CN215266457U

CN215266457U - Battery module assembly, winding type lithium battery cell, battery module and electronic equipment

Info

Publication number: CN215266457U
Application number: CN202120944299.1U
Authority: CN
Inventors: 许柏皋; 陈禧昌; 刘辉
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-12-21
Anticipated expiration: 2031-04-30

Abstract

The utility model provides an electric core assembly, a winding type lithium battery cell, a battery module and an electronic device, wherein the electric core assembly comprises an electric core and a heating device, and the outer wall of the electric core comprises a first outer edge part and a second outer edge part which are arranged oppositely; the heating device can convert electric energy into heat energy when being electrified, so as to heat the battery core; wherein, the heating device is embedded in the electric core, and the distance between the heating device and the first outer edge part is basically equal to the distance between the heating device and the second outer edge part. This electricity core subassembly, coiling type lithium cell, battery module and electronic equipment can improve heating device's heating efficiency to improve the heating equilibrium at heating device to the different positions of electric core.

Description

Battery module assembly, winding type lithium battery cell, battery module and electronic equipment

Technical Field

The utility model relates to a battery technology field especially relates to an electric core subassembly, winding type lithium cell, battery module and electronic equipment.

Background

When the lithium battery of the electronic equipment works in a low-temperature working environment, the performance of the lithium battery can be greatly reduced. In order to realize normal operation of the lithium battery, the temperature of the working environment of the lithium battery is generally required to be controlled to be 5-60 ℃. If the lithium battery is charged in a low-temperature environment, such as an environment below 5 ℃, the problem that the charging efficiency is very low or even the charging is not performed occurs. In addition, the internal resistance of the lithium battery generally increases in a low-temperature environment, thereby greatly affecting the discharge performance of the lithium battery. For this reason, when the lithium battery is used in a low-temperature environment, it is generally heated by a heating device. However, the conventional heating device has low heating efficiency, and for a battery with a large volume, different parts of the battery core of the battery are heated unevenly, so that different parts of the battery core are aged at different speeds.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electric core subassembly, coiling type lithium cell, battery module and electronic equipment to improve heating device's heating efficiency, and improve the heating equilibrium at the different positions of heating device to electric core.

The utility model provides a cell subassembly, include:

the battery comprises a battery cell, wherein the outer wall of the battery cell comprises a first outer edge part and a second outer edge part which are oppositely arranged;

the heating device can convert electric energy into heat energy when being electrified so as to heat the battery cell;

wherein the heating device is embedded in the electric core, and the distance between the heating device and the first outer edge part is substantially equal to the distance between the heating device and the second outer edge part.

In the electric core assembly of the present invention, the heating device comprises a heating film or a coil; and/or the presence of a gas in the gas,

the heating device includes:

the membrane comprises a first membrane layer and a second membrane layer which are arranged in a laminated mode, wherein the first membrane layer and the second membrane layer are both made of insulating and electrolyte-resistant polymer materials;

and the resistance wire is clamped between the first film layer and the second film layer.

In the electric core assembly of the present invention, the first film layer and/or the second film layer includes at least one of the following: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film.

The utility model discloses an among the cell subassembly, still include:

the battery cell is arranged in the packaging shell, and the heating device is connected with the packaging shell in a packaging manner.

In the electric core assembly of the present invention, the packaging shell comprises an aluminum plastic film or a metal shell; and/or the presence of a gas in the gas,

the battery core is used for a laminated battery module, the packaging shell comprises four walls which are sequentially connected, and a resistance wire of the heating device penetrates out of at least one of the four walls; and/or the presence of a gas in the gas,

the electric core is used for an aluminum shell power battery module, the packaging shell comprises a bottom shell and a cover plate, the cover plate is connected with the bottom shell and matched with the bottom shell to form an accommodating cavity, the electric core and at least part of the heating device are accommodated in the packaging shell, the projection of the first film layer and/or the second film layer of the heating device on the surface where the electric core is located does not exceed the electric core, and the resistance wire of the heating device is welded on the pole of the cover plate.

The utility model also provides a coiling type lithium cell, include:

the battery cell comprises a positive plate, a diaphragm and a negative plate which are arranged in a laminated manner;

the heating device is arranged on one side, far away from the negative plate, of the positive plate, or on one side, far away from the positive plate, of the negative plate.

In the winding type lithium battery cell of the present invention, the heating device, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked; alternatively, the first and second electrodes may be,

the positive plate, the diaphragm, the negative plate and the heating device are sequentially stacked.

In the wound lithium battery cell of the present invention, the heating device includes a heating film or a coil; and/or the presence of a gas in the gas,

the heating device includes:

In the winding-type lithium battery cell of the present invention, the first film layer and/or the second film layer includes at least one of the following: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film.

The utility model discloses an in the coiling type lithium cell, still include:

In the winding type lithium battery cell of the present invention, the package case includes an aluminum plastic film or a metal case; and/or the presence of a gas in the gas,

The utility model also provides a battery module, include:

a housing; and

the battery cell assembly of any preceding claim, or the wound lithium battery cell of any preceding claim, wherein the battery cell assembly or the wound lithium battery cell is disposed within the housing.

The utility model discloses an among the battery module, the quantity of electricity core is including a plurality of, and is a plurality of electricity core interval sets up.

