Detection tool and battery pack temperature sensing detection system

Abstract

The utility model relates to power battery technical field, more particularly, relate to a kind of detection tool and battery pack temperature sensing detection system.The detection tool includes heating piece and fixing part, heating piece is used to heat water pipe;Fixing part is provided with first recess and second recess, and heating piece is housed in first recess;First recess is used to fix liquid outlet pipe, and second recess is used to fix liquid inlet pipe.The detection tool can detect whether the installation of temperature sensor is correct, thereby improving the qualified rate of product.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and more specifically, to a testing fixture and a battery pack temperature sensing detection system. Background Technology

[0002] With the booming development of the new energy vehicle industry, lithium battery packs using liquid cooling solutions have become a core component of electric vehicle power battery systems due to their superior thermal management performance. Current technical standards primarily utilize integrated cooling pipes within the battery pack and a circulating cooling medium to ensure the cells remain within their optimal operating temperature range.

[0003] In the manufacturing process of liquid-cooled lithium battery packs, temperature sensors need to be installed at the inlet and outlet of the cooling pipes to monitor the temperature of the cooling medium in real time, thereby ensuring the stable operation of the battery pack thermal management system.

[0004] However, during the installation process, temperature sensors are prone to errors, and existing technologies cannot effectively identify these defects, resulting in a low product qualification rate. Utility Model Content

[0005] The purpose of this invention is to provide a testing fixture and a battery pack temperature sensing system that can detect whether the temperature sensor is installed correctly, thereby improving the product qualification rate.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides a testing fixture, comprising:

[0008] Heating element, used to heat water pipes;

[0009] The fastener has a first groove and a second groove, and the heating element is housed in the first groove; the first groove is used to fix the liquid outlet pipe, and the second groove is used to fix the liquid inlet pipe.

[0010] In an optional embodiment, the fastener includes a support plate, a first buckle, and a second buckle, which engage with the support plate; the first buckle is directly opposite the first groove, and the second buckle is directly opposite the second groove.

[0011] In an optional implementation, the support plate includes thermal insulation foam.

[0012] In an optional embodiment, the testing fixture further includes a first fixing foam and a second fixing foam; the first fixing foam is disposed in the first groove and is used to fix the first temperature sensor; the second fixing foam is disposed in the second groove and is used to fix the second temperature sensor.

[0013] In an optional embodiment, the testing fixture further includes a first sealing strip and a second sealing strip, wherein the first sealing strip is connected to the opening of the first groove and the second sealing strip is connected to the opening of the second groove.

[0014] In an optional embodiment, the heating element includes a flexible heating film attached to the inner wall of the first groove.

[0015] Secondly, this utility model provides a battery pack temperature sensing detection system, including a first temperature sensor, a second temperature sensor, an outlet pipe, an inlet pipe, and the aforementioned detection fixture.

[0016] The first temperature sensor is installed in the outlet pipe, and the second temperature sensor is installed in the inlet pipe; the first temperature sensor and the outlet pipe are housed in the first groove, and the second temperature sensor and the inlet pipe are housed in the second groove.

[0017] In an optional embodiment, the extension direction of the first groove is parallel to the extension direction of the outlet pipe, and the extension direction of the second groove is parallel to the extension direction of the inlet pipe.

[0018] In an optional implementation, the battery pack temperature sensing system further includes a detector electrically connected to a first temperature sensor and a second temperature sensor.

[0019] In an optional embodiment, the battery pack temperature sensing system further includes a support member and a battery housing, the support member being connected to a first temperature sensor, a second temperature sensor, and the battery housing; both the liquid outlet pipe and the liquid inlet pipe are connected to the battery housing.

[0020] The beneficial effects of the detection fixture and battery pack temperature sensing system provided in this embodiment of the invention include:

[0021] This testing fixture uses a fixing device to secure the inlet and outlet pipes, and a heating element to heat the outlet pipe, creating a temperature difference between the inlet and outlet pipes to simulate the temperature difference experienced by coolant flowing through them. Temperature sensors located on the inlet and outlet pipes then measure the pipe temperature. Based on whether the measured temperature falls within the sensor's sensing range, the fixture determines whether the first and second temperature sensors are correctly positioned. This facilitates the detection of defective battery packs, allowing for reinstallation and ultimately improving the product yield. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the testing fixture provided in this embodiment;

[0024] Figure 2 This is a schematic diagram of the battery pack temperature sensing system provided in this embodiment;

[0025] Figure 3 This is a structural schematic diagram of the fastener provided in this embodiment;

[0026] Figure 4 This is a partial schematic diagram from a first-view perspective of the battery pack temperature sensing detection system provided in this embodiment;

[0027] Figure 5 This is a partial schematic diagram of the battery pack temperature sensing detection system provided in this embodiment from a second perspective.

