Battery pack and electric device

Abstract

The invention relates to a battery pack and a power utilization device, and the battery pack comprises a box body which is provided with an accommodation space; the battery cell group is mounted in the accommodating space; the battery cell group is provided with at least two battery cells which are sequentially arranged along the first direction and have opposite large surfaces; the thin film type temperature and pressure sensor comprises a temperature and pressure sensing piece, a signal transmission line and a connector, and the two ends of the signal transmission line are connected with the temperature and pressure sensing piece and the connector respectively. The temperature and pressure sensing sheet is clamped between the large surfaces of the two battery cells or between the large surfaces of the battery cells and the box body, and the joint is connected with the circuit board; the temperature and pressure sensing piece can sense the temperature and the pressure of the battery cell through the large surface and transmit the temperature and the pressure to the circuit board through the signal transmission line and the connector. By directly collecting the temperature of the large surface of the battery cell, the accuracy of temperature collection is improved, and the film type temperature and pressure sensor can also collect the actual pressure of the battery cell, so that early warning can be performed before the safety risk of the battery pack occurs, and the safety and reliability of the battery pack are ensured. Meanwhile, temperature and pressure data are transmitted to the connector through the signal transmission line and transmitted to the circuit board through the connector, the film type temperature and pressure sensor is conveniently connected with the circuit board through the connector, and the transmission effect of the temperature and pressure data is guaranteed.

Description

Technical Field

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

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles has gradually increased. As a result, people's requirements for the core components of new energy vehicles - power batteries are getting higher and higher. Among them, the safety and stability of power batteries occupy an important position.

[0003] In order to ensure the safety and stable operation of the power battery, its temperature needs to be continuously detected. In traditional technology, the battery pack temperature detection position is at the top cover of the battery cell or the bus position. Since the above detection position is far away from the battery cell, there is a certain gap between the actual temperature of the battery cell and the temperature detection accuracy is not high. In this way, when the battery cell has a safety risk, the problem cannot be discovered and alarmed in time, which poses a safety hazard. Summary of the invention

[0004] Based on this, it is necessary to provide a battery pack and an electrical device that can improve the accuracy of temperature detection to reduce safety hazards in order to address the above problems.

[0005] A battery pack, comprising:

[0006] A box body having a containing space;

[0007] A battery cell group is installed in the accommodation space; the battery cell group comprises at least two battery cells arranged in sequence along a first direction and with their major surfaces facing each other;

[0008] A thin-film temperature and pressure sensor comprises a temperature and pressure sensing sheet, a signal transmission line and a connector, wherein two ends of the signal transmission line are respectively connected to the temperature and pressure sensing sheet and the connector; the temperature and pressure sensing sheet is sandwiched between the large surfaces of the two battery cells or between the large surface of the battery cell and the box body, and the connector is connected to a circuit board; the temperature and pressure sensing sheet can sense the temperature and pressure of the battery cell through the large surface, and transmit the sensed sensed senses to the circuit board through the signal transmission line and the connector.

[0009] In one embodiment, the battery pack includes a plurality of battery cell groups arranged in sequence along a second direction; the first direction intersects with the second direction;

[0010] The thin film temperature and pressure sensor is arranged between at least two adjacent battery cells in each group of the battery cells and / or the thin film temperature and pressure sensor is arranged between the battery cells in each group of the battery cells and the box.

[0011] In one embodiment, the temperature and pressure sensing sheet includes a sensing sheet body and a signal lead-out portion connected to each other, and the signal transmission line is connected to the signal lead-out portion;

[0012] The sensing sheet is attached to the large surface, and the signal lead-out portion is bent relative to the sensing sheet and attached to the top cover of the battery cell.

[0013] In one of the embodiments, the bending radius of the signal lead-out portion is greater than or equal to 2 mm.

[0014] In one embodiment, the size of the sensing sheet is matched with the size of the large surface, the length of the signal lead-out portion in the second direction is smaller than the length of the sensing sheet; and the first direction intersects with the second direction.

