CN213071212U

CN213071212U - Battery pack and mobile terminal

Info

Publication number: CN213071212U
Application number: CN202021646534.9U
Authority: CN
Inventors: 张金龙; 陈仁杰; 郑洪彬
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-04-27
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a battery component, which comprises a battery body, wherein a battery head is arranged at the end part of the battery body; a battery protection plate stacked on the first surface of the battery head and electrically connected to the battery body; a first battery heat dissipation layer stacked on the first surface of the battery protection plate; and a battery heat conduction layer which is laminated on a second surface of the battery head part opposite to the first surface. The utility model discloses a battery pack is through setting up the multilayer structure including first battery heat-conducting layer, battery protection shield, battery heat dissipation layer at the battery head, can effectively reduce the accumulation of calorific capacity in battery pack that charges, reduces the temperature rise of charging, prolongs the heavy current charge time, shortens the charge time of whole charging process, promotes user experience.

Description

Battery pack and mobile terminal

Technical Field

The utility model relates to a battery technology field especially relates to battery pack and mobile terminal.

Background

With the charging power of mobile terminals such as mobile phones and tablet computers becoming larger and larger, the problem of battery charging and heating in the mobile terminals also becomes more and more serious.

In the related art, when the temperature of a mobile terminal such as a mobile phone or a tablet computer rises to a certain temperature due to the charging heat value of a battery, the charging temperature rise is limited by limiting the charging speed of the mobile terminal, so as to prevent the temperature from being too high. However, limiting the charging speed results in extended charging time, which affects the user experience.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists among the correlation technique, the utility model provides a battery pack and mobile terminal.

According to a first aspect of embodiments of the present invention, there is provided a battery assembly, including a battery body, a battery head provided at an end of the battery body; a battery protection plate stacked on the first surface of the battery head and electrically connected to the battery body; a first battery heat dissipation layer stacked on the first surface of the battery protection plate; and a battery heat conduction layer which is laminated on a second surface of the battery head part opposite to the first surface.

The utility model discloses an in the embodiment, battery pack still includes the battery insulating layer, and the range upon range of setting of battery insulating layer is on first battery heat dissipation layer.

In one embodiment of the present invention, an electronic device is disposed on the first surface of the battery protection board; an electronic device is provided on a second surface of the battery protection plate opposite to the first surface.

In an embodiment of the present invention, a second battery heat dissipation layer is stacked on a second surface of the battery protection plate opposite to the first surface.

In one embodiment of the present invention, the first battery heat dissipation layer is a layer formed of a phase change material.

In an embodiment of the present invention, the battery heat-conducting layer is a graphene heat-conducting material layer.

In an embodiment of the present invention, the battery thermal insulation layer is a thermal insulation foam layer.

In one embodiment of the present invention, a distance between the outer surface of the battery heat insulating layer and the second surface of the battery head is equal to or less than the thickness of the battery body.

In an embodiment of the present invention, the battery heat conduction layer further extends and is disposed on the battery body.

In an embodiment of the present invention, the battery module further includes a flexible circuit board, and the flexible circuit board is electrically connected to the battery protection board; a portion of the flexible circuit board is stacked on the first battery heat sink layer.

According to a second aspect of the embodiments of the present invention, there is provided a mobile terminal, comprising the battery module of any one of the above embodiments; the battery assembly comprises a first battery heat dissipation layer and a battery thermal insulation layer; the battery heat conduction layer of the battery component is attached to the middle frame; and the first battery heat dissipation layer or the battery heat insulation layer of the battery component is attached to the shell.

The embodiment of the utility model provides a technical scheme can include following beneficial effect:

through set up the multilayer structure including first battery heat-conducting layer, battery protection shield, battery heat dissipation layer at the battery head, can effectively reduce the accumulation of calorific capacity in battery pack that charges, reduce the temperature rise of charging, prolong heavy current charge time, shorten the charge time of whole charging process, promote user experience.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram illustrating a battery assembly according to an exemplary embodiment.

