Battery and electric device

Abstract

This application provides a battery and an electrical device. The battery includes: a housing defining a mounting cavity within the housing, and a mounting hole communicating with the mounting cavity along a first direction; a cell assembly including: a cell body disposed in the mounting cavity; a conductive element disposed in the mounting cavity and connected to the cell body, the conductive element having at least one bent segment; and an electrode post disposed in the mounting hole, the end face of the electrode post facing the mounting cavity being welded to the bent segment to form a welding area, the portion of the bent segment outside the welding area forming a connection area, the thickness T of the connection area along the first direction satisfying: 0.2mm ≤ T ≤ 0.9mm. The battery of this application, by designing the thickness of the connection area on the conductive element, ensures that the conductive element has sufficient structural strength, avoids tearing of the conductive element due to external impact, and further improves the conductive stability between the conductive element and the electrode post.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery and an electrical device. Background Technology

[0002] With the rapid development of new energy technologies, batteries, as core components for energy storage and supply, have attracted much attention regarding their performance and safety. In the structural design of batteries, the conductive connection between the tabs and terminals is a key factor affecting the battery's conductivity and structural stability.

[0003] In traditional batteries, the tabs and terminals are usually connected by welding. When the battery is subjected to vibration or other impacts, the tearing force at the connection between the tabs and terminals is large, which can easily cause tearing around the connection area between the tabs and terminals, leading to battery failure. Utility Model Content

[0004] This application provides a battery and electrical device. By bending and storing the conductive component in the receiving cavity, a folded structure with a certain buffering effect is formed, which improves the connection stability between the conductive component and the terminal. The thickness of the connection area on the conductive component is designed to ensure that the conductive component has sufficient structural strength and avoids tearing of the conductive component due to external impact, thereby further improving the conductivity stability between the conductive component and the terminal.

[0005] On one hand, this application provides a battery, including: a housing, wherein a mounting cavity is defined within the housing, and the housing is provided with a mounting hole communicating with the mounting cavity along a first direction; a cell assembly, including: a cell body disposed in the mounting cavity; a conductive element disposed in the mounting cavity, the conductive element being connected to the cell body, and the conductive element having at least one bent segment formed by bending; and an electrode post disposed in the mounting hole, wherein the end face of the electrode post facing the mounting cavity is welded to the bent segment to form a welding area, and the portion of the bent segment located outside the welding area forms a connection area, wherein the thickness T of the connection area along the first direction satisfies: 0.2mm≤T≤0.9mm.

[0006] The battery described above, by bending and housing the conductive components within the cavity, improves the space utilization within the casing, thereby increasing the battery's energy density. The bending of the conductive components forms a folded structure with a certain buffering effect, which evenly distributes the force on the conductive components when the battery is subjected to external impact, thus improving the connection stability between the conductive components and the terminals.

[0007] The thickness of the connection area on the conductive component is designed to ensure that the connection area has a suitable thickness without affecting the conductivity of the conductive component. This ensures that the conductive component has sufficient structural strength, avoids tearing of the conductive component due to external impact, improves the conductivity stability between the conductive component and the terminal, and thus improves the structural reliability of the battery, which is conducive to extending the battery's service life. Attached Figure Description

[0008] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0009] Figure 1 This is a schematic diagram of the battery structure according to an embodiment of the present invention;

[0010] Figure 2 This is a schematic diagram of the internal structure of the battery according to an embodiment of the present invention;

[0011] Figure 3 This is one of the structural schematic diagrams of the conductive component in an embodiment of this utility model;

[0012] Figure 4 This is the second schematic diagram of the conductive component in an embodiment of this utility model.

[0013] Explanation of reference numerals in the attached figures:

[0014] 100-battery;

[0015] 110 - Housing; 111 - Mounting cavity; 112 - Cover plate;

[0016] 120 - Battery cell assembly; 121 - Battery cell body; 122 - Conductive component; 122a - Welding area; 122b - Connection area; 1221 - Bending section; 1221a - First bending section; 1221b - Second bending section; 1222 - Tail end; 1223 - Closing section; 1224 - Connection section; 1225 - First bending groove; 1226 - Second bending groove;

[0017] 130-Pole Column;

[0018] 140 - Mounting bracket;

[0019] 150-partition.

