NTC temperature sensor, temperature detection wire harness and battery module

Abstract

The utility model provides an NTC temperature sensor, a temperature detection wire harness and a battery module. The NTC temperature sensor comprises wires and a detection probe, the wires comprise a first wire and a second wire, the detection probe is electrically connected with the first wire and the second wire, the NTC temperature sensor further comprises a normally-open temperature switch, the detection probe is connected with the normally-open temperature switch in parallel, and the detection probe is used for detecting the temperature in real time. The normally-open temperature switch is used for being closed when the preset temperature is detected, so that the detection probe is short-circuited. Therefore, under the condition that an NTC temperature sensor is not added, the number of detection points of the battery module is increased, so that more battery cell monomers can be directly detected, and the accuracy of temperature detection is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery modules, and in particular to an NTC temperature sensor, a temperature detection harness, and a battery module. Background Art

[0002] When a short circuit occurs between the positive and negative electrodes within a battery module, a large amount of heat is instantly generated, causing the battery temperature to rise rapidly, potentially triggering thermal runaway. When a battery module is overcharged, the electrolyte within the module decomposes, generating large amounts of gas and heat, causing the module temperature to rise rapidly. Overcharging can also cause increased pressure within the module, further exacerbating the risk of thermal runaway. As battery modules age, the electrolyte within the module gradually decomposes and ages, leading to decreased module capacity, increased internal resistance, and poor heat dissipation. These issues can all potentially trigger thermal runaway. Therefore, temperature monitoring of the battery module is crucial.

[0003] In related technologies, to suppress thermal runaway, the temperature of the battery module is generally detected by an NTC (negative temperature coefficient thermistor) temperature sensor, such as the CN102636284A-NTC surface temperature sensor. The probe of the NTC temperature sensor contacts the battery cell of the battery module and detects the temperature of the battery cell through the probe.

[0004] However, due to cost considerations, the number of NTC temperature sensors is typically less than the number of cells in a battery module. Each NTC temperature sensor has only one probe, which means some cells cannot be directly detected. When the temperature of a cell not directly detected is abnormal, the NTC temperature sensor cannot detect it in time, and the battery management system cannot issue an alert in time, resulting in poor temperature detection accuracy. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide an NTC temperature sensor, a temperature detection wiring harness, and a battery module that improve the accuracy of temperature detection.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] An NTC temperature sensor includes a wire and a detection probe, wherein the wire includes a first wire and a second wire, and the detection probe is electrically connected to the first wire and the second wire respectively. The NTC temperature sensor also includes a normally open temperature switch, and the detection probe and the normally open temperature switch are connected in parallel. The detection probe is used to detect temperature in real time, and the normally open temperature switch is used to close when a predetermined temperature is detected, thereby short-circuiting the detection probe.

[0008] In some embodiments, the NTC temperature sensor further includes parallel wires, the parallel wires including a first parallel wire and a second parallel wire, the first parallel wire being electrically connected to the positive electrode of the normally-open temperature switch and the first wire, respectively, and the second parallel wire being electrically connected to the negative electrode of the normally-open temperature switch and the second wire, respectively.

[0009] In some embodiments, the detection probe is electrically connected to the first end of the first wire and the first end of the second wire respectively, the first end of the first parallel wire is electrically connected to the first wire, and the first end of the second parallel wire is electrically connected to the second wire.

[0010] In some embodiments, the first end of the first parallel line is staggered with the first end of the first conductor, and the first end of the second parallel line is staggered with the first end of the second conductor.

[0011] In some embodiments, there are multiple normally-open temperature switches, and each normally-open temperature switch is connected in parallel with the detection probe.

[0012] A temperature detection harness comprises a plurality of NTC temperature sensors according to any one of the above embodiments. The temperature detection harness further comprises a connector, to which a wire of each NTC temperature sensor is fixedly connected.

[0013] In some embodiments, the second end of the wire of each NTC temperature sensor is fixedly connected to the connector, and the connector is used to connect to the BMS board, so that the wire of each NTC temperature sensor is electrically connected to the BMS board.

[0014] A battery module includes the temperature detection harness described in any of the above embodiments, and the battery module also includes multiple battery cells. The multiple detection probes and the multiple normally open temperature switches together constitute multiple detection components, and the multiple detection components are respectively used to detect the temperatures of the multiple battery cells.

[0015] In some embodiments, the battery module further includes a plurality of metal connecting plates, and the plurality of battery cells are electrically connected via the plurality of metal connecting plates.