In the battery module of the present invention, each of the battery cells is correspondingly provided with at least one of the heating devices, and the heating devices corresponding to different battery cells form a series circuit, and the series circuit is electrically connected to a power supply device; alternatively, the first and second electrodes may be,

each electric core is correspondingly provided with at least one heating device, the heating devices corresponding to different electric cores form at least two series circuits, and the at least two series circuits are respectively and electrically connected with different electric connectors of the power supply device.

In the battery module of the present invention, the plurality of battery cells include a first battery cell, a second battery cell, a third battery cell and a fourth battery cell arranged in an array, a heating device corresponding to the first battery cell is connected in series with a heating device corresponding to the fourth battery cell, and the heating device corresponding to the first battery cell and the heating device corresponding to the fourth battery cell are electrically connected to a first electrical connector and a second electrical connector of the power supply device, respectively; the heating device corresponding to the second battery cell is connected in series with the heating device corresponding to the third battery cell, and the heating device corresponding to the second battery cell and the heating device corresponding to the third battery cell are respectively and electrically connected with the third electrical connector and the fourth electrical connector of the power supply device.

The utility model discloses an among the battery module, the battery module still includes:

a control unit for adjusting the heating power of the heating device by adjusting the duty cycle and/or the current of the heating device.

The utility model discloses an in the battery module, the duty cycle with electric core with distance between the casing is positive correlation.

and the filling piece is filled in a gap between the packaging shells corresponding to different battery cores, and/or is filled in a gap between the packaging shell corresponding to the battery core and the shell.

In the battery module of the present invention, the filling member can elastically deform during the expansion of the battery cell to protect the battery cell; and/or the presence of a gas in the gas,

the different battery cells can be subjected to heat transfer through the filling piece, so that the heat quantity among the battery cells is basically the same; and/or the presence of a gas in the gas,

the filling piece comprises at least one of foam, heat-conducting silica gel and metal heat-conducting fins.

The utility model also provides an electronic equipment, include:

a body; and

the battery module of any one of the above is arranged on the machine body.

The utility model provides an electricity core subassembly, coiling type lithium cell, battery module and electronic equipment, when heating device circular telegram, heating device can heat the inside of electric core, need not to carry out heat-conduction or heat radiation through packaging shell, has improved heating device's heating efficiency. In addition, can also improve the heating equilibrium at the different positions of heating device to electric core for the temperature at the different positions of electric core tends to unanimity when the temperature rises in electric core, and then guarantees that the ageing speed at the different positions of electric core is unanimous basically, guarantees that the uniformity of battery module back electric core that ages is better, has prolonged the life of electric core.

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 disclosure of embodiments of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of an electrical core assembly according to an embodiment of the present invention;

fig. 2 is a schematic view of a partial structure of a battery cell according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an electrical core assembly according to an embodiment of the present invention;

fig. 4 is a schematic partial structural view of a heating device according to an embodiment of the present invention;

fig. 5 is a schematic partial structural view of an electric core assembly according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an electrical core assembly according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a wound lithium battery cell according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a wound lithium battery cell according to an embodiment of the present invention;

fig. 9 is a schematic view of a wound lithium battery cell according to an embodiment of the present invention;

fig. 10 is a schematic view of a wound lithium battery cell according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a wound lithium battery cell according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 13 is a schematic view of a partial structure of a battery module according to an embodiment of the present invention;

fig. 14 is a schematic view of a partial structure of a battery module according to an embodiment of the present invention;

fig. 15 is a schematic view of a partial structure of a battery module according to an embodiment of the present invention;

fig. 16 is a schematic view illustrating a partial structure of a battery module according to an embodiment of the present invention;

fig. 17 is a schematic view of a partial structure of a battery module according to an embodiment of the present invention.

Description of reference numerals:

10. an electrical core assembly;

11. an electric core; 115. a positive electrode; 1151. a positive tab; 116. a diaphragm; 117. a negative electrode; 1171. a negative tab;

12. a heating device; 121. a first film layer; 122. a second film layer; 123. a resistance wire;

13. a packaging housing; 132. a bottom case; 133. a cover plate; 1331. a pole column; 134. an accommodating cavity;

20. a wound lithium battery cell;

21. an electric core; 211. a positive plate; 212. a diaphragm; 213. a negative plate;

22. a heating device; 23. a packaging housing;

100. a battery module;

30. a housing; 41. an electric core; 42. a heating device; 50. a filling member; 60. a first conductive connector; 70. a second conductive connector;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

The utility model discloses an inventor discovers, and electric core of electric core subassembly is at microthermal operational environment during operation, and its performance can greatly reduced. For this reason, the conventional electric core assembly generally includes an outer casing, an electric core encapsulated in the outer casing, and a heating film for heating the electric core, the heating film being disposed outside the outer casing of the electric core assembly. However, in the electric core assembly with such a structure, the heat generated by the heating film needs to be conducted or radiated to the electric core in the outer casing through the outer casing, so that the electric core is heated, the heating efficiency is low, and the problem of unbalanced heating of different parts of the electric core exists.

