Temperature detection device, battery pack, battery pack, and electric device

Abstract

The utility model discloses a temperature detection device, battery pack, battery pack and electrical equipment, temperature detection device includes: protection subassembly, first protection piece and second protection piece are opposite to set up in first direction, core body subassembly, core body subassembly sets up between first protection piece and second protection piece, and core body subassembly transmits first protection piece and second protection piece and carries out temperature measurement. Through the ratio of the size b1 of temperature detection device in second direction and the size a1 of temperature detection device in first direction and the ratio of the size c1 of temperature detection device in third direction and the size a1 of temperature detection device in first direction satisfy: b1 / a1 >= 100, c1 / a1 >= 80, temperature detection device can form a thin film structure like this, when temperature detection device sets up in battery pack and carries out temperature measurement to electric core, also can not excessively occupy the space in battery pack, and the thin film structure can carry out multi -point temperature measurement to can avoid the emergence insufficient condition of pressure resistance.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a temperature detection device, a battery pack, a battery module, and electrical equipment. Background Technology

[0002] In related technologies, temperature detection devices can measure the temperature of battery cells to ensure their stable operation. However, the limited space within existing battery packs makes it easy for insufficient voltage withstand performance to occur when measuring temperature at a single point. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a temperature detection device that, when installed inside a battery pack to measure the temperature of the battery cells, does not occupy excessive space within the battery pack. Moreover, its thin-film structure allows for multi-point temperature measurement, thereby avoiding insufficient voltage resistance.

[0004] This utility model further proposes a battery pack.

[0005] This utility model further proposes a battery pack.

[0006] This utility model further proposes an electrical device.

[0007] The temperature detection device according to this utility model includes: a protective component, the protective component including: a first protective member and a second protective member, the first protective member and the second protective member being disposed opposite to each other in a first direction; a core component, the core component being disposed between the first protective member and the second protective member, and the core component measuring temperature through the first protective member and the second protective member; wherein, the dimension of the temperature detection device in the first direction is a1, the dimension of the temperature detection device in the second direction is b1, and the dimension of the temperature detection device in the third direction is c1, the relationship between a1, b1 and c1 is: b1 / a1≥100, c1 / a1≥80, the first direction is the thickness direction of the temperature detection device, the second direction is the length direction of the temperature detection device, and the third direction is the width direction of the temperature detection device, the first direction, the second direction and the third direction are arranged perpendicularly to each other.

[0008] According to the temperature detection device of this utility model, the ratio of the dimension b1 of the temperature detection device in the second direction to the dimension a1 of the temperature detection device in the first direction, and the ratio of the dimension c1 of the temperature detection device in the third direction to the dimension a1 of the temperature detection device in the first direction, satisfy the following: b1 / a1≥100, c1 / a1≥80. In this way, the temperature detection device can form a relatively thin film structure. When the temperature detection device with this thin film structure is set in the battery pack to measure the temperature of the battery cell, it will not occupy too much space in the battery pack. Moreover, the thin film structure can perform multi-point temperature measurement and can avoid the situation of insufficient pressure resistance.

[0009] In some examples of this utility model, the dimensions of the first protective member and the second protective member in the first direction are both a2, the dimensions of the first protective member and the second protective member in the second direction are both b2, and the dimensions of the first protective member and the second protective member in the third direction are both c2. The relationship between a2, b2 and c2 is: 100 < b2 / a2 ≤ 200000, 80 < c2 / a2 ≤ 30000.

[0010] In some examples of this utility model, the core assembly includes: a plurality of temperature sensing layers, which are spaced apart, wherein the direction in which the plurality of temperature sensing layers extend forms a preset angle with the direction in which the plurality of temperature sensing layers are spaced apart.

[0011] In some examples of this utility model, the dimension of the temperature measuring layer in the first direction is a3, the dimension of the temperature measuring layer in the second direction is b3, and the dimension of the temperature measuring layer in the third direction is c3. The relationship between a3, b3 and c3 is: 100 < b3 / a3 ≤ 200000, 80 < c3 / a3 ≤ 30000.

[0012] In some examples of this utility model, the temperature measuring layer is attached to the first protective member and the second protective member, and temperature is measured through the first protective member and / or the second protective member; or the first protective member and / or the second protective member are respectively provided with a plurality of first through holes, and the plurality of first through holes are respectively provided in a one-to-one correspondence with the plurality of temperature measuring layers, and the temperature measuring layer measures temperature through the first through holes.

[0013] In some examples of this utility model, in the second direction, the first protective member and the second protective member are sequentially provided with a first temperature measuring section, a second temperature measuring section and a third temperature measuring section, and a plurality of first through holes are respectively provided in the first temperature measuring section, the second temperature measuring section and the third temperature measuring section.

[0014] In some examples of this utility model, a plurality of first through holes located in the first temperature measuring section are spaced apart in the third direction upwards, a plurality of first through holes located in the second temperature measuring section are spaced apart in the third direction upwards, and a plurality of first through holes located in the third temperature measuring section are spaced apart in the third direction upwards.

[0015] In some examples of this utility model, one end of the temperature sensing layer in the extension direction is a contact end, the contact end is exposed outside the first protective member and the second protective member, and the contact end is adapted to be electrically connected to the data acquisition system.

[0016] In some examples of this utility model, the contact end is electrically connected to the data acquisition system; or a connecting wire is connected to the contact end, and the connecting wire is electrically connected to the data acquisition system.

[0017] In some examples of this utility model, the connecting wire and the contact end are connected by soldering, reflow soldering, laser micro-welding, nano-silver conductive adhesive bonding or mechanical contact.

[0018] In some examples of this utility model, the core assembly includes: a first core, the first core being adapted to perform temperature measurement through the first protective member and / or the second protective member.

[0019] In some examples of this utility model, the first core includes a thermal resistor and a conductive metal component, the thermal resistor and the conductive metal component being electrically connected, the thermal resistor being used for temperature measurement, and the conductive metal component being used for contact electrical connection with a data acquisition system.

[0020] In some examples of this utility model, the core assembly includes: a second core, a third core, and a separator, wherein the separator is disposed between the first protective member and the second protective member, the second core is disposed between the first protective member and the separator, the third core is disposed between the second protective member and the separator, and the second core is electrically connected to the third core.

[0021] In some examples of this utility model, the second core is a thermocouple structure or a metal foil structure, and the third core is a thermocouple structure or a metal foil structure.

[0022] In some examples of this utility model, the separator is provided with a plurality of second through holes, and the second core and the third core are electrically connected through the second through holes.

[0023] In some examples of this utility model, the first protective member and the second protective member are respectively provided with a plurality of first through holes.

[0024] In some examples of this utility model, the projections of the plurality of first through holes in the first direction coincide with the projections of the plurality of second through holes in the first direction.

[0025] In some examples of this utility model, the diameter of the first through hole and / or the second through hole is d1, and the value range of d1 is: 0.2mm≤d1≤10mm.

[0026] In some examples of this utility model, the distance between two adjacent first through holes and / or the distance between two adjacent second through holes is d2, and the value range of d2 is: 10mm≤d2≤400mm.

