阅读说明：本技术 电池包和车辆 (Battery pack and vehicle ) 是由 章驰威 钱昊 吕喆 杨恒 张磊 于 2021-07-15 设计创作，主要内容包括：本申请实施例提供一种电池包和车辆,涉及车辆技术领域。本申请实施例提供电池包,包括壳体和电芯模组,电芯模组设置于壳体内,电芯模组包括固定框架和设置在固定框架内的电池组,电池组的至少一个侧壁上设置有加热膜,电池组包括固定框架和设置在固定框架内的多个电池单体,多个电池单体沿第一方向依次排列；加热膜的边缘具有多个凸部,多个凸部沿第一方向依次排列。本申请实施例提供的车辆,至少包括上述电池包。本申请实施例的电池包,其加热膜的边缘具有凸部,能通过凸部分散加热膜受到的张力,避免加热膜损坏或脱落。(The embodiment of the application provides a battery pack and a vehicle, and relates to the technical field of vehicles. The embodiment of the application provides a battery pack, which comprises a shell and a battery cell module, wherein the battery cell module is arranged in the shell and comprises a fixed frame and a battery pack arranged in the fixed frame, at least one side wall of the battery pack is provided with a heating film, the battery pack comprises the fixed frame and a plurality of battery monomers arranged in the fixed frame, and the plurality of battery monomers are sequentially arranged along a first direction; the edge of the heating film has a plurality of convex portions, and the plurality of convex portions are arranged in order along the first direction. The vehicle that this application embodiment provided, at least includes above-mentioned battery package. The battery pack of this application embodiment, its edge that heats the membrane has the convex part, can avoid heating the damage of membrane or drop through the tensile that the convex part dispersion heated the membrane and received.)

1. The utility model provides a battery pack, includes casing and electric core module, electric core module set up in the casing, electric core module includes fixed frame and sets up group battery in the fixed frame, be provided with heating film, its characterized in that on at least one lateral wall of group battery: the battery pack comprises a plurality of battery monomers arranged in the fixed frame, and the battery monomers are sequentially arranged along a first direction; the edge of the heating film is provided with a plurality of convex parts which are sequentially arranged along the first direction.

2. The battery pack according to claim 1, wherein: the convex parts comprise first convex parts and second convex parts, a plurality of first convex parts are arranged at the first edge of the heating film, and a plurality of second convex parts are arranged at the second edge of the heating film;

the first edge and the second edge are located at opposite ends of the heating film.

3. The battery pack according to claim 2, wherein: the first edge is provided with a plurality of first concave parts which are sequentially arranged along the first direction, and one first concave part is arranged between two adjacent first convex parts;

the second edge is provided with a plurality of second concave parts which are sequentially arranged along the first direction, and one second concave part is arranged between two adjacent second convex parts.

4. The battery pack according to claim 3, wherein: the first convex part, the second convex part, the first concave part and the second concave part are all arc-shaped;

the plurality of first convex parts and the plurality of first concave parts form a continuous wave shape, and the plurality of second convex parts and the plurality of second concave parts form a continuous wave shape.

5. The battery pack according to any one of claims 2 to 4, wherein: the first protruding portion is located between two adjacent battery cells, and the second protruding portion is located between two adjacent battery cells.

6. The battery pack according to any one of claims 2 to 4, wherein: the heating film is provided with a plurality of through holes which are sequentially arranged along the first direction, and the through holes are positioned between two adjacent battery monomers;

the through holes are strip-shaped holes, the strip-shaped holes extend along a second direction, and the second direction is perpendicular to the first direction.

7. The battery pack according to claim 6, wherein: the through holes comprise first through holes and second through holes, the first through holes are close to the first edges, the second through holes are close to the second edges, and the first through holes and the second through holes are arranged in a staggered mode along the first direction.