Therefore, the present invention provides an electric core assembly, a winding-type lithium core, a battery module and an electronic device, so as to improve the heating efficiency of the heating device and the heating balance of the heating device to different positions of the electric core.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, an embodiment of the present invention provides a battery cell assembly 10 including a battery cell 11 and a heating device 12. The outer surface of the battery cell 11 includes a first outer edge portion and a second outer edge portion that are arranged oppositely. The heating device 12 can convert electric energy into heat energy when being powered on, so as to heat the battery cell 11. The heating device 12 is embedded in the battery cell 11. The distance between the heating means 12 and the first outer edge portion is substantially equal to the distance between the heating means 12 and the second outer edge portion.

In the battery cell assembly 10 of the above embodiment, since the heating device 12 is embedded in the battery cell 11, when the heating device 12 is powered on, the heating device 12 can heat the inside of the battery cell 11, and heat conduction or heat radiation through the packaging shell 13 (see fig. 1) is not needed, so that the heating efficiency of the heating device 12 is improved. In addition, because the heating device 12 is embedded in the battery cell 11, an assembly space is provided for other components (such as the filling member 50 in fig. 15) arranged outside the packaging shell 13, and the problem that the normal operation of other components such as the filling member 50 is affected due to the fact that the heating device 12 is arranged outside the packaging shell 13 is solved.

In addition, the distance between the heating device 12 and the first outer edge part is equal to the distance between the heating device 12 and the second outer edge part, the heating balance of the heating device 12 to different parts of the battery cell 11 is improved by the position design of the heating device 12, so that the temperatures of the battery cell 11 at different parts of the battery cell 11 tend to be consistent when the temperature rises, the aging speeds of the different parts of the battery cell 11 are basically consistent, the consistency of the battery cell 11 after the battery cell assembly 10 is aged is better, and the service life of the battery cell 11 is prolonged.

It is understood that the first outer edge portion and the second outer edge portion may be two portions of any two outer side walls of the battery cell 11 that are oppositely disposed.

Illustratively, the first outer edge portion is disposed directly opposite the second outer edge portion.

For example, referring to fig. 1, the outer surface of the battery cell 11 includes a first outer edge 111 and a second outer edge 112 that are disposed opposite to each other. The distance between the heating means 12 and the first outer edge portion 111 is substantially equal to the distance between the heating means 12 and the second outer edge portion 112.

For another example, referring to fig. 1, the outer surface of the battery cell 11 includes a first outer edge portion 113 and a second outer edge portion 114, which are oppositely disposed. The distance between the center of the heating device 12 and the first outer edge portion 113 is substantially equal to the distance between the center of the heating device 12 and the second outer edge portion 114.

Illustratively, the distance between the heating device 12 and the first outer edge portion is d1 and the distance between the heating device 12 and the second outer edge portion is d 2. d1 is substantially equal to d2, including d1 being equal to d2, and the absolute value of the difference between d1 and d2 being less than or equal to a predetermined value. The preset value can be set according to actual requirements, such as 1mm, 2mm, 3mm, 5mm, 8mm, 10mm and any other suitable value between 0 and 10 mm.

The shape of the electric core assembly 10 can be set according to actual requirements, for example, the electric core assembly can be in a column shape, an arc shape, a soft-package square shape, a bag shape or an abnormal shape.

Referring to fig. 2, in some embodiments, the battery cell 11 includes a positive electrode 115, a separator 116, and a negative electrode 117, where the separator 116 is used to separate the positive electrode 115 and the negative electrode 117, so as to prevent the positive electrode 115 and the negative electrode 117 from contacting and short-circuiting. In addition, the separator 116 can also pass electrolyte ions, thereby achieving conversion of chemical energy and electric energy between the positive electrode 115 and the negative electrode 117.

It is to be understood that the separator 116 may be provided in one or more strips according to the distribution of the positive electrode 115 and the negative electrode 117. For example, when the separator 116 is a strip, the separator 116 is wrapped around one of the positive electrode 115 or the negative electrode 117, and the other of the positive electrode 115 or the negative electrode 117 is attached to the separator 116, so that the separator 116 separates the positive electrode 115 and the negative electrode 117. For another example, when the separator 116 is a plurality of separators 116, the separator 116 is attached to each of the positive electrode 115 and the negative electrode 117. Illustratively, the positive electrode 115 and/or the negative electrode 117 are provided with one, two, three, four, or more.

It is understood that the positions of the positive electrode 115 and the negative electrode 117 in fig. 2 can be interchanged, and are not limited herein.

Referring to fig. 3, positive tab 1151 is illustratively disposed on positive electrode 115 and negative tab 1171 is illustratively disposed on negative electrode 117. The positive tab 1151 and the negative tab 1171 may be electrically connected to an external power supply or an external powered device.

In some embodiments, the heating device 12 comprises a heating film or coil.

Referring to fig. 4 and 5, the heating device 12 illustratively includes a heating film. The heating device 12 includes a first film 121, a second film 122, and a resistive wire 123. The first film layer 121 and the second film layer 122 are disposed in a stack. The first film 121 and the second film 122 are made of an insulating and electrolyte-resistant polymer material. The resistance wire 123 is sandwiched between the first film 121 and the second film 122.

Illustratively, the first film 121 and the second film 122 can protect the resistance wire 123, and prevent the resistance wire 123 from contacting the positive electrode 115 or the negative electrode 117 of the battery cell 11, and the like, so as to interfere with the normal operation of the battery cell 11 or the resistance wire 123.

