative. The positive and negative adapter pieces 2 are electrically connected to the positive and negative electrodes respectively. The positive and negative adapter pieces 2 are the same size.

[0062] The adapter piece 2 connected to the positive electrode tab can be made of aluminum alloy and is made of the same or similar material as the positive electrode tab. The adapter piece 2 connected to the negative electrode tab can be made of aluminum alloy and copper parts, with the copper part connected to the negative electrode tab. The two parts of the aluminum alloy and copper parts can be connected by welding. For example, the two parts of the aluminum alloy and copper parts can be connected by friction stir welding.

[0063] The tab 201 and the adapter 2 can be connected by welding methods such as lap welding, for example, laser welding or ultrasonic welding.

[0064] like Figure 10 and Figure 11 As shown, the adapter piece 2 can be sheet-shaped, with a large planar area and a small thickness. The length and width of the adapter piece 2 are much greater than its thickness, which increases the cross-sectional area of ​​the adapter piece 2, allowing it to carry a larger current. Compared to the small cross-sectional area of ​​the electrode post, this reduces the internal resistance. The adapter piece 2 serves as a connector and conductor. Its greater mechanical strength makes it less prone to bending or deformation under external forces. The larger cross-sectional area can carry a larger current and allow the current to flow smoothly. Moreover, compared to the electrode post, the adapter piece 2 has a sheet-like structure, resulting in a stronger current-carrying capacity and improved high-temperature resistance and high-current performance of the battery cell 1000.

[0065] like Figure 1 As shown, the portion of the adapter piece 2 located on the other side of the cover plate body 11 is used to connect with the adapter piece 2 of the adjacent battery cell 1000. The adapter pieces 2 between adjacent battery cells 1000 can be connected by welding methods such as lap welding, for example, laser welding or ultrasonic welding.

[0066] The electrical connections at both ends of the adapter plate 2 can be completed by welding or other methods, which improves the connection effect of the electrical connections at both ends of the adapter plate 2, increases the reliability of the connection, and reduces the connection resistance.

[0067] Compared to battery cells with terminal structures in related technologies, terminals are mostly composed of multiple structures spliced ​​together. The multiple electrical connections of multiple structures can reduce the reliability of the terminals and affect their overcurrent capacity.

[0068] According to the cover plate assembly 100 provided in the embodiments of this application, by setting a cover plate body 11 and an adapter piece 2, the adapter piece 2 is an integral structure and is inserted into the clearance hole 111 of the cover plate body 11. The adapter piece 2 is connected to the electrode tab 201 and the adapter piece 2 respectively. Compared with the electrode post formed by splicing multiple segments in the related technology, the structure of the electrode post and the production cost are simplified, thereby simplifying the structure of the battery cell 1000, improving the current carrying capacity of the current carrying components such as the adapter piece 2, and thus improving the high temperature resistance and high current performance of the battery cell 1000.

[0069] In some embodiments, such as Figure 8 As shown, the adapter piece 2 includes a first part 21 and a second part 22 connected in sequence. The first part 21 and the second part 22 can be integrally formed or welded together.

[0070] The first part 21 has a first connecting section for connecting to the adapter piece 2 of the adjacent battery cell 1000, and the second part 22 has a second connecting section for connecting to the tab 201 of the electrode core 200.

[0071] like Figure 10 and Figure 11 As shown, the outer diameter of the first part 21 is smaller than the outer diameter of the second part 22, forming an expanded diameter structure, which facilitates the assembly of the adapter piece 2 and the seal 3.

[0072] In this embodiment, the cross-sectional area of ​​the first part 21 is smaller than that of the second part 22, which improves the uniformity of current distribution when the current passes through the second part 22 and reduces the risk of local overheating or excessive current. At the same time, the smaller area of ​​the first part 21 also helps to reduce the amount of material used and lower costs.

[0073] Understandably, the adapter 2 plays a role in connecting the tab 201 and drawing out current in the battery cell 1000, which improves the stability of current transmission and the efficiency of battery performance. At the same time, by optimizing the area of ​​the first part 21 and the second part 22, the safety and reliability of the battery can be further improved.

[0074] In some embodiments, such as Figure 10 and Figure 11 As shown, the first part 21 includes a first segment 211 and a second segment 212 connected together. The outer diameter of the first segment 211 is smaller than the outer diameter of the second segment 212. The first segment 211 has a first connecting segment. The end of the second segment 212 opposite to the first segment 211 is connected to the second part 22.

[0075] In this embodiment, the outer diameters of the first segment 211, the second segment 212, and the second part 22 increase sequentially to form an expanded diameter structure, which facilitates the assembly of the adapter piece 2 and the seal 3.

