A comprehensive detection device for battery temperature of an electric vehicle

Abstract

The application belongs to the technical field of battery detection, and discloses a kind of comprehensive detection device for temperature of electric vehicle battery, including detection general control module and outside temperature detection mechanism, the two sides of detection general control module are symmetrically equipped with assembly component, and the assembly component is symmetrically distributed between adjacent battery modules, and the assembly component is elastically connected with elastic support between the upper and lower assembly components.The gap temperature detection mechanism located in the gap between adjacent batteries cooperates with the outside temperature detection mechanism on the outer surface of the battery module, achieving multi-dimensional comprehensive monitoring of the battery temperature field, and the elastic support with the temperature sensing plate is placed in the core hot zone between adjacent batteries, thereby simultaneously obtaining the macro surface temperature and the key gap internal temperature.Compared with the traditional point type temperature measurement, it can more comprehensively and more truly reflect the temperature field distribution of the entire battery pack, effectively avoiding the missed detection of local overheating points.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of battery detection, and specifically relates to a comprehensive detection device for the temperature of a battery of an electric vehicle. BACKGROUND

[0002] As an important development direction for replacing traditional fuel vehicles, the safety and performance of the power battery pack, which is the core component of the electric vehicle, are crucial. The working performance, service life and safety of the lithium ion battery, which is the current mainstream power battery, are closely related to the temperature. In the charging and discharging process, heat will inevitably be generated inside the battery, and the temperature of the battery usually needs to be detected and processed.

[0003] However, the existing battery temperature detection device for the electric vehicle still has technical challenges in detection.

[0004] First, the temperature monitoring points are sparse, and the temperature field distribution of the battery pack cannot be fully reflected. Currently, temperature sensors are arranged in some areas of the battery module, which cannot adapt to the complex temperature distribution inside the battery pack. Due to factors such as structure, assembly and uneven cooling, the temperatures at different positions inside the battery pack often have significant differences. Only with limited point data, the real thermal state of the entire battery pack cannot be accurately evaluated, and there is a serious safety hazard.

[0005] Second, there is a lack of direct monitoring of the temperature of the key micro-environment such as the cell gap. The narrow gap between the battery modules has the problem of internal heat accumulation, and the temperature inside the gap is often higher than the surface temperature, which can actually more truly reflect the battery state. However, the traditional detection method cannot achieve comprehensive monitoring, and the dynamic perception ability of the temperature gradient is insufficient, so the comprehensive detection effect is not good. SUMMARY

[0006] The purpose of the present application is to provide a comprehensive detection device for the temperature of a battery of an electric vehicle to solve the problems raised in the background.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a kind of electric vehicle battery temperature comprehensive detection device, including detection general control module and outer temperature detection mechanism, the two sides of the detection general control module are symmetrically equipped with assembly component, the assembly component is symmetrically distributed between adjacent battery modules, and elastic support is elastically connected between the upper and lower two assembly components, the two side surfaces of the elastic support are nested with gap temperature detection mechanism, the gap temperature detection mechanism is electrically connected with detection general control module, the inside of the assembly component is equipped with thermal driving mechanism, and the position of elastic support is controlled by the thermal driving mechanism absorbing battery module temperature, the inside of the upper and lower two assembly components is equipped with auxiliary magnetic control mechanism, and the two auxiliary magnetic control mechanisms are symmetrically arranged about the center point of elastic support, and the elastic support between the upper and lower two auxiliary magnetic control mechanisms is controlled to swing between adjacent battery modules, and height sensor is arranged on the two side surfaces of the elastic support.

[0008] Preferably, the outer temperature detection mechanism is electrically connected with the detection general control module, the outer temperature detection mechanism corresponds to the battery module one by one, and the outer temperature detection mechanism is attached to the battery module.

[0009] Preferably, the assembly component includes an assembly frame, an auxiliary frame and a support rod, the auxiliary frame is symmetrically connected to the two sides of the assembly frame, one end of the support rod is fixedly connected with one auxiliary frame, and the other end of the support rod is fixedly connected with the detection general control module.

