Battery cell and battery

Abstract

The utility model discloses an electric core and a battery, which are applied to the technical field of batteries, the electric core comprises a roll core and a packaging film, the packaging film is enclosed to form an accommodating cavity, and the roll core is positioned in the accommodating cavity; the packaging film comprises a first insulating layer, an electric heating layer and a second insulating layer which are sequentially arranged in the direction close to the containing cavity. One side, deviating from the accommodating cavity, of the electric heating layer is provided with at least one first exposed area, the first insulating layer does not cover the first exposed area, and the first exposed area is used for being electrically connected with a power supply end; and / or one side, close to the accommodating cavity, of the electric heating layer is provided with at least one second exposed area, the second insulating layer does not cover the second exposed area, and the second exposed area is used for being electrically connected with the power supply end. According to the utility model, the electric heating layer in the packaging film is charged to heat the battery core, so that the charging and fast charging of the battery in a low-temperature environment are realized, and meanwhile, the charging speed can be further improved in a normal-temperature environment, so that the safety risk caused by lithium precipitation during charging is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially a kind of battery and battery. BACKGROUND

[0002] Lithium ion battery as a kind of secondary battery, due to higher energy density and better charge-discharge cycle ability, now widely used in mobile phone, notebook computer, electric vehicle. Low temperature charging capacity has been the pain point of lithium ion battery, there is the risk of lithium precipitation when charging lithium ion battery at low temperature. Many normal temperature supports fast charging lithium ion battery to low temperature environment cannot support fast charging, even cannot charge. Therefore, it is particularly important to develop a kind of soft package battery supporting low temperature charging even low temperature fast charging. SUMMARY

[0003] Therefore, the utility model discloses a kind of battery and battery, to realize the charging and fast charging of battery in low temperature environment.

[0004] To solve the above technical problems, the utility model provides a kind of battery, comprising: roll core and packaging film, the packaging film is enclosed to form accommodating cavity, the roll core is located in the accommodating cavity;

[0005] The packaging film includes first insulating layer, electric heating layer and second insulating layer arranged in the direction close to the accommodating cavity;

[0006] The side of the electric heating layer away from the accommodating cavity is provided with at least one first exposed area, the first insulating layer does not cover the first exposed area, and the first exposed area is used to be electrically connected with power supply end;And / or,

[0007] The side of the electric heating layer close to the accommodating cavity is provided with at least one second exposed area, and the second insulating layer does not cover the second exposed area, and the second exposed area is used to be electrically connected with power supply end.

[0008] Optionally, the electric heating layer includes an exposed area, the exposed area is arranged on the surface of the packaging film on one side of the roll core along its thickness direction, and the exposed area includes the first exposed area or the second exposed area;

[0009] Or, the electric heating layer includes at least two exposed areas, and the surfaces of the packaging film on both sides of the roll core along its thickness direction are respectively provided with at least one exposed area, and the exposed area includes the first exposed area and / or the second exposed area.

[0010] Optionally, the packaging film encloses to form a body, a top sealing edge arranged on the top of the body, and two side sealing edges arranged on the opposite sides of the body.

[0011] The top sealing edge and / or the side sealing edge extends in a direction away from the body to form an extension, and the electric heating layer in the extension forms the first exposed area and / or the second exposed area.

[0012] Optionally, the top sealing edge includes two extensions, and in the orthographic projection in the thickness direction of the battery cell, the two extensions at least partially overlap; and / or,

[0013] The side sealing edge includes two extensions, and in the orthographic projection in the thickness direction of the battery cell, the two extensions at least partially overlap.

[0014] Optionally, the top sealing edge includes two extensions, and in the orthographic projection in the thickness direction of the battery cell, the two extensions do not overlap, the winding core includes two tabs, the two tabs extend on the top sealing edge in a direction away from the battery cell, and the extensions are located between the two tabs; and / or,

[0015] The side sealing edge includes two extensions, and in the orthographic projection in the thickness direction of the battery cell, the two extensions do not overlap, and the two extensions are located on the same side sealing edge or on two side sealing edges respectively.

