CN210468041U

CN210468041U - Battery module, battery pack and vehicle

Info

Publication number: CN210468041U
Application number: CN201921597414.1U
Authority: CN
Inventors: 梁士杰
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-05-05
Anticipated expiration: 2029-09-24

Abstract

The utility model relates to a battery module, battery package and vehicle. The battery module includes: a battery unit including two or more secondary batteries arranged side by side; the secondary battery has a top surface; a heating film extending in an arrangement direction of the secondary batteries, the heating film being connected to a top surface of the secondary batteries, the heating film being for heating the secondary batteries; the sampling circuit board, the range upon range of setting of sampling circuit board and heating film, the sampling circuit board sets up in the one side that the top surface was kept away from to the heating film. The utility model discloses battery module can carry out the heat pipe reason to secondary battery to the realization is guaranteed secondary battery work and is in suitable temperature, keep secondary battery's temperature equilibrium, eliminates potential danger.

Description

Battery module, battery pack and vehicle

Technical Field

The utility model relates to a battery technology field especially relates to a battery module, battery package and vehicle.

Background

At present, with the rapid development of the new energy automobile industry, the safety of the new energy automobile industry is more and more valued by people. Since the secondary battery is a main component of the new energy automobile, improving the safety of the secondary battery is an important measure for improving the safety of the new energy automobile. The temperature of the secondary battery is an important factor affecting the performance and safety of the secondary battery. Specifically, when the battery temperature is too low, the internal resistance and polarization voltage of the secondary battery increase, which is manifested by a decrease in the available capacity and a decrease in the energy utilization efficiency of the secondary battery, and affects the performance, safety, life, and the like of the secondary battery.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a battery module, battery package and vehicle. The battery module can carry out the heat management to secondary battery to the realization guarantees that secondary battery work is in suitable temperature, keeps secondary battery's temperature balanced, eliminates potential danger.

On the one hand, the embodiment of the utility model provides a battery module is provided, it includes:

a battery unit including two or more secondary batteries arranged side by side; the secondary battery has a top surface; a heating film extending in an arrangement direction of the secondary batteries, the heating film being connected to a top surface of the secondary batteries, the heating film being for heating the secondary batteries; the sampling circuit board, the range upon range of setting of sampling circuit board and heating film, the sampling circuit board sets up in the one side that the top surface was kept away from to the heating film.

According to the utility model discloses an aspect, battery module still includes first bonding part, and the heating film passes through first bonding part adhesive connection with the top surface, and/or, battery module still includes the second bonding part, and the heating film passes through second bonding part adhesive connection with the sampling circuit board.

According to the utility model discloses an aspect, at least one of heating film and sampling circuit board has hot melt portion, and heating film and sampling circuit board pass through hot melt portion hot melt and connect.

According to an aspect of an embodiment of the present invention, the secondary battery includes an explosion-proof valve disposed at a top surface, and the heating film has a first relief hole corresponding to a position of the explosion-proof valve; or,

the heating film has a first score arranged around the explosion-proof valve, or the heating film has more than two first scores arranged around the explosion-proof valve at intervals.

According to an aspect of an embodiment of the present invention, the secondary battery includes an explosion-proof valve disposed on the top surface, and the sampling circuit board has a second relief hole corresponding to the position of the explosion-proof valve; or,

the sampling circuit board is provided with a second nick arranged around the explosion-proof valve, or the sampling circuit board is provided with more than two second nicks which are arranged around the explosion-proof valve at intervals.

According to the utility model discloses in one aspect of the embodiment, secondary battery has positive terminal and the negative terminal that the interval set up, and positive terminal and negative terminal all bulge the top surface, and the heating film sets up between positive terminal and negative terminal.

According to the utility model discloses an aspect, the battery module still includes thermal-insulated membrane, sets up thermal-insulated membrane between sampling circuit board and the heating film, and along the thickness direction of heating film, the projected area of thermal-insulated membrane is greater than the projected area of heating film.

According to an aspect of the embodiment of the present invention, the secondary battery includes an explosion-proof valve provided on the top surface, and the heat insulating film has a third relief hole corresponding to the position of the explosion-proof valve.