[0020] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0022] With the rapid development of new energy technologies, batteries, as core components for energy storage and supply, have attracted much attention regarding their performance and safety. In the structural design of batteries, the conductive connection between the tabs and terminals is a key factor affecting the battery's conductivity and structural stability.

[0023] In traditional batteries, the tabs and terminals are usually connected by welding. When the battery is subjected to vibration or other impacts, the tearing force at the connection between the tabs and terminals is large, which can easily cause tearing around the connection area between the tabs and terminals, leading to battery failure.

[0024] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0025] For ease of explanation and understanding, please refer to... Figure 1 The height direction of the battery can be the Z direction (first direction), the width direction of the battery can be the X direction (second direction), and the length direction of the battery can be the Y direction (third direction).

[0026] refer to Figures 1 to 4 On the one hand, this application provides a battery 100, which may include: a casing 110, a cell assembly 120, and terminals 130.

[0027] The housing 110 has a cavity for accommodating the battery cell assembly 120. At least one end of the housing 110 has an opening communicating with the cavity. A cover plate 112 can be used to seal the opening. For example, the opening can be located on one end wall of the housing 110, or the opening can be located at both opposite ends of the housing 110 along the height (width / length) direction of the battery 100. The location of the opening is related to the arrangement of the battery cell assembly 120 of the battery 100, and the conductive element 122 on the battery cell assembly 120 faces the opening. The opening can be located on one side of the housing 110 along the Z direction, one side along the Y direction, or one side along the X direction.

[0028] Understandably, the battery 100 of this application can be a prismatic battery 100, and correspondingly, the cross-section of the casing 110 is square, and the casing opening is also square; or, the battery 100 can be a cylindrical battery 100, and correspondingly, the cross-section of the casing 110 is circular, and the casing opening is also circular.

[0029] Optionally, the material of the housing 110 may include at least one of aluminum, aluminum alloy, steel, copper, nickel, magnesium, and titanium, or the housing 110 may also include other alloy materials.

[0030] The cover plate 112 may define a mounting hole that communicates with the receiving cavity. The electrode post 130 is fixedly disposed in the mounting hole and fixedly connected to the conductive element 122 of the cell assembly 120, forming a stable current-conducting channel, allowing the cell assembly 120 to connect to an external circuit and conduct current. Exemplarily, the electrode post 130 can be fixedly mounted in the mounting hole using sealant, or it can be fixedly mounted in the mounting hole using other structural components (such as the mounting bracket 140 described later) to facilitate assembly.

[0031] The cell assembly 120 is an energy storage device within the battery 100. The cell assembly 120 may include a cell body 121 and a conductive element 122. The cell body 121 is formed by winding or stacking a positive electrode, a negative electrode and a separator disposed between them.

[0032] The positive electrode sheet may include a positive electrode current collector and a positive electrode active material. The positive electrode current collector may be made of metal materials such as aluminum foil, nickel foil, or stainless steel, or it may be a composite foil formed by combining metals and insulating materials. The positive electrode active material includes the main positive electrode material, conductive agent, and binder. Among them, the main positive electrode material includes one or more lithium-containing positive electrode active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0033] Similarly, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material. The negative electrode current collector may be made of metal materials such as copper foil, aluminum foil, or stainless steel, or it may be a composite foil formed by combining metals and insulating materials. The negative electrode active material may include a negative electrode active material, a conductive agent, and a binder. Among them, the negative electrode active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, and lithium titanate.

[0034] In addition, the cavity can also contain electrolyte. During normal use of the battery 100, the electrolyte needs to continuously wet the cell body 121, replenishing the electrolyte level. The capacity of the electrolyte is related to the performance of the battery 100. A lack of electrolyte in the battery 100 will affect the replenishment process, thus affecting its charge and discharge performance. Therefore, the more space within the cavity used to hold the electrolyte, the better it is for improving the performance of the battery 100.

[0035] There can be at least two conductive elements 122, which are respectively connected to the positive electrode and the negative electrode of the cell body 121 to form positive conductive element 122 and negative conductive element 122. Correspondingly, the number of poles 130 can be multiple corresponding to the conductive elements 122, so as to realize the function of connecting the cell assembly 120 with the external circuit and conducting current.

