Battery cell and battery assembly

Abstract

The utility model discloses a kind of battery monomer and battery assembly, battery monomer includes: shell and electrode assembly, shell includes cover plate, cover plate is located in the side of shell along first direction and is equipped with pole, the outer surface of cover plate is equipped with limit structure and limit structure is fixed relative to cover plate, limit structure and cover plate jointly define the limit space for accommodating limit connecting piece, the part of pole that protrudes from the outer surface of cover plate is located in limit space, electrode assembly is equipped in shell and is connected with pole. According to the battery monomer of the utility model embodiment, limit structure can limit connecting piece, can make connecting piece and battery monomer more convenient to connect and remove, improve assembly efficiency;And, when connecting piece is connected with integrated busbar, limit structure is fixed to connecting piece, prevent connecting piece rotating movement from causing the rotation of pole, improve the reliability of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery cell and a battery assembly. Background Technology

[0002] In battery packs, adjacent battery cells are typically electrically connected using connecting tabs, which need to be connected to the terminals of the battery cells. In related technologies, the connecting tabs are usually fixed to the terminals by welding. However, this connection method is cumbersome and reduces the assembly efficiency of the battery module. Furthermore, in battery packs, the battery cells located at the ends are connected to the integrated busbar via connecting tabs. When the connecting tabs are fixed to the integrated busbar, the connecting tabs may move or rotate along with the connector, potentially causing the terminals to rotate with the connecting tabs, leading to a decrease in the reliability of the battery cells. Therefore, improvements are needed. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one objective of this invention is to provide a battery cell that, by providing a limiting structure on the outer surface of a cover plate, defines a limiting space for accommodating a limiting connecting piece. When the battery cell is connected to the connecting piece, the connecting piece is inserted into the limiting space, and the limiting structure limits the connecting piece, making the connection and removal of the connecting piece from the battery cell easier and improving assembly efficiency. Furthermore, battery cells located at the edge are connected to an integrated busbar via the connecting piece. When connecting the connecting piece to the integrated busbar, the limiting structure fixes and limits the connecting piece, preventing rotation of the connecting piece and thus preventing rotation of the terminal post, thereby improving the reliability of the battery cell.

[0004] This utility model also proposes a battery assembly including the above-mentioned battery cells.

[0005] A battery cell according to a first aspect of the present invention includes: a housing, the housing including a cover plate, the cover plate being located on one side of the housing along a first direction and having an electrode post, the outer surface of the cover plate having a limiting structure and the limiting structure being fixed relative to the cover plate, the limiting structure and the cover plate jointly defining a limiting space for accommodating a limiting connecting piece, the portion of the electrode post protruding from the outer surface of the cover plate being located within the limiting space, and each electrode post being provided with the limiting structure; and an electrode assembly disposed within the housing and connected to the electrode post.

[0006] According to the battery cell of this utility model embodiment, by providing a limiting structure on the outer surface of the cover plate, the limiting structure and the cover plate together define a limiting space for accommodating the limiting connecting piece. When the battery cell is connected to the connecting piece, the connecting piece is inserted into the limiting space, and the limiting structure can limit the connecting piece, making the connection and removal of the connecting piece and the battery cell easier and improving assembly efficiency. Furthermore, the battery cell located at the edge is connected to the integrated busbar through the connecting piece. When the connecting piece is connected to the integrated busbar, the limiting structure fixes and limits the connecting piece, preventing the rotation of the connecting piece from causing the rotation of the terminal post, thereby improving the reliability of the battery cell.

[0007] According to some embodiments of the present invention, the limiting structure includes a limiting bracket, the limiting bracket includes a first limiting part and a second limiting part, the first limiting part is fixed to the cover plate and located on the outer periphery of the pole post, the second limiting part is connected to the end of the first limiting part away from the cover plate and extends toward the pole post in a second direction, the second limiting part is opposite to the cover plate and spaced apart, the first limiting part, the second limiting part and the cover plate together define the limiting space, and the second direction intersects with the first direction.

[0008] According to some embodiments of the present invention, the surface of the second limiting part facing the cover plate is a limiting surface, and the limiting surface is provided with a protrusion. The protrusion is used to press against the connecting piece, or the connecting piece is provided with a groove that cooperates with the protrusion.

[0009] According to some embodiments of this utility model, the protruding surface is spherical.

