Battery cell, power battery and vehicle

Abstract

Provided in the present application are a battery cell, a power battery and a vehicle. The battery cell comprises a battery cell surface, electrode cores and a protective film; the electrode cores are arranged in the battery cell surface, tabs inside the electrode cores extending out of the battery cell surface; the protective film coats the battery cell surface; the protective film is provided with first cuts and a plurality of second cuts, each first cut being communicated with a plurality of the second cuts; the first cuts extend in a first direction; each second cut extends in a second direction, the plurality of second cuts being successively arranged at intervals in the first direction, and the first direction being different from the second direction; the tabs pass through the first cuts so as to be exposed to the protective film; the protective film located on the two sides of each first cut in the second direction is in contact with the outer side walls of the tabs. The battery cell, the power battery and the vehicle provided in the present application can reduce impurities, such as foreign matters and dust, falling into battery cells, thereby improving the quality of finished products.

Description

Battery cells, power batteries and vehicles

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 27, 2023, with application number 202322664876.3 and invention name “Battery Cell, Battery Module, Power Battery and Vehicle”, and the Chinese patent application filed with the China Patent Office on September 27, 2023, with application number 202322650280.8 and invention name “Battery Cell, Power Battery and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery technology, and in particular relates to a battery cell, a power battery and a vehicle. Background Art

[0003] With the rapid development of the new energy vehicle industry, batteries, as one of the main components of new energy vehicles, have entered automated production lines for production and assembly. The current automated battery production process generally follows this pattern: upon entering the automated assembly line, monopolar batteries are clamped by a fixture, then transferred and assembled using the fixture. Since monopolar batteries are protected solely by the fixture throughout the production process, and the fixture's open structure, foreign matter, dust, and other impurities are susceptible to falling into the battery during production and assembly, potentially affecting the quality of the finished product.

[0004] Summary of the Invention

[0005] In order to address the shortcomings of the existing technology, the present application provides a battery cell, a power battery and a vehicle that can reduce the amount of foreign matter, dust and other impurities falling into the battery cell, thereby improving the quality of the finished product.

[0006] In one aspect, the present application provides a battery cell, comprising:

[0007] A pole core is disposed within the surface of the battery core, and a pole ear in the pole core extends out of the surface of the battery core; and

[0008] A protective film is coated on the surface of the battery cell, and the protective film has a first incision and multiple second incisions, and the first incision and the multiple second incisions are connected; the first incision extends along the first direction, and each second incision extends along the second direction, and the multiple second incisions are arranged in sequence along the first direction, and the first direction is different from the second direction; the tab passes through the first incision and exposes the protective film, and the protective film located on both sides of the first incision along the second direction is in contact with the outer wall of the tab.

[0009] In a possible implementation manner, an angle is formed between the first direction and the second direction.

[0010] In a possible implementation manner, the protective film is an insulating film.

[0011] In a possible implementation manner, two opposite sides of the first incision along the second direction are in contact with each other.

[0012] In one possible embodiment, the first incision is spaced apart from each other on two opposite sides along the second direction, and a plurality of the second incisions are all arranged on the same side of the first incision in the second direction; the tab passes through the first incision and exposes the protective film, and the protective film located on both sides of the first incision along the second direction contacts the outer side wall of the tab.

[0013] In a possible implementation, the protective film can be elastically bent and can be restored under the action of its own elastic force.

[0014] In a possible embodiment, the protective film further has a third incision, which is connected to the first incision and extends along the first direction. The protective film located on both sides of the third incision along the second direction contacts the outer side wall of the tab.

[0015] In a possible embodiment, there are two third incisions, both of which are connected to the first incision, both of which extend along the first direction, and are respectively arranged on opposite sides of the first incision along the first direction.

[0016] In a possible embodiment, the protective film also has a plurality of fourth incisions, each of which extends along the second direction, and a plurality of second incisions are arranged in sequence along the first direction; the plurality of fourth incisions are all connected to the first incision, and the plurality of fourth incisions and the plurality of second incisions are respectively arranged on opposite sides of the first incision along the second direction.