8. The battery pack according to any one of claims 1 to 4, wherein: the shell comprises a bottom shell and an upper cover, and the upper cover is connected to the bottom shell;

a gel layer is arranged on the inner bottom surface of the bottom shell, and the bottom surface of the battery cell module is connected with the gel layer;

the internal perisporium of drain pan is equipped with the insulating layer, the internal perisporium of upper cover is equipped with the cotton layer of heat preservation.

9. The battery pack according to any one of claims 1 to 4, wherein: the battery pack further comprises a monitoring device and a gas sensor;

the monitoring device is arranged on the shell and is electrically connected with the battery cell module;

the gas sensor is arranged in the shell and electrically connected with the monitoring device.

10. A vehicle, characterized in that it comprises at least a battery pack according to any one of claims 1-9.

Technical Field

The application relates to the technical field of vehicles, in particular to a battery pack and a vehicle.

Background

With the environmental protection, low-carbon economy and energy consumption reduction concepts being regarded as important, electric vehicles mainly powered by electric energy gradually become the development direction of future vehicles. The battery pack is one of core components of an electric automobile and comprises a shell and a battery pack arranged in the shell. The proper temperature is particularly important for maintaining the normal operation of the battery pack, and the performance of the battery pack is reduced due to the excessively low temperature, so that the battery pack cannot operate normally.

In the related art, a heating film is attached to the surface of the battery pack, and the battery pack is heated by the heating film to reach a proper temperature, so that the performance of the battery pack is prevented from being reduced, and the normal operation of the battery pack is maintained.

However, in the related art, the battery pack swells when the temperature rises, and the heating film attached to the surface of the battery pack is easily damaged or peeled off by the swelling of the battery pack.

Disclosure of Invention

The embodiment of the application provides a battery package and vehicle, and the edge of the heating film of battery package has the convex part, through the tension that the convex part dispersion heating film received, avoids heating film to damage or drop.

The embodiment of the application provides a battery pack, including casing and electric core module, electric core module set up in the casing, electric core module includes fixed frame and sets up group battery in the fixed frame, be provided with the heating film on at least one lateral wall of group battery, wherein:

the battery pack comprises a plurality of battery monomers arranged in the fixed frame, and the battery monomers are sequentially arranged along a first direction;

the edge of the heating film is provided with a plurality of convex parts which are sequentially arranged along the first direction.

When the battery pack expands due to a temperature rise, the battery pack expands in a first direction to a large extent because the plurality of battery cells are arranged in the first direction. The plurality of projections are arranged in order in the first direction, corresponding to an extension of the length of the edge. Thus, when the heating film is subjected to the tension applied by the battery pack, the tension applied to the edge of the heating film is dispersed to the convex portions, the tension applied to the edge per unit length is reduced, and accordingly, the deformation amount of the edge per unit length is reduced, so that the edge of the heating film is prevented from cracking or warping, and the heating film is prevented from being damaged or falling off.

In one possible implementation, the present examples provide a battery pack, the convex part including a first convex part and a second convex part;

the first convex parts are arranged at the first edge of the heating film, and the second convex parts are arranged at the second edge of the heating film;

the first edge and the second edge are located at opposite ends of the heating film.

The plurality of first protrusions are sequentially arranged along the first direction, which corresponds to extension of the length of the first edge, and the plurality of second protrusions are sequentially arranged along the first direction, which corresponds to extension of the length of the second edge. Thus, when the heating film is subjected to the tension applied by the battery pack, the tension applied to the first edge and the second edge of the heating film can be dispersed to the first convex part and the second convex part, so that the tension applied to the first edge and the second edge of the unit length is reduced, and accordingly, the deformation amount of the first edge and the second edge of the unit length is reduced, the first edge and the second edge of the heating film are prevented from cracking or warping, and the heating film is prevented from being damaged or falling off.

