A battery cell, a battery, and an electrical device.

Abstract

This application provides a battery cell, a battery, and an electrical device. The battery cell includes a housing with a first receiving cavity inside; an installation port communicating with the first receiving cavity is provided on the housing; an electrode assembly includes a connector and an electrode body, the connector being disposed at and covering the installation port of the housing; a cell assembly includes a cell body and a conductive portion; the cell body is housed in the first receiving cavity; one end of the conductive portion is electrically connected to the cell body, and the other end is electrically connected to the electrode body; the connection between the conductive portion and the electrode body forms a first electrical connection area, and when the conductive portion is in an unfolded state, the distance from the end of the conductive portion connecting to the cell body to the first electrical connection area is L, wherein 20mm≤L≤35mm. This application facilitates the welding of the conductive portion and the electrode body while preventing short circuits in the battery cell.

Description

Technical Field

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

[0002] Batteries are generally composed of multiple cells. As batteries are used more and more widely in various fields, the reliability and safety of batteries during production, manufacturing and use are becoming increasingly important.

[0003] In related technologies, when the tabs are connected to the terminals and the terminals are fixed to the cell housing by fasteners, it is easy to cause a short circuit in the cell. Utility Model Content

[0004] This application provides a battery cell, a battery, and an electrical device that facilitates the welding of the conductive part to the electrode body while preventing short circuits in the battery cell.

[0005] Firstly, embodiments of this application provide a single battery cell, comprising:

[0006] The housing has a first receiving cavity inside; the housing has an installation port communicating with the first receiving cavity;

[0007] The electrode assembly includes a connector disposed at and covering the mounting opening of the housing; the electrode assembly also includes an electrode body.

[0008] A battery cell assembly includes a battery cell body and a conductive portion; the battery cell body is housed in a first receiving cavity; one end of the conductive portion is electrically connected to the battery cell body, and the other end is electrically connected to the electrode body;

[0009] The connection between the conductive part and the electrode body forms a first electrical connection area. When the conductive part is in the unfolded state, the distance from the end of the conductive part that connects to the battery cell body to the first electrical connection area is L, where 20mm≤L≤35mm.

[0010] Secondly, embodiments of this application provide a battery, comprising,

[0011] The housing has a second receiving cavity;

[0012] One or more battery cells as described above, wherein one or more of the battery cells are housed within the second receiving cavity.

[0013] Thirdly, embodiments of this application provide an electrical device, including a battery cell as described above, or a battery as described above.

[0014] This application provides a battery cell, battery, and electrical device. When the conductive part is in the unfolded state, the distance L from the end of the conductive part connected to the cell body to the first electrical connection area is limited to the range of 20mm-35mm. This allows the conductive part located on the side of the mounting wall away from the first receiving cavity to have a certain length to meet the requirement of facilitating connection between the conductive part and the terminal body. At the same time, it minimizes the distance from the end of the conductive part connected to the cell body to the first electrical connection area, improving the stability of the conductive part and preventing the conductive part from being inserted upside down into the cell body during the installation of the connector into the housing and when the battery cell is in motion. Attached Figure Description

[0015] 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.

[0016] Figure 1 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application;

[0017] Figure 2 for Figure 1 A partial sectional view along the AA direction;

[0018] Figure 3 A first cross-sectional view of the conductive part in an unfolded state, welded to the electrode body, provided in some embodiments of this application;

[0019] Figure 4 A first partial cross-sectional view showing the welding connection between the conductive part and the electrode body in some embodiments of this application;

[0020] Figure 5 This is a second partial cross-sectional view showing the conductive part welded to the electrode body in some embodiments of this application;

[0021] Figure 6 This is a third partial cross-sectional view showing the conductive part welded to the electrode body in some embodiments of this application;

[0022] Figure 7 This is a fourth partial cross-sectional view showing the conductive part welded to the electrode body in some embodiments of this application;

[0023] Figure 8 A second cross-sectional view of the conductive part in an unfolded state, welded to the electrode body, provided in some embodiments of this application;

[0024] Figure 9 A third cross-sectional view of the conductive part in an unfolded state, welded to the electrode body, provided in some embodiments of this application;

[0025] Figure 10 This is a fifth partial cross-sectional view showing the conductive part welded to the electrode body in some embodiments of this application;

[0026] Figure 11 This is a sixth partial cross-sectional view showing the conductive part welded to the electrode body in some embodiments of this application.

