A sensor fixing device, temperature acquisition device and battery pack

Abstract

The application provides a sensor fixing device, a temperature acquisition device and a battery pack. The sensor fixing device is used for fixing a temperature sensor. The sensor fixing device comprises a fixing frame and a shell. The fixing frame comprises a first mounting frame. An elastic part is arranged on the inner wall of the first mounting frame. The shell is arranged in the first mounting frame. The shell is used for accommodating the temperature sensor. A temperature sensing surface is arranged on the shell. The temperature sensing surface is used for being attached to the side wall of the battery cell. The temperature sensing surface is an imitation battery cell curved surface matched with the side wall of the battery cell. When the temperature sensing surface is in contact with the side wall of the battery cell, the elastic part extrudes the shell to extrude the temperature sensing surface to be attached to the side wall of the battery cell. When the temperature sensing surface is in contact with the side wall of the battery cell, the elastic part is resisted to the shell along a preset direction by the elastic force of the elastic part, so that the temperature sensing surface is tightly attached to the side wall of the battery cell. The temperature sensing surface is an imitation battery cell curved surface matched with the side wall of the battery cell. The attachment tightness of the temperature sensing surface and the side wall of the battery cell is improved, so that the temperature acquisition accuracy of the battery cell is improved.

Description

Technical Field

[0001] This application mainly relates to the field of battery technology, specifically to a sensor fixing device, a temperature acquisition device, and a battery pack. Background Technology

[0002] With economic development and technological advancements, lithium batteries, as one of the cleanest secondary energy sources, have gained widespread popularity. Lithium batteries offer advantages such as light weight, large energy storage capacity, high power output, no pollution, long lifespan, low self-discharge coefficient, and wide temperature adaptability, thus gradually gaining favor and replacing other traditional batteries in the fields of energy storage and power batteries. In battery technology, temperature sensors are often used to collect the temperature of the cells within battery modules to ensure battery safety.

[0003] However, in the existing technology, the temperature sensor has poor adhesion to the side wall of the battery cell, resulting in low accuracy of the temperature data collected from the battery cell. Summary of the Invention

[0004] This application provides a sensor fixing device, a temperature acquisition device, and a battery pack, aiming to solve the problem of low accuracy in acquiring the temperature of the battery cell in the prior art.

[0005] In a first aspect, this application provides a sensor fixing device for fixing a temperature sensor, the sensor fixing device including a fixing frame and a housing;

[0006] The fixing frame includes a first mounting frame, and the inner wall of the first mounting frame extends out with an elastic part;

[0007] The housing is located within the first mounting frame. The housing is used to house the temperature sensor. The housing has a temperature-sensing surface, which is used to fit the side wall of the battery cell. The temperature-sensing surface is a simulated curved surface of the battery cell that matches the side wall of the battery cell.

[0008] When the temperature-sensing surface comes into contact with the side wall of the battery cell, the elastic part squeezes the outer shell to press the temperature-sensing surface to adhere to the side wall of the battery cell.

[0009] Optionally, a limiting part extends out of the outer shell, and the temperature sensing surface and one end of the limiting part extending out are respectively located on both sides of the first mounting frame;

[0010] When the temperature sensing surface separates from the side wall of the battery cell, the elastic part abuts against the outer shell in a preset direction, the first mounting frame abuts against the limiting part, and the first mounting frame abuts against the outer shell in a direction opposite to the preset direction to fix the outer shell.

[0011] Optionally, the housing includes a receiving portion and a temperature sensing portion. The receiving portion is used to house a temperature sensor. One side of the temperature sensing portion is connected to the receiving portion, and the temperature sensing surface is disposed on the other side of the temperature sensing portion. The limiting portion extends out from one side of the temperature sensing portion. When the temperature sensing surface separates from the sidewall of the battery cell, the elastic portion abuts against the temperature sensing portion along the preset direction, the first mounting frame abuts against the limiting portion, and the first mounting frame abuts against the housing in a direction opposite to the preset direction to fix the housing.

[0012] Optionally, the fixing frame includes a second mounting frame located within the first mounting frame, the two outer walls of the second mounting frame being respectively connected to the two inner walls of the first mounting frame, and the receiving portion extending into the second mounting frame and slidably connected to the second mounting frame.