[0010] According to some embodiments of the present invention, each of the limiting structures includes two limiting brackets, the two limiting brackets being located on opposite sides of the corresponding pole post, and each limiting bracket including a first limiting part and a second limiting part; or, each of the limiting structures includes one limiting bracket, the limiting bracket including two first limiting parts and one second limiting part, the second limiting part being connected between the two first limiting parts.

[0011] According to some embodiments of the present invention, the two pole posts disposed on the cover plate are arranged at intervals along the second direction, and the two limiting brackets of the limiting structure are located on opposite sides of the corresponding pole posts along the second direction, and the second direction intersects with the first direction.

[0012] According to some embodiments of the present invention, the second limiting portion has a notch formed in the middle of the third direction, and the first direction, the second direction and the third direction intersect each other.

[0013] According to some embodiments of the present invention, the limiting structure is integrally formed with at least a portion of the cover plate.

[0014] According to some embodiments of the present invention, the cover plate includes a cover plate body and an insulating layer. The insulating layer is located inside the cover plate body. The limiting structure is connected to the insulating layer and integrally formed with the insulating layer. The cover plate body is provided with a clearance hole for avoiding the limiting structure.

[0015] A battery assembly according to a second aspect of the present invention includes: a plurality of battery cells arranged along a third direction, wherein the battery cells are battery cells according to a first aspect of the present invention; a plurality of connecting pieces, wherein a portion of the connecting pieces is accommodated within the limiting space and abuts against the terminal post, the plurality of connecting pieces including at least one first connecting piece and a second connecting piece, wherein the first connecting piece connects the terminal post of two adjacent battery cells, one end of the second connecting piece is connected to the terminal post of the battery cell located at the end in the third direction of the battery assembly, and the other end of the second connecting piece is used to connect to an integrated busbar.

[0016] According to the battery assembly of the present invention, by including the battery cell according to the first aspect of the present invention, the connection and removal of the connecting piece and the battery cell can be made simpler, and the assembly efficiency can be improved; furthermore, the battery cell located at the edge is connected to the integrated busbar through the second connecting piece. When the second connecting piece is connected to the integrated busbar, the limiting structure fixes and limits the second connecting piece to prevent the rotation of the second connecting piece from causing the pole to rotate, thereby improving the reliability of the battery cell.

[0017] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model 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 perspective view of a battery assembly according to some embodiments of the present invention; Figure 2 yes Figure 1 A three-dimensional schematic diagram of a single battery cell; Figure 3 yes Figure 2 The main view of a single battery cell; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 yes Figure 1 A three-dimensional schematic diagram of the connecting piece in the middle; Figure 6 This is a simplified schematic diagram of a battery device according to some embodiments of the present invention; Figure 7 This is a simplified schematic diagram of an electrical device according to some embodiments of the present invention.

[0019] Figure label: 100. Electrical device; 101. Battery device; 102. Battery assembly; 103. Individual battery cell; 104. Housing; 1. Shell; 11. Cover plate; 111. Cover plate body; 1111. Clearance hole; 2. Pole post; 3. Limiting structure; 31. Limiting space; 32. Limiting bracket; 321. First limiting part; 322. Second limiting part; 3221. Limiting surface; 3222. Protrusion; 3223. Notch; 5. Connecting piece; 50. Groove; 51. First connecting piece; 52. Second connecting piece. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] The following is for reference. Figures 1-7 The battery cell 103 according to an embodiment of the present utility model is described.

[0022] According to a first aspect of the present invention, a battery cell 103 includes a housing 1 and an electrode assembly.

[0023] Reference Figures 1-4 The housing 1 includes a cover plate 11, which is located on one side of the housing 1 along a first direction (e.g., the e1 direction in the figure) and is provided with an electrode post 2. The outer surface of the cover plate 11 is provided with a limiting structure 3 and the limiting structure 3 is fixed relative to the cover plate 11. The limiting structure 3 and the cover plate 11 together define a limiting space 31 for accommodating the limiting connecting piece 5. The part of the electrode post 2 protruding from the outer surface of the cover plate 11 is located in the limiting space 31. The electrode assembly is located in the housing 1 and connected to the electrode post 2. The limiting structure 3 is a non-conductive component, and each electrode post 2 is provided with a limiting structure 3.

[0024] For example, the first direction is the height direction of the shell 1.

