Power distribution module, battery pack and power utilization system

Abstract

The utility model discloses a power distribution module, a battery pack and a power utilization system. The power distribution module comprises a working assembly and an optical fiber. Wherein the working assembly is provided with at least one temperature measuring point; the optical fiber is at least partially arranged on the working assembly; at least one grating is arranged in the optical fiber, and the grating is used for sensing the temperature change at the temperature measuring point; two ends of the optical fiber are used for connecting an optical signal emission source and a demodulator. The diameter of the optical fiber is small, the optical fiber is bent, and configuration can be completed only by occupying a small space.

Description

Technical Field

[0001] The present application relates to the field of electricity, and more specifically to a power distribution module, a battery pack and a power consumption system. Background Art

[0002] With the development of new energy technologies, electric vehicles or hybrid vehicles have gradually become the main force of passenger vehicles. As a key component of electric vehicles, power batteries provide energy output for the driving of electric vehicles. A distribution box is set for the power battery, which is mainly used to control the charging, discharging and power distribution of the power battery. During operation, the components in the distribution box will generate a lot of heat, causing the temperature of itself and the surrounding environment to rise. If the temperature in the distribution box is not monitored, it is easy to cause thermal runaway problems in the distribution box. Utility Model Content

[0003] The present utility model is proposed to solve at least one of the above problems. According to the first aspect of the present application, a power distribution module is provided, the power distribution module comprising: a working component and an optical fiber; wherein at least one temperature measuring point is arranged on the working component; the optical fiber is at least partially arranged on the working component; at least one grating is arranged in the optical fiber, the grating is used to sense the temperature change at the temperature measuring point; and the two ends of the optical fiber are respectively used to connect the optical signal emission source and the demodulator.

[0004] In one embodiment of the present application, the working component includes: a component, and at least one temperature measuring point is arranged on the component.

[0005] In one embodiment of the present application, the components include at least one of a relay, a contactor, a fuse, and a connector.

[0006] In one embodiment of the present application, the temperature measuring point is located on the shell surface of the component and / or the shell recess; or / and, the temperature measuring point is located inside the shell of the component; or / and, the temperature measuring point is located at the connection between two components.

[0007] In one embodiment of the present application, the working component further includes: a conductive bar, on which at least one temperature measuring point is disposed.

[0008] In one embodiment of the present application, the temperature measuring point is located on the surface and / or recess of the conductive bar; or / and, the temperature measuring point is located in the gap between two adjacent conductive bars; or / and, the temperature measuring point is located at the connection between two conductive bars; or / and, the temperature measuring point is located at the connection between the conductive bar and the component, wherein the component is located in the accommodating cavity; or / and, the temperature measuring point is located between the conductive bar and the insulating film, wherein the insulating film is wrapped around the outside of the conductive bar.

[0009] In one embodiment of the present application, the working component further includes: components and a conductive bar connected to the components, wherein the connection between the components and the conductive bar has a first temperature zone, and the first temperature zone is provided with at least one temperature measuring point.

[0010] In one embodiment of the present application, the number of the optical fiber is at least one, and each of the optical fibers is provided with at least one grating.

[0011] In one embodiment of the present application, at least three gratings are provided in the optical fiber, and the at least three gratings are arranged at equal intervals along the extension direction of the optical fiber.

[0012] In one embodiment of the present application, the grating is fixed at the temperature measuring point by gluing or locking.

[0013] According to the second aspect of the present application, a battery pack is also provided, comprising: any one of the power distribution modules described above.

[0014] According to a third aspect of the present application, there is also provided an electricity system, which includes any one of the above-mentioned battery packs.

[0015] According to the power distribution module, battery pack and power consumption system provided by the embodiments of the present application, an optical fiber is arranged on the working component, and at least one grating is arranged in the optical fiber. The grating is used to sense the temperature change at the temperature measuring point on the working component to achieve the temperature measurement of the working component. Since the diameter of the optical fiber is small, only a small space is required to complete the configuration, and the optical fiber can be bent. When used, the grating can be used to determine which specific position has a high temperature. For example, based on the length of time the grating detects the light signal, it can be determined that the position of the working component has a high temperature, thereby improving the diffusion and flexibility of temperature monitoring of the power distribution module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic cross-sectional view of a power distribution module provided in one embodiment of the utility model;

[0018] Figure 2 A schematic cross-sectional view of a power distribution module provided in another embodiment of the utility model;

[0019] Figure 3 A schematic top view of a partial structure of a battery pack provided in one embodiment of the utility model.