[0017] In a possible implementation, the battery cell further includes an adhesive film, and the adhesive film is disposed between the battery cell surface and the protective film.

[0018] In a possible embodiment, the protective film includes a first part, a second part and a third part connected in sequence along the second direction, and at least part of the first part and at least part of the third part are overlapped at the end of the battery cell surface facing away from the pole lug; the first part has a first through hole, and the third part has a second through hole, and the orthographic projection of the first through hole at the end of the battery cell surface facing away from the pole lug is spaced from the orthographic projection of the second through hole at the end of the battery cell surface facing away from the pole lug.

[0019] In one possible embodiment, the second part includes a first side wall, a top wall and a second side wall connected in sequence along the second direction, the first side wall and the second side wall are covered on two opposite sides of the battery cell surface along the second direction, the top wall is covered on the top surface of the battery cell surface, and the first part and the second part are covered on the bottom surface of the battery cell surface.

[0020] In a possible embodiment, the protective film further includes a fourth portion and a fifth portion arranged on opposite sides of the second portion along the first direction, and the fourth portion and the fifth portion are coated on two opposite side surfaces of the battery cell surface along the first direction.

[0021] In a possible embodiment, the number of the fourth parts is two, the two fourth parts are arranged opposite to each other along the second direction, one fourth part is connected to one side of the first side wall, and the other fourth part is connected to one side of the second side wall; the number of the fifth parts is two, the two fifth parts are arranged opposite to each other along the second direction, one fifth part is connected to the other side of the first side wall, and the other fifth part is connected to the other side of the second side wall; one fourth part and one fifth part are used to cover one side of the battery cell surface along the first direction, and the other fourth part and the other fifth part are used to cover the other side of the battery cell surface along the first direction.

[0022] In a possible implementation, the protective film has one or more folds, and the one or more folds are used to divide the protective film into different parts.

[0023] On the other hand, the present application also provides a power battery, comprising:

[0024] One or more of the above battery cells.

[0025] In one possible implementation, the power battery further includes:

[0026] A fixing structure is used to fix the plurality of battery cells.

[0027] In another aspect, the present application further provides a vehicle, comprising:

[0028] The above-mentioned power battery is used to provide electrical energy for the vehicle.

[0029] The battery cell, power battery and vehicle provided by the present application, by wrapping a protective film on the outside of the battery cell surface to reduce foreign matter, dust and other impurities in the environment from entering the battery cell, is conducive to ensuring the cleanliness of the battery cell during the processing, and thus can improve the quality of the battery cell processed into a finished product. Furthermore, since the protective film has a first incision and a plurality of second incisions, the first incision extends along the first direction, each second incision extends along the second direction, and the plurality of second incisions are arranged in sequence along the first direction, and the first direction is different from the second direction. Thus, after the tab is penetrated by the first incision and the protective film is exposed, the protective film located on both sides of the first incision along the second direction overlaps with the outer wall of the tab to seal the battery cell surface and the tab inside the protective film, which can reduce foreign matter, dust and other impurities in the environment from entering the battery cell from the first incision, further improve the cleanliness of the battery cell during the processing, and improve the quality of the battery cell processed into a finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some implementation methods provided by the embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0031] FIG1 is a structural diagram of a power battery provided by an embodiment of the present application;

[0032] FIG2 is a second structural diagram of a power battery provided in one embodiment of the present application;

[0033] FIG3 is a structural diagram 1 of a battery cell provided in the first embodiment of the present application;

[0034] FIG4 is a second structural diagram of a battery cell provided in the first embodiment of the present application;

[0035] FIG5 is a third structural diagram of a battery cell provided in the first embodiment of the present application;

[0036] FIG6 is a fourth structural diagram of a battery cell provided in the first embodiment of the present application;

[0037] FIG7 is a front view of a protective film provided in the first embodiment of the present application;

[0038] FIG8 is a partial enlarged schematic diagram of the protective film at position A shown in FIG7 ;

[0039] FIG9 is a front view of a protective film provided in a second embodiment of the present application;

[0040] FIG10 is a partial enlarged schematic diagram of the protective film at position B shown in FIG9;

[0041] FIG11 is a front view of a protective film provided in a third embodiment of the present application;

[0042] FIG12 is a partial enlarged schematic diagram of the protective film at position C shown in FIG11;

[0043] FIG13 is a front view of a protective film provided in a fourth embodiment of the present application;

[0044] FIG14 is a partial enlarged schematic diagram of the protective film at position D shown in FIG13 .

