Dot matrix temperature measurement assembly, method, medium and device

Abstract

A kind of dot matrix temperature measuring component, method, medium and equipment in battery module, in component, support is connected battery module and covers the surface of tab of battery module, and multiple groups of temperature measuring points are arranged in parallel on the support and each group of temperature measuring points corresponds to tab, and each group of temperature measuring points includes series-connected thermistor and thermosensitive switch, two sampling terminals are connected at the two ends of multiple groups of temperature measuring points respectively, and BMS unit is connected with two sampling terminals via BMS interface.This component only needs a small amount of BMS sampling interface, and the temperature early warning monitoring of any string battery cell in module can be realized, and no additional supporting components are added, and the grouping efficiency is basically not reduced.

Description

Technical Field

[0001] This invention relates to the field of battery module temperature measurement technology, and in particular to a dot matrix temperature measurement component, method, medium and device for use in battery modules. Background Technology

[0002] Thermal safety is currently a key focus and hot topic in the research of power battery modules and systems. Traditional battery safety monitoring methods primarily involve using PTC or NTC thermistors as temperature sensors, either inserted into the battery or attached to its outer wall. The measured temperature data is then transmitted to the BMS system for real-time temperature monitoring. Thermal safety is a critical issue in battery safety applications. Ideally, the temperature of each individual cell should be monitored, with immediate alarms triggered upon detecting any anomalies. However, the traditional method of directly placing thermistors on each cell for sampling consumes a significant number of BMS sampling interfaces.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a dot matrix temperature measurement component, method, medium, and device for use in battery modules. It only requires a small number of BMS sampling interfaces to realize temperature early warning monitoring of any series of cells in the module without adding any additional supporting components, and basically does not reduce the assembly efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A dot-matrix temperature sensing component for use in a battery module according to the present invention includes:

[0007] A bracket that connects to the battery module and covers the surface of the battery module's tabs.

[0008] Multiple sets of temperature measuring points are arranged in parallel on the bracket, with each set corresponding to the surface of the electrode tab. Each set of temperature measuring points includes a thermistor and a thermal switch connected in series.

[0009] Two sampling terminals, which are respectively connected to the two ends of multiple temperature measurement points.

[0010] The BMS unit connects to two sampling terminals via the BMS interface.

[0011] In the dot matrix temperature sensing component used in a battery module, the thermal switch is normally open and turns off when the temperature exceeds the warning temperature.

[0012] In the aforementioned dot-matrix temperature sensing component for use in a battery module, the bracket is made of a material with good insulation, good thermal conductivity, and high temperature resistance, with a thermal conductivity greater than 200 W / mK and a resistivity greater than 10. 13 Ωmm.

[0013] In the dot matrix temperature sensing component used in a battery module, the bracket is made of aluminum nitride.

[0014] In the dot matrix temperature sensing component for use in a battery module, the battery module consists of 1 parallel and 16 serial cells, and the tabs of every two cells are connected to 8 busbars at both ends of the battery module by welding.

[0015] In the dot matrix temperature sensing component used in a battery module, when the temperature of the cell tab exceeds 60°C, the thermal switch changes from an open state to a closed state, and the thermistor connected in series with it is connected to the monitoring circuit, so that the measured temperature value is transmitted to the BMS unit.

[0016] In the dot matrix temperature measurement component used in a battery module, the sampling terminal includes a monitoring circuit connection line led out after the parallel connection of multiple temperature measurement points.

[0017] A temperature measurement method for a dot-matrix temperature sensing component in a battery module includes,

[0018] The bracket connects to the battery module and covers the surface of the battery module's tabs. Multiple sets of temperature measuring points are arranged in parallel on the bracket, with each set of measuring points corresponding to a tab.

[0019] Two sampling terminals are connected to the two ends of multiple temperature measurement points respectively. The BMS unit is connected to the two sampling terminals via the BMS interface.

[0020] When the temperature of the battery cell tab exceeds the predetermined temperature, the thermal switch changes from the open state to the closed state, and the thermistor connected in series with it is connected to the monitoring circuit, and the BMS unit obtains the temperature information.

[0021] A computer storage medium including computer instructions that, when run on a computer, cause the computer to perform the method.

[0022] An electronic device, the electronic device comprising:

[0023] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method when executing the program.

[0024] In the above technical solution, the dot-matrix temperature measurement component and method for battery modules provided by the present invention have the following beneficial effects: It enables monitoring of whether the temperature of each battery in the battery pack exceeds the warning value, and occupies only a small number of BMS sampling interfaces. A heat-conducting sheet with high thermal conductivity and high insulation performance is used as a support to connect the tabs of each cell in the battery module. One side of the heat-conducting sheet is tightly attached to the tab by thermally conductive adhesive, and the other side has several thermal switches. Corresponding to the position of each cell tab, the thermal switches are connected in parallel and are normally open. Thus, when the temperature of a cell tab at a certain position rises, the high-temperature tab can quickly transfer heat to the thermistor through the heat-conducting sheet. When the warning value is reached, the thermistor switch is activated and closed. The thermistor is connected in series with the thermal switch; therefore, only the data from the thermistor that causes the thermal switch to close will transmit the temperature data of its corresponding high-temperature tab to the BMS. This solution requires only a small number of BMS sampling interfaces to achieve temperature warning monitoring of any series of cells in the module.

