Battery cell, battery pack and electric device

Abstract

The utility model relates to battery technology field and provide a kind of electric core, battery pack and electric equipment.The utility model discloses electric core including the shell that is housed pole group, cover plate connected on shell and protection piece;The protruding part of being equipped with in lower plastic in cover plate, protruding part is located the both ends of lower plastic length direction, and the accommodation groove is formed between two protruding parts;The tab in pole group is bent from the side of pole group thickness direction to opposite side, and is electrically connected with the pole of cover plate;Bent tab is at least partially housed in accommodation groove;Protection piece is located in accommodation groove, and between bent tab and the main body of pole group, and protection piece and tab and lower plastic all abut.The utility model discloses electric core by setting protection piece, can play the protection effect to pole group, prevent the corner position tab of pole group puncture diaphragm and cause positive and negative short circuit.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell. This utility model also relates to a battery pack incorporating the aforementioned battery cell, and an electrical device incorporating the aforementioned battery pack. Background Technology

[0002] Lithium-ion batteries, as one of the representatives of new energy sources, are widely used in transportation, home appliances and various energy storage fields.

[0003] In existing technologies, the structure of a battery cell typically includes a casing and a cover plate. The interior of the casing houses the electrode assembly, and the tabs in the electrode assembly are electrically connected to the terminals on the cover plate, thereby enabling the transfer of electrical energy. In battery cell design, a plastic structure under the cover plate is typically used to fix the electrode assembly. For example, in the blade battery, inserting the electrode assembly into the casing is a critical step in the manufacturing process. During this process, excessive force, speed, or excessive travel can easily cause the corner electrodes of the electrode assembly to puncture the separator, resulting in positive and negative electrode overlap and potentially leading to a short circuit inside the battery. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery cell that can protect the internal electrode assembly.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery cell includes a housing containing an electrode assembly, a cover plate connected to the housing, and a protective element; The lower plastic in the cover plate is provided with protrusions, which are located at both ends of the lower plastic in the length direction, and a receiving groove is formed between the two protrusions; The tabs in the electrode assembly are bent from one side of the electrode assembly thickness direction to the opposite side and electrically connected to the electrode post on the cover plate. The bent tabs are at least partially housed in the receiving groove. The protective component is disposed in the receiving groove and located between the bent electrode tab and the main body of the electrode assembly, and the protective component abuts against both the electrode tab and the lower plastic.

[0006] Furthermore, the protective component includes a protective layer and an adhesive layer disposed on one side of the protective layer; the protective component is bonded to the tab and the lower plastic through the adhesive layer.

[0007] Furthermore, the protective layer is made of one of MPP foam, polyurethane foam, and ceramic fiber; the adhesive layer is made of acrylic adhesive.

[0008] Furthermore, the receiving groove is a rectangular groove; the protective member is elongated, and the length of the protective member is 1mm-2mm shorter than the length of the receiving groove.

[0009] Furthermore, the ratio between the width d1 of the protective member and the dimension d2 of the protrusion in the width direction of the cover plate satisfies: 1 / 3 ≤ d1 / d2 ≤ 1 / 2.

[0010] Furthermore, the distance between the protective component and the top of the pole post is less than the distance between the protrusion and the top of the pole post, and the difference h between the two satisfies: 0.8mm≤h≤1.2mm.

[0011] Furthermore, the cover plate includes a first cover plate and a second cover plate disposed at opposite ends of the housing, and the lower plastic in the first cover plate and the second cover plate has the same structure; the opposite sides of the electrode assembly are respectively provided with a first electrode tab and a second electrode tab, the first electrode tab being electrically connected to the electrode post in the first cover plate, and the second electrode tab being electrically connected to the electrode post in the second cover plate; the protective member is disposed between the bent first electrode tab and the main body of the electrode assembly, and the protective member abuts against the first electrode tab and the corresponding lower plastic; or, the protective member is disposed between the bent second electrode tab and the main body of the electrode assembly, and the protective member abuts against the second electrode tab and the corresponding lower plastic.