[0025] For example, the cover plate 11 is provided with two pole posts 2, which are arranged at intervals along the second direction (e.g., the e2 direction in the attached figure). The two pole posts 2 are positive pole post 2 and negative pole post 2, respectively. The outer surface of the cover plate 11 is provided with two limiting structures 3, which together with the cover plate 11 define two limiting spaces 31. The positive pole post 2 and the negative pole post 2 are respectively accommodated in the two limiting spaces 31. The second direction intersects with the first direction.

[0026] For example, the second direction is the length direction of the housing 1; another example is that the second direction can be the width direction of the housing 1.

[0027] For example, the limiting structure 3 includes a frame and an insulating part, wherein the frame is a metal part and the insulating part is an insulating part, and the insulating part is sleeved on the outer periphery of the frame. This allows the insulating part of the limiting structure 3 to contact the connecting piece 5 when the battery cell 103 is connected to the connecting piece 5, preventing the connecting piece 5 from transferring electricity to the limiting structure 3 and causing dangers such as short circuits and leakage.

[0028] For example, the limiting structure 3 is made of polyethylene (PE); or, for another example, it is made of polyamide (PA). By making the limiting structure 3 a non-conductive component, the limiting structure 3 and the connecting piece 5 can be insulated, preventing the current on the connecting piece 5 from being transmitted to the limiting structure 3, which could lead to leakage or short circuit hazards.

[0029] For example, the limiting structure 3 can be connected to the cover plate 11 by welding; or, for another example, the limiting structure 3 can be integrally formed with the cover plate 11.

[0030] For example, when connecting the battery cell 103 to the connecting piece 5, the connecting piece 5 is inserted into the limiting space 31, the limiting structure 3 limits the connecting piece 5, and the connecting piece 5 and the pole post 2 abut against each other in the first direction, without the need for welding connection operation in related technologies; when removing the battery cell 103 from the connecting piece 5, the connecting piece 5 can be directly removed from the limiting space 31.

[0031] By providing a limiting structure 3 on the outer surface of the cover plate 11, the limiting structure 3 and the cover plate 11 together define a limiting space 31 for accommodating the limiting connecting piece 5. When the battery cell 103 is connected to the connecting piece 5, the connecting piece 5 is inserted into the limiting space 31. The limiting structure 3 can limit the connecting piece 5, which makes the connection and removal of the connecting piece 5 and the battery cell 103 easier and improves assembly efficiency.

[0032] Furthermore, since the connecting piece 5 and the terminal post 2 in the related technology are connected by welding, when the connecting piece 5 needs to be maintained or disassembled, it is necessary to first peel the connecting piece 5 off the terminal post 2, and then grind the surface of the terminal post 2 to remove residual solder before subsequent re-welding. This operation is complex, difficult to maintain, and prone to short circuits due to improper operation. By using the limiting structure 3 and the cover plate 11 to jointly define a limiting space 31 for accommodating and limiting the connecting piece 5, the limiting structure 3 limits the connecting piece 5. During the process of removing the connecting piece 5 from the battery cell 103, the connecting piece 5 can be directly pulled out from the limiting space 31, eliminating the need for grinding and solder removal operations as in the related technology, thus reducing the risk of short circuits caused by improper operation.

[0033] Furthermore, in the welding process between the connecting piece 5 and the pole post 2 in related technologies, because the materials of the connecting piece 5 and the pole post 2 are not completely the same, their coefficients of thermal expansion are inconsistent, resulting in abnormal cracks in the weld, reducing the contact area between the connecting piece 5 and the pole post 2, and reducing the current carrying capacity. By having the limiting structure 3 and the cover plate 11 jointly define a limiting space 31 for accommodating and limiting the connecting piece 5, the limiting structure 3 limits the connecting piece 5, eliminating the need for the welding process in related technologies, avoiding the problem of reduced contact area between the connecting piece 5 and the pole post 2, and ensuring sufficient current carrying capacity between the connecting piece 5 and the pole post 2.