[0076] It should be noted that, from the first connecting section to the second connecting section, the cross-section of the adapter piece 2 should not be significantly reduced or its cross-sectional shape significantly changed, so as to reduce the impact on the current carrying capacity of the adapter piece 2.

[0077] In some embodiments, the cross-section of the adapter piece 2 is rectangular, and the adapter piece 2 as a whole is a sheet.

[0078] In some embodiments, such as Figure 3 and Figure 4 As shown, the cover plate assembly 100 also includes a seal 3, which is sandwiched between the adapter piece 2 and the clearance hole 111.

[0079] A compressible seal 3 is provided between the adapter piece 2 and the clearance hole 111. The seal 3 is an insulating structure. For example, the seal 3 can be silicone rubber or fluororubber.

[0080] The sealing element 3 is clamped between the adapter piece 2 and the clearance hole 111 in a compressed state, which serves to achieve the effects of insulation and sealing.

[0081] In some embodiments, such as Figure 10 and Figure 11 As shown, the second part 22 is provided with an annular groove 221, which is opposite to the clearance hole 111. The annular groove 221 is used to fix and limit the seal 3.

[0082] At least a portion of the seal 3 is located within the annular groove 221, and part or all of the seal 3 is located within the annular groove 221.

[0083] In this embodiment, after adding the seal 3 to the avoidance hole 111, the size of the avoidance hole 111 is slightly smaller than the cross-sectional size of the adapter piece 2. A circular groove 221 is preset in the second part 22. The circular groove 221 is in close fit with the seal 3 and the circular groove 221 has a certain degree of extrusion effect on the seal 3, further enhancing the insulation and sealing effects.

[0084] In some embodiments, as Figure 10 shown, in the length direction of the adapter piece 2, the length L1 of the circular groove 221 is greater than the length of the seal 3, and the outer diameter of the circular groove 221 is greater than the inner diameter of the seal 3, facilitating the assembly of the seal 3 and the circular groove 221. At the same time, it increases the contact area and tightness between the circular groove 221 and the seal 3. The circular groove 221 has a certain degree of extrusion on the seal 3, and the elasticity of the seal 3 is utilized to maintain a continuous sealing effect.

[0085] In some embodiments, as Figure 10 shown, the adapter piece 2 satisfies: D1 < D3 < D2 ≤ D4, where the thickness of the first section 211 is D1, the thickness of the connection end of the second section 212 and the first section 211 is the same as that of the first section 211, both being D1, the thickness of the connection end of the second section 212 and the second part 22 is D2, the thickness of the circular groove 221 area of the second part 22 is D3, and the thickness of other areas of the second part 22 is D4.

[0086] In some embodiments, as Figure 11 shown, the adapter piece 2 satisfies: W1 < W3 < W2 ≤ W4, where the width of the first section 211 is W1, the width of the connection end of the second section 212 and the second part 22 is W2, the width of the circular groove 221 area of the second part 22 is W3, and the width of other areas of the second part 22 is W4.

[0087] In some embodiments, the target area of the adapter piece 2 electrically connected to the negative electrode for connecting to the tab 201 is made of copper material, and the rest of the area is made of aluminum material to reduce costs.

[0088] In some embodiments, as Figure 4 shown, the seal 3 includes a first seal section 31, a second seal section 32, and a third seal section 33 connected in sequence. The first seal section 31, the second seal section 32, and the third seal section 33 form a groove structure. The second seal section 32 forms the bottom of the groove, and the first seal section 31 and the third seal section 33 form the walls of the groove.

[0089] The second sealing section 32 is disposed between the adapter plate 2 and the clearance hole 111 to achieve the effects of insulation and sealing; the first sealing section 31 and the third sealing section 33 are located on the side wall of the adapter plate 2, and at least a portion of the first sealing section 31 and the third sealing section 33 are located between the annular groove 221 and the side wall of the adapter plate 2 to increase the sealing effect.

[0090] The first sealing section 31, the second sealing section 32, and the third sealing section 33 can be integrally molded or glued together.

[0091] In some embodiments, the seal 3 includes a second sealing section 32 located between the adapter piece 2 and the clearance hole 111, which can also serve as an insulation and sealing effect.

[0092] In some embodiments, the seal 3 includes a second sealing section 32 located between the adapter piece 2 and the clearance hole 111. A first sealing section 31 or a third sealing section 33 is provided on one side of the second sealing section 32, which can also achieve the effects of insulation and sealing.

[0093] In some embodiments, such as Figure 3 and Figure 4 As shown, the cover plate assembly 100 also includes a support assembly 4, which is positioned and engaged with the second part 22.