[0027] Figure label:

[0028] 100. Housing; 101. First receiving cavity; 110. First sidewall; 111. Mounting wall; 111a. Connecting hole; 112. Mounting opening;

[0029] 200. Pole post assembly; 210. Connector; 211. Mounting hole; 220. Pole post body;

[0030] 300. Battery cell assembly; 310. Battery cell body; 320. Conductive part; 321. Electrode tab;

[0031] 400, First weld mark; 411, First sub-weld mark; 412, Second sub-weld mark;

[0032] 500, Second solder mark;

[0033] 600, bend; 610, first bend; 620, second bend.

[0034] 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

[0035] 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.

[0036] Batteries are generally composed of multiple cells. As batteries are used more and more widely in various fields, the reliability and safety of batteries during production, manufacturing and use are becoming increasingly important.

[0037] In related technologies, when the tabs are connected to the terminals and the terminals are fixed to the cell housing by fasteners, it is easy to cause a short circuit in the cell.

[0038] This application provides a battery cell, a battery, and an electrical device. When the conductive part is in the unfolded state, the distance L from the end of the conductive part connected to the cell body to the first electrical connection area is limited to the range of 20mm-35mm. This allows the conductive part located on the side of the mounting wall away from the first mounting cavity to have a certain length to meet the requirement of facilitating connection between the conductive part and the terminal body. At the same time, it minimizes the distance from the end of the conductive part connected to the cell body to the first electrical connection area, improving the stability of the conductive part and preventing the conductive part from being inserted upside down into the cell body during the installation of the connector into the casing and when the battery cell is in motion.

[0039] 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.

[0040] Firstly, see [the following] Figure 1 and Figure 2 As shown, this application provides a battery cell including a housing 100, a terminal assembly 200, and a cell assembly 300.

[0041] The interior of the housing 100 defines a first receiving cavity 101; the housing 100 has a first sidewall 110 along its height direction X, the first sidewall 110 includes a mounting wall 111, on which a connecting hole 111a is provided, the connecting hole 111a being disposed through the mounting wall 111.

[0042] In this embodiment of the application, an installation port 112 is provided on the first side wall 110 of the housing 100, and the installation port 112 communicates with the first receiving cavity 101; an installation wall 111 is provided on the side of the installation port 112 facing the first receiving cavity 101.

[0043] The electrode assembly 200 includes a connector 210 and an electrode body 220. The connector 210 has a mounting hole 211 that penetrates the connector 210, and the electrode body 220 is fixedly installed in the mounting hole 211. The electrode body 220 is made of metal, which gives it conductive properties.

[0044] The battery cell assembly 300 includes a battery cell body 310 and a conductive portion 320 electrically connected together. The battery cell body 310 is an active material coated portion. In this embodiment, the conductive portion 320 and the battery cell body 310 are integrally constructed. The conductive portion 320 is led out from one side of the battery cell body 310. The battery cell body 310 is coated with an active material, while the conductive portion 320 is not coated with an active material, so that the conductive portion 320 only serves to conduct electricity.

[0045] In this embodiment, the electrode assembly 200 is fixedly mounted on the first sidewall 110 via a connector 210, such that the connector 210 is located at and covers the connection port 112, and the electrode body 220 on the connector 210 is located on the side of the mounting wall 111 facing away from the first receiving cavity 101. The cell body 310 of the cell assembly 300 is housed in the first receiving cavity 101, and the conductive part 320 electrically connected on the cell body 310 passes through the mounting hole 211 on the mounting wall 111 and is electrically connected to the electrode body 220. That is, the conductive part 320 passing through the connection hole 111a has one end electrically connected to the cell body 310 and the other end electrically connected to the electrode body 220, thereby enabling an electrical connection to be formed between the cell body 310 and the electrode body 220.