[0012] Compared with the prior art, this utility model has the following advantages: (1) The battery cell described in this utility model has a protective component set on the lower plastic of the cover plate. The protective component is located between the bent tab and the main body of the electrode assembly, and the protective component is in contact with both the tab and the lower plastic. In this way, during the process of the electrode assembly being inserted into the housing, the protective component can provide auxiliary support to one side of the electrode assembly under the push of the protrusions at both ends, preventing uneven force on the corner of the electrode assembly and the occurrence of corner electrode pieces piercing the diaphragm. This can protect the corner of the electrode assembly and avoid the positive and negative electrodes from piercing the diaphragm due to the corner electrode pieces of the electrode assembly, thereby improving the quality and reliability of the battery cell.

[0013] (2) The protective component includes a protective layer and an adhesive layer. The adhesive layer is bonded to the lower plastic, making the installation of the protective component more convenient.

[0014] (3) The protective layer is made of MPP foam, polyurethane foam or ceramic fiber. The material is relatively light and has a certain elasticity, so it will not damage the electrode tabs. The adhesive layer is made of acrylic glue. This component is the same as the blue glue inside the battery cell and does not react with the electrolyte.

[0015] (4) The length of the protective component should be 1-2 mm shorter than the length of the receiving groove. This can prevent the protective component from being too long and interfering with the edge of the lower plastic, and also prevent the protective component from being too short and affecting the protective effect of the electrode assembly.

[0016] (5) Limiting the width of the protective component and the dimensional ratio of the protrusion in the width direction of the cover plate can provide better protection for the electrode assembly while avoiding the bending of the electrode tab due to the excessive width of the protective component.

[0017] (6) Limit the difference between the distance between the protective part and the top of the pole post and the distance between the protrusion and the top of the pole post, so as to prevent excessive compression of the pole sheet.

[0018] (7) The protective component is set between the bent first electrode tab and the main body of the electrode group, or between the bent second electrode tab and the main body of the electrode post. This way, as needed, the protective component can be set only on a cover plate of the top-pushing electrode group into the housing, thereby reducing the use of the protective component and providing better protection for the corners of the electrode group, thus improving the manufacturing quality of the battery cell.

[0019] This utility model also proposes a battery pack, in which the above-mentioned battery cells are provided.

[0020] In addition, this utility model also proposes an electrical device, which is equipped with the aforementioned battery pack.

[0021] The battery pack and electrical equipment described in this utility model have the same beneficial effects as the battery cells described above compared to the prior art, and will not be repeated here. Attached Figure Description

[0022] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a partial enlarged view of the battery cell described in an embodiment of this utility model; Figure 2 This is a structural schematic diagram of the protective component and the cover plate in the cooperation state according to an embodiment of the present utility model; Figure 3 This is a partial structural diagram of the cover plate described in an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the battery cell described in an embodiment of the present utility model; Explanation of reference numerals in the attached figures: 1. Housing; 2. Cover plate; 3. Electrode assembly; 4. Protective components; 21. Cover plate body; 22. Lower plastic; 23. Upper plastic; 24. Terminal post; 31. Main body; 32. Terminal lug; 221. Protrusion; 222. Receiving groove; O, reference point. Detailed Implementation

[0023] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0025] Furthermore, in the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they 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 do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0027] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0029] An embodiment of the first aspect of this utility model provides a battery cell that can protect the electrode assembly by means of a protective component disposed on the lower plastic part of the cover plate, preventing the electrode plates at the corners of the electrode assembly from piercing the diaphragm and causing a short circuit between the positive and negative electrodes.

[0030] In existing technologies, taking the blade battery as an example, the electrode assembly insertion process is one of the key steps in the manufacturing process of the blade battery. During the electrode assembly insertion process, excessive force, excessive speed, or excessive travel can easily cause the electrode plates at the corners of the electrode assembly to puncture the separator, resulting in the positive and negative electrodes colliding, which in turn leads to a short circuit point inside the battery.

