Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and the battery pack comprises a housing which is provided with an accommodating cavity; the plurality of battery cells are arranged in the accommodating cavity, and each battery cell is provided with a first surface opposite to other battery cells and a second surface opposite to the inner side surface of the shell; the heating piece is attached to the outer side surface of the battery cell; the controller is electrically connected with the heating piece so as to control the heating piece to work; the heat insulation piece comprises a first part and a second part; the first part is at least partially arranged between the opposite first faces, and the second part is at least partially arranged between the second faces and the inner side face of the shell. When the heating element heats the battery cells, the adjacent battery cells are partially isolated through the first parts, and the battery cells and the shell are partially isolated through the second parts. Therefore, the heat of the heating piece is restrained and limited on the peripheral side of the battery cell through the heat insulation piece, so that the overall heat loss is reduced, and the heating efficiency can be further improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] The charging and discharging performance of the battery will be significantly affected in a low temperature environment. Therefore, there is currently a related technology that sets a heating module inside the battery pack to maintain the temperature inside the battery pack in a low temperature environment, provide the battery with a suitable working environment, and thereby ensure the battery's performance in a low or ultra-low temperature environment.

[0003] At present, the heat emitted by the heating module in the related technology flows disorderly in the battery pack when generating heat, and a considerable part of the heat is lost through the heat exchange between the battery pack shell and the external low-temperature environment. On the one hand, it aggravates the heat loss, consumes more energy and leads to insufficient energy saving; on the other hand, the heat work is relatively dispersed, resulting in slow heating of the battery cell and insufficient heating efficiency. Utility Model Content

[0004] The present application provides a battery pack and electrical equipment to solve the problem of insufficient heating efficiency and insufficient energy saving of the current battery pack heating module.

[0005] A battery pack, comprising:

[0006] A housing having a receiving cavity;

[0007] A plurality of battery cells are disposed in the accommodating cavity, wherein the outer surface of the battery cell has a first surface facing an adjacent battery cell and a second surface adjacent to the first surface and facing a different direction;

[0008] A heating element, disposed in the accommodating cavity, for heating the battery core;

[0009] A controller, the controller being electrically connected to the heating element to control the operation of the heating element;

[0010] Also included is a heat insulating member, the heat insulating member comprising a first portion and a second portion;

[0011] The first portion is at least partially disposed between the first surfaces of two adjacent battery cells, and the second portion is at least partially disposed between the second surface of the battery cell and the inner side surface of the housing.

[0012] To implement the above technical solution, when the heating element heats the battery cells, adjacent battery cells are partially blocked by the first part to reduce heat transfer losses to other battery cells, and the battery cells and the outer shell are partially blocked by the second part to further reduce heat transfer losses to the external environment through the outer shell. In the above, the heat of the heating element is constrained and limited to the surrounding side of the battery cell by the thermal insulation element, so that most of the heat is used to do work on the battery cell, reducing overall heat loss, thereby improving the work efficiency of heating the battery cell and improving the heating efficiency.

[0013] As one of the optional embodiments of this solution, a gap is left between the first part and the first surface, and a gap is left between the second part and the second surface.

[0014] To implement the above technical solution, the gap is conducive to the circulation of gas, and when the heating element is heating and dissipating heat, it is conducive to the circulation of heat in the gap, so that the heat can flow more evenly and comprehensively on the outer side of the battery cell, which can make the heating of the battery cell more efficient and uniform.

[0015] As one of the optional embodiments of the present scheme, the battery pack has a first direction and a second direction perpendicular to each other, and has at least two battery cells spaced apart along the first direction, the thickness direction of the battery cells is parallel to the first direction, the first surface includes main surfaces facing each other in the first direction, and the first part includes a main partition arranged between the main surfaces facing each other.

[0016] To implement the above technical solution, the battery cells are arranged along the thickness direction, and the main partition is arranged between the main surfaces facing each other in the thickness direction of the battery cells. At this time, the main surface is the surface with the largest area of ​​the battery cells. At this time, the main partition can block the main surfaces with the largest area facing each other, thereby increasing the area of ​​the first part blocking the battery cells, and further improving the heat blocking effect of the first part.