[0013] Optionally, the fixing frame further includes a reinforcing member, one side of which is connected to the outer wall of the second mounting frame, and the other side of which is connected to the side of the first mounting frame that abuts against the limiting portion.

[0014] Optionally, the limiting part includes a connecting rod and a stop block with one end of the connecting rod turned outward. The connecting rod extends in the opposite direction to the preset direction, and the other end of the connecting rod is connected to one side of the temperature sensing part. The side of the stop block away from the connecting rod is an inclined surface inclined to the preset direction. The first mounting frame abuts against the stop block and abuts against the outer shell in the opposite direction to the preset direction.

[0015] Optionally, the first mounting frame includes two opposing columns and a cover plate and a base plate, with the two ends of the columns respectively connected to the surface of the cover plate and the surface of the base plate. A connector is provided on the side of the base plate away from the cover plate. The connector is used to fix the mounting bracket, and the cross-section of the connector is non-circular.

[0016] Optionally, at least two limiting portions are provided on one side of the temperature sensing portion, and the at least two limiting portions are respectively located on both sides of the receiving portion.

[0017] Optionally, the receiving portion contains an epoxy resin layer, which is hollow and is used to encapsulate the temperature sensor.

[0018] Secondly, this application provides a temperature acquisition device, which includes a temperature sensor and a sensor fixing device as described in any one of the first aspects, wherein the temperature sensor is fixed inside the sensor fixing device.

[0019] Optionally, the temperature acquisition device further includes a wiring harness and a connector, with the two ends of the wiring harness connected to the temperature sensor and the connector, respectively. The connector acquires and uploads the data collected by the temperature sensor through the wiring harness.

[0020] Secondly, this application provides a battery pack, the battery pack including a plurality of battery cells, and a sensor fixing device as described in any one of the first aspects is installed between the plurality of battery cells.

[0021] This application provides a sensor fixing device, a temperature acquisition device, and a battery pack. The sensor fixing device is used to fix a temperature sensor. The sensor fixing device includes a fixing frame and a housing. The fixing frame includes a first mounting frame, and an elastic part extends out of the inner wall of the first mounting frame. The housing is located inside the first mounting frame and is used to house the temperature sensor. The housing is provided with a temperature sensing surface, which is used to fit against the side wall of the battery cell. The temperature sensing surface is a simulated curved surface of the battery cell that matches the side wall of the battery cell. When the temperature sensing surface contacts the side wall of the battery cell, the elastic part squeezes the housing to press the temperature sensing surface to adhere to the side wall of the battery cell. The sensor fixing device of this application includes a fixing frame and a housing. The fixing frame is provided with a first mounting frame, and an elastic part extends out of the inner wall of the first mounting frame. The housing houses the temperature sensor. Limiting parts and temperature sensing surfaces that match the side wall of the battery cell are respectively provided on both sides of the housing. When the temperature sensing surface contacts the side wall of the battery cell, the elastic part uses its own elastic force to hold the housing in a preset direction, so that the temperature sensing surface is tightly attached to the side wall of the battery cell. Moreover, the temperature sensing surface is a simulated battery cell curved surface that matches the side wall of the battery cell, which can improve the tightness of the contact between the temperature sensing surface and the side wall of the battery cell, thereby improving the accuracy of temperature acquisition of the battery cell. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the sensor fixing device provided in this application;

[0024] Figure 2 This is a schematic diagram of the structure of the fixing frame in one embodiment of the sensor fixing device provided in this application;

[0025] Figure 3 This is a side view of the mounting frame in one embodiment of the sensor mounting device provided in this application.

[0026] Figure 4This is a bottom view of the mounting frame in one embodiment of the sensor mounting device provided in this application.

[0027] Figure 5 This is a schematic diagram of the outer shell in one embodiment of the sensor fixing device provided in this application;

[0028] Figure 6 This is a side view of the housing structure in one embodiment of the sensor fixing device provided in this application.