[0031] In view of this, in order to overcome the shortcomings of the prior art, the battery cell in this embodiment incorporates... Figures 1 to 4 In terms of overall structure, it includes a housing 1 that houses the electrode assembly 3, a cover plate 2 connected to the housing 1, and a protective component 4.

[0032] The cover plate 2 has a protrusion 221 on the lower plastic 22 for pushing the electrode assembly 3 into the housing 1. The protrusion 221 is located at both ends of the lower plastic 22 along its length, and a receiving groove 222 is formed between the two protrusions 221. The electrode tab 32 in the electrode assembly 3 is bent from one side of the electrode assembly 3 in the thickness direction to the opposite side and is electrically connected to the electrode post 24 on the cover plate 2. The bent electrode tab 32 is at least partially received in the receiving groove 222. The protective member 4 is provided in the receiving groove 222 and is located between the bent electrode tab 32 and the main body 31 of the electrode assembly 3. The protective member 4 abuts against both the electrode tab 32 and the lower plastic 22.

[0033] Therefore, by setting the protective component 4 on the lower plastic 22 in the cover plate 2, the protective component 4 is located between the bent electrode tab 32 and the main body 31 of the electrode group 3, and the protective component 4 abuts against both the electrode tab 32 and the lower plastic 22. In this way, during the process of inserting the electrode group 3 into the housing 1, under the pushing of the protrusions 221 at both ends, the protective component 4 can provide auxiliary support for one side of the electrode group 3, preventing uneven force on the corner of the electrode group 3 and the occurrence of the corner electrode piercing the diaphragm. Thus, the corner of the electrode group 3 can be protected, avoiding the positive and negative electrodes from piercing the diaphragm due to the corner electrode of the electrode group 3, thereby improving the quality of the battery cell and the reliability of its use.

[0034] Based on the above overview, specifically, a battery cell typically includes a housing 1 and a cover plate 2. The cavity inside the housing 1 is used to house the electrode assembly 3 and the electrolyte. Structurally, the electrode assembly 3 typically has a main body 31 and electrode tabs 32 connected to the sides of the main body 31. Structurally, the cover plate 2 typically includes a cover plate body 21, lower plastic 22 and upper plastic 23 disposed on both sides of the cover plate body 21, as well as electrode posts 24 and sealing rings fitted onto the electrode posts. The upper plastic 23, lower plastic 22, and sealing rings are used to provide an insulating connection between the electrode posts 24 and the cover plate body 21.

[0035] Combination Figures 1 to 4 As shown, the lower plastic 22 of the cover plate 2 is provided with protrusions 221 for pushing the electrode assembly 3 into the housing 1. The protrusions 221 are located at both ends in the width direction of the lower plastic 22, and a receiving groove 222 for receiving the electrode tab 32 is formed between the two protrusions 221. In a specific implementation, the electrode tab 32 is bent from one side of the electrode assembly 3 to the opposite side in the width direction and is electrically connected to the electrode post 24 on the cover plate 2. At this time, one side of the bent electrode tab 32 is in contact with the electrode post 24, and the other side forms a certain gap with the main body 31 of the electrode assembly 3. The protective member 4 is provided in the receiving groove 222 and is located at the gap position, that is, between the bent electrode tab 32 and the main body 31, and the protective member 4 is in contact with both the electrode tab 32 and the lower plastic 22.

[0036] In some exemplary embodiments, the protective component 4 is bonded to the tab 32 and the lower plastic part 22, for example. Structurally, the protective component 4 includes, for example, a protective layer and an adhesive layer disposed on one side of the protective layer. The protective component 4 is bonded to the tab 32 and the lower plastic part 22 through the adhesive layer. In this case, the bonded connection between the protective component 4 and the tab 32 can also improve the reliability of the connection between the tab 32 and the pole post 24. Moreover, the adhesive connection method also makes the installation of the protective component 4 more convenient.

