Internal temperature measurement battery

Abstract

The utility model relates to the technical field of batteries, in particular to an internal temperature measurement battery, which comprises a plurality of positive plates, a plurality of negative plates, a plurality of diaphragms, an optical splitter and more than one light reflection unit. And the optical splitter is arranged in the inner temperature measuring battery. And at least one diaphragm is provided with a light reflection unit. And each light reflection unit is connected with the optical splitter through an optical transmission line. And the more than one light reflection unit and the optical splitter form a temperature measurement assembly for measuring the temperature of the electrolyte in the internal temperature measurement battery in the internal temperature measurement battery. The optical splitter can emit laser waves, when the laser waves pass through the light reflection unit, the light reflection unit can reflect the laser waves with the corresponding wavelengths according to the temperature of the environment where the light reflection unit is located, the laser waves are compared with the laser waves emitted by the distributed Bragg reflection laser, and the temperature of the environment where the light reflection unit is located can be known according to the drift distance of the reflection wavelength. Therefore, in-situ measurement of the internal temperature of the battery can be quickly realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an internal temperature measurement battery. Background Art

[0002] At present, when batteries are used, more attention is paid to their external electrical performance, but the thermal performance is neglected to a certain extent. The thermal performance inside the battery is related to the overall performance and safety performance of the battery. Usually, a temperature sensor for detecting the internal temperature of the battery cannot be directly installed inside the battery, otherwise there is a risk of short circuit between the positive and negative electrodes. Therefore, the thermal performance of the battery can only be evaluated by detecting the temperature outside the battery. However, it takes a certain amount of time for heat energy to be transferred from the inside of the battery to the outside of the battery, and it is impossible to quickly obtain the temperature changes inside the battery. Therefore, how to achieve in-situ measurement of the internal temperature of the battery has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0003] The utility model provides an internal temperature measurement battery, which is used to solve the problem that the in-situ measurement of the internal temperature of the battery cannot be achieved.

[0004] The utility model provides an internal temperature measurement battery, comprising:

[0005] There are multiple positive electrode sheets, all of which are arranged inside the internal temperature measurement battery;

[0006] There are multiple negative electrode sheets, all of which are arranged inside the internal temperature measurement battery and are arranged alternately with multiple positive electrode sheets; a diaphragm is arranged between each adjacent negative electrode sheet and positive electrode sheet;

[0007] An optical splitter is installed inside the internal temperature measurement battery;

[0008] There are more than one light reflecting unit; at least one light reflecting unit is installed on at least one diaphragm; each light reflecting unit is connected to the optical splitter through an optical transmission line; more than one light reflecting unit and the optical splitter constitute a temperature measuring component for measuring the internal temperature of the internal temperature measuring battery inside the internal temperature measuring battery.

[0009] In some embodiments, a plurality of positive electrode sheets are formed with positive electrode tabs on top; a plurality of negative electrode sheets are formed with negative electrode tabs on top;

[0010] Each light reflection unit includes a plurality of light reflection sub-units; the plurality of light reflection sub-units are sequentially connected in series through an optical transmission line and connected to an optical splitter;

[0011] At least one light reflecting subunit is mounted on the upper portion of the diaphragm and is located below the negative electrode ear;

[0012] and / or, at least one light reflecting subunit is mounted on the upper portion of the same diaphragm and is located below the positive electrode tab;

[0013] and / or, at least one light reflecting subunit is mounted in the middle of the same diaphragm;

[0014] and / or, at least one light reflecting subunit is mounted on the lower part of the same diaphragm and is located below the negative electrode lug;

[0015] And / or, at least one light reflecting subunit is installed at the lower part of the same diaphragm and is located below the positive electrode tab.

[0016] In some of the embodiments, each light reflecting subunit is pre-embedded in the diaphragm or fixed on the surface of the diaphragm;

[0017] And / or, at least one diaphragm is mounted with more than one support block.

