Two-dimensional sensing grid suitable for monitoring bottom damage of battery pack of electric vehicle and electric vehicle

Abstract

The invention provides a two-dimensional sensing grid suitable for monitoring damage to the bottom of a battery pack of an electric vehicle and the electric vehicle. The two-dimensional sensing grid comprises a first wire group, a second wire group and a third wire group, wherein the first wire group is attached to the bottom of a lower box body of the battery pack in an insulating manner in a first direction in a spraying manner; the second lead group is attached to the bottom of the lower box body of the battery pack in an insulating manner according to a second direction in a spraying manner; the first wire group and the second wire group are insulated and intersected in a plane where the bottom of the lower box body of the battery pack is located to form a wire grid; the wiring ends on the two sides of the first wire group and the second wire group are used for being electrically connected with an electric signal detection module, so that the monitoring unit can be suitable for battery packs with different actual structure surfaces, the material and construction cost of the monitoring unit is reduced, and the monitoring sensitivity and reliability are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery pack damage detection, and in particular to a two-dimensional sensor grid suitable for monitoring damage at the bottom of a battery pack of an electric vehicle and an electric vehicle. Background Art

[0002] In electric vehicle spontaneous combustion and fire accidents, an important cause is the bottom collision (bottoming out) accident of the power battery, that is, the bottom damage caused by the car chassis rubbing against protrusions or other obstacles on the ground while driving. Bottoming out may occur through speed bumps, hitting curbs, going uphill, driving on bumpy roads, and running over stones or bricks on the road surface. In severe cases, it may even cause deformation and cracking of the power battery casing or cooling flow channel.

[0003] For pure electric vehicles, the deformation of the bottom of the battery pack caused by the bottom support will cause some of the cells in this area to be squeezed by stress, and even damage the internal diaphragm and other structures, resulting in a short circuit between the positive and negative electrodes inside the battery cell and an increased risk of thermal runaway. In addition, there is generally a coolant line at the bottom of the battery pack. The bottom support may cause the line to deform or block, thereby affecting the normal flow of the coolant. The heat generated during the operation of the battery pack cannot be taken away in time, and the heat dissipation between different cells is uneven, affecting the life and safety of the battery cells. If the battery pack box is cracked, it will also cause the IP protection level of the battery pack to decrease, and liquid or water vapor will enter the battery pack, affecting the insulation of the high-voltage system and creating safety hazards.

[0004] At present, most electric vehicle manufacturers have their own after-sales battery pack bottom scraping inspection standards. Different critical deformation amounts are set for battery packs of different material systems (such as LFP, NCM, etc.) and different parts of the battery pack (such as the bottom, sidewalls, flow channel area, etc.). The after-sales maintenance link of each brand's 4S store requires that the bottom of the battery pack must be scraped and inspected for vehicles entering the store, whether for repair or maintenance. If scratches, deformations, cracks, etc. are found on the bottom of the battery pack, and the values ​​exceed the specified values, it will be mandatory to open the battery pack for inspection, and even return to the factory for repairs, replace the new battery pack, etc., and the cost is often as high as tens of thousands of yuan. In addition, due to interference such as vibration and bumps during driving, the damage caused by the bottoming is often not easy to detect, and it is difficult to identify the scene of the accident in subsequent accident identification, resulting in difficulties in insurance claims.

[0005] At present, there is no mature on-board power battery pack bottoming monitoring and early warning solution that has been truly promoted and applied. Among the published patents, patent CN112406895A discloses a monitoring method, monitoring device and server for vehicle chassis bottoming events, but it cannot determine the location of the battery pack bottoming; patent CN108802623A discloses a system and method for detecting the loss of the battery pack shell of an electric vehicle, but it cannot determine the severity of the battery pack bottoming. The above two patents both obtain battery pack bottoming information in an indirect manner, cannot accurately identify bottoming events, and cannot detect multiple bottoming positions at the same time. The published patent CN112652829A mentions the use of resistance wire cloth laying to monitor bottom damage through changes in resistance and current. This method requires additional resistance wire cloth devices, which will increase the overall material cost and volume thickness. At the same time, during the specific installation, there will be problems with the insulation and adhesion of the resistance wire cloth and the lower box of the battery pack (usually made of aluminum). In addition, for battery packs with complex flow channel designs at the bottom, the resistance wire cloth cannot perfectly fit the uneven surface, which will cause missed detection in key areas. For battery packs with bottom protective coating (PVC), the application of resistance wire cloth will also affect the normal spraying process of the bottom protective coating and the final coating adhesion.