[0015] In one embodiment, the temperature and pressure sensing sheet includes a first sheet layer and a second sheet layer, a plurality of pressure sensing points are arranged in an array between the first sheet layer and the second sheet layer, and a temperature sensing component is arranged on the side of the first sheet layer facing away from the second sheet layer.

[0016] In one embodiment, the connector is a plug, and the connector is plugged and fixed to a socket on the circuit board; or, the connector is welded and fixed to the circuit board.

[0017] In one embodiment, the circuit board includes a flexible circuit board and a rigid circuit board connected to each other, and the connector is connected to the rigid circuit board; or

[0018] The circuit board comprises a flexible circuit board and connecting wires which are connected to each other, and the connector is connected to the flexible circuit board.

[0019] In one embodiment, the battery pack further comprises an isolation disk, the isolation disk cover is arranged on the top cover of the battery cell, and the circuit board is arranged on the isolation disk;

[0020] The isolation disk is provided with a first avoidance groove, and the connector is led out through the first avoidance groove and connected to the circuit board.

[0021] An electrical device comprises the battery pack as described above.

[0022] In the above-mentioned battery pack and electrical device, since the temperature and pressure sensing piece of the thin film temperature and pressure sensor is sandwiched between the large surfaces of the two battery cells or between the large surface of the battery cell and the box body, the temperature and pressure sensing piece can sense the pressure (expansion force) and temperature of the battery cell through the large surface of the battery cell, and the temperature and pressure data are transmitted to the circuit board through the signal transmission line and the connector. In this way, by directly collecting the temperature of the large surface of the battery cell, the accuracy of temperature collection is improved, and the thin film temperature and pressure sensor can also collect the actual pressure of the battery cell, which can be used to warn in advance before the battery pack has safety risks, thereby ensuring the safety and reliability of the battery pack. At the same time, in the present application, the temperature and pressure data are transmitted to the connector through the signal transmission line, and then transmitted to the circuit board through the connector. The setting of the connector facilitates the connection between the thin film temperature and pressure sensor and the circuit board, thereby ensuring the transmission effect of the temperature and pressure data; and the connector of the thin film temperature and pressure sensor is directly connected to the circuit board without the interference of the intermediate connector, which can reduce the interference of other signals and the transmission energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural diagram of a battery pack provided in one embodiment of the present application;

[0024] Figure 2 for Figure 1 An enlarged view of the battery pack at point A shown in FIG.

[0025] Figure 3 for Figure 1 A structural diagram of a partial structure of a battery pack shown in ;

[0026] Figure 4 for Figure 1 An axonometric view of a thin-film temperature and pressure sensor of a battery pack shown in ;

[0027] Figure 5 for Figure 4 An axonometric view of the thin film temperature and pressure sensor shown in another perspective;

[0028] Figure 6 for Figure 4 The structural diagram of the partial structure of the thin film temperature and pressure sensor shown in;

[0029] Figure 7 for Figure 6 A structural diagram of another perspective of the structure shown in;

[0030] Figure 8 for Figure 6 The structure shown in omits the structural diagram of the first layer.

[0031] Description of reference numerals:

[0032] 100, battery pack; 10, box; 20, battery cell group; 21, battery cell; 211, large surface; 30, thin film temperature and pressure sensor; 31, temperature and pressure sensing sheet; 311, sensing sheet body; 3111, pressure sensing area; 3112, temperature sensing area; 312, signal lead-out part; 313, first sheet layer; 314, second sheet layer; 315, pressure sensing point; 316, temperature sensing component; 32, signal transmission line; 33, connector; 40, circuit board; 50, isolation plate; 51, first avoidance groove; 52, second avoidance groove; 60, bus. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0039] See also Figure 1-Figure 3 An embodiment of the present application provides a battery pack 100, including a case 10 and a battery cell group 20. The case 10 has a accommodating space, and the battery cell group 20 is installed in the accommodating space. The battery cell group 20 has at least two battery cells 21 arranged in sequence along a first direction and with large surfaces 211 facing each other. Specifically, the first direction is the width direction of the battery cell 21, and every two adjacent battery cells 21 are attached to each other in the width direction of the battery cell 21, and the surfaces of the battery cells 21 that are attached to each other are the large surfaces 211 of the battery cells 21. The outer contour of the large surface 211 is a rectangle, and the long side and short side of the rectangle are the sides formed by the battery cell 21 along its length direction and height direction, respectively.