[0010] Preferably, the thermal driving mechanism includes a main air bag, a side air bag, a push rod and a magnetic block two, the main air bag is sleeved in the inside of the assembly frame, and one end of the main air bag is fixed in the assembly frame, the side air bag is nested in the inside of the auxiliary frame, the side air bag is communicated and arranged on the two sides of the main air bag, the push rod is movably sleeved at the bottom of the assembly frame, one end of the push rod is fixedly connected with the main air bag, and the other end of the push rod is fixedly connected with the magnetic block two.

[0011] Preferably, the elastic support includes an assembly plate, a magnetic sheet and a spring, the magnetic sheet is fixedly nested on the upper and lower surfaces of the assembly plate, one end of the spring is fixedly connected with the magnetic sheet, and the other end of the spring is fixedly connected with the assembly frame.

[0012] Preferably, the gap temperature detection mechanism includes a temperature sensing plate and a temperature sensing wire, one end of the temperature sensing wire is electrically connected with the temperature sensing plate, the other end of the temperature sensing wire is electrically connected with the detection general control module, and the temperature sensing plate is fixedly nested on the front surface of the assembly plate.

[0013] Preferably, the auxiliary magnetic control mechanism includes an electric push rod and a magnetic block one, the free end of the electric push rod is fixedly connected with the magnetic block one, and the magnetic block one repels and pushes the magnetic sheet to move when the magnetic block one is close to the magnetic sheet.

[0014] Preferably, the outside of the detection general control module is provided with a ventilation assembly, and the inside of the elastic support is provided with a purging air channel, and the ventilation assembly is used for inputting airflow into the purging air channel.

[0015] Preferably, the ventilation assembly comprises a wind tube, a fan, an air guide pipe and a distribution frame, the wind tube and the distribution frame are both fixed on the detection general control module, the air guide pipe is in communication and arranged between the wind tube and the distribution frame, and the fan is arranged in the wind tube.

[0016] Preferably, the purging air channel comprises an internal cavity and a purging opening, the internal cavity is opened in the inside of the assembly plate, the purging opening is opened on the front and back surfaces of the assembly plate, the purging opening is in communication with the internal cavity, one end of the assembly plate is fixedly connected with a ventilation pipe, one end of the ventilation pipe is in communication with the internal cavity, and the other end of the ventilation pipe is in communication with the distribution frame.

[0017] The present application has the following advantages:

[0018] (1) The present application realizes multi-dimensional comprehensive monitoring of the battery temperature field by the gap temperature detection mechanism located in the gap between adjacent batteries and the outside temperature detection mechanism on the outer surface of the battery module, and places the elastic support with a temperature sensing plate in the core hot area between adjacent batteries, so that the macro surface temperature and the key internal temperature of the gap are obtained at the same time, compared with the traditional point type temperature measurement, the temperature field distribution of the whole battery pack can be more comprehensively and more truly reflected, and the missed detection of local overheating points is effectively avoided.

[0019] (2) The present application realizes direct and real-time sensing of the vertical temperature gradient between the battery modules by using the passive thermal driving mechanism, and specifically converts the temperature difference between the upper and lower ends of the battery module into the height change of the elastic support through the differential displacement of the thermal driving mechanism by using the principle of thermal expansion and contraction of gas, so that the vertical temperature imbalance between the battery modules can be directly and sensitively reflected, and guidance for more fine temperature equalization control and early thermal runaway warning is provided.

[0020] (3) The present application realizes fine detection of the gap area between the batteries and precise active heat dissipation by the cooperation of the active auxiliary magnetic control mechanism and the purging air channel, on the one hand, the elastic support is actively deflected and swept, so that it can detect the temperature at different positions in the gap, and the temperature detection range is further improved, on the other hand, the air cooling airflow is input to the deflectable elastic support, when abnormal overheating is detected, in-situ and precise forced air cooling can be immediately carried out, and the response speed and efficiency of the system in response to local overheating risk are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The structure of the present application is shown in the figure;

[0022] Figure 2 The connection diagram of the assembly and the detection general control module of the present application;

[0023] Figure 3 The connection diagram of the assembly and the elastic support of the present application;

[0024] Figure 4 The cross-sectional view of the elastic support of the present application;

[0025] Figure 5 The cross-sectional view of the assembly and the thermal driving mechanism of the present application;

[0026] Figure 6 The cross-sectional view of the assembly plate and the gap temperature detection mechanism of the present application;

[0027] Figure 7 The Figure 6 The enlarged structural diagram of A in the middle;

[0028] Figure 8 The explosion diagram of the ventilation assembly of the present application.