Fig. 2 is an exploded view of a battery assembly shown in accordance with an exemplary embodiment.

Fig. 3A is a schematic front view of a battery protection plate and a flexible circuit board of a battery assembly shown in accordance with an exemplary embodiment.

Fig. 3B is a schematic reverse side view of a battery protection plate and a flexible circuit board of a battery assembly shown in accordance with an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

With the charging power of mobile terminals such as mobile phones and tablet computers becoming larger and larger, the problem of battery charging and heating in the mobile terminals also becomes more and more serious. Particularly, the battery head portion generates more heat during charging than other portions of the battery. Moreover, because the space in the mobile terminal is limited, the battery in the mobile terminal often has no heat dissipation measures, and the heat generated by charging cannot be dissipated in time. When the charging heat value of the battery causes the terminal to reach a certain temperature, for example, 39 ℃, the charging safety is ensured by limiting the charging speed. However, limiting the charging speed will result in a longer charging time, which affects the user experience, and therefore it is imperative to reduce the temperature rise of the battery.

A battery in a mobile terminal such as a mobile phone or a tablet computer generally includes a battery body and a battery protection plate fixed to one end of the battery body. The battery protection board is an Integrated Circuit board, and includes a control Integrated Circuit (IC), a Metal Oxide Semiconductor Field Effect Transistor (MOS Transistor), a precision resistor, and the like, and is used to provide overcharge protection, overdischarge protection, overcurrent protection, and short Circuit protection for the battery. Because the battery protection board comprises heating devices such as an MOS tube and a precision resistor, the battery protection board can generate heat in the charging process of the battery, and the heat productivity of the whole battery is increased.

Moreover, the surface of the battery protection plate is generally adhered with gummed paper to protect the battery protection plate. However, the adhesion of the adhesive tape may affect the heat dissipation of the battery protection board, further increasing the heat generation of the whole battery. Resulting in further extended charging time, affecting user experience.

In order to solve the battery among the correlation technique especially battery head charge calorific capacity big, the time of charging extension influences user experience's problem, the embodiment of the utility model provides a battery pack.

Fig. 1 is a schematic diagram illustrating a battery assembly according to an exemplary embodiment. Fig. 2 is an exploded view of a battery assembly shown in accordance with an exemplary embodiment. Fig. 3A is a schematic front view of a battery protection plate and a flexible circuit board of a battery assembly shown in accordance with an exemplary embodiment. Fig. 3B is a schematic reverse side view of a battery protection plate and a flexible circuit board of a battery assembly shown in accordance with an exemplary embodiment.

As shown in fig. 1 and 2, the battery assembly 100 includes a battery body 10, a battery protection plate 20, a first battery heat dissipation layer 30, and a battery heat conduction layer 40.

The battery body 10 is an energy storage unit in the battery assembly 100, such as a conventional lithium ion battery, and is manufactured by processes of lamination, winding, sealing, welding, formation, and the like. In the embodiment of the present invention, the battery body 10 is a flat battery to adapt to mobile terminals such as mobile phones and computers. However, the present invention is not limited thereto, and the battery body 10 may also have other shapes, such as a rectangular parallelepiped with a large thickness, a cylindrical shape, etc., according to the application thereof.

The battery body 10 inevitably has internal resistance due to its material and structural characteristics, and generates heat itself during charge and discharge. Especially, when the high charging power is adopted for rapid charging, since the charging current is increased, the self heat productivity of the battery body 10 is correspondingly increased, if the heat is not timely dissipated, the heat is gradually accumulated, the charging temperature rise is caused to rise, the charging rate is influenced, the charging time is prolonged, and the user experience is influenced.

The battery head 11 is provided at an end of the battery body 10, and the battery head 11 includes a first surface 111 and a second surface 112, and the first surface 111 and the second surface 112 are two opposite surfaces of the battery head 11. The battery head 11 is electrically connected to output terminals (not shown) of both the positive electrode and the negative electrode.