[0094] The support assembly 4 can be a separate structure or an integrated structure. The support assembly 4 is used to limit the displacement of the adapter piece 2 within the housing 300 of the electrode core 200. The outer diameter of the support assembly 4 should be smaller than the inner diameter of the housing 300 of the battery cell 1000 to facilitate the installation of the support assembly 4 into the housing 300.

[0095] In this embodiment, one of the support component 4 and the second part 22 is provided with a positioning hole, and the other of the support component 4 and the second part 22 is provided with a positioning pin. The support component 4 and the second part 22 are positioned and engaged through the positioning hole and the positioning pin, thereby limiting the displacement of the adapter piece 2.

[0096] In some embodiments, such as Figure 4 , Figure 12 and Figure 13 As shown, the support assembly 4 includes a first support member 41 and a second support member 42. The first support member 41 and the second support member 42 can be symmetrical or have different structures. Setting the support assembly 4 as a separate first support member 41 and second support member 42 facilitates the connection and assembly of the support assembly 4 with the adapter piece 2.

[0097] The first support member 41 and the second support member 42 are connected by means of snap-fit, plug-in connection, threaded connection, etc.

[0098] The first support member 41 and the second support member 42 form a through hole 43. The through hole 43 is aligned with the avoidance hole 111. The through hole 43 is used to avoid the second part 22. The second part 22 passes through the through hole 43 and the avoidance hole 111.

[0099] In some embodiments, such as Figure 4 , Figure 11 and Figure 12 As shown, the following conditions must be met: W5≥W4, D5≥D4; where W5 is the length of the through hole 43, W4 is the length of the widest part of the adapter piece 2, D5 is the height of the through hole 43, and D4 is the thickness of the thickest part of the adapter piece 2.

[0100] In this embodiment, the length and width of the through hole 43 are both greater than or equal to the maximum size of the adapter piece 2, so that the adapter piece 2 can pass smoothly through the through hole 43, and the support component 4 can fix the adapter piece 2.

[0101] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411.

[0102] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421 to form the support assembly 4, which facilitates installation and improves the stability of the connection.

[0103] For example, one of the first connector 411 and the second connector 421 is a plug hole, a groove or other form suitable for receiving a plug, and the other of the first connector 411 and the second connector 421 is a pin, a tenon or other form suitable for a plug.

[0104] For example, the first connector 411 and the second connector 421 include multiple pairs, and the number of pairs of the first connector 411 and the second connector 421 can be two or more. For example, the number of pairs of the first connector 411 and the second connector 421 is greater than or equal to four pairs, so as to increase the stability of the connection between the first support member 41 and the second support member 42.

[0105] In some embodiments, such as Figure 12 and Figure 13 As shown, multiple pairs of first connectors 411 and second connectors 421 are symmetrically distributed to increase the stability of the connection between the first support 41 and the second support 42.

[0106] In some embodiments, such as Figure 12 and Figure 13As shown, the first connector 411 and the second connector 421 include multiple pairs, and the multiple pairs of first connectors 411 and second connectors 421 form multiple first connection groups and multiple second connection groups. In the first connection group, the first connector 411 is a plug hole and the second connector 421 is a pin. In the second connection group, the first connector 411 is a pin and the second connector 421 is a plug hole. The first connection groups and the second connection groups are arranged alternately, thereby further increasing the stability of the connection between the first support member 41 and the second support member 42.

[0107] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged.

[0108] In this embodiment, the first support member 41 and the second support member 42 form a through hole 43, which is used for the adapter to pass through. The through hole 43 and the second part 22 are positioned and engaged by the first plug and the second plug 222, which makes assembly convenient, positioning accurate and connection stable.

[0109] For example, one of the first connector and the second connector 222 is a socket, groove or other form suitable for receiving a connector, and the other of the first connector and the second connector 222 is a pin, tenon or other form suitable for a connector.

[0110] For example, multiple pairs of first and second connectors 222 can be provided, with multiple first connectors symmetrically distributed on the support component 4, and correspondingly, multiple second connectors 222 symmetrically distributed on the second part 22.

[0111] In some embodiments, when the first connector 411 or the second connector 421 is a pin, the first plug is a part of the first connector 411 or the second connector 421, and the second plug 222 of the second part 22 is a plug hole structure, and the first connector 411 and the second connector 421 pass through the second plug 222 when assembled.

[0112] The aforementioned pins all include a guide surface and a locking surface. The guide surface of the pin is used to guide the pin through the locking hole, and the locking surface is used to engage with the locking hole to reduce the possibility of the pin falling out of the locking hole.

[0113] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with multiple weight reduction holes 45. The weight reduction holes 45 can reduce the weight of the support component 4, which is beneficial to the lightweight design of the battery cell 1000 and facilitates liquid injection.