[0034] On the other hand, in the battery assembly 102, the battery cell 103 located at the end is connected to the integrated busbar via a connecting piece 5. That is, one end of the connecting piece 5 is connected to the terminal post 2 of the battery cell 103, and the other end is connected to the integrated busbar, so that the connecting piece 5 and the integrated busbar are fixedly connected by fasteners such as screws. Since the connecting piece 5 and the terminal post 2 are connected by welding in the related technology, when the other end of the connecting piece 5 is fastened to the integrated busbar, the personnel rotate the fastener, and the connecting piece 5 moves or rotates with the fastener, causing the terminal post 2 to rotate with the connecting piece 5. By having the limiting structure 3 and the cover plate 11 jointly define a limiting space 31 for accommodating the limiting connecting piece 5, the limiting structure 3 limits the connecting piece 5. When the connecting piece 5 is connected to the integrated busbar, the limiting structure 3 fixes and limits the connecting piece 5, preventing the connecting piece 5 from rotating and causing the terminal post 2 to rotate, thereby improving the reliability of the battery cell 103. Furthermore, without the welding process in related technologies, the connecting piece 5 and the terminal post 2 can move relative to each other, further preventing the terminal post 2 from rotating with the connecting piece 5, thus improving the reliability of the battery cell 103.

[0035] According to the embodiment of the present invention, the battery cell 103 has a limiting structure 3 on the outer surface of the cover plate 11. The limiting structure 3 and the cover plate 11 together define a limiting space 31 for accommodating the limiting connecting piece 5. When the battery cell 103 is connected to the connecting piece 5, the connecting piece 5 is inserted into the limiting space 31. The limiting structure 3 can limit the connecting piece 5, making the connection and removal of the connecting piece 5 and the battery cell 103 easier and improving assembly efficiency. Furthermore, the battery cell 103 located at the edge is connected to the integrated busbar through the connecting piece 5. When the connecting piece 5 is connected to the integrated busbar, the limiting structure 3 fixes and limits the connecting piece 5, preventing the connecting piece 5 from rotating and moving, which would cause the terminal post 2 to rotate, thus improving the reliability of the battery cell 103.

[0036] Reference Figure 2 and Figure 4 According to some embodiments of the present invention, the limiting structure 3 includes a limiting bracket 32, which includes a first limiting part 321 and a second limiting part 322. The first limiting part 321 is fixed to the cover plate 11 and located on the outer periphery of the pole post 2. The second limiting part 322 is connected to the end of the first limiting part 321 away from the cover plate 11 and extends toward the pole post 2 in a second direction. The second limiting part 322 is opposite to the cover plate 11 in the first direction and is spaced apart. The first limiting part 321, the second limiting part 322 and the cover plate 11 together define the limiting space 31. The second direction intersects with the first direction.

[0037] For example, the second direction can be the width direction of the housing 1; another example is that the second direction can be the length direction of the housing 1.

[0038] For example, the limiting structure 3 may include a limiting bracket 32; or, for another example, the limiting structure 3 may include multiple limiting brackets 32, which are arranged at intervals along the circumferential direction of the pole post 2.

[0039] For example, a limiting bracket 32 ​​may include a first limiting part 321 and a second limiting part 322; as another example, a limiting bracket 32 ​​may include two first limiting parts 321 and a second limiting part 322, with the second limiting part 322 connected between the two first limiting parts 321.

[0040] In some specific embodiments of the present invention, the battery assembly 102 includes a plurality of battery cells 103, which are arranged along a third direction. The limiting structure 3 includes a limiting bracket 32, which includes a first limiting part 321 and a second limiting part 322. The limiting brackets 32 of the plurality of battery cells 103 are all located on the same side of the pole post 2 along the second direction.

[0041] In other specific embodiments of the present invention, the battery assembly 102 includes a plurality of battery cells 103 arranged along a third direction. The limiting structure 3 includes a limiting bracket 32, which includes a first limiting part 321 and a second limiting part 322. In two adjacent battery cells 103 arranged along the third direction, the limiting bracket 32 ​​of one battery cell 103 is located on one side of the terminal post 2 along the second direction, and the limiting bracket 32 ​​of the other battery cell 103 is located on the other side of the terminal post 2 along the second direction. When two adjacent battery cells 103 are connected by a connecting piece 5, the connecting piece 5 can be limited on both sides along the second direction, preventing the connecting piece 5 from falling off the battery cell 103 on one side along the second direction, thus making the limiting bracket 32 ​​more sufficient in limiting the connecting piece 5.

[0042] For example, the third direction can be the width direction of the battery cell 103; another example is the length direction of the battery cell 103.