As shown in fig. 1 and 2, the battery protection plate 20 is stacked on the first surface 111 of the battery head 11 and is electrically connected to the two electrode output terminals of the battery body 10. The battery protection plate 20 is approximately rectangular, and has a length equal to or less than the width of the battery body 10. The long side of the battery protection plate 20 is bonded to the first surface 111 of the battery header 11 along the width direction of the battery body 10 by bonding, welding, or the like. One region of the battery protection plate 20 is closely attached to the first surface 111 of the battery header 11, and the other region protrudes outward from the first surface 111 of the battery header 11 and is in a suspended state.

However, the present invention is not limited thereto, and the shape of the battery protection plate 20 may be other shapes such as a square, a circle, etc. according to the shape of the battery body 10 and the fixing position. The battery protection plate 20 may also be fixed at other positions of the battery body 10, for example, at other surfaces of the battery head 11.

In one embodiment, as shown in fig. 3A and 3B, the battery protection plate 20 includes a first face 21 and a second face 22. An electronic component is provided on a first surface 21 of the battery protection plate 20, and an electronic component is provided on a second surface of the battery protection plate 20 opposite to the first surface 21. Through setting up electron device at the first face 21 and the second face 22 of battery protection shield 20, can disperse the electron device that generates heat such as precision resistor, MOS pipe, increase the interval between the electron device, make generating heat of battery protection shield more even, avoid the heat gathering, can not appear special high temperature point, extension heavy current charge time.

As shown in fig. 1 and 2, the first battery heat dissipation layer 30 is stacked on the first surface 21 of the battery protection plate 20. The first battery heat dissipation layer 30 may have a rectangular shape with a length not greater than the length of the battery protection plate 20 and a width not greater than the width of the battery protection plate 20. The first battery heat dissipation layer 30 may have a size similar to that of the battery protection plate 20, covering the entire first face 21 of the battery protection plate 20.

However, the present invention is not limited thereto, and the first battery heat dissipation layer 30 may also have other shapes, such as a square, a circle, and the like. The size of the first battery heat dissipation layer 30 may be determined according to the actual use of the battery assembly 100. In order to save material and cost, the first battery heat dissipation layer 30 may include a plurality of discrete first battery heat dissipation layers 30, the discrete first battery heat dissipation layers 30 being stacked on the surface of the heat generating electronic device disposed on the first side 21 of the battery protection plate 20.

The first battery heat dissipation layer 30 may employ a phase change material, i.e., the first battery heat dissipation layer 30 is a layer formed of a phase change material. When the temperature of the battery assembly 100 reaches the enthalpy value of the phase change material, the phase change material absorbs heat in the battery assembly 100, reduces the accumulation of heat in the battery assembly 100, reduces the charging temperature rise, and thus prolongs the large-current charging time. When the temperature of the battery assembly 100 is reduced to a certain degree, the phase change material releases heat. When the temperature of the battery assembly 100 reaches the enthalpy value of the phase change material again, the phase change material absorbs heat again, and the cycle is repeated.

However, the present invention is not limited thereto, and other materials, such as graphite fins, metal fins, heat pipe heat dissipation layers, etc., can be used for the first battery heat dissipation layer 30 in addition to the phase change material.

In an embodiment, the first battery heat dissipation layer 30 may be disposed on the first face 21 of the battery protection plate 20 by double-sided adhesive tape lamination. However, the present invention is not limited thereto, and the first battery heat dissipation layer 30 may be disposed on the first surface 21 of the battery protection plate 20 by dispensing, hot pressing, or the like.