[0029] In the figure: 1, detection general control module; 2, outside temperature detection mechanism; 3, assembly; 301, assembly frame; 302, auxiliary frame; 303, support rod; 4, elastic support; 401, assembly plate; 402, magnetic sheet; 403, spring; 5, gap temperature detection mechanism; 501, temperature sensing plate; 502, temperature sensing wire; 6, auxiliary magnetic control mechanism; 601, electric push rod; 602, magnetic block one; 7, purge airway; 701, internal cavity; 702, purge port; 8, ventilation pipe; 9, thermal driving mechanism; 901, main air bag; 902, side air bag; 903, push rod; 904, magnetic block two; 10, ventilation assembly; 101, air cylinder; 102, fan; 103, air guide pipe; 104, distribution frame. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] As Figures 1 to 8As shown, the embodiment of the present application provides a kind of comprehensive detection device of electric vehicle battery temperature, including detection total control module 1 and outer temperature detection mechanism 2, detection total control module 1 two sides symmetry is equipped with assembly component 3, assembly component 3 upper and lower symmetry distribution between adjacent battery module, elastic support 4 is elastically connected between the upper and lower two assembly components 3, the two side surfaces of elastic support 4 are nested with gap temperature detection mechanism 5, gap temperature detection mechanism 5 is electrically connected with detection total control module 1, the inside of assembly component 3 is equipped with thermal driving mechanism 9, and the position of elastic support 4 is controlled by the temperature of battery module and the upper and lower thermal driving mechanism 9, the inside of the upper and lower two assembly components 3 is equipped with auxiliary magnetic control mechanism 6, and the two auxiliary magnetic control mechanisms 6 are symmetrically arranged about the center point of elastic support 4, and the elastic support 4 between the upper and lower two auxiliary magnetic control mechanisms 6 is controlled to swing between adjacent battery modules, and the two side surfaces of elastic support 4 are equipped with height sensor (for existing Honeywell LC series micro linear displacement sensor).

[0032] Example 1: in the process of battery operation, the thermal driving mechanism 9 in the inside of the upper and lower two assembly components 3 absorbs heat from the upper and lower ends of battery module through the side air bag 902 of the thermal driving mechanism 9, the gas in the side air bag 902 expands by heating, pushes the main air bag 901 to expand, and then makes the push rod 903 extend, because the temperature of the upper and lower ends of battery module may be different (that is, there is vertical temperature gradient), the gas expansion degree of the upper and lower two thermal driving mechanisms 9 will also be different, which will cause the difference of the extension displacement of the two push rods 903, and the magnetic block two 904 at the bottom of the two push rods 903 and the magnetic sheet 402 at the upper and lower ends of the elastic support 4 exist magnetic repulsion, and the difference of displacement will cause the imbalance of the upper and lower magnetic repulsion, so that the elastic support 4 originally in horizontal state occurs slight displacement in vertical direction, and the height sensor on the elastic support 4 detects the displacement in real time, and the height change value directly and quantitatively reflects the size of vertical temperature gradient between adjacent battery modules.

[0033] Wherein, the outer temperature detection mechanism 2 is electrically connected with the detection total control module 1, the outer temperature detection mechanism 2 corresponds to the battery module one by one, and the outer temperature detection mechanism 2 is attached to the battery module.

[0034] The built-in existing Honeywell 192-502LET-A01 (thin film NTC temperature probe) in the outer temperature detection mechanism 2 is attached to the surface of the battery by adhesive method, and large-area surface temperature measurement is carried out.

[0035] The outer temperature detection mechanism 2 is installed on the outside of the battery module, the outer side surface temperature of the battery module under contact is detected, and the detection data is input into the detection total control module 1.

[0036] The assembly component 3 comprises an assembly frame 301, an auxiliary frame 302 and a support rod 303, the auxiliary frame 302 is symmetrically connected on both sides of the assembly frame 301, one end of the support rod 303 is fixedly connected with one auxiliary frame 302, and the other end of the support rod 303 is fixedly connected with the detection general control module 1, the thermal driving mechanism 9 comprises a main air bag 901, a side air bag 902, a push rod 903 and a magnetic block two 904, the main air bag 901 is sleeved in the interior of the assembly frame 301, and one end of the main air bag 901 is fixed in the assembly frame 301, the side air bag 902 is nested in the interior of the auxiliary frame 302, the side air bag 902 is communicatively arranged on both sides of the main air bag 901, the push rod 903 is movably sleeved at the bottom of the assembly frame 301, one end of the push rod 903 is fixedly connected with the main air bag 901, and the magnetic block two 904 is fixed on the other end of the push rod 903.