[0027] In some examples of this utility model, the second core has a dimension of d3 in the first direction, the third core has a dimension of d4 in the first direction, the separator has a dimension of a4 in the first direction, the second core and the third core are connected at the second through hole by a connector, and the sum of the dimensions of the connector in the first direction is d5. The relationship between d3, d4, a4 ​​and d5 is: d3+d4+d5≤d3+d4+a4.

[0028] In some examples of this utility model, the size of the separator in the second direction is b4, the size of the separator in the third direction is c4, and the relationship between a4, b4 and c4 is: 100 < b4 / a4 ≤ 200000, 80 < c4 / a4 ≤ 30000.

[0029] In some examples of this utility model, the separator is provided with a first snap-fit ​​portion, and the first protective member and the second protective member are respectively provided with a second snap-fit ​​portion, and the first snap-fit ​​portion and the second snap-fit ​​portion are engaged in a snap-fit ​​cooperation.

[0030] In some examples of this utility model, the core assembly further includes a fixing member, wherein the separator is connected to the second core and the third core respectively via the fixing member.

[0031] In some examples of this invention, the temperature detection device further includes a humidity sensor and / or a pressure sensor, wherein the humidity sensor and / or the pressure sensor is disposed on the separator.

[0032] In some examples of this utility model, the first protective member, the second protective member, and the separator are all flexible structural members.

[0033] In some examples of this utility model, the separator is a ceramic film structure, an insulating plastic structure, or a glass fiber reinforced plastic structure.

[0034] In some examples of this utility model, the first protective component is at least one of a plastic structural component and a ceramic film structural component, and the second protective component is at least one of a plastic structural component and a ceramic film structural component; or the first protective component is a metal oxide film structural component or a high-temperature resistant polymer film structural component, and the second protective component is a metal oxide film structural component or a high-temperature resistant polymer film structural component.

[0035] The battery pack according to this utility model includes: a plurality of battery cells arranged sequentially among the plurality of battery cells, and the temperature detection device described above, which is used to measure the temperature of the battery cells.

[0036] In some examples of this utility model, the temperature detection device is disposed between the large surfaces of two adjacent battery cells; or the temperature detection device is disposed between the electrode cores inside the battery cell; or the temperature detection device is disposed between the electrode cores inside the battery cell and the battery cell outer shell.

[0037] In some examples of this utility model, the battery pack further includes a filler disposed between the battery cells and integrated into the temperature detection device.

[0038] In some examples of this utility model, when the temperature detection device is disposed between the large surfaces of two adjacent battery cells, the size of the battery cell in the second direction is b5, the size of the battery cell in the third direction is c5, and the relationship between b1, c1, b5 and c5 is: b1≥b5, c1≥c5.

[0039] The battery pack according to this utility model includes: a housing; and the battery pack described above, wherein the battery pack is disposed within the housing.

[0040] The electrical device according to this utility model includes: the battery pack described above.

[0041] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0042] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a first structural schematic diagram of a temperature detection device according to an embodiment of the present utility model;

[0044] Figure 2 This is a second structural schematic diagram of the temperature detection device according to an embodiment of the present utility model;

[0045] Figure 3 This is an exploded view of a temperature detection device according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of a battery pack according to another embodiment of the present invention.

[0047] Figure label:

[0048] 1. Temperature detection device;

[0049] 10. Protective component; 100. First protective component; 101. Second protective component; 102. First through hole; 103. First temperature measuring section; 104. Second temperature measuring section; 105. Third temperature measuring section; 20. Core assembly; 200. Temperature measuring layer; 201. Contact end; 202. Second core; 203. Third core; 204. Separator; 205. Second through hole; 2. Battery pack; 30. Housing; 40. Cell; 50. Battery group. Detailed Implementation

[0050] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0051] The following is for reference. Figures 1-4 Describes a temperature detection device 1 according to an embodiment of the present invention.

[0052] like Figure 3 As shown, the temperature detection device 1 according to an embodiment of the present invention includes a protective component 10 and a core component 20. The protective component 10 provides electrical isolation to prevent unnecessary contact between the core component 20 and the external environment, which could lead to short circuits or measurement errors. The core component 20 is the main part of the temperature detection device 1 and can measure the temperature of the object being measured through the protective component 10. For example, in a battery pack 2, the core component 20 can measure the temperature of the battery cell 40.

[0053] like Figure 3 As shown, the protective assembly 10 includes a first protective member 100 and a second protective member 101, which are disposed opposite to each other in a first direction. A core assembly 20 is disposed between the first protective member 100 and the second protective member 101, and the core assembly 20 measures temperature through the first and second protective members 100 and 101. The first and second protective members 100 and 101 are components of the protective assembly 10, both protecting the core assembly 20 from external environmental influences and ensuring that no short circuits or measurement errors occur during temperature measurement.

[0054] The first protective component 100 and the second protective component 101 are arranged opposite each other in a first direction, for example, the first direction is vertical. The first protective component 100 and the second protective component 101 are located on the upper and lower sides of the core assembly 20, respectively, and are arranged correspondingly or symmetrically to each other along the vertical direction. The core assembly 20 is disposed between the first protective component 100 and the second protective component 101. At this time, the first protective component 100 and the second protective component 101 can protect the core assembly 20, ensuring that the core assembly 20 will not experience short circuits or measurement errors during temperature measurement. The core assembly 20 measures temperature through the first protective component 100 and the second protective component 101. This can enhance the protection, stability, and reliability of the core assembly 20 while ensuring the accuracy of temperature measurement. The edges of the first protective component 100 and the second protective component 101 are formed into a covering structure by hot pressing, with a contact exposure window reserved only at one end of the core assembly 20. The size can be 0.5mm-5mm × 0.5mm-5mm.

[0055] Among them, such as Figure 1 and Figure 4 As shown, the temperature detection device 1 has a dimension of a1 in the first direction, a dimension of b1 in the second direction, and a dimension of c1 in the third direction. The relationship between a1, b1, and c1 is: b1 / a1≥100, c1 / a1≥80. Here, the first direction is the thickness direction of the temperature detection device 1, the second direction is the length direction of the temperature detection device 1, and the third direction is the width direction of the temperature detection device 1. The first direction, the second direction, and the third direction are set perpendicular to each other.

[0056] In other words, the ratio of the length dimension to the thickness dimension of the temperature detection device 1 is very large, and the ratio of the width dimension to the thickness dimension of the temperature detection device 1 is also very large. Therefore, the structure of the temperature detection device 1 tends to be a thin film structure. In this way, without affecting the structural strength of the temperature detection device 1, when the temperature detection device 1 is placed inside the battery pack 2 to measure the temperature of the battery cell 40, it will not occupy too much space inside the battery pack 2. Moreover, the thin film structure can perform multi-point temperature measurement and can avoid the situation of insufficient pressure resistance.