[0036] The conductive element 122 is disposed within the mounting cavity 111 and has at least one bent segment 1221. Exemplarily, the conductive element 122 may have one bent segment 1221. The end face of the electrode post 130 facing the mounting cavity 111 is welded to the bent segment 1221, causing a portion of the conductive element 122 extending in the first direction to be flipped to the second direction. This reduces the space occupied by the conductive element 122 in the first direction (the height direction of the battery 100), which is beneficial for improving the space utilization within the housing 110 and thus increasing the energy density of the battery 100. Alternatively, the conductive element 122 may also have two bent segments 1221 formed by two bends. The conductive element 122 is housed within the mounting cavity 111 after two bends. This further reduces the space occupied by the conductive element 122 in the first direction (the height direction of the battery 100), which is beneficial for improving the space utilization within the housing 110 and thus increasing the energy density of the battery 100. On the other hand, the stacked structure formed by the two bends provides support and buffer for the bent section 1221 of the conductive element 122 that is connected to the pole post 130, thereby improving the structural stability of the conductive element 122.

[0037] It should be noted that during the process of forming a stacked structure through multiple bends to buffer and support the connection between the conductive component 122 and the terminal post 130, the more bends there are, the more bend segments 1221 there are, and consequently, the more stress concentration is generated by the bends, and the more easily the conductive component 122 is damaged. Therefore, the number of bends of the conductive component 122 should not be too many.

[0038] Specifically, taking an embodiment with two bent segments 1221 on the conductive element 122 as an example, the packaging process of the battery cell assembly 120 of this application is illustrated: the conductive element 122 and the battery cell body 121 are installed together in the receiving cavity. The conductive element 122 extends outward along the first direction. The worker applies two bending actions to the conductive element 122, so that the conductive element 122 forms a double-layer folded structure along the first direction. Therefore, the space occupied by the battery cell assembly 120 in the receiving cavity along the first direction is reduced to a certain extent, so that the housing 110 can have more space to accommodate a larger battery cell body 121, thereby improving the energy density of the battery 100, or, so that the receiving cavity can have enough electrolyte to ensure the charging and discharging performance of the battery 100.

[0039] The end face of the pole post 130 facing the mounting cavity 111 is welded to the bent section 1221 to form a welding area 122a. The portion of the bent section 1221 outside the welding area 122a forms a connection area 122b. The thickness T of the connection area 122b along the first direction satisfies: 0.2mm≤T≤0.9mm. For example, the thickness T of the connection area 122b along the first direction can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm or 0.9mm. Of course, the thickness T of the connection area 122b along the first direction can also be other values. Designers can choose according to their needs. This application does not limit this.

[0040] The connection area 122b is the structure on the conductive component 122 that connects to the welding area 122a. In the prior art, when the battery 100 is subjected to a large external impact, this structure is prone to tearing. In this application, the thickness T of the connection area 122b is designed reasonably. On the one hand, it avoids the connection area 122b being too thin, resulting in insufficient structural strength at the connection area 122b, making it prone to tearing when the battery 100 is subjected to impact or vibration. On the other hand, it avoids the connection area 122b being too thick. After the terminal post 130 is welded to the conductive component 122, the conductive component 122 is bent and housed in the receiving cavity. If the thickness of the connection area 122b is too large, it will inevitably exert pressure on the part of the conductive component 122 connected to the cell body 121 during bending, causing the root of the conductive component 122 to insert into the cell body 121, resulting in a short circuit inside the cell body 121.

[0041] The battery 100 of this invention improves the space utilization within the casing 110 by bending and housing the conductive element 122 within the receiving cavity, thereby increasing the energy density of the battery 100. The bending of the conductive element 122 forms a folded structure with a certain buffering effect, which evenly disperses the force on the conductive element 122 when the battery 100 is subjected to external impact, thus improving the connection stability between the conductive element 122 and the terminal post 130.

[0042] The thickness of the connection area 122b on the conductive component 122 is designed to ensure that the connection area 122b has a suitable thickness without affecting the conductivity of the conductive component 122. This ensures that the conductive component 122 has sufficient structural strength, avoids tearing of the conductive component 122 due to external impact, improves the conductivity stability between the conductive component 122 and the terminal post 130, thereby improving the structural reliability of the battery 100 and helping to extend the service life of the battery 100.

[0043] refer to Figure 4 In some embodiments, the width D1 of the conductive element 122 along the second direction satisfies: 10mm≤D1≤20mm. For example, the width D1 of the conductive element 122 along the second direction can be 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm. Of course, the width D1 of the conductive element 122 along the second direction can also be other values. Designers can select according to their needs, and this application does not limit this.

