Connecting assembly, cover plate assembly and battery

Abstract

The utility model provides a connecting assembly, a cover plate assembly and a battery, and relates to the technical field of batteries. The connecting assembly comprises a bottom plate and a connecting piece. The first connecting part of the connecting piece is arranged in the mounting groove so that the connecting piece can be fixed to the bottom plate, and the second connecting part can be electrically connected with the bottom plate through the first connecting part. The second connecting part can be used for being connected with a pole, and the bottom plate can be used for being connected with a tab of an electrode assembly, so that the electrode assembly can be electrically connected with the pole through the bottom plate and the connecting piece. The connecting sleeve is arranged on the second connecting part in a sleeving mode so that the connecting sleeve can make contact with and be fixed to the second connecting part, the bottom plate supports the connecting sleeve so that the connecting sleeve can also make contact with the bottom plate, in this way, in the connecting piece, the first connecting part can make contact with the bottom plate, and the connecting sleeve can also make contact with the bottom plate, so that the contact area of the connecting piece and the bottom plate is larger; and the connecting assembly has better over-current capability.

Description

Technical Field

[0001] The present application relates to a connection assembly, a cover assembly and a battery, belonging to the technical field of battery modules. Background Art

[0002] In a battery module, the tabs of a single electrode assembly need to be electrically connected to the pole through an adapter, so as to be conductively connected to external connectors such as the busbar through the pole. Therefore, the performance parameters of the adapter affect the electrical connection effect between the electrode assembly and the pole.

[0003] Currently, the main problem with the adapter in the battery module is weak overcurrent capability, which leads to poor power release performance of the battery module. Utility Model Content

[0004] The present application provides a connection assembly, a cover assembly and a battery module, which solve the problem of low current capacity of the adapter in the related art.

[0005] The present application provides a connection assembly, comprising:

[0006] The bottom plate is provided with a mounting slot;

[0007] The connecting member includes a first connecting part, a second connecting part and a connecting sleeve, the first connecting part and the second connecting part are connected, the first connecting part is embedded in the installation groove, the second connecting part is located outside the installation groove, the connecting sleeve is sleeved on the second connecting part, and the base plate supports the connecting sleeve.

[0008] In some embodiments, the outer peripheral edge of the connecting sleeve is welded to the bottom plate.

[0009] In some embodiments, the outer diameter of the connecting sleeve is greater than the outer diameter of the second connecting portion.

[0010] In some embodiments, the outer diameter of the second connecting portion is greater than the outer diameter of the first connecting portion.

[0011] In some embodiments, the outer diameter of the second connecting portion gradually decreases in a direction away from the first connecting portion.

[0012] In some embodiments, the mounting groove passes through the bottom plate, and an end surface of the first connecting portion facing away from the second connecting portion is flush with a side opening of the mounting groove.

[0013] In some embodiments, a side of the bottom plate facing away from the second connecting portion has a reinforcement protrusion, and the reinforcement protrusion is arranged in a direction away from the second connecting portion.

[0014] In some embodiments, the bottom plate has an inner groove on a side facing away from the reinforcing protrusion, and the inner groove is opposite to the reinforcing protrusion.

[0015] Based on the above connection assembly, the present application further proposes a cover assembly, comprising a substrate, a pole and the above connection assembly, wherein the connection assembly is located on one side of the substrate, and the pole passes through the substrate and is connected to the second connection portion.

[0016] Based on the above cover assembly, the present application also proposes a battery, comprising a shell, an electrode assembly and the above cover assembly, the shell having a cavity and an opening connected to the cavity, the electrode assembly being arranged in the cavity, the substrate sealing the opening, and the bottom plate being electrically connected to the electrode assembly.