[0057] Therefore, by ensuring that the ratio of the dimension b1 of the temperature detection device 1 in the second direction to the dimension a1 of the temperature detection device 1 in the first direction, and the ratio of the dimension c1 of the temperature detection device 1 in the third direction to the dimension a1 of the temperature detection device 1 in the first direction, the following conditions are met: b1 / a1≥100, c1 / a1≥80, the temperature detection device 1 can form a relatively thin film structure. Thus, when the temperature detection device 1 is placed inside the battery pack 2 to measure the temperature of the battery cell 40, it will not occupy too much space inside the battery pack 2. Moreover, the thin film structure can perform multi-point temperature measurement, thereby avoiding the situation of insufficient pressure resistance.

[0058] Specifically, such as Figure 3 As shown, the dimensions of the first protective member 100 and the second protective member 101 in the first direction are both a2, the dimensions of the first protective member 100 and the second protective member 101 in the second direction are both b2, and the dimensions of the first protective member 100 and the second protective member 101 in the third direction are both c2. The relationship between a2, b2 and c2 is: 100 < b2 / a2 ≤ 200000, 80 < c2 / a2 ≤ 30000.

[0059] In other words, the ratio of the length dimension to the thickness dimension of the first protective component 100 and the second protective component 101 is very large, as is the ratio of the width dimension to the thickness dimension of the first protective component 100 and the second protective component 101. As a result, the structure of the first protective component 100 and the second protective component 101 tends to be a thin-film structure. The first protective component 100 and the second protective component 101 are components of the temperature detection device 1. Thus, without affecting the structural strength of the temperature detection device 1, when the temperature detection device 1 is set inside the battery pack 2 to measure the temperature of the battery cell 40, it will not occupy too much space inside the battery pack 2. Moreover, the thin-film structure can perform multi-point temperature measurement and can avoid the situation of insufficient pressure resistance. It should be noted that the dimensions of the first protective component 100 and the second protective component 101 in the first direction are less than 1 mm, and can generally be 0.01 mm, 0.03 mm, 0.05 mm and 0.1 mm. The dimensions of the first protective component 100 and the second protective component 101 in the first direction cannot be less than 0.01 mm, otherwise the first protective component 100 and the second protective component 101 will be too small and easily cause damage.

[0060] Among them, such as Figure 3 As shown, the core assembly 20 includes multiple temperature-sensing layers 200, which are spaced apart. The extending directions of the multiple temperature-sensing layers 200 form a preset angle with the direction in which they are spaced apart. The multiple temperature-sensing layers 200 perform temperature measurement. The spaced-apart arrangement avoids interference between the multiple temperature-sensing layers 200 and allows for a wider distribution, thus improving the temperature measurement accuracy of the core assembly 20. The preset angle between the extending directions of the multiple temperature-sensing layers 200 and the direction in which they are spaced apart allows for multi-point temperature measurement of the object being measured along the extending directions. The temperature-sensing layers 200 can be configured as temperature-sensing metal foils. Generally, in the embodiments disclosed in this application, the preset angle is between 60° and 120°, preferably 90°.

[0061] In addition, such as Figure 3As shown, the dimension of the temperature sensing layer 200 in the first direction is a3, the dimension of the temperature sensing layer 200 in the second direction is b3, and the dimension of the temperature sensing layer 200 in the third direction is c3. The relationship between a3, b3, and c3 is: 100 < b3 / a3 ≤ 200000, 80 < c3 / a3 ≤ 30000. That is to say, the ratio of the dimension in the length direction to the dimension in the thickness direction of the temperature sensing layer 200 is very large, and the ratio of the dimension in the width direction to the dimension in the thickness direction of the temperature sensing layer 200 is also very large. Thus, the structure of the temperature sensing layer 200 tends to be a thin film structure. The temperature sensing layer 200 is a component of the temperature detection device 1. In this way, without affecting the structural strength of the temperature detection device 1, when the temperature detection device 1 is placed inside the battery pack 2 to measure the temperature of the battery cell 40, it will not occupy too much space inside the battery pack 2. Moreover, the thin film structure can perform multi-point temperature measurement, thereby avoiding insufficient pressure resistance. It should be noted that the size of the temperature sensing layer 200 in the first direction is less than 1 mm, and can generally be 0.01 mm, 0.03 mm, 0.05 mm and 0.1 mm. The size of the temperature sensing layer 200 in the first direction cannot be less than 0.01 mm, otherwise the temperature sensing layer 200 will be easily damaged if the size is too small.

[0062] Of course, such as Figures 1-3 As shown, the temperature measuring layer 200 is attached to the first protective member 100 and the second protective member 101, and temperature is measured through the first protective member 100 and / or the second protective member 101. Alternatively, the first protective member 100 and / or the second protective member 101 are respectively provided with a plurality of first through holes 102, and the plurality of first through holes 102 are respectively provided in a one-to-one correspondence with a plurality of temperature measuring layers 200, and the temperature measuring layer 200 measures temperature through the first through holes 102.

[0063] The temperature measuring layer 200 can be configured with the first protective component 100 and the second protective component 101 in two ways. The first way is that the temperature measuring layer 200 can be attached to the first protective component 100 and the second protective component 101. In this case, the temperature measuring layer 200 can directly measure the temperature of the object being measured through the first and second protective components 100 or 101, or it can measure the temperature of the object being measured through one of the first and second protective components 100 or 101, thus achieving accurate temperature measurement. The second way is that multiple first and second protective components 100 can be provided. The first through-hole 102, or one of the first protective member 100 and the second protective member 101, can be provided with multiple first through-holes 102. These multiple first through-holes 102 enable the temperature measuring layer 200 to measure the temperature of the object being measured at multiple points. Each of the multiple first through-holes 102 corresponds one-to-one with a different temperature measuring layer 200, thus improving the temperature measurement accuracy of the multiple temperature measuring layers 200. The temperature measuring layer 200 measures temperature through the first through-holes 102, enabling multi-point temperature measurement in the second direction and layered temperature measurement in the third direction, achieving multi-point, layered, and accurate temperature measurement. In general, the first protective member 100 and / or the second protective member 101 may not have multiple first through-holes 102, and the temperature measuring layer 200 can be attached to both the first and second protective members 101 for temperature measurement.

[0064] Furthermore, such as Figure 1 and Figure 2As shown, in the second direction, the first protective member 100 and the second protective member 101 are sequentially provided with a first temperature measuring section 103, a second temperature measuring section 104 and a third temperature measuring section 105. A plurality of first through holes 102 are respectively provided in the first temperature measuring section 103, the second temperature measuring section 104 and the third temperature measuring section 105. Moreover, the plurality of first through holes 102 located in the first temperature measuring section 103 are spaced apart in the third direction, the plurality of first through holes 102 located in the second temperature measuring section 104 are spaced apart in the third direction, and the plurality of first through holes 102 located in the third temperature measuring section 105 are spaced apart in the third direction. The first temperature measuring section 103, the second temperature measuring section 104, and the third temperature measuring section 105 can all perform temperature measurement. Each of these sections has multiple first through holes 102, meaning that the first protective component 100 and the second protective component 101 each have multiple first through holes 102. The core assembly 20 can measure the temperature through these multiple first through holes 102, thus enabling multi-point temperature measurement of the object being measured. The multiple first through holes 102 located in the first temperature measuring section 103 are spaced apart in a third-order direction. The first through holes 102 located in the second temperature measuring section 104 and the third temperature measuring section 105... Multiple first through holes 102 within section 4 are spaced apart in the third-direction upward direction. Similarly, multiple first through holes 102 within the third temperature measuring section 105 are also spaced apart in the third-direction upward direction. In this third-direction upward direction, the multiple first through holes 102 are spaced apart on the first temperature measuring section 103, the second temperature measuring section 104, and the third temperature measuring section 105, respectively. This arrangement avoids interference between the multiple first through holes 102 and allows for a wider distribution range. This enables the core assembly 20 to perform multi-point temperature measurement on the object being measured in the second direction, which also improves the temperature measurement accuracy of the core assembly 20 to some extent. It should be noted that the number of temperature measuring sections can be set based on actual needs.