[0017] As one of the optional embodiments of the present solution, at least two of the battery cells are spaced apart along the second direction, the first surface further includes secondary surfaces facing each other in the second direction, and the first part further includes a secondary partition plate arranged between the secondary surfaces facing each other.

[0018] By implementing the above technical solution, the battery cells can also be arranged at intervals along a second direction perpendicular to the thickness direction.

[0019] As one of the optional embodiments of this solution, the first part and the second part are integrally connected to partially surround the outer side surface of the battery core.

[0020] To implement the above technical solution, the first part and the second part are integrally connected so that the thermal insulation component can more completely block the outer side of the battery cell, so that the heat generated by the heating component is more completely confined to the outer peripheral side of the battery cell, thereby further reducing heat loss and improving the heating efficiency of the heating component; on the other hand, the above setting makes the thermal insulation component an integrated design, which is easier to install.

[0021] As one of the optional embodiments of the present solution, a heat transfer hole is provided through the first part, and the heat transfer hole is provided in the middle of the first part.

[0022] To implement the above technical solution, the heat transfer holes can partially intensify the circulation of gas, so that the heat can flow more fully between the first surfaces facing each other of the battery cells, and the first surfaces facing each other of the battery cells can be heated more evenly, that is, the first part can ensure the uniform heating effect of the first surface on the basis of achieving heat blocking; and the heat of the heating element can also be transferred to other battery cells through the heat transfer holes instead of being directly lost through the outer shell of the battery pack, thereby realizing the secondary utilization of the heat of the heating element and improving the heating efficiency.

[0023] As one of the optional embodiments of this solution, the heating element includes a first heating film, and the first heating film is attached to the second surface of the battery cell facing away from the first part.

[0024] As one of the optional embodiments of the present solution, the battery pack further includes a thermal insulation layer, and the thermal insulation layer is laminated on a side of the first heating film away from the first part.

[0025] To implement the above technical solution, the heat generated by the first heating film will be dissipated toward the battery cell preferentially due to the obstruction of the thermal insulation layer, and will eventually flow to the heat transfer holes through the gaps, thereby achieving more comprehensive heat confinement and coating of the outer peripheral side of the battery cell, thereby improving the heating efficiency of the battery cell.

[0026] As one of the optional embodiments of this solution, the heating element includes a second heating film, and the second heating film is at least partially attached to the second surface.

[0027] To implement the above technical solution, the second heating film can further provide heating for the second surface, and when rapid temperature rise is required, the second heating film can be selectively activated by the controller to achieve the rapid heating function.

[0028] As one of the optional embodiments of the present solution, the insulation layer includes a main layer and a buckling part, the main layer is arranged on the side of the first heating film away from the first part, the thermal insulation component is provided with a buckling groove, and the buckling part is buckled in the buckling groove.

[0029] As one of the optional embodiments of this solution, it also includes a controller, which is electrically connected to the heating element to control the operation of the heating element.

[0030] As one of the optional embodiments of the present solution, it also includes a temperature sensor for detecting the temperature of the battery core, and the temperature sensor is electrically connected to the controller.

[0031] On the other hand, an electrical device is also provided, which includes the battery pack as described above.

[0032] One of the above technical solutions has the following advantages or beneficial effects:

[0033] 1. When the heating element heats the battery cell, the adjacent battery cells are partially blocked by the first part to reduce the heat transfer loss to other battery cells, and the battery cell and the shell are partially blocked by the second part to further reduce the heat transfer loss to the external environment through the shell. In the above, the heat of the heating element is constrained and limited to the surrounding side of the battery cell by the heat insulation element, so that most of the heat is used to do work on the battery cell, reducing the overall heat loss, thereby improving the work efficiency of heating the battery cell and improving the heating efficiency;

[0034] 2. By means of the heat transfer hole, the heating element is arranged on the side of the battery cell away from the heat transfer hole, and the insulation layer is arranged on the side of the battery cell away from the heat transfer hole, the heat transfer hole can partially intensify the circulation of gas, so that the heat can flow more fully between the first facing surfaces of the battery cell, and the first facing surfaces of the battery cell can be heated more evenly, that is, the first part can ensure the uniform heating effect of the first surface on the basis of achieving heat isolation; and the heat of the heating element can also be transferred to other battery cells through the heat transfer hole instead of being directly lost through the outer shell of the battery pack, thereby realizing the secondary utilization of the heat of the heating element and improving the heating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0036] Figure 1 is an overall structural diagram of the battery pack provided in Example 1 of the present application;