[0037] The assembly component 3 is assembled by using the thermal driving mechanism 9, and the whole is supported by being fixedly connected with the detection general control module 1, the support rod 303 is maintained by being fixedly connected, the assembly component 3 is stably arranged between adjacent battery modules, the main air bag 901 in the thermal driving mechanism 9 is sleeved in the assembly frame 301, and only one end is fixedly connected in the interior of the assembly frame 301, so that the main air bag 901 can be fully inflated, the side air bag 902 is nested in the auxiliary frame 302 and is limited from being inflated, and the side air bag 902 is used for being in communication with the main air bag 901, the contact area with the battery end part is enlarged by the auxiliary frame 302, a larger area of heat of the battery end part is absorbed, and the volume is diffused by the gas filled in the side air bag 902, so that the inflated main air bag 901 is oriented to expand, and the main air bag 901 is used to drive the push rod 903 and the magnetic block two 904 to move, when the battery end part generates high heat, the thermal driving mechanism 9 absorbs more heat, the displacement of the push rod 903 after inflation is large, and the displacement of the magnetic block two 904 is also large, the thermal driving mechanism 9 distributed upward and downward respectively senses the temperature difference between the upper and lower parts of the adjacent battery end part region, the magnetic block two 904 located on the upper and lower parts of the elastic support 4 has different displacement amounts, the repulsion strength on the upper and lower parts of the elastic support 4 is different under different displacement amounts, the elastic support 4 is offset to different degrees upward and downward, and the height sensor on the elastic support 4 senses the height change, the temperature difference between the upper and lower parts of the battery module end part is evaluated and judged according to the height change difference, the greater the height displacement amount is, the greater the temperature difference between the upper and lower parts of the battery end part is, and then the temperature difference detection of the adjacent battery end part region is realized.

[0038] The elastic support 4 comprises an assembly plate 401, a magnetic sheet 402 and a spring 403, the magnetic sheet 402 is symmetrically fixedly nested on the upper and lower surfaces of the assembly plate 401, one end of the spring 403 is fixedly connected with the magnetic sheet 402, and the other end of the spring 403 is fixedly connected with the assembly frame 301.

[0039] The elastic support 4 is elastically connected by the upper and lower springs 403. When there is no temperature difference between the upper and lower areas, the magnetic repulsion forces on the upper and lower sides are the same, and there is no displacement difference. When the temperature difference between the upper and lower areas is large, the magnetic thrusts on the upper and lower sides are different, so that the elastic support 4 is displaced. The spring 403 facilitates adaptive displacement on one hand and facilitates elastic reset on the other hand, automatically calibrates the initial position, and the magnetic sheet 402 and the magnetic block two 904 generate relative repulsion, and the position far and near changes the repulsion size.

[0040] The gap temperature detection mechanism 5 includes a temperature sensing plate 501 and a temperature sensing wire 502. One end of the temperature sensing wire 502 is electrically connected with the temperature sensing plate 501, and the other end of the temperature sensing wire 502 is electrically connected with the detection general control module 1. The temperature sensing plate 501 is fixedly nested on the front surface of the assembly plate 401.

[0041] The temperature sensing plate 501 is an existing temperature sensing element, and the specific model is Murata NCP15XH103F03RC (NTC 10kΩ, 0603), which is suitable for battery adhesion detection.

[0042] The gap temperature detection mechanism 5 realizes contact detection of the adjacent battery module end portions through the temperature sensing plate 501 and the temperature sensing wire, and transmits the detection information to the detection general control module 1.

[0043] The auxiliary magnetic control mechanism 6 includes an electric push rod 601 and a magnetic block one 602. The free end of the electric push rod 601 is fixedly connected with the magnetic block one 602. When the magnetic block one 602 is close to the magnetic sheet 402, it repels and pushes the magnetic sheet 402 to move.