[0043] By including a first limiting part 321 in the limiting structure 3, which is fixed to the cover plate 11 and located on the outer periphery of the pole post 2, the limiting structure 3 and the cover plate 11 can be fully connected, and interference between the first limiting part 321 and the pole post 2 can be avoided, thus preventing the first limiting part 321 from affecting the installation of the pole post 2. Furthermore, the battery cell 103 located at the edge is connected to the integrated busbar through the connecting piece 5. When the connecting piece 5 is connected to the integrated busbar, the first limiting part 321 can fix and limit the connecting piece 5, preventing the pole post 2 from rotating due to the rotation of the connecting piece 5, thereby improving the reliability of the battery cell 103.

[0044] By including a second limiting part 322 in the limiting structure 3, the second limiting part 322 is connected to the end of the first limiting part 321 away from the cover plate 11 and located on the side of the first limiting part 321 close to the pole post 2. When the battery cell 103 is connected to the connecting piece 5, the second limiting part 322 can limit the connecting piece 5, press the connecting piece 5 onto the pole post 2, so that the connecting piece 5 and the pole post 2 are in full contact.

[0045] Reference Figure 4According to some embodiments of this utility model, the surface of the second limiting part 322 facing the cover plate 11 is a limiting surface 3221. The limiting surface 3221 is provided with a protrusion 3222, which is used to press against the connecting piece 5, or the connecting piece 5 is provided with a groove 50 that cooperates with the protrusion 3222. By providing a protrusion 3222 on the limiting surface 3221, when the battery cell 103 is connected to the connecting piece 5, the protrusion 3222 can press against the connecting piece 5, so that the limiting structure 3 can more fully limit the connecting piece 5. By providing a groove 50 that cooperates with the protrusion 3222 on the connecting piece 5, when the connecting piece 5 is connected to the battery cell 103, the protrusion 3222 is accommodated in the groove 50, so that the protrusion 3222 can more fully limit the connecting piece 5, and prevent the connecting piece 5 from sliding out of the limiting space 31 in a third direction (e.g., the e3 direction in the figure), which would cause the contact between the connecting piece 5 and the terminal post 2 to fail. For example, the third direction is the arrangement direction of multiple battery cells 103.

[0046] For example, the third direction can be the width direction of housing 1; another example is that the third direction can be the length direction of housing 1.

[0047] Reference Figure 4 According to some embodiments of this utility model, the surface of the protrusion 3222 is spherical. By making the surface of the protrusion 3222 spherical, the installation difficulty of the connecting piece 5 can be reduced.

[0048] For example, the surface of the second limiting part 322 facing the cover plate 11 is a limiting surface 3221. The limiting surface 3221 is provided with a protrusion 3222. The surface of the protrusion 3222 is spherical. The connecting piece 5 is provided with a groove 50. The surface of the groove 50 is a spherical surface with the same diameter as the protrusion 3222. When the connecting piece 5 is connected to the battery cell 103, the protrusion 3222 is accommodated in the groove 50.

[0049] For example, refer to Figure 4 and Figure 5 The second limiting part 322 is provided with multiple protrusions 3222, and the connecting piece 5 is provided with multiple grooves 50. The number of grooves 50 is the same as the number of protrusions 3222 and they correspond one-to-one. When the connecting piece 5 is connected to the battery cell 103, each protrusion 3222 is accommodated in the corresponding groove 50. When connecting the connecting piece 5 to the battery cell 103, the connecting piece 5 is moved along a third direction, and the end of the connecting piece 5 contacts the protrusion 3222. As the connecting piece 5 continues to move, the spherical surface of the protrusion 3222 contacts the end of the connecting piece 5, and the second limiting part 322 is gradually pushed up by the connecting piece 5 until the bottom of the protrusion 3222 contacts the top of the connecting piece 5. The connecting piece 5 continues to move until the protrusion 3222 is accommodated in the groove 50, and the connecting piece 5 is connected to the battery cell 103.

[0050] Reference Figures 1-3According to some embodiments of the present invention, each limiting structure 3 includes two limiting brackets 32, which are located on opposite sides of the corresponding pole post 2. Each limiting bracket 32 ​​includes a first limiting part 321 and a second limiting part 322.

[0051] For example, each limiting structure 3 includes two limiting brackets 32, and each limiting bracket 32 ​​includes a first limiting part 321 and a second limiting part 322.