In a possible implementation manner, the present application provides a battery pack, wherein a first edge of the heating film has a plurality of first concave portions, the plurality of first concave portions are sequentially arranged along the first direction, and one first concave portion is disposed between two adjacent first convex portions;

the second edge of the heating film is provided with a plurality of second concave parts which are sequentially arranged along the first direction, and one second concave part is arranged between two adjacent second convex parts.

The plurality of first concave parts are sequentially arranged along the first direction, and the length of the first edge is further prolonged; the plurality of second recesses are arranged in sequence along the first direction, which corresponds to further extending the length of the second edge. And, two adjacent first convex parts are provided with one first concave part between them, and two adjacent second convex parts are provided with one second concave part between them, so that the tension received between two adjacent first convex parts and the tension received between two adjacent second convex parts are dispersed. The deformation of the first edge and the second edge of the unit length can be further reduced, so that the first edge and the second edge of the heating film are prevented from cracking or warping, and the heating film is prevented from being damaged or falling off.

In one possible implementation, the present examples provide a battery pack, and the first convex portion, the second convex portion, the first concave portion, and the second concave portion are all arc-shaped;

the plurality of first convex parts and the plurality of first concave parts form a continuous wave shape, and the plurality of second convex parts and the plurality of second concave parts form a continuous wave shape.

The first convex part, the second convex part, the first concave part and the second concave part which are arc-shaped enable the first edge and the second edge of the heating film to form smooth wave shapes. When the heating film is under tension, the wavy edge can avoid stress concentration on a certain area of the edge, so that the first edge and the second edge are prevented from cracking or warping, and the heating film is prevented from being damaged or falling off.

In a possible implementation manner, the present embodiment provides a battery pack, wherein the first protruding portion is located between two adjacent battery cells, and the second protruding portion is located between two adjacent battery cells.

Because the battery monomer can outwards release heat at the during operation, the free temperature of event battery will be higher than the regional temperature between two adjacent battery monomers, so for the group battery, the free required outside heating volume of battery will be less than the regional required outside heating volume between two adjacent battery monomers, event first convex part, second convex part are located between two adjacent battery monomers, have strengthened the heating in the region between two adjacent battery monomers in other words, make the holistic temperature of group battery more even.

In a possible implementation manner, an embodiment of the present application provides a battery pack, where a plurality of through holes are formed in the heating film, the through holes are sequentially arranged along the first direction, and the through holes are located between two adjacent battery cells;

the through holes are strip-shaped holes, the strip-shaped holes extend along a second direction, and the second direction is perpendicular to the first direction.

When the battery pack expands due to temperature rise, the deformation of the area between two adjacent battery cells of the heating film is larger because the area is not connected with the battery cells, the through hole in the area can enable the tension applied to the area to be transmitted to the edge of the through hole, and the heating film is adaptive to the expansion of the battery pack through the deformation of the through hole so as to prevent the heating film from cracking.

In a possible implementation manner, an embodiment of the present application provides a battery pack, where the through holes include first through holes and second through holes, the first through holes are close to the first edge, the second through holes are close to the second edge, and the first through holes and the second through holes are staggered along the first direction.

The first through holes are close to the first edge, the second through holes are close to the second edge, and the first through holes and the second through holes are arranged in a staggered mode, so that the deformation of the heating film close to one side of the first edge and the deformation of the heating film close to one side of the second edge are relatively balanced, and the heating film is prevented from being torn due to stress concentration in an area close to one side edge.

In one possible implementation, the embodiment of the present application provides a battery pack, where the casing includes a bottom case and an upper cover, and the upper cover is connected to the bottom case;

a gel layer is arranged on the inner bottom surface of the bottom shell, and the bottom surface of the battery cell module is connected with the gel layer;

the internal perisporium of drain pan is equipped with the insulating layer, the internal perisporium of upper cover is equipped with the cotton layer of heat preservation.

In one possible implementation, the present embodiments provide a battery pack, further comprising a monitoring device and a gas sensor;

the monitoring device is arranged on the shell and is electrically connected with the battery cell module;

the gas sensor is arranged in the shell and electrically connected with the monitoring device.