[0046] Since the conductive part 320 is electrically connected to the electrode body 220, there is a first electrical connection area on the conductive part 320. Specifically, the conductive part 320 is in contact with the electrode body 220 through this first electrical connection area.

[0047] Understandably, during the assembly process, the battery cell body 310 of the cell assembly 300 is first placed in the first receiving cavity 101, and the conductive part 320 passes through the connection hole 111a. In this state, see... Figure 3 As shown, the conductive part 320 needs to be pulled in the direction Y away from the cell body 310 by external force so that the conductive part 320 is as far away from the first receiving cavity 101 as possible from the mounting wall 111. Then, the conductive part 320 is electrically connected to the electrode body 220 of the electrode assembly 200, and a first electrical connection area is formed on the conductive part 320. Finally, the connector 210 of the electrode assembly 200 is fixedly connected to the housing 100. During this process, the conductive part 320 between the cell body 310 and the first electrical connection area has a certain degree of freedom and will be bent.

[0048] The above analysis shows that, on the one hand, in the direction Y away from the cell body 310, on the side of the mounting wall 111 away from the first receiving cavity 101, the conductive part 320 needs to have the largest possible length to facilitate the electrical connection between the conductive part 320 and the terminal body 220, thereby improving the connection efficiency and accuracy between the conductive part 320 and the terminal body 220; on the other hand, in the direction Y away from the cell body 310, if the length of the conductive part 320 is as large as possible, the stability of the conductive part 320 will be poor during the process of fixing the connector 210 to the housing 100. The conductive part 320 is prone to being inserted into the cell body 310 during bending, which can easily cause a short circuit in the battery cell. Even if the conductive part 320 is not inserted into the cell body 310 during the assembly of the battery cell, there is still a risk that the conductive part 320 may be inserted into the cell body 310 during the use of the battery cell when the battery cell is in motion.

[0049] In view of the above, see Figure 3 and Figure 8 As shown in the embodiment of this application, the battery cell body 310 of the battery cell assembly 300 is placed in the first receiving cavity 101, and the conductive part 320 is passed through the connection hole 111a. Then, the conductive part 320 is pulled in the direction Y away from the battery cell body 310 by external force, so that the conductive part 320 is in a taut state and the length direction of the conductive part 320 is perpendicular to the battery cell body 310, that is, the conductive part 320 is in an unfolded state. The distance from the end of the conductive part 320 connected to the battery cell body 310 to the first electrical connection area is L, where 20mm≤L≤35mm.

[0050] In this embodiment, when the conductive part 320 is in the unfolded state, the distance L from the end of the conductive part 320 connected to the cell body 310 to the first electrical connection area is limited to the range of 20mm-35mm. This allows the conductive part 320 located on the side of the mounting wall 111 away from the first receiving cavity 101 to have a certain length to meet the requirement of connecting the conductive part 320 to the electrode body 220. At the same time, the distance from the end of the conductive part 320 connected to the cell body 310 to the first electrical connection area is minimized to improve the stability of the conductive part 320 and prevent the conductive part 320 from being inserted upside down into the cell body 310 during the process of installing the connector 210 into the housing 100 and when the battery cell is in motion.

[0051] In some embodiments, the side of the electrode body 220 near the first receiving cavity 101 is electrically connected to the conductive part 320 to realize the electrical connection between the electrode body 220 and the cell body 310.

[0052] In some embodiments, the first electrical connection region is located on the side of the inner surface of the housing 100 facing the cell body 310. For example, see... Figure 2 As shown, the first sidewall 110 has an inner surface facing the first receiving cavity 101, and the inner surface is located in plane B, wherein the first electrical connection area may be located on the side of plane B facing the cell body 310.

[0053] In some embodiments, the first electrical connection region is located on the side of the inner surface of the housing 100 facing away from the cell body 310. For example, see... Figure 2 As shown in the embodiment of this application, the first sidewall 110 has an inner surface facing the first receiving cavity 101, and the inner surface is located in plane B, wherein the first electrical connection area is located on the side of plane B away from the battery cell body 310.