[0114] The weight-reduction holes 45 are designed in a circular, elliptical, or oblong shape to maximize weight reduction without sacrificing structural strength. The diameter of the weight-reduction holes 45 can be determined based on the structural analysis results of the support component 4 to improve the weight-reduction effect and structural safety.

[0115] Multiple weight-reducing holes 45 can be spaced apart along the extension direction of the support component 4 to improve the uniformity of weight distribution and reduce local stress concentration.

[0116] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 and the second support member 42 are provided with a relief groove 44 at one end away from the cover plate body 11. The relief groove 44 is used to avoid the electrode tab 201 so that the electrode tab 201 can be smoothly connected to the second connecting section of the adapter piece 2 in the relief groove 44.

[0117] The shape and size of the clearance groove 44 are designed according to the size and shape of the tab 201 to avoid squeezing the tab 201 and to allow the tab 201 to be installed smoothly and maintain good electrical contact with the adapter plate 2.

[0118] In some embodiments, the area where the tab 201 is connected to the adapter piece 2 is located within the relief groove 44 of the support component 4, and the support component 4 protects and fixes the area where the tab 201 is connected to the adapter piece 2.

[0119] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411; the support assembly 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector, and the first connector and the second connector 222 are positioned and engaged; the first support member 41 and the second support member 42 are provided with a relief groove 44 at one end away from the cover plate body 11, and the relief groove 44 is used to avoid the electrode tab 201; the support assembly 4 is provided with a plurality of weight reduction holes 45, and the plurality of weight reduction holes 45 are spaced apart along the extension direction of the support assembly 4.

[0120] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection. The second connector 222 of the second part 22 has a plug hole structure. When the first connector 411 and the second connector 421 are assembled, they will pass through the second connector 222 to fix the first support member 41, the adapter piece 2 and the second support member 42 at the same time, which facilitates the assembly and fixation of the three and improves the stability of the connection. The weight reduction hole 45 can reduce the weight of the support assembly 4, which is conducive to the lightweight design of the battery cell 1000. The clearance groove 44 can allow the tab 201 to be installed smoothly and maintain good electrical contact with the adapter piece 2.

[0121] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged. The first support member 41 and the second support member 42 are provided with a relief groove 44 at the end opposite to the cover plate body 11. The relief groove 44 is used to avoid the electrode tab 201. The support component 4 is provided with a plurality of weight reduction holes 45, which are spaced apart along the extension direction of the support component 4.

[0122] In this embodiment, the second part 22 is positioned and engaged with the support component 4 through the first connector and the second connector 222, which facilitates the fixing and assembly of the adapter piece 2; the weight reduction hole 45 can reduce the weight of the support component 4, which is conducive to the lightweight design of the battery cell 1000; the clearance groove 44 can allow the tab 201 to be installed smoothly and maintain good electrical contact with the adapter piece 2.

[0123] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411; the first support member 41 and the second support member 42 are provided with a relief groove 44 at the end opposite to the cover plate body 11, the relief groove 44 is used to avoid the electrode tab 201; the support assembly 4 is provided with a plurality of weight reduction holes 45, the plurality of weight reduction holes 45 are spaced apart along the extension direction of the support assembly 4.

[0124] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection; the weight reduction hole 45 can reduce the weight of the support assembly 4, which is conducive to the lightweight design of the battery cell 1000; the clearance groove 44 can make the tab 201 easy to install and maintain good electrical contact with the adapter 2.

[0125] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged. The first support component 41 is provided with a first connector 411, and the second support component 42 is provided with a second connector 421 that is inserted into the first connector 411. The support component 4 is provided with a plurality of weight-reducing holes 45, which are spaced apart along the extension direction of the support component 4.

[0126] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection. The second connector 222 of the second part 22 has a plug hole structure. When the first connector 411 and the second connector 421 are assembled, they will pass through the second connector 222 to fix the first support member 41, the adapter piece 2 and the second support member 42 at the same time, which facilitates the assembly and fixation of the three and improves the stability of the connection. The setting of the weight reduction hole 45 can reduce the weight of the support assembly 4, which is conducive to achieving the lightweight setting of the battery cell 1000.

[0127] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411; the support assembly 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector, and the first connector and the second connector 222 are positioned and engaged; the first support member 41 and the second support member 42 are provided with a relief groove 44 at one end away from the cover plate body 11, and the relief groove 44 is used to avoid the electrode tab 201.

[0128] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection. The second connector 222 of the second part 22 has a plug hole structure. When the first connector 411 and the second connector 421 are assembled, they will pass through the second connector 222 to fix the first support member 41, the adapter piece 2 and the second support member 42 at the same time, which facilitates the assembly and fixation of the three and improves the stability of the connection. The clearance groove 44 allows the tab 201 to be installed smoothly and maintain good electrical contact with the adapter piece 2.