[0020] Reference numerals:

[0021] 10-accommodation cavity 11-box 20-temperature measurement point 31-optical fiber

[0022] 32- Optical signal transmission source 33- Demodulator 41- Relay

[0023] 42-insurance 43-connector 50-conductive bar

[0024] 61-Battery Energy Distributor 62-Battery Management System DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more obvious, the exemplary embodiments according to the utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments of the utility model, and it should be understood that the utility model is not limited to the exemplary embodiments described here. Based on the embodiments of the utility model described in the utility model, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the utility model.

[0026] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0027] It should be understood that the utility model can be implemented in different forms and should not be interpreted as being limited to the embodiments proposed herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

[0028] In order to thoroughly understand the present invention, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0029] Due to the internal resistance of the distribution module of the battery pack, a large amount of heat will be generated during the operation of the power distribution module, and the energy consumption of the electronic components will also cause the temperature of the battery pack and the surrounding environment to rise. At the same time, the battery itself will also generate a certain amount of heat due to the chemical reaction during the charging and discharging process, further exacerbating the temperature rise. If the heat dissipation is poor or the ambient temperature is high, it is easy to cause the temperature of the distribution module of the battery pack to rise. The long-term high or low temperature operation of the distribution module will affect the life and performance of the distribution module. In severe cases, thermal melting, arcing, and even heat transfer to the battery cell will cause thermal runaway and thermal convection, which will seriously endanger the lives of drivers and passengers. In addition, as the volume energy density of the battery pack becomes higher and higher, the connection distance between the distribution module and the battery cell becomes shorter and shorter. Since the temperature of the distribution module will rise relatively high after high current or long-term operation, which is higher than the battery cell tolerance temperature, it may have an adverse effect on the performance and life of the battery cell. Therefore, it is necessary to pay attention to and solve the problems of heat dissipation and refrigeration of the distribution module. However, due to the extremely small internal space of the distribution module, the temperature measurement element in the related technology cannot be placed inside the distribution module. In addition, there is a large current inside the power distribution module, which is also susceptible to electromagnetic interference. Therefore, how to monitor the temperature field of the power distribution module, especially to collect the highest and lowest temperatures inside the power distribution module, has become a big problem.

[0030] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] The present application embodiment provides a power distribution module, referring to Figure 1 , Figure 2 and Figure 3 The power distribution module includes: a working component and an optical fiber 31; wherein, at least one temperature measuring point 20 is arranged on the working component; the optical fiber 31 is at least partially arranged on the working component; at least one grating is arranged in the optical fiber 31, and the grating is used to sense the temperature change at the temperature measuring point 20; the two ends of the optical fiber 31 are respectively used to connect the optical signal emission source 32 and the demodulator 33.

[0032] In the above scheme, by setting an optical fiber 31 on the working component, at least one grating is set in the optical fiber 31, and the grating is used to sense the temperature change at the temperature measuring point 20 on the working component to achieve temperature measurement of the working component. Since the diameter of the optical fiber 31 is small, only a small space is required to complete the configuration, and the optical fiber 31 can be bent. When applied, the grating can be used to determine which specific position has a high temperature. For example, based on the length of time the grating detects the light signal, it can be determined that the position of the working component has a high temperature, thereby improving the diffusion and flexibility of temperature monitoring of the power distribution module. The above structures are described in detail below in conjunction with the accompanying drawings.

[0033] When setting up your work components, refer to Figure 1 and Figure 2 The working components may be electronic devices or electrical connectors suitable for power distribution, such as but not limited to components, conductive bars 50, etc. Figure 1 and Figure 2 , at least one temperature measuring point 20 is provided on the working component, and each temperature measuring point 20 can be any position point on the working component where the temperature needs to be monitored. Exemplarily, the working component may include components, and the temperature measuring points 20 may be distributed on the components, that is, at least one temperature measuring point 20 is provided on the components, and in this case, part or all of the gratings on the optical fiber 31 are used to monitor the temperature of the components. Exemplarily, the working component may include a conductive bar 50, and the temperature measuring points 20 may be distributed on the conductive bar 50, that is, at least one temperature measuring point 20 is provided on the conductive bar 50, and in this case, part or all of the gratings on the optical fiber 31 are used to monitor the temperature of the conductive bar 50.