[0028] Icons: 100-Detection fixture; 110-Heating element; 120-Fixing element; 101-First groove; 102-Second groove; 121-Support plate; 122-First buckle; 123-Second buckle; 130-First fixing foam; 140-Second fixing foam; 200-Battery pack temperature sensing detection system; 210-First temperature sensor; 220-Second temperature sensor; 230-Liquid outlet pipe; 240-Liquid inlet pipe; 250-Support element; 260-Battery casing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model 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 utility model.

[0033] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0034] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0035] In industrial production, lithium battery packs must undergo rigorous off-line testing to ensure compliance with quality standards. However, conventional testing procedures have technical limitations: because the liquid cooling piping system is not actually filled with cooling medium during testing, temperature sensors cannot be verified for functionality through standard testing procedures. Under these conditions, if the temperature sensors at the inlet and outlet of the liquid cooling piping are misaligned or have structural defects, traditional testing methods are insufficient to effectively identify such defective products.

[0036] For the above issues, please refer to... Figures 1-5 This utility model provides a battery pack temperature sensing detection system 200. The battery pack temperature sensing detection system 200 includes a battery pack and a detection fixture 100. The battery pack includes a first temperature sensor 210, a second temperature sensor 220, and a liquid cooling pipeline. The first temperature sensor 210 is installed in the outlet pipe 230 of the liquid cooling pipeline and is used to measure the temperature of the liquid in the outlet pipe 230. The second temperature sensor 220 is installed in the inlet pipe 240 of the liquid cooling pipeline and is used to measure the temperature of the liquid in the inlet pipe 240.

[0037] Specifically, the detection fixture 100 in this embodiment includes a heating element 110 and a fixing element 120. The fixing element 120 is provided with a first groove 101 and a second groove 102. The heating element 110, the first temperature sensor 210 and the liquid outlet pipe 230 are housed in the first groove 101 to fix the liquid outlet pipe 230; while the second temperature sensor 220 and the liquid inlet pipe 240 are housed in the second groove 102 to fix the liquid inlet pipe 240.

[0038] Since the heating element 110 is also located within the first groove 101, the heating element 110 can heat the outlet pipe 230. Understandably, the coolant enters from the inlet pipe 240 and then absorbs heat from the battery cell, causing the coolant temperature to increase. Therefore, the temperature of the liquid in the outlet pipe 230 is higher than the temperature of the liquid in the inlet pipe 240.

[0039] In this embodiment, the cross-section of the first groove 101 is semi-circular, that is, the inner wall of the first groove 101 is arc-shaped. In order to ensure heating efficiency, the heating element 110 in this embodiment adopts a flexible heating film so that the heating element 110 can be attached to the inner wall of the first groove 101.

[0040] It should be noted that since the temperature of the liquid in the outlet pipe 230 is greater than the temperature of the liquid in the inlet pipe 240, the temperature sensing range of the first temperature sensor 210 is greater than that of the second temperature sensor 220, i.e., the temperature range that the temperature sensors can measure. Under test conditions, the liquid cooling pipeline is not filled with coolant. The testing fixture 100 provided in this embodiment uses the heating element 110 to heat the outlet pipe 230 to simulate the temperature environment of the outlet pipe 230 and the inlet pipe 240 during the flow of coolant in the cooling pipeline. Specifically, it can be understood that the preset temperature of the outlet pipe 230 is not within the temperature sensing range of the second temperature sensor 220. Therefore, the heating element 110 can heat the unfilled outlet pipe 230 to the preset temperature. If there is an installation misalignment, the temperature measured by the second temperature sensor 220 will not be within its own temperature sensing range; if the installation is correct, both the first temperature sensor 210 and the second temperature sensor 220 will be within their own temperature sensing ranges.

[0041] The working principle of the detection fixture 100 provided in this embodiment is as follows:

[0042] The outlet pipe 230 is placed in the first groove 101, and the inlet pipe 240 is placed in the second groove 102. Then, the outlet pipe 230 is heated by the heating element 110 located in the first groove 101, so that the temperature of the outlet pipe 230 reaches the preset temperature, and there is a temperature difference between the outlet pipe 230 and the inlet pipe 240.