[0129] In some embodiments, such as Figure 12 and Figure 13As shown, the first support member 41 and the second support member 42 are provided with a relief groove 44 at one end away from the cover plate body 11. The relief groove 44 is used to avoid the electrode tab 201. The support assembly 4 is provided with a plurality of weight reduction holes 45, which are spaced apart along the extension direction of the support assembly 4.

[0130] In this embodiment, the weight reduction hole 45 can reduce the weight of the support component 4, which is beneficial to achieving a lightweight design of the battery cell 1000; the clearance groove 44 can allow the tab 201 to be installed smoothly and maintain good electrical contact with the adapter 2.

[0131] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411; the support assembly 4 is provided with a plurality of weight-reducing holes 45, which are spaced apart along the extension direction of the support assembly 4.

[0132] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection; the weight reduction hole 45 can reduce the weight of the support assembly 4, which is conducive to achieving a lightweight design of the battery cell 1000.

[0133] In some embodiments, such as Figure 12 and Figure 13 As shown, the first support member 41 is provided with a first connector 411, and the second support member 42 is provided with a second connector 421 that is inserted into the first connector 411; the first support member 41 and the second support member 42 are provided with a relief groove 44 at the end opposite to the cover plate body 11, and the relief groove 44 is used to avoid the electrode tab 201.

[0134] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection; the clearance groove 44 allows the electrode tab 201 to be installed smoothly and maintain good electrical contact with the adapter piece 2.

[0135] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged. The support component 4 is provided with a plurality of weight-reducing holes 45, which are spaced apart along the extension direction of the support component 4.

[0136] In this embodiment, the second part 22 is positioned and engaged with the support component 4 through the first connector and the second connector 222, which facilitates the fixing and assembly of the adapter piece 2; the weight reduction hole 45 can reduce the weight of the support component 4, which is conducive to achieving a lightweight design of the battery cell 1000.

[0137] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged. The first support component 41 and the second support component 42 are provided with a relief groove 44 at one end away from the cover plate body 11. The relief groove 44 is used to avoid the electrode tab 201.

[0138] In this embodiment, the second part 22 is positioned and engaged with the support component 4 through the first connector and the second connector 222, which facilitates the fixing and assembly of the adapter piece 2; the setting of the clearance groove 44 allows the electrode tab 201 to be installed smoothly and maintain good electrical contact with the adapter piece 2.

[0139] In some embodiments, such as Figure 12 and Figure 13 As shown, the support component 4 is provided with a first connector, and the second part 22 is provided with a second connector 222 that is inserted into the first connector. The first connector and the second connector 222 are positioned and engaged. The first support component 41 is provided with a first connector 411, and the second support component 42 is provided with a second connector 421 that is inserted into the first connector 411.

[0140] In this embodiment, the first support member 41 and the second support member 42 are connected by the first connector 411 and the second connector 421, which facilitates installation and improves the stability of the connection. The second connector 222 of the second part 22 has a plug hole structure. When the first connector 411 and the second connector 421 are assembled, they will pass through the second connector 222 to fix the first support member 41, the adapter piece 2 and the second support member 42 at the same time, which facilitates the assembly and fixation of the three and improves the stability of the connection.

[0141] In some embodiments, such as Figure 5 and Figure 9 As shown, the cover plate body 11 has an injection hole 112.

[0142] The injection hole 112 is a potting structure. After the battery cell 1000 is installed, it is potted with potting compound to enhance the sealing and heat dissipation effect of the end of the electrode core 200.

[0143] like Figure 3 , Figure 4 and Figure 5As shown, the cover plate assembly 100 also includes an adhesive limiting mechanism 5. The adhesive limiting mechanism 5 is disposed on the side of the cover plate body 11 facing the movement. The adhesive limiting mechanism 5 has a ring-shaped structure and surrounds the outer side of the adapter piece 2. The adhesive limiting mechanism 5 and the outer side of the adapter piece 2 are spaced apart to form an adhesive injection channel. The adhesive injection hole 112 communicates with the adhesive injection channel. This improves the sealing of the adhesive and the heat dissipation effect of the adapter piece 2, while also increasing the amount of adhesive injected.

[0144] The glue limiting mechanism 5 is adapted to be disposed between the cover plate body 11 and the support assembly 4.