[0034] Exemplary, reference Figure 1 , Figure 2 and Figure 3 When setting the working component, the working component can be set in the distribution box. Exemplarily, the distribution box has a receiving cavity 10, and the working component is set in the receiving cavity 10. When setting the receiving cavity 10 of the distribution box, refer to Figure 1 and Figure 2 , the accommodating cavity 10 can be any space that can accommodate components and / or conductive bars 50. For example, the distribution box may include a box body 11, the interior of the box body 11 has a hollow accommodating cavity 10, and the box body 11 can be surrounded by a plurality of wall panels to form a relatively closed space as the accommodating cavity 10. Exemplarily, when the distribution box is formed in the box body 11 of the battery pack, the distribution box can be set on one side of the battery pack, and the batteries of the battery pack and the distribution box can be separated by one or more wall panels to enclose the accommodating cavity 10 of the distribution box. Exemplarily, as Figure 1 and Figure 2At least one temperature measuring point 20 may also be provided in the receiving chamber 10 of the distribution box, and each temperature measuring point 20 may be any position in the receiving chamber 10 where the temperature needs to be monitored. Exemplarily, the temperature measuring point 20 may also be provided on the wall of the receiving chamber 10 or at a suspended position, so as to detect the temperature at different positions in the receiving chamber 10.

[0035] When determining the type of the component, it can be any type of electronic component. Figure 1 , Figure 2 and Figure 3 , exemplarily, the components may include at least one of a relay 41, a contactor, a fuse 42, and a connector 43. Specifically, the components in the working assembly may include a relay 41 or a contactor. The components in the working assembly may also include a fuse 42, and the type of the fuse 42 may be a smart fuse or a common fuse. The components in the working assembly may also include a connector 43. In some embodiments, the components may also be a device composed of components such as a relay 41, a contactor, and a fuse 42 to realize a certain power distribution function, for example, referring to Figure 3 , the component can also be a battery energy distributor 61.

[0036] When setting the temperature measurement point 20 on the component, various methods can be used. Figure 1 and Figure 2 , illustratively, the temperature measuring point 20 is located on the outer shell surface of the component, and / or the outer shell recess. That is, the temperature measuring point 20 can be located on the outer shell of the component, and the specific temperature measuring point 20 can be located on the outer shell surface of the component, or can be located in the outer shell recess of the component. The temperature measuring point 20 can also be located inside the outer shell of the component, that is, the temperature measuring point 20 can be directly set inside the component. Of course, the temperature measuring point 20 can also be located at the connection between two components. It should be explained that the above-mentioned method of setting the temperature measuring point 20 on the component can be used alone, or some or all of them can be used simultaneously.

[0037] Exemplary, reference Figure 1 and Figure 2 When a conductive bar 50 is also provided in the working component, the conductive bar 50 may be, for example, but not limited to, a conductive copper bar or a conductive aluminum bar. The conductive bar 50 is used to realize the electrical connection of different devices. Exemplarily, the conductive bar 50 can be used to connect two components inside the power distribution module, and the conductive bar 50 can also be used to connect components inside the power distribution module and devices outside the power distribution module. The temperature measuring points 20 can be distributed on the conductive bar 50 to monitor the temperature of the conductive bar 50. That is, a conductive bar 50 is provided in the working component, and at least one temperature measuring point 20 is provided on the conductive bar 50. When setting the temperature measuring point 20 on the conductive bar 50, a variety of methods can be adopted.