According to the utility model discloses an aspect, battery module still includes flexible conducting strip, and the heating film passes through flexible conducting strip and is connected with the top surface.

According to the utility model discloses battery module includes battery cell and carries out the heating membrane that heats to battery cell. When the battery unit is in an environment lower than the normal operating temperature, the heating film can heat the battery unit so as to heat the battery unit to the normal operating temperature, thereby ensuring the stable performance of the secondary battery in the battery unit and reducing the possibility of reduction of the available capacity and the energy utilization efficiency of the secondary battery.

In another aspect, an embodiment of the present invention provides a battery pack, which includes the battery module according to the above embodiment.

In another aspect, an embodiment of the present invention provides a vehicle, including: a power source for providing a driving force for a vehicle; the battery pack according to the above embodiment configured to supply electric power to the power source.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is an exploded schematic view of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of a battery module according to an embodiment of the present invention;

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

fig. 5 is a schematic structural view of a heating film according to another embodiment of the present invention;

FIG. 6 is an enlarged view at A in FIG. 5;

fig. 7 is a schematic view of a partial structure of a heating film according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a sampling circuit board according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a sampling circuit board according to another embodiment of the present invention;

FIG. 10 is an enlarged view at B in FIG. 9;

fig. 11 is a schematic partial structure diagram of a sampling circuit board according to an embodiment of the present invention;

fig. 12 is an exploded schematic view of a battery module according to another embodiment of the present invention;

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

fig. 14 is an exploded view of a battery module according to another embodiment of the present invention;

fig. 15 is a schematic structural view of a heat insulating film according to an embodiment of the present invention;

fig. 16 is an exploded view of a battery module according to still another embodiment of the present invention;

fig. 17 is a schematic structural view of a flexible heat-conducting sheet according to an embodiment of the present invention.

In the drawings, the drawings are not necessarily to scale.

Description of the labeling:

10. a battery pack;

20. a battery module; 20a, a battery cell; 21. a secondary battery; 21a, a top surface; 21b, an explosion-proof valve; 21c, a positive electrode terminal; 21d, a negative electrode terminal;

30. heating the film; 30a, a first yielding hole; 30b, a first score;

40. sampling the circuit board; 40a, a second abdicating hole; 40b, a second score; 41. opening a hole;

50. a first adhesive member;

60. a second adhesive member;

70. a heat-melting section;

80. a heat insulating film; 80a and a third abdicating hole;

90. a flexible thermally conductive sheet; 90a and a fourth abdicating hole;

100. connecting sheets;

x, arrangement direction.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the referenced devices or elements 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 the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For a better understanding of the present invention, embodiments of the present invention are described below with reference to fig. 1 to 17.

Referring to fig. 1, an embodiment of the present invention provides a battery pack 10. The battery pack 10 includes an upper case, a lower case, and a plurality of battery modules 20. The upper case and the lower case are fastened to form a receiving space in which the battery module 20 is received.

Referring to fig. 2 and 3, a battery module 20 according to an embodiment of the present invention includes a battery cell 20a, a heating film 30, and a sampling circuit board 40. The battery unit 20a includes two or more secondary batteries 21 arranged side by side. The secondary battery 21 is a prismatic battery having narrow side faces, wide side faces, a bottom face, and a top face 21 a. The wide side surfaces of two adjacent secondary batteries 21 are disposed opposite to each other. The heating film 30 extends in the arrangement direction of the secondary batteries 21. The heating film 30 is connected to the top surface 21a of the secondary battery 21 for heating the secondary battery 21. In one example, the heating film 30 is connected to the top surfaces 21a of all the secondary batteries 21 to enable heating of each secondary battery 21, improving heating efficiency. Alternatively, the heating film 30 may be adhered to the top surface 21a of the secondary battery 21, or may be fixed to the top surface 21a of the secondary battery 21 by a connector, or may be attached to only the top surface 21a of the secondary battery 21 by contact bonding. In one example, the heating film 30 has an insulating protective layer, a resistance heating wire disposed within the insulating protective layer, and a power interface connected to the resistance heating wire. Two adjacent secondary batteries 21 are connected in series or in parallel by a connecting piece 100. The sampling circuit board 40 is connected to the connection sheet 100, and is used for collecting signals such as the voltage of the secondary battery 21. After the sampling circuit board 40 is connected and fixed to the connecting sheet 100, the sampling circuit board 40 may apply a downward pressure to the heating film 30 to restrain the heating film 30. The sampling circuit board 40 is laminated with the heating film 30. Here, the lamination arrangement refers to a positional relationship of the sampling circuit board 40 and the heating film 30 with each other, and the sampling circuit board 40 and the heating film 30 may be in direct contact, may be arranged at an interval, or may have another structural member arranged therebetween. The sampling circuit board 40 is disposed on a side of the heating film 30 away from the top surface 21 a. The sampling circuit board 40 may be a flexible circuit board.