[0017] In the connection assembly provided by the present application, the first connection portion of the connector is arranged in the mounting groove, so that the connector can be fixed to the base plate, and the second connection portion can be electrically connected to the base plate through the first connection portion. The second connection portion can be used to connect to the pole, and the base plate can be used to connect to the pole ear of the electrode assembly, so that the electrode assembly can be electrically connected to the pole through the base plate and the connector. The connecting sleeve is arranged on the second connection portion so that the connecting sleeve contacts and is fixed to the second connection portion, and the base plate supports the connecting sleeve so that the connecting sleeve is also in contact and connected with the base plate. In this way, not only the first connection portion of the connector contacts and is connected to the base plate, but the connecting sleeve is also in contact and connected with the base plate, thereby making the contact area between the connector and the base plate larger and the connection assembly having better current capacity.

[0018] In the cover plate assembly proposed in the present application, since it includes the above-mentioned connection assembly, the cover plate assembly also has good flow capacity.

[0019] The battery proposed in this application includes the above-mentioned cover assembly, so the battery has better energy release performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the embodiments of the present application will become more readily understood through the following detailed description with reference to the accompanying drawings, in which various embodiments of the present application are illustrated by way of example and not limitation, wherein:

[0021] Figure 1 A schematic diagram of a connection assembly according to an embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the bottom side of a connection assembly according to an embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the internal structure of the connection component of an embodiment of the present application;

[0024] Figure 4A schematic diagram of a battery according to an embodiment of the present application;

[0025] Figure 5 for Figure 4 Schematic cross-section of the middle AA;

[0026] Figure 6 for Figure 5 A schematic diagram showing an enlarged view of area B in the middle;

[0027] Figure 7 A schematic diagram of a cover assembly according to an embodiment of the present application;

[0028] Figure 8 This is an exploded view of the cover assembly of an embodiment of the present application.

[0029] Reference numerals:

[0030] 100-base plate, 110-installation groove, 120-reinforcement protrusion, 130-inner groove,

[0031] 200-connecting piece, 210-first connecting part, 220-second connecting part, 230-connecting sleeve,

[0032] 300-substrate, 310-upper plastic, 320-lower plastic, 330-sealing ring,

[0033] 400-pole,

[0034] 500-shell,

[0035] 600-Electrode Assembly. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0042] In a battery module, the tabs of a single electrode assembly need to be electrically connected to the pole through an adapter, so as to be conductively connected to external connectors such as the busbar through the pole. Therefore, the performance parameters of the adapter affect the electrical connection effect between the electrode assembly and the pole.

[0043] Currently, the main problem with the adapter in the battery module is weak overcurrent capability, which leads to poor power release performance of the battery module.

[0044] In the connection assembly proposed in the present application, the first connection portion of the connector is arranged in the mounting groove, so that the connector can be fixed to the base plate, and the second connection portion can be electrically connected to the base plate through the first connection portion. The second connection portion can be used to connect to the pole, and the base plate can be used to connect to the pole ear of the electrode assembly, so that the electrode assembly can be electrically connected to the pole through the base plate and the connector. The connecting sleeve is arranged on the second connection portion so that the connecting sleeve contacts and is fixed to the second connection portion, and the base plate supports the connecting sleeve so that the connecting sleeve is also in contact and connected with the base plate. In this way, not only the first connection portion of the connector contacts and is connected to the base plate, but the connecting sleeve is also in contact and connected with the base plate, thereby making the contact area between the connector and the base plate larger and the connection assembly having better current capacity.

[0045] In the cover plate assembly proposed in the present application, since it includes the above-mentioned connection assembly, the cover plate assembly also has good flow capacity.

[0046] The battery proposed in this application includes the above-mentioned cover assembly, so the battery has better energy release performance.

[0047] The connection assembly, cover assembly and battery provided in this application are described in detail below with reference to specific embodiments.

[0048] This application proposes a connection component, referring to Figures 1 to 3 As shown, it includes a bottom plate 100 and a connector 200. The connecting assembly can be used in a battery, and the connector 200 can be used to electrically connect the electrode assembly 600 with the pole 400.