[0052] By equipping each pole post 2 with a limiting structure 3, the connecting piece 5 can be limited by the limiting structure 3 when connected to each pole post 2. By including two limiting brackets 32 in each limiting structure 3, with the two limiting brackets 32 located on opposite sides of the corresponding pole post 2, the limiting structure 3 can more fully limit the connecting piece 5, preventing the connecting piece 5 from falling off and causing the connecting piece 5 to detach from the pole post 2.

[0053] For example, two limiting brackets 32 are located on both sides of the corresponding pole post 2, and the second limiting parts 322 of the two limiting brackets 32 are connected.

[0054] According to some embodiments of the present invention, each limiting structure 3 includes a limiting bracket 32, the limiting bracket 32 ​​includes two first limiting parts 321 and a second limiting part 322, the second limiting part 322 being connected between the two first limiting parts 321.

[0055] For example, each limiting structure 3 includes a limiting bracket 32, which includes two first limiting parts 321 and a second limiting part 322. The two first limiting parts 321 are located on opposite sides of the pole post 2 along the second direction, and the second limiting part 322 is connected between the two first limiting parts 321.

[0056] By including a limiting bracket 32 ​​in each limiting structure 3, the limiting bracket 32 ​​includes two first limiting parts 321 and a second limiting part 322. The second limiting part 322 is connected between the two first limiting parts 321, which can more fully enhance the limiting effect of the limiting structure 3 on the connecting piece 5 and prevent the connecting piece 5 from falling off and causing the connecting piece 5 to detach from the pole post 2.

[0057] Reference Figures 1-3According to some embodiments of this utility model, two pole posts 2 on the cover plate 11 are arranged at intervals along a second direction, and two limiting brackets 32 of the limiting structure 3 are located on opposite sides of the corresponding pole posts 2 along the second direction, with the second direction intersecting the first direction. Since the two pole posts 2 on the cover plate 11 are arranged at intervals along the second direction, when connecting multiple battery cells 103, the multiple battery cells 103 will be arranged along a third direction, causing the connecting piece 5 to extend along the third direction to connect the pole posts 2 of adjacent battery cells 103 or to connect the pole posts 2 of battery cells 103 to the integrated busbar. By positioning the two limiting brackets 32 of the limiting structure 3 on opposite sides of the corresponding pole posts 2 along the second direction, interference between the limiting structure 3 and the connecting piece 5 can be avoided, facilitating the connection of the connecting piece 5 to the pole posts 2 of adjacent battery cells 103 or to the integrated busbar. The first direction, the second direction, and the third direction intersect each other.

[0058] Reference Figures 1-3 According to some embodiments of the present invention, a notch 3223 is formed in the middle of the second limiting part 322 along a third direction (e.g., direction e3 in the figure), and the first direction, the second direction, and the third direction intersect each other. By forming a notch 3223 in the middle of the second limiting part 322 along the third direction, the volume of the second limiting part 322 can be appropriately saved to reduce costs. Furthermore, the second limiting part 322 can be bent upward more easily, avoiding excessive installation force on the connecting piece 5 when it is connected to the battery cell 103, thus making the connecting piece 5 easier to install.

[0059] According to some embodiments of this utility model, at least a portion of the limiting structure 3 and the cover plate 11 are integrally formed. By making at least a portion of the limiting structure 3 and the cover plate 11 integrally formed, the connection between the limiting structure 3 and the cover plate 11 can be more sufficient, preventing the limiting structure 3 from falling off the cover plate 11 and causing the limiting structure 3 to fail in its limiting function on the connecting piece 5, which in turn leads to the failure of the connection between the connecting piece 5 and the pole post 2, thus ensuring a stable connection between the pole post 2 and the connecting piece 5.

[0060] Reference Figure 3 According to some embodiments of the present invention, the cover plate 11 includes a cover plate body 111 and an insulating layer. The insulating layer is located inside the cover plate body 111. The limiting structure 3 is connected to the insulating layer and integrally formed with the insulating layer. The cover plate body 111 is provided with a clearance hole 1111 for avoiding the limiting structure 3.

[0061] For example, the cover plate body 111 is made of steel or aluminum alloy; for example, the insulating layer is made of plastic or rubber.

