CN211789349U

CN211789349U - Battery module

Info

Publication number: CN211789349U
Application number: CN202020188034.9U
Authority: CN
Inventors: 尚德华; 杨泽乾
Original assignee: Aopu Shanghai New Energy Co Ltd
Current assignee: Shanghai Lianzhisheng New Energy Technology Co ltd
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-10-27
Anticipated expiration: 2030-02-20

Abstract

Disclosed is a battery module. The utility model discloses an in the embodiment, the battery module includes: the battery module main part includes: the battery comprises at least one battery cell, a bottom tray and a module lower shell, wherein the bottom tray is fixed in the module lower shell, and the battery cells are fixed on the bottom tray and are separated from each other; the optical fiber demodulator is fixed on the outer side of the lower shell of the module; and the at least one group of optical fiber sensors comprise measuring optical fibers and a liquid collecting tray, the relative positions of the measuring optical fibers and the liquid collecting tray are fixed, the at least one group of optical fiber sensors are connected with the optical fiber demodulator through the measuring optical fibers of the at least one group of optical fiber sensors, and the at least one group of optical fiber sensors are fixed on the bottom tray and are positioned below the edge of the end part of the at least one battery cell. The utility model discloses can be under the condition of the volume of not increasing the battery module and complexity, realized timely, accurately monitoring that battery electrolyte revealed, safe and reliable can reduce the incident of revealing the cause because of lithium ion battery electrolyte by a wide margin.

Description

Battery module

Technical Field

The utility model relates to a lithium cell technical field especially relates to a battery module.

Background

Because the lithium ion battery has the advantages of large energy density, multiple cycle times, light weight, high performance and the like, the lithium ion battery becomes an indispensable important component in the electrochemical energy storage industry gradually, and is widely applied to various energy storage scenes. However, in the use process of the lithium ion battery using the organic electrolyte, due to various reasons such as improper use, abuse and external impact, the electrolyte leaks, and is easy to burn, so once the electrolyte leaks, effective measures are not taken in time, and the lithium ion battery using the organic electrolyte causes great harm to personnel property and the like.

At present, in the field of lithium battery modules or packaging, two electrolyte leakage monitoring schemes are mainly adopted, namely, a gas detection device is arranged in the packaging or the module, and if electrolyte leaks, the electrolyte can be gasified and detected; and secondly, a PH sensor is arranged at a fixed position in the package or the module package, and when electrolyte leaks, the PH value is detected to be changed greatly.

Among the above-mentioned correlation technique, thereby detect gaseous scheme of monitoring the weeping after through electrolyte gasification, the reaction is slow, needs inside high temperature to under the condition that has a large amount of weepings, can play fine detection effect, can not detect the revealing of electrolyte the very first time, thereby miss the time of best taking measures. Whether the scheme of weeping detects through monitoring pH value at fixed position, because general organic electrolyte presents the faintly acid, need the pH sensor of high accuracy on the one hand, on the other hand pH value survey receives the influence of temperature, and the protection requires highly and needs regular calibration, and the application receives strong electromagnetic influence in lithium cell group, and the accuracy can't be guaranteed to it is inconvenient to use.

Disclosure of Invention

For solving the above technical problem, it is desirable to provide a battery module that can monitor leakage of self-battery electrolyte safely, reliably, timely, and accurately without increasing the size and complexity of the battery module.

According to the utility model discloses an aspect provides a battery module, include:

the battery module main part includes: the battery comprises at least one battery cell, a bottom tray and a module lower shell, wherein the bottom tray is fixed in the module lower shell, and the battery cells are fixed on the bottom tray and are separated from each other;

the optical fiber demodulator is fixed on the outer side of the lower shell of the module;

and the at least one group of optical fiber sensors comprise measuring optical fibers and a liquid collecting tray, the relative positions of the measuring optical fibers and the liquid collecting tray are fixed, the at least one group of optical fiber sensors are connected with the optical fiber demodulator through the measuring optical fibers of the at least one group of optical fiber sensors, and the at least one group of optical fiber sensors are fixed on the bottom tray and are positioned below the edge of the end part of the at least one battery cell.

The utility model discloses an integrated inside monitoring that realizes battery module weeping in the battery module of optical fiber sensor and the optical fiber demodulator that will be used for detecting that electrolyte reveals, the utility model discloses can realize timely, accurately monitoring that battery electrolyte revealed under the condition of the volume of not increasing the battery module and complexity, safe and reliable can reduce the incident of revealing the cause because of lithium ion battery electrolyte by a wide margin.

Drawings

Fig. 1 is a schematic structural diagram of the battery module according to the present invention.