[0016] Optionally, the top sealing edge and the side sealing edge each include two layers of the packaging film stacked, and the two extensions are located in the packaging film of adjacent layers respectively.

[0017] Optionally, the packaging film circumscribes to form a body, a top sealing edge arranged on the top of the body, and two side sealing edges arranged on opposite sides of the body;

[0018] The body is provided with at least one first exposed area, one end of a conductive connecting piece is electrically connected to the first exposed area, the other end of the conductive connecting piece is electrically connected to the power supply end, and the packaging film further includes a third insulating layer, the third insulating layer is located on the second insulating layer and covers the first exposed area and the conductive connecting piece.

[0019] Optionally, the first insulating layer includes a nylon layer;

[0020] And / or, the electric heating layer includes an aluminum layer, an aluminum alloy layer or a stainless steel layer;

[0021] And / or, the second insulating layer includes a polypropylene layer;

[0022] And / or, a first adhesive layer is arranged between the first insulating layer and the electric heating layer;

[0023] And / or, a second adhesive layer is arranged between the second insulating layer and the electric heating layer.

[0024] To solve the above technical problems, the utility model provides a kind of battery, comprising: the battery as described above is electric core, the battery includes power supply end, the power supply end includes the first electrode and second electrode of external power supply;

[0025] The first electrode is electrically connected with the first exposed area and / or the second exposed area, and the second electrode is electrically connected with the first exposed area and / or the second exposed area.

[0026] Optionally, the battery further comprises a temperature acquisition element, a switching element and a control system.

[0027] The temperature acquisition element is electrically connected with the control system, the first exposed area and the second exposed area are electrically connected with the switching element, and the switching element is electrically connected with the control system.

[0028] It can be seen that the utility model includes: roll core and packaging film, the packaging film is enclosed to form a containing cavity, and the roll core is located in the containing cavity; the packaging film includes a first insulating layer, an electric heating layer and a second insulating layer arranged in sequence along the direction close to the containing cavity; at least one first exposed area is provided on the side of the electric heating layer away from the containing cavity, the first insulating layer does not cover the first exposed area, and the first exposed area is used for electrically connecting with the power supply end; and / or at least one second exposed area is provided on the side of the electric heating layer close to the containing cavity, the second insulating layer does not cover the second exposed area, and the second exposed area is used for electrically connecting with the power supply end. The utility model charges the electric heating layer in the packaging film to heat the electric core, so as to realize the charging and fast charging of the battery in a low-temperature environment, and the charging speed can also be further improved in a normal-temperature environment, so as to avoid the safety risk caused by lithium precipitation during charging. The utility model also provides a battery, which has the above beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the utility model, and those skilled in the art can obtain other drawings according to the provided drawings without creating any creative labor.

[0030] Figure 1 A cross-sectional view of the packaging film in the length direction of the electric core is provided for the embodiments of the utility model.

[0031] Figure 2 A cross-sectional view of the packaging film after laser cleaning in the length direction of the electric core is provided for the embodiments of the utility model.

[0032] Figure 3 A schematic view of the exposed electric heating layer and the power supply end electric connection provided by the utility model embodiment;

[0033] Figure 4 A structure schematic view of the extension part of the top sealing edge completely overlapping provided by the utility model embodiment;

[0034] Figure 5 A structure schematic view of the extension part of the top sealing edge not completely overlapping provided by the utility model embodiment;

[0035] Figure 6 A structure schematic view of the extension part of the side sealing edge completely overlapping provided by the utility model embodiment;

[0036] Figure 7 A structure schematic view of the extension part of the side sealing edge not completely overlapping provided by the utility model embodiment;

[0037] Figure 8 A structure schematic view with one exposed area provided by the utility model embodiment;

[0038] Figure 9 A structure schematic view with a conductive connecting piece provided by the utility model embodiment;

[0039] Figure 10 A structure schematic view of a conventional battery.