[0029] Figure 7 This is a schematic diagram of the overall structure of an embodiment of the temperature acquisition device provided in this application;

[0030] Figure 8 This is a cross-sectional structural schematic diagram of an embodiment of the temperature acquisition device provided in this application;

[0031] Figure 9 This is a schematic diagram of the overall structure of a temperature acquisition device provided in this application, applied to three battery cells;

[0032] Figure 10 This is a bottom view schematic diagram of an embodiment of the temperature acquisition device provided in this application, applied to three battery cells;

[0033] Figure 11 This is a schematic diagram of a battery pack embodiment provided in this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0037] This application provides a sensor fixing device, a temperature acquisition device, and a battery pack. The sensor fixing device is used to fix a temperature sensor and includes a fixing frame and a housing. The fixing frame includes a first mounting frame, and an elastic portion extends from the inner wall of the first mounting frame. The housing is located inside the first mounting frame and is used to house the temperature sensor. The housing has a temperature-sensing surface that is used to conform to the side wall of the battery cell. The temperature-sensing surface is a curved surface that matches the side wall of the battery cell. When the temperature-sensing surface contacts the side wall of the battery cell, the elastic portion squeezes the housing to press the temperature-sensing surface to adhere to the side wall of the battery cell. Detailed descriptions follow.

[0038] Combination Figures 1 to 6This application provides a sensor fixing device 10 for fixing a temperature sensor. The sensor fixing device 10 includes a fixing frame 11 and a housing 12. Both the fixing frame 11 and the housing 12 can be made of PBT material. PBT, polybutylene terephthalate, is a polyester made by the condensation polymerization of phthalic acid and 1,4-butanediol. It is an important thermoplastic polyester and one of the five major engineering plastics. Polybutylene terephthalate is a milky white, translucent to opaque, semi-crystalline thermoplastic polyester with high heat resistance. It is not resistant to strong acids and alkalis, but is resistant to organic solvents. It is flammable and decomposes at high temperatures. Polybutylene terephthalate is widely used in automobiles, machinery, precision instrument components, electronics, textiles, and other fields. This material has excellent properties such as high heat resistance, fatigue resistance, and a low coefficient of friction.

[0039] In this embodiment, the mounting frame 11 includes a first mounting frame 110, with an elastic portion 116 extending from the inner wall of the first mounting frame 110. The elastic portion 116 can be a spring or a sheet spring. A housing 12 is located inside the first mounting frame 110. The housing 12 houses a temperature sensor and has a temperature-sensing surface 141. The temperature-sensing surface 141 is designed to conform to the sidewall of the battery cell. The temperature-sensing surface 141 is a curved surface that mimics the shape of the battery cell's sidewall. When the temperature-sensing surface 141 contacts the sidewall of the battery cell, the elastic portion 116 presses against the housing 12 to press the temperature-sensing surface 141 against the sidewall of the battery cell. The elastic portion 116 presses the temperature-sensing surface 141 against the sidewall of the battery cell, ensuring close contact between the temperature-sensing surface 141 and the sidewall of the battery cell. Furthermore, the curved surface of the temperature-sensing surface 141, which conforms to the shape of the battery cell's sidewall, improves the accuracy of the contact between the temperature-sensing surface 141 and the sidewall of the battery cell, thus improving the accuracy of temperature acquisition.

[0040] Among them, the temperature sensing surface 141 is a simulated curved surface of the battery cell that matches the side wall of the battery cell. For example, if the side wall of the battery cell is flat, then the temperature sensing surface 141 is flat; if the battery cell is a cylindrical battery cell and the side wall of the battery cell is an arc surface, then the temperature sensing surface 141 is an arc surface with the same shape as the side wall of the battery cell.

[0041] In this embodiment, a limiting part 142 extends out from the outer casing 12. When the outer casing 12 extends into the first mounting frame 110, the limiting part 142 passes through the first mounting frame 110, and the end of the temperature sensing surface 141 and the end of the limiting part 142 extending out are respectively located on both sides of the first mounting frame 110. When the temperature sensing part 14 separates from the side wall of the battery cell, the elastic part 116 abuts against the outer casing 12 in a preset direction, and the first mounting frame 110 abuts against the limiting part 142 in a direction opposite to the preset direction, thus fixing the outer casing 12. Since the outer casing 12 is held in place by the elastic part 116 within the first mounting frame 110, the elastic part 116 can press the temperature sensing surface 141 against the side wall of the battery cell, so that the temperature sensing surface 141 can make close contact with the side wall of the battery cell, improving the accuracy of temperature acquisition.