[0037] Figure 2 is an overall exploded structural diagram of the battery pack provided in Example 1 of the present application;

[0038] Figure 3 It is a schematic diagram provided in Example 1 of the present application mainly used to indicate the position of the battery cell;

[0039] Figure 4 It is an exploded structural diagram provided in Example 1 of the present application and mainly used to show the structure of an electronic circuit board;

[0040] Figure 5 It is a cross-sectional view provided in Example 1 of the present application mainly used to show the structure of the battery core and the thermal insulation member;

[0041] Figure 6 This is provided in Example 1 of the present application Figure 5 A partial enlarged view of part A;

[0042] Figure 7 This is provided in Example 1 of the present application Figure 5 A partial enlarged view of part B;

[0043] Figure 8 It is a cross-sectional view provided in Example 1 of the present application mainly for showing the structure of the thermal insulation member;

[0044] Fig. 9 It is a cross-sectional view provided in Example 1 of the present application, which is mainly used to display the heating film, the thermal insulation layer and the heat transfer hole structure.

[0045] Reference numerals: 1, housing; 1a, mounting opening;

[0046] 2. battery cell; 21. first surface; 211. main surface; 212. secondary surface; 22. second surface;

[0047] 3. Heating element; 31. First heating film; 312. Second heating film;

[0048] 4. Controller; 41. Electronic circuit board; 42. Packaging board;

[0049] 5. heat insulating member; 5a. buckling groove; 51. first part; 511. main partition; 512. auxiliary partition; 51a. heat transfer hole; 52. second part;

[0050] 6. Clearance;

[0051] 7. Insulation layer; 71. Main body layer; 72. Fastening part;

[0052] 8. Temperature sensor;

[0053] 9. Middle plate;

[0054] Z, first direction; X, second direction. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0057] The following is combined with Figure 1-9 Provide a detailed, clear and complete description of this application.

[0058] Reference Figure 1 and Figure 2 , this embodiment discloses a battery pack, which includes a shell 1, the shell 1 is rectangular and has a accommodating cavity inside. The battery pack has a first direction Z and a second direction X that intersect each other. In this embodiment, the first direction Z and the second direction X are perpendicular to each other. A battery cell 2, a heat insulating member 5, a heating member 3, a controller 4 and a thermal insulation layer 7 are arranged in the accommodating cavity. Among them, there are multiple battery cells 2, at least two battery cells 2 are arranged at intervals along the first direction Z and at least two battery cells 2 are arranged at intervals along the second direction X, and the thickness direction of each battery cell 2 is parallel to the first direction Z.

[0059] Reference Figure 2 and Figure 3 Specifically, in this embodiment, four battery cells 2 are provided, and the four battery cells 2 are arranged in two groups along the first direction Z at intervals, each group of battery cells 2 has two individual battery cells 2, and the individual battery cells 2 in each group of battery cells 2 are arranged at intervals along the second direction X. The battery cell 2 is defined to have a first surface 21 facing other battery cells 2 and a second surface 22 facing the inner side surface of the housing 1, and for a clearer division, the first surface 21 includes a main surface 211 facing the battery cell 2 in the first direction Z and a secondary surface 212 facing the battery cell 2 in the second direction X. The heating element 3 is attached and fixed to the outer side surface of the battery cell 2 to heat the battery cell 2. The controller 4 is electrically connected to the heating element 3 to control the start and stop of the heating element 3 and the size of the heating power.

[0060] It should be noted that the heating element 3 in this embodiment is a heating film, or a heating film, an electric heating film, which is generally a planar heating element composed of an electrical insulating material and a heating resistor material encapsulated in the electrical insulating material. It is a film that can generate heat after being energized. Specifically, it can include a conductive special ink, a metal current-carrying strip, and is processed and hot-pressed between insulating polyester films. When working, the heating film is used as the heating body to send heat into the space in the form of radiation.