The battery module 20 of the embodiment of the present invention includes a battery cell 20a and a heating film 30 that heats the battery cell 20 a. When the battery cell 20a is in an environment lower than the normal operating temperature, the heating film 30 can heat the battery cell 20a to raise the temperature of the battery cell 20a to the normal operating temperature, ensure stable performance of the secondary battery 21 in the battery cell 20a, and reduce the possibility of reduction in the available capacity of the secondary battery 21 and reduction in the energy use efficiency. In addition, since the heating film 30 is disposed on the top surface 21a side of the battery cell 20a, the heating film 30 does not fall off and dry-fire occurs during the use of the battery module 20, thereby reducing the possibility of local over-temperature caused by dry-fire and improving the safety of the use of the heating film 30. Furthermore, the heating film 30 and the sampling circuit board 40 are stacked, so that the heating film 30 is limited by the sampling circuit board 40, the possibility that the heating film 30 is separated from the top surface 21a of the secondary battery 21 due to the position deviation is reduced, and the possibility that the heating film 30 and the secondary battery 21 rub against each other to cause abrasion is also reduced.

The secondary battery 21 has a positive electrode terminal 21c and a negative electrode terminal 21d provided at an interval. The positive terminal 21c and the negative terminal 21d each protrude from the top surface 21 a. The positive electrode terminals 21c and the negative electrode terminals 21d of all the secondary batteries 21 form two rows of terminal groups. The terminals in each column of terminal groups are arranged along the arrangement direction. The heating film 30 is provided between the positive electrode terminal 21c and the negative electrode terminal 21 d.

Referring to fig. 4, the secondary battery 21 includes an explosion-proof valve 21b provided on a top surface 21 a. The heating film 30 has a first relief hole 30a corresponding to the position of the explosion-proof valve 21 b. The first escape hole 30a penetrates the heating film 30 in the thickness direction of the heating film 30. Therefore, on one hand, when the explosion valve 21b is exploded, the high-temperature substance can smoothly pass through the first abdicating hole 30a, so that the possibility that the explosion valve 21b cannot normally work due to the high-temperature substance blocked by the heating film 30 is reduced, and the safety of the secondary battery 21 is improved; on the other hand, since the secondary battery 21 has the protective film disposed outside the explosion-proof valve 21b and spaced apart from the explosion-proof valve 21b, the heating film 30 of the present embodiment does not directly heat the protective film, and thus the possibility of structural damage of the protective film itself due to excessive temperature rise is reduced. In one example, the size of the first relief hole 30a is larger than the size of the explosion-proof valve 21 b.

Referring to fig. 5 and 6, the secondary battery 21 includes an explosion-proof valve 21b provided on a top surface 21 a. The heating film 30 has two or more first scores 30b provided around the explosion-proof valve 21 b. The two or more first scores 30b are uniformly distributed along the circumferential direction of the explosion-proof valve 21 b. The thickness of the region of the heating film 30 where the first score 30b is formed is smaller than the thickness of the other regions. The heating film 30 has a connection region between adjacent two first scores 30 b. In one example, the first scores 30b may be through-hole structures penetrating the heating film 30 in a thickness direction of the heating film 30. When the explosion-proof valve 21b is exploded, the connection area on the heating film 30 is broken by the instant impact force, thereby forming a through-hole in the heating film 30. Alternatively, the first scores 30b may be blind hole structures that do not penetrate the heating film 30 in the thickness direction of the heating film 30. When the explosion valve 21b is exploded, the portion of the heating film 30 corresponding to the first notch 30b and the connection region are broken by the instant impact force, thereby forming a through hole in the heating film 30. Thus, the high-temperature substance can smoothly pass through the through hole, the possibility that the explosion-proof valve 21b cannot normally operate due to the blocking of the high-temperature substance by the heating film 30 is reduced, and the safety of the secondary battery 21 is improved.

