Battery cell with improved lithium precipitation at the top and bottom of the core pack

Abstract

The utility model relates to a kind of battery core for improving lithium precipitation of top and bottom of core package.It relates to the technical field of new energy battery.The present application specifically includes the battery core shell with cavity, the battery core package loaded in cavity, the first binding tape in the top of battery core package, and the second binding tape in the bottom of battery core package;The first binding tape is circled in the outside of battery core package, to constrain the deformation of the top of battery core package, the second binding tape is circled in the outside of battery core package, to constrain the deformation of the bottom of battery core package.The utility model circled the first binding tape in the top of battery core package, to constrain the deformation of the top of battery core package, the second binding tape circled in the bottom of battery core package, to constrain the deformation of the bottom of battery core package, to prevent the gap of the top and bottom of core package too large, to improve the problem that negative electrode generates lithium precipitation in the top and bottom of battery core package, to ensure the performance of battery core.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to an improvement method for the top and bottom separation of the core pack.

[0002] Lithium-ion battery cells. Background Technology

[0003] As the industry develops, lithium-ion batteries are being used in increasingly diverse and complex applications. The requirements for lithium-ion batteries have evolved from a single capacity indicator to a comprehensive set of criteria including capacity, lifespan, safety, environmental adaptability, and high-rate charge / discharge performance. As the most crucial component of a lithium-ion battery, the performance of the battery cell directly determines its capacity, charge / discharge efficiency, and cycle life.

[0004] Commercially available battery cells are mainly classified into two categories based on their cell pack structure: stacked and wound. The stacked type involves layering the positive electrode, separator, negative electrode, separator, and positive electrode in a specific manner, then welding all the positive electrodes together to form a positive electrode tab, which is connected to the positive output terminal. Similarly, the negative electrodes are welded together to form a negative electrode tab, which is connected to the negative output terminal. The wound type involves placing the positive electrode membrane, separator, and negative electrode membrane sequentially and winding them into a square or other corresponding structure. The finished cell pack is then encased in an outer shell, such as an aluminum shell, steel shell, or thermoplastic aluminum-plastic packaging film, thus forming the battery cell.

[0005] However, existing battery cells, whether using stacked or wound cell packs, all suffer from the problem of electrolyte breakage due to excessively large gaps at the top and bottom of the cell pack. This leads to lithium plating at the negative electrode of the cell pack, thus affecting the performance of the battery cell.

[0006] For example, during the tab shaping process, the top edge of the core pack may expand slightly due to the action of external shaping equipment, resulting in gaps at the top edge of the core pack, forming local electrolyte breaks and causing lithium plating. During the use of the cell, the weight of the core pack itself may compress the separator at the bottom, causing gaps at the bottom edge of the core pack, forming local electrolyte breaks and causing lithium plating. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of the prior art by providing a battery cell that improves lithium plating at the top and bottom of the core package, thereby preventing excessive gaps at the top and bottom of the core package and improving the problem of lithium plating at the negative electrode at the top and bottom of the core package, thus ensuring the performance of the battery cell.

[0008] This utility model proposes a battery cell with improved lithium plating at the top and bottom of the core package, comprising a battery cell housing with an internal cavity, a battery cell core package loaded in the cavity, a first binding strap disposed at the top of the battery cell core package, and a second binding strap disposed at the bottom of the battery cell core package; the first binding strap is wrapped around the outside of the battery cell core package to constrain deformation at the top of the battery cell core package, and the second binding strap is wrapped around the outside of the battery cell core package to constrain deformation at the bottom of the battery cell core package.

[0009] Furthermore, both the first and second binding straps have a first bonding area at their first ends and a second bonding area at their second ends. The first and second bonding areas are located on the inner side of the first or second binding strap, and are used to bond the two ends of the first or second binding strap to the outer wall of the battery cell core package, respectively.

[0010] Furthermore, both the first and second binding straps have a first bonding area at their first ends and a second bonding area at their second ends. The first and second binding straps encircle the outer side of the battery cell package. The first bonding area is located on the outer side of the first or second binding strap, and the second bonding area is located on the inner side of the first or second binding strap. The first bonding area and the second bonding area are bonded to each other to connect the two ends of the first or second binding strap.