[0006] Therefore, there is a need for a technical solution suitable for monitoring damage on the bottom of an electric vehicle battery pack. This technical solution can be applicable to battery packs with different structural surfaces, reduce the material and construction costs of the monitoring unit, and improve the sensitivity and reliability of monitoring. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides a two-dimensional sensor grid suitable for monitoring damage on the bottom of an electric vehicle battery pack, comprising:

[0008] A first wire group is insulated and attached to the bottom of the lower box of the battery pack in a first direction by spraying;

[0009] A second conductive wire group is insulated and attached to the bottom of the lower box of the battery pack in a second direction by spraying;

[0010] Wherein, the first wire group and the second wire group are insulated and intersected in a plane where the bottom of the lower box of the battery pack is located to form a wire grid;

[0011] The connection terminals at both sides of the first wire group and the second wire group are used to electrically connect to the electrical signal detection module.

[0012] In a possible implementation, the first wire group and the second wire group extend from a bottom surface of the lower box of the battery pack to a side surface thereof.

[0013] In a possible implementation, the first direction and the second direction are two orthogonal directions in a plane where the bottom of the lower box of the battery pack is located.

[0014] In a possible implementation, the first direction is a vertical connection direction between a first pair of side surfaces of the lower box of the battery pack;

[0015] The second direction is the vertical connection direction between the second pair of side surfaces of the lower box of the battery pack.

[0016] In a possible implementation, an insulating layer is provided at the contact positions between the first wire group, the second wire group, and the lower box of the battery pack, and the width of the insulating layer is at least not less than the width of the first conductive wire used to construct the first wire group and the second conductive wire used to construct the second wire group.

[0017] In a possible implementation, the insulating layer has a width of 2-3 mm and a thickness of 20-100 μm.

[0018] In a possible implementation manner, the first conductive line and the second conductive line have a width of 1-2 mm and a thickness of 20-100 μm.

[0019] In a possible implementation, the insulating layer has a width of 3 mm and a thickness of 50 μm;

[0020] The first conductive line and the second conductive line have a width of 2 mm and a thickness of 50 μm.

[0021] In a possible implementation, the density of the wire grid at a position of the lower case of the battery pack where the coolant flow channel is provided is greater than the density of the wire grid at other positions of the lower case of the battery pack.

[0022] The present invention also provides an electric vehicle provided with the two-dimensional sensor grid and the electric signal detection module as described above.

[0023] The technical solution provided by the present invention has at least the following beneficial effects:

[0024] By providing a first wire group that is insulated and attached to the bottom of the lower box of the battery pack in a first direction by spraying, and a second wire group that is insulated and attached to the bottom of the lower box of the battery pack in a second direction by spraying, it can be generally applicable to different types of battery pack bottom structures, does not require additional assembly processes, has strong adhesion, is sensitive to defects such as scratches, deformation and cracks on the bottom of the battery pack, responds quickly and obviously, has high monitoring reliability, and effectively reduces the material cost when real-time monitoring of damage to the bottom of the battery pack of an electric vehicle is carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An overall schematic diagram of a two-dimensional sensor grid suitable for monitoring damage at the bottom of an electric vehicle battery pack provided by an embodiment of the present invention;

[0026] Figure 2 A cross-sectional view of a two-dimensional sensor grid suitable for monitoring damage at the bottom of an electric vehicle battery pack provided by an embodiment of the present invention;

[0027] In the accompanying drawings, 10, battery pack lower box; 11, first wire group; 12, second wire group; 13, insulating layer; 20, coolant flow channel; 111, first conductive wire; 121, second conductive wire; 131, first insulating layer; 132, second insulating layer. DETAILED DESCRIPTION

[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0029] Please refer to Figure 1 and Figure 2 The present invention provides a two-dimensional sensor grid suitable for monitoring damage at the bottom of an electric vehicle battery pack, comprising:

[0030] A first wire group 11 is insulated and attached to the bottom of the lower box 10 of the battery pack in a first direction by spraying;

[0031] A second wire group 12 is insulated and attached to the bottom of the lower box 10 of the battery pack in a second direction by spraying;

[0032] The first wire group 11 and the second wire group 12 are insulated and intersected in the plane where the bottom of the battery pack lower box 10 is located to form a wire grid;

[0033] The connection terminals at both sides of the first wire group 11 and the second wire group 12 are used to electrically connect to an electrical signal detection module.