Referring to fig. 7, the heating film 30 has a first notch 30b provided around the explosion-proof valve 21 b. The first scores 30b are blind hole structures that do not penetrate the heating film 30. When the explosion valve 21b is exploded, a portion of the heating film 30 corresponding to the first notch 30b is broken by an instantaneous impact force, thereby forming a through hole in the heating film 30. Thus, the high-temperature substance can smoothly pass through the through hole, the possibility that the explosion-proof valve 21b cannot normally operate due to the blocking of the high-temperature substance by the heating film 30 is reduced, and the safety of the secondary battery 21 is improved.

Referring to fig. 8, the sampling circuit board 40 has a second escape hole 40a corresponding to the position of the explosion-proof valve 21 b. The second escape hole 40a penetrates the sampling circuit board 40 in the thickness direction of the heating film 30. Therefore, on one hand, when the explosion-proof valve 21b is exploded, the high-temperature substance can smoothly pass through the second abdicating hole 40a, the possibility that the sampling circuit board 40 blocks the high-temperature substance to cause the explosion-proof valve 21b to be incapable of working normally is reduced, and the safety of the secondary battery 21 is improved. In one example, the size of the second relief hole 40a is larger than the size of the explosion-proof valve 21 b.

Referring to fig. 9 and 10, the sampling circuit board 40 has two or more second notches 40b provided around the explosion-proof valve 21 b. The two or more second scores 40b are uniformly distributed along the circumferential direction of the explosion-proof valve 21 b. The thickness of the area of the sampling circuit board 40 where the second notch 40b is formed is smaller than the thickness of the other areas. The sampling circuit board 40 has a connection region between adjacent two second scores 40 b. In one example, the second notch 40b may be a through hole structure penetrating the sampling circuit board 40 in a thickness direction of the sampling circuit board 40. When the explosion-proof valve 21b is exploded, the connection area on the sampling circuit board 40 is broken by the instantaneous impact force, so that a through hole is formed on the sampling circuit board 40. Alternatively, the second notch 40b may be a blind hole structure that does not penetrate the sampling circuit board 40 in the thickness direction of the sampling circuit board 40. When the explosion-proof valve 21b is exploded, the portion of the sampling circuit board 40 corresponding to the second notch 40b and the connection area are broken by the instant impact force, so that a through hole is formed in the sampling circuit board 40. Thus, the high-temperature substance can smoothly pass through the through hole, the possibility that the explosion-proof valve 21b cannot normally work due to the blocking of the high-temperature substance by the sampling circuit board 40 is reduced, and the safety of the secondary battery 21 is improved.

Referring to fig. 11, the sampling circuit board 40 has a second notch 40b surrounding the explosion-proof valve 21 b. The second notch 40b is a blind hole structure that does not penetrate the sampling circuit board 40. When the explosion valve 21b is exploded, a portion of the sampling circuit board 40 corresponding to the second notch 40b is broken by an instantaneous impact force, thereby forming a through hole in the sampling circuit board 40. Thus, the high-temperature substance can smoothly pass through the through hole, the possibility that the explosion-proof valve 21b cannot normally work due to the blocking of the high-temperature substance by the sampling circuit board 40 is reduced, and the safety of the secondary battery 21 is improved.

Referring to fig. 12, the battery module 20 further includes a first adhesive member 50. The heating film 30 is adhesively connected to the top surface 21a of the secondary battery 21 by the first adhesive member 50, thereby improving the connection stability between the heating film 30 and the top surface 21a of the secondary battery 21, and the first adhesive member 50 can be closely attached to the top surface 21a, thereby improving the heat transfer efficiency and reducing the possibility of heat conduction loss or attenuation due to a gap between the heating film 30 and the top surface 21 a. In one example, the first adhesive member 50 may be a double-sided tape or an adhesive tape layer.

