Battery packs and electrical devices

Abstract

This application relates to the field of battery technology, and in particular to a battery pack and power supply device. The battery pack includes a battery module and an infrared temperature sensing component. The infrared temperature sensing component includes a detection bracket and an infrared temperature sensing element. The detection bracket forms a detection chamber that covers one side of the battery module in a first direction, and this side of the detection bracket is in contact with the battery module. The infrared temperature sensing element is disposed within the detection chamber and on the other side of the detection bracket in the first direction, facing the battery module. The battery pack and power supply device provided by this application solve the problem of the limited temperature detection capabilities of traditional temperature sensing elements, making the temperature acquisition results closer to the actual operating state of the battery. Furthermore, it ensures that the infrared signal received by the infrared temperature sensing element mainly comes from the battery module itself, further improving the accuracy of temperature detection.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] The quality of thermal management technology has a significant impact on the performance, lifespan, and safety of power batteries. Power batteries generate heat during charging and discharging. Under high and low temperature conditions, the performance of the battery cells is often limited by their inherent characteristics, leading to insufficient battery power during driving. The addition of thermal management technology can effectively improve the performance of the cells under various environmental conditions, ensuring appropriate performance and enhancing cell consistency and lifespan. The accuracy of temperature monitoring of the power battery is a key factor determining the quality of thermal management technology.

[0003] Current methods for monitoring the temperature of power batteries primarily involve creating a window in the insulating sheet of the cell's top cover and placing a negative temperature coefficient (NTC) thermistor in contact with the cell's top cover at this window. This NTC thermistor is then connected to a temperature-sensing element in the CCS (Clean Cell System) module to obtain battery stability data. However, by detecting temperature through this method of contact between the NTC thermistor and the temperature-sensing element, the temperature measured by the temperature-sensing element is actually the temperature of the portion of the cell in contact with the NTC thermistor. In other words, the temperature detected by the temperature-sensing element only reflects the temperature near the contact point of the cell, resulting in a biased reading. To compensate for this bias, a greater number and density of temperature-sensing elements would be needed, significantly increasing the cost of the battery temperature monitoring device and placing a burden on the battery, thus affecting its reliability. Utility Model Content

[0004] The purpose of this application is to provide a battery pack and power supply device to address, to some extent, the limitations of existing temperature sensors, which can only detect temperatures near the contact points of the battery cells, resulting in a one-sided temperature reading. To compensate for this limitation, the number and density of temperature sensors need to be increased, which not only increases the cost of the temperature acquisition device but also places a burden on the battery, affecting its reliability.

[0005] According to a first aspect of this application, a battery pack is provided, having a first orientation, including a battery module and an infrared temperature sensing component, wherein the infrared temperature sensing component includes a detection bracket and an infrared temperature sensing element; The detection bracket is configured to form a detection chamber that can cover one side of the battery module in a first direction. The side of the detection bracket in the first direction is transparent and fits the battery module. The infrared temperature sensing element is disposed in the detection chamber and is located on the other side of the detection bracket away from the battery module in the first direction, and facing the battery module.

[0006] Preferably, it further has a second direction perpendicular to the first direction; the detection bracket includes: The support portion surrounds and forms the detection chamber; The mounting portion is disposed on the side of the support portion away from the battery module in the first direction. The mounting portion extends along the second direction. The detection chamber is formed open on the side where the mounting portion is located. The infrared temperature sensing element is fixedly disposed on the side of the mounting portion facing the battery module.

[0007] Preferably, the dimension of the mounting portion in the second direction is larger than the dimension of the support portion in the second direction, so that the mounting portion can span the support portion along the second direction; A plurality of infrared temperature sensing elements are spaced apart along the second direction.

[0008] Preferably, the support portion includes multiple sub-frames, which are arranged side by side along the second direction to divide the detection chamber into multiple sub-detection chambers.

[0009] Preferably, the battery module includes multiple battery cells, which are stacked along the second direction; The testing bracket also includes a mounting plate, which is disposed between the battery module and the bracket. The side of the mounting plate facing the battery module has a plurality of limiting grooves, and the limiting grooves correspond one-to-one with the battery cells.