[0018] In some embodiments, the distance between the center of the light reflecting subunit installed on the upper part of the diaphragm and located below the negative electrode ear and the center of the negative electrode ear is 5 mm-20 mm;

[0019] The distance between the center of the light reflecting subunit installed on the upper part of the diaphragm and located below the positive electrode tab and the center of the positive electrode tab is 5 mm to 20 mm.

[0020] In some of the embodiments, each light reflecting sub-unit includes a plurality of fiber Bragg grating sensors that are sequentially spaced apart.

[0021] In some of these embodiments, the optical transmission line is a single-mode optical fiber.

[0022] In some of the embodiments, a plurality of conical holes are provided on the single-mode optical fiber along the extension direction of the single-mode optical fiber; the centers of the cone bottoms of the plurality of conical holes are located on the same busbar of the single-mode optical fiber.

[0023] In some of these embodiments, a cover plate is provided on the top of the internal temperature measuring battery;

[0024] Also includes:

[0025] The accommodating box is installed on the bottom surface of the cover plate and is used to accommodate the optical splitter inside.

[0026] In some embodiments, the housing box includes:

[0027] The top surface of the upper shell is fixedly connected to the bottom surface of the cover plate;

[0028] The lower shell is detachably connected to the upper shell.

[0029] In some of the embodiments, a liquid injection hole and / or a pressure relief hole is provided on the cover plate;

[0030] Also includes:

[0031] The positive electrode column is mounted on the cover plate;

[0032] and / or, a negative electrode column mounted on the cover plate;

[0033] and / or, explosion-proof valve, installed in the pressure relief hole;

[0034] And / or, a pressing plate is installed on the top surfaces of the plurality of positive electrode sheets and the plurality of negative electrode sheets.

[0035] The beneficial effects of the utility model are as follows: the internal temperature measurement battery of the utility model is provided with an optical splitter, which can emit laser light waves. When the laser light waves pass through the light reflection unit, the light reflection unit will reflect the laser light waves of the corresponding wavelength according to the ambient temperature, and compare with the laser light waves emitted by the distributed Bragg reflection laser. The ambient temperature of the light reflection unit can be known according to the drift of the reflected wavelength. In this way, the internal temperature of the battery can be quickly measured in situ. At the same time, there is no risk of short circuit between the positive and negative electrodes, which will not only not increase the polarization degree of the electrochemical reaction, but also will not increase the risk of local lithium precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of some specific embodiments of an internal temperature measurement battery of the utility model;

[0037] Figure 2 yes Figure 1 The schematic diagram of the structure of the housing box and the optical splitter in the internal temperature measurement battery shown;

[0038] Figure 3 yes Figure 1 Schematic diagram of the structure of the optical transmission line in the internal temperature measurement battery shown.

[0039] In the accompanying drawings, 110, positive electrode sheet; 111, positive electrode ear; 120, negative electrode sheet; 121, negative electrode ear; 130, diaphragm; 140, optical splitter; 150, optical reflection unit; 151, optical reflection sub-unit; 160, optical transmission line; 170, accommodating box; 171, upper shell; 172, lower shell; 181, cover plate; 1811, liquid injection hole; 182, positive electrode column; 183, negative electrode column; 184, explosion-proof valve; 185, pressure plate. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] Single-mode optical fiber: optical fiber with only one transmission mode and a glass core diameter of 9μm or 10μm.

[0042] Wavelength drift: refers to the change in frequency or wavelength of light waves during propagation.