[0040] The reference signs are explained as follows:

[0041] 1 - roll core, 11 - tab, 12 - positive pole piece, 13 - negative pole piece, 14 - isolation film, 15 - insulating piece, 2 - packaging film, 21 - first insulating layer, 22 - first adhesive layer, 23 - electric heating layer, 24 - second adhesive layer, 25 - second insulating layer, 3 - extension part, 4 - first exposed area, 51 - first electrode, 52 - second electrode, 6 - conductive connecting piece, 7 - electrolyte. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the utility model embodiments clearer, the technical scheme in the utility model embodiments will be described clearly and completely below in combination with the drawings in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0043] REFERENCE Figures 1 to 9The utility model embodiment provides a kind of electric core, can include: roll core 1 and packaging film 2, packaging film 2 is enclosed and forms accommodation cavity, and roll core 1 is located in accommodation cavity;

[0044] Packaging film 2 includes first insulating layer 21, electric heating layer 23 and second insulating layer 25 sequentially arranged along the direction close to accommodation cavity;

[0045] Electric heating layer 23 is provided with at least one first exposed area 4 on the side away from accommodation cavity, and first insulating layer 21 does not cover first exposed area 4, and first exposed area 4 is used to be electrically connected with power supply end;And / or,

[0046] Electric heating layer 23 is provided with at least one second exposed area on the side close to accommodation cavity, and second insulating layer 25 does not cover second exposed area, and second exposed area is used to be electrically connected with power supply end.

[0047] The embodiment is not limited to the specific number of exposed area, and different positions can be selected to set exposed area according to the specific number of exposed area, for example, the following structure can be included:

[0048] Electric heating layer 23 includes one exposed area, and the exposed area is arranged on the surface of packaging film 2 on the side of roll core 1 along its thickness direction, and the exposed area includes first exposed area 4 or second exposed area;

[0049] Or, electric heating layer 23 includes at least two exposed areas, and the surface of packaging film 2 on the two sides of roll core 1 along its thickness direction is respectively provided with at least one exposed area, and the exposed area includes first exposed area 4 and / or second exposed area.

[0050] It should be noted that the power supply end includes first electrode 51 and second electrode 52 (in the embodiment, one of first electrode 51 and second electrode 52 represents positive, and the other represents negative.), two electrodes of power supply end in the former structure are electrically connected with the same exposed area;Two electrodes of power supply end in the latter structure can be electrically connected with different exposed areas respectively.The exposed area of the embodiment is arranged on the packaging film 2 on the two sides of roll core 1 along its thickness direction, which can increase the path of current from one exposed area to another exposed area, so as to increase the impedance of electric heating layer 23 between exposed areas, and then the heating efficiency can be improved.

[0051] The embodiment is not limited to the specific structure of packaging film 2, and different positions can be selected to set exposed area according to the specific structure of packaging film 2, for example, the following structure can be included:

[0052] (1) packaging film 2 is enclosed and forms including body, and top sealing edge arranged at the top of body, and two side sealing edges arranged at opposite sides of body;

[0053] The top sealing edge and / or the side sealing edge extends in a direction away from the body to form an extension 3, and the electric heating layer 23 in the extension 3 is formed with a first exposed area 4 and / or a second exposed area.

[0054] The embodiments are not limited to the specific number and position of the extension 3, for example, the following structures can be included:

[0055] 1) The top sealing edge includes two extensions 3, and in the orthographic projection in the thickness direction of the battery cell, the two extensions 3 at least partially overlap; and / or,

[0056] The side sealing edge includes two extensions 3, and in the orthographic projection in the thickness direction of the battery cell, the two extensions 3 at least partially overlap.

[0057] Further, in the embodiments, the top sealing edge and the side sealing edge each include two layers of packaging films 2 stacked together, and the two extensions 3 are located in the adjacent layers of the packaging films 2. It should be noted that in this structure, each extension 3 includes one layer of packaging film 2, and the electric heating layer 23 in each extension 3 is formed with a first exposed area 4.