[0065] In addition, such as Figure 1 and Figure 2 As shown, one end of the temperature sensing layer 200 in its extending direction is a contact end 201, which protrudes from the first protective member 100 and the second protective member 101. The contact end 201 is suitable for electrical connection with the data acquisition system. The contact end 201 can be connected to other components. The contact end 201 protrudes from the first protective member 100 and the second protective member 101. In the extending direction of the temperature sensing layer 200, one end extends to the edge of the first protective member 100 and the second protective member 101. This facilitates electrical connection between the contact end 201 and the external system. The contact end 201 is suitable for electrical connection with the data acquisition system, ensuring that the temperature signal can be accurately transmitted from the temperature sensing layer 200 to the data acquisition system, thereby realizing temperature monitoring and control and guaranteeing the reliability and accuracy of the temperature sensing layer 200.

[0066] It should be noted that contact terminal 201 is electrically connected to the data acquisition system, or a connecting cable is connected to contact terminal 201 and electrically connected to the data acquisition system. Contact terminal 201 and the data acquisition system can be connected in two ways: direct electrical contact or connection via a connecting cable. Direct electrical connection reduces signal attenuation, simplifies installation, and improves reliability. Alternatively, connection via a connecting cable increases flexibility, making it easier to adapt to complex environments and remote monitoring.

[0067] In addition, the connecting wires and contact terminals 201 are connected via soldering, reflow soldering, laser micro-welding, nano-silver conductive adhesive bonding, or mechanical contact. Soldering has advantages such as low cost, mature technology, high connection strength, and good electrical and thermal conductivity. High-temperature solders, such as silver-based solders, can be used instead of soldering, which can meet the welding requirements in higher temperature environments. Reflow soldering has advantages such as high automation and suitability for mass production. Laser micro-welding has advantages such as high precision, small heat-affected zone, ability to weld dissimilar metals, and suitability for miniaturized structures. Reflow soldering uses nickel plating with a thickness of ≥2μm at the exposed contact window. The solder joint size is ≤1mm when connecting the connecting wires via reflow soldering. 2 Nano-silver conductive adhesive bonding requires no high-temperature treatment, making it suitable for flexible connection requirements. It can reduce thermal damage to materials caused by welding, and has good flexibility and fatigue resistance. The thickness of the nano-silver conductive adhesive bonding layer can be adjusted within the range of 1μm-10μm, and it can be used for non-planar structures. Mechanical contact connection is easy to install, can be repeatedly plugged and unplugged, requires no welding process, and is easy to maintain and replace. The connection between the connecting wire and the contact end 201 can be achieved by soldering, reflow soldering, laser micro-welding, nano-silver conductive adhesive bonding, or mechanical contact connection. This method is more in line with actual working conditions and facilitates the connection between the contact end 201 and the connecting wire, thereby realizing the electrical connection between the contact end 201 and the data acquisition system through the connecting wire.

[0068] The core assembly 20 includes a first core, which is adapted to measure temperature through the first protective element 100 and / or the second protective element 101. The first core is a component of the core assembly 20 and functions as a temperature sensor. In a first direction, the first core is located between the first protective element 100 and the second protective element 101, allowing temperature measurement through both elements. This configuration enhances the protective properties, stability, and reliability of the first core while ensuring measurement accuracy.

[0069] In addition, the first core includes a resistance temperature detector (RTD) and a conductive metal component. The RTD and the conductive metal component are electrically connected. The RTD is used for temperature measurement, and the conductive metal component is used for contact electrical connection with the data acquisition system. The RTD and the conductive metal component are components of the first core. The RTD can be used for temperature measurement, and the conductive metal component can be contacted and electrically connected to the data acquisition system. This connection allows temperature measurement to be performed through the first protective element 100 and the second protective element 101 on both sides of the first core in a first direction. The conductive metal component connects the RTD and the data acquisition system, ensuring that the temperature signal is accurately transmitted from the RTD to the data acquisition system, thereby enabling temperature monitoring and control and guaranteeing the reliability and accuracy of the first core. It should be noted that the temperature measurement area of ​​the RTD is less than or equal to 25 mm. 2 The temperature measured by the resistance temperature detector (RTD) is the average temperature of the area. To improve the accuracy of temperature measurement, the area of ​​the RTD is limited. The RTD can be formed by coating, printing or sputtering. There is a one-to-one correspondence between the resistance value and the temperature of the RTD. The contact position between the conductive metal part and the data acquisition system is the contact point of the exposed window.

[0070] Of course, such as Figure 3As shown, the core assembly 20 includes a second core 202, a third core 203, and a separator 204. The separator 204 is disposed between the first protective member 100 and the second protective member 101. The second core 202 is disposed between the first protective member 100 and the separator 204. The third core 203 is disposed between the second protective member 101 and the separator 204. The second core 202 and the third core 203 are electrically connected. The second core 202, the third core 203, and the separator 204 are components of the core assembly 20. The second core 202 and the third core 203 can perform temperature measurement, while the separator 204 can perform insulation, positioning, or support functions. The second core 202 and the third core 203 are separated by the separator 204, which is located between the first protective member 100 and the second protective member 101. The second core 202 is located between the first protective member 100 and the separator 204, and the third core 203 is located between the second protective member 101 and the separator 204. In other words, the temperature detection device 1 is arranged in the following order in the first direction: first protective member 100, second core 202, separator 203, and third core 203. The core assembly 20 comprises a spacer 204, a third core 203, and a second protective member 101. The second core 202 and the third core 203 are electrically connected via the spacer 204. For example, when the temperature detection device 1 detects the cell 40 closest to the first protective member 100, the first protective member 100 can fit against the larger surface of the cell 40, and the second core 202 and the third core 203 jointly detect the temperature of the cell 40. Conversely, when the temperature detection device 1 detects the cell 40 closest to the second protective member 101, the second protective member 101 can fit against the larger surface of the cell 40, and the second core 202 and the third core 203 jointly detect the temperature of the cell 40. This enhances the protectiveness, stability, and reliability of the core assembly 20 while ensuring temperature measurement accuracy. The second core 202 and the third core 203 completely overlap in their planar projections.