[0040] The battery pack 100 further includes a thin-film temperature and pressure sensor 30 and a circuit board 40. Figure 4 and Figure 5The thin-film temperature and pressure sensor 30 includes a temperature and pressure sensing sheet 31, a signal transmission line 32 and a connector 33. The two ends of the signal transmission line 32 are respectively connected to the temperature and pressure sensing sheet 31 and the connector 33. The temperature and pressure sensing sheet 31 is sandwiched between the large surfaces 211 of the two battery cells 21 or sandwiched between the large surface 211 of the battery cell 21 and the box 10, and the connector 33 is connected to the circuit board 40. Among them, the temperature and pressure sensing sheet 31 is in the form of a thin sheet and can sense the temperature and pressure of the battery cell 21 through the large surface 211, and transmit it to the circuit board 40 through the signal transmission line 32 and the connector 33.

[0041] During the circulation and storage process, the battery cell 21 will expand due to the gas production of side reactions inside the battery pack 100 and the thickening of the electrode after lithium insertion. It is easy to detect the expansion force of a single battery cell 21, but when the battery cells 21 are assembled to form the battery pack 100, the battery cells 21 are closely arranged and it is impossible to monitor the expansion force of the large surface 211 according to the conventional scheme. In order to ensure that the battery pack 100 does not fail due to the expansion of the battery cell 21 during its entire life cycle, it is necessary to detect the expansion force of the battery cell 21.

[0042] In the battery pack 100 provided in the embodiment of the present application, since the temperature and pressure sensing sheet 31 of the thin-film temperature and pressure sensor 30 is sandwiched between the large surfaces 211 of the two battery cells 21 or sandwiched between the large surface 211 of the battery cell 21 and the box body 10, the temperature and pressure sensing sheet 31 can sense the pressure (expansion force) and temperature of the battery cell 21 through the large surface 211 of the battery cell 21, and the temperature and pressure data are transmitted to the circuit board 40 through the signal transmission line 32 and the connector 33. In this way, by directly collecting the temperature of the large surface 211 of the battery cell 21, the accuracy of temperature collection is improved, and the thin-film temperature and pressure sensor 30 can also collect the actual pressure of the battery cell 21, which can provide an early warning before the battery pack 100 has a safety risk, thereby ensuring the safety and reliability of the battery pack 100. At the same time, in the present application, the temperature and pressure data are transmitted to the connector 33 through the signal transmission line 32, and then transmitted to the circuit board 40 through the connector 33. The setting of the connector 33 facilitates the connection between the thin film temperature and pressure sensor 30 and the circuit board 40, thereby ensuring the transmission effect of the temperature and pressure data; moreover, the connector 33 of the thin film temperature and pressure sensor 30 is directly connected to the circuit board 40 without the interference of intermediate connecting parts, which can reduce the interference of other signals and the transmission energy consumption.

[0043] It should be noted here that after the temperature and pressure data are transmitted to the circuit board 40, the circuit board 40 can also transmit the data to the battery management system (BMS).

[0044] In some embodiments, see Figure 1The battery pack 100 includes a plurality of battery cell groups 20 arranged in sequence along the second direction, and a thin-film temperature and pressure sensor 30 is provided between at least two adjacent battery cells 21 of each battery cell group 20 and / or a thin-film temperature and pressure sensor 30 is provided between the battery cells 21 of each battery cell group 20 and the box body 10. The first direction intersects with the second direction. Specifically, the first direction is perpendicular to the second direction. The second direction is the length direction of the battery cell 21. Figure 1 , the first direction is Figure 1 The middle X direction, the second direction is Figure 1 Center Y direction.