[0043] Fiber Bragg grating sensor: A fiber optic sensor with the highest frequency and widest range. This sensor can change the wavelength of the light wave it reflects according to the changes in ambient temperature parameters, pressure parameters, and strain parameters. The fiber Bragg grating sensor has a high response speed, and the reflected wavelength drift has a good linear relationship with temperature and is independent of the direction of temperature change. The fiber Bragg grating sensor can act as a reflector of a specific wavelength, and the wavelength of the light wave it reflects is expressed as λ B =2n eff Λ; where λ B is the Bragg wavelength, n eff is the effective refractive index of the grating, and Λ is the Bragg grating period. In practical applications, the reflection peak Δλ can be monitored B The wavelength shift is determined by n eff and Λ, both of which depend on changes in temperature, pressure and strain in the environment of the fiber Bragg grating sensor. When the Bragg reflection wavelength shifts, it is affected by temperature. The measurement of this wavelength shift is the basis of fiber Bragg grating sensors; for changes in temperature, changes in the Bragg wavelength can be observed, which is mainly attributed to the temperature-related changes in the refractive index, while the effect of thermal expansion is very small and the grating spacing can be ignored.

[0044] At present, batteries can be divided into solid-state batteries, liquid batteries, semi-solid-state batteries and gel-state batteries according to the form of internal electrolytes. For solid-state batteries, multiple positive and negative electrode sheets are provided inside, and multiple negative electrode sheets are arranged alternately with multiple positive electrode sheets. A solid electrolyte is arranged between each adjacent negative electrode sheet and a positive electrode sheet. For liquid batteries, it is more common that multiple positive and negative electrode sheets are provided inside, and multiple negative electrode sheets are arranged alternately with multiple positive electrode sheets. A liquid electrolyte and a diaphragm are arranged between each adjacent negative electrode sheet and a positive electrode sheet. For semi-solid-state batteries, multiple positive and negative electrode sheets are provided inside, and multiple negative electrode sheets are arranged alternately with multiple positive electrode sheets. A solid electrolyte, a diaphragm and a liquid electrolyte are arranged between each adjacent negative electrode sheet and a positive electrode sheet. For gel-state batteries, multiple positive and negative electrode sheets are provided inside, and multiple negative electrode sheets are arranged alternately with multiple positive electrode sheets. A gel electrolyte is arranged between each adjacent negative electrode sheet and a positive electrode sheet.

[0045] As described in the background art, how to achieve in-situ measurement of the internal temperature of a battery has become a technical problem that needs to be solved urgently by those skilled in the art.

[0046] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3 The utility model provides an internal temperature measuring battery, comprising a plurality of positive electrode sheets 110, a plurality of negative electrode sheets 120, a plurality of diaphragms 130, an optical splitter 140 and one or more light reflecting units 150. The plurality of positive electrode sheets 110 are all arranged inside the shell of the internal temperature measuring battery. The plurality of negative electrode sheets 120 are all arranged inside the shell of the internal temperature measuring battery, and are arranged alternately with the plurality of positive electrode sheets 110. A diaphragm 130 and an electrolyte are arranged between each adjacent negative electrode sheet 120 and a positive electrode sheet 110. The optical splitter 140 is installed inside the internal temperature measuring battery. A light reflecting unit 150 is installed on at least one diaphragm 130. Each light reflecting unit 150 is connected to the optical splitter 140 via an optical transmission line 160. One or more light reflecting units 150 and the optical splitter 140 constitute a temperature measuring component for measuring the internal electrolyte temperature of the internal temperature measuring battery inside the internal temperature measuring battery.

[0047] It should be pointed out that the optical splitter 140 mainly includes a distributed Bragg reflection laser and a photoelectric demodulator. The distributed Bragg reflection laser can emit laser light waves. When the laser light waves pass through the light reflection unit 150, the light reflection unit 150 will reflect the laser light waves of the corresponding wavelength according to the ambient temperature, and compare it with the laser light waves emitted by the distributed Bragg reflection laser. The ambient temperature of the light reflection unit 150 can be known according to the drift of the reflected wavelength. In this way, the in-situ measurement of the internal temperature of the battery can be quickly achieved. At the same time, there is no risk of short circuit between the positive and negative electrodes 120, which will not only not increase the polarization degree of the electrochemical reaction, but also will not increase the risk of local lithium precipitation.

[0048] It should be noted that each positive electrode sheet 110 and each negative electrode sheet 120 is not limited to a lithium sheet.

