Wiring structure of thermosensitive wire in battery module and battery module

Abstract

The utility model belongs to the technical field of battery fire protection, and discloses a wiring structure of a thermosensitive wire in a battery module and the battery module, the battery module comprises a plurality of battery units arranged in a matrix and a fire extinguishing unit arranged on one side of the plurality of battery units, and the outer side of the thermosensitive wire is sleeved with a glass fiber tube; the number of the thermosensitive lines corresponds to the row number of the battery units, one end of each thermosensitive line is connected with the fire extinguishing unit, and the other end of each thermosensitive line extends along the row direction of the battery module and passes through the detection areas of all the battery units in the corresponding row; or the number of the thermosensitive wires corresponds to the column number of the battery units, one end of each thermosensitive wire is connected with the fire extinguishing unit, and the other end of each thermosensitive wire extends along the column direction of the battery module and passes through the detection areas of all the battery units in the corresponding column. According to the aerosol fire extinguishing device, the thermosensitive lines with the number equal to the row number or the column number of the battery modules are led out, the combustion triggering time of the thermosensitive lines is shortened, the response speed of the aerosol fire extinguishing device is further increased, and it is ensured that the fire extinguishing action can be started in time when a fire occurs.

Description

Technical Field

[0001] The utility model relates to the technical field of battery fire protection, in particular to a wiring structure of a thermal sensitive line in a battery module and a battery module. Background Art

[0002] A battery module is usually composed of a plurality of battery cells arranged in a matrix and equipped with an aerosol fire extinguishing device. In the prior art, the aerosol fire extinguishing device is usually connected to the aerosol fire extinguishing device through a thermal line, which is arranged around all the battery cells so that when the battery module thermal runaway occurs, the thermal line is ignited at an abnormally high temperature, thereby triggering the aerosol fire extinguishing device to start.

[0003] However, when there are many battery cells in a battery module, relying on only one thermistor to monitor the temperature change of the entire battery module may be problematic. If the high temperature point is far away from the aerosol fire extinguishing device, the thermistor will take a long time to burn before triggering the aerosol fire extinguishing device, resulting in the aerosol device not being activated in time and missing the best time to extinguish the fire. Utility Model Content

[0004] The utility model aims to provide a wiring structure of a thermistor in a battery module and a battery module, so as to solve the problem in the prior art that since the aerosol fire extinguishing device is connected to each battery unit only through a single thermistor, when the high temperature point is far away from the aerosol fire extinguishing device, the thermistor is too long, and its combustion triggering time is prolonged, resulting in the fire extinguishing device being unable to start in time, thereby missing the best fire extinguishing opportunity. The present application can effectively reduce the combustion triggering time of the thermistor by leading out the number of thermistors equal to the number of rows or columns of the battery module, thereby improving the response speed of the aerosol fire extinguishing device, and ensuring that the fire extinguishing action can be started in time when a fire occurs.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A wiring structure of a heat-sensitive wire in a battery module, the battery module comprising a plurality of battery cells arranged in a matrix and a fire extinguishing unit arranged on one side of the plurality of battery cells, the outer side of the heat-sensitive wire being sheathed with a glass fiber tube;

[0007] The number of the thermal wires corresponds to the number of rows of the battery cells, one end of the thermal wire is connected to the fire extinguishing unit, and the other end extends along the row direction of the battery module and passes through the detection areas of all the battery cells in the corresponding row;

[0008] or;

[0009] The number of the thermal wires corresponds to the number of columns of the battery cells. One end of the thermal wire is connected to the fire extinguishing unit, and the other end extends along the column direction of the battery module and passes through the detection areas of all the battery cells in the corresponding column.

[0010] In some embodiments, the detection area is an area extending outward from the detection point of the battery cell and covering 4 mm to 6 mm.

[0011] In some embodiments, the detection point is any one of the positive electrode, the negative electrode, and the pressure relief valve of the battery cell.

[0012] In some embodiments, the fire extinguishing unit has a plurality of wire outlets, and the wire outlets are connected to the thermal sensitive wires in a one-to-one manner;

[0013] Alternatively, each of the wire outlets is connected to at least two of the thermal-sensitive wires via a wire splitter.

[0014] In some embodiments, the splitter is a multi-ventilation tube.

[0015] The present application also provides a battery module, comprising the wiring structure as described above.

[0016] Due to the application of the above technical solution, the beneficial effects of the present application compared with the prior art are:

[0017] The present application is provided with a plurality of thermistor wires corresponding to the number of rows or columns of battery cells. One end of these thermistor wires is connected to the fire extinguishing unit, and the other end extends along the row or column direction of the battery module, and passes through the detection area of ​​all battery cells in the corresponding row or column, so as to realize the separate detection of battery cells in different rows or columns. Compared with the prior art that only uses one long thermistor wire to detect all battery cells, this wiring method significantly reduces the reaction time of the thermistor wire triggering the fire extinguishing unit and improves the fire extinguishing response speed. This design ensures that the fire extinguishing device can be quickly activated when a fire occurs, and solves the problem in the prior art that the fire extinguishing unit is not activated in time due to the high temperature point being far away from the fire extinguishing unit, which makes the thermistor wire burn for too long, effectively ensuring the safety of the battery module.