The embodiment of the utility model provides an in, range upon range of setting on the battery protection board 20 of battery head 11 of first battery heat dissipation layer 30, the heat that produces in battery body 10 and the battery protection board 20 distributes away through first battery heat dissipation layer 30, reduces the accumulation of calorific capacity in battery pack 100, reduces the temperature rise of charging to prolong heavy current charge time, promote user experience. In addition, the first battery heat dissipation layer 30 is disposed on the battery header 11 having a higher heat generation amount without covering the entire upper surface 12 of the battery body 10, ensuring effective heat dissipation in a limited space, and ensuring a high energy density of the battery assembly 100.

In one embodiment, a second battery heat dissipation layer (not shown) is stacked on a second surface 22 of the battery protection plate 20 opposite to the first surface 21. The size of the second battery heat dissipation layer may be determined according to the actual use of the battery assembly 100. The second battery heat dissipation layer can be rectangular, square, circular, and the like. The second battery heat dissipation layer may be an integral layer structure covering the second surface 22 of the battery protection board 20, or a plurality of discrete second battery heat dissipation layers covering the surface of the heat generating electronic device on the second surface 22 of the battery protection board 20.

The second battery heat dissipation layer can be a phase-change heat absorption material layer, a graphite heat dissipation sheet, a metal heat dissipation sheet, a heat pipe heat dissipation layer and other layered structures. The second battery heat dissipation layer may be stacked on the second surface 22 of the battery protection board 20 by means of double-sided tape, dispensing, hot pressing, or the like.

In this embodiment, the second battery heat dissipation layer is stacked on the second surface 22 of the battery protection plate 20, so as to be beneficial to the dissipation of heat generated by the battery protection plate 20, further reduce the accumulation of heat generated by the battery assembly 100, and reduce the charging temperature rise, thereby prolonging the large-current charging time and improving the user experience.

As shown in fig. 1 and 2, the battery thermally conductive layer 40 is stacked on a second surface 112 of the battery header 11 opposite the first surface 111. The battery thermally conductive layer 40 may be rectangular, having a length greater than the width of the battery header 11 and a width greater than the width of the second side 112 of the battery header 11. The battery heat conduction layer 40 protrudes outward from the battery header 11 along both the length direction and the width direction of the battery header 11.

However, the present invention is not limited thereto, and the battery heat conduction layer 40 may also have other shapes, such as square, circular, and the like. The size of the battery heat conductive layer 40 may be determined by the actual use of the battery.

In an embodiment, the battery thermally conductive layer 40 may be further extended and disposed on the battery body 10 when there is no particular requirement on the energy density of the battery assembly 100. The battery heat conduction layer 40 extends to the battery body 10 and can cover the whole lower surface 13 of the battery body 10, and the heat generation amount in the battery assembly 100 can be better conducted out through the direct contact of the battery heat conduction layer 40 and the whole lower surface 13 of the battery body 10.

The battery heat conduction layer 40 can adopt graphite heat conduction material, and the battery heat conduction layer 40 is the graphite alkene heat conduction layer promptly. The heat conduction layer 40 of the battery conducts the charging heat out, for example, to a middle frame of a mobile terminal such as a mobile phone and a tablet computer, where the middle frame is usually made of a metal material, which is beneficial to heat conduction. Therefore, accumulation of charge heat generation in the battery assembly 100 is reduced by the battery thermally conductive layer 40.

However, the present invention is not limited thereto, and besides the graphite heat conducting material, the battery heat conducting layer 40 may also be made of other materials, such as metal material with high heat conductivity, heat conducting silica gel, etc.

In one embodiment, the battery thermally conductive layer 40 may be disposed on the second side 112 of the battery header 11 by a double-sided adhesive tape lamination. However, the present invention is not limited thereto, and the battery heat conduction layer 40 may also be disposed on the second surface 112 of the battery head 11 by means of dispensing, hot pressing, and the like.

The embodiment of the utility model provides an in, the range upon range of setting of battery heat-conducting layer 40 is on the second face 112 of battery head 11, and the heat in battery pack 100 conducts away through battery heat-conducting layer 40, reduces the accumulation of calorific capacity in battery pack 100 that charges, reduces the temperature rise of charging to prolong heavy current charge time, promote user experience.