[0049] In some of the embodiments, a light reflection unit 150 is installed on one of the isolation films of the internal temperature measurement battery, so as to quickly realize a single set of in-situ measurement of the internal temperature of the battery.

[0050] In other embodiments, a light reflection unit 150 is respectively installed on two or more isolation films of the internal temperature measurement battery, so that multiple groups of in-situ measurements of the internal temperature of the battery can be quickly achieved.

[0051] It is understandable that, for liquid batteries and semi-solid batteries, a diaphragm 130 is provided inside, and the light reflection unit 150 can be installed on the diaphragm 130. For solid batteries and gel batteries, the light reflection unit 150 can be directly embedded in the solid electrolyte or the gel electrolyte to measure the internal temperature of the battery.

[0052] Specifically, in the exemplary embodiment, in the shell of the internal temperature measurement battery, a plurality of positive electrode sheets 110 are formed with positive electrode ears 111 on the top, and a plurality of negative electrode sheets 120 are formed with negative electrode ears 121 on the top. Each light reflection unit 150 includes a plurality of light reflection subunits 151, and the plurality of light reflection subunits 151 are sequentially connected in series through the optical transmission line 160 and connected to the optical splitter 140. The plurality of light reflection subunits 151 can perform in-situ measurement of the temperature of multiple regions inside the battery. At least one light reflection subunit 151 is installed on the upper part of the diaphragm 130 and is located below the negative electrode ear 121, and can perform in-situ measurement of the temperature of the region near the negative electrode ear 121. And / or, at least one light reflection subunit 151 is installed on the upper part of the same diaphragm 130 and is located below the positive electrode ear 111, and can perform in-situ measurement of the temperature of the region near the positive electrode ear 111. And / or, at least one light reflecting subunit 151 is installed in the middle of the same diaphragm 130, and the temperature of the middle area of ​​the positive and negative electrode sheets 120 can be measured in situ. And / or, at least one light reflecting subunit 151 is installed in the lower part of the same diaphragm 130, and is located below the negative electrode ear 121, and the temperature of the lower area of ​​the positive and negative electrode sheets 120 can be measured in situ. And / or, at least one light reflecting subunit 151 is installed in the lower part of the same diaphragm 130, and is located below the positive electrode ear 111, and the temperature of the lower area of ​​the positive and negative electrode sheets 120 can be measured in situ.

[0053] For the entire battery interior, the area near the positive electrode ear 111 and the negative electrode ear 121 has a relatively high temperature and should be used as an important area for temperature detection.

[0054] In some of the application scenarios, each light reflecting unit 150 includes three light reflecting subunits 151, which are connected in series in sequence through the optical transmission line 160 and connected to the optical splitter 140. One of the light reflecting subunits 151 is installed on the upper part of the diaphragm 130 and is located below the negative pole ear 121, and can perform in-situ measurement of the temperature of the area near the negative pole ear 121. Another light reflecting subunit 151 is installed in the middle of the same diaphragm 130, and can perform in-situ measurement of the temperature of the middle area of ​​the positive and negative electrode sheets 120. Another light reflecting subunit 151 is installed on the upper part of the same diaphragm 130 and is located below the positive pole ear 111, and can perform in-situ measurement of the temperature of the area near the positive pole ear 111.

[0055] In other application scenarios, each light reflecting unit 150 includes five light reflecting subunits 151, and the five light reflecting subunits 151 are connected in series in sequence through the optical transmission line 160 and connected to the optical splitter 140. One light reflecting subunit 151 is installed on the upper part of the diaphragm 130 and is located below the negative ear 121, and can perform in-situ measurement of the temperature of the area near the negative ear 121. One light reflecting subunit 151 is installed on the upper part of the same diaphragm 130 and is located below the positive ear 111, and can perform in-situ measurement of the temperature of the area near the positive ear 111. One light reflecting subunit 151 is installed in the middle part of the same diaphragm 130, and can perform in-situ measurement of the temperature of the middle area of ​​the positive and negative electrode sheets 120. One light reflecting subunit 151 is installed on the lower part of the same diaphragm 130 and is located below the negative ear 121, and can perform in-situ measurement of the temperature of the lower area of ​​the positive and negative electrode sheets 120. A light reflection subunit 151 is installed at the lower part of the same diaphragm 130 and is located below the positive electrode tab 111 , so as to be able to perform in-situ measurement of the temperature of the lower area of ​​the positive and negative electrode sheets 120 .