[0010] Preferably, the mounting plate (113) is a transparent component; And / or, a first reflective layer is provided on the inner side of the bracket portion.

[0011] Preferably, it further includes a housing and a cover that can be fastened together, the battery module is disposed in the housing, and the infrared temperature sensing component is disposed between the cover and the battery module; The portion of the cover plate opposite the detection chamber is provided with a second reflective layer.

[0012] Preferably, it further includes a liquid cooling plate disposed on the side of the battery module opposite to the infrared temperature sensing component in the first direction.

[0013] Preferably, it also has a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the battery pack further includes an NTC acquisition unit, which is disposed on one side of the battery module in the third direction; In the first direction, relative to the infrared temperature sensing component, the NTC acquisition unit is positioned close to the liquid cooling plate.

[0014] According to a second aspect of this application, an electrical device is provided, comprising a battery pack as described in any of the above-described technical solutions, and thus possesses all the beneficial technical effects of the battery pack, which will not be elaborated further here.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The battery pack provided in this application uses an infrared temperature sensing element to detect the infrared radiation energy on the surface of the battery module to obtain temperature. This eliminates the need for direct contact with the battery cells, avoiding the limitation of traditional NTC thermistors which can only detect temperatures near the contact point. A detection chamber covering one side of the battery module's surface in the first direction is provided to focus the infrared radiation emitted by the battery module, reducing interference from external environmental factors (such as airflow and other heat sources) on the detection signal. The design of the detection bracket fitting snugly against the battery module isolates external environmental temperature fluctuations to a certain extent. The infrared temperature sensing element provides real-time feedback on the temperature distribution over a large area, effectively solving the problem of the limited range of traditional temperature sensing elements and making the temperature acquisition results closer to the actual operating state of the battery. Furthermore, it ensures that the infrared signal received by the infrared temperature sensing element mainly comes from the battery module itself, further improving the accuracy of temperature detection.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application; Figure 2 Another exploded structural diagram of the battery pack provided in the embodiments of this application; Figure 3 This is an isometric view of the assembly structure of the battery module and the infrared temperature sensing component provided in the embodiments of this application; Figure 4 This is an isometric structural diagram of the cover plate provided in the embodiments of this application; Figure 5 This is an isometric schematic diagram of the battery pack provided in an embodiment of this application.

[0019] Figure label: 1-Infrared temperature sensing component; 11-Detection bracket; 100-Detection chamber; 101-Sub-detection chamber; 110-Bracket section; 111-Sub-frame; 1111-Reinforcing rib; 1112-Installation slot; 112-Erection section; 1121-Connecting piece; 1122-Overlapping piece; 113-Installation plate; 1131-Limiting slot; 12-Infrared temperature sensing element; 2-Battery module; 21-Battery cell; 22-NTC acquisition section; 3-Liquid cooling plate; 4-Thermoconductive adhesive layer; 5-Shell; 51-Partition beam; 52-Overlapping beam; 6-Cover plate; 61-Second reflective layer; 62-Docking slot.

[0020] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0022] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0023] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The following reference Figures 1 to 5 This application describes a battery pack and power supply device according to some embodiments.

[0027] See Figures 1 to 5 As shown, an embodiment of the first aspect of this application provides a battery pack having a first direction F1, comprising a battery module 2 and an infrared temperature sensing component 1. The infrared temperature sensing component 1 includes a detection bracket 11 and an infrared temperature sensing element 12. The detection bracket 11 forms a detection chamber 100 that covers one side of the battery module 2 in the first direction F1. The side of the detection bracket 11 in the first direction F1 is transparent and fits snugly against the battery module 2. The infrared temperature sensing element 12 is disposed within the detection chamber 100 and is also disposed on the other side of the detection bracket 11 in the first direction F1, facing the battery module 2.