[0054] In some embodiments, the shortest distance between the edge of the first electrical connection region and the edge of the pole body 220 is 3mm-100mm, so that the first electrical connection region is basically located in the middle of the pole body 220, thereby improving the stability of the first electrical connection region.

[0055] In some implementations, see Figure 6 and Figure 7 As shown, the first electrical connection area includes multiple electrical connection sub-regions, and the multiple electrical connection sub-regions can be spaced apart along the length direction of the conductive part 320, or spaced apart along the width direction of the conductive part 320, or spaced apart along both the length and width directions of the conductive part 320, without any particular limitation.

[0056] In this embodiment, the conductive portion 320 located on the side of the mounting wall 111 away from the first mounting cavity has a better length dimension. Therefore, multiple electrical connection sub-regions that are electrically connected to the pole body 220 can be formed on the conductive portion 320. The cooperation of multiple electrical connection sub-regions can improve the stability of the electrical connection between the conductive portion 320 and the pole body 220 and improve the connection strength between the conductive portion 320 and the pole body 220.

[0057] Further, see Figure 7 and Figure 8 As shown, when the conductive part 320 is in the unfolded state, the distance between the end of the conductive part 320 that connects to the cell body 310 and the electrical connection sub-region closest to the cell body 310 is L1.

[0058] It is worth mentioning that during the process of connecting the conductive part 320 and the electrode body 220, when the conductive part 320 is in the unfolded state, a first electrical connection sub-region can be formed on the conductive part 320 first. When the distance between the first electrical connection sub-region and the cell body 310 is greater than L1, a second electrical connection sub-region can be formed on the conductive part 320 and on the side of the first electrical connection sub-region close to the cell body 310. The distance between the second electrical connection sub-region and the cell body 310 is smaller, thereby gradually achieving a distance of L1 from the end of the conductive part 320 connected to the cell body 310 to the first electrical connection region.

[0059] Furthermore, in this embodiment of the application, the distance between the end of the conductive part 320 that connects to the cell body 310 and the electrical connection sub-region closest to the cell body 310 is L1, wherein 20mm≤L1≤30mm.

[0060] In some embodiments, the conductive part 320 and the electrode body 220 are connected by welding to achieve electrical connection between the conductive part 320 and the electrode body 220. Since the conductive part 320 is welded to the electrode body 220, the first electrical connection area is the first solder mark 400, and the corresponding plurality of electrical connection sub-areas are sub-solder marks. For example, the first electrical connection sub-area is the first sub-solder mark 411, and the second electrical connection sub-area is the second sub-solder mark 412.

[0061] In some implementations, see Figure 4 As shown, the conductive part 320 includes a plurality of stacked tabs 321, wherein the plurality of tabs 321 are connected by welding to form a second solder mark 500, and the plurality of tabs 321 are electrically connected to each other through the second solder mark 500.

[0062] Understandably, see Figures 3-8 As shown in the embodiment of this application, the conductive part 320 is welded to the electrode body 220 through at least a portion of the second solder mark 500 to form a first solder mark 400, thereby realizing the electrical connection between the conductive part 320 and the electrode body 220.

[0063] In some embodiments, at least a portion of the first solder mark 400 and the second solder mark 500 overlap in the stacking direction Z of the plurality of tabs 321.

[0064] It should be noted that the first solder mark 400 is formed within the area of ​​the second solder mark 500. When the area of ​​the first solder mark 400 is smaller than that of the second solder mark 500, see [reference needed]. Figures 3-8 As shown, a portion of the second solder mark 500 overlaps with the first solder mark 400. When the area of ​​the first solder mark 400 is equal to that of the second solder mark 500, the entire second solder mark 500 overlaps with the first solder mark 400.

[0065] In this embodiment, the area of ​​the first solder mark 400 is smaller than that of the second solder mark 500, and the first electrical connection region includes a plurality of spaced electrical connection sub-regions. That is, the first solder mark 400 includes a plurality of spaced sub-solder marks, such that a portion of the second solder mark 500 overlaps with the first solder mark 400.