[0062] For example, the limiting structure 3 includes a first limiting part 321 and a second limiting part 322, and the clearance hole 1111 can be used to avoid the first limiting part 321 of the limiting structure 3.

[0063] By making the cover plate 11 include a cover plate body 111 and an insulating layer, and the insulating layer is located inside the cover plate body 111, the components inside the battery can be insulated from the cover plate body 111, thus preventing conductive components inside the battery from transferring electricity to the cover plate 11 and causing dangers such as short circuits.

[0064] By connecting the limiting structure 3 to the insulating layer and molding it integrally with the insulating layer, the connection between the limiting structure 3 and the cover plate 11 can be made more complete, preventing the limiting structure 3 from falling off the cover plate 11 and causing the limiting structure 3 to fail in limiting the connecting piece 5, which in turn causes the connection between the connecting piece 5 and the pole post 2 to fail, thus ensuring a stable connection between the pole post 2 and the connecting piece 5.

[0065] By providing a clearance hole 1111 for the cover plate body 111 to avoid the limiting structure 3, the limiting structure 3 can be inserted through the clearance hole 1111 to protrude from the cover plate body 111 and limit the connecting piece 5.

[0066] For example, the limiting structure 3 includes a first limiting part 321 and a second limiting part 322. When manufacturing the limiting structure 3 and the cover plate 11, the limiting structure 3 and the insulating layer are first integrally injection molded, and the first limiting part 321 and the second limiting part 322 are both extended along the first direction. Then, the limiting structure 3 is inserted into the clearance hole 1111, and the insulating layer and the cover plate body 111 are connected by hot pressing or glue. Finally, the bending structure is used to bend the second limiting part 322 relative to the first limiting part 321 toward the direction where the pole post 2 is located.

[0067] For example, the limiting structure 3 is made of the same material as the insulating layer, and the limiting structure 3 and the insulating layer are integrally injection molded.

[0068] Reference Figure 1 According to a second aspect embodiment of the present invention, the battery assembly 102 includes: a plurality of battery cells 103 and a plurality of connecting pieces 5.

[0069] Multiple battery cells 103 are arranged along a third direction. The battery cells 103 are according to the first aspect of the present invention. A portion of the connecting piece 5 is accommodated in the limiting space 31 and abuts against the terminal post 2. The multiple connecting pieces 5 include at least one first connecting piece 51 and a second connecting piece 52. The first connecting piece 51 connects the terminal posts 2 of two adjacent battery cells 103. One end of the second connecting piece 52 is connected to the terminal post 2 of the battery cell 103 located at the end in the third direction of the battery assembly 102. The other end of the second connecting piece 52 is used to connect to the integrated busbar.

[0070] For example, two battery cells 103 are arranged along a third direction, and the multiple connecting pieces 5 include a first connecting piece 51, which connects the terminals 2 of two adjacent battery cells 103; or, for another example, three battery cells 103 are arranged along a third direction, and the multiple connecting pieces 5 include two first connecting pieces 51, which connect the terminals 2 of two adjacent battery cells 103.

[0071] For example, the second connecting piece 52 is connected to the integrated busbar by fasteners.

[0072] For example, connecting piece 5 can be an aluminum busbar; integrated busbar can be a copper busbar.

[0073] The battery cell 103 located at the edge is connected to the integrated busbar via the second connecting piece 52. The battery cell 103, according to the first aspect of the present invention, has a limiting structure 3 on the outer surface of the cover plate 11. When the second connecting piece 52 is connected to the integrated busbar, the limiting structure 3 fixes and limits the second connecting piece 52 to prevent the second connecting piece 52 from rotating and moving, which would cause the terminal post 2 to rotate, thereby improving the reliability of the battery cell 103.

[0074] According to the battery assembly 102 of the present invention, by including the battery cell 103 according to the first aspect of the present invention, the connection and removal of the connecting piece 5 and the battery cell 103 can be made simpler, and the assembly efficiency can be improved. In addition, the battery cell 103 located at the edge is connected to the integrated busbar through the second connecting piece 52. When the second connecting piece 52 is connected to the integrated busbar, the limiting structure 3 fixes and limits the second connecting piece 52 to prevent the rotation and movement of the second connecting piece 52 from causing the pole post 2 to rotate, thereby improving the reliability of the battery cell 103.