[0056] Preferably, the connection end between each light reflecting subunit 151 and the optical transmission line 160 is made of polytetrafluoroethylene material. Polytetrafluoroethylene material has excellent electrical insulation, corrosion resistance, chemical stability and good anti-aging performance, so that the temperature measuring component has a longer service life.

[0057] Specifically, in the exemplary embodiment, each light reflecting subunit 151 is pre-buried in the diaphragm 130 or fixed on the surface of the diaphragm 130. And / or, at least one diaphragm 130 is mounted with one or more supporting blocks.

[0058] In some of the application scenarios, each light reflecting subunit 151 is pre-buried in the diaphragm 130, which effectively improves the utilization rate of the internal space of the internal temperature measurement battery.

[0059] In some other application scenarios, each light reflecting sub-unit 151 is fixed to the surface of the diaphragm 130 to facilitate assembly and disassembly of the light reflecting sub-unit 151 .

[0060] When each light reflecting unit 150 includes three light reflecting sub-units 151, and the three light reflecting sub-units 151 are respectively installed on the upper and middle parts of the same diaphragm 130, one or more supporting blocks are installed on the lower part of the diaphragm 130 to ensure that the positive and negative electrode sheets 120 are evenly stressed from top to bottom.

[0061] Preferably, each support block is made of non-polar rubber with excellent insulation performance, and there should be no harmful irregularities on the upper and lower surfaces. Harmful irregularities refer to one of the following characteristics: defects that destroy uniformity and damage the smooth contour of the surface, such as small holes, cracks, local ridges, cuts, inclusions of conductive foreign matter, folds, gaps, concave and convex ripples, and casting marks. The support block keeps the spacing between adjacent positive and negative plates 110 and 120 consistent from top to bottom. Its size should be as small as possible to avoid affecting the normal use of the internal temperature measurement battery.

[0062] In order to improve the accuracy of temperature detection, the distance between the center of the light reflecting subunit 151 installed on the upper part of the diaphragm 130 and located below the negative electrode ear 121 and the center of the negative electrode ear 121 is 5mm-20mm. The distance between the center of the light reflecting subunit 151 installed on the upper part of the diaphragm 130 and located below the positive electrode ear 111 and the center of the positive electrode ear 111 is also 5mm-20mm.

[0063] Specifically, in the exemplary embodiment, each light reflecting subunit 151 includes 3, 4 or 5 fiber Bragg grating sensors arranged in sequence. The reserved spacing between each two adjacent fiber Bragg grating sensors should not be less than the length of a single fiber Bragg grating sensor. The fiber Bragg grating sensor sets a grating along the length direction of the single-mode optical fiber to control the behavior of light. The fiber Bragg grating is irradiated with ultraviolet light to produce permanent changes and then embedded in the core of the optical fiber. These Bragg gratings act as wavelength selective mirrors. When the spectrum propagates through the core, specific wavelengths are reflected back, while the rest of the spectrum is hardly affected.

[0064] Specifically, in the exemplary embodiment, the optical transmission line 160 is a single-mode optical fiber, which has low transmission loss and low transmission dispersion. Since the single-mode optical fiber has low transmission loss, the light wave can be transmitted farther in the optical fiber. Since the single-mode optical fiber has low transmission dispersion, the single-mode optical fiber can transmit large-capacity data at high speed.