The embodiment of the application provides a vehicle, the vehicle at least includes any above-mentioned battery package.

According to the vehicle of the embodiment of the application, the convex parts are arranged on the edges of the heating film of the battery pack, when the battery pack expands due to temperature rise, the convex parts can disperse tension on the heating film, and the heating film is prevented from being damaged or falling off, so that the fault occurrence rate of the vehicle is reduced, and the reliability of the vehicle is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;

fig. 2 is an exploded schematic view of a battery pack provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a battery cell module in a battery pack provided in an embodiment of the present application;

fig. 4 is an exploded schematic view of a cell module in a battery pack provided in an embodiment of the present application;

fig. 5 is a schematic structural view of a heating film in a battery pack according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram illustrating connection between a battery pack and a heating film in a battery pack according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a bottom case of a battery pack according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an upper cover in a battery pack according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a sealing gasket in a battery pack according to an embodiment of the present application.

Description of reference numerals:

10-a housing; 11-a bottom shell;

111-a first flange; 112-a first connection hole;

12-upper cover; 121-a second flanging;

122-second connection hole; 123-heat dissipation lines;

13-a gasket; 131-a third connection hole;

20-cell module; 21-a fixed frame;

22-a battery pack; 221-battery cell;

30-heating the film; 31-a first edge;

311-a first convex part; 312 — a first recess;

32-a second edge; 321-a second projection;

322-a second recess; 33-a first via;

34-a second through hole; 40-a gel layer;

50-an insulating layer; 60-heat preservation cotton layer;

70-monitoring device.

Detailed Description

In the related art, since the heating film is attached to the surface of the battery pack, the battery pack may apply tension to the heating film attached to the surface thereof when the battery pack swells, so that the edge of the heating film is cracked or warped, and the heating film is damaged or falls off.

In view of this, embodiments of the present disclosure provide a battery pack, in which a convex portion is disposed on a heating film of the battery pack, and the convex portion disperses tension applied to the heating film to prevent the heating film from being damaged or falling off.

In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example one

Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application; fig. 2 is an exploded schematic view of a battery pack provided in an embodiment of the present application; fig. 3 is a schematic structural diagram of a battery cell module in a battery pack provided in an embodiment of the present application; fig. 4 is an exploded schematic view of a cell module in a battery pack provided in an embodiment of the present application; fig. 5 is a schematic structural view of a heating film in a battery pack according to an embodiment of the present disclosure; fig. 6 is a schematic diagram illustrating connection between a battery pack and a heating film in a battery pack according to an embodiment of the present application.

Referring to fig. 1 to 6, an embodiment of the present application provides a battery pack, which includes a casing 10 and a battery cell module 20, where the battery cell module 20 is disposed in the casing 10.

The casing 10 is an outer shell of the battery pack, the inside of the casing 10 is used for placing the battery pack 22, and the casing 10 plays a role in sealing, protecting the battery pack 22 and preserving heat of the battery pack 22.

The battery cell module 20 is an electric storage device of a battery pack and is used for storing electric energy and releasing electric energy. The battery cell module 20 includes a fixing frame 21 and a battery pack 22 mounted in the fixing frame 21. The battery pack 22 includes a plurality of battery cells 221, and the plurality of battery cells 221 are mounted in a fixed frame in a first direction.

The heating film 30 is a heating device of the battery pack for heating the battery pack 22. The heating film 30 is attached to the surface of the battery pack 22, and the battery pack 22 is maintained at a proper temperature by heating.

The edge of the heating film 30 has a plurality of convex portions, and the plurality of convex portions are arranged in order in the first direction. The convex portion includes a first convex portion 311 and a second convex portion 321. The first edge 31 of the heating film 30 has a plurality of first convex portions 311, and the plurality of first convex portions 311 are sequentially arranged in a first direction; the second edge 32 of the heating film 30 has a plurality of second protrusions 321, the plurality of second protrusions 321 are sequentially arranged along the first direction, and the first edge 31 and the second edge 32 are located at upper and lower ends of the heating film 30.