[0045] Continue reading Figure 1 A thin-film temperature and pressure sensor 30 is provided between at least two adjacent cells 21 of each cell group 20 and / or a thin-film temperature and pressure sensor 30 is provided between the cell 21 of each cell group 20 and the box 10, including the following implementations:

[0046] 1. A thin-film temperature and pressure sensor 30 is provided between at least two adjacent battery cells 21 of each battery cell group 20;

[0047] 2. A thin-film temperature and pressure sensor 30 is provided between the battery cell 21 of each battery cell group 20 and the box body 10;

[0048] 3. A thin-film temperature and pressure sensor 30 is provided between at least two adjacent battery cells 21 of each battery cell group 20 , and a thin-film temperature and pressure sensor 30 is provided between the battery cells 21 of each battery cell group 20 and the box body 10 .

[0049] With the above arrangement, the thin-film temperature and pressure sensor 30 can detect the temperature and pressure of the large surface 211 of the battery cell 21 at the corresponding position, so as to detect the temperature and pressure of the battery pack 100 from multiple positions, thereby ensuring the accuracy of the detection.

[0050] In some specific embodiments, a thin film temperature and pressure sensor 30 is provided between each adjacent two battery cells 21 of each battery cell group 20, and a thin film temperature and pressure sensor 30 is provided between the battery cells 21 of each battery cell group 20 and the end beam of the box body 10. In this way, the temperature and pressure of all battery cells 21 included in the battery pack 100 can be measured, so that the battery pack 100 can be fully tested for pressure and temperature.

[0051] It should be noted that in some other embodiments, the specific arrangement of the thin film temperature and pressure sensor 30 is arranged according to thermal management requirements and is not limited here.

[0052] In some embodiments, see Figure 4The temperature and pressure sensing sheet 31 includes a sensing sheet body 311 and a signal lead-out part 312 that are connected to each other, and the signal transmission line 32 is connected to the signal lead-out part 312. The sensing sheet body 311 is in contact with the large surface 211, and the signal lead-out part 312 is bent relative to the sensing sheet body 311 to be in contact with the top cover of the battery cell 21. On the one hand, the sensing sheet body 311 is in contact with the large surface 211, which ensures the detection effect; on the other hand, the signal lead-out part 312 is bent and in contact with the top cover of the battery cell 21, which facilitates the fixation of the temperature and pressure sensing sheet 31 and, at the same time, reduces the space occupied by the signal lead-out part 312 in the height direction of the battery cell 21, thereby reducing the floor space of the entire battery pack 100.

[0053] Optionally, the bending radius of the signal lead-out portion 312 is greater than or equal to 2 mm, so that it can be attached to the top cover of the battery cell 21 after being led out. Of course, in some other embodiments, the bending radius of the signal lead-out portion 312 can be selected as needed and is not limited here.

[0054] Furthermore, the size of the sensing sheet 311 matches the size of the large surface 211, and the length of the signal lead-out portion 312 in the second direction is smaller than the length of the sensing sheet 311. In this way, the length of the signal lead-out portion 312 in the second direction is prevented from being too long, thus saving materials.

[0055] In some embodiments, see Figure 6-Figure 8 The temperature and pressure sensing sheet 31 includes a first sheet layer 313 and a second sheet layer 314. A plurality of pressure sensing points 315 are arranged in an array between the first sheet layer 313 and the second sheet layer 314. A temperature sensing component 316 is arranged on the side of the first sheet layer 313 away from the second sheet layer 314. Since the temperature and pressure sensing sheet 31 is arranged in an array with a plurality of pressure sensing points 315, the more pressure sensing points 315 are, the more data there are, and the more accurate the collection is.