[0037] The protective component 4 in this embodiment does not react with the electrolyte and has a certain degree of hardness and elasticity. In some exemplary embodiments, the protective layer of the protective component 4 is made of, for example, one of MPP foam, polyurethane foam, and ceramic fiber. These materials are lightweight and have a certain degree of elasticity, so they will not damage the tabs 32. The adhesive layer is made of acrylic adhesive, which has the same composition as the blue adhesive inside the battery cell and does not react with the electrolyte. The adhesive layer of the protective component 4 is made of acrylic adhesive, for example. The composition of the acrylic adhesive is the same as the blue adhesive inside the battery cell and does not react with the electrolyte.

[0038] It should be noted that the MPP foam mentioned above is preferably made of MPP10 high-density supercritical foam, which is lightweight and has a certain degree of elasticity, and will not damage the electrode tabs 32 when the electrode assembly 3 is inserted into the shell. It should also be noted that the amount of electrolyte absorbed by the MPP foam, polyurethane foam, and ceramic fibers is negligible.

[0039] Combination Figure 2 and Figure 3 As shown, the receiving groove 222 on the lower plastic part 22 is a rectangular groove. In some exemplary embodiments, the protective member 4 is, for example, elongated, and the length of the protective member 4 is 1mm-2mm shorter than the length of the receiving groove 222, that is... Figure 2 The dimension L shown is used. In specific implementations, the length of the protective component 4 is shorter than the length of the receiving groove 222 by, for example, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm. In this case, by limiting the length of the protective component 4, it is possible to prevent the protective component 4 from being too long and interfering with the edge of the lower plastic 22, and to prevent the protective component 4 from being too short and affecting the protective effect of the electrode assembly 3. At the same time, it also ensures that the protective component 4 is easier and more firmly attached.

[0040] Based on the specified length of protective component 4, please refer to... Figure 2 Furthermore, for example, the ratio i between the width d1 of the protective member 4 and the dimension d2 of the protrusion 221 in the width direction of the cover plate 2 satisfies: i = d1 / d2, 1 / 3 ≤ i ≤ 1 / 2. In specific implementations, the ratio i can be set to, for example, 1 / 3, 2 / 5, 3 / 7, or 1 / 2. By limiting the ratio of the width of the protective member 4 to the dimension of the protrusion 221 in the width direction of the cover plate 2, the electrode assembly 3 can be well protected while preventing the protective member 4 from affecting the bending of the electrode tab 32 due to excessive width.

[0041] Reference Figure 1 As shown, in some exemplary embodiments, for example, the distance h1 between the protective member 4 and the top of the pole post 24 is less than the distance h2 between the protrusion 221 and the top of the pole post 24, and the difference h satisfies: h = h2 - h1, 0.8 mm ≤ h ≤ 1.2 mm. In specific implementations, the difference h can be set to, for example, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, or 1.2 mm, preferably 1.0 mm. In this way, by limiting the difference between the distance between the protective member 4 and the top of the pole post 24 and the distance between the protrusion 221 and the top of the pole post 24, excessive compression of the pole sheet can be effectively prevented.

[0042] Reference Figure 4As shown, in some exemplary embodiments, the cover plate 2 includes, for example, a first cover plate 2 and a second cover plate 2 disposed at opposite ends of the housing 1. The lower plastic 22 in the first cover plate 2 and the second cover plate 2 have the same structure, that is, both ends of the two lower plastic 22 have protrusions 221, and the protrusions 221 at both ends also form receiving grooves 222. The electrode group 3 is provided with a first electrode tab 32 and a second electrode tab 32 on opposite sides, respectively. The first electrode tab 32 is electrically connected to the electrode post 24 in the first cover plate 2, and the second electrode tab 32 is electrically connected to the electrode post 24 in the second cover plate 2.

[0043] The aforementioned protective element 4 is, for example, disposed between the bent first tab 32 and the main body 31 of the electrode assembly 3, with the protective element 4 abutting against both the first tab 32 and the corresponding lower plastic 22. Alternatively, the protective element 4 is, for example, disposed between the bent second tab 32 and the main body 31 of the electrode assembly 3, with the protective element 4 abutting against both the second tab 32 and the corresponding lower plastic 22. In this case, the protective element 4 can be provided only on one cover plate 2 that pushes the electrode assembly 3 into the housing 1 as needed, thereby reducing the use of the protective element 4 and providing better protection for the corners of the electrode assembly 3, thus improving the manufacturing quality of the battery cell.

