Dot-matrix temperature measurement assembly, method, medium and equipment

Abstract

A dot-matrix temperature measurement assembly, method, medium and device used in a battery module, in the assembly, a support is connected with the battery module and covers the surface of a tab of the battery module, a plurality of groups of temperature measurement points are arranged on the support in parallel, and each group of temperature measurement points corresponds to the tab. Each group of temperature measuring points comprises a thermistor and a thermoswitch which are connected in series, the two sampling terminals are respectively connected with two ends of the plurality of groups of temperature measuring points, and the BMS unit is connected with the two sampling terminals through a BMS interface. According to the assembly, temperature early warning and monitoring of any string of battery cells in the module can be achieved only through a small number of BMS sampling interfaces, no additional supporting parts are additionally arranged, and the grouping efficiency is basically not reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery module temperature measurement, and in particular to a dot matrix temperature measurement component, method, medium and device used in a battery module. Background Art

[0002] Thermal safety is the focus and hot topic of current research on power battery modules and systems. The traditional battery safety monitoring method mainly uses PTC or NTC thermistors as battery temperature sensors, which are inserted into the battery or attached to the outer wall of the battery for temperature measurement. The temperature measurement data is transmitted to the BMS system to achieve real-time monitoring of the battery temperature. Thermal safety is one of the key issues in battery safety applications. The most rational state is to monitor the temperature of each battery cell and immediately alarm when an abnormality is found. However, the traditional method of directly arranging thermistor sampling on each battery cell will occupy a lot of BMS sampling interfaces.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

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

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A dot matrix temperature measuring component for a battery module of the present invention comprises:

[0007] A bracket connected to the battery module and covering the surface of the tab of the battery module,

[0008] A plurality of groups of temperature measuring points are arranged in parallel on the bracket and each group of temperature measuring points corresponds to the surface of the tab, and each group of temperature measuring points includes a thermistor and a thermal switch connected in series.

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

[0010] The BMS unit is connected to the two sampling terminals via a BMS interface.

[0011] In the dot matrix temperature measuring component used in the battery module, the thermal switch is normally open and turns to a closed state when the warning temperature is exceeded.

[0012] In the dot matrix temperature measuring component used in the battery module, the bracket is made of a material with good insulation, good thermal conductivity and high temperature resistance, and its thermal conductivity is greater than 200W / mk and its resistivity is greater than 10 13 Ωmm.

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

[0014] In the dot matrix temperature measurement component used in the battery module, the battery module is composed of 1 parallel and 16 series battery cells, and the tabs of every two battery cells are connected to 8 bus bars at both ends of the battery module by welding.

[0015] In the dot matrix temperature measurement component used in the battery module, when the cell tab temperature exceeds 60°C, the thermistor is switched from an open state to a closed state, and the thermistor connected in series with the thermistor 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 the battery module, the sampling terminal includes a monitoring circuit connection line derived from a plurality of groups of parallel temperature measurement point circuits.

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

[0018] The bracket is connected to the battery module and covers the surface of the tab of the battery module. A plurality of groups of temperature measuring points are arranged in parallel on the bracket and each group of temperature measuring points corresponds to the tab.

[0019] The two sampling terminals are connected to the two ends of multiple groups of temperature measurement points respectively, and 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 preset temperature, the thermistor connected in series with the thermistor is connected to the monitoring circuit, and the BMS unit obtains the temperature information.

[0021] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described above.

[0022] An electronic device, comprising:

[0023] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the method described is implemented when the processor executes the program.

[0024] In the above technical scheme, the present invention provides a dot matrix temperature measurement component and method for a battery module, which has the following beneficial effects: it can monitor whether the temperature of each battery in the battery pack exceeds the warning value, and only occupies a small number of BMS sampling interfaces. A thermal conductive sheet with high thermal conductivity and high insulation performance is used as a bracket to connect the tabs of each battery cell in the battery module. One side of the thermal conductive sheet is tightly fitted with the tabs through thermal conductive glue, and a number of thermal switches are placed on the other side, and corresponding to the position of each battery cell tab, a number of thermal switches are connected in parallel, and the thermal switches are normally open. In this way, when the temperature of the battery cell tab at a certain position rises, the high-temperature tab can quickly transfer heat to the thermistor through the thermal conductive sheet, and the thermistor switch action is caused to the warning value, and the thermistor is closed. The thermistor is connected in series with the thermistor, so only the data of the thermistor that causes the closing action of the thermistor will transmit the temperature data of the corresponding high-temperature tab to the BMS. This scheme only requires a small number of BMS sampling interfaces to realize the temperature warning monitoring of any series of batteries in the module.