[0045] The figure numbers are explained as follows: power battery-1000, fixing structure-200, battery cell-100, battery cell surface-10, adhesive film-20, pole core-30, protective film-50, pole ear-31, first incision-51, second incision-52, third incision-53, fourth incision-54, first part-501, second part-502, third part-503, fourth part-504, fifth part-505, fold-506, first through hole-5010, second through hole-5030, first side wall-5021, top wall-5022, second side wall-5023. DETAILED DESCRIPTION

[0046] The technical solution of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] An embodiment of the present application provides a vehicle, which includes a power battery. The power battery serves as a power source for the vehicle and is used to provide electrical energy for the vehicle. It is understandable that the vehicle provided by the present application includes but is not limited to electric motorcycles, electric vehicles, hybrid vehicles, and other vehicles. It can also be other electrical equipment, such as engineering machinery, medical equipment, etc., and the present application does not impose any restrictions on this. This embodiment takes a car as an example. The vehicle also includes other structures besides the power battery, such as a frame, an engine, wheels, etc. Since the present application mainly improves the power battery, other structures besides the power battery will not be described in detail here.

[0048] Please refer to Figures 1 and 2. Figure 1 is a structural diagram 1 of a power battery provided in one embodiment of the present application, and Figure 2 is a structural diagram 2 of a power battery provided in one embodiment of the present application.

[0049] An embodiment of the present application provides a power battery 1000, which includes a battery cell 100. It is understood that the power battery 1000 may include one, two, three, or other battery cells, and this application does not impose any limitation thereto. When there are multiple battery cells 100, the power battery 1000 further includes a fixing structure 200, which is used to secure the multiple battery cells 100 together to form a single unit.

[0050] Since the quality of the battery cell 100 determines the quality of the power battery 1000 and the vehicle, the present application provides a battery cell 100 that can reduce the amount of foreign matter, dust and other impurities falling into the battery cell 100, thereby improving the quality of the battery cell 100, the power battery 1000 and the vehicle.

[0051] Please refer to Figures 3 to 8, Figure 3 is a structural diagram 1 of a battery cell provided in the first embodiment of the present application, Figure 4 is a structural diagram 2 of a battery cell provided in the first embodiment of the present application, Figure 5 is a structural diagram 3 of a battery cell provided in the first embodiment of the present application, Figure 6 is a structural diagram 4 of a battery cell provided in the first embodiment of the present application, Figure 7 is a front view of a protective film provided in the first embodiment of the present application, and Figure 8 is a partially enlarged schematic diagram of the protective film shown in Figure 7 at point A.

[0052] The first embodiment of the present application provides a battery cell 100, which includes a battery cell surface 10, a pole core 30 and a protective film 50. The pole core 30 is arranged inside the battery cell surface 10, and the pole ear 31 in the pole core 30 is exposed outside the battery cell surface 10. The protective film 50 is covered on the outside of the battery cell surface 10, and the pole ear 31 in the pole core 30 is exposed outside the protective film 50.

[0053] Among them, the protective film 50 is provided with a first incision 51 and multiple second incisions 52, and the first incision 51 and the multiple second incisions 52 are connected. The first incision 51 extends along the first direction, and each second incision 52 extends along the second direction. The multiple second incisions 52 are arranged in sequence along the first direction, and the first direction is different from the second direction. When the protective film 50 is wrapped around the battery cell surface 10 at the end exposed from the tab 31 of the battery cell 100, the tab 31 passes through the first incision 51 and exposes the protective film 50. The protective film 50 located on both sides of the first incision 51 along the second direction contacts the outer wall of the tab 31. At this time, the protective film 50 wraps the battery cell surface 10 and the position on the battery cell surface 10 connected to the tab 31 within the protective film 50.