[0049] The base plate 100 is the foundational component of the connector assembly of this application. It provides a mounting base for at least some of the other components of the connector assembly and serves to protect at least some of the other components. The base plate 100 can be made of a metal material, which allows for electrical conductivity and provides superior structural strength, thereby enhancing durability and reliability.

[0050] The connector 200 includes a first connector portion 210, a second connector portion 220, and a connector sleeve 230. The first connector portion 210 is connected to the second connector portion 220. The connector 200 is also made of metal, making it conductive. A mounting groove 110 is defined on the base plate 100. The first connector portion 210 is embedded within the mounting groove 110, allowing the first connector portion 210 to contact and securely connect with the base plate 100. This allows the second connector portion 220 to be secured to the base plate 100 via the first connector portion 210, and the second connector portion 220 to be electrically connected to the base plate 100 via the first connector portion 210. When the connector assembly of the present application is used in a battery, the base plate 100 can be electrically connected to the tab of the electrode assembly 600, and the second connector portion 220 can be connected to the electrode post 400, thereby electrically connecting the electrode assembly 600 to the electrode post 400 via the connector assembly of the present application.

[0051] The second connection portion 220 is located outside the mounting groove 110 of the base plate 100, and the connection sleeve 230 is sleeved on the second connection portion 220, so that the connection sleeve 230 is also located outside the cavity of the base plate 100. The connection sleeve 230 is located on the base plate 100, so that the base plate 100 supports the connection sleeve 230, so that the side of the connection sleeve 230 facing the base plate 100 can contact the plate surface of the base plate 100. As a result, not only the first connection portion 210 of the connector 200 can contact and connect with the base plate 100, but the connection sleeve 230 can also contact and connect with the base plate 100, which can increase the contact area between the connector 200 and the base plate 100, making the current transmission from the base plate 100 to the connector 200 more efficient, thereby making the connection assembly of the present application have better current flow capacity.

[0052] In addition, the connection and contact between the connecting sleeve 230 and the base plate 100 can also make the connection parts of the connecting member 200 and the base plate 100 more, so that the connection reliability of the connecting member 200 and the base plate 100 is better, so as to avoid the connecting member 200 from being easily separated from the base plate 100, thereby making the structure of the connection component of the present application more stable and reliable.

[0053] When the electrical connection assembly of the present application is applied to a battery, the base plate 100 is electrically connected to the electrode assembly 600, and the connector 200 is electrically connected to the pole 400. Since the connection assembly has enhanced current flow capacity, the current can be conducted more efficiently between the electrode assembly 600 and the pole 400, thereby making the battery have better charge and discharge performance.

[0054] In some embodiments, reference Figures 1 to 3As shown, in the present application, the outer edge of the connecting sleeve 230 is connected to the base plate 100 by welding, which can ensure a reliable connection between the connecting sleeve 230 and the base plate 100, and make the electrical connection between the connecting sleeve 230 and the base plate 100 more stable and reliable. Specifically, because the connecting sleeve 230 is sleeved on the second connecting portion 220, the outer diameter of the connecting sleeve 230 is larger than the outer diameter of the portion of the second connecting portion 220 on which the connecting sleeve 230 is sleeved. This allows for a longer welding path when the connecting sleeve 230 is welded to the base plate 100. Accordingly, the range of the connection portion between the connecting sleeve 230 and the base plate 100 is larger, resulting in a better connection effect between the connecting sleeve 230 and the base plate 100.

[0055] In some embodiments, reference Figures 1 to 3 As shown, the outer diameter of the connecting sleeve 230 of the present application can be set to be larger than the outer diameter of the second connecting portion 220. This not only allows the connecting sleeve 230 to be sleeved on the second connecting portion 220, but also makes the structure of the second connecting portion 220 relatively more compact. Specifically, the outer diameter of each portion of the second connecting portion 220 along its length is smaller than the outer diameter of the connecting sleeve 230. This makes the size and structure of the second connecting portion 220 in its radial direction more compact, thereby reducing the material used in the preparation of the second connecting portion 220, and further reducing the material used in the preparation of the connector 200, making the preparation cost of the connection assembly of the present application lower.