It will be appreciated that the resistance wire 123 can be electrically connected to a power supply to power the resistance wire 123. The power supply device can be the cell assembly 10, and can also be an external power supply. The external power source may include a charger or the like.

For example, the power supply device connected to the heating device 12 may be the same as or different from the external power supply device connected to the battery cell 11, and is not limited herein.

Illustratively, the first film layer 121 and/or the second film layer 122 includes at least one of: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film, and the like, which are made of electrolyte-resistant materials.

Illustratively, the first film 121 and the second film 122 are both polypropylene films, which are capable of resisting electrolyte corrosion, and are capable of being connected with the package casing 13 (see fig. 1) made of polypropylene, so as to provide a guarantee for the manufacturing process of embedding the heating device 12 in the battery cell 11.

The heating device 12 is fixedly connected to the cell 11, for example, by a hot-working process.

Referring to fig. 1, in some embodiments, the battery cell assembly 10 further includes a packaging shell 13. The battery cell 11 is arranged in the packaging shell 13. The heating device 12 is connected to the packaging shell 13 in an encapsulated manner, so that the heating device 12 is fixed.

Illustratively, the battery cell 11 and the package housing 13 can form a whole body which is not movable relatively by means of adhesion, snap fit or clamping.

In some embodiments, the package housing 13 comprises an aluminum plastic film or a metal shell. The metal case may include at least one of a stainless steel case or an aluminum case, etc.

Referring to fig. 3, the battery cell 11 is used for a laminated battery module, and the package housing 13 includes four walls connected in sequence, and the resistance wire 123 of the heating device 12 penetrates through at least one of the four walls.

Referring to fig. 3, the package housing 13 illustratively includes a first wall 131a, a second wall 131b, a third wall 131c, and a fourth wall 131d connected end-to-end. The resistance wire 123 of the heating device 12 is passed out from any one of the first wall 131a, the second wall 131b, the third wall 131c, and the fourth wall 131d to be electrically connected to the power supply device. Illustratively, the resistance wire 123 of the heating device 12 passes out of the first wall 131 a.

Illustratively, the battery cell 11 is used for a laminated battery module, and the package housing 13 includes six walls, which cooperate to form a cavity (not labeled) for accommodating the battery cell 11. The resistance wire 123 of the heating means 12 passes out of at least one of the six walls.

Referring to fig. 6, in some embodiments, the battery cell 11 is used in an aluminum-casing power battery module. The package housing 13 includes a bottom case 132 and a cover plate 133. The cover plate 133 is connected to the bottom shell 132 and cooperates therewith to form a receiving cavity 134. The battery cell 11 and at least part of the heating device 12 are accommodated in a package housing 13. The resistance wire 123 of the heating device 12 is welded to the post 1331 of the cover plate 133. The projection of the first film 121 and/or the second film 122 of the heating device 12 on the surface where the battery cell 11 is located does not exceed the battery cell 11, so that on the premise that the battery cell 11 is normally heated by the heating device 12, the size of the first film 121 and/or the second film 122 is reduced as much as possible, the processing cost is reduced, the weight of the battery cell assembly 10 is reduced, and the volume of the battery cell assembly 10 is reduced.

Illustratively, the cover plate 133 may be fixedly connected with the bottom case 132 by a snap structure, an adhesive layer, or screws.

Referring to fig. 7 and 8, an embodiment of the present invention provides a winding-type lithium battery cell 20, including a battery cell 21 and a heating device 22. The battery cell 21 includes a positive electrode sheet 211, a separator 212, and a negative electrode sheet 213, which are stacked. The heating device 22 can convert electric energy into heat energy when being electrified, so as to heat the battery cell 21. The heating device 22 is disposed on the side of the positive electrode tab 211 away from the negative electrode tab 213, or on the side of the negative electrode tab 213 away from the positive electrode tab 211.

Referring to fig. 7 and 8, the battery cell 21 and the heating device 22 are formed by winding and forming into a whole. The heating device 22 is provided on the side of the positive electrode tab 211 away from the negative electrode tab 213, or on the side of the negative electrode tab 213 away from the positive electrode tab 211.

In the wound lithium battery cell 20 of the above embodiment, the heating device 22 is provided on the side of the positive electrode sheet 211 away from the negative electrode sheet 213, or on the side of the negative electrode sheet 213 away from the positive electrode sheet 211. When the heating device 22 is powered on, the heating device 22 can heat the battery cell 21 without heat conduction or heat radiation through the package shell 23 (see fig. 11), so that the heating efficiency of the heating device 22 is improved. In addition, the winding type lithium battery cell 20 can also improve the heating balance of the heating device 22 to different positions of the battery cell 21, so that the temperatures of the battery cell 21 at different positions tend to be consistent when the temperature of the battery cell 21 rises, the aging speeds of the battery cells 21 at different positions are basically consistent, the consistency of the battery cells 21 after the winding type lithium battery cell 20 is aged is better, and the service life of the battery cells 21 is prolonged.

It is understood that the separator 212 serves to separate the positive and

negative electrode tabs

211 and 213, thereby preventing the positive and

negative electrode tabs

211 and 213 from contacting and short-circuiting. In addition, the separator 212 can also pass electrolyte ions, thereby achieving conversion of chemical energy and electrical energy between the positive electrode tab 211 and the negative electrode tab 213.