[0042] The temperature sensor can be an NTC temperature sensor. An NTC temperature sensor is a thermistor or probe whose resistance decreases rapidly as temperature rises. It typically consists of two or three metal oxides mixed in a fluid-like clay and sintered in a high-temperature furnace to form a dense, sintered ceramic. The actual size is very flexible; they can be as small as 0.010 inches or have a very small diameter.

[0043] In this embodiment, the outer casing 12 includes a receiving portion 13 and a temperature sensing portion 14. The receiving portion 13 is used to house a temperature sensor. One side of the temperature sensing portion 14 is connected to the receiving portion 13, and a temperature sensing surface 141 is disposed on the other side of the temperature sensing portion 14. A limiting portion 142 extends out from one side of the temperature sensing portion 14. When the temperature sensing portion 14 separates from the side wall of the battery cell, the limiting portion 142 and the receiving portion 13 pass through the first mounting frame 110. The elastic portion 116 abuts against the temperature sensing portion 14 in a preset direction, the first mounting frame 110 abuts against the limiting portion 142, and the first mounting frame 110 abuts against the outer casing 12 in a direction opposite to the preset direction, thus fixing the outer casing 12. Specifically, the temperature sensing portion 14 is a rectangular plate, and the corners of the temperature sensing portion 14 are chamfered.

[0044] In this embodiment of the application, the fixing frame 11 includes a second mounting frame 151 located inside the first mounting frame 110. The outer walls on both sides of the second mounting frame 151 are respectively connected to the inner walls on both sides of the first mounting frame 110. When the temperature sensing part 14 extends into the first mounting frame 110, the receiving part 13 extends into the second mounting frame 151 and is slidably connected to the second mounting frame 151.

[0045] In this embodiment, the inner wall of the second mounting frame 151 is provided with a plurality of guide ribs 153 extending in a preset direction, and the plurality of guide ribs 153 are arranged around the receiving part 13. By providing a plurality of guide ribs 153, the receiving part 13 can be guided to pass through the inner wall of the second mounting frame 151.

[0046] In this embodiment, the fixing frame 11 further includes a reinforcing member 152, which connects the outer wall of the second mounting frame 151 and one side of the first mounting frame 110 abutting the limiting part 142. One side of the reinforcing member 152 is connected to the outer wall of the second mounting frame 151, and the other side is connected to one side of the first mounting frame 110 abutting the limiting part 142. Specifically, the reinforcing member 152 is a right-angled reinforcing plate, and there are four reinforcing members 152, which are respectively disposed on both sides of the second mounting frame 151. By providing the reinforcing members 152, the strength of the fixing frame 11 can be improved.

[0047] In this embodiment, the limiting part 142 includes a connecting rod 143 and a stop 144 with one end of the connecting rod 143 turned outward. The connecting rod 143 extends in the opposite direction to a preset direction, and the other end of the connecting rod 143 is connected to one side of the temperature sensing part 14. The side of the stop 144 away from the connecting rod 143 is an inclined surface in the preset direction. The first mounting frame 110 abuts against the stop 144 and abuts against the outer shell 12 in the opposite direction to the preset direction. When the temperature sensing part 14 extends into the first mounting frame 110, the limiting part 142 and the receiving part 13 pass through the first mounting frame 110, and the stop 144 on the limiting part 142 passes through the first mounting frame 110 under the guidance of its inclined surface. The side of the stop 144 away from the connecting rod 143 is an inclined surface in the preset direction, which facilitates the passing of the limiting part 142 through the first mounting frame 110.

[0048] In this embodiment, the first mounting frame 110 includes two opposing columns 112 and opposing cover plate 111 and base plate 113. The two ends of the columns 112 are respectively connected to the surfaces of the cover plate 111 and the base plate 113. A connector 115 protrudes from the side of the base plate 113 away from the cover plate 111. The connector 115 is used to fix the mounting bracket 11, and its cross-section is non-circular. Because the connector 115 has a non-circular cross-section, it can be inserted into a preset position on the mounting bracket 11, fixing the mounting bracket 11 in the preset position and preventing rotation of the mounting bracket 11.

[0049] In one specific embodiment, the battery cell is a cylindrical battery cell with a curved sidewall, and the temperature sensing surface 141 is a curved surface with the same shape as the sidewall of the battery cell. Specifically, the cover plate 111 includes three side edges, each of which is a curved surface with the same shape as the sidewall of the battery cell.