[0066] In some implementations, see Figures 3-8 As shown, in the stacking direction Z of the multiple tabs 321, the second solder mark 500 covers the first solder mark 400, such that the area of ​​the first solder mark 400 is not greater than that of the second solder mark 500, so as to ensure the stability and safety of the welding between the conductive part 320 and the electrode body 220.

[0067] In some embodiments, the area ratio of the first solder mark 400 to the second solder mark 500 is 0.15-0.7, which ensures that the area of ​​the first solder mark 400 is not too small, making it easy to process and form. At the same time, it also ensures that the area of ​​the first solder mark 400 is not too large compared to the area of ​​the second solder mark 500, so as to avoid the electrode tab 321 being welded through during the process of forming the first solder mark 400. This can improve the efficiency of welding processing and enhance safety.

[0068] In some embodiments, see Figure 2 As shown, during the assembly of a battery cell, after the conductive part 320 is welded to the electrode body 220, the connector 210 is fixed to the housing 100. During this process, the conductive part 320 located between the cell body 310 and the first electrical connection area is bent to form at least two bends 600. The at least two bends 600 are spaced apart along the thickness direction of the mounting wall 111, and the openings of two adjacent bends 600 face different directions.

[0069] For example, in this embodiment of the application, the conductive part 320 forms a first groove 610 and a second groove 620 by bending. The first groove 610 and the second groove 620 are adjacent to each other and spaced apart in the thickness direction of the mounting wall 111, wherein the opening orientation of the first groove 610 is opposite to the opening orientation of the second groove 620.

[0070] It is understandable that the first groove 610 and the second groove 620 have a certain elasticity in the thickness direction of the mounting wall 111, which can press the end of the conductive part 320 away from the cell body 310 onto the electrode body 220, thereby enabling the first solder mark 400 to stably connect the conductive part 320 and the electrode body 220, and improve the stability of the connection.

[0071] Secondly, see Figure 1 and Figure 2 As shown, this application provides a battery cell including a housing 100, a terminal assembly 200, and a cell assembly 300.

[0072] The interior of the housing 100 defines a first receiving cavity 101; the housing 100 has a first sidewall 110 along its height direction X, the first sidewall 110 includes a mounting wall 111, on which a connecting hole 111a is provided, the connecting hole 111a being disposed through the mounting wall 111.

[0073] In this embodiment of the application, an installation port 112 is provided on the first side wall 110 of the housing 100, and the installation port 112 communicates with the first receiving cavity 101; an installation wall 111 is provided on the side of the installation port 112 facing the first receiving cavity 101.

[0074] The electrode assembly 200 includes a connector 210 and an electrode body 220. The connector 210 has a mounting hole 211 that penetrates the connector 210, and the electrode body 220 is fixedly installed in the mounting hole 211. The electrode body 220 is made of metal, which gives it conductive properties.

[0075] The battery cell assembly 300 includes a battery cell body 310 and a conductive portion 320 electrically connected together. The battery cell body 310 is an active material coated portion. In this embodiment, the conductive portion 320 and the battery cell body 310 are integrally constructed. The conductive portion 320 is led out from one side of the battery cell body 310. The battery cell body 310 is coated with an active material, while the conductive portion 320 is not coated with an active material, so that the conductive portion 320 only serves to conduct electricity.

[0076] In this embodiment, the electrode assembly 200 is fixedly mounted on the first sidewall 110 via a connector 210, such that the electrode body 220 on the connector 210 is located on the side of the mounting wall 111 facing away from the first receiving cavity 101. The cell body 310 of the cell assembly 300 is housed in the first receiving cavity 101, and the conductive portion 320 electrically connected on the cell body 310 passes through the mounting hole 211 on the mounting wall 111 and is electrically connected to the electrode body 220. That is, the conductive portion 320 passing through the connecting hole 111a has one end electrically connected to the cell body 310 and the other end electrically connected to the electrode body 220, thereby enabling an electrical connection between the cell body 310 and the electrode body 220. The conductive portion 320 located between the cell body 310 and the electrode body 220 is in a bent state.