[0016] In some embodiments, the plurality of detection members are respectively connected to the plurality of metal connecting pieces, so that the plurality of detection members are respectively used to detect the temperature of the plurality of battery cells.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] The above-mentioned NTC temperature sensor also includes a normally open temperature switch, which is connected in parallel with the detection probe. When the normally open temperature switch detects a predetermined temperature, the normally open temperature switch closes, causing the detection probe to short-circuit, thereby causing the resistance value detected by the battery management system to be 0. The battery management system determines that it is a temperature anomaly based on the sudden change in resistance and issues an alarm, so that the normally open temperature switch can be used to detect temperature anomalies; and because the detection probe can detect temperature anomalies in real time, each NTC temperature sensor has multiple detection points, so that each NTC temperature sensor can detect temperature anomalies in multiple parts; because each NTC temperature sensor can detect temperature anomalies in multiple parts, without adding more NTC temperature sensors, the detection points of the battery module are increased, so that more battery cells can be directly detected, thereby improving the accuracy of temperature detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of a temperature detection harness according to an embodiment;

[0021] Figure 2 Schematic diagram of the structure of a battery module according to one embodiment;

[0022] Figure 3 for Figure 2 A schematic structural diagram of the battery module from another perspective;

[0023] Figure 4 for Figure 3 An enlarged schematic diagram of the battery module at point A.

[0024] Reference numerals: 10, temperature detection harness; 100, NTC temperature sensor; 110, wire; 120, detection probe; 130, normally open temperature switch; 140, parallel line; 200, connector; 20, battery cell; 30, metal connecting piece. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0029] like Figure 1 As shown, an NTC temperature sensor 100 according to one embodiment includes a conductor 110 and a detection probe 120. The conductor 110 includes a first conductor and a second conductor, and the detection probe 120 is electrically connected to the first conductor and the second conductor, respectively. The NTC temperature sensor 100 also includes a normally open temperature switch 130. The detection probe 120 and the normally open temperature switch 130 are connected in parallel. The detection probe 120 is used to detect temperature in real time. The normally open temperature switch 130 is configured to close upon detecting a predetermined temperature, thereby short-circuiting the detection probe 120.

[0030] like Figure 1As shown, in this embodiment, the detection probe 120 and the normally-open temperature switch 130 are respectively in contact with different parts of the product to be inspected. For example, the detection probe 120 and the normally-open temperature switch 130 are respectively in contact with different battery cells 20, so that the detection probe 120 and the normally-open temperature switch 130 are respectively used to monitor the temperature of different battery cells 20. When the detection probe 120 detects a preset temperature, the resistance of the detection probe 120 changes to the preset resistance. At this time, the battery management system detects the preset resistance and issues an alarm. When the normally-open temperature switch 130 detects a predetermined temperature, for example, 110°C to 120°C, the normally-open temperature switch 130 closes, causing the detection probe 120 to short-circuit. At this time, the resistance detected by the battery management system is 0. The battery management system determines that the temperature is abnormal based on the sudden change in resistance and issues an alarm.

[0031] It can be understood that the temperature threshold of the normally open temperature switch 130 is not limited to 110°C to 120°C, and can be set according to the actual detection product. The setting of the temperature threshold of the normally open temperature switch 130 can be achieved by selecting normally open temperature switches 130 of different specifications.

[0032] It can also be understood that the signal transmission method between the NTC temperature sensor 100 and the battery management system belongs to conventional technology and is not within the scope of protection of this disclosure. This disclosure protects the structure and position connection relationship of the NTC temperature sensor 100, the temperature detection harness 10 and the battery module.

[0033] The above-mentioned NTC temperature sensor 100 also includes a normally open temperature switch 130, which is connected in parallel with the detection probe 120. When the normally open temperature switch 130 detects a predetermined temperature, the normally open temperature switch 130 closes, causing the detection probe 120 to short-circuit, thereby causing the resistance value detected by the battery management system to be 0. The battery management system determines that the sudden change in resistance is a temperature anomaly and issues an alarm, allowing the normally open temperature switch 130 to be used to detect temperature anomalies. Since the detection probe 120 can detect temperature anomalies in real time, each NTC temperature sensor 100 has multiple detection points, and thus each NTC temperature sensor 100 can detect temperature anomalies in multiple locations. Since each NTC temperature sensor 100 can detect temperature anomalies in multiple locations, the detection points of the battery module are increased without adding NTC temperature sensors 100, so that more battery cells 20 can be directly detected, thereby improving the accuracy of temperature detection.