[0056] In addition, the outer diameter of each part of the second connecting part 220 in its length direction is smaller than the outer diameter of the connecting sleeve 230, which can make the structure of the second connecting part 220 more compact and occupy less space, so that the structure of the battery using the connecting component of the present application can also be more compact.

[0057] In some embodiments, reference Figures 1 to 3 As shown, the outer diameter of the second connecting portion 220 of the present application is larger than the outer diameter of the first connecting portion 210. This allows the outer diameter of the first connecting portion 210 to be relatively smaller. Accordingly, the inner diameter of the mounting groove 110 on the base plate 100 can also be set to be smaller to match the outer diameter of the first connecting portion 210, thereby reducing the slot size of the base plate 100 and improving the structural strength of the base plate 100. This reduces the material used for the first connecting portion 210, reduces the production cost of the connector 200, and further reduces the production cost of the connection assembly of the present application.

[0058] In addition, the mounting groove 110 of the base plate 100 in the present application can be formed on the base plate 100 through a grooving process. Accordingly, a smaller inner diameter of the mounting groove 110 can make the process of opening the mounting groove 110 on the base plate 100 simpler and can also reduce waste.

[0059] In some embodiments, reference Figures 1 to 3As shown, the outer diameter of the second connecting portion 220 gradually decreases as it moves away from the first connecting portion 210, thereby further compacting the structural dimensions of the second connecting portion 220 and the structural dimensions of the connection assembly of the present application. Specifically, the second connecting portion 220 has a frustum-shaped structure, so that the end surface of the second connecting portion 220 facing away from the first connecting portion 210 is flat. The terminal 400 can contact the end surface of the second connecting portion 220 facing away from the first connecting portion 210, thereby achieving a more stable and reliable contact connection between the second connecting portion 220 and the terminal 400.

[0060] In addition, as the second connecting portion 220 moves away from the first connecting portion 210, the outer diameter of the second connecting portion 220 gradually decreases, which can further reduce the material used in preparing the connecting member 200, thereby further reducing the preparation cost of the connecting assembly of the present application.

[0061] In some embodiments, reference Figures 1 to 3 As shown, the mounting groove 110 of the base plate 100 in the present application is a through groove that passes through the base plate 100. This makes the process of forming the mounting groove 110 on the base plate 100 much simpler, thereby reducing the difficulty of the manufacturing process of the connection assembly of the present application. The end surface of the first connection portion 210 facing away from the second connection portion 220 can be set to be flush with the notch on one side of the mounting groove 110, specifically, flush with the opening on the side of the mounting groove 110 away from the second connection portion 220. In this way, the first connection portion 210 does not protrude outside the mounting groove 110, so that the first connection portion 210 is entirely located within the mounting groove 110, thereby making the first connection portion 210 not occupy the space outside the mounting groove 110 of the base plate 100, thereby making the structure of the connection assembly of the present application compact.

[0062] In addition, the end surface of the first connecting portion 210 facing away from the second connecting portion 220 is flush with the opening on one side of the mounting groove 110, which can also allow the first connecting portion 210 to completely fill the mounting groove 110 of the base plate 100. In this way, the circumferential inner wall of the mounting groove 110 can contact the outer wall of the first connecting portion 210, so that the first connecting portion 210 can also support the base plate 100 within the mounting groove 110, and the structural strength of the base plate 100 can be relatively higher, thereby making the structural strength of the connection assembly of the present application higher. In addition, the circumferential inner wall of the mounting groove 110 can contact the outer wall of the first connecting portion 210, which can also increase the contact area between the first connecting portion 210 and the base plate 100, thereby further increasing the contact area between the connector 200 and the base plate 100, so that the flow capacity of the connection assembly is further enhanced.

