A cylindrical battery and battery pack

Abstract

The application discloses a cylindrical battery and a battery pack. The cylindrical battery comprises an electric core, a shell assembly and a reinforcing piece. The shell assembly has a receiving cavity, and the electric core is arranged in the receiving cavity. The electric core comprises a body and a tab. The tab and the body are electrically connected. The tab is arranged in a bent manner relative to the body. A first gap is arranged between the tab and the body. The reinforcing piece is arranged in the first gap and connected with the tab. The shell assembly is welded with a side of the tab away from the reinforcing piece. In this way, when the shell assembly and the tab are welded, the reinforcing piece serves as a backing structure. During the welding process, the reinforcing piece can disperse welding thermal stress and mechanical stress, thereby reducing the risk of melting through and making the welding process more stable and controllable. Further, by preventing the tab from melting through, the heat generated when the tab and the shell assembly are welded is prevented from affecting the body, thereby avoiding damage to the body caused by high temperature or molten metal, and ensuring the performance of the cylindrical battery.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a cylindrical battery and a battery pack. Background Technology

[0002] With the rapid development of cylindrical batteries in power and energy storage fields, their performance is receiving increasing attention. A cylindrical battery consists of a cylindrical cell, two current collectors, and a casing. The cylindrical cell includes a cell body and positive and negative tabs, which are located at both ends of the cell body. The two current collectors are respectively mounted at both ends of the cylindrical cell and connected to the positive and negative tabs by welding. The cylindrical cell and current collectors are installed inside the casing.

[0003] In related technologies, welding is commonly used to weld the tabs and current collectors. However, due to the structural strength limitations of the tabs and current collectors, welding can easily melt through the tabs, damaging the cell itself and affecting the performance of the cylindrical battery. Utility Model Content

[0004] This application aims to provide a cylindrical battery and battery pack that can solve the problem of the tabs being easily melted through when using welding processes.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a cylindrical battery, comprising: a battery cell, a housing assembly, and a reinforcing member; the housing assembly has a receiving cavity, and the battery cell is disposed in the receiving cavity; the battery cell includes a body and a tab, the tab and the body are electrically connected, the tab is bent relative to the body, a first gap is provided between the tab and the body, the reinforcing member is disposed in the first gap and connected to the tab, and the housing assembly is welded to the side of the tab opposite to the reinforcing member.

[0006] Optionally, the electrode tab includes a welding portion and a connecting portion; the connecting portion is electrically connected to the body, the welding portion is electrically connected to the connecting portion, the welding portion is bent relative to the connecting portion, a first gap is provided between the welding portion and the body, the housing assembly is welded to the side of the welding portion away from the reinforcing member, and the reinforcing member is connected to the welding portion.

[0007] Optionally, a second gap is provided between the reinforcing member and the body.

[0008] Optionally, the housing assembly includes a housing and a top cover; the housing has a cavity with an opening on one side, the top cover is disposed on the opening and connected to the housing, the housing and the top cover enclose the receiving cavity; at least a portion of the housing protrudes toward the receiving cavity to form a boss, the boss being connected to the side of the tab opposite to the reinforcement.

[0009] Optionally, the height direction of the cylindrical battery is a first direction; the orthographic projection of the boss on a plane perpendicular to the first direction and the orthographic projection of the reinforcing member on a plane perpendicular to the first direction at least partially overlap.

[0010] Optionally, the electrode tab includes a negative electrode tab; the housing includes a bottom wall away from the opening, the negative electrode tab is connected to one end of the body near the bottom wall, the negative electrode tab is bent relative to the body, a first gap is provided between the negative electrode tab and the body, the reinforcing member is disposed in the first gap and electrically connected to the negative electrode tab, and the boss is welded to the side of the negative electrode tab away from the reinforcing member.

[0011] Optionally, the negative electrode tab includes a first sub-negative electrode tab and a second sub-negative electrode tab, and the reinforcing member is provided with at least two; the first sub-negative electrode tab and the second sub-negative electrode tab are respectively electrically connected to the main body, and both the first sub-negative electrode tab and the second sub-negative electrode tab are bent relative to the main body; the first gap is provided between the first sub-negative electrode tab and the main body, and the first gap is provided between the second sub-negative electrode tab and the main body; the first sub-negative electrode tab and the second sub-negative electrode tab are spaced apart along the circumference of the cylindrical battery; the reinforcing member is provided in the first gap corresponding to the first sub-negative electrode tab and the first gap corresponding to the second sub-negative electrode tab.