[0145] like Figure 6 As shown, one end of the glue limiting mechanism 5 is in close contact with the cover plate body 11, and the contact surface between the cover plate body 11 and the glue limiting mechanism 5 is sealed to prevent glue from flowing out from the contact surface; the other end of the glue limiting mechanism 5 is in contact with the support component 4, and the glue limiting mechanism 5 plays a fixing role on the support component 4, limiting the displacement of the support component 4 in the length direction.

[0146] The two ends of the glue-limiting mechanism 5 can be connected to the cover plate body 11 and the support component 4 by means of welding, mechanical connection or adhesive.

[0147] For example, the glue-restricting mechanism 5 can be made of metal, ceramic, or plastic.

[0148] Among them, such as Figure 5 and Figure 9 As shown, the cover plate body 11 is provided with an explosion-proof valve 113. With the length direction of the adapter piece 2 as the projection direction, the explosion-proof valve 113 is surrounded by the projection of the glue limiting mechanism 5.

[0149] In this embodiment, by setting the glue limiting mechanism 5, when the glue injection and potting process is performed after the electrode core 200 is installed, the glue limiting mechanism 5 can limit the distribution area of ​​the glue, reduce the risk of glue blocking the liquid injection passage and explosion-proof vent passage of the electrode core 200, and also increase the coverage rate of the potting glue on the contact area of ​​the adapter 2, the cover plate body 11 and the sealing element 3, thereby improving the sealing effect and heat dissipation effect of the area.

[0150] In some embodiments, such as Figure 5 and Figure 9 As shown, the cover plate body 11 is also provided with a liquid injection hole 114, which is used to inject liquid after the glue has solidified.

[0151] The injection hole 112 is located within the surrounding area of ​​the glue limiting mechanism 5, while the injection hole 114 is located outside the surrounding area of ​​the glue limiting mechanism 5.

[0152] It should be noted that, as Figure 2As shown, for a battery cell 1000 with positive and negative electrode cover plate assemblies 100, the glue injection hole 112 and the explosion-proof valve 113 can be placed on the cover plate body 11 of either cover plate assembly 100. The glue injection hole does not affect the design of the explosion-proof valve 113 and the cover plate body 11. That is, both cover plate assemblies 100 of battery cells 1000 with positive and negative electrodes on both sides can have designs such as glue injection holes, sealing elements 3, glue limiting mechanisms 5, and support components 4; Figure 2 As shown, for a battery cell 1000 with both positive and negative electrodes on one side (such as a square-shell electrode core), the battery cell 1000 includes only one cover assembly 100, and an adhesive limiting mechanism 5 can be set to simultaneously surround the positive and negative electrode adapter pieces 2.

[0153] The specific installation steps of the battery cell 1000 provided in this application embodiment are as follows: First, connect the copper and aluminum parts of the negative electrode adapter 2 together. Then, connect the electrode tab 201 to one end of the adapter 2. Install the support assembly 4 and the adapter 2 together and place them in the housing 300 of the battery cell 1000. The cover plate body 11 has a clearance hole 111. Install the sealing element 3 in the clearance hole 111. Install the glue limiting mechanism 5 on the side of the cover plate body 11 near the electrode core 200. Then, install the cover plate assembly 100 and the housing 300 of the electrode core 200. The adapter 2 passes through the sealing element 3 in the clearance hole 111 and extends out of the cover plate body 11, connecting the cover plate assembly 100 and the housing 300. Inject the potting compound into the glue limiting mechanism 5 through the glue injection hole on the cover plate body 11. After the glue is cured, perform the liquid injection and other processes. The entire battery cell 1000 is manufactured.

[0154] This application also provides a battery cell 1000, such as... Figure 1 As shown, it includes: a housing 300, an electrode core 200, and a cover plate assembly 100 as described in any of the above embodiments.

[0155] The electrode core 200 is provided with tabs 201, which are the parts of the battery cell 1000 used to connect to the external circuit, and are usually located at the positive and negative ends of the electrode core 200.

[0156] The cover plate body 11 of the cover plate assembly 100 and the housing 300 form a receiving cavity, the pole core 200 is disposed in the receiving cavity, and the adapter piece 2 of the cover plate assembly 100 is connected to the pole tab 201.

[0157] The electrode tab 201 includes two types: positive and negative. The adapter piece 2 can also be divided into two types: positive and negative. The positive and negative adapter pieces 2 are electrically connected to the positive and negative electrode tabs 201 in a one-to-one correspondence. The positive and negative adapter pieces 2 are the same size.

[0158] It should be noted that the pole core 200 can be a slender blade pole core 200, or in practical applications, it can be a pole core 200 of other sizes, such as a square-shell pole core 200 with similar length and width.