[0028] The battery pack provided by the above-mentioned technical features uses an infrared temperature sensing element 12 to detect the infrared radiation energy on the surface of the battery module 2 to obtain the temperature. This eliminates the need for direct contact with the battery cell 21, avoiding the limitation of traditional NTC thermistors which can only detect temperatures near the contact point. A detection chamber 100 is provided to cover one side of the battery module 2 in the first direction F1, which can focus the infrared radiation emitted by the battery module 2, reducing interference from the external environment (such as airflow or other heat sources) on the detection signal. The design of the detection bracket 11 fitting snugly against the battery module 2 can isolate external environmental temperature fluctuations to a certain extent. The infrared temperature sensing element 12 provides real-time feedback of the temperature distribution over a large area, effectively solving the problem of the limited range of temperature detection by traditional temperature sensing elements, making the temperature acquisition results closer to the actual working state of the battery. Furthermore, it ensures that the infrared signal received by the infrared temperature sensing element 12 mainly comes from the battery module 2 itself, further improving the accuracy of temperature detection.

[0029] like Figures 1 to 3As shown in the figure, F1 can be an example of the first direction F1 described above. For ease of description, two intersecting directions on a plane perpendicular to the first direction F1 are defined as the second direction F2 and the third direction F3. F2 shown in the figure can be an example of the second direction F2 described above, and F3 shown in the figure can be an example of the third direction F3 described above. Preferably, the second direction F2 can be perpendicular to the third direction F3 described above, in order to accommodate the structure of most square battery packs.

[0030] Preferably, such as Figures 1 to 3 and Figure 5 As shown, the aforementioned detection bracket 11 may include a bracket portion 110 and a mounting portion 112. The bracket portion 110 may surround and form the detection chamber 100 to isolate external ambient temperature fluctuations. The mounting portion 112 is disposed on the side of the bracket portion 110 away from the battery module 2 in the first direction F1. The mounting portion 112 extends along the second direction F2. The detection chamber 100 is open on the side where the mounting portion 112 is located. An infrared temperature sensing element 12 is fixedly disposed on the side of the mounting portion 112 facing the battery module 2 to facilitate the infrared temperature sensing element 12 to detect the temperature inside the detection chamber 100.

[0031] Preferably, such as Figure 3 As shown, the size of the mounting part 112 in the second direction F2 can be larger than the size of the support part 110 in the second direction F2, so that the mounting part 112 can span the support part 110 along the second direction F2, thereby ensuring the stability of the mounting part 112 mounted on the support part 110.

[0032] Preferably, such as Figure 2 As shown, multiple infrared temperature sensing elements 12 are spaced apart along the second direction F2, which effectively increases the number of infrared temperature sensing elements 12 on the battery pack in the second direction F2 (i.e., the number of temperature acquisition points on the battery pack in the second direction F2), thereby improving the temperature acquisition range, temperature acquisition accuracy and temperature acquisition precision of the battery pack.

[0033] Preferably, such as Figure 3 As shown, the mounting portion 112 may include a connecting piece 1121 extending along the second direction F2 and overlapping pieces 1122 connected to both ends of the connecting piece 1121. The infrared temperature sensing elements 12 may be equally spaced on the connecting piece 1121 along the second direction F2. The overlapping pieces 1122 and the connecting piece 1121 may be spaced apart along the first direction F1 to form a limiting boss at the connection between the connecting piece 1121 and the overlapping piece 1122, so as to limit the mounting portion 112 in the second direction F2 through the limiting boss.

[0034] Preferably, such as Figures 1 to 3As shown, the overlapping piece 1122 and the connecting piece 1121 can be integral connectors formed by bending.

[0035] Preferably, such as Figure 1 As shown, the battery pack may further include multiple sub-frames 111, which can be arranged side-by-side along the second direction F2 to divide the detection chamber 100 into multiple sub-detection chambers 101. In this way, on the one hand, the sub-frames 111 can effectively support the mounting portion 112, ensuring the stability of the mounting portion 112; on the other hand, they can perform refined temperature detection on different areas of the battery module 2 (such as different cells 21, areas with weak heat dissipation, etc.). The temperature within each sub-detection chamber 101 can be independently detected and analyzed, enabling the thermal management system to accurately locate areas of abnormal temperature and take timely targeted measures (such as localized enhanced heat dissipation), effectively improving the precision of temperature control in the battery module 2 and preventing localized overheating from affecting the overall performance and lifespan of the battery pack.