[0011] Furthermore, both the first and second binding straps have a first bonding area at their first ends and a second bonding area at their second ends. The first and second binding straps encircle the outer side of the battery cell package. The first and second bonding areas are located on the inner side of the first or second binding strap. The first bonding area is used to bond to the outer wall of the battery cell package, and the second bonding area is used to bond the two ends of the first or second binding strap.

[0012] Furthermore, the first end of the first cable tie and the second cable tie is provided with an adhesive marking area, which is located on the outside of the first cable tie or the second cable tie and is used to mark the adhesive position of the second adhesive area.

[0013] Furthermore, the top of the battery cell pack is provided with a first binding groove and the bottom is provided with a second binding groove, the first binding strap is provided in the first binding groove and the second binding strap is provided in the second binding groove.

[0014] Furthermore, both the first and second binding straps have multiple reinforcing ribs on their outer sides, and these reinforcing ribs are distributed at equal intervals along the outer wall of the first or second binding strap.

[0015] Furthermore, the battery cell housing is provided with a first limiting member and a second limiting member. When the battery cell is loaded into the cavity, the first limiting member limits the top of the battery cell and the second limiting member limits the bottom of the battery cell.

[0016] Furthermore, when the battery cell is packaged in the cavity, the first limiting member surrounds the outside of the first binding strap, and the second limiting member surrounds the outside of the second binding strap. Both the first limiting member and the second limiting member are provided with multiple insertion slots, and the multiple reinforcing ribs are respectively inserted into the multiple insertion slots.

[0017] Furthermore, the first limiting member is a rubber pad that surrounds the top inner wall of the cavity, and the second limiting member is a rubber pad that surrounds the bottom inner wall of the cavity.

[0018] The battery cell proposed in this utility model for improving lithium plating at the top and bottom of the core package has the following beneficial effects:

[0019] (1) The first binding strap around the top of the battery cell package constrains the deformation of the top of the battery cell package, and the second binding strap around the bottom of the battery cell package constrains the deformation of the bottom of the battery cell package, thereby preventing the gap between the top and bottom of the battery cell package from being too large, thereby improving the problem of lithium plating at the negative electrode at the top and bottom of the battery cell package and ensuring the performance of the battery cell.

[0020] (2) The bonding position of the second bonding area is marked by the bonding marking area of ​​the battery cell, which makes it easier and more convenient to set the first or second binding tape on the outside of the battery cell core package, thereby improving the practicality of the battery cell. It also makes the first or second binding tape wrapped more tightly on the outside of the battery cell core package, thereby ensuring the constraint force of the first and second binding tape on the top and bottom of the battery cell core package.

[0021] (3) The top of the battery cell core pack is provided with a first binding groove and the bottom is provided with a second binding groove. By setting the first binding strap in the first binding groove and the second binding strap in the second binding groove, the binding position of the first binding strap and the second binding strap are guided, and the wrapping of the first binding strap and the second binding strap on the outside of the battery cell core pack is more secure.

[0022] (4) This battery cell has multiple equally spaced reinforcing ribs on the outer walls of the first and second binding straps, thereby enhancing the structural strength of the first and second binding straps and thus enhancing the constraint effect of the first and second binding straps on the battery cell core package.

[0023] (5) The battery cell housing is provided with a first limiting member and a second limiting member. The first limiting member limits the top of the battery cell pack, thereby further constraining the deformation of the top of the battery cell pack; the second limiting member limits the bottom of the battery cell pack, thereby further constraining the deformation of the bottom of the battery cell pack, thus preventing the gap between the top and bottom of the pack from being too large, thereby improving the problem of lithium plating at the negative electrode at the top and bottom of the battery cell pack, and ensuring the performance of the battery cell.

[0024] (6) The first limiting member and the second limiting member of this battery cell are both set as rubber pads to protect the first binding strap and the second binding strap, and prevent the friction caused by vibration during use from causing wear to the first binding strap and the second binding strap, thus affecting the service life of the first binding strap and the second binding strap. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements.

[0026] Figure 1 This is an exploded view of a battery cell with improved lithium plating at the top and bottom of the core package, according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of a battery cell housing for improving lithium plating at the top and bottom of the battery pack according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a battery cell core package according to an embodiment of the present invention, which improves the lithium plating at the top and bottom of the core package.

[0029] Figure 4 This is a plan view of the first and second binding straps of a battery cell with improved lithium plating at the top and bottom of the core package, according to an embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the structure of a battery cell with improved lithium plating at the top and bottom of the core package, showing the first and second binding straps encircling the cell in an embodiment of the present invention.