[0061] It should be noted that, in this embodiment, the heating element 3 is arranged on the bottom surface of the two battery cells 2 that are located at the bottom in the first direction Z. In other optional embodiments, the heating element 3 can be selectively arranged on any side surface of any battery cell 2. At the same time, the heating element 3 can also be an integral structure, that is, part of the heating element 3 covers one of the battery cells 2, and the other part covers the surface of the other battery cells 2.

[0062] It should be noted that the purpose of the thermal insulation member 5 in this embodiment is to reduce heat loss, so it is preferred to set the thermal conductivity of the thermal insulation member 5 lower than the thermal conductivity of the housing 1, which can better restrict heat loss.

[0063] In some optional embodiments, the battery pack further includes a temperature sensor 8 for detecting the temperature of the battery cell 2, for example Figure 4 and Figure 8 As shown in the figure, a plurality of temperature sensors 8 are provided, which can accurately test the temperature corresponding to each battery cell 2. The temperature sensor 8 is provided in the middle of the battery cell 2, and the temperature sensor 8 is electrically connected to the controller 4. The controller 4 receives the electrical signal transmitted by the temperature sensor 8 so as to accurately determine the specific temperature of each battery cell 2, so as to flexibly control different heating elements 3 to heat or stop working according to the demand.

[0064] Reference Figure 2 and Figure 4 , an electronic circuit board 41 is provided at the middle position of the thermal insulation 5 in the second direction X, the controller 4 is integrated on the electronic circuit board 41, and the electronic circuit board 41 is also integrated with a connection surface electrically connected to the pole ear of the battery cell 2 to achieve current conduction. A packaging board 42 is also provided on the side of the electronic circuit board 41 away from the thermal insulation 5, and the packaging board 42 is fixed on the thermal insulation 5 and covers the electronic circuit board 41 to protect the electronic circuit board 41. It should be noted that the electronic circuit board 41 and the packaging board 42 are fixed by snap-fit ​​fixation in this embodiment, and other fixing methods such as adhesive fixation or welding fixation may also be used in some optional embodiments. An installation opening 1a is opened on the housing 1 to expose the electronic circuit board 41 for easy connection with the outside world.

[0065] Reference Figure 5-Figure 8 Regarding the heat insulating member 5, firstly, the heat insulating member 5 is an integrated structure for easy installation and processing. Specifically, the heat insulating member 5 includes a first portion 51 and a second portion 52, the first portion 51 is at least partially disposed between the first surfaces 21 facing each other, and the second portion 52 is at least partially disposed between the second surface 22 and the inner side surface of the housing 1. And there is a gap 6 between the first portion 51 and the first surface 21 and between the second portion 52 and the second surface 22.

[0066] As described above, when the heating element 3 heats the battery cell 2, the adjacent battery cells 2 are partially blocked by the first part 51 to reduce the heat transfer loss to other battery cells 2, and the battery cell 2 and the shell 1 are partially blocked by the second part 52 to further reduce the heat transfer loss to the external environment through the shell 1, so that the heat of the heating element 3 is constrained and limited to the surrounding side of the battery cell 2 through the heat insulating element 5, so that most of the heat is used to do work on the battery cell 2, reducing the overall heat loss, thereby improving the work efficiency of heating the battery cell 2 and improving the heating efficiency. The gap 6 is conducive to the circulation of gas, and when the heating element 3 heats and dissipates heat, it is conducive to the circulation of heat in the gap 6, so that the heat can more evenly and comprehensively flow on the outer side of the battery cell 2, which can make the heating of the battery cell 2 more efficient and uniform.