[0054] Specifically, in the embodiment, the first direction is different from the second direction, for example, the first direction is perpendicular to the second direction. It is understood that in some other embodiments, the first direction and the second direction may not be perpendicular, as long as there is an angle between the first direction and the second direction, and the application itself does not impose any limitation on this.

[0055] It should be understood that in order to prevent the flow of electrical signals between the protective film 50 and the battery cell 100, the protective film 50 provided in this embodiment is an insulating film, and the material of the protective film 50 includes but is not limited to one or more combinations of polyimide, polyethylene, polyvinylidene fluoride, and polytetrafluoroethylene.

[0056] It is understandable that before the tab 31 is penetrated by the first incision 51, the protective film 50 located around the first incision 51 and the second incision 52 is located in the same plane. During the process of the tab 31 penetrating the first incision 51, the tab 31 presses against the protective film 50 and causes the protective film 50 located around the first incision 51 and the second incision 52 to bend elastically, and the protective film 50 located around the first incision 51 and the second incision 52 can elastically adhere to the peripheral side wall of the tab 31, which can reduce the entry of foreign matter, dust and other impurities in the environment into the battery cell 100. After the tab 31 is withdrawn from the first incision 51, the protective film 50 is reset under the action of its own elastic force, and the protective film 50 located around the first incision 51 and the second incision 52 is located in the same plane.

[0057] The battery cell 100, power battery 1000, and vehicle provided herein, by coating the outer surface 10 of the battery cell with a protective film 50, reduces the ingress of foreign matter, dust, and other impurities from the environment into the battery cell 100. This helps ensure the cleanliness of the battery cell 100 during processing, thereby improving the quality of the finished product of the battery cell 100 and power battery. Furthermore, since the protective film 50 has a first incision 51 and multiple second incisions 52, the first incision 51 extends along a first direction, and each second incision 52 extends along a second direction, the multiple second incisions 52 are sequentially spaced along the first direction, and the first direction is different from the second direction. Therefore, after the pole tab 31 passes through the first incision 51 and the protective film 50 is exposed, the protective film 50 located on both sides of the first incision 51 along the second direction overlaps with the outer wall of the pole tab 31 to seal the battery cell surface 10 and the pole tab 31 located inside the protective film 50, which can reduce foreign matter, dust and other impurities in the environment from entering the battery cell 100 through the first incision 51, further improve the cleanliness of the battery cell 100 during the processing process, and improve the quality of the battery cell 100 processed into a finished product.

[0058] It should be understood that, in the battery cell 100 provided in this embodiment, the protective film 50 covers the battery cell surface 10 of the battery cell 100 starting from the end where the tab 31 is set on the battery cell 100. In this way, foreign matter, dust and other impurities in the environment can be prevented from falling onto the surface where the protective film 50 contacts the battery cell surface 10, thereby improving the cleanliness of the battery cell 100 during the processing process and improving the quality of the battery cell 100 processed into a finished product.

[0059] In the first embodiment of the present application, the two opposite sides of the first incision 51 along the second direction are in contact with each other. In other words, before the first incision 51 is formed on the tab 31, the protective film 50 on the two opposite sides of the first incision 51 along the second direction is in contact with each other. This prevents foreign matter, dust, and other impurities from entering the battery cell 100 through the first incision 51 before the protective film 50 is covered and assembled on the battery cell surface 10 of the battery cell 100. This helps to improve the cleanliness of the battery cell 100 during processing and improves the quality of the finished product processed from the battery cell 100.

[0060] In the first embodiment of the present application, the battery cell 100 further includes an adhesive film 20, which is disposed between the battery cell surface 10 and the protective film 50. The provision of the adhesive film 20 allows the protective film 50 to be more firmly attached to the battery cell surface 10 of the battery cell 100, thereby reducing the risk of the protective film 50 falling off the battery cell 100.