[0025] The present invention connects the thermal switch and the thermistor in series to verify each other, thereby avoiding false alarms of temperature monitoring data. The thermistor and the thermal switch are placed on a bracket and are made of materials with good insulation and thermal conductivity. The thermistor and the thermal switch are placed on a bracket such as a cover plate and are made of materials with good insulation and thermal conductivity. The cover plate covers the surface of the pole ear and can also play a role in insulating and protecting the pole ear. Battery modules generally include two parts: a copper busbar bracket and a pole ear cover plate. Therefore, the present invention does not add additional supporting components and basically does not reduce the grouping efficiency. In addition, the thermistor and the thermal switch are prefabricated on the bracket or cover plate to facilitate module assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic structural diagram of a dot matrix temperature measurement component for a battery module provided in one embodiment of the present invention.

[0028] Figure 2 for Figure 1 An embodiment of the present invention provides a schematic diagram of a partially enlarged structure of a dot matrix temperature measurement component used in a battery module.

[0029] Figure 3 A connection diagram of a dot matrix temperature measurement component used in a battery module provided by one embodiment of the present invention.

[0030] Description of reference numerals:

[0031] Bracket 1, temperature measuring point 2, sampling terminal 3, BMS unit 4, thermistor 5, thermal switch 6, battery cell 7, bus bar 8, tab 9, tab surface 10. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In order 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 also Figure 1-3 As shown, in one embodiment, a dot matrix temperature measurement component for a battery module of the present invention includes:

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

[0042] A plurality of groups of temperature measuring points 2 are arranged in parallel on the support 1 and each group of temperature measuring points 2 corresponds to the surface of the tab 10. Each group of temperature measuring points 2 includes a thermistor 5 and a thermal switch 6 connected in series.

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

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

[0045] In the preferred embodiment of the dot matrix temperature measuring component used in the battery module, the thermal switch 6 is normally open and turns to a closed state when the warning temperature is exceeded.

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

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

[0048] In a preferred embodiment of the dot matrix temperature measurement component used in a battery module, the battery module is composed of 1 parallel and 16 series battery cells 7, and the tabs 9 of every two battery cells 7 are connected to 8 bus bars 8 at both ends of the battery module by welding.

[0049] In a preferred embodiment of the dot matrix temperature measuring component used in a battery module, when the tab temperature of the battery cell 7 exceeds 60°C, the thermal switch 6 is switched from an open state to a closed state, and the thermistor 5 connected in series therewith is connected to a 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 used in a battery module, the sampling terminal 3 includes a monitoring circuit connection line derived from a plurality of parallel circuits of the temperature measurement points 2.

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

[0052] The bracket 1 is connected to the battery module and covers the surface 10 of the tab of the battery module. A plurality of groups of temperature measuring points 2 are arranged in parallel on the bracket 1 and each group of temperature measuring points 2 corresponds to the tab.

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

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

[0055] A computer storage medium includes computer instructions, which, when executed on a computer, cause the computer to execute the method described above.

[0056] In one embodiment, the positions of the thermal switches of each group of temperature measuring points 2 correspond to the positions of the tabs of the battery cells of the battery module. Furthermore, the thermal switches and the tabs are symmetrical with respect to the bracket and are arranged close to the bracket.

[0057] An electronic device, comprising:

[0058] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the method described is implemented when the processor executes the program.

[0059] In one embodiment, a group of temperature measuring points 2 are formed by a thermistor 5 and a thermal switch 6 connected in series, and a cluster of temperature measuring points 2 are formed by several groups connected in parallel. Each cluster is connected to a sampling terminal 3, and the temperature value of the thermistor 5 is transmitted to the BMS through the sampling terminal 3. The thermal switch 6 is normally open and turns to a closed state when the warning temperature is exceeded. The measured temperature point is located at the welding position between the pole ear of each battery cell 7 and the bus 8. There is contact resistance at this position, and the temperature rise is higher. Compared with being placed on the battery cell 7 body, the highest temperature monitoring can be achieved. The thermistor 5 and the thermal switch 6 are placed on the bracket 1, and are made of materials with good insulation and thermal conductivity. They are covered on the surface 10 of the pole ear, and can also play a role in insulating and protecting the pole ear. Only one or two sampling interfaces of the BMS are needed to collect the pole ears of the entire module exceeding the warning temperature. Each cluster of thermistors 5 and thermal switches 6 adopts FPC mode, with less wiring harness, and can be prefabricated and integrated on the bracket 1 or the cover plate, which is convenient for battery module assembly. The thermal switch 6 and thermistor 5 are connected in series to verify each other, avoiding false alarm of early warning temperature monitoring data.