[0012] Optionally, the reinforcing member corresponding to the first sub-negative electrode tab and the reinforcing member corresponding to the second sub-negative electrode tab are separate molding structures; or, the reinforcing member corresponding to the first sub-negative electrode tab and the reinforcing member corresponding to the second sub-negative electrode tab are integral molding structures.

[0013] Optionally, a portion of the bottom wall is recessed in a direction away from the receiving cavity to form a recessed portion; the recessed portion has a thinning area on the side facing the electrode tab, or the recessed portion has a thinning area on the side away from the electrode tab.

[0014] Secondly, embodiments of this application propose a battery pack including the cylindrical battery described in the above embodiments.

[0015] In this embodiment, a reinforcing member is provided in the first gap between the tab and the body, and the reinforcing member is connected to the tab. Thus, when the housing assembly is welded to the tab, the reinforcing member acts as a backing structure, dispersing welding thermal and mechanical stresses during the welding process, thereby reducing the risk of melt-through and making the welding process more stable and controllable. Furthermore, by preventing the tab from melting through, the heat generated during the welding of the tab and terminal post is prevented from affecting the body, thus avoiding damage to the body from high temperatures or molten metal, and ensuring the performance of the cylindrical battery.

[0016] 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

[0017] 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: Figure 1 This is a schematic diagram of a cylindrical battery according to an embodiment of this application; Figure 2 This is an exploded view of a cylindrical battery according to an embodiment of this application; Figure 3 It is along Figure 1 Sectional view of line AA in the middle; Figure 4 yes Figure 3 An enlarged view of section B, shown in the center circle; Figure 5 yes Figure 3 Enlarged view of section C, shown in the center circle; Figure 6 This is a schematic diagram of the battery cell before winding; Figure 7 This is a schematic diagram of the structure of the battery cell after winding; Figure 8 This is a schematic diagram of the battery cell after the tabs have been flattened; Figure 9 yes Figure 8 Enlarged view of section D shown in the center circle; Figure 10 This is a schematic diagram of the housing according to an embodiment of this application.

[0018] Figure label: 10. Battery cell; 11. Battery body; 12. Electrode tab; 121. Welding part; 122. Connecting part; 123. Positive electrode tab; 124. Negative electrode tab; 124a. First sub-negative electrode tab; 124b. Second sub-negative electrode tab; 13. First gap; 14. Second gap; 20. Housing assembly; 21. Receiving cavity; 22. Boss; 23. Thinning area; 24. Housing; 241. Cavity; 242. Opening; 243. Bottom wall; 25. Top cover; 30. Reinforcing member; 40. Current collector; 50. Sealing member; 60. Positive terminal; X, First direction. Detailed Implementation

[0019] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] 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.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] In current technology, large cylindrical batteries with all tabs are formed by flattening or pressing to create flat tab end faces. The tab end faces are then welded to the current collector using a welding process, and the current collector is further connected to the positive and negative terminals to assemble the battery. However, during laser welding, the intensity of the laser welding needs to be precisely controlled. If the laser intensity is too high, it can easily cause the tabs to melt through, thereby damaging the battery cell itself; if the laser intensity is too low, the welding strength between the tabs and the current collector will be insufficient.

[0024] The cylindrical battery and battery pack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0025] like Figures 1 to 4 As shown in the embodiment of this application, a cylindrical battery is proposed, including: a cell 10, a housing assembly 20, and a reinforcing member 30; the housing assembly 20 has a receiving cavity 21, and the cell 10 is disposed in the receiving cavity 21; the cell 10 includes a body 11 and a tab 12, the tab 12 and the body 11 are electrically connected, the tab 12 is bent relative to the body 11, a first gap 13 is provided between the tab 12 and the body 11, the reinforcing member 30 is disposed in the first gap 13 and connected to the tab 12, and the housing assembly 20 is welded to the side of the tab 12 away from the reinforcing member 30.

[0026] In this embodiment, a reinforcing member 30 is provided in the first gap 13 between the tab 12 and the body 11, and the reinforcing member 30 is connected to the tab 12. Thus, when the housing assembly 20 is welded to the tab 12, the reinforcing member 30 acts as a backing structure. During the welding process, the reinforcing member 30 can disperse the welding thermal and mechanical stresses, thereby reducing the risk of melt-through and making the laser welding process more stable and controllable. Furthermore, by preventing the tab 12 from melting through, the heat generated during the welding of the tab 12 and the housing assembly 20 is prevented from affecting the body, thereby avoiding damage to the body from high temperatures or molten metal, and ensuring the performance of the cylindrical battery.