[0044] In embodiment 2, when it is necessary to perform more fine temperature distribution scanning on the battery module gap, the detection general control module 1 starts the auxiliary magnetic control mechanism 6. The two groups of symmetrically distributed electric push rods 601 drive the magnetic block one 602 to move synchronously. The magnetic block one 602 located on the right side of the upper part of the elastic support 4 moves downward, and the magnetic block one 602 located on the left side of the lower part of the elastic support 4 moves upward. Through the magnetic repulsion force between the magnetic block one 602 and the magnetic sheet 402 on the elastic support 4, the magnetic force is pushed, and the force moment is generated on the elastic support 4, so that the elastic support 4 is deflected and swings around the center point thereof. With the deflection of the elastic support 4, the temperature sensing plates 501 of the gap temperature detection mechanisms 5 on the two sides thereof slide and scan on the side wall of the battery module in a small range, so as to obtain the temperature data at different heights or positions in the gap, and complete the fine detection of the temperature field in the gap.

[0045] The auxiliary magnetic control mechanism 6 is specifically distributed on the upper and lower parts of the adjacent battery modules, that is, on the upper and lower sides of the elastic support 4, and the further upper and lower distributed auxiliary magnetic control mechanisms 6 are also distributed symmetrically in space, the magnetic block one 602 is controlled to be close to the elastic support 4 by the electric push rod 601, and the elastic support 4 is pushed to move by using the repulsive thrust of the magnetic block one 602 on the magnetic sheet 402, and the elastic support 4 is pushed to make a deflection movement in the central region under the action of the torque constructed by the synchronous starting control of the two groups of auxiliary magnetic control mechanisms 6 symmetrically at the center, so that the elastic support 4 assembled with the gap temperature detection mechanism 5 changes the contact area with the end part of the battery module under deflection, thereby realizing the contact temperature detection of each region of the end part and further acquiring the battery temperature.

[0046] The outer side of the detection master control module 1 is provided with a ventilation assembly 10, and the inside of the elastic support 4 is provided with a blowing air channel 7, and the ventilation assembly 10 is used for inputting airflow into the blowing air channel 7.

[0047] By inputting airflow into the blowing air channel 7 through the ventilation assembly 10, the adjacent battery gap is specially blown and cooled through the blowing air channel 7 in the elastic support 4, so as to avoid that the temperature between the adjacent battery modules is too high, and realize targeted heat dissipation after comprehensive detection.

[0048] And the deflection control of the elastic support 4 by the auxiliary magnetic control mechanism 6 6 makes the blowing air channel 7 on the elastic support 4 follow the deflection, dynamically change the blowing direction, and realize further comprehensive blowing and cooling between the adjacent battery modules.

[0049] The ventilation assembly 10 includes a wind cylinder 101, a fan 102, an air guide pipe 103 and a distribution frame 104, the wind cylinder 101 and the distribution frame 104 are fixed on the detection master control module 1, the air guide pipe 103 is communicated and arranged between the wind cylinder 101 and the distribution frame 104, and the fan 102 is arranged in the wind cylinder 101.

[0050] The ventilation assembly 10 realizes airflow guiding through the wind cylinder 101, the air guide pipe 103 and the distribution frame 104, and the fan 102 provides flowing airflow, and other injection fans or micro air pumps can also be used as the air source.

[0051] The blowing air channel 7 includes an internal cavity 701 and a blowing port 702, the internal cavity 701 is opened in the inside of the assembly plate 401, the blowing port 702 is opened on the front and back surfaces of the assembly plate 401, the blowing port 702 is communicated with the internal cavity 701, one end of the air pipe 8 is fixedly connected with the assembly plate 401, one end of the air pipe 8 is communicated with the internal cavity 701, and the other end of the air pipe 8 is communicated with the distribution frame 104.

[0052] When the detection general control module 1 judges that there is a local overheating risk in the gap between one or several battery modules according to the collected multi-dimensional temperature data, the ventilation assembly 10 is started, the fan 102 generates airflow, the airflow is transported into the corresponding elastic support 4 through the air guide pipe 103 and the distribution frame 104, and the airflow is finally blown out from the blowing port 702 on both sides of the elastic support 4, so that the battery module gap with high temperature is subjected to targeted and active forced air cooling, and the dynamic and all-round blowing and heat dissipation of the gap area are further completed in combination with the active scanning action.