[0077] Since the conductive part 320 is electrically connected to the electrode body 220, a first electrical connection region exists on the conductive part 320. Specifically, the conductive part 320 is in contact with the electrode body 220 through this first electrical connection region. See also... Figure 9 As shown in the embodiment of this application, the conductive part 320 is welded to the electrode body 220, so that the first electrical connection area is the first solder mark 400.

[0078] See Figure 9 As shown in the embodiment of this application, the penetration depth of the first solder mark 400 is H, wherein 0.2155mm≤H≤1.136mm.

[0079] Understandably, by limiting the penetration depth of the first weld mark 400 to the range of 0.2155mm-1.136mm, it is possible to avoid the conductive part 320 from being torn under stress during bending, and the conductive part 320 is prone to tearing if the penetration depth of the first weld mark 400 is too large, thus ensuring the connection strength between the conductive part 320 and the electrode body 220 and improving the stability of the connection. On the other hand, it is possible to avoid the first weld mark 400 from being too deep, thereby reducing the risk of the conductive part 320 being welded through during the actual welding operation.

[0080] In some implementations, see Figure 4 As shown, the conductive part 320 includes a plurality of stacked tabs 321, wherein the plurality of tabs 321 are connected by welding to achieve electrical connection between the plurality of tabs 321.

[0081] Further, see Figure 9 As shown in the embodiment of this application, the conductive part 320 has a certain thickness along the stacking direction Z of the plurality of tabs 321, wherein the ratio of the thickness dimension of the conductive part 320 to the thickness dimension of the electrode body 220 is 0.04-0.2.

[0082] It should be noted that when welding the conductive part 320 to the electrode body 220, excessive penetration of the first weld mark 400 may cause the conductive part 320 to be welded through. When the penetration depth of the first weld mark 400 remains constant, a larger thickness of the conductive part 320 results in a lower probability of it being welded through. Since the first weld mark 400 is formed not only on the conductive part 320 but also on the electrode body 220, it is necessary to consider the impact of the penetration depth of the first weld mark 400 on the structural strength of the electrode body 220 to avoid affecting its structural stability.

[0083] In this embodiment, by limiting the thickness of the conductive portion 320 and the thickness of the electrode body 220 to 0.04-0.2, the electrode body 220 has a larger thickness than the conductive portion 320, which can better prevent the first solder mark 400 from affecting the structural stability of the electrode body 220.

[0084] In some embodiments, the ratio of the thickness of the conductive portion 320 to the penetration depth of the first solder mark 400 is 0.55-0.9.

[0085] It is understandable that when the thickness of the conductive part 320 remains constant, there is a critical penetration depth for the first weld mark 400 when welding the conductive part 320 to the electrode body 220 without completely burning through the conductive part 320. The larger the thickness of the conductive part 320, the larger the critical penetration depth; conversely, the smaller the thickness of the conductive part 320, the smaller the critical penetration depth. Therefore, the thickness of the conductive part 320 and the critical penetration depth are directly proportional.

[0086] In this embodiment, regardless of the thickness of the conductive part 320, the ratio of the thickness of the conductive part 320 to the penetration depth of the first solder mark 400 is 0.55-0.9. This ensures that the first solder mark 400 has sufficient penetration depth while preventing the conductive part 320 from being soldered through, thereby ensuring the welding strength between the conductive part 320 and the electrode body 220.

[0087] In some implementations, the penetration depth of the first solder mark 400 is 0.5 mm to 0.9 mm.

[0088] See Figure 6 and Figure 7 As shown, in some embodiments, the first solder mark 400 includes a plurality of spaced-apart sub-solder marks. These sub-solder marks can be spaced apart along the length of the conductive portion 320, along the width of the conductive portion 320, or simultaneously along both the length and width directions of the conductive portion 320; there is no particular limitation in this regard. It is understood that the cooperation of the plurality of sub-solder marks can improve the stability of the electrical connection between the conductive portion 320 and the electrode body 220, and increase the connection strength between the conductive portion 320 and the electrode body 220.