It is understood that the separator 212 may be provided in one or more strips according to the distribution of the positive electrode tab 211 and the negative electrode tab 213. For example, when the separator 212 is a strip, the separator 212 is wrapped around one of the positive electrode tab 211 or the negative electrode tab 213, and the other of the positive electrode tab 211 or the negative electrode tab 213 is attached to the separator 212, so that the separator 212 separates the positive electrode tab 211 from the negative electrode tab 213. For example, when the separator 212 has a plurality of sheets, the separator 212 is attached to each of the positive electrode sheet 211 and the negative electrode sheet 213. Illustratively, the positive electrode tab 211 and/or the negative electrode tab 213 are provided with one, two, three, four, or more.

It is to be understood that the positions of the positive electrode tab 211 and the negative electrode tab 213 in fig. 7 and 8 may be interchanged, and are not limited herein.

For example, referring to fig. 7, the heating device 22 is disposed on the side of the positive electrode tab 211 away from the negative electrode tab 213. The separator 212 is provided on the side of the positive electrode sheet 211 facing the negative electrode sheet 213. That is, the heating device 22 and the separator 212 are provided on opposite sides of the positive electrode tab 211, respectively.

For example, referring to fig. 8, the heating device 22 is disposed on the side of the negative electrode tab 213 away from the positive electrode tab 211. The separator 212 is provided on the side of the negative electrode sheet 213 facing the positive electrode sheet 211. Namely, the heating device 22 and the separator 212 are respectively provided on opposite sides of the negative electrode tab 213.

Referring to fig. 7 and 9, in some embodiments, the heating device 22, the positive electrode tab 211, the separator 212, and the negative electrode tab 213 are sequentially stacked.

Referring to fig. 8 and 10, in some embodiments, the positive electrode tab 211, the separator 212, the negative electrode tab 213, and the heating device 22 are sequentially stacked.

In some embodiments, the heating device 22 comprises a heating film or coil.

In some embodiments, the heating device 22 comprises: the first film layer and the second film layer are arranged in a stacked mode and are made of insulating and electrolyte-resistant polymer materials; the resistance wire is clamped between the first film layer and the second film layer. For example, the heating device 22 of the wound lithium battery cell 20 refers to the heating device 12 of any one of the embodiments of fig. 4 to 6, and will not be described again.

In some embodiments, the first film layer and/or the second film layer comprises at least one of: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film, and the like, which are made of electrolyte-resistant materials.

Illustratively, the first film and the second film are both polypropylene films, which are capable of resisting electrolyte corrosion, and can be connected with a package casing 23 (see fig. 11) made of polypropylene in a packaging manner, so as to provide a guarantee for the processing technology of embedding the heating device 22 in the battery cell 21.

The heating device 22 is fixedly connected to the battery cell 21, for example, by a hot working process.

Referring to fig. 11, the wound lithium battery cell 20 further includes a package case 23. The battery cell 21 and at least part of the heating device 22 are disposed in a package housing 23. The heating device 22 is connected with the packaging shell 23 in an encapsulating manner, so that the heating device 22 is fixed.

It can be understood that at least part of the heating device 22 is disposed in the package casing 23, and when the heating device 22 is powered on, the heating device 22 can heat the battery cell 21 without heat conduction or heat radiation through the package casing 23, so that the heating efficiency of the heating device 22 is improved.

Illustratively, the battery cell 21 and the heating device 22 are formed by winding to form a whole, and at least part of the heating device 22 is disposed in the package casing 23, so as to provide an assembly space for other components (such as the filling member 50 in fig. 15) disposed outside the package casing 23, and solve the problem that the normal operation of other components such as the filling member 50 is affected by the heating device 22 disposed outside the package casing 23.

In some embodiments, the package housing 23 comprises an aluminum plastic film or a metal shell. The metal case may include at least one of a stainless steel case or an aluminum case, etc.

In some embodiments, the battery cell 21 is used for an aluminum-casing power battery module, the package housing 23 includes a bottom casing and a cover plate, the cover plate is connected to the bottom casing and is matched with the bottom casing to form an accommodating cavity, the battery cell 21 and at least a part of the heating device 22 are accommodated in the package housing 23, a projection of the first film layer and/or the second film layer of the heating device 22 on the surface where the battery cell 21 is located does not exceed the battery cell 21, and a resistance wire of the heating device 22 is welded to a pole of the cover plate. For example, the wound lithium battery cell 20 of the present embodiment may refer to fig. 6 and the battery cell assembly 10 of the corresponding embodiment, which are not described herein again.

Referring to fig. 12, an embodiment of the invention provides a battery module 100. The battery module 100 includes, but is not limited to, a lithium ion battery module, a lithium metal battery module, a lithium-polymer battery module, a lead-acid battery module, a nickel-metal hydride battery module, a nickel-manganese-cobalt battery module, a lithium-sulfur battery module, a lithium-air battery module, a nickel-hydrogen battery module, a lithium ion battery module, a ferroelectric battery module, a nano battery module, and other solid state battery modules. In the embodiment of the present application, the battery module 100 is taken as a lithium ion battery as an example for description, and those skilled in the art can easily think of performing structural design on other types of battery modules according to the technical means of the embodiment.