[0061] In the first embodiment of the present application, the protective film 50 includes a first portion 501, a second portion 502, and a third portion 503 connected in sequence along a second direction. When the protective film 50 is coated on the cell surface 10 of the battery cell 100, at least a portion of the first portion 501 and at least a portion of the third portion 503 overlap at an end of the cell surface 10 facing away from the tab 31. The first portion 501 has a first through hole 5010, and the third portion 503 has a second through hole 5030. The orthographic projection of the first through hole 5010 at the end of the cell surface 10 facing away from the tab 31 is spaced apart from the orthographic projection of the second through hole 5030 at the end of the cell surface 10 facing away from the tab 31. The first through hole 5010 is further away from the cell surface 10 of the battery cell 100 than the second through hole 5030. In this manner, the first through-hole 5010 and the second through-hole 5030 are staggered so that the bottom of the battery cell surface 10 is completely covered by the first portion 501 and the third portion 503 of the protective film 50. The bottom surface of the battery cell surface 10 is not exposed outside the protective film 50, which helps to improve the insulation and sealing effect of the protective film 50 on the battery cell surface 10 of the battery cell 100. Furthermore, the staggered arrangement of the first through-hole 5010 and the second through-hole 5030 makes it difficult for the electrolyte in the battery cell surface 10 to flow out of the first through-hole 5010 and the second through-hole 5030, thereby preventing electrolyte leakage and improving the quality of the finished battery cell 100.

[0062] It is understandable that the opening shapes of the first through hole 5010 and the second through hole 5030 can be circular, polygonal, elliptical, etc., and this application does not impose any limitation on this.

[0063] In the first embodiment of the present application, the second portion 502 includes a first sidewall 5021, a top wall 5022, and a second sidewall 5023 connected in sequence along the second direction. The first sidewall 5021 and the second sidewall 5023 are coated on two opposite sides of the battery cell surface 10 along the second direction. The top wall 5022 is coated on the top surface of the battery cell surface 10. The first portion 501 and the second portion 502 are coated on the bottom surface of the battery cell surface 10. The protective film 50 also includes a fourth portion 504 and a fifth portion 505 disposed on opposite sides of the second portion 502 along the first direction. The fourth portion 504 and the fifth portion 505 are coated on two opposite sides of the battery cell surface 10 along the first direction. There are two fourth portions 504, which are spaced apart along the second direction. One fourth portion 504 is connected to one side of the first sidewall 5021, and the other fourth portion 504 is connected to one side of the second sidewall 5023. There are two fifth portions 505, spaced apart along the second direction. One fifth portion 505 is connected to the other side of the first sidewall 5021, and the other fifth portion 505 is connected to the other side of the second sidewall 5023. One fourth portion 504 and one fifth portion 505 are used to cover one side of the battery cell surface 10 along the first direction, while another fourth portion 504 and another fifth portion 505 are used to cover the other side of the battery cell surface 10 along the first direction. By covering the outer surface 10 of the battery cell 100 with the first portion 501, the second portion 502, the third portion 503, the fourth portion 504, and the fifth portion 505, foreign matter, dust, and other impurities can be prevented from entering the interior of the battery cell 100 and affecting the quality of the finished battery cell 100.

[0064] To facilitate different portions of the protective film 50 corresponding to different sides of the battery cell surface 10, so that the protective film 50 is closely attached to the surface of the battery cell surface 10, a plurality of folds 506 are provided on the protective film 50. In this embodiment, a fold 506 is provided between the first portion 501 and the first sidewall 5021, a fold 506 is provided between the first sidewall 5021 and the top wall 5022, a fold 506 is provided between the top wall 5022 and the second sidewall 5023, a fold 506 is provided between the second sidewall 5023 and the third portion 503, a fold 506 is provided between one fourth portion 504 and the first sidewall 5021, a fold 506 is provided between another fourth portion 504 and the second sidewall 5023, a fold 506 is provided between one fifth portion 505 and the first sidewall 5021, and a fold 506 is provided between another fifth portion 505 and the second sidewall 5023.

[0065] Please refer to FIG. 9 and FIG. 10 . FIG. 9 is a front view of a protective film provided in the second embodiment of the present application. FIG. 10 is a partial enlarged schematic diagram of a portion B of the protective film shown in FIG. 9 .

[0066] The battery cell 100 provided in the second embodiment of the present application is substantially the same as the battery cell 100 provided in the first embodiment of the present application, except that the first incision 51 in the battery cell 100 provided in the second embodiment of the present application is different from the first incision 51 located on the protective film 50 in the battery cell 100 provided in the first embodiment of the present application.