[0036] Preferably, such as Figures 1 to 3 As shown, each of the above-mentioned sub-detection cavities 101 is provided with an infrared temperature sensing element 12 to enable the battery pack to achieve temperature detection in different regions.

[0037] Preferably, such as Figure 1 and Figure 3 As shown, the aforementioned support portion 110 may further include reinforcing ribs 1111. Each of the aforementioned sub-frames 111 may be provided with the reinforcing ribs 1111 in the middle. The reinforcing ribs 1111 may extend along the second direction F2 to divide the sub-detection cavity 101 into multiple temperature measurement areas arranged side by side along the third direction F3. Each temperature measurement area may be provided with an infrared temperature sensing element 12. On the one hand, this improves the support strength of the detection support 11; on the other hand, it further enhances the precision of the temperature control of the battery module 2.

[0038] like Figure 1 and Figure 3 As shown in the figure, an example is illustrated where each of the aforementioned sub-frames 111 is provided with one of the aforementioned reinforcing ribs 1111. In other words, each of the aforementioned sub-detection cavities 101 is divided into two temperature measurement areas arranged side by side along a third direction F3. Correspondingly, as Figure 1 As shown, the bracket portion 110 can be provided with two mounting portions 112 at intervals along the third direction F3, so that each temperature measuring area is provided with a mounting portion 112 to facilitate the installation of the infrared temperature sensing element 12.

[0039] Preferably, such as Figure 1As shown, the aforementioned bracket portion 110 may also be provided with a mounting groove 1112 for embedding the aforementioned mounting portion 112. The mounting groove 1112 penetrates the side wall of the bracket portion 110 along the second direction F2, and the mounting groove 1112 is open on the side of the bracket portion 110 opposite to the battery module 2. On the one hand, the mounting portion 112 is embedded in the mounting groove 1112, which not only effectively improves the limiting stability of the bracket portion 110 on the mounting portion 112 and ensures the setting position accuracy of the infrared temperature sensing element, but also effectively saves the space occupied by the mounting portion 112 in the first direction F1 and improves the space utilization rate of the battery pack. On the other hand, the mounting groove 1112 is open on one side of the bracket portion 110, which effectively simplifies the loading and unloading operation of the mounting portion 112.

[0040] Preferably, such as Figure 2 As shown, the battery module 2 may include multiple battery cells 21, which can be stacked along the second direction F2. Correspondingly, the aforementioned testing bracket 11 may also include a mounting plate 113, which is disposed between the battery module 2 and the bracket portion 110 (that is, the side of the bracket portion 110 facing away from the mounting portion 112). The side of the mounting plate 113 facing the battery module 2 is provided with multiple limiting grooves 1131, which correspond one-to-one with the battery cells 21. Thus, on the one hand, the engagement between the limiting grooves 1131 and the battery cells 21 not only effectively improves the stability of the aforementioned testing bracket 11, but also improves the tightness of the fit between the testing bracket 11 and the battery module 2; on the other hand, the design of the limiting grooves 1131 can guide the installation direction of the battery cells 21, simplify the assembly process, and improve production efficiency, which is especially suitable for high-density stacked battery cell 21 modules.

[0041] Preferably, the support portion 110 and the mounting plate 113 can be connected as a single unit to further improve the connection stability and support strength of the detection support 11.

[0042] Preferably, such as Figures 1 to 3 As shown, the battery pack may include multiple battery modules 2 and multiple testing brackets 11, with each testing bracket 11 corresponding to one of the battery modules 2. Figures 1 to 3 An example is shown where the battery pack includes two battery modules 2, arranged side-by-side along a third direction F3. Correspondingly, the number of detection brackets 11 is also two. However, this is not a limitation. The number of battery modules 2 included in the battery pack can be adaptively adjusted according to the applicable requirements of the battery pack. For example, the number of battery modules 2 can also be 1, 3, 4, 5, 6, or more. Optionally, multiple battery modules 2 can be arranged side-by-side along a third direction F3. Optionally, multiple battery modules 2 can be arranged side-by-side along a second direction F2. Optionally, multiple battery modules 2 can be distributed in a matrix.