[0038] Exemplary, reference Figure 1 and Figure 2 , the temperature measuring point 20 can be located on the surface of the conductive bar 50 and / or the recess of the conductive bar 50. In some embodiments, the temperature measuring point 20 can be located at the gap between two adjacent conductive bars 50. It should be explained that the two adjacent conductive bars 50 refer to two conductive bars 50 with a spacing less than a certain threshold, which can be two conductive bars 50 arranged side by side, for example, two conductive bars 50 arranged side by side at the connection between the conductive bar 50 and the terminal of the component. The gap between two adjacent conductive bars 50 refers to the space between the two adjacent conductive bars 50, and the temperature measuring point 20 can be set in the space to detect the temperature between the two adjacent conductive bars 50. In some embodiments, the temperature measuring point 20 can also be located at the connection between the two conductive bars 50. In some embodiments, the temperature measuring point 20 can also be located at the connection between the two conductive bars 50. In some embodiments, the temperature measuring point 20 can also be located at the connection between the conductive bars 50 and the components, wherein the components are located in the accommodating cavity 10 and are components in the working assembly. It should be explained that the connection of the conductive bar 50 refers to the electrical connection point formed between different conductive bars 50 and between the conductive bar 50 and the components by welding, plugging, clamping, etc. For example, the conductive bar 50 is connected to the connector 43 through a terminal, and the terminal is the connection between the conductive bar 50 and the component. The conductive bar 50 is welded together, and the welding point formed by welding is the connection of the conductive bar 50. In some embodiments, the temperature measuring point 20 can also be located between the conductive bar 50 and the insulating film, wherein the insulating film is used to wrap the outside of the conductive bar 50 to insulate the conductive bar 50 from the outside. At this time, the temperature measuring point 20 can be located between the conductive bar 50 and the insulating film wrapping the conductive bar 50 to detect the actual temperature of the surface of the conductive bar 50. It should be explained that the above-mentioned method of setting the temperature measuring point 20 on the conductive bar 50 can be used alone, or some or all of them can be used simultaneously.

[0039] Exemplary, reference Figure 1 , Figure 2 and Figure 3, the above-mentioned working assembly also includes: components, and a conductive bar 50 connected to the components, that is, the working assembly includes both components and a conductive bar 50 connected to the components. At this time, there is a first temperature zone at the connection between the components and the conductive bar 50, and at least one temperature measuring point 20 is set in the first temperature zone. It should be explained that the connection between the components and the conductive bar 50 refers to: an electrical connection point formed between the conductive bar 50 and the components by means such as welding, plugging, and terminal connection, and the temperature at this position is often higher than the temperature at other positions. Therefore, in this embodiment, a first temperature zone is set at the connection between the components and the conductive bar 50, and the first temperature zone is a high temperature zone in the power distribution module. At least one temperature measuring point 20 is set in the first temperature zone. The number of first temperature measuring points 20 set in the first temperature zone can be one, two or more, so as to monitor the temperature change of the first temperature zone in real time.

[0040] Exemplary, reference Figure 1 , Figure 2 and Figure 3 The working components may be composed of a fuse 42, a relay 41, a conductive bar 50, a connector 43, and a housing that serves as a fixed support. The fuse 42, the relay 41, and other components may be connected together through the conductive bar 50 to form a high-voltage connection circuit inside the power distribution module, and then connected to the peripheral connector 43 to connect to the outside. The connector 43 may be arranged on the wall plate of the box 11 distributed toward the outside of the battery pack on the power distribution box.

[0041] In addition, refer to Figure 1 and Figure 2, the power distribution module also includes an optical fiber 31, which is at least partially arranged on the working component. At least one grating is arranged in the optical fiber 31, and the grating is used to sense the temperature change at the temperature measuring point 20. The two ends of the optical fiber 31 are used to connect the optical signal emission source 32 and the demodulator 33. That is, by further arranging the optical fiber 31 in the power distribution module, part or all of the optical fiber 31 is arranged on the working component, and the gratings in the optical fiber 31 are respectively located at different positions of the temperature measuring points 20 to sense the temperature changes at the corresponding temperature measuring points 20. Exemplarily, one grating can be located at one temperature measuring point 20, or one grating can be located in the vicinity of one temperature measuring point 20, so as to be able to sense the temperature changes at the temperature measuring point 20. Exemplarily, each grating can be thermally bonded to the temperature measuring point 20, so that when the temperature of the temperature measuring point 20 changes, the grating pitch and refractive index of the grating of the optical fiber 31 can be caused to change. The two ends of the optical fiber 31 are used to connect the optical fiber 31 signal transmission source and the demodulator 33. When applied, the position of the working component with a high temperature can be determined based on the length of time the grating detects the optical signal, thereby improving the diffusion and flexibility of temperature monitoring of the power distribution module. Compared with related technologies, since the diameter of the optical fiber 31 is small, only a small space is required to complete the configuration, and the optical fiber 31 can be bent. When applied, the grating can be used to determine which specific position has a high temperature. For example, based on the length of time the grating detects the optical signal, it can be determined that the position of the working component has a high temperature, thereby improving the diffusion and flexibility of temperature monitoring of the power distribution module.