When the battery pack 22 expands due to a temperature rise, the battery pack 22 expands in the first direction to a large extent because the plurality of battery cells 221 are arranged in the first direction. The plurality of first protrusions 311 are sequentially arranged in the first direction, corresponding to an extension of the length of the first edge 31; the plurality of second protrusions 321 are sequentially arranged in the first direction, which is equivalent to extending the length of the second edge 32. Thus, when the heating film 30 receives the tension applied by the battery pack 22, the tension applied to the first edge 31 and the second edge 32 of the heating film 30 is dispersed to the first protrusion 311 and the second protrusion 321, the tension applied to the first edge 31 and the second edge 32 per unit length is reduced, and accordingly, the deformation amount of the first edge 31 and the second edge 32 per unit length is reduced, so that the first edge 31 and the second edge 32 of the heating film 30 are prevented from being cracked or warped, and the heating film 30 is prevented from being damaged or falling off.

Specifically, the heating Film 30 is a Polyimide heating Film 30 (PI Film). The polyimide has excellent high temperature resistance and low temperature resistance, and can adapt to a larger temperature range.

Fig. 7 is a schematic structural diagram of a bottom case of a battery pack according to an embodiment of the present disclosure; fig. 8 is a schematic structural diagram of an upper cover in a battery pack according to an embodiment of the present disclosure; fig. 9 is a schematic structural diagram of a sealing gasket in a battery pack according to an embodiment of the present application.

Referring to fig. 2 and 7-9, in the embodiment of the present application, the housing 10 includes a bottom case 11 and an upper cover 12, and the upper cover 12 is connected to the bottom case 11.

Specifically, the outer peripheral wall of the bottom housing 11 has a first flange 111, the first flange 111 is provided with a plurality of first connection holes 112, and the first connection holes 112 surround the peripheral side of the bottom housing 11. The outer peripheral wall of the upper cover 12 has a second flange 121, the second flange 121 is provided with a plurality of second connecting holes 122, and the second connecting holes 122 surround the peripheral side of the bottom case 11. When connecting bottom shell 11 to bottom shell 11, align first connecting hole 112 on first flange 111 with second connecting hole 122 on second flange 121 one by one, and insert the bolt into aligned first connecting hole 112 and second connecting hole 122, connect the nut to the bolt again, and connect upper cover 12 and bottom shell 11 through the fastening force of bolt and nut.

Referring to fig. 8, in the embodiment of the present application, the top surface of the upper cover 12 is provided with heat dissipation patterns 123, and the heat dissipation patterns 123 can enhance the heat dissipation of the battery pack and prevent the temperature in the battery pack from being too high.

Specifically, the heat dissipation pattern 123 is formed by a protrusion on the top surface of the upper cover 12, and the shape of the heat dissipation pattern 123 includes a hexagon, a triangle, or a trapezoid.

Referring to fig. 2 and 9, in the embodiment of the present application, a gasket 13 is disposed between the first flange 111 and the second flange 121, the gasket 13 is annular, and a third connection hole 131 corresponding to the first connection hole 112 and the second connection hole 122 is disposed on the gasket 13. The gasket 13 is clamped between the first flange 111 and the second flange 121 to seal a gap between the first flange 111 and the second flange 121, thereby improving the waterproof performance of the housing 10.

Referring to fig. 2, in the embodiment of the present application, a gel layer 40 is disposed on an inner bottom surface of the bottom case 11, and a bottom surface of the battery cell module 20 is connected to the gel layer 40 for fixing. In the correlation technique, often adopt the structure to glue and fix electric core module 20 in casing 10, when maintaining the battery package, some trouble of battery package may only need to change certain spare part or certain electric core module 20, but because the viscidity that the structure glued is stronger, is difficult to dismantle electric core module 20 alone, and can only change the battery package is whole, and the maintenance cost is higher. And the viscidity of gel is lower relative to the structural adhesive, can realize dismantling alone of certain electric core module 20, reduces the maintenance cost.