The battery module 20 further includes a second adhesive member 60. The heating film 30 and the sampling circuit board 40 are adhesively connected by the second adhesive member 60, so that the connection stability of the heating film 30 and the sampling circuit board 40 is improved, and the possibility of the mutual position displacement of the heating film 30 and the sampling circuit board 40 is reduced. In one example, the second adhesive member 60 may be a double-sided tape or an adhesive tape layer.

Referring to fig. 13, the heating film 30 has a heat fusion part 70 thereon. The heating film 30 and the circuit board are thermally fused by the thermal fusion part 70. In one example, the heating film 30 has a columnar heat fusion part 70 thereon, and the sampling circuit board 40 is provided with an opening 41 thereon. The heat fusion part 70 on the heating film 30 is inserted into the opening 41 of the sampling circuit board 40 in advance, and then the heat fusion part 70 is melted by the heat fusion device so that a part of the heat fusion part 70 extends to the region outside the opening 41 to cover the opening 41 and not to come out from the opening 41, thereby fixedly connecting the heating film 30 and the sampling circuit board 40. In another example, the sampling circuit board 40 has a columnar thermal fusion part 70, and the heating film 30 is provided with an opening 41, so that the heating film 30 and the sampling circuit board 40 can be connected and fixed.

Referring to fig. 14, the battery module 20 further includes a heat insulating film 80. A heat insulating film 80 is provided between the sampling circuit board 40 and the heating film 30. The heat insulation film 80 can prevent the heat released by the heating film 30 from being transferred to the sampling circuit board 40, and reduce the possibility of structural damage caused by temperature rise due to excessive heat absorption of the sampling circuit board 40. In addition, the heat released from the heating film 30 is blocked by the heat insulating film 80, so that heat loss can be reduced, and most of the heat is absorbed by the secondary battery 21 more, which is advantageous for improving the heating efficiency of the heating film 30. In one example, a projected area of the heat insulation film 80 is larger than a projected area of the heating film 30 in a thickness direction of the heating film 30, so that the heat insulation film 80 covers the heating film 30. Alternatively, the heat insulating film 80 may be a film covered with an aluminum foil. Alternatively, the heat insulating film 80 may be a sheet structure including heat insulating materials such as glass fiber, asbestos, and the like. In one example, referring to fig. 15, the heat insulating film 80 has a third relief hole 80a corresponding to the position of the explosion proof valve 21 b. The third relief hole 80a penetrates the heat insulating film 80 in the thickness direction of the heat insulating film 80. In this way, on the one hand, when the explosion valve 21b is exploded, the high-temperature substance can smoothly pass through the third relief hole 80a after passing through the heating film 30, so that the possibility that the heat insulating film 80 blocks the high-temperature substance is reduced, and the safety of the secondary battery 21 is improved. In one example, the size of the third relief hole 80a is larger than the size of the explosion-proof valve 21 b.

Referring to fig. 16, the battery module 20 further includes a flexible heat conductive sheet 90. The heating film 30 is connected to the top surface 21a through a flexible heat conductive sheet 90. The flexible thermally conductive sheet 90 itself has plastic deformation properties, and thus can be closely attached to the heating film 30 and the top surface 21a of the secondary battery 21, which is advantageous for improving heat conduction efficiency and reducing heat loss during the transfer process. Optionally, the material of the flexible heat conducting sheet 90 is silicon gel or rubber. In one example, referring to fig. 17, the flexible heat conductive sheet 90 has a fourth relief hole 90a corresponding to the position of the explosion-proof valve 21 b. The fourth relief hole 90a penetrates the flexible heat conductive sheet 90 in the thickness direction of the flexible heat conductive sheet 90. Thus, on the one hand, when the explosion-proof valve 21b is exploded, the high-temperature substance can smoothly pass through the fourth relief hole 90a, the possibility that the flexible heat-conducting strip 90 blocks the high-temperature substance is reduced, and the safety of the secondary battery 21 is improved. In one example, the fourth relief hole 90a has a size greater than that of the explosion proof valve 21 b.