[0071] Furthermore, such as Figure 3As shown, the second core 202 is either a thermocouple structure or a metal foil structure, and the third core 203 is either a thermocouple structure or a metal foil structure. Thermocouple structures offer numerous advantages, including robustness, a wide temperature measurement range, rapid response, no external power supply required, ease of installation and maintenance, and cost-effectiveness. Metal foil structures offer advantages such as high precision and miniaturization, good electrical and thermal conductivity, high temperature resistance, and corrosion resistance. By constructing the second core 202 and the third core 203 as either a thermocouple structure or a metal foil structure, they better suit actual working conditions. The second core 202 and the third core 203 offer greater flexibility and reliability, making them suitable for various complex temperature monitoring needs and enabling better temperature measurement of the object being measured. It should be noted that both the second core 202 and the third core 203 can be made of K-type (nickel-chromium-nickel-silicon) or T-type (copper-constantan) materials, and can be formed by vacuum evaporation, etching or die-cutting processes. In addition, both the second core 202 and the third core 203 can be made of E-type (platinum-rhodium-platinum) thermocouple materials, which can achieve a higher temperature range measurement, with a temperature resistance of up to 1800℃. The forming process can be laser deposition or plasma spraying, and the single layer thickness can be maintained in the range of 10μm-100μm.

[0072] In addition, such as Figure 3 As shown, the separator 204 is provided with multiple second through holes 205, through which the second core 202 and the third core 203 are electrically connected. The multiple second through holes 205 enable the electrical connection between the second core 202 and the third core 203. The second core 202 and the third core 203 are separated by the separator 204 and only contact each other at the second through holes 205, thus enabling temperature measurement of the second core 202 and the third core 203. The metallization plating within the second through holes 205 can employ a multi-layer plating structure, such as a copper / silver / copper composite plating, which can improve the conductivity and oxidation resistance of the second through holes 205. The plating thickness ranges from 1μm to 10μm.

[0073] It should be noted that, as Figure 3As shown, the first protective component 100 and the second protective component 101 are respectively provided with a plurality of first through holes 102. The projections of the plurality of first through holes 102 in the first direction coincide with the projections of the plurality of second through holes 205 in the first direction. The plurality of first through holes 102 can realize multi-point temperature measurement of the object being measured by the temperature measuring component. The coincidence of the projections of the plurality of first through holes 102 in the first direction with the projections of the plurality of second through holes 205 in the first direction can ensure the consistency of signal transmission, improve the temperature measurement accuracy of the temperature detection device 1, reduce heat loss, improve temperature response speed and measurement accuracy, and at the same time facilitate the improvement of reliability and service life. It can realize the temperature measurement of the second core 202 and the third core 203.

[0074] In addition, such as Figure 1 As shown, the diameter of the first through hole 102 and / or the second through hole 205 is d1, and the value of d1 ranges from 0.2mm to 10mm. It should be noted that the diameters of both the first through hole 102 and the second through hole 205 must meet certain ranges, or the diameter of one of the first through hole 102 and the second through hole 205 must meet certain ranges. Specifically, the diameters of the first through hole 102 and / or the second through hole 205 cannot be too small, i.e., less than 0.2mm. This would restrict the transfer of heat from the object being measured to the temperature sensing component, resulting in a slower temperature response and affecting the temperature measurement accuracy. Secondly, if the diameters of the first through hole 102 and / or the second through hole 205 are too small, it may lead to poor contact between the temperature sensing component and the object being measured, affecting the signal transmission quality. Furthermore, if the diameters of the first through hole 102 and / or the second through hole 205 are too small, thermal stress concentration points are easily formed around them, especially in high-temperature environments, which may lead to material fatigue or failure. Meanwhile, the diameter of the first through hole 102 and / or the second through hole 205 cannot be too large, that is, greater than 10 mm. This would weaken the overall strength of the temperature detection device 1 and may lead to local deformation or breakage. Secondly, if the first through hole 102 and / or the second through hole 205 is too large, stress concentration points are easily formed around it, making it more susceptible to damage when subjected to external pressure or vibration. In addition, if the first through hole 102 and / or the second through hole 205 is too large, more air or other media will enter the first through hole 102 and / or the second through hole 205, which will increase thermal resistance and thus affect the temperature response speed and measurement accuracy. Therefore, in order to improve the temperature measurement accuracy of the core component 20, the diameter d1 of the first through hole 102 and / or the second through hole 205 is in the range of 0.2 mm to 10 mm.

[0075] Optionally, such as Figure 1As shown, the distance between two adjacent first through holes 102 and / or the distance between two adjacent second through holes 205 is d2, and the value range of d2 is: 10mm≤d2≤400mm. It should be noted that the distance between two adjacent first through holes 102 and the distance between two adjacent second through holes 205 must both meet certain ranges, or the distance between one of the two adjacent first through holes 102 and the two adjacent second through holes 205 must meet certain ranges. Specifically, the distance between two adjacent first through holes 102 and / or the distance between two adjacent second through holes 205 cannot be too small, that is, less than 10mm. This would reduce the effective area of ​​the temperature detection device 1, thereby weakening the overall structural strength and potentially causing local deformation or breakage. Secondly, a distance that is too small will increase the processing difficulty, requiring higher precision to ensure that the holes do not interfere with or overlap each other. In addition, a distance that is too small may cause thermal interference between adjacent through holes, affecting measurement accuracy. Meanwhile, the distance between the two first through holes 102 and / or the distance between two adjacent second through holes 205 cannot be too large, i.e., greater than 400mm. This would lead to uneven temperature distribution in the measured area, which may result in local temperature differences not being accurately captured. Secondly, a large distance between two adjacent first through holes 102 and / or two adjacent second through holes 205 would lengthen the heat conduction path, increase the heat transfer time and path complexity, thereby reducing the temperature response speed and temperature measurement accuracy. In addition, a large distance between two adjacent first through holes 102 and / or two adjacent second through holes 205 would reduce the number of sampling points and reduce the data acquisition density, thus affecting the overall description and analysis of the temperature of the measured object. Therefore, in order to ensure the temperature measurement accuracy of the core component 20, the value range of the distance d2 between two adjacent first through holes 102 and / or two adjacent second through holes 205 is 10mm to 400mm.

[0076] It should be noted that the second core 202 has a dimension of d3 in the first direction, the third core 203 has a dimension of d4 in the first direction, and the separator 204 has a dimension of a4 in the first direction. The second core 202 and the third core 203 are connected at the second through hole 205 by a connector. The sum of the dimensions of the connector in the first direction is d5. The relationship between d3, d4, a4 ​​and d5 is: d3+d4+d5≤d3+d4+a4. It should be noted that, in the first direction, the dimensions of the second core 202, the third core 203, the connector, and the separator 204 must meet certain conditions. Specifically, in the first direction, the sum of the dimensions of the second core 202, the third core 203, and the connector must be less than or equal to the sum of the dimensions of the second core 202, the third core 203, and the separator 204. In other words, in the first direction, the size of the connector between the second core 202 and the third core 203 must be smaller than the size of the separator 204. In this case, the thickness of the connector will not affect the overall thickness of the temperature detection device 1. With a small overall thickness, the temperature detection device 1 can be positioned between the large surfaces of two adjacent cells 40. The temperature detection device 1 will not cause uneven stress on the cells 40 and will not occupy unnecessary space. At the second through-hole 205, the second core 202 and the third core 203 can form a vertical interconnect structure through soldering, laser micro-welding, or nano-silver conductive adhesive.