[0056] It should be noted that the temperature and pressure sensing sheet 31 uses the resistance of the material to change with the change of the force, so as to achieve the test of the pressure. When the temperature and pressure sensing sheet 31 is subjected to external force, the pressure sensing point 315 for collecting the pressure is deformed, so that the resistance value of the temperature and pressure sensing sheet 31 changes. By measuring the change of the resistance value, the magnitude of the force can be obtained, so as to measure, record and analyze the pressure distribution of the large surface 211 of the battery cell 21.

[0057] Continue reading Figure 5 The temperature and pressure sensing sheet 31 has a pressure sensing area 3111 and a temperature sensing area 3112. The pressure sensing points 315 are distributed in the pressure sensing area 3111. The temperature sensing component 316 is arranged in the temperature sensing area 3112. The area of ​​the pressure sensing area 3111 is larger than that of the temperature sensing area 3112. In this way, the number of pressure sensing points 315 can be increased, so that more data is collected, and the accuracy of pressure collection is guaranteed.

[0058] In some embodiments, the connector 33 is a plug, and the connector 33 is plugged and fixed to a socket on the circuit board 40 to facilitate connection and removal of the film-type temperature and pressure sensor 30 and the circuit board 40 .

[0059] It can be understood that in other embodiments, the connector 33 is fixed to the circuit board 40 by welding to ensure the connection effect.

[0060] Optionally, the joint 33 is wrapped with an insulating portion to prevent the joint 33 from being oxidized by air.

[0061] In some embodiments, the circuit board 40 includes a flexible circuit board (FPC) and a rigid circuit board (PCB) connected to each other, the connector 33 is connected to the rigid circuit board, and the flexible circuit board is connected to the battery management system to transmit pressure and temperature data to the battery management system. That is, the circuit board 40 is a flexible combined board, which is a circuit board with FPC characteristics and PCB characteristics formed by combining the flexible circuit board and the rigid circuit board through processes such as pressing and other processes according to relevant process requirements. The circuit board 40 is configured in this way so as to be connected to the connector 33 of the thin-film temperature and pressure sensor 30 and the battery management system.

[0062] The battery management system integrates a pressure detection module, which displays the pressure value and pressure distribution map of each thin-film temperature and pressure sensor 30 in real time, and provides pressure history record query and analysis functions, so as to facilitate maintenance personnel to quickly diagnose and handle problems.

[0063] In other embodiments, the circuit board 40 includes a flexible circuit board and a connecting wire connected to each other, the connector 33 is connected to the flexible circuit board, and the connecting wire is connected to the battery management system to transmit the pressure and temperature data to the battery management system. Since the flexible circuit board is thin and bendable, and the connecting wire is flexible and has a long-distance transmission capability, the space in the battery pack 100 can be fully utilized, and the space occupied by the battery pack 100 can be reduced while facilitating the connection between the film-type temperature and pressure sensor 30 and the battery management system.

[0064] Continue reading Figure 1 and Figure 2 The battery pack 100 further includes an isolation disk 50, which is covered on the top cover of the battery cell 21, and the circuit board 40 is disposed on the isolation disk 50. The isolation disk 50 is used to insulate and isolate the battery cell 21 from the circuit board 40. A first avoidance groove 51 is disposed on the isolation disk 50, and the connector 33 is led out through the first avoidance groove 51 and connected to the circuit board 40. The provision of the isolation disk 50, on the one hand, plays a role in isolating the battery cell 21 from the circuit board 40, and on the other hand, the isolation disk 50 will not interfere with the lead-out of the connector 33 of the film-type temperature and pressure sensor 30 while supporting the circuit board 40.

[0065] Furthermore, the battery pack 100 further includes a busbar 60, and a second avoidance groove 52 is provided on the isolation plate 50, and the pole of the battery cell 21 is electrically connected to the busbar 60 through the second avoidance groove 52. The second avoidance groove 52 is provided to facilitate the electrical connection between the busbar 60 and the pole, and at the same time, the isolation plate 50 also plays a role in supporting the busbar 60.