[0044] The conductive element 122 has a suitable width dimension D1. On the one hand, this helps to improve the structural strength of the conductive element 122, prevents tearing of the conductive element 122, and thus improves the connection stability between the conductive element 122 and the terminal 130. On the other hand, a suitable width D1 of the conductive element 122 ensures that the conductive element 122 has a sufficient cross-sectional area to meet the requirements of high current conduction, reduces heat generation when current flows, and improves the safety of the battery 100.

[0045] refer to Figure 3 In some embodiments, the end of the conductive element 122 away from the cell body 121 forms a tail 1222. In other words, the structure of the end of the welding area 122a on the bent section 1221 away from the connection area 122b extends in a third direction to form the tail 1222.

[0046] Along the third direction, the interval D2 between the welding area 122a and the tail 1222 satisfies: 2mm≤D2≤6mm. For example, the interval D2 between the welding area 122a and the tail 1222 can be 2mm, 3mm, 4mm, 5mm or 6mm. Of course, the interval D2 between the welding area 122a and the tail 1222 can also be other values. Designers can choose according to their needs. This application does not limit this.

[0047] On the one hand, to avoid the distance between the tail section 1222 and the welding area 122a being too close, it is easy to cause a poor solder joint when the terminal 130 is welded to the conductive component 122, which would affect the current flow area between the conductive component 122 and the terminal 130. On the other hand, to avoid the tail section 1222 extending too far beyond the welding area 122a, causing the tail section 1222 to hang in a suspended state. When the conductive component 122 is bent and stored in the mounting cavity 111, the tail section 1222 may be inserted upside down into the cell body 121, causing a short circuit inside the battery 100 and damaging the battery 100.

[0048] Understandably, in this application, the welding between the electrode post 130 and the conductive element 122 can be achieved by forming a weld pool within a certain area. The electrode post 130 and the conductive element 122 are respectively welded to the corresponding portions of the weld pool, and the area corresponding to the weld pool constitutes the welding area 122a. The distance D2 between the tail 1222 of the conductive element 122 and the welding area 122a can refer to the distance between the tail 1222 and the end of the welding area 122a closest to the tail 1222. Alternatively, the electrode post 130 and the conductive element 122 can be fixed by welding at multiple points within a certain area. The area where the welding points are distributed constitutes the welding area 122a, and the aforementioned distance D2 between the tail 1222 and the welding area 122a can refer to the distance between the tail 1222 and the nearest welding point.

[0049] Understandably, the cell body 121 of the battery 100 of this application can be a wound core structure or a stacked core structure.

[0050] For the wound-type cell body 121, the positive and negative electrode sheets are formed by winding them together, with a separator separating the positive and negative electrode sheets. Both the positive and negative electrode sheets can be integral structures. Taking the positive electrode sheet as an example, multiple tabs can be provided at the current collector end of the positive electrode sheet. During the winding process to form the cell body 121, the outer tabs and the inner tabs are in contact to form an integral conductive element 122. Since the perimeter of each layer of the cell body 121 is different during winding, the spacing between two adjacent tabs along the length direction of the positive electrode sheet will be adjusted accordingly.

[0051] For the stacked core structure of the cell body 121, multiple positive electrode plates, separators and negative electrode plates are stacked sequentially along their thickness direction to form the cell body 121. Each positive electrode plate and negative electrode plate is provided with only one tab. When the positive electrode plate, separator and negative electrode plate are stacked sequentially, the tab of the positive electrode is stacked to form the positive electrode conductive element 122, and the tab of the negative electrode is stacked to form the negative electrode conductive element 122.

[0052] refer to Figure 2 , Figure 3 and Figure 4 According to some embodiments of the present invention, the bending segment 1221 may include a first bending segment 1221a and a second bending segment 1221b, that is, the conductive element 122 can be housed in the mounting cavity 111 by bending twice.

[0053] The conductive component 122 also includes a gathering section 1223 and a connecting section 1224. The gathering section 1223 is connected to the battery cell body 121 and the first bending section 1221a respectively. The first bending section 1221a and the second bending section 1221b are connected through the connecting section 1224. The second bending section 1221b is welded to the terminal post 130, and the tail 1222 is located in the second bending section 1221b.