[0089] For example, see Figure 7 , Figure 10 and Figure 11 As shown, the sub-solder mark in this embodiment includes a first sub-solder mark 411 and a second sub-solder mark 412. The first sub-solder mark 411 and the second sub-solder mark 412 are adjacent to each other, and the first sub-solder mark 411 is closer to the center of the first solder mark 400 than the second sub-solder mark 412.

[0090] Furthermore, the penetration depth of the first sub-weld 411 and the penetration depth of the second sub-weld 412 can be the same or different, and there is no particular limitation on this.

[0091] See Figure 10 As shown, in some embodiments, the penetration depth of the first sub-solder mark 411 is smaller than that of the second sub-solder mark 412.

[0092] It is understood that since the penetration depth of the first solder mark 400 is H, and 0.2155mm≤H≤1.136mm, and the first solder mark 400 includes multiple sub-solder marks, the penetration depth of each sub-solder mark is H. For example, in this embodiment of the application, the penetration depth of the first sub-solder mark 411 is H, and the penetration depth of the second sub-solder mark 412 is H.

[0093] As can be seen from the above analysis, the larger the penetration depth of the first solder mark 400, the greater the risk of the conductive part 320 being soldered through. Therefore, in this embodiment, the penetration depth of the first sub-solder mark 411 is set to be smaller than that of the second sub-solder mark 412. By increasing the penetration depth of the first sub-solder mark 411, which has a smaller penetration depth, the probability of the conductive part 320 being soldered through can be reduced.

[0094] It is worth mentioning that, since the second sub-weld 412 with a larger penetration depth is located near the outer edge of the first weld 400, while the first sub-weld 411 with a smaller penetration depth is located near the center of the first weld 400, the outer edge of the first weld 400 has a larger penetration depth. Therefore, it can better improve the connection strength between the conductive part 320 and the electrode body 220. In addition, the second sub-weld 412 can play a certain protective role for the first sub-weld 411, preventing the first weld 400 from being subjected to external forces, thereby improving the structural stability of the first weld 400 with a smaller penetration depth.

[0095] See Figure 11 As shown, in some embodiments, the penetration depth of the first sub-solder mark 411 is greater than that of the second sub-solder mark 412.

[0096] It is understood that since the penetration depth of the first solder mark 400 is H, and 0.2155mm≤H≤1.136mm, and the first solder mark 400 includes multiple sub-solder marks, the penetration depth of each sub-solder mark is H. For example, in this embodiment of the application, the penetration depth of the first sub-solder mark 411 is H, and the penetration depth of the second sub-solder mark 412 is H.

[0097] As can be seen from the above analysis, the larger the penetration depth of the first solder mark 400, the greater the risk of the conductive part 320 being soldered through. Therefore, in this embodiment, the penetration depth of the first sub-solder mark 411 is set to be greater than that of the second sub-solder mark 412. When the penetration depth of both the first sub-solder mark 411 and the second sub-solder mark 412 is within the range of 0.2155mm-1.136mm, by increasing the penetration depth of the second sub-solder mark 412, which has a smaller penetration depth, the probability of the conductive part 320 being soldered through can be reduced.

[0098] It is worth mentioning that, since the second sub-weld 412 with a smaller penetration depth is located near the outer edge of the first weld 400, while the first sub-weld 411 with a larger penetration depth is located near the center of the first weld 400, the center of the first weld 400 has a larger penetration depth, which can better improve the connection strength between the conductive part 320 and the electrode body 220.

[0099] In some implementations, the ratio of the penetration depth of two adjacent sub-solder marks is 0.85-1.15.

[0100] For example, in the embodiments of this application, the first sub-weld 411 and the second sub-weld 412 are located adjacent to each other. By limiting the ratio of the penetration depth of the first sub-weld 411 to the penetration depth of the second sub-weld 412 to 0.85-1.15, it is possible to avoid the penetration depth of the first sub-weld 411 and the penetration depth of the second sub-weld 412 being too different, thereby improving the stability of the mutual cooperation between the first sub-weld 411 and the second sub-weld 412 and improving the stability of the welding connection between the conductive part 320 and the electrode body 220.