[0027] It should be noted that laser welding is a high-precision and high-efficiency welding method that uses a high-energy-density laser beam as a heat source to locally heat the workpiece, causing it to melt and form a molten pool, thereby achieving the joining of materials.

[0028] Optionally, such as Figure 3 and Figure 4 As shown, the tab 12 includes a welding part 121 and a connecting part 122; the connecting part 122 is electrically connected to the body 11, the welding part 121 is electrically connected to the connecting part 122, the welding part 121 is bent relative to the connecting part 122, a first gap 13 is provided between the connecting part 122 and the body 11, the housing assembly 20 is welded to the side of the welding part 121 away from the reinforcing member 30, and the reinforcing member 30 is connected to the welding part 121.

[0029] In this embodiment, the connecting portion 122 is electrically connected to the body 11, and the welding portion 121 is electrically connected to the connecting portion 122. The welding portion 121 is bent relative to the connecting portion 122. The housing assembly 20 is welded to the side of the welding portion 121 away from the reinforcing member 30, and the reinforcing member 30 is connected to the welding portion 121. Thus, by placing the reinforcing member 30 in the first gap 13 between the welding portion 121 and the body 11, installation space is provided for the reinforcing member 30, avoiding additional space occupation of the cylindrical battery along the first direction X, thereby improving the energy density of the cylindrical battery. Here, the first direction X is the height direction of the cylindrical battery.

[0030] It should be noted that the bending of the welding part 121 relative to the connecting part 122 can be understood as the welding part 121 being bent at the top of the connecting part 122 in a direction away from the center of the cylindrical battery.

[0031] Optionally, such as Figure 4 As shown, a second gap 14 is provided between the reinforcing member 30 and the body 11.

[0032] In this embodiment, a second gap 14 is provided between the reinforcing member 30 and the body 11. This prevents heat generated by the tab 12 from being directly transferred to the body 11 through the reinforcing member 30, thus avoiding damage to the body 11. Furthermore, the second gap 14 prevents contact between the reinforcing member 30 and the body 11, thereby preventing damage to the body 11. It should be noted that the size of the second gap 14 can be set according to actual needs, and this application embodiment does not limit it.

[0033] Optionally, such as Figures 2 to 4 As shown, the housing assembly 20 includes a housing 24 and a top cover 25; the housing 24 has a cavity 241 with an opening 242 on one side, the top cover 25 is disposed on the opening 242 and connected to the housing 24, the housing 24 and the top cover 25 together form a receiving cavity 21; at least a portion of the housing 24 protrudes toward the receiving cavity 21 to form a boss 22, the boss 22 is welded to the side of the tab 12 away from the reinforcing member 30.

[0034] In this embodiment, a cavity 241 with an opening 242 is provided on one side of the housing 24. A top cover 25 is placed over the opening 242 and connected to the housing 24 to form a receiving cavity 21. A boss 22 is provided on the side of the housing 24 facing the receiving cavity 21, and the boss 22 is connected to the side of the tab 12 away from the reinforcing member 30. In this way, the boss 22 provides a welding platform for welding the tab 12, which is beneficial to improving the convenience of welding. At the same time, by welding the boss 22 and the tab 12, a tight fit can be achieved, thereby improving the stability of laser welding. In addition, after the current flows out from the body 11, it is directly guided to the housing 24 through the tab 12 and the boss 22, eliminating the current collector component in the traditional structure and simplifying the structure of the cylindrical battery.

[0035] In some embodiments, the boss 22 has an arc-shaped structure, and the reinforcing member 30 also has an arc-shaped structure; of course, the structure of the boss 22 and the structure of the reinforcing member 30 can be selected according to actual needs, as long as the structure of the reinforcing member 30 and the structure of the boss 22 are compatible.

[0036] In some embodiments, the boss 22 may also be provided on the top cover 25, and the tab 12 and the boss 22 on the top cover 25 are electrically connected.

[0037] Optionally, such as Figure 4 As shown, the height direction of the cylindrical battery is the first direction X; the orthographic projection of the boss 22 on the plane perpendicular to the first direction X and the orthographic projection of the reinforcing member 30 on the plane perpendicular to the first direction X at least partially coincide.