[0054] As mentioned earlier, whether it is the wound-core type or the stacked-core type of the cell body 121, multiple tabs are led out from the end of the cell body 121 facing the terminal post 130. The multiple tabs are stacked to form a conductive element 122. Through the converging section 1223, the conductive element 122 gradually converges when it extends to the first section, which helps to improve the structural stability of the conductive element 122. At the same time, it increases the current concentration on the conductive element 122 and reduces the energy loss caused by current dispersion, thereby improving the rate performance of the battery 100.

[0055] By using the converging section 1223, the first section, the bending section, and the second section, the conductive component 122 is formed into a continuous, seamless integral structure, which helps to reduce stress concentration on the conductive component 122 and extend its service life.

[0056] The first bending segment 1221a, the gathering segment 1223, and a portion of the cell body 121 define a first bending groove 1225, and the first bending segment 1221a, the connecting segment 1224, and the second bending segment 1221b define a second bending groove 1226.

[0057] The bending of the conductive element 122 forms the first bending groove 1225 and the second bending groove 1226, which further optimizes the bending structure of the conductive element 122, enhances the flexibility of the conductive element 122, and can effectively alleviate the stress caused by temperature changes or vibrations during the use of the battery 100, and prevent the conductive element 122 from breaking.

[0058] refer to Figure 2 , Figure 3 and Figure 4 Furthermore, the opening directions of the first bending groove 1225 and the second bending groove 1226 are opposite. Thus, the bending structure of the conductive element 122 forms an "S"-shaped bend, which helps to disperse stress in the conductive element 122. When the battery 100 is subjected to external force or temperature changes, the stress can be further buffered and released through the synergistic effect of the two bending grooves, improving the fatigue resistance of the conductive element 122 and extending its service life.

[0059] In some embodiments, the conductive element 122 may include multiple stacked tabs, which are flush with each other at the tail 1222. This improves the overall integrity of the conductive element 122, strengthens the binding force between the multiple tabs at the tail 1222, and makes the structure more uniform. This helps to avoid situations such as poor soldering or desoldering, and prevents the tail 1222 of the conductive element 122 from being inserted backwards into the cell body 121, thereby improving the safety of the battery 100.

[0060] In some embodiments, the conductive element 122 includes multiple stacked tabs, which are staggered at the tail 1222. This results in a more uniform interlayer arrangement of the tabs, providing a larger heat dissipation area. During welding between the conductive element 122 and the terminal post 130, heat can be distributed more evenly, preventing damage to the conductive element 122 due to localized overheating. Simultaneously, the reasonable interlayer distribution of the tabs helps coordinate the tension on the second section, preventing excessive tension within the conductive element 122 that could cause tearing at the welding point between the second section and the terminal post 130, thus improving the structural reliability of the battery 100.

[0061] refer to Figure 2 In some embodiments, the battery 100 may also include a mounting bracket 140, which is fixedly mounted in the mounting hole. Exemplarily, the mounting bracket 140 may be a metal or non-metal part, and the mounting bracket 140 may be fixedly mounted in the mounting hole by means of screws or other connectors or adhesives.

[0062] The terminal 130 is fixedly mounted to the mounting bracket 140. For example, the terminal 130 can be fixedly mounted to the mounting bracket 140 by an interference fit, or the terminal 130 can be fixedly mounted to the mounting bracket 140 by an adhesive. In this way, the mounting bracket 140 is fixedly mounted to the mounting hole, which can provide stable support for the terminal 130, ensuring that the terminal 130 will not shift or shake during the use of the battery 100, and ensuring the stability of the welding between the conductive component 122 and the terminal 130.

[0063] The terminal post 130 is insulated from the housing assembly. Exemplarily, the terminal post 130 may be insulated from the mounting bracket 140, for example, by applying insulating adhesive to the contact surfaces of the terminal post 130 and the mounting bracket 140. Alternatively, the mounting bracket 140 may be an insulating element to insulate the terminal post 130 from the housing assembly. Alternatively, the contact surfaces of the mounting bracket 140 and the housing assembly may be provided with insulating adhesive, and the surface of the mounting bracket 140 facing the housing assembly may be provided with an insulating element to insulate the terminal post 130 from the housing assembly.

[0064] In this way, by making the terminal 130 relatively insulated from the housing assembly, short circuits between the terminal 130 and the housing assembly are avoided, which helps to improve the safety of the battery 100.