[0067] Reference Figure 5-Figure 8 Specifically, the first part 51 includes a main partition 511 disposed between the main surfaces 211 facing each other and a secondary partition 512 disposed between the secondary surfaces 212 facing each other, and the second part 52 is also configured in a plate shape. Two main partitions 511 are provided, which are respectively disposed between the main surfaces 211 facing each other of the two battery cells 2 spaced apart in the first direction Z. The facing surfaces of the two main partitions 511 are integrally extended downward along the first direction Z to form the above-mentioned secondary partition 512. An intermediate plate 9 is fixedly provided between the two secondary partitions 512. The ends of the two main partitions 511 that are separated from each other are integrally extended along the upper and lower positions of the first direction Z to form the second part 52. The two sides of the two main partitions 511 along the second direction X are also integrally extended along the upper and lower positions of the first direction Z to form the second part 52. The above setting enables the first step and the second part 52 located on the peripheral side of the same battery cell 2 to form a structure similar to a barrier cover, and the cover is arranged on the outer peripheral side of a single battery cell 2, so that the thermal insulation component 5 can more comprehensively block the outer side of the battery cell 2 so that the heat of the heating component 3 is more comprehensively confined to the outer peripheral side of the battery cell 2, further reducing heat loss, and ultimately effectively improving the heating efficiency of the heating component 3.

[0068] It should be noted that in some optional embodiments, the first part 51 and the second part 52 may also be a split structure. Although the connection position of the first part 51 and the second part 52 cannot fully block the heat, the single first part 51 or the second part 52 can be separated, which can be easily disassembled and maintained.

[0069] Reference Figure 8 and Fig. 9 The first part 51 is provided with a heat transfer hole 51a, which is located in the middle of the first part 51. The heat transfer hole 51a can partially enhance the flow of gas, for example Fig. 9As shown in the figure, heat can flow more fully between the first surfaces 21 facing each other of the battery cells 2, so that the first surfaces 21 facing each other of the battery cells 2 can be heated more evenly, that is, the first portion 51 can ensure the uniform heating effect of the first surface 21 on the basis of achieving heat isolation; and the heat of the heating element 3 can also be transferred to other battery cells 2 through the heat transfer holes 51a instead of being directly lost through the outer shell 1 of the battery pack, thereby realizing the secondary utilization of the heat of the heating element 3 and improving the heating efficiency.

[0070] It should be noted that, specifically in this embodiment, the heat transfer hole 51a is opened on the main partition 511, so in this embodiment, the main surface 211 of the battery cell 2 corresponding to the main partition 511 can be heated more evenly. Similarly, if the heat transfer hole 51a is opened on the auxiliary partition 512, the auxiliary surface 212 of the battery cell 2 corresponding to the auxiliary partition 512 can be heated more evenly.

[0071] Reference Figure 4 and Fig. 9 The heating element 3 includes a first heating film 31, which is attached to the second surface 22 of the battery cell 2 away from the first portion 51. The battery pack also includes a thermal insulation layer 7, which is attached to the side of the first heating film 31 away from the first portion 51. This setting makes the heat heated by the first heating film 31 be preferentially dissipated toward the battery cell 2 due to the obstruction of the thermal insulation layer 7, and finally flow to the heat transfer hole 51a through the gap 6, thereby achieving a more comprehensive heat restraint and coating of the outer peripheral side of the battery cell 2, so as to improve the heating efficiency of the battery cell 2.

[0072] In some embodiments, the heating element 3 further includes a second heating film 312, and the second heating film 312 is at least partially attached to the second surface 22. In this embodiment, the second heating film 312 is arranged in the gap 6 formed by the two end surfaces of the battery core 2 in the second direction X and the inner side surface of the housing 1. The second heating film 312 can further provide heating for the second surface 22. When rapid heating is required, the second heating film 312 can be selectively activated by the controller 4 to achieve the function of rapid heating.

[0073] It should be noted that the second heating film 312 is Fig. 9 It is shown as being integrally connected with the first heating film 31 , but in fact the first heating film 31 and the second heating film 312 should be independent of each other and can be independently heated by the controller 4 , so that the controller 4 can control the heating process of the battery cell 2 more flexibly.

[0074] It should be noted that in this embodiment, the heating element 3 is only arranged for the two battery cells 2 located at the bottom in the first direction Z. It is not excluded that in other optional embodiments, each battery cell 2 is provided with a corresponding heating element 3. Similarly, the thermal insulation layer 7 can also be provided for each battery cell 2. As long as the thermal insulation layer 7 is located on the side of the heating film away from the battery cell 2, it can block the heat from dissipating toward the battery cell 2 during heating, and the battery cell 2 can be heated in a targeted manner to improve the heating efficiency. At the same time, the controller 4 can also flexibly select the heating elements 3 at different positions to work or stop working according to the temperature state of different battery cells 2.