[0034] It should be noted that, since the battery pack is located at the bottom of the electric vehicle, it is very easy to be contaminated with water, mud, etc. during daily driving, which seriously affects the real-time monitoring and shooting of traditional cameras. At the same time, since the bottom of the battery pack has a large paving area, the bottom structure has a concave-convex flow channel design, and the allowable critical deformation is small (within a few millimeters), it is difficult for a single strain sensor to achieve coverage monitoring of the entire battery pack. According to the specific application scenario, the present invention designs and develops a two-dimensional sensor grid that can be integrated and used at the bottom of the battery pack. When the electric vehicle encounters a bottoming condition, and the lower box 10 of the battery pack is scratched, deformed, or cracked, the two-dimensional sensor grid will convert the corresponding impact load into a corresponding electrical signal, and analyze and process it through the electrical signal detection module to accurately locate and record the relevant data such as the damage time, damage location, and damage degree. The relevant data can be uploaded to the driving computer or the corresponding domain controller, and a safety warning can be issued to the driver in the form of an instrument fault light. In an emergency, emergency measures can even be adopted, such as limiting the maximum output power, remotely contacting emergency rescue, etc. to ensure the safety of the vehicle and the driver. The electrical signal detection module can be powered by a battery pack or a separate power supply can be set, including a voltage detection unit and a current detection unit, which can be implemented based on a single-chip microcomputer. The corresponding resistance can be calculated by collecting voltage and current. The changes in voltage, resistance, current, etc. can be used to determine which conductive wires are broken or damaged, so as to accurately locate and record the damage time, damage location and degree. The part of uploading relevant data to the driving computer or the corresponding domain controller and subsequent operations are not within the scope of protection requested by this application, but are only used to improve specific application scenarios so that those skilled in the art can better understand the technical solution requested by this application.

[0035] In the specific implementation, considering the harsh working conditions of vehicle-mounted use, the two-dimensional sensor grid should have strong adhesion (resistance to vibration and bumps), weather resistance (resistance to high and low temperature cycles, resistance to rain, snow and salt spray erosion), long life and other automotive-grade requirements, while meeting the stringent requirements of monitoring accuracy and a series of product application and promotion such as simple production process, low cost, and insulation from the aluminum shell of the battery pack. The spraying method in the present invention adopts an integrated spraying process to integrate the two-dimensional sensor grid with the lower box 10 of the battery pack, which can accurately realize real-time monitoring of damage to different areas of the bottom of the battery pack. At the same time, the integrated spraying process can reduce the number of process steps and parts, does not affect the external dimensions of the battery pack, and can make full use of the protective effect of the bottom protective coating to extend the life of the two-dimensional sensor grid. In addition, the spraying process can make the two-dimensional sensor grid well match the special shape of the bottom of the battery pack, such as cooling channels, so as to effectively monitor key areas.

[0036] In this embodiment, the first wire group 11 and the second wire group 12 can be made of the same material, and the first wire group 11 and the second wire group 12 are not conductive to each other. The first wire group 11 is insulated and attached to the bottom of the lower box 10 of the battery pack, which can be understood as an insulated connection between the two. For example, if the lower box 10 of the battery pack itself is insulated, the first wire group 11 can be directly attached to the bottom of the lower box 10 of the battery pack by spraying; if the lower box 10 of the battery pack itself is conductive, an insulating layer needs to be provided between the first wire group 11 and the bottom of the lower box 10 of the battery pack. The second wire group 12 is insulated and attached to the bottom of the lower box 10 of the battery pack, which can be understood as an insulated connection between the two, and the specific situation is similar to that of the first wire group 11.