[0043] Preferably, the mounting plate 113 can be a transparent part so that the infrared signal generated by the battery module 2 can enter the detection chamber 100.

[0044] Preferably, a first reflective layer may be provided on the inner side of the bracket portion 110, which can reflect the infrared radiation emitted by the battery cell 21, and refocus the signal that may have been scattered or lost from the bracket portion 110 onto the infrared temperature sensing element 12, thereby enhancing the intensity of the detection signal and reducing detection error.

[0045] Preferably, such as Figure 1 and Figure 2 As shown, the battery pack may also include a housing 5 and a cover plate 6 that can be fastened together to ensure the stability and safety of the environment in which the battery module 2 is located.

[0046] Preferably, such as Figure 1 and Figure 5 As shown, the housing 5 has an internal space for accommodating other components of the battery pack. The housing 5 may be provided with a partition beam 51, which extends along the third direction F3 and its two ends are respectively connected to the side walls of the housing 5 at both ends along the third direction F3, so as to divide the internal space of the housing 5 into two parts: a receiving cavity and a control cavity. The battery module 2 may be disposed in the receiving cavity, and the control device of the battery pack may be disposed in the control cavity, so as to realize the separation of the battery pack's electrical control. This not only reduces the impact of the battery module 2's heat generation on the control device, but also makes the independent setting of the control device convenient for maintenance and installation.

[0047] It should be noted that the control device of the battery pack (e.g., BMS) is an existing device in the field and will not be described in detail here.

[0048] Preferably, such as Figure 5 As shown, an overlapping beam 52 is provided on the inner side of the side wall of the aforementioned receiving cavity that is opposite to the partition beam 51 in the second direction F2. The overlapping pieces 1122 at both ends of the aforementioned mounting part 112 in the second direction F2 can overlap with the partition beam 51 and the overlapping beam 52 respectively to achieve the fixation of the aforementioned mounting part 112.

[0049] Preferably, such as Figure 5 As shown, the dimensions of the partition beam 51 and the overlapping beam 52 in the first direction F1 are both smaller than the dimensions of the side wall of the housing 5 in the first direction F1. This reduces the space occupied by the overlapping piece 1122 in the first direction F1 and improves the space utilization of the battery pack.

[0050] Preferably, such as Figure 1 , Figure 2 and Figure 4As shown, the battery module 2 is disposed on the housing 5, and the infrared temperature sensing component 1 is disposed between the cover plate 6 and the battery module 2. The portion of the cover plate 6 opposite to the detection chamber 100 is provided with a second reflective layer 61. In this way, the signal that may have been scattered or lost from the housing 5 can be refocused onto the infrared temperature sensing element 12, thereby enhancing the intensity of the detection signal and reducing the detection error.

[0051] Preferably, such as Figure 4 As shown, the cover plate 6 may also be provided with a docking slot 62, which can dock with the bracket part 110. On the one hand, this ensures the setting accuracy and stability of the cover plate 6; on the other hand, it ensures the sealing of the detection chamber 100 and reduces the probability of heat dissipation from the detection chamber 100 through the gap between the cover plate 6 and the bracket part 110.

[0052] Preferably, such as Figure 1 and Figure 2 As shown, the battery pack may further include a liquid cooling plate 3. The liquid cooling plate 3 may be disposed on the side of the battery module 2 facing away from the infrared temperature sensing component 1 in the first direction F1. On the one hand, the liquid cooling plate 3 is used to dissipate heat from the battery pack. On the other hand, by disposing of the liquid cooling plate 3 on the side of the battery module 2 facing away from the infrared temperature sensing component 1, the influence of the liquid cooling plate 3 on the temperature collected by the infrared temperature sensing component 1 can be effectively reduced.

[0053] Optionally, such as Figure 1 and Figure 2 As shown, the battery pack may also include a thermally conductive adhesive layer 4, which is disposed between the liquid cooling plate 3 and the battery module 2 to achieve bonding and fixing of the liquid cooling plate 3 and the battery module 2.