In one embodiment, the battery assembly 100 further includes a battery thermal insulation layer 50, the battery thermal insulation layer 50 being disposed on top of the first battery heat dissipation layer 30. The battery thermal insulating layer 50 may have a layered structure having the same shape and size as the first battery heat dissipation layer 30. However, the present invention is not limited thereto, and the battery thermal insulation layer 50 may have other shapes and sizes, such as square, circular, etc., according to the actual use of the battery assembly 100.

The battery heat insulation layer 50 may be made of heat insulation foam, that is, the battery heat insulation layer 50 is a heat insulation foam layer. The heat insulation foam is used for preventing the heat of the battery assembly 100 from being conducted to the rear cover of the mobile terminal such as a mobile phone and a tablet personal computer, and the temperature of the rear cover of the mobile terminal is prevented from rising. However, the present invention is not limited thereto, and other materials, such as glass fiber, asbestos, aerogel felt, etc., may be used for the battery insulation layer 50 in addition to the insulation foam.

In one embodiment, the battery insulating layer 50 may be disposed on the first battery heat dissipation layer 30 by double-sided adhesive tape lamination. However, the present invention is not limited thereto, and the battery thermal insulation layer 50 may be disposed on the first battery heat dissipation layer 30 by dispensing, hot pressing, or the like.

The embodiment of the utility model provides an in, the range upon range of setting of battery insulating layer 50 is on first battery heat dissipation layer 30, prevents battery pack 100's heat conduction to mobile terminal's such as cell-phone, panel computer back lid, prevents that the temperature of mobile terminal's back lid from rising to heat current limiting temperature (temperature 39 ℃ usually), thereby prevent the reduction charging current that the heat current limiting and lead to, prolong heavy current charge time, promote user experience.

In one embodiment, the first surface 111 of the battery head 11 is lower than the upper surface 12 of the battery body 10, and the second surface 112 of the battery body 10 is lower than the lower surface 13 of the battery body 10. The distance between the outer surface of the battery thermal insulation layer 50 (the surface away from the first battery heat dissipation layer 30) and the second face 112 of the battery header 11 is equal to or less than the thickness of the battery body 10. On one hand, the occupied space of the battery pack 100 in mobile terminals such as mobile phones and tablet computers can be reduced, and on the other hand, the energy density of the battery pack 100 is ensured.

The flexible circuit board is a printed circuit board which is made of polyimide or polyester film as a base material and has high reliability and excellent flexibility. The flexible cable can be freely bent, wound and folded, can be randomly arranged according to the space layout requirement, can be randomly moved and stretched in a three-dimensional space, and can bear millions of dynamic bending without damaging a lead. The integration of component assembly and wire connection can be realized, the volume and the weight of electronic products can be greatly reduced, and the method is suitable for the requirements of the electronic products on the development towards high density, miniaturization and high reliability.

As shown in fig. 1 to 3B, in an embodiment, the battery assembly 100 further includes a flexible circuit board 60, and the flexible circuit board 60 is electrically connected to the battery protection plate 20; a portion of the flexible circuit board 60 is stacked on the first battery heat dissipation layer 30.

The flexible circuit board 60 includes a land 61, a bent region 62, a fixing region 63, a connection region 64, and an electrical connector 65. The flexible circuit board 60 is led out from the side of the battery protection board 20. The welding area 61 is welded to the pad of the second face 22 of the battery protection board 20. The bending region 62 is folded from the second face 22 of the battery protection board 20 to the first face 21 of the battery protection board 20 through the side face of the battery protection board 20, and has a "U" shape. The connection region 64 protrudes outward from the battery protection plate 20, and is provided with an electrical connector 65. The electric connector 65 is used for being connected with a motherboard of a mobile terminal such as a mobile phone and a tablet computer in a pluggable manner.