Referring to fig. 12, in some embodiments, the battery module 100 includes a housing 30, and the battery cell assembly according to any of the above embodiments or the wound lithium battery cell according to any of the above embodiments. The electric core assembly or the winding type lithium battery cell is arranged in the shell.

Illustratively, the electric core assembly is the electric core assembly 10 in any of the embodiments described above. The wound lithium battery cell is the wound lithium battery cell 20 of any of the above embodiments.

Illustratively, the battery cell 41 of the battery module 100 is the battery cell 11 of the battery cell assembly 10 of any of the embodiments or the battery cell 21 of the winding-type lithium battery cell 20 of any of the embodiments.

Illustratively, the heating device 42 of the battery module 100 is the heating device 12 of the electric core assembly 10 of any of the above embodiments or the heating device 22 of the wound-type lithium core 20 of any of the above embodiments.

In the battery module 100 of the above embodiment, when the heating device 42 is powered on, the heating device 42 can heat the inside of the battery cell 41, and heat conduction or heat radiation through the packaging shell 30 (see fig. 12) is not required, so that the heating efficiency of the heating device 42 is improved. In addition, can also improve the heating equilibrium at the different positions of heating device 42 to electric core 41 for electric core 41 is when the temperature risees the temperature at the different positions of electric core 41 tends to unanimously, and then guarantees that the ageing speed at the different positions of electric core 41 is unanimous basically, guarantees that battery module 100 is ageing back electric core 41's uniformity better, has prolonged electric core 41's life.

It can be understood that at least part of the heating device 42 is disposed in the packaging shell of the corresponding battery cell 41, so as to provide an assembly space for other components (such as the filling member 50 in fig. 15) disposed outside the packaging shell, and solve the problem that the heating device 42 disposed outside the packaging shell affects the normal operation of other components such as the filling member 50.

The shape of the battery module 100 may be designed according to actual requirements, such as a column, a bag, an arc, a soft pack, a square, a cylinder, a prismatic, or a special shape.

The number of the battery cells 41 may be designed according to actual requirements, such as one or more. Illustratively, the number of the battery cells 41 is two, three, four, five, six, or more. Each electric core 41 is correspondingly provided with at least one heating device 42 to ensure balanced heating of each electric core 41, reduce the temperature difference of each electric core 41, further reduce the internal resistance difference and voltage unbalance of each electric core 41 caused by the temperature difference, and further balance the service life of each electric core 41.

For example, the number of the battery cells 41 includes a plurality of battery cells, and the plurality of battery cells 41 may be connected in series, may also be connected in parallel, and may also be combined in series and parallel. The voltage of the battery module 100 is increased by the series connection, and the capacity of the battery module 100 is increased by the parallel connection.

Referring to fig. 12, for example, the number of the battery cells 41 includes a plurality of battery cells 41, and the plurality of battery cells 41 are arranged at intervals. Illustratively, a plurality of battery cells 41 are arranged at intervals to provide an installation space for the filler 50 (see fig. 15). For example, the arrangement of the plurality of battery cells 41 at intervals can increase the contact area between the package housing 30 corresponding to the battery cells 41 and the air, so as to increase the heat dissipation efficiency of the battery cells 41, reduce the temperature difference of each battery cell 41, and further reduce the internal resistance difference and the voltage imbalance of each battery cell 41 caused by the temperature difference, thereby balancing the service life of each battery cell 41.

Referring to fig. 13, in some embodiments, at least one heating device 42 is disposed in each of the battery cells 41, and the heating devices 42 corresponding to different battery cells 41 form a series circuit, and the series circuit is electrically connected to the power supply device. Thus, the battery module 100 has a simple structure and is convenient to process or use.

Referring to fig. 13, the battery module 100 includes four battery cells 41, namely a first battery cell 41a, a second battery cell 41b, a third battery cell 41c, and a fourth battery cell 41 d. The number of the heating devices 42 is four correspondingly. The first cell 41a is correspondingly provided with a first heating device 42 a. The second cell 41b is correspondingly provided with a second heating device 42 b. The third cell 41c is correspondingly provided with a third heating device 42 c. The fourth cell 41d is correspondingly provided with a fourth heating device 42 d. The first heating device 42a is connected in series with the second heating device 42b, the second heating device 42b is connected in series with the third heating device 42c, and the third heating device 42c is connected in series with the fourth heating device 42d, that is, the first heating device 42a, the second heating device 42b, the third heating device 42c and the fourth heating device 42d are connected in series to form a series circuit, and the first heating device 42a and the fourth heating device 42d are respectively electrically connected to the power supply device.

Referring to fig. 13, a first heating device 42a is illustratively connected in series with a second heating device 42b via a first electrically conductive connector 60. The electrical connection structure of the heating device 42 and the power supply device or the series connection structure between different heating devices are the same, and will not be described herein.

Referring to fig. 13, for example, a first cell 41a, a second cell 41b, a third cell 41c and a fourth cell 41d are connected in series. The first cell 41a is connected in series with the second cell 41b via a second electrically conductive connector 70. The series connection structure between the other different battery cells 41 is the same, and will not be described herein again.