[0067] The second embodiment of the present application provides first incisions 51 spaced apart on opposite sides along the second direction, and multiple second incisions 52 are all located on the same side of the first incision 51 in the second direction. The tab 31 passes through the first incision 51, exposing the protective film 50. The protective film 50 located on both sides of the first incision 51 in the second direction contacts the outer wall of the tab 31. Thus, because the first incisions 51 are spaced apart on opposite sides along the second direction, the tab 31 can pass through the protective film 50, which in turn facilitates the protective film 50 covering the exterior of the cell surface 10.

[0068] It is understandable that the opening shape of the first incision 51 includes but is not limited to a long rectangle, a circular ring, a half I-shape, etc., that is, the opening shape of the first incision 51 can be determined according to the shape of the pole ear 31 of the pole core 30, and this application does not impose any restrictions on this.

[0069] Please refer to FIG. 11 and FIG. 12 . FIG. 11 is a front view of a protective film provided in the third embodiment of the present application. FIG. 12 is a partial enlarged schematic diagram of a portion C of the protective film shown in FIG. 11 .

[0070] The battery cell 100 provided in the third embodiment of the present application is substantially the same as the battery cell 100 provided in the second embodiment of the present application, except that a third incision 53 is newly provided on the protective film 50 in the battery cell 100 provided in the third embodiment of the present application compared to the battery cell 100 provided in the second embodiment of the present application.

[0071] The battery cell 100 provided in the third embodiment of the present application is based on the battery cell 100 provided in the second embodiment of the present application, and a third incision 53 is added. That is, the protective film 50 also has a third incision 53, which is connected to the first incision 51 and extends along the first direction. The protective film 50 located on both sides of the first incision 51 along the second direction contacts the outer wall of the tab 31, and the protective film 50 located on both sides of the third incision 53 along the second direction also contacts the outer wall of the tab 31. In this way, due to the provision of the third incision 53, when the tab 31 is slightly larger than the size of the first incision 51 along the first direction, the tab 31 can pass through the third incision 53 and be exposed outside the protective film 50, which is conducive to improving the compatibility of the protective film 50 with battery cells 100 having tabs 31 of different sizes. Moreover, by setting the third incision 53, the protective film 50 on both sides of the third incision 53 along the second direction can contact the outer wall of the tab 31, which is beneficial to further improve the cleanliness of the battery cell 100 during the processing process and improve the quality of the finished product of the battery cell 100.

[0072] It can be understood that before the tab 31 is penetrated by the first incision 51, the protective film 50 located around the first incision 51, the second incision 52 and the third incision 53 is located in the same plane. During the process of the tab 31 penetrating the first incision 51, the tab 31 presses against the protective film 50 and causes the protective film 50 located around the first incision 51, the second incision 52 and the third incision 53 to bend elastically, and the protective film 50 located around the first incision 51, the second incision 52 and the third incision 53 can elastically adhere to the peripheral side wall of the tab 31, which can reduce the entry of foreign matter, dust and other impurities in the environment into the battery cell 100. After the tab 31 is withdrawn from the first incision 51, the protective film 50 is reset under the action of its own elastic force, and the protective film 50 located around the first incision 51, the second incision 52 and the third incision 53 is located in the same plane.

[0073] Furthermore, in the third embodiment of the present application, there are two third incisions 53 in the battery cell 100. Both third incisions 53 are connected to the first incision 51, and both third incisions 53 extend along the first direction. The two third incisions 53 are respectively arranged on opposite sides of the first incision 51 along the first direction. In this way, through the provision of the two third incisions 53, when the tab 31 is slightly larger than the size of the first incision 51 along the first direction, the tab 31 can pass through the third incision 53 and be exposed outside the protective film 50, which is conducive to further improving the compatibility of the protective film 50 with battery cells 100 with tabs 31 of different sizes. Moreover, through the provision of the third incision 53, the protective film 50 on both sides of the third incision 53 along the second direction can contact the outer wall of the tab 31, which is conducive to further improving the cleanliness of the battery cell 100 during the processing process and improving the quality of the battery cell 100 processed into a finished product.