[0050] In this embodiment, at least two limiting portions 142 are provided on one side of the temperature sensing part 14, and the at least two limiting portions 142 are respectively located on both sides of the receiving part 13. Specifically, four limiting portions 142 are provided on one side of the temperature sensing part 14, and the four limiting portions 142 are respectively located on both sides of the receiving part 13.

[0051] For further details, please refer to [link / reference]. Figure 7 and Figure 8 This application also provides a temperature acquisition device, which includes a temperature sensor 23 and a sensor fixing device 10 in any of the above embodiments, wherein the temperature sensor 23 is fixed inside the sensor fixing device 10.

[0052] Furthermore, the temperature acquisition device also includes a wiring harness 21 and a connector 22. The two ends of the wiring harness 21 are connected to the temperature sensor 23 and the connector 22, respectively. The connector 22 acquires and uploads the data collected by the temperature sensor 23 through the wiring harness 21. The wiring harness 21 and connector 22 are used to transmit signals. The wiring harness 21 adopts a double-parallel structure stacked vertically, which reduces the space occupied by the wiring harness 21 and facilitates its placement among the battery cells. The length of the wiring harness 21 can be adjusted according to the placement position of the temperature sensor 23 and the module length, which is beneficial for acquiring the temperature of any battery cell in the entire module.

[0053] Furthermore, the housing 13 contains an epoxy resin layer 24, which is hollow and serves to encapsulate the temperature sensor 23. The epoxy resin layer 24 encapsulates the temperature sensor 23, thus protecting it.

[0054] For further details, please refer to [link / reference]. Figure 9 and Figure 10 Taking three battery cells 30 as an example, in a specific embodiment, the battery cell 30 is a cylinder with an arc surface. The temperature sensing surface 141 is an arc surface with the same curvature as the surface of the battery cell 30, meaning the curvature of the temperature sensing surface 141 is the same as the curvature of the surface of the battery cell 30, allowing for complete fit. Both the cover plate 111 and the base plate 113 include three side edges, each of which is an arc surface with the same curvature as the surface of the battery cell 30. When the sensor fixing device 10 is placed in the gap formed by the three battery cells 30, the temperature sensing surface 141 is in contact with the side wall of one of the battery cells 30, and the three side edges of the cover plate 111 and the bottom plate 113 are in contact with the side walls of the three battery cells 30 respectively. This greatly reduces the volume of the gap, and it is even possible to make the side walls of the three battery cells 30 fit together in sequence without having to leave space for the sensor fixing device 10. Then the sensor fixing device 10 can be placed in the gap between the three battery cells 30. This greatly reduces the overall volume of the battery pack, thereby providing a strong guarantee for improving the battery energy density.

[0055] For further details, please refer to [link / reference]. Figure 11 This application also provides a battery pack 100, which includes a plurality of battery cells 30, and a sensor fixing device 10 of any of the above-mentioned methods is installed between the plurality of battery cells 30. Specifically, the battery pack 100 includes a battery plate 40, and a plurality of battery cells 30 are arrayed on the battery plate 40. The battery plate 40 is provided with positioning holes that match the connector 115, and the sensor fixing device 10 is inserted into the positioning holes on the battery plate 40 through the connector 115.

[0056] This application provides a sensor fixing device, a temperature acquisition device, and a battery pack. The sensor fixing device is used to fix a temperature sensor. The sensor fixing device includes a fixing frame and a housing. The fixing frame includes a first mounting frame, and an elastic part extends out of the inner wall of the first mounting frame. The housing is located inside the first mounting frame and is used to house the temperature sensor. The housing is provided with a temperature sensing surface, which is used to fit against the side wall of the battery cell. The temperature sensing surface is a simulated curved surface of the battery cell that matches the side wall of the battery cell. When the temperature sensing surface contacts the side wall of the battery cell, the elastic part squeezes the housing to press the temperature sensing surface to adhere to the side wall of the battery cell. The sensor fixing device of this application includes a fixing frame and a housing. The fixing frame is provided with a first mounting frame, and an elastic part extends out of the inner wall of the first mounting frame. The housing houses the temperature sensor. Limiting parts and temperature sensing surfaces that match the side wall of the battery cell are respectively provided on both sides of the housing. When the temperature sensing surface contacts the side wall of the battery cell, the elastic part uses its own elastic force to hold the housing in a preset direction, so that the temperature sensing surface is tightly attached to the side wall of the battery cell. Moreover, the temperature sensing surface is a simulated battery cell curved surface that matches the side wall of the battery cell, which can improve the tightness of the contact between the temperature sensing surface and the side wall of the battery cell, thereby improving the accuracy of temperature acquisition of the battery cell.