[0037] The spraying materials of the first wire group 11 and the second wire group 12 can be made of conductive ions (such as Cu 2+ / Ag + A polymer solution (such as spray paint or colloid) containing conductive particles (such as graphite / graphene, etc.) is sprayed and dried (or dried naturally) to form a plurality of tightly attached conductive wires (i.e., the first wire group 11 and the second wire group 12) with a width of several millimeters and a thickness of tens of microns on the lower box 10 of the battery pack. In a specific implementation, the spraying material of the first wire group 11 and the second wire group 12 can be a material containing Cu 2+ Conductive paint with composite particles, volume resistance <6*10 after drying -4 Ω·cm, adhesion>=4B (100-grid 3M600 tape), use after drying at 60℃ for half an hour. In the laboratory, the conductive wire is sprayed on the PVC sheet with a width of about 2mm, a thickness of about 50um, and a length of 1m. After drying, the measured resistance is <100Ω.

[0038] like Figure 1 As shown, a two-dimensional sensing grid is formed on the lower box 10 of the battery pack through an integrated spraying and drying process. According to the monitoring accuracy requirements, a two-dimensional grid-type monitoring layer, i.e., a two-dimensional sensing grid (composed of a first wire group 11 in the X-axis direction and a second wire group 12 in the Y-axis direction orthogonally) can be realized by multiple spraying in different directions (such as orthogonal X / Y-axis directions). The conductive two-dimensional sensing grid (conductive wire bundle in the X-axis direction and conductive wire bundle in the Y-axis direction) is monitored by applying low voltage (12V or 5V) through an electrical signal detection module. When the battery pack is scratched, deformed, or cracked by external damage, the conductive grid attached to the corresponding part of the two-dimensional sensing grid will fall off, stretch, break, etc., and the collected electrical signals (such as resistance, voltage, etc.) will change. After analysis and processing, the accurate damage location and degree of damage can be obtained.

[0039] In a possible implementation, the first wire group 11 and the second wire group 12 extend from the bottom surface of the battery pack lower box 10 to the side surface thereof.

[0040] In this embodiment, the spraying area (nozzle) of the first wire group 11 and the second wire group 12 covers the bottom side of the battery pack, thereby increasing the risk monitoring range. In a preferred embodiment, the spraying area (nozzle) of the first wire group 11 and the second wire group 12 also covers the concave and convex surface of the coolant flow channel 20 at the bottom of the battery pack, thereby further increasing the risk monitoring range.

[0041] In a possible implementation, the first direction and the second direction are two orthogonal directions in a plane where the bottom of the battery pack lower box 10 is located.

[0042] In this embodiment, the first direction can be regarded as the X-axis direction in the XY plane, and the second direction can be regarded as the Y-axis direction in the XY plane. The two-dimensional sensing grid is an orthogonal grid in the X-axis direction and the Y-axis direction. The first wire group 11 can be sprayed in the X-axis direction by composite spraying of insulating paint and conductive paint, and then the second wire group 12 can be sprayed in the Y-axis direction; or the second wire group 12 can be sprayed in the Y-axis direction by composite spraying of insulating paint and conductive paint, and then the first wire group 11 can be sprayed in the X-axis direction.

[0043] In a possible implementation, the first direction is a vertical connection direction between a first pair of side surfaces of the battery pack lower box 10;

[0044] The second direction is the vertical connection direction between the second pair of side surfaces of the lower box body 10 of the battery pack.

[0045] In this embodiment, the length direction of the battery pack lower box 10 can be regarded as the first direction, and the width direction can be regarded as the second direction.

[0046] In a possible implementation, an insulating layer 13 is provided at the contact positions between the first wire group 11, the second wire group 12, and the battery pack lower box 10, and the width of the insulating layer 13 is at least not less than the width of the first conductive wire 111 used to construct the first wire group 11 and the second conductive wire 121 used to construct the second wire group 12.