[0044] In this embodiment, since the tab 32 is located near the end of the cover plate 2, the size of the protrusion 221 located near the tab 32 in the length direction of the cover plate 2 is smaller than the size of the protrusion 221 located away from the tab 32. Therefore, during the process of pushing the electrode assembly 3 into the housing 1, the electrode sheet is prone to puncture the diaphragm at the position of the protrusion 221 located near the tab 32. At this time, the protective member 4 should be located near this position so that the protective member 4 can share the pressure at the corner of the electrode assembly 3.

[0045] Furthermore, during the specific assembly of the battery cell in this embodiment, firstly, the tabs 32 in the electrode group 3 are electrically connected to the posts 24 on the cover plate 2. Then, the protective component 4... Figure 2 The reference point O is pasted on, and then the electrode assembly 3 is wrapped with an insulating film to isolate the metal housing 1 from the electrode assembly 3. Next, the electrode assembly 3 is pushed into the housing 1, and then the welding connection between the housing 1 and the cover plate 2 is completed.

[0046] It is worth noting that, regarding the battery cell in this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made by... Figures 1 to 4As shown, it includes, for example, a housing 1, a cover plate 2, and a protective member 4. The cover plate 2 includes a first cover plate 2 and a second cover plate 2 disposed at opposite ends of the housing 1. The lower plastic 22 in the first cover plate 2 and the second cover plate 2 have the same structure. A first electrode tab 32 and a second electrode tab 32 are respectively provided on opposite sides of the electrode assembly 3. The first electrode tab 32 is electrically connected to the electrode post 24 in the first cover plate 2, and the second electrode tab 32 is electrically connected to the electrode post 24 in the second cover plate 2. The protective member 4 is disposed between one of the electrode tabs 32 and the main body 31 of the electrode assembly 3, that is, between the first electrode tab 32 and the main body 31 of the electrode assembly 3, or between the second electrode tab 32 and the main body 31 of the electrode assembly 3.

[0047] The cover plate 2 has a protrusion 221 on the lower plastic 22 for pushing the electrode assembly 3 into the housing 1. The protrusion 221 is located at both ends of the lower plastic 22, and a receiving groove 222 is formed between the two protrusions 221. The electrode tab 32 in the electrode assembly 3 is bent from one side of the electrode assembly 3 to the opposite side and is electrically connected to the electrode post 24 on the cover plate 2. The bent electrode tab 32 is at least partially received in the receiving groove 222. The protective member 4 is provided in the receiving groove 222 and is located between the bent electrode tab 32 and the main body 31 of the electrode assembly 3. The protective member 4 is bonded to both the electrode tab 32 and the lower plastic 22.

[0048] The protective component 4 includes a protective layer and an adhesive layer disposed on one side of the protective layer. The protective component 4 is bonded to the tab 32 and the lower plastic 22 via the adhesive layer. Preferably, the protective layer is made of MPP10 foam, and the adhesive layer is preferably made of acrylic adhesive.

[0049] The protective component 4 is elongated, and its length is 1-2 mm shorter than the length of the receiving groove 222. Furthermore, the ratio between the width d1 of the protective component 4 and the dimension d2 of the protrusion 221 in the width direction of the cover plate 2 satisfies: 1 / 3 ≤ d1 / d2 ≤ 1 / 2. Simultaneously, the difference h between the distance between the protective component 4 and the top of the pole post 24 and the distance between the protrusion 221 and the top of the pole post 24 satisfies: 0.8 mm ≤ h ≤ 1.2 mm.

[0050] In the above preferred embodiments, the material of the protective member 4, the matching relationship between the protective member 4 and the receiving groove 222, etc., can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the material of the protective member 4, the matching relationship between the protective member 4 and the receiving groove 222, etc., based on the beneficial effects brought about by its design, can also be referred to the descriptions in the above exemplary embodiments.