[0038] In this embodiment, the orthographic projection of the boss 22 on a plane perpendicular to the first direction X and the orthographic projection of the reinforcing member 30 on a plane perpendicular to the first direction X are at least partially overlapped. This facilitates positioning when welding the boss 22 and the reinforcing member 30, thereby simplifying the welding operation.

[0039] Optionally, such as Figure 3 and Figure 4 As shown, the tab 12 includes a negative tab 124; the housing 24 includes a bottom wall 243 facing away from the opening 242, the negative tab 124 is connected to one end of the body 11 near the bottom wall 243, the negative tab 124 is bent relative to the body 11, a first gap 13 is provided between the negative tab 124 and the body 11, the reinforcing member 30 is provided in the first gap 13 and is electrically connected to the negative tab 124, and the boss 22 is connected to the side of the negative tab 124 facing away from the reinforcing member 30.

[0040] Specifically, such as Figures 6 to 9 As shown, one side of the main body 11 has multiple spaced-apart positive electrode tabs 123, and the other side of the main body 11 has multiple spaced-apart negative electrode tabs 124. Figure 6 The battery cell 10 is wound into a shape like Figure 7 The battery cell 10 shown in the figure has two spaced-apart positive electrode clusters at one end, each positive electrode cluster being formed by stacking multiple positive electrodes 123. Similarly, the other end of the battery cell 10 has two spaced-apart negative electrode clusters, each negative electrode cluster being formed by stacking multiple negative electrodes 124.

[0041] In this embodiment, the negative electrode tab 124 is typically made of copper, while the positive electrode tab 123 is made of aluminum. Copper has better thermal conductivity, electrical conductivity, ductility, and weldability compared to aluminum. Therefore, the negative electrode tab 124 is connected to the end of the body 11 near the bottom wall 243 and bent relative to the body 11. The reinforcing member 30 is disposed in the first gap 13 between the negative electrode tab 124 and the body 11 and is electrically connected to the negative electrode tab 124. The boss 22 is connected to the side of the negative electrode tab 124 away from the reinforcing member 30. This makes welding the copper negative electrode tab 124 and the boss 22 more convenient for welding operations. In addition, by connecting the negative electrode tab 124 to the boss 22 on the housing 24, components such as the current collector and negative electrode post are reduced, thereby reducing parts and production costs and simplifying the cylindrical battery. Furthermore, by connecting the negative electrode tab 124 to the boss 22 on the housing 24, the housing 24 does not need to have an additional hole at the negative electrode to install the negative electrode post, thereby reducing the risk of leakage and improving the sealing and safety of the housing 24.

[0042] In some embodiments, such as Figure 5 and Figure 6 As shown, the cylindrical battery also includes a current collector 40 and a positive terminal 60; the positive terminal 60 is disposed through the top cover 25, the current collector 40 is disposed between the positive terminal 60 and the positive terminal tab 123, and the positive terminal tab 123 is electrically connected to the positive terminal 60 through the current collector 40.

[0043] In some embodiments, the cylindrical battery further includes a sealing element 50; the positive electrode post 60 has an injection port on the side away from the cell 10 for injecting electrolyte. After the electrolyte is injected, the sealing element 50 is placed on the side of the positive electrode post 60 away from the cell 10 to seal the injection port, thereby enhancing the airtightness of the positive electrode post 60.

[0044] Optionally, such as Figure 3 and Figure 4As shown, the negative electrode tab 124 includes a first sub-negative electrode tab 124a and a second sub-negative electrode tab 124b, and at least two reinforcing members 30 are provided. The first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b are electrically connected to the main body 11 respectively. The first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b are both bent relative to the main body 11. A first gap 13 is provided between the first sub-negative electrode tab 124a and the main body 11, and between the second sub-negative electrode tab 124b and the main body 11. The first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b are spaced apart along the circumference of the cylindrical battery. The first gap 13 corresponding to the first sub-negative electrode tab 124a and the first gap 13 corresponding to the second sub-negative electrode tab 124b are both provided with reinforcing members 30.