[0054] Preferably, such as Figure 1 As shown, the battery pack may also include an NTC acquisition unit 22. The NTC acquisition unit 22 is disposed on one side of the battery module 2 in the third direction F3, opposite to the infrared temperature sensing component 1 in the first direction F1. The NTC acquisition unit 22 is disposed close to the liquid cooling plate 3. In this way, by setting the NTC acquisition unit 22, the temperature of the side of the battery module 2 away from the infrared temperature sensing component 1 in the first direction F1 can be detected, ensuring the comprehensiveness of the temperature acquisition of the battery module 2.

[0055] Optionally, the NTC acquisition unit 22 may be an NTC acquisition chip.

[0056] The second aspect of this application also provides an electrical device including the battery pack described in any of the above embodiments, and thus has all the beneficial technical effects of the battery pack, which will not be repeated here.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack having a first orientation (F1), characterized in that, It includes a battery module (2) and an infrared temperature sensing component (1), wherein the infrared temperature sensing component (1) includes a detection bracket (11) and an infrared temperature sensing element (12). The detection bracket (11) is configured to form a detection chamber (100) that can cover one side of the battery module (2) in the first direction (F1). The side of the detection bracket (11) in the first direction (F1) is transparent and fits the battery module (2). The infrared temperature sensing element (12) is disposed in the detection chamber (100). The infrared temperature sensing element (12) is disposed on the other side of the detection bracket (11) away from the battery module (2) in the first direction (F1) and facing the battery module (2).

2. The battery pack according to claim 1, characterized in that, It also has a second direction (F2) perpendicular to the first direction (F1); the detection bracket (11) includes: A support portion (110) surrounds and forms the detection chamber (100). The mounting part (112) is disposed on the side of the support part (110) away from the battery module (2) in the first direction (F1), the mounting part (112) extends along the second direction (F2), the detection chamber (100) is formed open on the side where the mounting part (112) is located, and the infrared temperature sensing element (12) is fixedly disposed on the side of the mounting part (112) facing the battery module (2).

3. The battery pack according to claim 2, characterized in that, The dimension of the mounting part (112) in the second direction (F2) is larger than the dimension of the support part (110) in the second direction (F2) so that the mounting part (112) can span the support part (110) along the second direction (F2). A plurality of infrared temperature sensing elements (12) are arranged at intervals along the second direction (F2).

4. The battery pack according to claim 2, characterized in that, The support portion (110) includes a plurality of sub-frames (111), which are arranged side by side along the second direction (F2) to divide the detection chamber (100) into a plurality of sub-detection chambers (101).

5. The battery pack according to claim 2, characterized in that, The battery module (2) includes multiple battery cells (21), which are stacked along the second direction (F2); The testing bracket (11) also includes a mounting plate (113), which is disposed between the battery module (2) and the bracket part (110). The mounting plate (113) has multiple limiting grooves on the side facing the battery module (2), and the limiting grooves correspond one-to-one with the battery cell (21).

6. The battery pack according to claim 5, characterized in that, The mounting plate (113) is a transparent part; The inner side of the bracket (110) is provided with a first reflective layer.

7. The battery pack according to any one of claims 1 to 6, characterized in that, It also includes a housing (5) and a cover plate (6) that can be fastened together, the battery module (2) is disposed in the housing (5), and the infrared temperature sensing component (1) is disposed between the cover plate (6) and the battery module (2); The portion of the cover plate (6) opposite to the detection chamber (100) is provided with a second reflective layer (61).

8. The battery pack according to any one of claims 1 to 6, characterized in that, It also includes a liquid cooling plate (3), which is disposed on the side of the battery module (2) opposite to the infrared temperature sensing component (1) in the first direction (F1).

9. The battery pack according to claim 8, characterized in that, It also has a third direction (F3), and the first direction (F1), the second direction (F2) and the third direction (F3) are perpendicular to each other; the battery pack also includes an NTC acquisition unit (22), which is disposed on one side of the battery module (2) on the third direction (F3); In the first direction (F1), relative to the infrared temperature sensing component (1), the NTC acquisition unit (22) is positioned close to the liquid cooling plate (3).

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1 to 9.

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