[0075] Reference Figure 6 The battery device 101 according to a third aspect of the present invention includes: a housing 104 and a battery assembly 102 according to a second aspect of the present invention, wherein the battery assembly 102 is disposed inside the housing 104.

[0076] According to the battery device 101 of the present invention, by including the battery assembly 102 according to the second aspect of the present invention, the connection and removal of the connecting piece 5 and the battery cell 103 can be made simpler, and the assembly efficiency can be improved; and, the rotation of the second connecting piece 52 can be prevented from causing the pole post 2 to rotate, thereby improving the reliability of the battery cell 103.

[0077] Reference Figure 7 The electrical device 100 according to the fourth aspect of the present invention includes: a battery device 101 according to the third aspect of the present invention.

[0078] According to the embodiment of the present invention, the electrical device 100, by including the battery device 101 according to the second aspect of the present invention, makes it easier to connect and disconnect the connecting piece 5 from the battery cell 103, thereby improving assembly efficiency; and can prevent the rotation of the second connecting piece 52 from causing the terminal post 2 to rotate, thereby improving the reliability of the battery cell 103.

[0079] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0080] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0081] In the description of this utility model, "multiple" means two or more.

[0082] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0083] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0084] 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 the present invention. 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.

[0085] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: The housing includes a cover plate located on one side of the housing along a first direction and provided with a pole post. The outer surface of the cover plate is provided with a limiting structure and the limiting structure is fixed relative to the cover plate. The limiting structure and the cover plate together define a limiting space for accommodating a limiting connecting piece. The portion of the pole post protruding from the outer surface of the cover plate is located within the limiting space. The limiting structure is a non-conductive component, and each pole post is provided with the limiting structure. An electrode assembly, which is disposed within the housing and connected to the electrode post.

2. The battery cell according to claim 1, characterized in that, The limiting structure includes a limiting bracket, which includes a first limiting part and a second limiting part. The first limiting part is fixed to the cover plate and located on the outer periphery of the pole post. The second limiting part is connected to the end of the first limiting part away from the cover plate and extends toward the pole post in a second direction. The second limiting part and the cover plate are opposite to each other and spaced apart in a first direction. The first limiting part, the second limiting part, and the cover plate together define the limiting space. The second direction intersects with the first direction.

3. The battery cell according to claim 2, characterized in that, The surface of the second limiting part facing the cover plate is a limiting surface, and the limiting surface is provided with a protrusion. The protrusion is used to press against the connecting piece, or the connecting piece is provided with a groove that cooperates with the protrusion.

4. The battery cell according to claim 3, characterized in that, The surface of the protrusion is spherical.

5. The battery cell according to claim 2, characterized in that, Each of the limiting structures includes two limiting brackets located on opposite sides of the corresponding pole post, and each limiting bracket includes a first limiting part and a second limiting part; or, each of the limiting structures includes one limiting bracket, which includes two first limiting parts and one second limiting part, with the second limiting part connected between the two first limiting parts.

6. The battery cell according to claim 5, characterized in that, The two pole posts on the cover plate are arranged at intervals along the second direction, and the two limiting brackets of the limiting structure are located on opposite sides of the corresponding pole posts along the second direction, and the second direction intersects the first direction.

7. The battery cell according to claim 6, characterized in that, The second limiting part has a notch formed in the middle of the third direction, and the first direction, the second direction and the third direction intersect each other.

8. The battery cell according to any one of claims 1-7, characterized in that, The limiting structure is integrally formed with at least a portion of the cover plate.

9. The battery cell according to claim 8, characterized in that, The cover plate includes a cover plate body and an insulating layer. The insulating layer is located inside the cover plate body. The limiting structure is connected to the insulating layer and integrally formed with the insulating layer. The cover plate body is provided with a clearance hole for avoiding the limiting structure.

10. A battery assembly, characterized in that, include: Multiple battery cells, wherein the multiple battery cells are arranged along a third direction, and the battery cells are battery cells according to any one of claims 1-9; Multiple connecting pieces, portions of which are accommodated within the limiting space and abut against the terminal posts, the multiple connecting pieces including at least one first connecting piece and a second connecting piece, the first connecting piece connecting the terminal posts of two adjacent battery cells, one end of the second connecting piece connecting to the terminal post of the battery cell located at the end in the third direction of the battery assembly, and the other end of the second connecting piece being used to connect to an integrated busbar.

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