[0042] In some embodiments, reference Figure 1 and Figure 2, a fiber Bragg grating sensor can be provided, and the fiber Bragg grating sensor includes an optical fiber 31, an optical signal emission source 32 and a demodulator 33. Among them, the optical fiber 31 is at least partially located in the accommodating cavity 10, and specifically, the optical fiber 31 is at least partially arranged on the working component in the accommodating cavity 10. At least one grating is arranged in the optical fiber 31, and each grating is used to sense the temperature change at the temperature measuring point 20. Exemplarily, one grating can be located at one temperature measuring point 20, or one grating is located in the vicinity of one temperature measuring point 20, so as to be able to sense the temperature change at the temperature measuring point 20. Exemplarily, each grating can be thermally bonded to the temperature measuring point 20, so that when the temperature of the temperature measuring point 20 changes, the grating pitch and refractive index of the grating of the optical fiber 31 can be caused to change. Subsequently, the grating pitch and refractive index changes of the grating can be detected by the optical signal emission source 32 and the demodulator 33, so as to detect the temperature change of each temperature measuring point 20. Specifically, the optical signal emission source 32 is connected to the optical fiber 31, and the optical signal emission source 32 is used to send a first optical signal to the optical fiber 31. The demodulator 33 is connected to the optical fiber 31, and is used to receive the second optical signal reflected by the grating, and determine the temperature at the temperature measurement point 20 according to the second optical fiber 31 signal. That is, the first optical signal emitted by the optical signal emission source 32 to the optical fiber 31 will be reflected by the grating to form a second optical signal, and the temperature at the temperature measurement point 20 where each grating is located is obtained according to the change of the second optical signal relative to the first optical signal.

[0043] It should be explained that the grating is an optical device composed of a large number of parallel slits with regularly changing spacings, among which the most common is an equidistant grating with the same spacing width of the parallel slits. The above-mentioned large number of parallel slits with regularly changing spacings are written on the core of the optical fiber 31 using the photosensitivity of the optical fiber 31 material to form the grating of the optical fiber 31. The flexible use of the grating of the optical fiber 31 is that multi-point sensing can be realized. In theory, countless gratings of optical fibers 31 with different wavelengths can be written in one optical fiber 31 to realize distributed monitoring of the same or multiple physical parameters. The optical fiber 31 with multiple optical fiber 31 gratings is called an optical fiber 31 grating string. By accurately matching the distance between the two reflection points, the light wave signal that meets the conditions is reflected by the grating, while other wavelength signals are basically not reflected. By connecting the demodulator 33 of the optical fiber 31 grating, the wavelength of the light wave of the independent emission wave can be measured. Once the grating of the optical fiber 31 is affected by changes in temperature or stress field, the grating pitch of the grating will change, the wavelength of the reflected wave will also change accordingly, and different wavelengths will be emitted, so that the wavelength of the light wave can be measured.

[0044] When setting the optical fiber 31, refer to Figure 1 and Figure 2, the number of optical fibers 31 is at least one, and specifically, the number of optical fibers 31 can be any number such as one, two, or three. Exemplarily, at least one grating is provided on each optical fiber 31, that is, each optical fiber 31 is provided with a grating, so that the temperature of at least one temperature measuring point 20 on the working component can be detected through each optical fiber 31. And each optical fiber 31 is connected to an optical signal emission source 32 and a demodulator 33. When specifically connected, one end of each optical fiber 31 can be connected to the optical signal emission source 32, and the other end can be connected to the demodulator 33, so that a first optical signal can be input into the optical fiber 31 from one end of the optical fiber 31, and a second optical signal can be transmitted from the other end of the optical fiber 31.

[0045] Exemplarily, at least three gratings are provided in each optical fiber 31, and the at least three gratings can be arranged at equal intervals along the extension direction of the optical fiber 31. Of course, in other embodiments, the multiple gratings in the optical fiber 31 are not limited to being arranged at equal intervals along the extension direction of the optical fiber 31. For example, the number of gratings can also be determined according to the temperature variation range of the selected temperature measuring point 20. At a position where the temperature variation range of the temperature measuring point 20 is larger, a larger number of temperature measuring points 20 can be set, so that the arrangement density of the gratings at this position is larger. At a position where the temperature variation range of the temperature measuring point 20 is smaller, a smaller number of temperature measuring points 20 can be set, so that the arrangement density of the gratings at this position is smaller.