FIG. 2 is a schematic structural view of the optical fiber sensor fixed on the bottom tray of the present invention;

FIG. 3 is an illustration of an example of the relative position between the measurement optical fiber and the liquid collecting tray in the optical fiber sensor of the present invention;

fig. 4 is a schematic flow chart illustrating an assembling method of a battery module according to the present invention;

fig. 5 is a schematic flow chart of the leakage detection method for the middle battery module of the present invention.

Description of reference numerals:

10. a battery module; 11. a module lower housing; 12. a bottom tray; 13. an optical fiber sensor; 14. an optical fiber demodulator; 15. an electric core; 16. connecting the battery cell; 151. positive and negative pole columns; 17. a top partition; 18. an upper baffle plate bracket; 19. a module upper housing; 131. a measurement optical fiber; 132. and a liquid collecting disc.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. It should be noted that, in the case of conflict, the various embodiments and features thereof may be arbitrarily combined with each other.

As in the foregoing, in the technical field of monitoring of lithium ion battery modules or packs, when a lithium ion battery is impacted by external force, the battery cell is expanded and deformed, abused, welded and packaged infirm, and the like, electrolyte leakage occurs in the battery cell, and particularly welding or corner positions are easier to occur, which causes great potential safety hazards. Therefore, when the lithium battery is applied, a corresponding leakage monitoring scheme is required to be matched, so that safety accidents caused by electrolyte leakage are reduced. In the prior art, because the leakage of the electrolyte cannot be detected at the first time by using the traditional sensor or an indirect measurement method, the time for best taking measures is often missed; and because the sensor itself is far away from the battery module, and its monitoring signal also receives electromagnetic environment's interference easily, leads to unable real-time, effective, accurate detection electrolyte's the degree of revealing.

To the technical problem, the utility model discloses a basic concept provides a battery module, adopts optic fibre to detect revealing of electrolyte in the battery, realizes a battery module that has weeping from monitor function through integrated optical fiber sensor and optical fiber demodulator in battery module to realize the safe and reliable ground that battery electrolyte revealed, in time and accurately monitor under the condition of the volume of not increasing battery module and complexity, thereby reach and reduce the purpose because of the incident that lithium ion battery electrolyte revealed and cause by a wide margin.

Fig. 1 shows an exemplary structure of a battery module according to the present invention.

As shown in fig. 1, the battery module 10 of the present invention may include: battery module main part, optic fibre demodulator 14 and at least a set of fiber sensor 13, the battery module main part can include: housing 11 under at least one electric core 15, bottom tray 12 and the module, bottom tray 12 is fixed under the module in housing 11, and at least one electric core 15 is fixed on bottom tray 12 and is separated each other.

In some examples, the battery module 10 of the present invention may be a square aluminum case, a steel case, a plastic case battery module, or the like.

As shown in fig. 1, the fiber optic demodulator 14 may be secured outside the module lower housing 11.

As shown in fig. 1 and 2, at least one group of optical fiber sensors 13 is connected with the optical fiber demodulator 14 through the measuring optical fibers thereof, and the at least one group of optical fiber sensors 13 is fixed on the bottom tray 12 and is positioned below the end edge of at least one battery cell 15. Thus, when electrolyte leaks from the battery, the leakage or liquid accumulation is most likely to occur at the four corners below the battery, and the optical fiber sensor 13 is most easily detected by being mounted at these positions, so that the leakage of electrolyte can be detected at the first time.

As shown in fig. 3, the optical fiber sensor 13 includes a measuring optical fiber 131 and a drip pan 132, the relative position of the measuring optical fiber 131 and the drip pan 132 is fixed, the position of the measuring optical fiber 131 changes when there is liquid in the drip pan 132, and the optical position information measured by the measuring optical fiber changes at the same time, and whether liquid leakage occurs or not can be monitored by the optical position information.

As shown in fig. 2, the bottom tray 12 is provided with a hole at a position below the end edge of the battery cell 15, and the optical fiber sensor 13 may be fixedly mounted in the hole.

In the example of fig. 2, the measuring fibers 131 of at least one group of fiber sensors 13 may be combined into one group to be connected with the fiber demodulator 14.

For example, at least one group of optical fiber sensors 13 and at least one battery cell 15 may correspond to each other, and each group of optical fiber sensors 13 may include four optical fiber sensors 13, and the four optical fiber sensors 13 may be respectively installed in the holes of the bottom tray 12 at positions below the end edges of the corresponding battery cells.