[0058] 2) The top sealing edge includes two extensions 3, and in the orthographic projection in the thickness direction of the battery cell, the two extensions 3 do not overlap, the roll core 1 includes two tabs 11, and the two tabs 11 extend in a direction away from the battery cell on the top sealing edge, and the two extensions 3 are located between the two tabs 11; and / or,

[0059] The side sealing edge includes two extensions 3, and in the orthographic projection in the thickness direction of the battery cell, the two extensions 3 do not overlap, and the two extensions 3 are located on the same side sealing edge, or the two extensions 3 are located on two side sealing edges respectively.

[0060] Further, in the embodiments, the top sealing edge and the side sealing edge can each include two layers of packaging films 2 stacked together; each extension 3 can include one layer of packaging film 2 or two layers of packaging films 2 stacked together; when each extension 3 includes one layer of packaging film 2, the two extensions 3 can be located in the adjacent layers of the packaging films 2 or in the same layer of the packaging films 2; and the electric heating layer 23 in each extension 3 can be formed with a first exposed area 4 and / or a second exposed area.

[0061] It should be noted that in the embodiments, the two exposed areas (the first exposed area 4 and / or the second exposed area) can be electrically connected to the two tabs 11 of the roll core 1 one by one, and the ohmic resistance between the two exposed areas is greater than or equal to the ohmic resistance inside the roll core 1. This structure directly supplies power to the electric heating layer 23 through the tabs 11 of the roll core 1, and at the same time, by ensuring that the ohmic resistance between the two exposed areas is greater than or equal to the ohmic resistance inside the roll core 1, the heating efficiency of the electric heating layer 23 can be improved.

[0062] For specific reference, Figures 1 to 5 For example, Figure 1The top sealing edge of the packaging film 2 in the shown battery cell is obtained by heat sealing two layers of the packaging film 2, and a part of the two layers of the packaging film 2 extends out of the top sealing edge. The outer surface of the packaging film 2 extending out of the top sealing edge is cleaned by a laser cleaning method to remove part of the first insulating layer 21 and the first adhesive layer 22, so that the electric heating layer 23 in the two layers of the packaging film 2 is exposed (as shown in Figure 2 The extension 3 is used to connect the power supply end of the external power supply (as shown in Figure 3 ). In the orthographic projection of the extension 3 in the thickness direction of the battery cell, the two layers of the packaging film 2 can completely overlap, partially overlap, or not overlap. For example, as shown in Figure 4 , a completely overlapping structure of the extension 3 is provided, two extensions 3 are arranged between the two tabs 11, the two extensions 3 each include one layer of the packaging film 2, the two extensions 3 completely overlap in the orthographic projection in the thickness direction of the battery cell, and the outer surfaces of the two extensions 3 each are provided with a first exposed area 4. As shown in Figure 5 , a non-overlapping structure of the extension 3 is provided, two extensions 3 are arranged between the two tabs 11, the two extensions 3 each include two layers of the packaging film 2, and the two extensions 3 do not overlap in the orthographic projection in the thickness direction of the battery cell. The outer surfaces of the two extensions 3 each are provided with a first exposed area 4.

[0063] For details, please refer to Figure 6 and Figure 7 . The side sealing edge of the packaging film 2 in the battery cell is obtained by heat sealing two layers of the packaging film 2, and a part of the two layers of the packaging film 2 extends out of the side sealing edge. The outer surface of the packaging film 2 extending out of the side sealing edge is cleaned by a laser cleaning method to remove part of the first insulating layer 21 and the first adhesive layer 22, so that the electric heating layer 23 in the two layers of the packaging film 2 is exposed. The extension 3 is used to connect the power supply end of the external power supply. In the orthographic projection of the extension 3 in the thickness direction of the battery cell, the two layers of the packaging film 2 can completely overlap, partially overlap, or not overlap. For example, as shown in Figure 6 , a completely overlapping structure of the extension 3 is provided, two extensions 3 are arranged between the two tabs 11, the two extensions 3 each include one layer of the packaging film 2, the two extensions 3 completely overlap in the orthographic projection in the thickness direction of the battery cell, and the outer surfaces of the two extensions 3 each are provided with a first exposed area 4. As shown in Figure 7 , a non-overlapping structure of the extension 3 is provided, two extensions 3 are arranged between the two tabs 11, the two extensions 3 each include two layers of the packaging film 2, and the two extensions 3 do not overlap in the orthographic projection in the thickness direction of the battery cell. The outer surfaces of the two extensions 3 each are provided with a first exposed area 4.