[0065] Preferably, a plurality of conical holes are provided on the single-mode optical fiber along the extension direction of the single-mode optical fiber. The axis of each conical hole intersects perpendicularly with the central axis of the single-mode optical fiber, the centers of the cone bottoms of the plurality of conical holes are located on the same busbar of the single-mode optical fiber, the cone bottom diameter of each conical hole is preferably 5μm-15μm, and the center spacing between the cone bottoms of two adjacent conical holes is 0.5mm-1mm. When the single-mode optical fiber is bent, the busbar where the centers of the cone bottoms of the plurality of conical holes are located is located on the outside of the bent single-mode optical fiber. By providing the conical holes, the single-mode optical fiber has a bending-sensitive characteristic, so that the single-mode optical fiber can be bent easily, and then multiple light reflecting sub-units 151 can be connected in series.

[0066] Specifically, in the exemplary embodiment, a cover plate 181 is provided on the top of the internal temperature measuring battery. The internal temperature measuring battery also includes a containing box 170, which is mounted on the bottom surface of the cover plate 181 and is used to accommodate the optical splitter 140 inside. The containing box 170 can isolate the optical splitter 140 from the inside of the internal temperature measuring battery, and prevent the optical splitter 140 from being contaminated by dust or moisture, thereby avoiding damage to the optical splitter 140 and extending the service life of the optical splitter 140. The containing box 170 includes an upper shell 171 and a lower shell 172. The top surface of the upper shell 171 is fixedly connected to the bottom surface of the cover plate 181. The lower shell 172 is detachably connected to the upper shell 171 to facilitate the disassembly, replacement and assembly of the containing box 170.

[0067] Preferably, the material of the accommodating box 170 is aluminum alloy, which has relatively low cost, good heat dissipation capability and processing performance, and has a certain hardness.

[0068] Preferably, a processing chip is also installed inside the accommodating box 170 , and the processing chip is electrically connected to the optical splitter 140 .

[0069] Preferably, the optical splitter 140 is glued to the inner bottom surface of the accommodating box 170 or fixed to the accommodating box 170 by bolts or received in an accommodating groove in the accommodating box 170 that matches the optical splitter 140 to ensure the stability of the position of the optical splitter 140.

[0070] Preferably, the lower shell 172 and the upper shell 171 are detachably connected by a snap connection, a lock connection, or a plug-in connection.

[0071] Preferably, the upper shell 171 is glued to the bottom surface of the cover plate 181 or fixed to the bottom surface of the cover plate 181 by bolts to ensure the stability of the position of the accommodating box 170. At the same time, glue can be applied to the surrounding joints to ensure the sealing of the accommodating box 170 and prevent the accommodating box 170 from being corroded.

[0072] Specifically, in the exemplary embodiment, a liquid injection hole 1811 for injecting liquid electrolyte into the internal temperature measuring battery and / or a pressure relief hole for relieving pressure when the internal temperature measuring battery fails are provided on the cover plate 181. The internal temperature measuring battery also includes a positive pole 182 mounted on the cover plate 181. And / or, a negative pole 183 mounted on the cover plate 181. And / or, an explosion-proof valve 184 mounted in the pressure relief hole. And / or, a pressure plate 185 mounted on the top surface of a plurality of positive plates 110 and a plurality of negative plates 120.

[0073] The working principle of the internal temperature measurement battery is as follows:

[0074] The optical splitter 140 transmits light waves to the single-mode optical fiber through one port. At the other port, a fiber Bragg grating demodulation module is used to detect the wavelength and wavelength drift of the light waves reflected by each fiber Bragg grating sensor connected in series on the single-mode optical fiber. Based on the detected wavelength and wavelength drift, the temperature at the location of each fiber Bragg grating sensor is automatically calculated. By monitoring the Bragg wavelength drift of the fiber Bragg grating sensor connected to the single-mode optical fiber, the temperature changes at different positions inside the battery can be obtained, and the detected data have a high response speed and a relatively high detection accuracy. The internal temperature of the battery in the working state can be measured with high precision, so as to monitor the thermal performance of the battery in real time, prevent the occurrence of catastrophic accidents, and realize the rapid and in-situ measurement of the temperature parameters inside the battery.