[0074] Please refer to FIG. 13 and FIG. 14 . FIG. 13 is a front view of a protective film provided in the fourth embodiment of the present application. FIG. 14 is a partial enlarged schematic diagram of a portion D of the protective film shown in FIG. 13 .

[0075] The battery cell 100 provided in the fourth embodiment of the present application is substantially the same as the battery cell 100 provided in the third embodiment of the present application, except that a fourth cutout 54 is newly provided in the battery cell 100 provided in the fourth embodiment of the present application compared to the battery cell 100 provided in the third embodiment of the present application.

[0076] The battery cell 100 provided in the fourth embodiment of the present application is based on the battery cell 100 provided in the third embodiment of the present application, and a fourth incision 54 is newly provided. That is, the protective film 50 also has a plurality of fourth incisions 54, each of which extends along the second direction, and a plurality of second incisions 52 are arranged in sequence along the first direction. The plurality of fourth incisions 54 are all connected to the first incision 51, and the plurality of fourth incisions 54 and the plurality of second incisions 52 are respectively arranged on opposite sides of the first incision 51 along the second direction. In this way, due to the arrangement of the fourth incision 54, when the tab 31 is slightly larger than the size of the first incision 51 along the second direction, the tab 31 can pass through the fourth incision 54 and be exposed outside the protective film 50, which is conducive to improving the compatibility of the protective film 50 with battery cells 100 with tabs 31 of different sizes.

[0077] It is understandable that before the tab 31 is penetrated by the first incision 51, the protective film 50 located around the first incision 51, the second incision 52, the third incision 53, and the fourth incision 54 is located in the same plane. During the process of the tab 31 penetrating the first incision 51, the tab 31 abuts against the protective film 50 and causes the protective film 50 located around the first incision 51, the second incision 52, the third incision 53, and the fourth incision 54 to be elastically bent. Moreover, the protective film 50 located around the first incision 51, the second incision 52, the third incision 53, and the fourth incision 54 can elastically adhere to the peripheral side wall surface of the tab 31, thereby reducing the entry of foreign matter, dust, and other impurities in the environment into the battery cell 100. After the tab 31 is withdrawn from the first incision 51 , the protective film 50 is restored under the action of its own elastic force, and the protective film 50 located around the first incision 51 , the second incision 52 , the third incision 53 and the fourth incision 54 is located in the same plane.

[0078] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A battery cell (100), characterized in that: include: A pole core (30) is arranged inside the battery core surface (10), and a pole ear (31) in the pole core (30) extends outside the battery core surface (10); and A protective film (50) is coated on the outside of the battery cell surface (10), the protective film (50) having a first incision (51) and a plurality of second incisions (52), the first incision (51) and the plurality of second incisions (52) being connected; the first incision (51) is extended along a first direction, each of the second incisions (52) is extended along a second direction, the plurality of second incisions (52) are sequentially spaced along the first direction, and the first direction is different from the second direction; the pole lug (31) is penetrated by the first incision (51) and the protective film (50) is exposed, and the protective film (50) located on both sides of the first incision (51) along the second direction is in contact with the outer side wall of the pole lug (31).

2. The battery cell (100) according to claim 1, characterized in that: There is an angle between the first direction and the second direction.

3. The battery cell (100) according to claim 1 or 2, characterized in that: The protective film (50) is an insulating film.

4. The battery cell (100) according to any one of claims 1 to 3, characterized in that: Two opposite sides of the first cutout (51) along the second direction are in contact with each other.

5. The battery cell (100) according to any one of claims 1 to 3, characterized in that: The first incision (51) is spaced apart from each other on two opposite sides along the second direction, and a plurality of the second incisions (52) are all arranged on the same side of the first incision (51) in the second direction; the pole lug (31) passes through the first incision (51) and exposes the protective film (50), and the protective film (50) located on both sides of the first incision (51) along the second direction contacts the outer side wall of the pole lug (31).

6. The battery cell (100) according to any one of claims 1 to 5, characterized in that: The protective film (50) can be elastically bent and can be reset under the action of its own elastic force.