Referring to fig. 14, in some embodiments, at least one heating device 42 is disposed on each of the battery cells 41. The heating devices 42 corresponding to different battery cells 41 form at least two series circuits, and the at least two series circuits are respectively electrically connected to different electrical connectors of the power supply device. It can be understood that, in the actual use process of the battery module 100, the heat dissipation capability of the battery cell 41 close to the center of the battery module 100 is smaller than the heat dissipation capability of the battery cell 41 far from the center of the battery module 100. The battery module 100 of the embodiment of the present application can control the heating power of different series circuits or control the heating power of different heating devices 42, thereby ensuring that each battery cell 41 is heated in an equalizing manner, reducing the temperature difference of each battery cell 41, and further reducing the internal resistance difference and the voltage imbalance of each battery cell 41 caused by the temperature difference, so as to equalize the service life of each battery cell 41.

Referring to fig. 14, for example, the heating devices 42 corresponding to different battery cells 41 form two series circuits, and the two series circuits are respectively electrically connected to different electrical connection interfaces of the power supply device. In other embodiments, the heating devices 42 corresponding to different battery cells 41 may also form n series circuits, where n is three, four, or more, and n is a positive integer, and n is less than or equal to the number of the heating devices 42 of the battery module 100. For example, the number of the battery cells 41 of the battery module 100 is four, and each battery cell 41 is correspondingly provided with one heating device 42. The four heating devices 42 form 4 series circuits, and each heating device 42 is electrically connected to a different electrical connection interface of the power supply device.

Referring to fig. 14, in some embodiments, the plurality of battery cells 41 includes a first battery cell 41, a second battery cell 41, a third battery cell 41, and a fourth battery cell 41 arranged in an array. The heating device 42 corresponding to the first cell 41 is connected in series with the heating device 42 corresponding to the fourth cell 41, and the heating device 42 corresponding to the first cell 41 and the heating device 42 corresponding to the fourth cell 41 are respectively electrically connected with the first electrical connector and the second electrical connector of the power supply device. The heating device 42 corresponding to the second cell 41 is connected in series with the heating device 42 corresponding to the third cell 41, and the heating device 42 corresponding to the second cell 41 and the heating device 42 corresponding to the third cell 41 are respectively electrically connected with the third electrical connector and the fourth electrical connector of the power supply device.

Illustratively, the first battery cell 41, the second battery cell 41, the third battery cell 41 and the fourth battery cell 41 are arranged at intervals along a preset straight line.

Referring to fig. 14, the battery module 100 exemplarily includes four battery cells 41, namely a first battery cell 41a, a second battery cell 41b, a third battery cell 41c, and a fourth battery cell 41 d. The number of the heating devices 42 is four correspondingly. The first cell 41a is correspondingly provided with a first heating device 42 a. The second cell 41b is correspondingly provided with a second heating device 42 b. The third cell 41c is correspondingly provided with a third heating device 42 c. The fourth cell 41d is correspondingly provided with a fourth heating device 42 d.

The first heating device 42a and the fourth heating device 42d are connected in series to form a series circuit, the first heating device 42a is electrically connected to the first electrical connection port of the power supply device, and the fourth heating device 42d is electrically connected to the second electrical connection port of the power supply device. The second heating device 42b is connected in series with the fourth heating device 42d to form another series circuit, and the second heating device 42b is connected to the third electrical connection port of the power supply device. The fourth heating device 42d is electrically connected to the fourth electrical connection port of the power supply device.

The power supply device may be the battery cell 41 or a circuit formed by each battery cell 41, or may be an external power supply. The external power source may include a charger or the like.

In some embodiments, the battery module 100 further includes a control unit (not shown). The control unit adjusts the heating power of the heating device 42 by adjusting the duty ratio and/or the current of the heating device 42, so as to ensure that the battery cells 41 are heated in a balanced manner, reduce the temperature difference of the battery cells 41, and further reduce the internal resistance difference and the voltage imbalance of the battery cells 41 caused by the temperature difference, thereby balancing the service life of the battery cells 41.

In some embodiments, the duty ratio is positively correlated with the distance between the battery cells 41 and the casing 30, so as to ensure uniform heating of the battery cells 41 and reduce the temperature difference of the battery cells 41.

Referring to fig. 15, in some embodiments, the battery module 100 further includes a filling member 50. The filling member 50 is filled in a gap between the package casings corresponding to the different battery cells 41, and/or a gap between the package casing corresponding to the battery cell 41 and the casing 30.

Illustratively, each cell 41 is provided with a package housing. The packaging shell refers to the packaging shell of any one of the above embodiments, and is not described in detail herein.

In some embodiments, the filler 50 can elastically deform during expansion of the cell 41 to protect the cell 41. Thus, it is possible to ensure that the cell 41 has a sufficient expansion space, thereby improving the service life of the cell 41.

Illustratively, the filling member 50 includes at least one of foam, silicone, and the like.

Referring to fig. 15, in some embodiments, different cells 41 can be thermally transferred through the filler 50, such that the heat between the cells 41 is substantially the same. Since the filler 50 can perform the function of heat transfer, the battery module 100 of the present embodiment, the heating device 42 and the filler 50 performing the function of heat transfer can be simultaneously mounted on the battery cell 41, so as to achieve both heating and heat dissipation of the battery cell 41. Illustratively, the filler 50 is in thermally conductive contact between different cells 41; and/or the filler 50 is in heat-conducting contact between the battery cell 41 and the housing 30. Thus, the heat dissipation of each battery cell 41 is uniform, and the temperature difference of each battery cell 41 is reduced, so that the internal resistance difference and the voltage imbalance of each battery cell 41 caused by the temperature difference are reduced, and the service life of each battery cell 41 is further balanced.