[0064] (2) The packaging film 2 is enclosed to form a body, a top sealing edge arranged at the top of the body, and two side sealing edges arranged at opposite sides of the body; the body is provided with at least one first exposed area 4. For details, please refer to Figure 8 In this structure, the body is provided with one first exposed area 4. In order to avoid the size increase of the packaging film 2 caused by the extension of the packaging film 2, the packaging film 2 can not extend out a part, but directly expose the electric heating layer 23 on the body of the packaging film 2 by laser cleaning.

[0065] Further, the first exposed area 4 and one end of the conductive connecting piece 6 are electrically connected, the other end of the conductive connecting piece 6 and the power supply end are electrically connected, and the packaging film 2 further comprises a third insulating layer, which is located on the second insulating layer 25 and covers the first exposed area 4 and the conductive connecting piece 6. For details, please refer to Figure 9 In order to avoid the risk of packaging reliability caused by the exposure of the electric heating layer 23 of the packaging film 2, the electric heating layer 23 of the packaging film 2 can also not be exposed. Specifically, first, expose part of the electric heating layer 23 by laser cleaning, then connect the conductive connecting piece 6 with the exposed electric heating layer 23, and finally cover the exposed electric heating layer 23 and the conductive connecting piece 6 with the third insulating layer.

[0066] The embodiment does not limit the specific type of the first insulating layer 21. The first insulating layer 21 can include, but is not limited to, a nylon layer. It should be noted that nylon is a common material in the prior art. The embodiment does not limit the internal components of the first insulating layer 21, but directly uses a film layer made of an existing material as the first insulating layer 21. The embodiment does not limit the specific number of the first insulating layer 21, which can be determined according to actual conditions.

[0067] The embodiment does not limit the specific type of the electric heating layer 23. The electric heating layer 23 can include, but is not limited to, an aluminum layer, an aluminum alloy layer, or a stainless steel layer. It should be noted that aluminum, aluminum alloy, and stainless steel are common materials in the prior art. The embodiment does not limit the internal components of the electric heating layer 23, but directly uses a film layer made of an existing material as the electric heating layer 23. The embodiment does not limit the specific number of the electric heating layer 23, which can be determined according to actual conditions.

[0068] The embodiment is not limited to the specific type of the second edge layer, and the second insulating layer 25 can but is not limited to including a polypropylene layer. It should be noted that polypropylene is a common material in the prior art, and the embodiment is not limited to the internal components of the second insulating layer 25, but directly uses a film layer made of an existing material as the second insulating layer 25. The embodiment is not limited to the specific number of the second insulating layer 25, and the specific number of the second insulating layer 25 can be determined according to actual conditions. When the top sealing edge and the side sealing edge each include two layers of the packaging film 2 stacked, the second insulating layer 25 adopts a polypropylene layer, and the polypropylene layers in the two layers of the packaging film 2 can be bonded by heating, thereby forming the top sealing edge and the side sealing edge.

[0069] Further, in order to improve the stability of the structure, the first adhesive layer 22 can be arranged between the first insulating layer 21 and the electric heating layer 23 in the embodiment, and / or the second adhesive layer 24 can be arranged between the second insulating layer 25 and the electric heating layer 23.

[0070] Based on the above embodiment, the electric heating layer in the packaging film is charged to heat the battery cell, so as to realize charging and fast charging of the battery in a low-temperature environment, and the charging speed can also be further improved at normal temperature, thereby avoiding the safety risk caused by lithium precipitation during charging.

[0071] The battery provided by the embodiment of the utility model can include the battery cell as described above, and the battery includes a power supply end including a first electrode 51 and a second electrode 52 of an external power supply.