[0045] In this embodiment, the negative electrode tab 124 is configured as a first sub-negative electrode tab 124a and a second sub-negative electrode tab 124b, which are electrically connected to the main body 11. This facilitates the simultaneous output of current through the first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b, increasing the overcurrent of the cylindrical battery and improving the discharge rate. Furthermore, both the first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b are bent relative to the main body 11 and spaced apart circumferentially along the cylindrical battery. Reinforcing members 30 are provided in the first gap 13 corresponding to the first sub-negative electrode tab 124a and the first gap 13 corresponding to the second sub-negative electrode tab 124b, thereby preventing the risk of melt-through during welding of the first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b and improving the welding yield.

[0046] In some embodiments, the negative electrode tab 124 may further include a third sub-negative electrode tab and a fourth sub-negative electrode tab, with the first sub-negative electrode tab 124a, the second sub-negative electrode tab 124b, the third sub-negative electrode tab, and the fourth sub-negative electrode tab being spaced apart along the circumference of the cylindrical battery; of course, the number of sub-negative electrode tabs may be more, and this application embodiment does not limit this.

[0047] Optionally, such as Figures 2 to 4 As shown, the reinforcing member 30 corresponding to the first sub-negative electrode tab 124a and the reinforcing member 30 corresponding to the second sub-negative electrode tab 124b are split-form structures.

[0048] In this embodiment, the reinforcing member 30 corresponding to the first sub-negative electrode tab 124a and the reinforcing member 30 corresponding to the second sub-negative electrode tab 124b are configured as separate molding structures. This allows for greater flexibility during welding. Furthermore, separate molding facilitates manufacturing, thereby saving costs.

[0049] Optionally, such as Figures 2 to 4 As shown, the reinforcing member 30 corresponding to the first sub-negative electrode tab 124a and the reinforcing member 30 corresponding to the second sub-negative electrode tab 124b are integrally formed structures.

[0050] In this embodiment, by configuring the reinforcing member 30 corresponding to the first sub-negative electrode tab 124a and the second sub-negative electrode tab 124b as an integrally formed structure, the support and installation of all corresponding negative electrode tabs 124 can be completed with only one positioning operation during assembly, thereby reducing assembly steps and time and improving efficiency. In addition, the integrally formed reinforcing member 30 can reduce the number of parts and lower costs.

[0051] In some embodiments, the reinforcing member 30 may be configured as a ring structure, or a connector may be provided between the two reinforcing members 30 to connect the two reinforcing members 30 so that the two reinforcing members 30 are integrally formed. This application embodiment does not limit this.

[0052] Optionally, such as Figure 4 and Figure 10 As shown, a portion of the bottom wall 243 is recessed in the direction away from the receiving cavity 21 to form a recessed portion; a thinning area 23 is provided on the side of the recessed portion facing the tab 12.

[0053] In this embodiment, a recessed portion is formed by recessing the bottom wall 243 in a direction away from the receiving cavity 21. A thinning region 23 is provided on the side of the recessed portion facing the tab 12. In this way, when thermal runaway occurs in the cylindrical battery, the thinning region 23 can crack, thereby relieving pressure on the cylindrical battery and improving the safety of the cylindrical battery. Optionally, a portion of the bottom wall 243 is recessed in the direction away from the receiving cavity 21 to form a recessed portion, and a thinning area 23 is provided on the side of the recessed portion away from the tab 12.

[0054] In this embodiment, a recessed portion is formed by recessing the bottom wall 243 in a direction away from the receiving cavity 21. A thinning region 23 is provided on the side of the recessed portion away from the tab 12. In this way, when the cylindrical battery experiences thermal runaway, the thinning region 23 can crack open, thereby relieving pressure on the cylindrical battery and improving the safety of the cylindrical battery.

[0055] In some embodiments, the thinning area 23 may be a groove or a groove, and the embodiments of this application do not limit this.

[0056] Optionally, embodiments of this application propose a battery pack including the cylindrical battery described in the above embodiments.

[0057] In this embodiment, a reinforcing member 30 is provided in the first gap 13 between the tab 12 and the body 11, and the reinforcing member 30 is connected to the tab 12. Thus, when the housing assembly 20 is welded to the tab 12, the reinforcing member 30 acts as a backing structure. During the welding process, the reinforcing member 30 can disperse the welding thermal and mechanical stresses, thereby reducing the risk of melt-through and making the laser welding process more stable and controllable. Furthermore, by preventing the tab 12 from melting through, the heat generated during the welding of the tab 12 and the housing assembly 20 is prevented from affecting the body, thereby avoiding damage to the body from high temperatures or molten metal, and ensuring the performance of the cylindrical battery.