[0057] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sensor fixing device, characterized in that, The sensor fixing device is used to fix the temperature sensor, and the sensor fixing device includes a fixing frame and a housing; The fixing frame includes a first mounting frame, and the inner wall of the first mounting frame extends out with an elastic part; The housing is located within the first mounting frame. The housing is used to house the temperature sensor. The housing has a temperature-sensing surface, which is used to fit the side wall of the battery cell. The temperature-sensing surface is a simulated curved surface of the battery cell that matches the side wall of the battery cell. The housing includes a receiving part and a temperature sensing part. The receiving part is used to house the temperature sensor. One side of the temperature sensing part is connected to the receiving part. The temperature sensing surface is disposed on the other side of the temperature sensing part. A limiting part extends out from one side of the temperature sensing part. The end of the temperature sensing surface and the end of the limiting part are respectively located on both sides of the first mounting frame. When the temperature sensing surface comes into contact with the side wall of the battery cell, the elastic part squeezes the outer shell to press the temperature sensing surface to adhere to the side wall of the battery cell; When the temperature sensing surface separates from the side wall of the battery cell, the elastic part abuts against the temperature sensing part in a preset direction, the first mounting frame abuts against the limiting part, and the first mounting frame abuts against the outer shell in a direction opposite to the preset direction to fix the outer shell.

2. The sensor fixing device according to claim 1, characterized in that, The fixing frame includes a second mounting frame located within the first mounting frame. The outer walls on both sides of the second mounting frame are respectively connected to the inner walls on both sides of the first mounting frame. The receiving portion extends into the second mounting frame and is slidably connected to the second mounting frame.

3. The sensor fixing device according to claim 2, characterized in that, The fixing frame also includes a reinforcing member, one side of which is connected to the outer wall of the second mounting frame, and the other side of which is connected to the side of the first mounting frame that abuts against the limiting part.

4. The sensor fixing device according to any one of claims 1-3, characterized in that, The limiting part includes a connecting rod and a stop block with one end of the connecting rod turned outward. The connecting rod extends in the opposite direction to the preset direction. The other end of the connecting rod is connected to one side of the temperature sensing part. The side of the stop block away from the connecting rod is an inclined surface inclined to the preset direction. The first mounting frame abuts against the stop block and abuts against the outer shell in the opposite direction to the preset direction.

5. The sensor fixing device according to claim 4, characterized in that, The first mounting frame includes two opposing columns and a cover plate and a base plate. The two ends of the columns are respectively connected to the surface of the cover plate and the surface of the base plate. A connector is protruding on the side of the base plate away from the cover plate. The connector is used to fix the mounting bracket. The cross-section of the connector is non-circular.

6. The sensor fixing device according to claim 5, characterized in that, At least two limiting portions are provided on one side of the temperature sensing part, and the at least two limiting portions are respectively located on both sides of the receiving part.

7. The sensor fixing device according to claim 4, characterized in that, The receiving part contains an epoxy resin layer, which is hollow and is used to encapsulate the temperature sensor.

8. A temperature acquisition device, characterized in that, The temperature acquisition device includes a temperature sensor and a sensor fixing device as described in any one of claims 1-7, wherein the temperature sensor is fixed inside the sensor fixing device.

9. The temperature acquisition device according to claim 8, characterized in that, The temperature acquisition device also includes a wiring harness and a connector. The two ends of the wiring harness are connected to the temperature sensor and the connector, respectively. The connector acquires the data collected by the temperature sensor through the wiring harness and uploads it.

10. A battery pack, characterized in that, The battery pack includes multiple battery cells, and a sensor fixing device as described in any one of claims 1-7 is installed between the multiple battery cells, or the battery pack includes a temperature acquisition device as described in claim 8 or 9.

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