[0051] The battery cell of this embodiment adopts the above design. With the protective component 4, during the process of inserting the electrode group 3 into the housing 1, the protective component 4 can provide auxiliary support to one side of the electrode group 3 under the pushing of the protrusions 221 at both ends. This prevents uneven force on the corner of the electrode group 3, which could cause the corner electrode to puncture the diaphragm. Thus, the corner of the electrode group 3 can be protected, avoiding the positive and negative electrodes from puncturing the diaphragm due to the corner electrode of the electrode group 3, thereby improving the manufacturing quality and reliability of the battery cell.

[0052] A second aspect of this utility model provides a battery pack in which the aforementioned battery cells are provided.

[0053] The battery pack of this embodiment, by using the cells as described above, can protect the electrode group 3, prevent the electrode plates at the corners of the electrode group 3 from puncturing the separator, improve the manufacturing quality of the cells, and thus improve the quality and reliability of the battery pack.

[0054] Furthermore, an embodiment of the third aspect of this utility model provides an electrical device that includes the aforementioned battery pack.

[0055] The electrical equipment in this embodiment, by adopting the above-mentioned battery pack, can also protect the electrode group 3 inside the cell, prevent the electrode plates at the corners of the electrode group 3 from puncturing the separator, improve the manufacturing quality of the cell and the quality and reliability of the battery pack, thereby improving the quality and reliability of the electrical equipment.

[0056] The above descriptions are merely some embodiments of this utility model and are not intended to limit the utility model. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery cell, characterized in that: It includes a housing containing the electrode assembly, a cover plate connected to the housing, and a protective component; The lower plastic in the cover plate is provided with protrusions, which are located at both ends of the lower plastic in the length direction, and a receiving groove is formed between the two protrusions; The tabs in the electrode assembly are bent from one side of the electrode assembly thickness direction to the opposite side and electrically connected to the electrode post on the cover plate. The bent tabs are at least partially housed in the receiving groove. The protective component is disposed in the receiving groove and located between the bent electrode tab and the main body of the electrode assembly, and the protective component abuts against both the electrode tab and the lower plastic.

2. The battery cell according to claim 1, characterized in that: The protective component includes a protective layer and an adhesive layer disposed on one side of the protective layer; The protective component is bonded to the electrode tab and the lower plastic through the adhesive layer.

3. The battery cell according to claim 2, characterized in that: The protective layer is made of one of MPP foam, polyurethane foam and ceramic fiber. The adhesive layer is made of acrylic adhesive.

4. The battery cell according to claim 1, characterized in that: The receiving groove is a rectangular groove; The protective component is elongated, and its length is 1mm-2mm shorter than the length of the receiving groove.

5. The battery cell according to claim 4, characterized in that: The ratio between the width d1 of the protective component and the dimension d2 of the protrusion in the width direction of the cover plate satisfies: 1 / 3 ≤ d1 / d2 ≤ 1 / 2.

6. The battery cell according to claim 4, characterized in that: The distance between the protective component and the top of the pole post is less than the distance between the protrusion and the top of the pole post, and the difference h between the two satisfies: 0.8mm≤h≤1.2mm.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The cover plate includes a first cover plate and a second cover plate disposed at opposite ends of the housing, and the lower plastic in the first cover plate and the second cover plate has the same structure. The electrode group is provided with a first electrode tab and a second electrode tab on opposite sides, the first electrode tab being electrically connected to the electrode post in the first cover plate, and the second electrode tab being electrically connected to the electrode post in the second cover plate. The protective component is disposed between the bent first electrode tab and the main body of the electrode assembly, and the protective component abuts against both the first electrode tab and the corresponding lower plastic; or, the protective component is disposed between the bent second electrode tab and the main body of the electrode assembly, and the protective component abuts against both the second electrode tab and the corresponding lower plastic.

8. A battery pack, characterized in that: The battery pack includes the battery cell as described in any one of claims 1 to 7.

9. An electrical appliance, characterized in that: The electrical equipment is equipped with the battery pack as described in claim 8.

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