[0047] In this embodiment, considering that most battery pack lower boxes 10 are made of welded aluminum profiles, the conductivity of the aluminum box will interfere with the collection and analysis of signals on the two-dimensional sensor grid. In practical applications, before spraying the conductive wire, a layer of insulating paint wire that is the same width or slightly wider than the conductive wire and tens of microns thick can be sprayed as part of the insulating layer 13, which can not only achieve insulation isolation, but also protect the first conductive wire 111 and the second conductive wire 121. The first wire group 11 is constructed of a plurality of first conductive wires 111, and the second wire group 12 is constructed of a plurality of second conductive wires 121. The insulating layer 13 can use a common acrylic system circuit board insulating paint with a volume resistance>1.0*10 14 Ω·cm, dry at 30℃ for half an hour before use. After spraying, a transparent and tough protective film can be formed with good electrical insulation properties. For better protection, a three-layer composite form of insulating paint, conductive paint and insulating paint can also be used, that is, insulating paint is provided on the upper and lower surfaces of the first conductive wire 111 and the second conductive wire 121. In the specific implementation, the thickness of the two-dimensional sensing grid is only tens to hundreds of microns, which has no effect on the bottom size of the battery pack and has no effect on the ground clearance of the vehicle.

[0048] It should be noted that the material cost of the two-dimensional sensor grid in the present invention is relatively low. For example, assuming that the bottom area of ​​the battery pack lower box 10 is 2200mm*1500mm, if the density of the wire grid in the vertical and horizontal directions is 1 minimum grid per 2cm, the wire width of the first conductive wire 111 and the second conductive wire 121 are both 1mm, the insulation layer 13 is 2mm wide and 50um thick, then the total length of the sprayed conductive wire is about 333.7m, and the total volume of the conductive paint is only about 16.685cm 3 The total volume of insulating paint is only 33.37cm 3 It can be seen that the material required to spray the entire two-dimensional sensor grid on the bottom surface of the battery pack lower box 10 is not much, and the material cost is low.

[0049] In a possible implementation, the insulating layer 13 has a width of 2-3 mm and a thickness of 20-100 μm.

[0050] In this embodiment, in order to play an insulating and protective role, the insulating layer 13 should have high resistance, strong adhesion, good temperature resistance, moisture resistance and corrosion resistance. A preferred solution is: the volume resistance of the insulating layer 13> 10 14 Ω·cm, the insulation wire thickness of the insulation layer 13 is 20-100um (the thickness can be increased by repeated spraying), and the protection level is IP65 and above.

[0051] In a possible implementation, the first conductive line 111 and the second conductive line 121 have a width of 1-2 mm and a thickness of 20-100 μm.

[0052] In this embodiment, in order to maintain the accuracy and sensitivity of monitoring under low pressure conditions, the two-dimensional conductive grid has the characteristics of high conductivity, low resistance, strong adhesion, etc. A preferred solution is that the first conductive wire 111 and the second conductive wire 121 are the same conductive wire, and the volume resistance is less than 10 -4 Ω·cm, the thickness of the conductive wire is 20-100μm (the thickness can be increased by repeated spraying), and the adhesion strength is >2H.

[0053] In a possible implementation, the insulating layer 13 has a width of 3 mm and a thickness of 50 μm;

[0054] The first conductive line 111 and the second conductive line 121 have a width of 2 mm and a thickness of 50 μm.

[0055] In a possible implementation, the density of the wire grid at the position where the coolant channel 20 is provided in the lower case 10 of the battery pack is greater than the density of the wire grid at other positions of the lower case 10 of the battery pack.

[0056] In this embodiment, for key areas, such as the cooling channel area (i.e., the area where each coolant channel 20 is located), the tolerance for damage (such as dents and deformation, etc.) is lower, that is, the critical value is smaller, and the density of the wire grid can be increased (for example, by using a few nozzles for repeated spraying or increasing the nozzle density, etc.) to improve the monitoring accuracy.

[0057] The present invention also provides an electric vehicle provided with the two-dimensional sensor grid and the electric signal detection module as described above.

[0058] In this embodiment, the insulating layer 13 of the two-dimensional conductive grid sensing layer, i.e., the two-dimensional sensing grid, is divided into a first insulating layer 131 in the X-axis direction and a second insulating layer 132 in the Y-axis direction. The preparation process of the two-dimensional sensing grid is as follows:

[0059] Step S100: first, clean and dry the lower box 10 of the battery pack in the electric vehicle, including removing dust, oil stains, water vapor (water film), etc.;