[0053] The airflow in the distribution frame 104 is guided into the internal cavity 701 through the ventilation pipe 8 and blown to the adjacent battery module gap area through the blowing port 702, so that the auxiliary blowing and cooling are completed, and the detected abnormal battery temperature can be cooled in time.

[0054] The working principle and use process of the application are as follows:

[0055] Multi-dimensional temperature information collection

[0056] The device is installed in the battery pack, and a plurality of assembly components 3 are located between adjacent battery modules.

[0057] The external temperature detection mechanism 2 fixed on the surface of each battery module measures and uploads the macroscopic surface temperature of each battery module to the detection general control module 1 in real time; the temperature sensing plate 501 of the gap temperature detection mechanism 5 on both sides of the elastic support 4 in the gap between adjacent battery modules is tightly attached to the side wall of the battery module, and the core temperature inside the gap is measured and uploaded in real time;

[0058] Thermal expansion-based passive sensing of temperature gradient

[0059] In the battery operation process, the thermal driving mechanism 9 in the upper and lower assembly components 3 absorbs heat from the upper and lower ends of the battery module through the side air bag 902, the gas in the side air bag 902 expands to drive the main air bag 901 to expand, and then the push rod 903 extends, because the temperature at the upper and lower ends of the battery module may be different (that is, there is a vertical temperature gradient), the gas expansion degree of the upper and lower thermal driving mechanisms 9 will also be different, which will cause the difference in the extension displacement of the two push rods 903, and the magnetic block two 904 at the bottom of the two push rods 903 and the magnetic sheet 402 at the upper and lower ends of the elastic support 4 have magnetic repulsion, and the difference in displacement will cause the imbalance of the upper and lower magnetic repulsion, so that the originally horizontal elastic support 4 is vertically displaced slightly, and the height change value is detected by the height sensor thereon in real time, which directly and quantitatively reflects the size of the vertical temperature gradient between adjacent battery modules.

[0060] Active scanning multi-point temperature detection

[0061] When a more detailed temperature distribution scan of the battery module gap is required, the detection master control module 1 will start the auxiliary magnetic control mechanism 6, and the two sets of symmetrically distributed electric push rods 601 will drive the magnetic block one 602 to move synchronously. The magnetic block one 602 on the right side of the upper part of the elastic support 4 moves downward, and the magnetic block one 602 on the left side of the lower part of the elastic support 4 moves upward. Through the magnetic repulsion force between the magnetic block one 602 and the magnetic sheet 402 on the elastic support 4, the magnetic force is pushed, and the force will generate a torque on the elastic support 4, causing it to deflect and swing around its center point. As the elastic support 4 deflects, the temperature sensing plate 501 of the gap temperature detection mechanism 5 on its two sides will slide and scan a small range on the side wall of the battery module, thereby obtaining temperature data at different heights or positions in the gap, and achieving fine detection of the temperature field in the gap.

[0062] Active heat dissipation and cooling

[0063] When the detection master control module 1 determines that there is a local overheating risk in one or more battery module gaps based on the collected multi-dimensional temperature data, it starts the ventilation assembly 10, and the fan 102 generates airflow, which is delivered to the corresponding elastic support 4 through the air guide pipe 103 and the distribution frame 104. The airflow is finally blown out from the blowout port 702 on both sides of the elastic support 4, and the high-temperature battery module gap is subjected to targeted and active forced air cooling. Combined with the active scanning action described above, the dynamic and all-around blowing and heat dissipation of the gap area are further completed.