[0058] 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.

[0059] 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 cylindrical battery, characterized in that, include: Battery cell (10), housing assembly (20) and reinforcement (30); The housing assembly (20) has a receiving cavity (21), and the battery cell (10) is disposed in the receiving cavity (21). The battery cell (10) includes a body (11) and a tab (12). The tab (12) and the body (11) are electrically connected. The tab (12) is bent relative to the body (11). A first gap (13) is provided between the tab (12) and the body (11). The reinforcing member (30) is disposed in the first gap (13) and connected to the tab (12). The housing assembly (20) is welded to the side of the tab (12) away from the reinforcing member (30).

2. The cylindrical battery according to claim 1, characterized in that, The electrode tab (12) includes a welding part (121) and a connecting part (122); The connecting part (122) is electrically connected to the body (11), the welding part (121) is electrically connected to the connecting part (122), the welding part (121) is bent relative to the connecting part (122), the first gap (13) is provided between the welding part (121) and the body (11), the housing assembly (20) is welded to the side of the welding part (121) away from the reinforcing member (30), and the reinforcing member (30) is connected to the welding part (121).

3. The cylindrical battery according to claim 1, characterized in that, A second gap (14) is provided between the reinforcing member (30) and the body (11).

4. The cylindrical battery according to claim 1, characterized in that, The housing assembly (20) includes a housing (24) and a top cover (25); The housing (24) has a cavity (241) with an opening (242) on one side. The top cover (25) is placed over the opening (242) and connected to the housing (24). The housing (24) and the top cover (25) enclose the receiving cavity (21). At least a portion of the housing (24) protrudes toward the receiving cavity (21) to form a boss (22). The boss (22) is welded to the side of the tab (12) away from the reinforcing member (30).

5. The cylindrical battery according to claim 4, characterized in that, The height direction of the cylindrical battery is the first direction (X); the orthographic projection of the boss (22) on the plane perpendicular to the first direction (X) and the orthographic projection of the reinforcing member (30) on the plane perpendicular to the first direction (X) at least partially overlap.

6. The cylindrical battery according to claim 4, characterized in that, The electrode (12) includes a negative electrode (124); The housing (24) includes a bottom wall (243) facing away from the opening (242), the negative electrode tab (124) is connected to one end of the body (11) near the bottom wall (243), the negative electrode tab (124) is bent relative to the body (11), the first gap (13) is provided between the negative electrode tab (124) and the body (11), the reinforcing member (30) is disposed in the first gap (13) and electrically connected to the negative electrode tab (124), and the boss (22) is connected to the side of the negative electrode tab (124) facing away from the reinforcing member (30).

7. The cylindrical battery according to claim 6, characterized in that, The negative electrode tab (124) includes a first sub-negative electrode tab (124a) and a second sub-negative electrode tab (124b), and the reinforcing member (30) is provided with at least two; The first sub-negative electrode tab (124a) and the second sub-negative electrode tab (124b) are electrically connected to the body (11) respectively. The first sub-negative electrode tab (124a) and the second sub-negative electrode tab (124b) are both bent relative to the body (11). The first gap (13) is provided between the first sub-negative electrode tab (124a) and the body (11) and between the second sub-negative electrode tab (124b) and the body (11). The first sub-negative electrode tab (124a) and the second sub-negative electrode tab (124b) are spaced apart along the circumference of the cylindrical battery. The first gap (13) corresponding to the first sub-negative electrode tab (124a) and the first gap (13) corresponding to the second sub-negative electrode tab (124b) are both provided with the reinforcing member (30).

8. The cylindrical battery according to claim 7, characterized in that, The reinforcing member (30) corresponding to the first sub-negative electrode tab (124a) and the reinforcing member (30) corresponding to the second sub-negative electrode tab (124b) are separate molding structures; or, the reinforcing member (30) corresponding to the first sub-negative electrode tab (124a) and the reinforcing member (30) corresponding to the second sub-negative electrode tab (124b) are integral molding structures.

9. The cylindrical battery according to claim 6, characterized in that, A portion of the bottom wall (243) is recessed in a direction away from the receiving cavity (21) to form a recessed portion; The recessed portion has a thinning area (23) on the side facing the tab (12), or the recessed portion has a thinning area (23) on the side away from the tab (12).

10. A battery pack, characterized in that, Includes the cylindrical battery as described in any one of claims 1-9.

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