[0060] In one embodiment, the temperature measuring component is used to monitor whether the temperature of each battery cell 7 of the lithium-ion battery module exceeds the warning value. The temperature measuring component includes a group of temperature measuring points 2 composed of a thermistor 5 and a thermal switch 6 connected in series, and several groups of temperature measuring points 2 are connected in parallel to form a cluster of dot matrix temperature measuring points 2. The dot matrix arrangement corresponds to the spatial position of the battery cell 7 tabs. After the parallel lines are aggregated, two lines are led out as monitoring circuit connection lines. The dot matrix temperature measuring points 2 are arranged on the bracket 1. The bracket 1 is made of a material with good insulation, good thermal conductivity and high temperature resistance, including but not limited to aluminum nitride, etc. The thermal conductivity is greater than 200W / mk, and the resistivity is greater than 10 13 Ωmm. The two are brought into close contact through the heat-conducting medium to reduce thermal resistance.

[0061] Applied to soft pack battery modules, such as Figure 2 As shown. The battery module consists of 1 parallel and 16 series battery cells 7, and the tabs of every two battery cells 7 are connected to the bus 8 at both ends of the module by welding. There are 8 bus bars 8 in total, and correspondingly there are 8 temperature measuring points 2 in total, and the dot matrix arrangement is consistent with the spatial position of the bus 8. The dot matrix temperature measuring points 2 are arranged on the bracket 1, and the bracket 1 covers the surface 10 of the tabs, which can also play a role in insulating and protecting the tabs. If the tab temperature of a battery cell 7 exceeds 60°C, the thermal switch 6 is converted from the conventional open state to the closed state, and the thermistor 5 connected in series with it is connected to the monitoring circuit, and the measured temperature value is transmitted to the BMS through the connection money.

[0062] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0063] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that 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 above 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 measurement component used in a battery module, characterized in that: These include, A bracket connected to the battery module and covering the surface of the tab of the battery module, A plurality of groups of temperature measuring points are arranged in parallel on the bracket and each group of temperature measuring points corresponds to the surface of the tab, and each group of temperature measuring points includes a thermistor and a thermal switch connected in series. Two sampling terminals, which are connected to the two ends of multiple groups of temperature measurement points respectively. The BMS unit is connected to the two sampling terminals via a BMS interface.

2. A dot matrix temperature measuring component for a battery module according to claim 1, characterized in that: The thermal switch is normally open and will turn to closed state when the warning temperature is exceeded.

3. A dot matrix temperature measuring component for a battery module according to claim 1, characterized in that: The bracket is made of a material with good insulation, good thermal conductivity and high temperature resistance, and its thermal conductivity is greater than 200W / mk and its resistivity is greater than 10 13 Ωmm.

4. A dot matrix temperature measuring component for a battery module according to claim 1, characterized in that: The support is made of aluminum nitride.

5. A dot matrix temperature measurement component for a battery module according to claim 1, characterized in that: The battery module is composed of 1 parallel and 16 series battery cells, and the tabs of every two battery cells are connected to 8 bus bars at both ends of the battery module by welding.

6. A dot matrix temperature measuring component for a battery module according to claim 1, characterized in that: When the cell tab temperature exceeds 60°C, the thermistor connected in series with the thermistor is connected to the monitoring circuit, so that the measured temperature value is transmitted to the BMS unit.

7. A dot matrix temperature measurement component for a battery module according to claim 1, characterized in that: The sampling terminal includes a monitoring circuit connection line which is derived from a plurality of parallel circuits of temperature measuring points.

8. A temperature measurement method using a dot matrix temperature measurement component used in a battery module according to any one of claims 1 to 7, characterized in that: These include, The bracket is connected to the battery module and covers the surface of the tab of the battery module. A plurality of groups of temperature measuring points are arranged in parallel on the bracket and each group of temperature measuring points corresponds to the surface of the tab. The two sampling terminals are connected to the two ends of multiple groups of temperature measurement points respectively, and the BMS unit is connected to the two sampling terminals via the BMS interface. When the temperature of the battery cell tab exceeds the preset temperature, the thermistor connected in series with the thermistor is connected to the monitoring circuit, and the BMS unit obtains the temperature information.

9. A computer storage medium, characterized in that: The storage medium includes computer instructions, which, when executed on a computer, cause the computer to perform the method as claimed in claim 8 .

10. An electronic device, characterized in that: The electronic device comprises: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to claim 8 is implemented.

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