[0046] Of course, in other embodiments, the arrangement density of the temperature measuring points 20 and the gratings can be determined according to the temperature range of different regions. In the thermal simulation temperature field cloud map of the power distribution module, the components such as the fuse 42, relay 41, conductive bar 50, connector 43 of the power distribution module are generally high temperature areas, and the temperature of other areas is lower than that of the high temperature areas. Several gratings can be engraved in advance on an optical fiber 31 with a diameter of one hundred to several hundred microns. These gratings can be independently used for temperature monitoring. The two ends of the optical fiber 31 are connected to the host, and the host includes an optical signal transmitting source 32 and a demodulator 33. Specifically, the two ends of the optical fiber 31 are connected to the optical signal transmitting source 32 and the demodulator 33. The grating can convert the optical signal into a temperature signal. It only needs to select the required temperature measuring point 20 in advance inside the power distribution module, and arrange the fiber 31 line position and the grating engraving point position at the same time, so as to monitor the temperature field of each temperature measuring point 20. More temperature measuring points 20 can be arranged in the high temperature area, so that this high temperature area can be characterized as much as possible. Of course, in other embodiments, more temperature measuring points 20 may be arranged at places where the temperature changes dramatically, so as to facilitate subsequent temperature field calculation and monitoring.

[0047] Exemplary, reference Figure 1 and Figure 2, the above-mentioned working assembly also includes: components, and a conductive bar 50 connected to the components, that is, the working assembly includes both components and a conductive bar 50 connected to the components. At this time, there is a first temperature zone at the connection between the components and the conductive bar 50, and at least one temperature measuring point 20 is set in the first temperature zone. It should be explained that the connection between the components and the conductive bar 50 refers to: an electrical connection point formed between the conductive bar 50 and the components by means such as welding, plugging, and terminal connection. For example, the conductive bar 50 is connected to the connector 43 through a terminal, and the terminal is the connection between the conductive bar 50 and the components. The temperature at this position is often higher than the temperature at other positions. Therefore, in this embodiment, a first temperature zone is set at the connection between the components and the conductive bar 50, and the first temperature zone is a high temperature zone in the power distribution module. At least one temperature measuring point 20 is set in the first temperature zone. The number of first temperature measuring points 20 set in the first temperature zone can be one, two or more, so as to monitor the temperature change of the first temperature zone in real time. The locations that need to be monitored in the power distribution module are mainly the high-temperature areas of components and electrical connection points. The temperatures of these points must be collected to detect safety.

[0048] For example, each temperature measuring point 20 can be fitted with the grating of the optical fiber 31, and heat can be exchanged between the grating and the temperature measuring point 20, and the heat exchange method can be such as but not limited to heat conduction, heat radiation or heat convection. The data of the temperature measuring point 20 and the grating are related to the number of fuses 42, the number of relays 41, the length of the conductive bar 50, the number of connectors 43, the number of connection points between two components, etc. For example, the substantially same temperature area can be divided into several equal sections, and then the temperature measuring points 20 and the grating are arranged in an equidistant manner.

[0049] When each grating is set at the corresponding temperature measuring point 20, each grating can be fixed at the temperature measuring point 20 by means such as but not limited to gluing or clamping. Of course, in other embodiments, the optical fiber 31 can also be pre-buried, that is, the optical fiber 31 is pre-buried in the wall panel of the box 11 of the power distribution module, the housing of the components, the gap between the conductive bar 50 and the insulating film, and other structures.

[0050] Exemplarily, there are many ways to bond each grating to the above-mentioned components and conductive bar 50, including but not limited to bonding with glue resistant to high and low temperatures, or bonding with the outer shell of the component by physical suspension integration, etc. Exemplarily, thermal insulation translucent glue can be used for bonding, or the PI film (polyimide film) can be pre-buried inside in advance. Since the optical fiber 31 is very thin and the size of the optical fiber 31 is much smaller than the gap of the distribution module, there is no need to open a groove for the optical fiber 31 separately, and it has good geometric extensibility. Since hundreds of gratings can be engraved on an optical fiber 31, a single optical fiber 31 can be used to monitor multiple working components in the distribution module, or even all working components of the entire distribution module. In this way, the temperature field of the entire distribution module is obtained through later demodulation, which is used to continue the heat dissipation of the distribution module and the formulation of the heat dissipation control strategy.