[0064] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A comprehensive detection device for the temperature of an electric vehicle battery, comprising a central control module (1) and an external temperature detection mechanism (2), characterized in that: The detection control module (1) is symmetrically provided with assembly components (3) on both sides. The assembly components (3) are symmetrically distributed between adjacent battery modules. The upper and lower sets of assembly components (3) are elastically connected by elastic support members (4). The two sides of the elastic support members (4) are nested with gap temperature detection mechanisms (5). The gap temperature detection mechanisms (5) are electrically connected to the detection control module (1). The assembly components (3) are provided with thermal pushing mechanisms (9). The upper and lower thermal pushing mechanisms (9) absorb the temperature of the battery modules and control the position of the elastic support members (4). The inner sides of the upper and lower sets of assembly components (3) are provided with auxiliary magnetic control mechanisms (6). The two auxiliary magnetic control mechanisms (6) are symmetrically arranged about the center point of the elastic support members (4). The upper and lower sets of auxiliary magnetic control mechanisms (6) control the elastic support members (4) between adjacent battery modules to deflect and swing. The two sides of the elastic support members (4) are provided with height sensors. The assembly component (3) includes an assembly frame (301), an auxiliary frame (302), and a support rod (303). The auxiliary frame (302) is symmetrically connected to both sides of the assembly frame (301). One end of the support rod (303) is fixedly connected to an auxiliary frame (302), and the other end of the support rod (303) is fixedly connected to the detection control module (1). The thermal drive mechanism (9) includes a main airbag (901), a side airbag (902), a push rod (903), and a second magnetic block (904). The main airbag (901) is sleeved inside the assembly frame (301), and one end of the main airbag (901) is fixed in the assembly frame (301). The side airbag (902) is nested inside the auxiliary frame (302), and the side airbag (902) is connected to both sides of the main airbag (901). The push rod (903) is movably sleeved on the bottom of the assembly frame (301), and one end of the push rod (903) is fixedly connected to the main airbag (901). The second magnetic block (904) is fixed on the other end of the push rod (903). The elastic support (4) includes an assembly plate (401), a magnetic sheet (402) and a spring (403). The magnetic sheet (402) is symmetrically and fixedly nested on the upper and lower surfaces of the assembly plate (401). One end of the spring (403) is fixedly connected to the magnetic sheet (402), and the other end of the spring (403) is fixedly connected to the assembly frame (301). By utilizing the principle of thermal expansion and contraction of gas, the temperature difference between the upper and lower ends of the battery module is converted into the height change of the elastic support (4) through the differential displacement of the mechanism driven by heat. This can directly and sensitively reflect the vertical temperature imbalance between battery modules.

2. The comprehensive detection device for electric vehicle battery temperature according to claim 1, characterized in that: The outer temperature detection mechanism (2) is electrically connected to the detection control module (1), and the outer temperature detection mechanism (2) corresponds to the battery module one by one. The outer temperature detection mechanism (2) is attached to the battery module.

3. The comprehensive detection device for electric vehicle battery temperature according to claim 1, characterized in that: The gap temperature detection mechanism (5) includes a temperature sensing plate (501) and a temperature sensing wire (502). One end of the temperature sensing wire (502) is electrically connected to the temperature sensing plate (501), and the other end of the temperature sensing wire (502) is electrically connected to the detection control module (1). The temperature sensing plate (501) is fixedly nested on the front of the assembly plate (401).

4. The comprehensive detection device for electric vehicle battery temperature according to claim 3, characterized in that: The auxiliary magnetic control mechanism (6) includes an electric push rod (601) and a magnetic block (602). The free end of the electric push rod (601) is fixedly connected to the magnetic block (602). When the magnetic block (602) approaches the magnetic sheet (402), it repels and pushes the magnetic sheet (402) to move.

5. The comprehensive detection device for electric vehicle battery temperature according to claim 4, characterized in that: The detection control module (1) is provided with a ventilation component (10) on the outside, and the elastic support (4) is provided with a purge air passage (7) inside. The ventilation component (10) is used to input airflow into the purge air passage (7).

6. The comprehensive detection device for electric vehicle battery temperature according to claim 5, characterized in that: The ventilation assembly (10) includes a duct (101), a fan (102), an air duct (103), and a distribution frame (104). The duct (101) and the distribution frame (104) are both fixed on the detection control module (1). The air duct (103) is connected between the duct (101) and the distribution frame (104). The fan (102) is located in the duct (101).

7. The comprehensive detection device for electric vehicle battery temperature according to claim 6, characterized in that: The purge air passage (7) includes an internal cavity (701) and a purge port (702). The internal cavity (701) is located inside the assembly plate (401). The purge port (702) is located on the front and back surfaces of the assembly plate (401) and is connected to the internal cavity (701). One end of the assembly plate (401) is fixedly connected to a vent pipe (8). One end of the vent pipe (8) is connected to the internal cavity (701), and the other end of the vent pipe (8) is connected to the distribution frame (104).

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