7. The battery cell (100) according to any one of claims 1 to 6, characterized in that: The protective film (50) further has a third cutout (53), the third cutout (53) is connected to the first cutout (51), the third cutout (53) extends along the first direction, and the protective film (50) located on both sides of the third cutout (53) along the second direction contacts the outer side wall of the pole lug (31).

8. The battery cell (100) according to claim 7, characterized in that: There are two third incisions (53), both of which are connected to the first incision (51), both of which extend along the first direction, and the two third incisions (53) are respectively arranged on opposite sides of the first incision (51) along the first direction.

9. The battery cell (100) according to any one of claims 1 to 8, characterized in that: The protective film (50) further comprises a plurality of fourth cutouts (54), each of the fourth cutouts (54) extending along the second direction, and the plurality of second cutouts (52) being arranged in sequence and spaced apart along the first direction; the plurality of fourth cutouts (54) are all connected to the first cutout (51), and the plurality of fourth cutouts (54) and the plurality of second cutouts (52) are respectively arranged on opposite sides of the first cutout (51) along the second direction.

10. The battery cell (100) according to any one of claims 1 to 9, characterized in that: The battery cell (100) further comprises an adhesive film (20), wherein the adhesive film (20) is arranged between the battery cell surface (10) and the protective film (50).

11. The battery cell (100) according to any one of claims 1 to 10, characterized in that: The protective film (50) comprises a first portion (501), a second portion (502) and a third portion (503) connected in sequence along a second direction, at least a portion of the first portion (501) and at least a portion of the third portion (503) being disposed on the surface of the battery cell. The first portion (501) is provided with a first through hole (5010), and the third portion (503) is provided with a second through hole (5030), wherein the orthographic projection of the first through hole (5010) on the end of the battery cell surface (10) away from the pole lug (31) is spaced from the orthographic projection of the second through hole (5030) on the end of the battery cell surface (10) away from the pole lug (31).

12. The battery cell (100) according to claim 11, characterized in that: The second part (502) comprises a first side wall (5021), a top wall (5022) and a second side wall (5023) which are sequentially connected along the second direction; the first side wall (5021) and the second side wall (5023) are coated on two opposite side surfaces of the battery cell surface (10) along the second direction; the top wall (5022) is coated on the top surface of the battery cell surface (10); and the first part (501) and the second part (502) are coated on the bottom surface of the battery cell surface (10).

13. The battery cell (100) according to claim 11 or 12, characterized in that: The protective film (50) further comprises a fourth portion (504) and a fifth portion (505) arranged on opposite sides of the second portion (502) along the first direction, and the fourth portion (504) and the fifth portion (505) are coated on two opposite sides of the battery cell surface (10) along the first direction.

14. The battery cell (100) according to claim 13, characterized in that: The number of the fourth parts (504) is two, the two fourth parts (504) are arranged opposite to each other along the second direction, one of the fourth parts (504) is connected to one side of the first side wall (5021), and the other of the fourth parts (504) is connected to one side of the second side wall (5023); the number of the fifth parts (505) is two, the two fifth parts (505) are arranged opposite to each other along the second direction, one of the fifth parts (505) is connected to the other side of the first side wall (5021), and the other of the fifth parts (505) is connected to the other side of the second side wall (5023); one of the fourth parts (504) and one of the fifth parts (505) are used to cover one side of the battery cell surface (10) along the first direction, and the other of the fourth parts (504) and the other of the fifth parts (505) are used to cover the other side of the battery cell surface (10) along the first direction.

15. The battery cell (100) according to any one of claims 11 to 14, characterized in that: The protective film (50) has one or more folds (506), and the one or more folds (506) are used to divide different parts of the protective film (50).

16. A power battery (1000), characterized in that: include: One or more battery cells (100) according to any one of claims 1 to 15.

17. The power battery (1000) according to claim 16, characterized in that: Also includes: A fixing structure (200), wherein the fixing structure (200) is used to fix a plurality of the battery cells (100).

18. A vehicle, characterized in that: include: The power battery (1000) according to claim 16 or 17, wherein the power battery (1000) is used to provide electrical energy for the vehicle.

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