[0066] Another embodiment of the present application further provides an electrical device, including the above-mentioned battery pack 100.

[0067] Optionally, the electrical device is a vehicle, which may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.

[0068] It is worth noting that, for pure electric vehicles, the above-mentioned battery pack 100 can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0069] In other embodiments, there is no limitation on the types of electrical devices, such as electrical devices may also be ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment may be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment may be carousels, bungee jumping machines, etc. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery pack, characterized in that: include: The box body (10) has a storage space; A battery cell group (20) is installed in the accommodation space; The battery cell group (20) comprises at least two battery cells (21) arranged in sequence along a first direction and with their large surfaces (211) facing each other; A thin-film temperature and pressure sensor (30) comprises a temperature and pressure sensing sheet (31), a signal transmission line (32) and a connector (33); the two ends of the signal transmission line (32) are respectively connected to the temperature and pressure sensing sheet (31) and the connector (33); the temperature and pressure sensing sheet (31) is sandwiched between the large surfaces (211) of two battery cells (21) or between the large surface (211) of the battery cell (21) and the box (10); the connector (33) is connected to a circuit board (40); the temperature and pressure sensing sheet (31) can sense the temperature and pressure of the battery cell (21) through the large surface (211) and transmit the information to the circuit board (40) through the signal transmission line (32) and the connector (33).

2. The battery pack according to claim 1, characterized in that: The battery pack comprises a plurality of battery cell groups (20) arranged in sequence along a second direction; the first direction intersects with the second direction; The thin-film temperature and pressure sensor (30) is provided between at least two adjacent battery cells (21) of each battery cell group (20) and / or the thin-film temperature and pressure sensor (30) is provided between the battery cells (21) of each battery cell group (20) and the box (10).

3. The battery pack according to claim 1, characterized in that: The temperature and pressure sensing sheet (31) comprises a sensing sheet body (311) and a signal lead-out portion (312) connected to each other, and the signal transmission line (32) is connected to the signal lead-out portion (312); The sensing sheet (311) is in contact with the large surface (211), and the signal lead-out portion (312) is bent relative to the sensing sheet (311) and in contact with the top cover of the battery cell (21).

4. The battery pack according to claim 3, characterized in that: The bending radius of the signal lead-out portion (312) is greater than or equal to 2 mm.

5. The battery pack according to claim 3, characterized in that: The size of the sensing sheet (311) is matched with the size of the large surface (211); the length of the signal lead-out portion (312) in the second direction is smaller than the length of the sensing sheet (311); and the first direction intersects with the second direction.

6. The battery pack according to claim 1, characterized in that: The temperature and pressure sensing sheet (31) comprises a first sheet layer (313) and a second sheet layer (314); a plurality of pressure sensing points (315) are arranged in an array between the first sheet layer (313) and the second sheet layer (314); and a temperature sensing component (316) is arranged on a side of the first sheet layer (313) facing away from the second sheet layer (314).

7. The battery pack according to claim 1, characterized in that: The connector (33) is a plug, and the connector (33) is plugged and fixed to the socket on the circuit board (40); or the connector (33) is welded and fixed to the circuit board (40).

8. The battery pack according to claim 1, characterized in that: The circuit board (40) comprises a flexible circuit board and a rigid circuit board connected to each other, and the connector is connected to the rigid circuit board; or The circuit board comprises a flexible circuit board and connecting wires which are connected to each other, and the connector is connected to the flexible circuit board.

9. The battery pack according to claim 1, characterized in that: The battery pack further comprises an isolation disk (50), wherein the isolation disk (50) is disposed on a top cover of the battery cell (21), and the circuit board (40) is disposed on the isolation disk (50); The isolation disk (50) is provided with a first avoidance groove (51), and the connector (33) is led out through the first avoidance groove (51) and connected to the circuit board (40).

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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