The utility model discloses battery module 20 heats secondary battery 21 through heating film 30 to make secondary battery 21's operating temperature keep at normal operating temperature, guarantee self normal performance, thereby reduce secondary battery 21 because of the available capacity that operating temperature appears reduces and the possibility that energy utilization efficiency descends on the low side, be favorable to improving secondary battery 21's working property, safety in utilization and life.

The embodiment of the utility model provides a still provide a vehicle. The vehicle of the embodiment of the present invention includes a power source, the battery pack 10 of the above embodiment, and a vehicle body. The power source and the battery pack 10 are provided in the vehicle body. In one example, the power source includes a drive motor, a transmission, and wheels. The driving motor is electrically connected to the battery pack 10. The battery pack 10 supplies electric power to the driving motor. The driving motor converts the electric energy into mechanical energy and then drives the wheels to rotate through the transmission mechanism, so that the vehicle is driven to move. Alternatively, the battery pack 10 is provided at the bottom of the vehicle body. Optionally, the vehicle of the embodiment may be a new energy vehicle such as a pure electric vehicle, a hybrid vehicle, or an extended range vehicle. The battery pack 10 includes an upper case, a lower case, and one or more battery modules 20. The upper case and the lower case are fastened to form a receiving space in which the battery module 20 is received. When the number of the battery modules 20 is two or more, the two or more battery modules 20 are arranged in a matrix. The upper shell and the lower shell form a box body. The box body can be in the form of frame, box or disc.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and particularly, various features shown in the various embodiments may be combined in any combination as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery module, comprising:

a battery unit including two or more secondary batteries arranged side by side; the secondary battery has a top surface;

a heating film extending in an arrangement direction of the secondary batteries, the heating film being connected to the top surfaces of the secondary batteries, the heating film for heating the secondary batteries;

the sampling circuit board, the sampling circuit board with it sets up to add the range upon range of to heat the membrane, the sampling circuit board set up in it keeps away from to add the hot film one side of surface.

2. The battery module according to claim 1, further comprising a first adhesive member through which the heating film is adhesively connected to the top surface, and/or a second adhesive member through which the heating film is adhesively connected to the sampling circuit board.

3. The battery module according to claim 1, wherein at least one of the heating film and the sampling circuit board has a heat fusion part through which the heating film and the sampling circuit board are heat-fused.

4. The battery module according to claim 1, wherein:

the secondary battery includes an explosion-proof valve disposed at the top surface, the heating film having a first relief hole corresponding to the position of the explosion-proof valve; or,

the heating film is provided with a first nick surrounding the explosion-proof valve, or the heating film is provided with more than two first nicks surrounding the explosion-proof valve at intervals.

5. The battery module according to claim 1, wherein:

the secondary battery comprises an explosion-proof valve arranged on the top surface, and the sampling circuit board is provided with a second abdicating hole corresponding to the position of the explosion-proof valve; or,

the sampling circuit board is provided with a second nick surrounding the explosion-proof valve, or the sampling circuit board is provided with more than two second nicks surrounding the explosion-proof valve at intervals.

6. The battery module according to any one of claims 1 to 5, wherein the secondary battery has a positive terminal and a negative terminal disposed at an interval, each of the positive terminal and the negative terminal protrudes from the top surface, and the heating film is disposed between the positive terminal and the negative terminal.

7. The battery module according to any one of claims 1 to 3, further comprising a heat insulating film disposed between the sampling circuit board and the heating film, wherein a projected area of the heat insulating film in a thickness direction of the heating film is larger than a projected area of the heating film.

8. The battery module according to claim 7, wherein the secondary battery includes an explosion-proof valve provided at the top surface, and the heat insulating film has a third relief hole corresponding to the position of the explosion-proof valve.

9. The battery module according to any one of claims 1 to 5, further comprising a flexible thermally conductive sheet, wherein the heating film is connected to the top surface through the flexible thermally conductive sheet.

10. A battery pack comprising the battery module according to any one of claims 1 to 9.

11. A vehicle, characterized by comprising:

a power source for providing motive power to the vehicle;

the battery pack of claim 10 configured to provide electrical energy to the power source.