[0043] If the temperatures measured by the temperature sensors on the inlet pipe 240 and the outlet pipe 230 are within their respective temperature sensing ranges, it indicates that the first temperature sensor 210 is installed on the outlet pipe 230 and the second temperature sensor 220 is installed on the inlet pipe 240, indicating correct installation. If the temperatures measured by the temperature sensors on the inlet pipe 240 and the outlet pipe 230 are not within their respective temperature sensing ranges, it indicates that the second temperature sensor 220 is installed on the outlet pipe 230 and the first temperature sensor 210 is installed on the inlet pipe 240, indicating misalignment, and reinstallation is required.

[0044] Therefore, this embodiment can heat the outlet pipe 230 through the heating element 110, creating a temperature difference between the outlet pipe 230 and the inlet pipe 240. Subsequently, temperature sensors on the outlet pipe 230 and the inlet pipe 240 measure their temperatures. Based on whether the temperatures measured by the temperature sensors on the outlet pipe 230 and the inlet pipe 240 are within their respective temperature ranges, it is determined whether the first temperature sensor 210 and the second temperature sensor 220 are installed correctly. This avoids problems such as misaligned installation or structural defects of the temperature sensors at the inlet and outlet of the liquid cooling pipeline, improving the product qualification rate.

[0045] Based on the above, this embodiment also includes an electrical connection to the first temperature sensor 210 and the second temperature sensor 220, thereby determining whether the temperature signals transmitted by the first temperature sensor 210 and the second temperature sensor 220 are within their own temperature sensing range using a detector. Specifically, the detector can be a BMS (Battery Management System), which collects the temperature values ​​of each temperature sensor to determine whether the collected temperature values ​​are within the temperature sensing range of that temperature sensor.

[0046] Understandably, if installed correctly, the BMS can successfully acquire the temperature value measured by the temperature sensor. If installed incorrectly, the BMS will be unable to acquire the correct temperature value, resulting in acquisition errors.

[0047] Further, please refer to Figures 1-3 In this embodiment, the fixing member 120 includes a support plate 121, a first buckle 122, and a second buckle 123. Specifically, the first buckle 122 is directly opposite the first groove 101, thereby fixing the liquid outlet pipe 230 located in the first groove 101 through the snap-fit ​​engagement between the first buckle 122 and the support plate 121, preventing the liquid outlet pipe 230 from detaching from the first groove 101 and improving the accuracy of detection. Similarly, the second buckle 123 is directly opposite the second groove 102, thereby fixing the liquid inlet pipe 240 located in the second groove 102 through the snap-fit ​​engagement between the second buckle 123 and the support plate 121.

[0048] In other embodiments, the outlet pipe 230 and the inlet pipe 240 can also be fixed using bolts or screws, depending on the actual situation.

[0049] According to the above, the detection fixture 100 of this embodiment also includes a first fixing foam 130 and a second fixing foam 140. The first fixing foam 130 is disposed in the first groove 101, and the second fixing foam 140 is disposed in the second groove 102, so as to fix the first temperature sensor 210 and the second temperature sensor 220 respectively, thereby ensuring that the temperature sensors can more accurately measure the temperature of the liquid pipe 230 and the liquid inlet pipe 240, and improve the accuracy of detection.

[0050] It should be noted that in this embodiment, the support plate 121, the first fixing foam 130 and the second fixing foam 140 are all made of heat-resistant foam material, so that the foam used in the support plate 121 has heat insulation properties, avoiding the heat of the liquid outlet pipe 230 from being transferred to the liquid inlet pipe 240, which would reduce the temperature difference between the liquid outlet pipe 230 and the liquid inlet pipe 240 and affect the detection results.

[0051] In this embodiment, to prevent impurities from entering the first groove 101 or the second groove 102 during the detection process and affecting the temperature measurement of the first temperature sensor 210 and the second temperature sensor 220, the detection fixture 100 also includes a first sealing strip and a second sealing strip. The first sealing strip and the second sealing strip are respectively connected to the groove opening of the first groove 101 and the groove opening of the second groove 102, thereby filling the gap between the groove and the liquid cooling pipeline and preventing external impurities from entering the first groove 101 and the second groove 102.

[0052] Further, please refer to Figures 1-5 The battery pack also includes a battery housing 260, with liquid cooling pipes located inside the battery housing 260. The liquid outlet pipe 230 and the liquid inlet pipe 240 are connected to and pass through the side wall of the battery housing 260, allowing coolant from outside the battery pack to enter through the liquid inlet pipe 240, exchange heat with the battery cells, and then leave the battery pack through the liquid outlet pipe 230.