[0063] Since the mounting groove 110 of the base plate 100 is a through-groove structure, the end face of the first connecting portion 210 facing away from the second connecting portion 220 can be exposed. Therefore, the side of the first connecting portion 210 facing away from the second connecting portion 220 can also be fixed to the base plate 100 by welding. This can make the fixed connection effect between the first connecting portion 210 and the base plate 100 more stable and reliable, and can further increase the welding track of the entire connecting member 200 and the base plate 100, so that the structure of the connection assembly of the present application is more stable and the current-carrying capacity is stronger.

[0064] In some embodiments, reference Figures 1 to 3 As shown, the first connection portion 210 of the present application can be embedded in the installation groove 110 of the base plate 100 by interference fit, which can make the fixed connection effect between the first connection portion 210 and the base plate 100 more stable and reliable.

[0065] In some embodiments, reference Figure 3 As shown, the side of the base plate 100 of the present application facing away from the second connecting portion 220 may be provided with a reinforcing protrusion 120. The reinforcing protrusion 120 is a raised structure on the base plate 100. Specifically, the reinforcing protrusion 120 protrudes from the base plate 100 in a direction facing away from the second connecting portion 220. This can enhance the structural strength of the base plate 100, allowing the base plate 100 to be relatively thinner while still maintaining good structural strength. When the connection assembly of the present application is used in a battery, the reinforcing protrusion 120 on the base plate 100 can contact and connect with the tab of the electrode assembly 600 to ensure that the tab of the electrode assembly 600 is fully connected to the base plate 100.

[0066] The number of the reinforcing protrusions 120 can be set to two, so that the two reinforcing protrusions 120 can be in contact with and connected to the two tabs of the electrode assembly 600, or respectively in contact with and connected to one of the tabs of the two motor assemblies.

[0067] In some embodiments, reference Figures 1 to 2 As shown, the bottom plate 100 of the present application may have an inner groove 130 on the side facing away from the reinforcing protrusion 120, and the inner groove 130 is opposite to the reinforcing protrusion 120. Specifically, in order to form the reinforcing protrusion 120 on the bottom plate 100, the bottom plate 100 may be processed by a stamping process so that the reinforcing protrusion 120 is formed on the bottom plate 100. Correspondingly, the inner groove 130 may be formed on the side of the bottom plate 100 facing away from the reinforcing protrusion 120. In this way, the reinforcing protrusion 120 and the bottom plate 100 body may be an integral structure, thereby reducing the material used in the preparation of the bottom plate 100 and making the process of forming the reinforcing protrusion 120 on the bottom plate 100 relatively simpler, which can effectively reduce the preparation cost of the connection assembly of the present application.

[0068] Based on the connection components above, refer to Figures 7 to 8As shown, the embodiment of the present application further proposes a cap assembly, comprising a substrate 300, a pole 400 and the above-mentioned connection assembly. The cap assembly can be applied to a battery and disposed on one side of the top of the battery.

[0069] The bottom plate 100 in the connection assembly is located on one side of the substrate 300, and the second connection portion 220 in the connector 200 is located on the side of the bottom plate 100 facing the substrate 300. Correspondingly, the first connection portion 210 is located on the side of the bottom plate 100 facing away from the substrate 300. The pole 400 is disposed through the substrate 300 and is in contact with the second connection portion 220. Specifically, the pole 400 is in contact with the end surface of the second connection portion 220 facing away from the first connection portion 210, thereby electrically connecting the pole 400 to the connection assembly.