[0025] This invention connects a thermal switch and a thermistor in series for mutual verification, avoiding false alarms in temperature monitoring data. The thermistor and thermal switch are placed on a support and are made of a material with good insulation and thermal conductivity. Alternatively, the thermistor and thermal switch can be placed on a support such as a cover plate, also made of a material with good insulation and thermal conductivity. The cover plate covers the surface of the electrode tabs, providing insulation and protection. Battery modules typically include both copper busbar supports and electrode tab covers; therefore, this invention does not add any extra supporting components and thus does not significantly reduce assembly efficiency. Furthermore, the thermistor and thermal switch are pre-fabricated on the support or cover plate, facilitating module assembly. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic diagram of a dot matrix temperature sensing component for use in a battery module, provided as an embodiment of the present invention.

[0028] Figure 2 for Figure 1 A partially enlarged structural schematic diagram of a dot matrix temperature sensing component for use in a battery module is provided in one embodiment of the present invention.

[0029] Figure 3 This is a connection diagram of a dot matrix temperature sensing component for use in a battery module, provided as an embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Bracket; 2. Temperature measuring point; 3. Sampling terminal; 4. BMS unit; 5. Thermistor; 6. Thermistor switch; 7. Battery cell; 8. Busbar; 9. Tab; 10. Tab surface. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0034] 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.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] See Figure 1-3 As shown, in one embodiment, a dot-matrix temperature sensing component for a battery module according to the present invention includes,

[0041] The bracket 1 connects to the battery module and covers the tab surface 10 of the battery module.

[0042] Multiple sets of temperature measuring points 2 are arranged in parallel on the bracket 1, and each set of temperature measuring points 2 corresponds to the tab surface 10. Each set of temperature measuring points 2 includes a thermistor 5 and a thermal switch connected in series.

[0043] Two sampling terminals 3 are connected to the two ends of multiple temperature measurement points 2, respectively.

[0044] BMS unit 4 is connected to two sampling terminals 3 via BMS interface.

[0045] In a preferred embodiment of the dot matrix temperature sensing component for a battery module, the thermal switch 6 is normally open and turns off when the warning temperature is exceeded.

[0046] In a preferred embodiment of the dot-matrix temperature sensing component for a battery module, the bracket 1 is made of a material with good insulation, good thermal conductivity, and high temperature resistance, with a thermal conductivity greater than 200 W / mK and a resistivity greater than 10. 13 Ωmm.

[0047] In a preferred embodiment of the dot matrix temperature sensing component for a battery module, the bracket 1 is made of aluminum nitride.

[0048] In a preferred embodiment of the dot matrix temperature sensing component for a battery module, the battery module consists of 1 parallel and 16 serial cells 7, and the tabs 9 of every two cells 7 are connected to 8 busbars 8 at both ends of the battery module by welding.

[0049] In a preferred embodiment of the dot matrix temperature sensing component for a battery module, when the electrode temperature of the cell 7 exceeds 60°C, the thermal switch 6 changes from an open state to a closed state, and the thermistor 5 connected in series with it is connected to the monitoring circuit, so that the measured temperature value is transmitted to the BMS unit 4.

[0050] In a preferred embodiment of the dot matrix temperature measurement component for a battery module, the sampling terminal 3 includes a monitoring circuit connection line led out after the parallel lines of multiple temperature measurement points 2 are combined.

[0051] A temperature measurement method for a dot-matrix temperature sensing component in a battery module includes,

[0052] The bracket 1 connects to the battery module and covers the surface 10 of the battery module's tabs. Multiple sets of temperature measuring points 2 are arranged in parallel on the bracket 1, and each set of temperature measuring points 2 corresponds to a tab.

[0053] Two sampling terminals 3 are respectively connected to the two ends of multiple temperature measurement points 2, and the BMS unit 4 is connected to the two sampling terminals 3 via the BMS interface.

[0054] When the temperature of the tab of the battery cell 7 exceeds the predetermined temperature, the thermal switch 6 changes from the open state to the closed state, and the thermistor 5 connected in series with it is connected to the monitoring circuit, and the BMS unit 4 obtains the temperature information.

[0055] A computer storage medium including computer instructions that, when run on a computer, cause the computer to perform the method.

[0056] In one embodiment, the position of the thermal switch at each set of temperature measuring points 2 corresponds to the position of the tab of the battery cell in the battery module. Furthermore, the thermal switch and the tab are arranged symmetrically and closely to the bracket.

[0057] An electronic device, the electronic device comprising:

[0058] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method when executing the program.