[0053] Furthermore, this embodiment also includes a support member 250, which is fixedly connected to the battery housing 260, the first temperature sensor 210, and the second temperature sensor 220, thereby improving the stability of the first temperature sensor 210 and the second temperature sensor 220, and further fixing the first temperature sensor 210 and the second temperature sensor 220.

[0054] It should be noted that the liquid outlet pipe 230 and the liquid inlet pipe 240 bend and extend toward the side wall of the battery casing 260 to reduce stress. In order to ensure the accuracy of the detection, the first groove 101 and the second groove 102 in this embodiment are also bent and extended. That is, the extension direction of the first groove 101 is parallel to the extension direction of the liquid outlet pipe 230, and the extension direction of the second groove 102 is parallel to the extension direction of the liquid inlet pipe 240.

[0055] In summary, this embodiment provides a battery pack temperature sensing detection system 200, which includes a detection fixture 100. An inlet pipe 240 and an outlet pipe 230 are fixed by a fixing member 120, and a heating member 110 heats the outlet pipe 230, creating a temperature difference between the outlet pipe 230 and the inlet pipe 240 to simulate the temperature difference when coolant flows within them. Subsequently, temperature sensors located on the outlet pipe 230 and the inlet pipe 240 measure the temperature of the pipes. Based on whether the measured temperature is within the sensing range of the temperature sensor, the system determines whether the installation positions of the first temperature sensor 210 and the second temperature sensor 220 are correct. This facilitates the detection of defective battery packs, allowing for reinstallation and improving the product pass rate.

[0056] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A testing fixture, characterized in that, include: A heating element (110) is used to heat a water pipe; The fixing member (120) is provided with a first groove (101) and a second groove (102), and the heating member (110) is accommodated in the first groove (101); the first groove (101) is used to fix the liquid outlet pipe (230), and the second groove (102) is used to fix the liquid inlet pipe (240).

2. The testing fixture according to claim 1, characterized in that, The fastener (120) includes a support plate (121), a first buckle (122) and a second buckle (123), the first buckle (122) and the second buckle (123) being engaged with the support plate (121); the first buckle (122) is directly opposite the first groove (101), and the second buckle (123) is directly opposite the second groove (102).

3. The testing fixture according to claim 2, characterized in that, The support plate (121) includes thermal insulation foam.

4. The testing fixture according to claim 1, characterized in that, The testing fixture (100) further includes a first fixing foam (130) and a second fixing foam (140); the first fixing foam (130) is disposed in the first groove (101) and is used to fix the first temperature sensor (210); the second fixing foam (140) is disposed in the second groove (102) and is used to fix the second temperature sensor (220).

5. The testing fixture according to claim 1, characterized in that, The testing fixture (100) further includes a first sealing strip and a second sealing strip, wherein the first sealing strip is connected to the opening of the first groove (101) and the second sealing strip is connected to the opening of the second groove (102).

6. The testing fixture according to claim 1, characterized in that, The heating element (110) includes a flexible heating film, which is attached to the inner wall of the first groove (101).

7. A battery pack temperature sensing detection system, characterized in that, It includes a first temperature sensor (210), a second temperature sensor (220), an outlet pipe (230), an inlet pipe (240), and a detection fixture (100) as described in any one of claims 1-6. The first temperature sensor (210) is installed in the outlet pipe (230), and the second temperature sensor (220) is installed in the inlet pipe (240); the first temperature sensor (210) and the outlet pipe (230) are housed in the first groove (101), and the second temperature sensor (220) and the inlet pipe (240) are housed in the second groove (102).

8. The battery pack temperature sensing detection system according to claim 7, characterized in that, The extension direction of the first groove (101) is parallel to the extension direction of the liquid outlet pipe (230), and the extension direction of the second groove (102) is parallel to the extension direction of the liquid inlet pipe (240).

9. The battery pack temperature sensing detection system according to claim 7, characterized in that, The battery pack temperature sensing system (200) also includes a detector, which is electrically connected to the first temperature sensor (210) and the second temperature sensor (220).

10. The battery pack temperature sensing detection system according to claim 7, characterized in that, The battery pack temperature sensing system (200) also includes a support member (250) and a battery housing (260). The support member (250) is connected to the first temperature sensor (210), the second temperature sensor (220), and the battery housing (260). The liquid outlet pipe (230) and the liquid inlet pipe (240) are both connected to the battery housing (260).

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