[0031] In the diagram: 1. Battery cell housing; 11. Cavity; 12. First limiting member; 121. Insertion slot; 13. Second limiting member; 2. Battery cell core package; 21. First binding slot; 22. Second binding slot; 3. First binding tape; 31. First bonding area; 32. Second bonding area; 33. Bonding marking area; 34. Reinforcing rib; 4. Second binding tape. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0033] Please see Figures 1-5 An embodiment of the present invention provides a battery cell with improved lithium plating at the top and bottom of the core package, comprising a battery cell housing 1 and a battery cell core package 2, wherein the battery cell housing 1 is provided with a cavity 11, and the battery cell core package 2 is loaded in the cavity 11 of the battery cell housing 1.

[0034] It is foreseeable that the battery cell also includes a top cover and a terminal assembly set on the top cover. The top cover is fixedly connected to the battery cell housing 1 to seal the opening of the battery cell housing 1. The terminal assembly on the top cover is connected to the tabs in the battery cell core package 2, thereby leading out the positive and negative terminals of the battery cell core package 2 through the terminal assembly to realize the charging and discharging function of the battery cell.

[0035] In this application, the battery cell also includes a first binding strap 3 and a second binding strap 4. The first binding strap 3 is wrapped around the outside of the battery cell core package 2, so that during the tab shaping, the top of the battery cell core package 2 is constrained by the first binding strap 3 to prevent the top of the battery cell core package 2 from expanding outward under the action of external shaping equipment, causing the gap at the top edge of the battery cell core package 2 to be too large, forming a local electrolyte break bridge, and producing lithium plating.

[0036] The bottom of the battery cell pack 2 is constrained by the second binding strap 4 to prevent the separator from being squeezed by the weight of the battery cell pack 2 itself, which would cause the bottom outline of the battery cell pack 2 to become too large, resulting in a local electrolyte break bridge and lithium plating.

[0037] Therefore, in this application, the deformation of the top of the battery cell pack 2 is constrained by the first binding strap 3 encircling the top of the battery cell pack 2, and the deformation of the bottom of the battery cell pack 2 is constrained by the second binding strap 4 encircling the bottom of the battery cell pack 2, thereby preventing the gap between the top and bottom of the pack from being too large, thereby improving the problem of lithium plating at the negative electrode at the top and bottom of the battery cell pack 2 and ensuring the performance of the battery cell.

[0038] Example 1:

[0039] In this embodiment, the first end of the first binding strap 3 and the second binding strap 4 are both provided with a first adhesive area 31, and the second end of the second binding strap 4 is provided with a second adhesive area 32. The first adhesive area 31 and the second adhesive area 32 are both located inside the first binding strap 3 or the second binding strap 4.

[0040] When the first binding strap 3 or the second binding strap 4 is wrapped around the outside of the battery cell core package 2, the first adhesive area 31 of the first end of the first binding strap 3 or the second binding strap 4 is first bonded to the outer wall of the battery cell core package 2, thereby fixing the first end of the first binding strap 3 or the second binding strap 4 to the battery cell core package 2.

[0041] Next, wrap the first binding strap 3 or the second binding strap 4 around the outside of the battery cell core package 2, and finally bond the second adhesive area 32 of the second end of the first binding strap 3 or the second binding strap 4 to the outer wall of the battery cell core package 2, so that the second end of the first binding strap 3 or the second binding strap 4 is fixedly connected to the battery cell core package 2.

[0042] Example 2:

[0043] In this embodiment, the first end of the first binding strap 3 and the second binding strap 4 are both provided with a first adhesive area 31, and the second end of both are provided with a second adhesive area 32. The first adhesive area 31 is located on the outside of the first binding strap 3 or the second binding strap 4, and the second adhesive area 32 is located on the inside of the first binding strap 3 or the second binding strap 4.

[0044] When the first binding strap 3 or the second binding strap 4 is wrapped around the outside of the battery cell core package 2, the first binding strap 3 or the second binding strap 4 is wrapped around the outside of the battery cell core package 2 once. At this time, the first adhesive area 31 located at the first end of the first binding strap 3 or the second binding strap 4 coincides with the projection of the second adhesive area 32 located at the second end of the first binding strap 3 or the second binding strap 4. Thus, the first adhesive area and the second adhesive area 32 are bonded to each other, and the first end of the first binding strap 3 or the second binding strap 4 is fixedly connected to the second end.