The fixing region 63 and the connecting region 64 have an "L" shaped configuration. The fixing region 63 is stacked on the surface of the first battery heat dissipation layer 30. In the charging and discharging processes of the battery assembly 100, the heat generated by the current flowing through the flexible circuit board 60 may be dissipated through the first battery heat dissipation layer 30, thereby reducing the overall heat generated by the battery assembly 100. Further, the battery thermal insulation layer 50 can also prevent the heat generated by the flexible circuit board 60 from being conducted to the rear cover of the mobile terminal such as a mobile phone and a tablet computer, so that the charging current is prevented from decreasing due to the temperature rise of the rear cover, the large-current charging time is prolonged, and the user experience is improved.

According to a second aspect of the embodiments of the present invention, there is provided a mobile terminal (not shown) including the battery assembly 100, the middle frame 200, and the housing (not shown) as described above. The mobile terminal can be a mobile phone, a tablet computer, an e-reader, a multimedia player, a wearable device, and the like.

The battery heat conductive layer 40 of the battery assembly 100 is attached to the middle frame 200. Through direct contact, battery heat-conducting layer 40 can be with battery pack 100's heat conduction to center 200, reduces the heat in battery pack 100's accumulation, reduces the temperature rise of charging, prolongs the heavy current charge time, promotes user experience.

The first battery heat dissipation layer 30 or the battery thermal insulation layer 50 of the battery assembly 100 is attached to the case. When casing and the laminating of battery insulating layer 50 are in the same place, battery insulating layer 50 prevents the heat conduction of battery pack 100 to mobile terminal's back lid, prevents that mobile terminal's back lid's temperature from rising to heat current limiting temperature to prevent the reduction charging current that heat current limiting and lead to, extension heavy current charge time promotes user experience.

It is understood that the term "plurality" in the present invention means two or more, and other terms are similar. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information, without departing from the scope of the present invention.

It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present embodiment and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery assembly, comprising:

a battery body, a battery head part is arranged at the end part of the battery body;

a battery protection plate stacked on the first surface of the battery head and electrically connected to the battery body;

a first battery heat dissipation layer stacked on the first surface of the battery protection plate; and

a battery thermally conductive layer stacked on a second face of the battery header opposite the first face.

2. The battery pack according to claim 1,

the battery assembly further comprises a battery thermal insulation layer, and the battery thermal insulation layer is arranged on the first battery heat dissipation layer in a stacked mode.

3. The battery assembly of claim 1,

an electronic device is arranged on the first surface of the battery protection plate;

an electronic device is provided on a second surface of the battery protection board opposite to the first surface.

4. The battery assembly of claim 1,

and a second battery heat dissipation layer is stacked on a second surface, opposite to the first surface, of the battery protection plate.

5. The battery assembly of claim 1,

the first battery heat dissipation layer is a layer formed of a phase change material.

6. The battery assembly of claim 1,

the battery heat conduction layer is a graphene heat conduction layer.

7. The battery assembly of claim 2,

the battery heat-insulating layer is a heat-insulating foam layer.

8. The battery assembly of claim 2,

the distance between the outer surface of the battery thermal insulation layer and the second surface of the battery head is smaller than or equal to the thickness of the battery body.

9. The battery assembly of claim 1,

the battery heat conduction layer is further arranged on the battery body in an extending mode.

10. The battery assembly according to any one of claims 1 to 9,

the battery assembly further comprises a flexible circuit board which is electrically connected with the battery protection board;

a portion of the flexible circuit board is stacked on the first battery heat dissipation layer.

11. A mobile terminal, comprising:

a battery assembly according to any one of claims 1 to 10; the battery assembly comprises a first battery heat dissipation layer and a battery thermal insulation layer;

the battery heat conduction layer of the battery component is attached to the middle frame; and

the first battery heat dissipation layer or the battery heat insulation layer of the battery assembly is attached to the shell.