[0060] Step S200: Complete the spraying of the first insulating layer 131 and the first conductive wire layer (composed of several first conductive wires 111) in the X-axis direction (such as the length direction of the battery pack). First, the insulating paint is sprayed through a multi-nozzle tooling, and the parameters such as the diameter of the nozzle spray liquid flow, the distance between the nozzle and the lower box 10 of the battery pack, and the nozzle routing speed are controlled to finally form an insulating paint layer with a width of about 3mm and a thickness of about 50um. Dry at room temperature (25°C) for half an hour, or dry with hot air (50°C) for 5 minutes to dry the first insulating layer 131, and then spray the first conductive wire layer. The first conductive wire layer covers the first insulating layer 131. The first insulating layer 131 is composed of several first insulating wires. Each first conductive wire 111 corresponds to a first insulating wire, and the center lines of the two coincide, but the width is slightly narrower (about 2mm) to avoid short circuit with the aluminum profile box. After spraying, dry at 60℃-80℃ for half an hour (when the temperature is lower, such as room temperature, the drying time is correspondingly extended to 24 hours) to completely dry the first conductive wire layer;

[0061] Step S300: Using the same method as step S200, spray the second insulating layer 132 and the second conductive wire layer (composed of a plurality of second conductive wires 121) in the Y-axis direction (such as the width direction of the battery pack). The final cross-sectional structure of the two-dimensional sensor grid is as follows: Figure 2 As shown;

[0062] Step S400: Two-dimensional sensing grid detection: For the wire grid sprayed in the X / Y axis direction, the conductivity and resistance of each conductive wire, as well as the insulation between the conductive wires in the X / Y axis direction can be detected to determine whether the spraying quality meets the standard. Generally speaking, the conductivity of each conductive wire is good, the resistance is tens to hundreds of ohms, and the resistance of each conductive wire in the X-axis direction and the Y-axis direction is relatively stable. The insulation performance of the wires between the X-axis direction and the Y-axis direction is good, and the insulation resistance should be no less than megohms;

[0063] Step S500: After the two-dimensional sensing grid is prepared, each wire terminal is protected to facilitate subsequent wiring, and then a bottom protective coating (PVC) is sprayed or a protective felt is laid.

[0064] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A two-dimensional sensor grid suitable for monitoring damage at the bottom of an electric vehicle battery pack, characterized in that: include: A first wire group is insulated and attached to the bottom of the lower box of the battery pack in a first direction by spraying; A second wire group is insulated and attached to the bottom of the lower box of the battery pack in a second direction by spraying; Wherein, the first wire group and the second wire group are insulated and intersected in a plane where the bottom of the lower box of the battery pack is located to form a wire grid; The connection terminals at both sides of the first wire group and the second wire group are used to electrically connect to the electrical signal detection module.

2. The two-dimensional sensor grid according to claim 1, characterized in that: The first wire group and the second wire group extend from the bottom surface of the battery pack lower box to the side surface thereof.

3. The two-dimensional sensor grid according to claim 1, characterized in that: The first direction and the second direction are two directions orthogonal to each other in a plane where the bottom of the lower box of the battery pack is located.

4. The two-dimensional sensor grid according to claim 3, characterized in that: The first direction is the vertical connection direction between the first pair of side surfaces of the lower box of the battery pack; The second direction is the vertical connection direction between the second pair of side surfaces of the lower box of the battery pack.

5. The two-dimensional sensor grid according to claim 1, characterized in that: An insulating layer is provided at the contact positions between the first wire group, the second wire group, and the lower box of the battery pack, and the width of the insulating layer is at least not less than the width of the first conductive wire used to construct the first wire group and the second conductive wire used to construct the second wire group.

6. The two-dimensional sensor grid according to claim 5, characterized in that: The insulating layer has a width of 2-3 mm and a thickness of 20-100 μm.

7. The two-dimensional sensor grid according to claim 6, characterized in that: The first conductive line and the second conductive line have a width of 1-2 mm and a thickness of 20-100 μm.

8. The two-dimensional sensor grid according to claim 7, characterized in that: The insulating layer has a width of 3 mm and a thickness of 50 μm; The first conductive line and the second conductive line have a width of 2 mm and a thickness of 50 μm.

9. The two-dimensional sensor grid according to claim 1, characterized in that: The density of the wire grid at a position of the lower case of the battery pack where the coolant flow channel is provided is greater than the density of the wire grid at other positions of the lower case of the battery pack.

10. An electric vehicle, characterized in that: A two-dimensional sensing grid and an electrical signal detection module as described in any one of claims 1 to 9 are provided.

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