[0045] Example 3:

[0046] In this embodiment, the first end of the first binding strap 3 and the second binding strap 4 are both provided with a first adhesive area 31, and the second end of the second binding strap 4 is provided with a second adhesive area 32. The first adhesive area 31 and the second adhesive area 32 are both located inside the first binding strap 3 or the second binding strap 4.

[0047] When wrapping the first binding strap 3 or the second binding strap 4 around the outside of the battery cell core package 2, firstly, the first adhesive area 31 of the first end of the first binding strap 3 or the second binding strap 4 is bonded to the outer wall of the battery cell core package 2, thereby fixing the first end of the first binding strap 3 or the second binding strap 4 to the battery cell core package 2. Then, the first binding strap 3 or the second binding strap 4 is wrapped around the outside of the battery cell core package 2 once, so that the projection portions of the first end and the second end of the first binding strap 3 or the second binding strap 4 overlap.

[0048] Finally, the second adhesive area 32 at the second end of the first cable tie 3 or the second cable tie 4 is bonded to the first end of the first cable tie 3 or the second cable tie 4, thereby fixing the first end and the second end of the first cable tie 3 or the second cable tie 4 together.

[0049] Specifically, in actual implementation, depending on the specific production situation, the method in the above three embodiments can be selected, with the first binding strap 3 placed on the top of the battery cell core package 2 and the second binding strap 4 placed on the bottom of the battery cell core package 2.

[0050] It is foreseeable that in Embodiment 1, the first binding strap 3 and the second binding strap 4 are not completely wrapped around the outside of the battery cell core package 2, while in Embodiments 2 and 3, the first binding strap 3 and the second binding strap 4 are completely wrapped around the outside of the battery cell core package 2. Therefore, compared with the implementation methods in Embodiments 1, 2 and 3, the first binding strap 3 and the second binding strap 4 have a better constraint effect on the battery cell core package 2.

[0051] Compared to Embodiment 2, the implementation method in Embodiment 3 is simpler, more convenient and easier to implement. Therefore, in this application, the implementation method in Embodiment 3 is preferred, in which the first binding strap 3 is wrapped around the top outer side of the battery cell core package 2 and the second binding strap 4 is wrapped around the bottom outer side of the battery cell core package 2.

[0052] In the implementation of embodiment three, when the first binding strap 3 is wrapped around the top outer side of the battery cell core package 2 and the second binding strap 4 is wrapped around the bottom outer side of the battery cell core package 2, in this embodiment, the first ends of the first binding strap 3 and the second binding strap 4 are further provided with an adhesive marking area 33. The adhesive marking area 33 is located on the outside of the first binding strap 3 and the second binding strap 4 and is used to mark the adhesive position of the second adhesive area 32.

[0053] In this application, a first bonding area 31 is provided on the inner side of the first end of the first binding strap 3 and the second binding strap 4, and a bonding marking area 33 is provided on the outer side. A second bonding area 32 is provided on the inner side of the second end of the first binding strap 3 and the second binding strap 4.

[0054] When wrapping the first binding strap 3 or the second binding strap 4 around the outside of the battery cell core package 2, firstly, the first bonding area 31 on the inner side of the first end of the first binding strap 3 or the second binding strap 4 is bonded to the outer wall of the battery cell core package 2, thereby fixing the first end of the first binding strap 3 or the second binding strap 4 to the battery cell core package 2.

[0055] Then, wrap the first binding strap 3 or the second binding strap 4 around the outside of the battery cell core package 2 once, so that the second bonding area 32 on the inner side of the second end of the first binding strap 3 or the second binding strap 4 coincides with the projection of the bonding marking area 33 on the outer side of the first binding strap 3 or the second binding strap 4, so that the second bonding area 32 and the bonding marking area 33 are bonded together, and the second end of the first binding strap 3 or the second binding strap 4 is fixedly connected to the first end.

[0056] In this application, the bonding position of the second bonding area 32 is marked by the bonding marking area 33, which makes it simpler, more convenient and easier to implement the setting of the first binding strap 3 or the second binding strap 4 on the outside of the battery cell core package 2, thereby improving the practicality of the battery cell. It also makes the first binding strap 3 or the second binding strap 4 wrapped more tightly on the outside of the battery cell core package 2, thereby ensuring the constraint force of the first binding strap 3 and the second binding strap 4 on the top and bottom of the battery cell package.