[0072] The first electrode 51 is electrically connected to the first exposed area 4 and / or the second exposed area, and the second electrode 52 is electrically connected to the first exposed area 4 and / or the second exposed area.

[0073] Further, the battery in the embodiment can further include a temperature acquisition element, a switching element and a control system.

[0074] The temperature acquisition element and the control system are electrically connected, the first exposed area 4 and the second exposed area are electrically connected to the switching element, and the switching element and the control system are electrically connected.

[0075] It should be noted that the control system in the embodiment can control the conduction and disconnection of the switching element according to the temperature signal of the battery cell collected by the temperature acquisition element. When the switching element is conducted, the current flows through the electric heating layer 23 and makes the electric heating layer 23 heat; when the switching element is disconnected, the electric heating layer 23 stops heating.

[0076] The embodiment is not limited to the specific type of temperature collecting element, which can be any temperature sensing element. The embodiment is not limited to the specific type of switch element, as long as it can realize the switching of the on and off of the circuit. The embodiment is not limited to the specific type of control system, which can be but is not limited to a control chip.

[0077] The embodiment is not limited to the specific type of battery, which can include but is not limited to a lithium ion battery, a lithium metal battery, a lead-acid battery, a nickel-hydrogen battery, a lithium-sulfur battery, a lithium-air battery, a sodium-ion battery, a solid-state battery, etc.

[0078] The embodiment is not limited to the specific structure of the battery cell, which can refer to the above-mentioned embodiments of the battery cell, which will not be repeated here.

[0079] Based on the above-mentioned embodiments, the utility model includes the above-mentioned battery cell, so it also has the above-mentioned beneficial effects.

[0080] In order to make the utility model more convenient to understand, a test process of a lithium ion battery is provided below.

[0081] The positive plate 12 in the winding core 1 adopts lithium cobaltate material, the negative plate 13 adopts graphite material, and a diaphragm layer is arranged between the positive plate 12 and the negative plate 13; part of the two tab 11 of the winding core 1 is covered with an insulating sheet 15; the packaging film 2 adopts an aluminum plastic film (i.e. an aluminum layer is arranged between two insulating layers), and a lithium ion battery sample is prepared for testing.

[0082] 1. Comparative example:

[0083] The winding core 1 is prepared by using a method known in the lithium battery industry, and the aluminum plastic film web is punched and cut on a punching equipment. After the winding core 1 and the aluminum plastic film punched and cut are packaged, the electrolyte 7 is injected, and after aging, formation, second sealing and sorting, the comparative example battery sample as shown in Figure 10 is obtained.

[0084] The difference between the comparative example and the embodiment is that the aluminum plastic film does not contain the structure in the embodiment.

[0085] 2. Embodiment:

[0086] The winding core 1 is prepared by using a method known in the lithium battery industry, and the aluminum plastic film web is punched and cut on a punching equipment, and an extension 3 is reserved at the top edge. After the winding core 1 and the aluminum plastic film punched and cut are packaged, the electrolyte 7 is injected, and after aging, formation, second sealing and sorting, the reserved extension 3 is cleaned by laser, and the first insulating layer 21 on the surface of the aluminum layer is cleaned, to obtain the embodiment battery sample with the structure as shown in Figure 4 .

[0087] The laser cleaning exposes the aluminum layer, and the aluminum layer has two exposed areas.

[0088] When the battery is started to charge in a low-temperature environment, the control system receives the temperature signal of the temperature sensing element, finds that the battery temperature is low, and sends a conduction signal to the control switch, so that the control switch is turned on.

[0089] The battery charging can be synchronized with the battery heating in the embodiment, and the charging speed can be controlled by the control system to continuously adjust the charging speed with the temperature change.

[0090] 3. The three groups of comparative battery samples and the example battery samples are placed in different environmental temperatures, the control switches of the example battery samples in each group are set to different set temperatures, charging tests are performed, and the obtained test results are shown in Table 1.