[0034] like Figure 1As shown, in some embodiments, the NTC temperature sensor 100 further includes a parallel line 140, and the parallel line 140 includes a first parallel line and a second parallel line. The first parallel line is electrically connected to the positive electrode and the first wire of the normally-open temperature switch 130, respectively, and the second parallel line is electrically connected to the negative electrode and the second wire of the normally-open temperature switch 130, respectively, so that the normally-open temperature switch 130 and the detection probe 120 are connected in parallel.

[0035] like Figure 1 As shown, in some embodiments, the detection probe 120 is electrically connected to the first end of the first wire and the first end of the second wire, respectively, the first end of the first parallel wire is electrically connected to the first wire, and the first end of the second parallel wire is electrically connected to the second wire, so that the lengths of the first wire and the second wire are fully utilized, so that after the second end of the first wire and the second end of the second wire are fixed, the detection probe 120 has greater flexibility.

[0036] like Figure 1 As shown, further, the first end of the first parallel line is staggered with the first end of the first wire, and the first end of the second parallel line is staggered with the first end of the second wire, which reduces the impact of the parallel line 140 on the movement of the detection probe 120 and improves the flexibility of the movement of the detection probe 120.

[0037] In some embodiments, there are multiple normally-open temperature switches 130, and each normally-open temperature switch 130 is connected in parallel with the detection probe 120, so that each NTC temperature sensor 100 has at least 3 detection points, further increasing the detection points of the battery module, so that more battery cells 20 can be directly detected, further improving the accuracy of temperature detection.

[0038] like Figure 1 As shown, the present disclosure further provides a temperature detection harness 10, comprising a plurality of NTC temperature sensors 100 according to any of the above embodiments. The temperature detection harness 10 further comprises a connector 200, wherein the wires 110 of each NTC temperature sensor 100 are fixedly connected to the connector 200. By moving the connector 200, all NTC temperature sensors 100 can be moved, thereby improving the convenience of moving the NTC temperature sensors 100.

[0039] like Figure 1As shown, further, the second end of the wire 110 of each NTC temperature sensor 100 is fixedly connected to the connector 200. The connector 200 is used to connect to the BMS board, so that the wire 110 of each NTC temperature sensor 100 is electrically connected to the BMS board. In this embodiment, the second end of the wire 110 of each NTC temperature sensor 100 is fixedly connected to the connector 200, so that the second ends of the wires 110 of multiple NTC temperature sensors 100 are gathered on the connector 200 to form a wiring harness. By connecting the connector 200 to the BMS board, the wire 110 of each NTC temperature sensor 100 can be electrically connected to the BMS board, thereby improving the convenience and efficiency of installing the NTC temperature sensor 100.

[0040] like Figure 2 and Figure 3 As shown, the present disclosure also provides a battery module, including the temperature detection harness 10 described in any of the above embodiments, the battery module also includes a plurality of battery cells 20, a plurality of detection probes 120 and a plurality of normally open temperature switches 130 together forming a plurality of detection parts, and the plurality of detection parts are respectively used to detect the temperature of the plurality of battery cells 20.

[0041] In the above-mentioned battery module, the NTC temperature sensor 100 also includes a normally open temperature switch 130, which is connected in parallel with the detection probe 120. When the normally open temperature switch 130 detects a predetermined temperature, the normally open temperature switch 130 closes, causing the detection probe 120 to short-circuit, thereby causing the resistance value detected by the battery management system to be 0. The battery management system determines that the temperature is abnormal based on the sudden change in resistance and issues an alarm, so that the normally open temperature switch 130 can be used to detect temperature abnormalities; and because the detection probe 120 can detect temperature abnormalities in real time, each NTC temperature sensor 100 has multiple detection points, so that each NTC temperature sensor 100 can detect temperature abnormalities in multiple locations; because each NTC temperature sensor 100 can detect temperature abnormalities in multiple locations, the detection points of the battery module are increased without adding NTC temperature sensors 100, so that more battery cells 20 can be directly detected, thereby improving the accuracy of temperature detection.

[0042] like Figure 3 As shown, in some embodiments, the battery module further includes a plurality of metal connecting pieces 30 , and the plurality of battery cells 20 are electrically connected via the plurality of metal connecting pieces 30 to increase the capacity of the battery module.