[0075] Back to Figure 4 The thermal insulation layer 7 includes a thin plate-shaped main body layer 71 and a buckling portion 72. The main body layer 71 is arranged on the side of the first heating film 31 away from the first portion 51. The main body layer 71 is made of thermal insulation cotton or other materials with good thermal insulation effect. The buckling portion 72 is arranged on both sides of the main body layer 71 along the second direction X. The thermal insulation component 5 is provided with a buckling groove 5a, and the buckling portion 72 is buckled in the buckling groove 5a.

[0076] The above description is only a partial implementation method of the embodiments of the present application and does not constitute any form of limitation on the application. The protection scope of the embodiments of the present application is not limited thereto. Any simple modifications, equivalent changes and modifications that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present application should be covered within the protection scope of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A housing (1) having a receiving cavity; A plurality of battery cells (2) are arranged in the accommodating cavity, wherein the outer surface of the battery cell (2) comprises a first surface (21) facing an adjacent battery cell (2) and a second surface (22) adjacent to the first surface (21) and facing a different direction; A heating element (3) is arranged in the accommodating cavity and is used to heat the battery core (2); Also included is a heat insulating member (5), wherein the heat insulating member (5) includes a first portion (51) and a second portion (52); The first portion (51) is at least partially disposed between the first surfaces (21) of two adjacent battery cells (2), and the second portion (52) is at least partially disposed between the second surface (22) of the battery cell (2) and the inner side surface of the housing (1).

2. The battery pack according to claim 1, characterized in that: A gap (6) is left between the first portion (51) and the first surface (21), and between the second portion (52) and the second surface (22).

3. The battery pack according to claim 1 or 2, characterized in that: The battery pack has a first direction (Z) and a second direction (X) that are perpendicular to each other, at least two battery cells (2) are arranged at intervals along the first direction (Z), the thickness direction of the battery cells (2) is parallel to the first direction (Z), the first surface (21) includes main surfaces (211) facing each other in the first direction (Z), and the first part (51) includes a main partition (511) arranged between the main surfaces (211) facing each other.

4. The battery pack according to claim 3, characterized in that: At least two of the battery cells (2) are arranged at intervals along the second direction (X); the first surface (21) also includes secondary surfaces (212) facing each other in the second direction (X); and the first part (51) also includes a secondary partition (512) arranged between the secondary surfaces (212) facing each other.

5. The battery pack according to claim 4, characterized in that: The first part (51) and the second part (52) are integrally connected to partially surround the outer side surface of the battery core (2).

6. The battery pack according to claim 1, wherein: A heat transfer hole (51a) is provided through the first part (51), and the heat transfer hole (51a) is provided in the middle of the first part (51).

7. The battery pack according to claim 6, characterized in that: The heating element (3) comprises a first heating film (31), wherein the first heating film (31) is attached to a second surface (22) of the battery core (2) facing away from the first portion (51).

8. The battery pack according to claim 7, characterized in that: The battery pack further comprises a heat-insulating layer (7), wherein the heat-insulating layer (7) is arranged in close contact with a side of the first heating film (31) facing away from the first part (51).

9. The battery pack according to claim 8, characterized in that: The heating element (3) comprises a second heating film (312), and the second heating film (312) is at least partially attached to the second surface (22).

10. The battery pack according to claim 8, characterized in that: The thermal insulation layer (7) comprises a main body layer (71) and a buckling portion (72); the main body layer (71) is arranged in close contact with the side of the first heating film (31) facing away from the first portion (51); a buckling groove (5a) is provided on the thermal insulation component (5); and the buckling portion (72) is buckled into the buckling groove (5a).

11. The battery pack according to claim 1, wherein: It also comprises a controller (4), wherein the controller (4) is electrically connected to the heating element (3) to control the operation of the heating element (3).

12. The battery pack according to claim 11, characterized in that: It also includes a temperature sensor (8) for detecting the temperature of the battery core (2), and the temperature sensor (8) is electrically connected to the controller (4).

13. An electrical equipment, characterized in that: include: A battery pack as claimed in any one of claims 1 to 12.

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