It is understood that "+" in fig. 15 represents the total positive electrode of the battery module 100 and "-" represents the total negative electrode of the battery module 100.

Illustratively, the filling member 50 includes at least one of a thermally conductive silicone, a metallic thermally conductive sheet, and the like.

It is understood that, in some embodiments, the filler 50 can be elastically deformed during the expansion of the battery cells 41 to protect the battery cells 41, and different battery cells 41 can be subjected to heat transfer through the filler 50, so that the heat quantity between the battery cells 41 is substantially the same. For example, the filling member 50 includes a thermally conductive silicone gel or the like.

For example, a plurality of battery cells 41 may share one filler 50. For example, each battery cell 41 may also be provided with one filling member 50 separately, or one filling member 50 may be provided separately adjacent to the battery cell 41.

The shape of the filling member 50 can be designed according to practical requirements, and is not limited herein. For example, as in fig. 12 and 15. As another example, E-shaped in fig. 16. Again, for example, S-shaped as in fig. 17.

The utility model also provides an electronic equipment, including organism and the battery module of any above-mentioned embodiment. The battery module is arranged on the machine body.

The electronic equipment of above-mentioned embodiment, when the heating device circular telegram of battery module, heating device can heat the inside of electric core, need not to carry out heat conduction or heat radiation through packaging shell, has improved heating device's heating efficiency. In addition, can also improve the heating equilibrium at the different positions of heating device to electric core for the temperature at the different positions of electric core tends to unanimity when the temperature rises in electric core, and then guarantees that the ageing speed at the different positions of electric core is unanimous basically, guarantees that the uniformity of battery module back electric core that ages is better, has prolonged the life of electric core.

In addition, because the heating device is embedded in the electric core, an assembly space is provided for other components (such as the filling piece 50 in fig. 15) arranged outside the packaging shell, and the problem that the heating device arranged outside the packaging shell influences the normal operation of other components such as the filling piece 50 is solved.

Illustratively, the electronic device may include at least one of a drone, a power tool, an electric car, a cell phone, a tablet, and the like.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular method step, feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular method steps, features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An electric core assembly, comprising:

2. The electric core assembly according to claim 1, wherein said heating means comprises a heating film or coil; and/or the presence of a gas in the gas,

the heating device includes:

3. The electric core assembly according to claim 2, wherein said first film layer and/or said second film layer comprises at least one of: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film.

4. The electrical core assembly of any one of claims 1-3, further comprising:

5. The electrical core assembly of claim 4, wherein the package housing comprises an aluminum plastic film or a metal shell; and/or the presence of a gas in the gas,

6. A wound lithium battery cell, comprising:

7. The wound lithium battery cell according to claim 6, wherein the heating device, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked; alternatively, the first and second electrodes may be,

8. The wound lithium battery cell of claim 6 or 7, wherein the heating device comprises a heating film or coil; and/or the presence of a gas in the gas,

the heating device includes:

9. The wound lithium battery cell of claim 8, wherein the first film layer and/or the second film layer comprises at least one of: polyvinyl chloride film, polyethylene film, polypropylene film, polystyrene film, polytetrafluoroethylene film, polyester terephthalate film, polyamide film.

10. The wound lithium battery cell of claim 6 or 7, further comprising:

11. The wound lithium battery cell of claim 10, wherein the package casing comprises an aluminum plastic film or a metal casing; and/or the presence of a gas in the gas,

12. A battery module, comprising:

a housing; and

the battery cell assembly of any of claims 1-5 or the wound lithium battery cell of any of claims 6-11, the battery cell assembly or the wound lithium battery cell disposed within the housing.

13. The battery module of claim 12, wherein the number of the cells comprises a plurality of the cells, and the plurality of the cells are arranged at intervals.

14. The battery module according to claim 13, wherein at least one heating device is provided for each of the battery cells, and the heating devices corresponding to different battery cells form a series circuit, and the series circuit is electrically connected to a power supply device; alternatively, the first and second electrodes may be,

15. The battery module of claim 14, wherein the plurality of battery cells include a first battery cell, a second battery cell, a third battery cell, and a fourth battery cell arranged in an array, the heating device corresponding to the first battery cell is connected in series with the heating device corresponding to the fourth battery cell, and the heating device corresponding to the first battery cell and the heating device corresponding to the fourth battery cell are electrically connected to the first electrical connector and the second electrical connector of the power supply device, respectively; the heating device corresponding to the second battery cell is connected in series with the heating device corresponding to the third battery cell, and the heating device corresponding to the second battery cell and the heating device corresponding to the third battery cell are respectively and electrically connected with the third electrical connector and the fourth electrical connector of the power supply device.

16. The battery module according to claim 13, further comprising:

17. The battery module of claim 16, wherein the duty cycle is positively correlated with a distance between the cell and the housing.

18. The battery module according to any one of claims 13 to 17, further comprising:

19. The battery module of claim 18, wherein the filler is capable of elastically deforming during expansion of the cells to protect the cells; and/or the presence of a gas in the gas,

20. An electronic device, comprising:

a body; and

the battery module according to any one of claims 12 to 19, which is provided on the housing.