[0077] Specifically, such as Figure 3 As shown, the dimension of the separator 204 in the second direction is b4, and the dimension of the separator 204 in the third direction is c4. The relationship between a4, b4, and c4 is: 100 < b4 / a4 ≤ 200000, 80 < c4 / a4 ≤ 30000. That is to say, the ratio of the dimension of the separator 204 in the length direction to the dimension in the thickness direction is very large, and the ratio of the dimension of the separator 204 in the width direction to the dimension in the thickness direction is also very large. Thus, the structure of the separator 204 tends to be a thin-film structure. The separator 204 is a component of the temperature detection device 1. In this way, without affecting the structural strength of the temperature detection device 1, when the temperature detection device 1 is placed inside the battery pack 2 to measure the temperature of the cell 40, it will not occupy too much space inside the battery pack 2. Moreover, the thin-film structure can perform multi-point temperature measurement, thereby avoiding the situation of insufficient pressure resistance. It should be noted that the dimension of the separator 204 in the first direction is less than 1mm, and can generally be 0.01mm, 0.03mm, 0.05mm and 0.1mm. The dimension of the separator 204 in the first direction cannot be less than 0.01mm, otherwise the separator 204 will be too small and easily break.

[0078] The separator 204 is provided with a first snap-fit ​​portion, and the first protective member 100 and the second protective member 101 are each provided with a second snap-fit ​​portion. The first snap-fit ​​portion and the second snap-fit ​​portion engage in a snap-fit ​​connection. Both the first snap-fit ​​portion and the second snap-fit ​​portion can perform a snap-fit ​​function, and the snap-fit ​​connection between the first snap-fit ​​portion and the second snap-fit ​​portion can realize the connection between the separator 204 and the first protective member 100 and the second protective member 101. The snap-fit ​​connection method is simpler and more convenient, and can make the connection between the separator 204 and the first protective member 100 and the second protective member 101 firm and reliable. The first snap-fit ​​portion can be set as a slot or a protrusion structure, and the second snap-fit ​​portion can be set as a groove. The first snap-fit ​​portion and the second snap-fit ​​portion engage in a snap-fit ​​connection.

[0079] In addition, the core assembly 20 also includes: fasteners, with the spacer 204 connected to the second core 202 and the third core 203 respectively via fasteners. The fasteners can be adhesives for bonding and fixing. The connection between the spacer 204 and the second core 202 and the third core 203 via fasteners further improves the bonding strength between the spacer 204 and the second core 202 and the third core 203. A micron-level mechanical interlocking structure can be provided between the spacer 204 and the second core 202 and the third core 203, which can increase the bonding strength between the spacer 204 and the second core 202 and the third core 203 to over 10 MPa.

[0080] Of course, the temperature detection device 1 also includes a humidity sensor and / or a pressure sensor, which are mounted on the separator 204. The humidity sensor can be used to measure the relative humidity in the air, that is, the ratio of the actual water vapor content in the air to the maximum possible water vapor content at that temperature. The pressure sensor can be used to measure the pressure of a gas or liquid. With the humidity sensor and / or pressure sensor mounted on the separator 204, the temperature detection device 1 can simultaneously detect multiple parameters, improving its overall performance.

[0081] Furthermore, such as Figure 3 As shown, the first protective component 100, the second protective component 101, and the separator 204 are all flexible structural components. Flexible structural components possess excellent flexibility, being bendable, foldable, and even stretchable. They can adapt to various complex shapes or dynamic deformation requirements without compromising their function. By setting the first protective component 100, the second protective component 101, and the separator 204 as bendable or deformable flexible structures, the temperature detection device 1 can be applied to temperature measurement on curved or irregular surfaces. The flexible material can be selected as flexible plastic or flexible ceramic material, with a thickness ranging from 5μm to 100μm.

[0082] In addition, such as Figure 3As shown, the separator 204 can be a ceramic film structure, an insulating plastic structure, or a glass fiber reinforced plastic structure. Ceramic film structures offer high insulation and good thermal conductivity, as well as high temperature and corrosion resistance. Insulating plastic structures offer advantages such as good flexibility, low cost, and pre-processing capabilities. Glass fiber reinforced plastic structures offer higher mechanical strength and chemical resistance, allowing for use in harsher environments. By using a ceramic film structure, insulating plastic structure, or glass fiber reinforced plastic structure for the separator 204, it better suits the actual working conditions and can serve as an insulator, positioner, or support. The thickness of the separator 204 can range from 5μm to 100μm, and the diameter and spacing of the second through hole 205 can be adjusted as needed.

[0083] It should be noted that, as Figure 3 As shown, the first protective component 100 is at least one of a plastic structural component and a ceramic film structural component, and the second protective component 101 is at least one of a plastic structural component and a ceramic film structural component. Alternatively, the first protective component 100 may be a metal oxide film structural component or a high-temperature resistant polymer film structural component, and the second protective component 101 may be a metal oxide film structural component or a high-temperature resistant polymer film structural component. Plastic structural components have advantages such as good flexibility, low cost, and easy processing. Ceramic film structural components have high insulation and good thermal conductivity, as well as high temperature resistance and corrosion resistance. Metal oxide film structural components have good high temperature resistance and corrosion resistance and can be used in high-temperature or corrosive environments. High-temperature resistant polymer film structural components have higher heat resistance and mechanical strength. The first protective component 100 and the second protective component 101 can be made of one or more composites of plastic structural components, ceramic film structural components, metal oxide film structural components, or high-temperature resistant polymer film structural components. In this case, the first protective component 100 and the second protective component 101 are more in line with actual working conditions and can protect the core assembly 20 from the influence of the external environment, ensuring that no short circuit or measurement error occurs during temperature measurement. The metal oxide film can be set as aluminum oxide or titanium oxide, and the thickness range of the first protective component 100 and the second protective component 101 can be 5μm-100μm. The high-temperature resistant polymer film can be set as a composite material of polyimide and polyetherimide, and the thickness range of the first protective component 100 and the second protective component 101 can be 5μm-100μm.

[0084] like Figure 4As shown, the battery pack 50 according to an embodiment of the present invention includes: a plurality of battery cells 40 arranged sequentially among them; and a temperature detection device 1 as described in the above embodiment, which is used to measure the temperature of the battery cells 40. The plurality of battery cells 40 are the basic working units of the battery pack 2, enabling the conversion between chemical energy and electrical energy. The sequential arrangement of the battery cells 40 allows for flexible configuration of voltage and capacitance, improving space utilization and avoiding interference between the battery cells 40, thus allowing for a wider distribution range of the battery cells 40. The temperature detection device 1 can be used to measure the temperature of the object being measured, and it can also be used to measure the temperature of the battery cells 40.