[0091] Table 1: Charging test results

[0092]

[0093] The above provides a detailed introduction to the battery cell and the battery, and for those skilled in the art, the specific implementation and application range will be changed according to the idea of the embodiment of the utility model. In conclusion, the content of the specification should not be understood as a limitation of the utility model.

Claims

1. A battery cell, characterized in that, include: A core and a packaging film, wherein the packaging film encloses a receiving cavity, and the core is located within the receiving cavity; The packaging film includes a first insulating layer, an electrically heated layer, and a second insulating layer arranged sequentially along the direction close to the accommodating cavity; The electrically heated layer has at least one first exposed area on the side opposite to the accommodating cavity, the first insulating layer does not cover the first exposed area, and the first exposed area is used for electrical connection with the power supply terminal; and / or, The electric heating layer has at least one second exposed area on the side near the accommodating cavity. The second insulating layer does not cover the second exposed area, and the second exposed area is used for electrical connection with the power supply terminal.

2. The battery cell according to claim 1, characterized in that, The electric heating layer includes an exposed area disposed on the surface of the packaging film on one side of the core along its thickness direction, the exposed area including the first exposed area or the second exposed area; Alternatively, the electric heating layer includes at least two exposed areas, and at least one of the exposed areas is respectively provided on the surface of the packaging film on both sides of the core along its thickness direction, the exposed areas including the first exposed area and / or the second exposed area.

3. The battery cell according to claim 1, characterized in that, The packaging film encloses and forms a body, a top sealing edge disposed on the top of the body, and two side sealing edges disposed on opposite sides of the body; The top sealing edge and / or the side sealing edge extend in a direction away from the body to form an extension portion, and the electric heating layer in the extension portion forms a first exposed area and / or a second exposed area.

4. The battery cell according to claim 3, characterized in that, The top sealing edge includes two extensions, which at least partially overlap in their orthographic projection along the cell thickness direction; and / or, The side seal includes two extensions, which at least partially overlap in orthographic projection along the cell thickness direction.

5. The battery cell according to claim 3, characterized in that, The top sealing edge includes two extensions that do not overlap in the orthographic projection along the cell thickness direction. The core includes two tabs that extend along the top sealing edge in a direction away from the cell, with the extensions located between the two tabs; and / or, The side seal includes two extensions. In the orthographic projection of the cell thickness direction, the two extensions do not overlap. The two extensions are located on the same side seal, or the two extensions are located on two different side seals.

6. The battery cell according to claim 4, characterized in that, Both the top seal and the side seal consist of two layers of packaging film stacked together, with the two extended portions located in adjacent layers of packaging film.

7. The battery cell according to claim 1, characterized in that, The packaging film encloses and forms a body, a top sealing edge disposed on the top of the body, and two side sealing edges disposed on opposite sides of the body; The body has at least one first exposed area, the first exposed area is electrically connected to one end of the conductive connector, the other end of the conductive connector is electrically connected to the power supply end, and the packaging film further includes a third insulating layer, the third insulating layer is located on the second insulating layer and covers the first exposed area and the conductive connector.

8. The battery cell according to claim 1, characterized in that, The first insulating layer includes a nylon layer; And / or, the electric heating layer includes an aluminum layer, an aluminum alloy layer, or a stainless steel layer; And / or, the second insulating layer comprises a polypropylene layer; And / or, a first adhesive layer is provided between the first insulating layer and the electric heating layer; And / or, a second adhesive layer is provided between the second insulating layer and the electric heating layer.

9. A battery, characterized in that, include: The battery cell as described in claims 1 to 8, wherein the battery includes a power supply terminal, and the power supply terminal includes a first electrode and a second electrode connected to an external power source; The first electrode is electrically connected to the first exposed area and / or the second exposed area, and the second electrode is electrically connected to the first exposed area and / or the second exposed area.

10. The battery according to claim 9, characterized in that, Also includes: Temperature acquisition elements, switching elements, and control systems; The temperature acquisition element is electrically connected to the control system, the first exposed area and the second exposed area are electrically connected to the switching element, and the switching element is electrically connected to the control system.

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