[0057] In this embodiment, the top of the battery cell core package 2 is provided with a first binding groove 21 and the bottom is provided with a second binding groove 22. When the first binding strap 3 and the second binding strap 4 are wrapped around the outside of the battery cell core package 2, the first binding strap 3 is placed in the first binding groove 21 and the second binding strap 4 is placed in the second binding groove 22.

[0058] On the one hand, the first binding groove 21 guides the position of the first binding strap 3 wrapped around the top of the battery cell core package 2, and the second binding groove 22 guides the position of the second binding strap 4 wrapped around the bottom of the battery cell core package 2, thereby making the setting of the first binding strap 3 or the second binding strap 4 on the outside of the battery cell core package 2 simpler, more convenient and easier to implement, and further improving the practicality of the battery cell.

[0059] On the other hand, the first binding groove 21 limits the first binding strap 3 wrapped around the top of the battery cell core package 2, and the second binding groove 22 limits the second binding strap 4 wrapped around the bottom of the battery cell core package 2, so that the first binding strap 3 and the second binding strap 4 are more securely wrapped around the outside of the battery cell core package 2, and further improve the constraint effect of the first binding strap 3 and the second binding strap 4 on the battery cell core package 2.

[0060] In this embodiment, the outer sides of the first binding strap 3 and the second binding strap 4 are provided with a plurality of reinforcing ribs 34, and the plurality of reinforcing ribs 34 are distributed at equal intervals along the outer wall of the first binding strap 3 or the second binding strap 4.

[0061] In this application, by providing multiple equally spaced reinforcing ribs 34 on the outer walls of the first binding strap 3 and the second binding strap 4, the structural strength of the first binding strap 3 and the second binding strap 4 is enhanced, thereby enhancing the constraint effect of the first binding strap 3 and the second binding strap 4 on the battery cell core package 2.

[0062] In this embodiment, a first limiting member 12 and a second limiting member 13 are provided in the battery cell housing 1. When the battery cell core package 2 is loaded into the cavity 11 of the battery cell housing 1, the first limiting member 12 limits the top of the battery cell core package 2, further constraining the deformation of the top of the battery cell core package 2.

[0063] The second limiting member 13 limits the bottom of the battery cell core package 2, further constraining the deformation of the bottom of the battery cell core package 2, thereby preventing the gap between the top and bottom of the core package from being too large, thus improving the problem of lithium plating at the negative electrode at the top and bottom of the battery cell core package 2 and ensuring the performance of the battery cell.

[0064] In this embodiment, when the battery cell core package 2 is loaded into the cavity 11 of the battery cell housing 1, the position of the first limiting member 12 corresponds exactly to the position of the first binding strap 3 that surrounds the top of the battery cell core package 2, so that the first limiting member 12 surrounds the outside of the first binding strap 3. Thus, when the battery cell core package 2 is loaded into the battery cell housing 1, the deformation of the top of the battery cell core package 2 is constrained by the first limiting member 12 and the first binding strap 3 at the same time.

[0065] The position of the second limiting member 13 corresponds exactly to the position of the second binding strap 4 that surrounds the bottom of the battery cell core package 2, so that the second limiting member 13 surrounds the outside of the second binding strap 4. Thus, when the battery cell core package 2 is loaded into the battery cell housing 1, the deformation of the bottom of the battery cell core package 2 is constrained by the second limiting member 13 and the second binding strap 4 at the same time.

[0066] In this application, both the first limiting member 12 and the second limiting member 13 are provided with multiple insertion slots 121. When the battery cell core package 2 is loaded into the cavity 11 of the battery cell housing 1, multiple reinforcing ribs 34 on the outside of the first binding strap 3 are respectively inserted into the multiple insertion slots 121 on the first limiting member 12, and multiple reinforcing ribs 34 on the outside of the second binding strap 4 are respectively inserted into the multiple insertion slots 121 on the second limiting member 13, thereby further enhancing the stability of the battery cell structure.

[0067] Specifically, in this embodiment, the first limiting member 12 is a rubber pad that surrounds the top inner wall of the cavity 11, and the second limiting member 13 is a rubber pad that surrounds the bottom inner wall of the cavity 11. When the battery cell package 2 is loaded into the cavity 11 of the battery cell housing 1, the first limiting member 12 surrounds the outside of the first binding strap 3, and the second limiting member 13 surrounds the outside of the second binding strap 4.