[0018] At the same time, a glass fiber tube is sheathed on the outside of the thermal wire to prevent the sparks generated by the thermal wire from igniting the combustible gas generated by the thermal runaway of the battery module, thereby improving safety. It can also prevent the thermal wire from direct contact with the external environment or other components, and prevent the thermal wire from breaking or being damaged due to wear, extrusion or other mechanical reasons, so that the fire extinguishing unit will not fail due to the breakage of the thermal wire, thereby ensuring the reliability of the fire extinguishing unit. In addition, it also makes the installation of the thermal wire more convenient and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a battery module in one embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1-thermal wire; 2-fire extinguishing unit; 3-battery unit; 5-positive electrode; 6-negative electrode; 7-pressure relief valve; 8-wire outlet. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0027] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] See also Figure 1 The battery module in one embodiment of the present application includes a plurality of battery cells 3 arranged in a matrix, a fire extinguishing unit 2 arranged on one side of the plurality of battery cells 3, and a plurality of thermal wires 1. A glass fiber tube is sheathed on the outer side of the thermal wire 1. It should be noted that the fire extinguishing unit 2 can be specifically an aerosol fire extinguishing device, which is a conventional structure and will not be elaborated in detail here.

[0030] In the battery module of this embodiment, the wiring structure of the plurality of thermal lines 1 is as follows:

[0031] The number of thermistor wires 1 corresponds to the number of rows of battery cells 3, one end of the thermistor wire 1 is connected to the fire extinguishing unit 2, and the other end extends along the row direction of the battery module and passes through the detection areas of all battery cells 3 in the corresponding row; or the number of thermistor wires 1 corresponds to the number of columns of battery cells 3, one end of the thermistor wire 1 is connected to the fire extinguishing unit 2, and the other end extends along the column direction of the battery module and passes through the detection areas of all battery cells 3 in the corresponding column.

[0032] In some embodiments, the detection area is an area extending 4 mm to 6 mm from the detection point of the battery cell 3. Preferably, the distance between the thermistor 1 and the detection point is 5 mm, which is not specifically limited in the present application.

[0033] In some embodiments, the detection point is any one of the positive electrode 5 , the negative electrode 6 , and the pressure relief valve 7 of the battery cell 3 .

[0034] In some embodiments, the fire extinguishing unit 2 has a plurality of outlets 8 , and the outlets 8 are connected to the thermal wires 1 in a one-to-one manner; or each outlet 8 is connected to at least two thermal wires 1 via a wire splitter.

[0035] In detail, when the number of outlets 8 is greater than or equal to the number of rows or columns of the battery cells 3, the outlets 8 are connected to the thermal wires 1 in a one-to-one manner; when the number of outlets 8 is less than the number of rows or columns of the battery cells 3, the outlets 8 are connected to at least two thermal wires 1 through a wire splitter, which is specifically a multi-ventilation tube. This is a conventional structure and will not be described in detail here.

[0036] Due to the application of the above technical solution, the beneficial effects of the present application compared with the prior art are:

[0037] The present application is provided with a plurality of thermistor wires corresponding to the number of rows or columns of battery cells. One end of these thermistor wires is connected to the fire extinguishing unit, and the other end extends along the row or column direction of the battery module, and passes through the detection area of ​​all battery cells in the corresponding row or column, so as to realize the separate detection of battery cells in different rows or columns. Compared with the prior art that only uses one long thermistor wire to detect all battery cells, this wiring method significantly reduces the reaction time of the thermistor wire triggering the fire extinguishing unit and improves the fire extinguishing response speed. This design ensures that the fire extinguishing device can be quickly activated when a fire occurs, and solves the problem in the prior art that the fire extinguishing unit is not activated in time due to the high temperature point being far away from the fire extinguishing unit, which makes the thermistor wire burn for too long, effectively ensuring the safety of the battery module.

[0038] At the same time, a glass fiber tube is sheathed on the outside of the thermal wire to prevent the sparks generated by the thermal wire from igniting the combustible gas generated by the thermal runaway of the battery module, thereby improving safety. It can also prevent the thermal wire from direct contact with the external environment or other components, and prevent the thermal wire from breaking or being damaged due to wear, extrusion or other mechanical reasons, so that the fire extinguishing unit will not fail due to the breakage of the thermal wire, thereby ensuring the reliability of the fire extinguishing unit. In addition, it also makes the installation of the thermal wire more convenient and reliable.

[0039] Finally, it should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A wiring structure of a thermal sensitive line in a battery module, wherein the battery module comprises a plurality of battery cells arranged in a matrix and a fire extinguishing unit arranged on one side of the plurality of battery cells, characterized in that: The outer side of the thermal line is sheathed with a glass fiber tube; The number of the thermal wires corresponds to the number of rows of the battery cells, one end of the thermal wire is connected to the fire extinguishing unit, and the other end extends along the row direction of the battery module and passes through the detection areas of all the battery cells in the corresponding row; or; The number of the thermal wires corresponds to the number of columns of the battery cells. One end of the thermal wire is connected to the fire extinguishing unit, and the other end extends along the column direction of the battery module and passes through the detection areas of all the battery cells in the corresponding column.

2. The wiring structure according to claim 1, characterized in that: The detection area is an area extending outward from the detection point of the battery unit and covering 4 mm to 6 mm.

3. The wiring structure according to claim 2, characterized in that: The detection point is any one of the positive electrode, the negative electrode, and the pressure relief valve of the battery unit.

4. The wiring structure according to claim 1, wherein: The fire extinguishing unit has a plurality of wire outlets, and the wire outlets are connected to the thermal sensitive wires in a one-to-one manner; Alternatively, each of the wire outlets is connected to at least two of the thermal-sensitive wires via a wire splitter.

5. The wiring structure according to claim 4, characterized in that: The splitter is a multi-ventilation tube.

6. A battery module, characterized in that: Comprising the wiring structure according to any one of claims 1 to 5.

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