In some examples, the optical fiber sensor 13 may be adhered to the hole of the bottom tray 12 by high strength glue. In addition, can also adopt other modes to fix, to fixed mode, the utility model discloses do not give the restriction.

In some examples, the bottom tray 12 may have a slope that is inclined to a position below the edge of at least one cell 15, so that liquid at any position on the bottom tray 12 flows to the liquid collecting tray 132 of the optical fiber sensor 13, thereby accurately and timely detecting the leakage of the battery.

As shown in fig. 1, the battery module body may further include: top baffle 17, go up baffle support 18, shell 19 and electric core connection piece 16 on the module. Wherein the top separator 17 may have a slot hole, the top separator 17 is disposed above at least one of the battery cells 15 and the positive and negative poles 151 and the explosion-proof valve of each of the battery cells 15 are exposed through the slot hole. At least one battery cell 15 can be connected in series and parallel through a positive and negative pole column 151 and a battery cell connecting sheet 16. An upper bulkhead bracket 18 is secured in the module upper housing 19 and rests on top of the top bulkhead 17, and the module upper housing 19 is secured to the top of the module lower housing 11.

In some examples, the bottom tray 12 may be provided with at least one recess, and each cell 15 is secured in one of the recesses such that at least one of the cells 15 is spaced apart from each other.

Fig. 4 shows an exemplary assembly method of the battery module 10 of the present invention. As shown in fig. 4, the exemplary assembly method may include:

step S401, fixedly mounting the bottom tray 12 in the module lower case 11;

specifically, the bottom tray 12 is fixed to the lower case 11 of the battery module by means of bolts.

In some examples, the bottom tray 12 may be made of plastic, and mainly functions to support and separate the cells 15, holes for installing the optical fiber sensors 13 are disposed at four corners below the cells 15, and a slope design with a certain inclination angle is adopted, so that liquid at any position flows to the liquid collecting tray 132 of the optical fiber sensors 13, the optical fiber sensors 13 are adhered to the holes at the bottom corners of the bottom tray 12 through high-strength glue, and several groups of measuring optical fibers 131 are combined into one group to be connected to the optical fiber demodulator 14.

In some examples, the lower housing 11 may be made of a sheet metal part, and mainly serves as a housing of the battery module 10 to support various components.

Step S402, fixing at least one group of optical fiber sensors at the position below the edge of the end part of the battery cell on the bottom tray;

specifically, holes for installing the optical fiber sensors 13 may be provided at four corners below each of the battery cells 15 on the bottom tray 12, and the bottom tray 12 adopts a slope design with a certain inclination angle, so that the liquid at any position flows to the liquid collecting tray 132 of the optical fiber sensors 13. For example, the optical fiber sensor 13 may be adhered to the bottom corner of the bottom tray 12 in the above-mentioned hole by high strength glue or the like. Thus, when electrolyte leaks from the battery, the leakage or liquid accumulation is most likely to occur at the four corners below the battery, and the optical fiber sensor 13 is most easily detected by being mounted at these positions, so that the leakage of electrolyte can be detected at the first time.

Step S403, fixedly mounting the optical fiber demodulator on the outer side of the lower shell of the module, and connecting at least one group of optical fiber sensors with the optical fiber demodulator;

specifically, the optical fiber demodulator 14 and the module lower shell 11 can be fixed in a bolt connection mode or the optical fiber sensor 13 is externally arranged outside the module 10 to independently form a part of the whole pack, and then the optical fiber 131 is connected into the optical fiber demodulator 14 to complete communication connection of corresponding electrical parts.

Step S404, placing at least one battery cell into a groove of a bottom tray one by one;

step S405, placing a top partition plate above at least one battery cell, and exposing positive and negative poles of each battery cell and an explosion-proof valve through corresponding slotted holes in the top partition plate;

step S406, fixing the cell connecting sheet and the positive and negative poles of the cell to realize series-parallel connection between at least one cell;

specifically, the battery cells 15 may be placed into the grooves of the bottom tray 12 one by one, and then the top partition 17 is placed above the battery cells 15, where the top partition 17 mainly serves to complete the relative fixation of the battery cells, so as to ensure that the adjacent battery cells 15 do not contact each other.

Specifically, when the structure of the top partition 17 is designed, the design of the slot holes may be performed according to the size of the corresponding battery cell 15, so that the positive and negative terminals 151 of the battery cell 15 and the explosion-proof valve are completely exposed, and then the battery cell connecting sheet 16 and the positive and negative terminals 151 of the battery cell 15 are fixed in a welding manner, thereby realizing series-parallel connection between the battery cells 15.