[0075] 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", "axial", "radial", "circumferential" 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.

[0076] 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 at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0077] 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An internal temperature measurement battery, characterized in that: include: A plurality of positive electrode sheets, all arranged inside the internal temperature measurement battery; A plurality of negative electrode sheets are arranged inside the internal temperature measurement battery and are arranged alternately with the plurality of positive electrode sheets; a diaphragm is arranged between each adjacent negative electrode sheet and positive electrode sheet; An optical splitter installed inside the internal temperature measurement battery; There are more than one light reflecting unit; one light reflecting unit is installed on at least one of the diaphragms; each of the light reflecting units is connected to the optical splitter through an optical transmission line; the more than one light reflecting unit and the optical splitter constitute a temperature measuring component inside the internal temperature measuring battery for measuring the internal temperature of the internal temperature measuring battery.

2. The internal temperature measurement battery according to claim 1, characterized in that: A positive electrode tab is formed on the top of the plurality of positive electrode sheets; a negative electrode tab is formed on the top of the plurality of negative electrode sheets; Each of the light reflecting units comprises a plurality of light reflecting sub-units; the plurality of light reflecting sub-units are sequentially connected in series through the optical transmission line and connected to the optical splitter; At least one of the light reflecting subunits is mounted on the upper portion of the diaphragm and is located below the negative electrode tab; And / or, at least one of the light reflecting sub-units is installed on the upper part of the same diaphragm and is located below the positive electrode lug; and / or, at least one of the light reflecting subunits is mounted in the middle of the same diaphragm; And / or, at least one of the light reflecting sub-units is installed at the lower part of the same diaphragm and is located below the negative electrode ear; And / or, at least one of the light reflecting sub-units is installed at the lower part of the same diaphragm and is located below the positive electrode tab.

3. The internal temperature measurement battery according to claim 2, characterized in that: Each of the light reflecting subunits is pre-buried in the diaphragm or fixed on the surface of the diaphragm; And / or, at least one of the diaphragms is mounted with more than one supporting block.

4. The internal temperature measurement battery according to claim 2, characterized in that: The distance between the center of the light reflecting subunit installed on the upper part of the diaphragm and located below the negative electrode ear and the center of the negative electrode ear is 5 mm to 20 mm; The distance between the center of the light reflecting subunit installed on the upper part of the diaphragm and located below the positive electrode tab and the center of the positive electrode tab is 5 mm-20 mm.

5. The internal temperature measurement battery according to claim 2, characterized in that: Each of the light reflecting sub-units includes a plurality of fiber Bragg grating sensors which are sequentially spaced apart.

6. The internal temperature measurement battery according to claim 2, characterized in that: The optical transmission line is a single-mode optical fiber.

7. The internal temperature measurement battery according to claim 6, characterized in that: A plurality of conical holes are arranged on the single-mode optical fiber along the extending direction of the single-mode optical fiber; the centers of the cone bottoms of the plurality of conical holes are located on the same busbar of the single-mode optical fiber.

8. The internal temperature measurement battery according to any one of claims 1 to 7, characterized in that: A cover plate is provided on the top of the internal temperature measuring battery; Also includes: The accommodating box is installed on the bottom surface of the cover plate and is used to accommodate the optical splitter inside.

9. The internal temperature measurement battery according to claim 8, characterized in that: The accommodating box comprises: An upper shell, the top surface of which is fixedly connected to the bottom surface of the cover plate; The lower shell is detachably connected to the upper shell.

10. The internal temperature measurement battery according to claim 8, characterized in that: The cover plate is provided with a liquid injection hole and / or a pressure relief hole; Also includes: A positive electrode column, mounted on the cover plate; and / or, a negative electrode column mounted on the cover plate; and / or, an explosion-proof valve installed in the pressure relief hole; And / or, a pressing plate is installed on the top surfaces of the plurality of positive electrode sheets and the plurality of negative electrode sheets.

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