[0085] Specifically, such as Figure 4 As shown, the temperature detection device 1 is disposed between the large surfaces of two adjacent battery cells 40, or between the electrodes inside the battery cell 40, or between the electrodes and the battery cell shell inside the battery cell 40. The temperature detection device 1 can be disposed between the large surfaces of two adjacent battery cells 40, between the electrodes inside the battery cell 40, or between the electrodes and the battery cell shell. The temperature detection device 1 is thin and can withstand high pressure, so its presence will not cause changes in the stress on the battery cell 40. Furthermore, the temperature detection device 1 does not occupy unnecessary space. In addition, the temperature detection device 1 has a simple structure and is easy to operate. The number and position can be flexibly arranged according to the requirements of the temperature measurement points. During placement, it only needs to be pasted onto the large surface of the battery cell 40. The position of the first through hole 102 can be set according to the measurement point position on the large surface of the battery cell.

[0086] For example, nine temperature measuring points can be set on the surface of the battery cell 40, such as in a three-row, three-column configuration. The first and third columns are located 10mm to 30mm inward from the edge of the battery cell 40, the middle column is located at the midpoint of the length of the battery cell 40, the first and third rows are located 1mm to 10mm inward from the edge of the battery cell 40, and the middle row is located at the midpoint of the height. Each temperature measuring point area can be designed as an independent module, which facilitates replacement and maintenance. The modules can be quickly assembled and disassembled through detachable connections, such as plug-in connections.

[0087] Furthermore, the battery pack 50 also includes a filler, which is disposed between the battery cells 40 and integrated into the temperature detection device 1. The filler acts as a buffer, improving the structural stability of the battery cells 40. It can fix the position of the battery cells 40, preventing poor contact or damage due to relative movement between the cells 40, evenly distributing external pressure, reducing local stress concentration, and protecting the cells 40 from mechanical damage. By integrating the filler, heat can be distributed more evenly, ensuring each cell 40 receives consistent heating and preventing local overheating or undercooling. The filler has a certain degree of elasticity or flexibility, absorbing energy during impacts and reducing direct impact on the cells 40. The filler can be configured as a buffer or other structural component.

[0088] In addition, such as Figure 4 As shown, when the temperature detection device 1 is placed between the large surfaces of two adjacent battery cells 40, the size of the battery cell 40 in the second direction is b5, and the size of the battery cell 40 in the third direction is c5. The relationship between b1, c1, b5 and c5 is: b1≥b5, c1≥c5. It should be noted that when the temperature detection device 1 is placed between the large surfaces of two adjacent battery cells 40, the dimensions b1 of the temperature detection device 1 in the second direction and c1 in the third direction, and the dimensions b5 of the battery cell 40 in the second direction and c5 in the third direction, need to satisfy a certain relationship. Specifically, in both the second direction and the third direction, the dimensions of the temperature detection device 1 are greater than or equal to the dimensions of the battery cell 40. In this case, the temperature detection device 1 can cover a larger area to obtain temperature, which can enhance the heat conduction efficiency and facilitate the fixing and installation of the temperature detection device 1. In addition, the presence of the temperature detection device 1 will not cause changes in the force on the battery cell 40. Therefore, in order for the temperature detection device 1 to meet the temperature measurement point requirements of the battery cell 40 and not cause uneven force on the battery cell 40, the dimensions of the temperature detection device 1 in both the second direction and the third direction should be greater than or equal to the dimensions of the battery cell 40.

[0089] like Figure 4 As shown, the battery pack 2 according to an embodiment of the present invention includes: a housing 30, and the battery pack 50 described in the above embodiment, wherein the battery pack 50 is disposed within the housing 30. The housing 30 mainly serves to protect, isolate, dissipate heat, and provide electrical insulation. The battery pack 50 is an assembly of multiple battery cells 40 connected in series, parallel, or a combination of series and parallel, and can provide the required voltage, capacity, and power output. Since the battery pack 50 is disposed within the housing 30, the housing 30 can protect the battery pack 50, thereby ensuring that the battery pack 50 can achieve the mutual conversion of chemical energy and electrical energy.

[0090] Working principle of temperature detection device 1: When temperature detection device 1 measures temperature, the second core 202 and the third core 203 form a thermoelectric coupling at the second through hole 205. Due to the Seebeck effect, a thermoelectric potential is generated. The thermoelectric potential is transmitted to the two end contacts of the second core 202 and the third core 203 through the vertical interconnection structure of the second through hole 205, and then transmitted to the data acquisition system via the connecting line. The separator 204, the first protective component 100, and the second protective component 101 can meet the requirement of deformation less than or equal to 5% through the coordinated deformation of the flexible structural components. At this time, it can disperse the external pressure and the pressure resistance strength reaches 5MPa to 30MPa. The second core 202 and the third core 203 are bonded by a hot-pressing-adhesive composite process, and the interface bonding strength is greater than or equal to 8MPa, which can ensure the structural stability under high pressure environment.

[0091] The electrical equipment according to the present invention includes: the battery pack 2 described in the above embodiments.

[0092] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0093] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0095] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A temperature detection device (1), characterized in that, include: The protective component (10) includes: a first protective member (100) and a second protective member (101), wherein the first protective member (100) and the second protective member (101) are disposed opposite to each other in a first direction; A core assembly (20) is disposed between the first protective member (100) and the second protective member (101), and the core assembly (20) measures temperature through the first protective member (100) and the second protective member (101); Wherein, the temperature detection device (1) has a dimension of a1 in the first direction, a dimension of b1 in the second direction, and a dimension of c1 in the third direction. The relationship between a1, b1, and c1 is: b1 / a1≥100, c1 / a1≥80. The first direction is the thickness direction of the temperature detection device (1), the second direction is the length direction of the temperature detection device (1), and the third direction is the width direction of the temperature detection device (1). The first direction, the second direction, and the third direction are set perpendicular to each other.

2. The temperature detection device (1) according to claim 1, characterized in that, The first protective member (100) and the second protective member (101) both have a dimension of a2 in the first direction, the first protective member (100) and the second protective member (101) both have a dimension of b2 in the second direction, and the first protective member (100) and the second protective member (101) both have a dimension of c2 in the third direction. The relationship between a2, b2 and c2 is: 100 < b2 / a2 ≤ 200000, 80 < c2 / a2 ≤ 30000.

3. The temperature detection device (1) according to claim 1, characterized in that, The core assembly (20) includes: a plurality of temperature measuring layers (200), which are spaced apart, wherein the extension direction of the plurality of temperature measuring layers (200) forms a preset angle with the direction in which the plurality of temperature measuring layers (200) are spaced apart.

4. The temperature detection device (1) according to claim 3, characterized in that, The temperature measuring layer (200) has a dimension of a3 in the first direction, a dimension of b3 in the second direction, and a dimension of c3 in the third direction. The relationship between a3, b3, and c3 is: 100 < b3 / a3 ≤ 200000, 80 < c3 / a3 ≤ 30000.

5. The temperature detection device (1) according to claim 3, characterized in that, The temperature measuring layer (200) is attached to the first protective element (100) and the second protective element (101), and temperature measurement is performed through the first protective element (100) and / or the second protective element (101); or The first protective component (100) and / or the second protective component (101) are respectively provided with a plurality of first through holes (102), and the plurality of first through holes (102) are respectively provided in correspondence with the plurality of temperature measuring layers (200), and the temperature measuring layer (200) measures the temperature through the first through holes (102).