[0159] According to the battery cell 1000 provided in the embodiments of this application, a cover plate assembly 100 of any of the above embodiments is provided. The cover plate assembly 100 is provided with a cover plate body 11 and an adapter piece 2. The adapter piece 2 is an integral structure and is inserted into the clearance hole 111 of the cover plate body 11. The adapter piece 2 is connected to the electrode tab 201 and the adapter piece 2 respectively. Compared with the electrode post formed by splicing multiple segments in the related technology, the structure of the electrode post is simplified and the production cost is reduced, thereby simplifying the structure of the battery cell 1000 and improving the current carrying capacity of the current carrying components such as the adapter piece 2, thereby improving the high temperature resistance and high current performance of the battery cell 1000.

[0160] The specific manufacturing process of the aforementioned battery cell 1000 is as follows: First, the produced electrode core 200 and the electrode tab 201 of the electrode core 200 are connected to the adapter piece 2 by welding or other means. Then, the support assembly 4 is connected to the adapter piece 2 and placed in the housing 300 to form the first assembly. The cover plate body 11 is equipped with a sealing element 3 and an adhesive limiting mechanism 5 to form the second assembly. Then, the first and second assemblies are assembled as a whole, that is, the adapter piece 2 and the sealing element 3 are installed together to form a whole. Then, the cover plate body 11 and the housing 300 are connected by welding or other means, and the battery cell 1000 is installed. Subsequently, adhesive is injected into the adhesive limiting mechanism 5 in the direction of anti-gravity through the pre-made adhesive injection hole on the cover plate body 11. Due to the anti-gravity direction of adhesive injection, the adhesive will not overflow from the weight reduction hole or insertion hole of the support assembly 4. The adhesive injection hole is sealed and the adhesive is allowed to cure. Finally, liquid injection and other processes are performed. Thus, the battery cell 1000 is manufactured.

[0161] It should be noted that, as Figure 7 As shown, for a battery cell 1000 with end cap assemblies 100, the adhesive at one end needs to be cured before the adhesive at the other end is applied. After the battery cell 1000 is manufactured, the positive and negative electrodes of adjacent battery cells 1000 are connected by connecting pieces 400 between battery cells 1000 to achieve the purpose of assembling battery cells 1000 into a group.

[0162] This example is a blade pole core 200 with end caps, but it is also applicable to pole cores 200 with a single end cap (such as square pole cores 200).

[0163] In some embodiments, the tab 201 is connected to the adapter piece 2 by lap welding, and the area where the tab 201 is welded to the adapter piece 2 is located between the first support member 41 and the second support member 42 of the cover plate assembly 100.

[0164] The electrode tab 201 and the adapter piece 2 can be connected by welding methods such as lap welding, for example, laser welding or ultrasonic welding. Welding the electrical connection between the electrode tab 201 and the adapter piece 2 improves the connection effect, increases the reliability of the connection, and reduces the connection resistance.

[0165] In some embodiments, the electrode core 200 includes two electrodes arranged side by side, and the two tabs 201 of the two electrodes 200 are respectively connected to the two sides of the adapter plate 2.

[0166] Both tabs 201 can be connected to the two sides of the adapter piece 2 by lap welding.

[0167] This application also provides a battery module, such as... Figure 1 As shown, it includes a connecting piece 400 and at least two battery cells 1000 as described in any of the above embodiments, with the adapter pieces 2 of two adjacent battery cells 1000 connected by the connecting piece 400.

[0168] In this embodiment, the adapter 2 between different battery cells 1000 is connected by the connecting piece 400 to realize the electrical connection between the battery cells 1000, forming a battery module and a battery pack.

[0169] The connecting piece 400 between battery cells 1000 and the adapter piece 2 of the positive and negative terminals of battery cells 1000 can be connected by lap welding.

[0170] In some embodiments, the battery module further includes a tray on which at least two battery cells 1000 are disposed.

[0171] This application also provides a battery pack, including a battery module as described in any of the above embodiments.

[0172] According to the battery pack provided in the embodiments of this application, a battery module of any of the above embodiments is provided. The battery module has a cover plate assembly 100 of any of the above embodiments. The cover plate assembly 100 is provided with a cover plate body 11 and an adapter piece 2. The adapter piece 2 is an integral structure and is inserted into the clearance hole 111 of the cover plate body 11. The adapter piece 2 is connected to the electrode tab 201 and the adapter piece 2 respectively. Compared with the electrode post formed by splicing multiple segments in the related technology, the structure of the electrode post is simplified and the production cost is reduced, thereby simplifying the structure of the battery cell 1000 and improving the current carrying capacity of the current carrying components such as the adapter piece 2, thereby improving the high temperature resistance and high current performance of the battery cell 1000.

[0173] This application also provides an electrical device, including a battery module as described in any of the above embodiments.