Specifically, the gel layer 40 is a thermally conductive silicone pad. Like this, when the vehicle that carries the battery package takes place to jolt, the heat conduction silica gel pad can the vehicle absorb the energy of jolt production, forms the buffering between electric core module 20 and drain pan 11, plays the effect of protection electric core module 20. In addition, the heat-conducting silica gel pad also has a heat-conducting function, and can release heat generated by the battery pack 22 to the bottom case 11, so that the battery pack 22 is prevented from being over-heated, and the battery pack 22 is maintained at a proper temperature.

Referring to fig. 2, in the embodiment of the present invention, an insulating layer 50 is disposed on an inner peripheral wall of the bottom case 11. Insulating layer 50 encircles in battery core module 20's week side, plays insulating effect, can avoid battery core module 20 electric leakage.

Referring to fig. 2, in the embodiment of the present application, the inner peripheral wall of the upper cover 12 is provided with an insulating cotton layer 60. The insulating cotton layer 60 surrounds the periphery of the battery cell module 20, and can play a role in heat insulation, so that the battery pack 22 is maintained at a proper temperature.

Referring to fig. 2, in the embodiment of the present application, the battery pack further includes a monitoring device 70 and a gas sensor (not shown), the monitoring device 70 is disposed on the casing 10 and electrically connected to the cell module 20, and the gas sensor is disposed in the casing 10 and electrically connected to the monitoring device 70. The gas sensor can monitor harmful gases such as carbon dioxide gas, carbon monoxide gas and oxynitride gas in the shell 10, when the concentration of the harmful gases in the shell 10 is detected to be abnormal, signals are fed back to the monitoring device 70 in time, and an alarm is given out through the monitoring device 70, so that a vehicle user can find abnormal conditions in the battery pack in time, and the safety of the vehicle user is ensured.

Specifically, the monitoring device 70 is a Battery Management System (BMS). The battery management system can acquire the voltage and temperature, the charging and discharging current and the total voltage of the battery pack of each battery cell 221 in real time, and prevent the overcharge or overdischarge of the battery cells 221. Meanwhile, the battery condition can be timely given, and the reliability and the high efficiency of the operation of the battery cell module 20 are kept.

Referring to fig. 5 and 6, in the embodiment of the present application, the first edge 31 of the heating film 30 has a plurality of first concave portions 312, the plurality of first concave portions 312 are sequentially arranged along the first direction, and one first concave portion 312 is disposed between two adjacent first convex portions 311. The second edge 32 of the heating film 30 has a plurality of second concave portions 322, the plurality of second concave portions 322 are sequentially arranged along the first direction, and one second concave portion 322 is disposed between two adjacent second convex portions 321.

The plurality of first recesses 312 are sequentially arranged in the first direction, corresponding to further extending the length of the first edge 31; the plurality of second recesses 322 are sequentially arranged along the first direction, corresponding to further extending the length of the second edge 32. One first concave portion 312 is provided between two adjacent first convex portions 311, and one second concave portion 322 is provided between two adjacent second convex portions 321, so that the tension received between two adjacent first convex portions 311 and the tension received between two adjacent second convex portions 321 are dispersed. The deformation amount of the first edge 31 and the second edge 32 per unit length can be further reduced, so that the first edge 31 and the second edge 32 of the heating film 30 are prevented from cracking or warping, and the heating film 30 is prevented from being damaged or falling off.