[0051] Exemplary, reference Figure 2 , the optical signal transmitting source 32 and the demodulator 33 can be arranged in the accommodating cavity 10, thereby reducing the distance between the optical signal transmitting source 32 and the demodulator 33 and the grating. At this time, each optical fiber 31 is completely located in the accommodating cavity 10, so that the optical fiber 31 is conveniently connected to the optical signal transmitting source 32 and the demodulator 33. Of course, in other embodiments, reference Figure 1 , the optical signal transmission source 32 and the demodulator 33 can be arranged outside the accommodating cavity 10. In this case, each optical fiber 31 is partially located inside the accommodating cavity 10 and partially located outside the accommodating cavity 10. The portion located outside the accommodating cavity 10 is used to connect the optical fiber 31 signal transmission source and the demodulator 33 with the portion located inside the accommodating cavity 10. In some embodiments, when the optical signal transmission source 32 and the demodulator 33 are arranged outside the accommodating cavity 10, the optical signal transmission source 32 and the demodulator 33 can be arranged at other locations of the vehicle. For example, refer to Figure 3 , the battery energy distributor 61 (BDU) in the battery pack can coexist independently with the battery management system 62 (BMS), that is, the battery energy distributor 61 and the battery management system 62 can be distributed in different positions of the battery pack. Exemplarily, the battery energy distributor 61 can be set in the accommodating cavity 10 of the distribution box, and the battery management system 62 can be set outside the distribution box. Exemplarily, when the battery energy distributor 61 is provided in the distribution module, the optical signal transmitting source 32 and the demodulator 33 can be set inside the battery energy distributor 61. Exemplarily, the optical signal transmitting source 32 and the demodulator 33 can also be set inside the battery management system 62. Exemplarily, the optical signal transmitting source 32 and the demodulator 33 can also be set and integrated with the battery management system 62 on the same relatively large circuit board.

[0052] In the related technologies, there are relatively few models that collect temperature field data of the distribution module as a battery management strategy. The related technologies mainly use NTC components (thermistors) that are consistent with the temperature sampling of the battery cells. The disadvantages of this type of NTC component are as follows: (1) The temperature sampling accuracy is about ±1°C, which is low; (2) The thermal capacity of the NTC component itself is relatively large, and the delay is relatively long when the temperature changes; (3) The volume is relatively large and occupies a large space, so sampling may not be possible in some places with small spaces; (4) When there are many sampling points, the space and cost increase a lot, resulting in the possibility that the final solution may not be implemented; (5) Since there are few sampling temperature points and the control program is generally not updated after being controlled, the distribution of the internal impedance of the distribution module may change dynamically, resulting in changes in the highest temperature point and the temperature field distribution. At this time, the sampling point and its control program cannot automatically adapt, resulting in sampling and control deviations, which seriously lead to safety problems.

[0053] In the various embodiments shown above, the present application provides an optical fiber 31 on the working component, and at least one grating is provided in the optical fiber 31. The grating is used to sense the temperature change at the temperature measuring point 20 on the working component, so as to measure the temperature of the working component. Since the diameter of the optical fiber 31 is small, only a small space is required to complete the configuration, and the optical fiber 31 can be bent. When used, the grating can be used to determine which specific position has a high temperature. For example, based on the length of time the grating detects the light signal, it can be determined that the position of the working component has a high temperature, thereby improving the diffusion and flexibility of temperature monitoring of the power distribution module.