[0043] like Figure 3 and Figure 4As shown, in some embodiments, multiple detection components are respectively connected to multiple metal connecting pieces 30, so that the multiple detection components are respectively used to detect the temperature of multiple battery cells 20. In this embodiment, because the metal connecting pieces 30 are electrically connected to the corresponding battery cells 20 and the metal connecting pieces 30 have high thermal conductivity, the heat of the battery cells 20 can be directly transferred to the metal connecting pieces 30, that is, the metal connecting pieces 30 can effectively transfer the temperature of the battery cells 20. In addition, because the multiple detection probes 120 and the multiple normally open temperature switches 130 together constitute the multiple detection components, the multiple detection components are respectively connected to the multiple metal connecting pieces 30, making temperature detection more timely and further improving the accuracy of temperature detection.

[0044] Compared with the prior art, the present disclosure has at least the following advantages:

[0045] The NTC temperature sensor 100 further includes a normally-open temperature switch 130, which is connected in parallel with the detection probe 120. When the normally-open temperature switch 130 detects a predetermined temperature, the normally-open temperature switch 130 closes, causing the detection probe 120 to short-circuit, thereby causing the resistance value detected by the battery management system to be 0. The battery management system determines that the sudden change in resistance is a temperature anomaly and issues an alarm, allowing the normally-open temperature switch 130 to be used to detect temperature anomalies. Since the detection probe 120 can detect temperature anomalies in real time, each NTC temperature sensor 100 has multiple detection points, allowing each NTC temperature sensor 100 to detect temperature anomalies in multiple locations. Since each NTC temperature sensor 100 can detect temperature anomalies in multiple locations, the detection points of the battery module are increased without adding NTC temperature sensors 100, allowing more battery cells 20 to be directly detected, thereby improving the accuracy of temperature detection.

[0046] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. An NTC temperature sensor, comprising a wire (110) and a detection probe (120), wherein the wire (110) comprises a first wire and a second wire, and the detection probe (120) is electrically connected to the first wire and the second wire, respectively, characterized in that: The NTC temperature sensor further comprises a normally open temperature switch (130), the detection probe (120) and the normally open temperature switch (130) are connected in parallel, the detection probe (120) is used for real-time temperature detection, and the normally open temperature switch (130) is used for closing when a predetermined temperature is detected, thereby short-circuiting the detection probe (120).

2. The NTC temperature sensor according to claim 1, characterized in that The NTC temperature sensor further includes a parallel line (140), the parallel line (140) including a first parallel line and a second parallel line, the first parallel line being electrically connected to the positive electrode of the normally open temperature switch (130) and the first conducting wire, respectively, and the second parallel line being electrically connected to the negative electrode of the normally open temperature switch (130) and the second conducting wire, respectively.

3. The NTC temperature sensor according to claim 2, characterized in that: The detection probe (120) is electrically connected to the first end of the first wire and the first end of the second wire respectively, the first end of the first parallel wire is electrically connected to the first wire, and the first end of the second parallel wire is electrically connected to the second wire.

4. The NTC temperature sensor according to claim 3, characterized in that The first end of the first parallel line is staggered with the first end of the first conductive line, and the first end of the second parallel line is staggered with the first end of the second conductive line.

5. The NTC temperature sensor according to claim 1, characterized in that: There are multiple normally open temperature switches (130), and each normally open temperature switch (130) is connected in parallel with the detection probe (120).

6. A temperature detection harness, characterized in that: The temperature detection harness comprises a plurality of NTC temperature sensors (100) according to any one of claims 1 to 5, wherein the temperature detection harness further comprises a connector (200), and the wires (110) of the respective NTC temperature sensors (100) are fixedly connected to the connector (200).

7. The temperature detection harness according to claim 6, characterized in that: The second end of the wire (110) of each NTC temperature sensor (100) is fixedly connected to the connector (200), and the connector (200) is used to connect to the BMS board, so that the wire (110) of each NTC temperature sensor (100) is electrically connected to the BMS board.

8. A battery module, characterized in that: The temperature detection harness (10) according to claim 6 or 7 is included, and the battery module further includes a plurality of battery cells (20). The plurality of detection probes (120) and the plurality of normally open temperature switches (130) together constitute a plurality of detection components, and the plurality of detection components are respectively used to detect the temperature of the plurality of battery cells (20).

9. The battery module according to claim 8, characterized in that: The battery module further comprises a plurality of metal connecting pieces (30), and the plurality of battery cell units (20) are electrically connected via the plurality of metal connecting pieces (30).

10. The battery module according to claim 9, characterized in that: The plurality of detection members are respectively connected to the plurality of metal connecting pieces (30), so that the plurality of detection members are respectively used to detect the temperature of the plurality of battery cell units (20).

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