[0174] According to the electrical equipment provided in the embodiments of this application, a battery module of any of the above embodiments is provided. The battery module has a cover plate assembly 100 of any of the above embodiments. The cover plate assembly 100 is provided with a cover plate body 11 and an adapter piece 2. The adapter piece 2 is an integral structure and is inserted into the clearance hole 111 of the cover plate body 11. The adapter piece 2 is connected to the electrode tab 201 and the adapter piece 2 respectively. Compared with the electrode post formed by splicing multiple segments in the related technology, the structure of the electrode post is simplified and the production cost is reduced, thereby simplifying the structure of the battery cell 1000 and improving the current carrying capacity of the current carrying components such as the adapter piece 2, thereby improving the high temperature resistance and high current performance of the battery cell 1000.

[0175] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0176] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0177] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0178] In the description of this application, "multiple" means two or more.

[0179] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0180] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0181] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0182] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate body has clearance holes. An adapter piece is provided through the clearance hole. The portion of the adapter piece located on one side of the cover plate body is used to connect with the tab of the electrode core, and the portion of the adapter piece located on the other side of the cover plate body is used to connect with the adapter piece of the adjacent battery cell. The adapter plate includes a first part and a second part connected in sequence. The first part has a first connecting section that connects to the adapter plate of an adjacent battery cell, and the second part has a second connecting section for connecting to the tab of the electrode core. The outer diameter of the first part is smaller than the outer diameter of the second part. A support component, which is positioned and engaged with the second part, is used to limit the displacement of the adapter piece; The cover plate body is provided with an injection hole; The cover plate assembly further includes an adhesive limiting mechanism adapted to be disposed between the cover plate body and the support assembly. The adhesive limiting mechanism surrounds the outer side of the adapter piece and is spaced apart from the outer side of the adapter piece to form an adhesive injection channel. The adhesive injection hole communicates with the adhesive injection channel.

2. The cover plate assembly according to claim 1, characterized in that, The first part includes a first segment and a second segment connected together. The outer diameter of the first segment is smaller than the outer diameter of the second segment. The first segment has the first connecting segment. The end of the second segment opposite to the first segment is connected to the second part.

3. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly further includes a seal, which is sandwiched between the adapter piece and the clearance hole.

4. The cover plate assembly according to claim 3, characterized in that, The second part is provided with an annular groove, which is disposed opposite to the clearance hole, and at least a portion of the seal is located within the annular groove.

5. The cover plate assembly according to claim 3, characterized in that, The sealing element includes a first sealing section, a second sealing section, and a third sealing section connected in sequence. The second sealing section is located between the adapter plate and the clearance hole, and the first sealing section and the third sealing section are located on the side wall of the adapter plate.

6. The cover plate assembly according to claim 5, characterized in that, The support assembly includes a first support member and a second support member, the first support member and the second support member are connected, the first support member and the second support member surround to form a through hole, and the second part passes through the through hole and the avoidance hole.

7. The cover plate assembly according to claim 6, characterized in that, The first support member is provided with a first connector, and the second support member is provided with a second connector that plugs into the first connector; and / or, The support component is provided with a first connector, and the second part is provided with a second connector that plugs into the first connector, wherein the first connector and the second connector are positioned and engaged; and / or, The first support member and the second support member have clearance grooves at their ends opposite to the cover plate body, the clearance grooves being used to avoid the electrode tabs; and / or, The support component is provided with a plurality of weight-reducing holes, which are spaced apart along the extension direction of the support component.

8. A single battery cell, characterized in that, include: case; The electrode core is provided with electrode tabs; The cover plate assembly as described in any one of claims 1-7, wherein the cover plate body of the cover plate assembly and the housing form a receiving cavity, the electrode core is disposed in the receiving cavity, and the adapter piece of the cover plate assembly is connected to the electrode tab.

9. The battery cell according to claim 8, characterized in that, The electrode tab is connected to the adapter piece by lap welding, and the area where the electrode tab is welded to the adapter piece is located between the first support and the second support of the cover plate assembly.

10. The battery cell according to claim 9, characterized in that, The electrode core includes two electrodes, and the two tabs of the two electrodes are respectively connected to the two sides of the adapter piece by lap welding.

11. A battery module, characterized in that, It includes a connecting piece and at least two battery cells as described in any one of claims 8-10, wherein the connecting pieces of two adjacent battery cells are connected by the adapter piece.

12. The battery module according to claim 11, characterized in that, The battery module also includes a tray, on which at least two of the battery cells are disposed.

13. A battery pack, characterized in that, This includes the battery module as described in claim 11 or 12.

14. An electrical appliance, characterized in that, Includes the battery module as described in claim 11 or 12.

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