[0101] Thirdly, the embodiments of this application provide a battery including the aforementioned battery cell, and therefore, it can possess the corresponding technical effects and advantages described above.

[0102] The battery in this embodiment of the application also includes a housing, the interior of which forms a second receiving cavity; the battery cells are housed in the second receiving cavity.

[0103] Furthermore, the number of battery cells can be set to multiple, with multiple battery cells simultaneously housed in the second receiving cavity, and the multiple battery cells interconnected by series or parallel connection.

[0104] Fourthly, the embodiments of this application provide an electrical device that includes the aforementioned battery cell or the aforementioned battery, and thus possesses the corresponding technical effects and advantages described above.

[0105] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures 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 utility model is limited only by the appended claims.

Claims

1. A battery cell, characterized by: include, The housing (100) has a first receiving cavity (101) inside; the housing (100) has an installation port (112) communicating with the first receiving cavity (101). The pole assembly (200) includes a connector (210) disposed at and covering the mounting port (112) of the housing (100); the pole assembly (200) also includes a pole body (220). The battery cell assembly (300) includes a battery cell body (310) and a conductive part (320); the battery cell body (310) is housed in the first receiving cavity (101); one end of the conductive part (320) is electrically connected to the battery cell body (310), and the other end is electrically connected to the terminal body (220). The connection between the conductive part (320) and the electrode body (220) forms a first electrical connection area. When the conductive part (320) is in the unfolded state, the distance from the end of the conductive part (320) connected to the battery cell body (310) to the first electrical connection area is L, where 20mm≤L≤35mm.

2. The battery cell of claim 1, wherein: The connector (210) is provided with a mounting hole (211), and the pole body (220) is provided at the mounting hole (211).

3. The battery cell of claim 1, wherein: The first electrical connection region includes a plurality of electrical connection sub-regions spaced apart along the length and / or width direction of the conductive portion (320); When the conductive part (320) is in the unfolded state, the distance between the end of the conductive part (320) that connects to the battery cell body (310) and the nearest electrical connector region is L1, where 20mm≤L1≤30mm.

4. The battery cell of claim 1, wherein: The pole body (220) is electrically connected to the conductive part (320) on the side near the first receiving cavity (101).

5. The battery cell of claim 1, wherein: The first electrical connection area is located on the side of the inner surface of the housing (100) facing the battery cell body (310).

6. The battery cell of claim 1, wherein: The first electrical connection area is located on the side of the inner surface of the housing (100) away from the battery cell body (310).

7. The battery cell according to claim 1, characterized in that: The shortest distance between the edge of the first electrical connection area and the edge of the pole body (220) is 3mm-10mm.

8. The battery cell of claim 1 or 3, wherein: The conductive part (320) is welded to the electrode body (220), and the first electrical connection area is the first solder mark (400).

9. The battery cell of claim 8, wherein: The conductive part (320) includes a plurality of stacked tabs (321); the plurality of tabs (321) are welded together to form a second solder mark (500).

10. The battery cell of claim 9, wherein: In the stacking direction of the plurality of tabs (321), the first solder mark (400) and the second solder mark (500) at least partially overlap.

11. The battery cell of claim 9 or 10, wherein: In the stacking direction of the plurality of said tabs (321), the second solder mark (500) covers the first solder mark (400).

12. The battery cell of claim 11, wherein: The area ratio of the first solder mark (400) to the area of ​​the second solder mark (500) is 0.15-0.

7.

13. The battery cell of claim 1 or 3, wherein: When the connector (210) is fixedly connected to the housing (100), the conductive part (320) is bent to form at least two grooves (600), the at least two grooves (600) are spaced apart, and the openings of two adjacent grooves (600) face different directions.

14. A battery, characterized by: include, The housing has a second receiving cavity; One or more battery cells as described in any one of claims 1-13, wherein the one or more battery cells are housed within the second receiving cavity.

15. An electrical device, comprising: It includes the battery cell as described in any one of claims 1-13, or the battery as described in claim 14.

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