[0054] Compared with the related art, the present application has the following advantages in some embodiments: 1. In some embodiments, the present application does not need to use glue to fix the optical fiber 31 and the grating, which avoids the extra time of baking and waiting for curing caused by the use of glue. 2. In some embodiments, since the size of the optical fiber 31 is very small, the present application does not need to use a slot or a buckle structure to fix the optical fiber 31 and the grating, and can be fixed with Pi film (polyimide film) tape, and the product design structure is simpler and more economical. 3. Based on the temperature measurement method shown in the present application, the abnormality of the temperature data collected at different temperature measurement points 20 can be identified, and the model and historical data are formed through AI learning. When the temperature sampling data of a certain temperature measurement point 20 itself is abnormal, it can be identified at the first time. 4. The present application does not need to add a temperature sampling channel on the BMS (battery management system 62) mainboard to collect the temperature of more temperature measurement points 20, and the complexity and cost of the BMS system are reduced. 5. The present application can monitor the temperature changes of a large number of temperature measurement points 20 at the required positions by increasing the number of gratings set in the optical fiber 31. 6. The present application measures temperature through optical fiber 31 grating, which has high precision and will not be affected by electromagnetic interference and produce temperature drift. 7. The present application measures temperature through optical fiber 31 grating. Due to its small size, it has great flexibility and can be arranged at any position. 8. The present application measures temperature through optical fiber 31 grating. In some embodiments, one or more optical fibers 31 can be arranged at each working component of the power distribution module. Each optical fiber 31 is engraved with multiple gratings, and then led out from the side of the power distribution module together. The optical fiber 31 can also be integrated into the battery management system 62. 9. Due to the large amount of data, the present application can use the data of a large number of temperature measurement points 20 produced in the later stage to optimize the heat dissipation strategy for large-current fast charging or discharging of power distribution, and even conduct AI training to obtain the most appropriate heat dissipation management strategy.

[0055] In addition, the present application also provides a battery pack, referring to Figure 1 to Figure 3 , the battery pack includes: any one of the above-mentioned power distribution modules.

[0056] Furthermore, the present application embodiment also provides a power system, referring to Figure 1 to Figure 3 , the power system includes any of the above-mentioned battery packs. Exemplarily, the power system may include a vehicle or an energy storage system. Among them, in terms of power type, the vehicle may be a vehicle such as but not limited to an electric vehicle, a hybrid vehicle, etc. In terms of vehicle function, the vehicle may be a vehicle such as but not limited to a passenger car, an engineering vehicle, etc. having a battery pack and a power distribution module. The energy storage system may be a power station such as a power station, a battery swap station, etc.

[0057] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A power distribution module, characterized in that: include: A working component, wherein at least one temperature measuring point is arranged on the working component; an optical fiber, the optical fiber being at least partially disposed on the working component; At least one grating is arranged in the optical fiber, and the grating is used to sense the temperature change at the temperature measurement point; the two ends of the optical fiber are respectively used to connect the optical signal emission source and the demodulator.

2. The power distribution module according to claim 1, characterized in that: The working components include: A component is provided with at least one temperature measuring point.

3. The power distribution module according to claim 2, characterized in that: The components include at least one of a relay, a contactor, a fuse, and a connector.

4. The power distribution module according to claim 2, characterized in that: The temperature measuring point is located on the shell surface of the component and / or the shell recess; or / and, The temperature measuring point is located inside the housing of the component; or / and, The temperature measuring point is located at the connection between two components.

5. The power distribution module according to claim 1, characterized in that: The working components include: A conductive bar, wherein at least one temperature measuring point is arranged on the conductive bar.

6. The power distribution module according to claim 5, characterized in that: The temperature measuring point is located on the surface and / or recess of the conductive bar; or / and, The temperature measurement point is located at the gap between two adjacent conductive bars; or / and, The temperature measuring point is located at the connection between the two conductive bars; or / and, The temperature measuring point is located at the connection between the conductive bar and the component, wherein the component is located in the accommodating cavity where the conductive bar is located; or / and, The temperature measuring point is located between the conductive bar and the insulating film, wherein the insulating film is wrapped around the outside of the conductive bar.

7. The power distribution module according to claim 1, characterized in that: The working assembly includes: components and conductive bars connected to the components; Wherein, the connection between the component and the conductive bar has a first temperature zone, and the first temperature zone is provided with at least one temperature measuring point.

8. The power distribution module according to claim 1, characterized in that: The number of the optical fibers is at least one, and each of the optical fibers is provided with at least one grating.

9. The power distribution module according to claim 1, characterized in that: At least three gratings are arranged in the optical fiber, and the at least three gratings are arranged at equal intervals along the extension direction of the optical fiber.

10. The power distribution module according to claim 1, characterized in that: The grating is fixed at the temperature measuring point by gluing or locking.

11. A battery pack, characterized in that: include: A power distribution module as claimed in any one of claims 1 to 10.

12. An electricity system, characterized in that: include: The battery pack as claimed in claim 11.

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