In addition, one first concave part 312 is arranged between two adjacent first convex parts 311, so that the first convex parts 311 and the first concave parts 312 on the first edge 31 are more uniformly distributed, and the tension applied to the first edge 31 is more uniformly distributed. A second concave portion 322 is disposed between two adjacent second convex portions 321, so that the second convex portions 321 and the second concave portions 322 on the second edge 32 are more uniformly distributed, and the tension applied to the second edge 32 is more uniformly distributed.

Referring to fig. 5 and 6, in the embodiment of the present application, the first convex portion 311, the second convex portion 321, the first concave portion 312, and the second concave portion 322 are all arc-shaped. The first protrusions 311 and the first recesses 312 form a continuous wave shape, and the second protrusions 321 and the second recesses 322 form a continuous wave shape.

The first convex portion 311, the second convex portion 321, the first concave portion 312, and the second concave portion 322 having the arc shape form the first edge 31 and the second edge 32 of the heating film 30 into a smooth wave shape. When the heating film 30 is under tension, the wavy edge can avoid stress concentration on a certain region of the edge, thereby avoiding cracking or warping of the first edge 31 and the second edge 32, and preventing the heating film 30 from being damaged or falling off.

Referring to fig. 5 and 6, in the embodiment of the present application, the first protruding portion 311 is located between two adjacent battery cells 221, and the second protruding portion 321 is located between two adjacent battery cells 221.

Since the battery cells 221 release heat outward during operation, the temperature of the battery cells 221 is higher than the temperature of the region between two adjacent battery cells 221, and therefore, for the battery pack 22, the amount of external heating required by the battery cells 221 is less than the amount of external heating required by the region between two adjacent battery cells 221, and therefore, the first protruding portion 311 and the second protruding portion 321 are located between two adjacent battery cells 221, which is equivalent to strengthening heating of the region between two adjacent battery cells 221, so that the temperature of the whole battery pack 22 is more uniform.

Referring to fig. 5 and 6, in the embodiment of the present invention, a plurality of through holes are formed in the heating film 30, and the through holes are sequentially arranged along the first direction and located between two adjacent battery cells 221.

When the battery pack 22 expands due to temperature rise, the deformation amount of the region between two adjacent battery cells 221 of the heating film 30 is relatively larger because the region is not connected with the battery cells 221, the through hole in the region enables the tension applied to the region to be transmitted to the edge of the through hole, and the heating film 30 is adapted to the expansion of the battery pack 22 through the deformation of the through hole, so as to prevent the heating film 30 from cracking.

Specifically, the through holes are strip-shaped holes, the strip-shaped holes extend along a second direction, and the second direction is perpendicular to the first direction. The two ends of the strip-shaped hole are arc-shaped, so that the edge of the strip-shaped hole is smoother, the tension can be prevented from being concentrated in a certain area of the edge of the through hole, and the strip-shaped hole is prevented from being torn.

Referring to fig. 5 and 6, in the embodiment of the present application, the through holes include a first through hole 33 and a second through hole 34, the first through hole 33 is close to the first edge 31, the second through hole 34 is close to the second edge 32, and the first through hole 33 and the second through hole 34 are staggered in the first direction.

By arranging the first through holes 33 close to the first edge 31 and the second through holes 34 close to the second edge 32, and arranging the first through holes 33 and the second through holes 34 in a staggered manner, the deformation of the heating film 30 close to the first edge 31 is relatively balanced with the deformation of the heating film close to the second edge 32, and the heating film 30 is prevented from being torn due to stress concentration in an area close to one edge.

Example two

The embodiment of the application provides a vehicle, and the vehicle at least comprises the battery pack in the first embodiment.

Referring to fig. 5 and 6, in the vehicle according to the embodiment of the present application, the heating film 30 of the battery pack has the first protrusion 311 and the second protrusion 321, and when the battery pack 22 expands due to a temperature rise, the first protrusion 311 and the second protrusion 321 can disperse the tension applied to the heating film 30, thereby preventing the heating film 30 from being damaged or falling off, reducing the failure rate of the vehicle, and improving the reliability of the vehicle.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.