[0070] In some embodiments, the cover assembly may further include an upper plastic 310, a lower plastic 320, and a sealing ring 330, wherein the upper plastic 310 and the lower plastic 320 are located on opposite sides of the substrate 300. The upper plastic 310 may be configured to be sleeved on the pole 400 and located between the pole 400 and the substrate 300. The lower plastic 320 is also sleeved on the pole 400 and located between the substrate 300 and the pole 400, thereby preventing the pole 400 from contacting the substrate 300 and causing a short circuit. The sealing ring 330 is also sleeved on the pole 400 and located between the substrate 300 and the pole 400, thereby ensuring sealing between the substrate 300 and the pole 400.

[0071] Based on the cover assembly above, refer to Figures 4 to 6 As shown, the embodiment of the present application also proposes a battery, including a shell 500, an electrode assembly 600 and the above-mentioned cover assembly, wherein the shell 500 is provided with a cavity and an opening connected to the cavity, the electrode assembly 600 can be disposed in the cavity of the shell 500, and the cover assembly can be disposed at the opening of the shell 500 to block the opening, so that the electrode assembly 600 is sealed in the shell 500 to protect the electrode assembly 600. Specifically, the substrate 300 can be configured to match the opening of the shell 500, and the substrate 300 can be welded to the shell 500 so that the substrate 300 blocks the opening of the shell 500. Accordingly, the bottom plate 100 is located in the shell 500, and the tabs of the electrode assembly 600 are in contact and electrically connected with the reinforcing protrusions 120 on the bottom plate 100, so that the electrode assembly 600 can ultimately be electrically connected to the pole 400.

[0072] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned implementation modes, ordinary technicians in this field should understand that they can still modify the technical solutions described in the aforementioned implementation modes, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A connection assembly, characterized in that: include: The bottom plate (100) is provided with a mounting groove (110); The connecting member (200) comprises a first connecting portion (210), a second connecting portion (220) and a connecting sleeve (230), wherein the first connecting portion (210) and the second connecting portion (220) are connected to each other, the first connecting portion (210) is embedded in the mounting groove (110), the second connecting portion (220) is located outside the mounting groove (110), the connecting sleeve (230) is sleeved on the second connecting portion (220), and the base plate (100) supports the connecting sleeve (230).

2. The connection assembly according to claim 1, characterized in that The outer peripheral edge of the connecting sleeve (230) is welded to the bottom plate (100).

3. The connection assembly according to claim 2, characterized in that The outer diameter of the connecting sleeve (230) is greater than the outer diameter of the second connecting portion (220).

4. The connection assembly according to claim 3, characterized in that The outer diameter of the second connecting portion (220) is greater than the outer diameter of the first connecting portion (210).

5. The connection assembly according to claim 4, characterized in that In a direction away from the first connecting portion (210), the outer diameter of the second connecting portion (220) gradually decreases.

6. The connection assembly according to any one of claims 1 to 5, characterized in that: The installation groove (110) passes through the bottom plate (100), and the end surface of the first connecting portion (210) facing away from the second connecting portion (220) is flush with a side opening of the installation groove (110).

7. The connection assembly according to any one of claims 1 to 5, characterized in that: A side of the bottom plate (100) facing away from the second connecting portion (220) has a reinforcement protrusion (120), and the reinforcement protrusion (120) is arranged in a direction facing away from the second connecting portion (220).

8. The connection assembly according to claim 7, characterized in that The bottom plate (100) has an inner groove (130) on a side facing away from the reinforcing protrusion (120), and the inner groove (130) is opposite to the reinforcing protrusion (120).

9. A cover plate assembly, characterized in that: The invention comprises a substrate (300), a pole (400) and a connection assembly according to any one of claims 1 to 8, wherein the connection assembly is located on one side of the substrate (300), and the pole (400) passes through the substrate (300) and is connected to the second connection portion (220).

10. A battery, characterized in that: The invention comprises a shell (500), an electrode assembly (600), and a cover plate assembly according to claim 9, wherein the shell (500) has a cavity and an opening communicating with the cavity, the electrode assembly (600) is arranged in the cavity, the substrate (300) is sealed in the opening, and the bottom plate (100) is electrically connected to the electrode assembly (600).

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