6. The temperature detection device (1) according to claim 5, characterized in that, In the second direction, the first protective member (100) and the second protective member (101) are sequentially provided with a first temperature measuring section (103), a second temperature measuring section (104) and a third temperature measuring section (105), and a plurality of first through holes (102) are respectively provided in the first temperature measuring section (103), the second temperature measuring section (104) and the third temperature measuring section (105).

7. The temperature detection device (1) according to claim 6, characterized in that, The plurality of first through holes (102) located in the first temperature measuring section (103) are spaced apart in the third direction, the plurality of first through holes (102) located in the second temperature measuring section (104) are spaced apart in the third direction, and the plurality of first through holes (102) located in the third temperature measuring section (105) are spaced apart in the third direction.

8. The temperature detection device (1) according to claim 5, characterized in that, One end of the temperature measuring layer (200) in the extending direction is a contact end (201), which is exposed outside the first protective member (100) and the second protective member (101). The contact end (201) is suitable for electrical connection with the data acquisition system.

9. The temperature detection device (1) according to claim 8, characterized in that, The contact end (201) is electrically connected to the data acquisition system contact; or A connecting wire is connected to the contact end (201), and the connecting wire is electrically connected to the data acquisition system.

10. The temperature detection device (1) according to claim 9, characterized in that, The connecting wire and the contact end (201) are connected by soldering, reflow soldering, laser micro-welding, nano-silver conductive adhesive bonding or mechanical contact.

11. The temperature detection device (1) according to claim 1, characterized in that, The core assembly (20) includes: a first core, the first core being adapted to perform temperature measurement through the first protective element (100) and / or the second protective element (101).

12. The temperature detection device (1) according to claim 11, characterized in that, The first core includes a thermal resistor and a conductive metal component, the thermal resistor and the conductive metal component being electrically connected, the thermal resistor being used for temperature measurement, and the conductive metal component being used for contact electrical connection with the data acquisition system.

13. The temperature detection device (1) according to claim 1, characterized in that, The core assembly (20) includes a second core (202), a third core (203), and a separator (204). The separator (204) is disposed between the first protective member (100) and the second protective member (101). The second core (202) is disposed between the first protective member (100) and the separator (204). The third core (203) is disposed between the second protective member (101) and the separator (204). The second core (202) and the third core (203) are electrically connected.

14. The temperature detection device (1) according to claim 13, characterized in that, The second core (202) is a thermocouple structure or a metal foil structure, and the third core (203) is a thermocouple structure or a metal foil structure.

15. The temperature detection device (1) according to claim 13, characterized in that, The separator (204) is provided with a plurality of second through holes (205), through which the second core (202) and the third core (203) are electrically connected.

16. The temperature detection device (1) according to claim 15, characterized in that, The first protective member (100) and the second protective member (101) are respectively provided with a plurality of first through holes (102).

17. The temperature detection device (1) according to claim 16, characterized in that, The projections of the plurality of first through holes (102) in the first direction coincide with the projections of the plurality of second through holes (205) in the first direction.

18. The temperature detection device (1) according to claim 16, characterized in that, The diameter of the first through hole (102) and / or the second through hole (205) is d1, and the value of d1 is in the range of 0.2mm≤d1≤10mm.

19. The temperature detection device (1) according to claim 16, characterized in that, The distance between two adjacent first through holes (102) and / or the distance between two adjacent second through holes (205) is d2, and the value range of d2 is: 10mm≤d2≤400mm.

20. The temperature detection device (1) according to claim 15, characterized in that, The second core (202) has a dimension of d3 in the first direction, the third core (203) has a dimension of d4 in the first direction, and the separator (204) has a dimension of a4 in the first direction. The second core (202) and the third core (203) are connected at the second through hole (205) by a connector. The sum of the dimensions of the connector in the first direction is d5. The relationship between d3, d4, a4 ​​and d5 is: d3 + d4 + d5 < d3 + d4 + a4.

21. The temperature detection device (1) according to claim 20, characterized in that, The size of the separator (204) in the second direction is b4, and the size of the separator (204) in the third direction is c4. The relationship between a4, b4 and c4 is: 100 < b4 / a4 ≤ 200000, 80 < c4 / a4 ≤ 30000.

22. The temperature detection device (1) according to claim 13, characterized in that, The separator (204) is provided with a first snap-fit ​​portion, and the first protective member (100) and the second protective member (101) are respectively provided with a second snap-fit ​​portion, and the first snap-fit ​​portion and the second snap-fit ​​portion are snap-fitted together.

23. The temperature detection device (1) according to claim 13, characterized in that, The core assembly (20) further includes a fixing member, wherein the separator (204) is connected to the second core (202) and the third core (203) respectively through the fixing member.

24. The temperature detection device (1) according to claim 13, characterized in that, Also includes: A humidity sensor and / or a pressure sensor, wherein the humidity sensor and / or the pressure sensor are disposed on the separator (204).

25. The temperature detection device (1) according to claim 13, characterized in that, The first protective component (100), the second protective component (101), and the separator (204) are all flexible structural components.

26. The temperature detection device (1) according to claim 13, characterized in that, The separator (204) is a ceramic film structure, an insulating plastic structure, or a glass fiber reinforced plastic structure.

27. The temperature detection device (1) according to claim 1, characterized in that, The first protective component (100) is at least one of a plastic structural component and a ceramic film structural component, and the second protective component (101) is at least one of a plastic structural component and a ceramic film structural component; or The first protective component (100) is a metal oxide thin film structure or a high-temperature resistant polymer thin film structure, and the second protective component (101) is a metal oxide thin film structure or a high-temperature resistant polymer thin film structure.

28. A battery pack (50), characterized in that, include: Multiple battery cells (40) are arranged sequentially among themselves. The temperature detection device (1) according to any one of claims 1-27 is used to measure the temperature of the battery cell (40).

29. The battery pack (50) according to claim 28, characterized in that, The temperature detection device (1) is disposed between the large surfaces of two adjacent battery cells (40); or The temperature detection device (1) is disposed between the electrode cores inside the battery cell (40); or The temperature detection device (1) is located between the electrode core and the outer shell inside the battery cell (40).

30. The battery pack (50) according to claim 28, characterized in that, Also includes: A filler is disposed between the cells (40) and integrated on the temperature detection device (1).

31. The battery pack (50) according to claim 28, characterized in that, When the temperature detection device (1) is placed between the large surfaces of two adjacent battery cells (40), the size of the battery cell (40) in the second direction is b5, and the size of the battery cell (40) in the third direction is c5. The relationship between b1, c1, b5 and c5 is: b1≥b5, c1≥c5.

32. A battery pack (2), characterized in that, include: Shell (30); The battery pack (50) according to any one of claims 28-31, wherein the battery pack (50) is disposed within the housing (30).

33. An electrical appliance, characterized in that, include: The battery pack (2) as described in claim 32.

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