[0065] refer to Figure 2 In some embodiments, a partition 150 is provided within the mounting cavity 111, separating the terminal post 130 from the cell assembly 120. The partition 150 has through-holes through which the conductive element 122 passes and is welded to the terminal post 130. The partition 150 separates the terminal post 130 from the cell assembly 120, reducing mutual interference and preventing direct contact between the cell assembly 120 and the terminal post 130, which could cause a short circuit. The through-holes in the partition 150 provide positioning and constraint for the conductive element 122, ensuring accurate relative positioning between the conductive element 122 and the terminal post 130. This improves welding precision and quality, and further enhances the stability of the internal structure of the battery 100.

[0066] Secondly, embodiments of this application also provide an electrical device, including the battery 100 described above.

[0067] For example, the electrical equipment may be equipped with an energy storage compartment, and the battery 100 may be installed in the energy storage compartment and connected to the internal circuit of the electrical equipment.

[0068] Optionally, the battery 100 of this utility model can supply power to the electrical equipment alone, or multiple batteries 100 can be connected in series or in parallel to form an energy storage device, which supplies power to the electrical equipment.

[0069] The electrical device of this application, by using the aforementioned battery 100, improves the connection stability between the terminal 130 and the conductive element 122. At the same time, the battery 100 has sufficient energy density to provide a stable and efficient energy supply for the electrical device, extend the battery life of the electrical device, reduce the risk of damage to the electrical device due to battery 100 failure, and improve the overall performance of the electrical device.

[0070] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0071] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery (100) characterized in that, include: A housing (110) defines a mounting cavity (111) within the housing (110), and the housing (110) is provided with a mounting hole communicating with the mounting cavity (111) along a first direction; The battery cell assembly (120) includes: The battery cell body (121) is disposed in the mounting cavity (111). A conductive element (122) is disposed in the mounting cavity (111), the conductive element (122) is connected to the battery cell body (121), and the conductive element (122) has at least one bent segment (1221) formed by bending. A pole post (130) is disposed in the mounting hole. The end face of the pole post (130) facing the mounting cavity (111) is welded to the bent section (1221) to form a welding area (122a). The portion of the bent section (1221) outside the welding area (122a) forms a connecting area (122b). The thickness T of the connecting area (122b) along the first direction satisfies: 0.2mm≤T≤0.9mm.

2. The battery (100) according to claim 1, characterized in that The width D1 of the conductive element (122) along the second direction satisfies: 10mm≤D1≤20mm.

3. The battery (100) of claim 1, wherein, The conductive element (122) forms a tail (1222) at the end away from the battery cell body (121). Along the third direction, the distance D2 between the welding area (122a) and the tail (1222) satisfies: 2mm≤D2≤6mm.

4. The battery (100) according to claim 3, characterized in that The bending section (1221) includes a first bending section (1221a) and a second bending section (1221b). The conductive element (122) further includes a closing section (1223) and a connecting section (1224). The closing section (1223) is connected to the battery cell body (121) and the first bending section (1221a) respectively. The first bending section (1221a) and the second bending section (1221b) are connected through the connecting section (1224). The second bent section (1221b) is welded to the pole post (130), and the tail (1222) is located in the second bent section (1221b). The first bending segment (1221a), the gathering segment (1223), and a portion of the cell body (121) define a first bending groove (1225), and the first bending segment (1221a), the connecting segment (1224), and the second bending segment (1221b) define a second bending groove (1226).

5. The battery (100) according to claim 4, characterized in that The opening direction of the first bending groove (1225) is opposite to that of the second bending groove (1226).

6. The battery (100) of claim 4, wherein, The conductive element (122) includes a plurality of stacked tabs, which are flush with each other at the tail (1222).

7. The battery (100) of claim 4, wherein, The conductive element (122) includes a plurality of stacked tabs, which are staggered at the tail (1222).

8. The battery (100) according to any one of claims 1-7, characterized in that, Also includes: Mounting bracket (140), said mounting bracket (140) is fixedly mounted in said mounting hole, and / or, The pole (130) is insulated from the housing (110).

9. The battery (100) according to any one of claims 1-7, characterized in that, A partition (150) is provided inside the mounting cavity (111). The partition (150) separates the electrode post (130) from the cell assembly (120). A through hole is provided on the partition (150). The conductive element (122) passes through the through hole and is welded to the electrode post (130).

10. An electric device, characterized by The battery (100) includes any one of claims 1-9.

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