Step S407, fixedly mounting an upper partition bracket into an upper housing of the module;

specifically, the upper diaphragm bracket 18 and the module upper case 19 may be fixed by means of bolting.

Step S408, fixing the module upper shell and the module lower shell which are provided with the upper clapboard support, wherein the upper clapboard support is positioned on the top clapboard.

Specifically, the module upper housing 19 and the module lower housing 11 may be fixed by bolts, and all the structural members and the electrical components are fixed and connected at this time.

Fig. 5 shows an exemplary method for detecting leakage of the battery module 10 according to the present invention. As shown in fig. 5, the method for detecting leakage of the battery module 10 may include:

step S501, when the module works, the light beam incident from the light source in the optical fiber sensor passes through the test point via the measuring optical fiber and then is sent to the optical fiber demodulator, and the current optical position information is obtained after the demodulation of the optical fiber demodulator

Step S502, judging whether electrolyte leakage occurs according to the current light position information and the reference light position information obtained in advance.

In at least some embodiments, step S502 can include: a step 1 of calculating a difference between current light position information and the reference light position information; step a2, judging whether the difference exceeds a preset threshold value; step a3, when the difference exceeds the predetermined threshold, determining that electrolyte leakage has occurred. Here, if the difference does not exceed the predetermined threshold, it may be determined that there is no electrolyte leakage.

Specifically, when the module works, light beams incident from a light source in the optical fiber sensor pass through the test point through the optical fiber and then are sent to a detector in the demodulator, and the detected parameters are obtained after the demodulation of the demodulator. When no electrolyte leakage occurs, light normally passes through, and the position of the light is not changed when detected by the light detector, and is recorded as an initial position S0 (i.e., the above reference light position information); when electrolyte leakage occurs, light is refracted when passing through the electrolyte, the position of the light is deviated when the light is detected by the light detector after refraction and is recorded as a position Sx (namely the current light position information), when the difference value between the Sx and the S0 is larger than a preset threshold value, the electrolyte leakage can be judged, and therefore whether electrolyte leakage occurs in the battery cell can be known by comparing the parameters such as the light position information, and the electrolyte leakage monitoring function in the battery module is achieved. Here, the threshold value may be an empirical value, and a specific value thereof may be obtained by statistically analyzing experimental data.

In some examples, the above exemplary liquid leakage detection method may further include: and sending an alarm signal when the electrolyte leakage is judged to occur so as to prompt a user to replace the electrolyte in time.

The utility model discloses can monitor to independent lithium ion battery module for the optical fiber sensor and the optical fiber demodulator that detect the weeping are integrated inside battery module, do not increase battery module's volume and complexity, also have few influences to battery module energy density. In addition, the optical fiber has excellent electromagnetic and atomic radiation resistance, chemical properties of water resistance, high temperature resistance and corrosion resistance, and mechanical properties of light weight and softness, so that the optical fiber is very suitable for being applied to safety monitoring of a lithium ion module. The utility model provides a battery module, not only can be timely, accurately oneself detect revealing of lithium ion battery electrolyte, do not receive external environment's influence moreover, safe and reliable can reduce the incident of revealing the cause because of lithium ion battery electrolyte by a wide margin.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A battery module, characterized by includes:

2. The battery module of claim 1, wherein the bottom tray is provided with a hole at a position below an end edge of the cell, and the optical fiber sensor is mounted in the hole.

3. The battery module according to claim 2, wherein the optical fiber sensor is attached to the hole of the bottom tray by a high-strength adhesive.

4. The battery module of claim 1, wherein the bottom tray has a slope that slopes to a location below an edge of the at least one cell such that liquid at any location on the bottom tray flows toward a liquid collection tray of the fiber optic sensor.

5. The battery module according to claim 1, wherein the measuring fibers of at least one group of fiber optic sensors are combined into one group to be connected with the fiber optic demodulator.

6. The battery module according to claim 1, wherein the battery module body further comprises: the battery cell connecting piece comprises a top clapboard, an upper clapboard support, a module upper shell and a battery cell connecting piece;

the top clapboard is provided with a slotted hole, the top clapboard is arranged above the at least one battery cell, and a positive pole and a negative pole of each battery cell and an explosion-proof valve are exposed through the slotted hole;

the at least one electric core is connected in series and parallel through a positive pole and a negative pole of the electric core and the electric core connecting sheet;

the upper baffle bracket is fixed in the module upper shell and positioned above the top baffle, and the module upper shell is fixed on the top of the module lower shell.

7. The battery module of claim 1 or 6, wherein the bottom tray is provided with at least one recess, each of the cells being secured in one of the recesses such that the at least one cells are spaced apart from each other.