[0068] Therefore, in this application, both the first limiting member 12 and the second limiting member 13 are set as rubber pads to protect the first binding strap 3 and the second binding strap 4, and to prevent the friction caused by vibration during use from causing wear to the first binding strap 3 and the second binding strap 4, thus affecting the service life of the first binding strap 3 and the second binding strap 4.

[0069] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell with improved lithium plating at the top and bottom of the core package, characterized in that: The battery includes a battery cell housing (1) with an internal cavity (11), a battery cell core pack (2) loaded in the cavity (11), a first binding strap (3) located on the top of the battery cell core pack (2), and a second binding strap (4) located on the bottom of the battery cell core pack (2); the first binding strap (3) is wrapped around the outside of the battery cell core pack (2) to constrain the deformation of the top of the battery cell core pack (2), and the second binding strap (4) is wrapped around the outside of the battery cell core pack (2) to constrain the deformation of the bottom of the battery cell core pack (2).

2. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 1, characterized in that: The first end of the first binding band (3) and the second binding band (4) are provided with a first bonding area (31), and the second end of the second binding band (4) are provided with a second bonding area (32). The first bonding area (31) and the second bonding area (32) are located on the inner side of the first binding band (3) or the second binding band (4) and are used to bond the two ends of the first binding band (3) or the second binding band (4) to the outer wall of the battery cell core package (2).

3. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 1, characterized in that: The first binding band (3) and the second binding band (4) are provided with a first bonding area (31) at their first ends and a second bonding area (32) at their second ends. The first binding band (3) and the second binding band (4) surround the outer side of the battery cell core package (2). The first bonding area (31) is located on the outside of the first binding band (3) or the second binding band (4), and the second bonding area (32) is located on the inside of the first binding band (3) or the second binding band (4). The first bonding area (31) and the second bonding area (32) are bonded to each other to connect the two ends of the first binding band (3) or the second binding band (4).

4. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 1, characterized in that: The first binding band (3) and the second binding band (4) are provided with a first bonding area (31) at their first ends and a second bonding area (32) at their second ends. The first binding band (3) and the second binding band (4) surround the outer side of the battery core package (2). The first bonding area (31) and the second bonding area (32) are both located on the inner side of the first binding band (3) or the second binding band (4). The first bonding area (31) is used to bond with the outer wall of the battery core package (2), and the second bonding area (32) is used to bond the two ends of the first binding band (3) or the second binding band (4).

5. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 4, characterized in that: The first end of the first binding band (3) and the second binding band (4) is also provided with an adhesive marking area (33). The adhesive marking area (33) is located on the outside of the first binding band (3) or the second binding band (4) and is used to mark the adhesive position of the second adhesive area (32).

6. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 1, characterized in that: The top of the battery cell pack (2) is provided with a first binding groove (21) and the bottom is provided with a second binding groove (22). The first binding strap (3) is provided in the first binding groove (21) and the second binding strap (4) is provided in the second binding groove (22).

7. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 1, characterized in that: The outer sides of the first binding strap (3) and the second binding strap (4) are provided with a plurality of reinforcing ribs (34), and the plurality of reinforcing ribs (34) are distributed at equal distances along the outer wall of the first binding strap (3) or the second binding strap (4).

8. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 7, characterized in that: The battery cell housing (1) is provided with a first limiting member (12) and a second limiting member (13). When the battery cell core package (2) is loaded into the cavity (11), the first limiting member (12) limits the top of the battery cell core package (2), and the second limiting member (13) limits the bottom of the battery cell core package (2).

9. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 8, characterized in that: When the battery cell core package (2) is loaded into the cavity (11), the first limiting member (12) surrounds the outside of the first binding strap (3), and the second limiting member (13) surrounds the outside of the second binding strap (4). Both the first limiting member (12) and the second limiting member (13) are provided with multiple insertion slots (121), and the multiple reinforcing ribs (34) are respectively inserted into the multiple insertion slots (121).

10. A battery cell with improved lithium plating at the top and bottom of the cassette as described in claim 9, characterized in that: The first limiting member (12) is a rubber pad that surrounds the top inner wall of the cavity (11), and the second limiting member (13) is a rubber pad that surrounds the bottom inner wall of the cavity (11).

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