[0059] In one embodiment, a set of temperature measuring points 2 consists of a thermistor 5 and a thermal switch 6 connected in series. Several sets are connected in parallel to form a cluster of temperature measuring points 2. Each cluster is connected to a sampling terminal 3, through which the temperature value of the thermistor 5 is transmitted to the BMS. The thermal switch 6 is normally open and turns off when the warning temperature is exceeded. The measured temperature points are located at the welding position between the tab of each cell 7 and the busbar 8. This position has contact resistance and a higher temperature rise, allowing for higher temperature monitoring compared to placing it on the cell body itself. The thermistor 5 and thermal switch 6 are placed on the bracket 1 and are made of a material with good insulation and thermal conductivity, covering the surface 10 of the tab, which also serves as insulation protection for the tab. Only one or two sampling interfaces of the BMS are needed to collect data on the tabs of the entire module when they exceed the warning temperature. Each cluster of thermistors 5 and thermistors 6 uses an FPC method, with fewer wiring harnesses, and can be prefabricated and integrated into the bracket 1 or cover plate, which facilitates battery module assembly. Thermistors 6 and thermistors 5 are connected in series and verify each other, avoiding false alarms in the warning temperature monitoring data.

[0060] In one embodiment, a temperature sensing component is used to monitor whether the temperature of each cell 7 in the lithium-ion battery module exceeds a warning value. This temperature sensing component includes a set of temperature sensing points 2 connected in series with a thermistor 5 and a thermistor switch 6. Several sets of temperature sensing points 2 are connected in parallel to form a cluster of dot-matrix temperature sensing points 2. The dot-matrix arrangement corresponds to the spatial position of the tabs on the cell 7. Two parallel lines are led out as connection lines for the monitoring circuit. The dot-matrix temperature sensing points 2 are arranged on a bracket 1. The bracket 1 is made of a material with good insulation, thermal conductivity, and high temperature resistance, including but not limited to aluminum nitride, with a thermal conductivity greater than 200 W / mK and a resistivity greater than 10. 13 Ωmm. A thermally conductive medium is used to ensure close contact between the two components, reducing thermal resistance.

[0061] Applied to pouch battery modules, such as Figure 2 As shown, the battery module consists of 1 parallel and 16 series cells 7. The tabs of every two cells 7 are connected to the busbars 8 at both ends of the module by welding. There are a total of 8 busbars 8, and correspondingly 8 temperature measuring points 2, with the dot matrix arrangement consistent with the spatial position of the busbars 8. The dot matrix temperature measuring points 2 are arranged on the bracket 1, which covers the surface 10 of the tabs and also provides insulation and protection for the tabs. If the temperature of a certain cell 7 tab exceeds 60°C, the thermal switch 6 changes from the normal open state to the closed state. The thermistor 5 connected in series with it is connected to the monitoring circuit, and through the connection, the measured temperature value is transmitted to the BMS.

[0062] Finally, it should be noted that the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0063] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dot-matrix temperature sensing component for use in a battery module, characterized in that, It includes, A bracket that connects to the battery module and covers the surface of the battery module's tabs. Multiple sets of temperature measuring points are arranged in parallel on the bracket, with each set corresponding to the surface of the electrode tab. Each set of temperature measuring points includes a thermistor and a thermal switch connected in series. Two sampling terminals, which are respectively connected to the two ends of multiple temperature measurement points. The BMS unit connects to two sampling terminals via the BMS interface; The thermal switch is normally open, but turns off when the temperature exceeds the warning level. When the temperature of the battery cell tab exceeds 60°C, the thermal switch changes from the open state to the closed state. The thermistor connected in series with it is connected to the monitoring circuit, so that the measured temperature value is transmitted to the BMS unit.

2. The dot-matrix temperature sensing component for use in a battery module according to claim 1, characterized in that, The bracket is made of a material with good insulation, thermal conductivity, and high temperature resistance, with a thermal conductivity greater than 200 W / mK and a resistivity greater than 10. 13 Ωmm.

3. A dot-matrix temperature sensing component for use in a battery module according to claim 1, characterized in that, The support is made of aluminum nitride.

4. A dot-matrix temperature sensing component for use in a battery module according to claim 1, characterized in that, The battery module consists of 1 parallel and 16 serial cells, with the tabs of every two cells connected to 8 busbars at both ends of the battery module by welding.

5. A dot-matrix temperature sensing component for use in a battery module according to claim 1, characterized in that, The sampling terminal includes the monitoring circuit connection line led out after the parallel circuits of multiple temperature measurement points are combined.

6. A temperature measurement method using a dot-matrix temperature sensing component for a battery module according to any one of claims 1-5, characterized in that, It includes, The bracket connects to the battery module and covers the surface of the battery module's tabs. Multiple sets of temperature measuring points are arranged in parallel on the bracket, with each set of measuring points corresponding to the surface of the tabs. Two sampling terminals are connected to the two ends of multiple temperature measurement points respectively. The BMS unit is connected to the two sampling terminals via the BMS interface. When the temperature of the battery cell tab exceeds the predetermined temperature, the thermal switch changes from the open state to the closed state, and the thermistor connected in series with it is connected to the monitoring circuit, and the BMS unit obtains the temperature information.

7. A computer storage medium, characterized in that, The storage medium includes computer instructions that, when run on a computer, cause the computer to perform the method as described in claim 6.

8. An electronic device, characterized in that, The electronic device includes: Memory, processor, and computer programs stored in memory and executable on the processor, wherein, When the processor executes the program, it implements the method as described in claim 6.

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