CN218385376U - Battery module internal pressure detection device and battery module production device - Google Patents
Battery module internal pressure detection device and battery module production device Download PDFInfo
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- CN218385376U CN218385376U CN202222772637.5U CN202222772637U CN218385376U CN 218385376 U CN218385376 U CN 218385376U CN 202222772637 U CN202222772637 U CN 202222772637U CN 218385376 U CN218385376 U CN 218385376U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a battery module internal pressure detection device and a battery module production device, which relate to the technical field of battery module production and comprise a battery module shell, a detection unit and a battery module formed by stacking a plurality of battery pole pieces; the battery module is arranged in the battery module shell, and the detection unit is arranged on the outer surface of one side of the battery module according to a preset nine-square-grid pattern; the detection unit is used for detecting the internal pressure of the battery module, and the technical problem of inconsistent internal pressure of the battery module is solved.
Description
Technical Field
The utility model belongs to the technical field of the technique of battery module production and specifically relates to a battery module internal pressure detection device and battery module apparatus for producing are related to.
Background
With the rapid development of electric vehicle technology, the market holding amount of electric vehicles is sharply increased, and the requirement of the driving range of the battery and the requirement of the energy density of the battery are increasingly greater.
Since the coating amount of the battery becomes high due to an excessively high energy density requirement, the service life of the battery is affected by the non-uniform coating of the battery, and thus the service life of the battery is also subjected to a great stress.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery module internal pressure detection device and battery module apparatus for producing to the inconsistent technical problem of battery module internal pressure has been alleviated.
In a first aspect, an embodiment of the present invention provides a battery module internal pressure detection apparatus, include: the battery module comprises a battery module shell, a detection unit and a battery module formed by stacking a plurality of battery pole pieces; the battery module is arranged in the battery module shell, and the detection unit is arranged on the outer surface of one side of the battery module according to a preset Sudoku pattern;
the detection unit is used for detecting the internal pressure of the battery module.
With reference to the first aspect, embodiments of the present invention provide a first possible implementation manner of the first aspect, wherein a liquid injection hole is formed in the battery module case, and each of the detection units is further provided with a lead wire, and the lead wire is led out from the liquid injection hole;
and the liquid injection hole is used for injecting liquid into the battery module for packaging.
In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the second possible implementation manner further includes a high temperature corrosion resistant glue, and the high temperature corrosion resistant glue is used to fix the lead in the liquid injection hole.
In combination with the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the detecting unit includes a plurality of detecting units, each detecting unit is disposed according to a target position on an outer surface of one side of the battery module, and the target positions are distributed according to a preset nine-square pattern.
In combination with the first aspect, embodiments of the present invention provide a fourth possible implementation manner of the first aspect, wherein a graphite layer is coated on a negative electrode of the pole piece, and the graphite layer is used for embedding lithium ions of the positive electrode of the pole piece.
In combination with the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the negative graphite layer capacity of the pole piece is 1.1 times of the positive lithium ion capacity of the pole piece.
In combination with the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the sixth possible implementation manner further includes a thinning unit, configured to, when the internal pressure of the target location exceeds a pressure threshold, perform a thinning operation on the graphite layer or the battery module case that the target location corresponds to.
In combination with the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the thinning unit is further configured to perform the thinning operation on the graphite layer or the thickness of the battery module housing according to one hundredth of areal density at each time.
In combination with the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, wherein the detection unit is further configured to detect an internal pressure of the battery module under a condition of cycling charge and discharge within a preset time period.
In a second aspect, the embodiment of the present invention further provides a battery module production apparatus, which includes the above-mentioned battery module internal pressure detection apparatus.
The embodiment of the utility model provides a battery module internal pressure detection device and battery module apparatus for producing have been brought, through set up detecting element on battery module one side surface, and this detecting element sets up according to predetermineeing nine palace check pattern, can detect out the internal pressure of battery module by the accuracy to improve the battery module of the inconsistent position of pressure, produce more reliable battery module.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a device for detecting internal pressure of a battery module according to an embodiment of the present invention;
fig. 2 is a schematic distribution diagram of a detecting unit according to an embodiment of the present invention;
fig. 3 is a schematic top view of a device for detecting internal pressure of a battery module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery module according to an embodiment of the present invention.
Icon: 101-a battery module housing; 102-liquid injection hole; 103-a detection unit; 104-a lead; 105-a battery module; 106-pole piece; 107-adhesive tape; 108-positive electrode; 109-negative electrode; 110-high temperature corrosion resistant glue.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
At present, the nonuniform coating of the electrode powder in the battery can also cause the inconsistency of the internal pressure of the battery and the current density of different areas of the battery, the battery can cause nonuniform current under the same discharge rate, and the overcurrent phenomenon can exist in some areas, thereby affecting the service life of the battery.
Based on this, the embodiment of the utility model provides a pair of battery module internal pressure detection device and battery module apparatus for producing can detect through the internal pressure to battery module to improve the inhomogeneous position of pressure, in order to alleviate the inconsistent technical problem of battery module internal pressure.
The following is a detailed description by way of example.
Fig. 1 is a schematic structural diagram of a device for detecting internal pressure of a battery module according to an embodiment of the present invention.
Referring to fig. 1, the internal pressure detection apparatus of the battery module 105 includes: a battery module case 101, a detection unit 103, and a battery module 105 formed by stacking a plurality of battery pole pieces 106; the battery module 105 is arranged in the battery module shell 101, and the detection unit 103 is arranged on the outer surface of one side of the battery module 105 according to a preset Sudoku pattern;
the detection unit 103 is used to detect the internal pressure of the battery module 105.
In a practical preferred embodiment, the detection unit 103 is arranged on the outer surface of one side of the battery module 105, and the detection unit 103 is arranged according to a preset squared figure, so that the internal pressure of the battery module 105 can be accurately detected, the battery module 105 at the position with inconsistent pressure can be improved, and the more reliable battery module 105 can be produced.
In some embodiments, in order to ensure the accuracy of the internal pressure test, the detection unit 103 may be packaged into the battery module 105; illustratively, the battery module casing 101 is provided with a liquid injection hole 102, each detection unit 103 is further provided with a lead 104, and the lead 104 is led out from the liquid injection hole 102;
the liquid injection hole 102 is used for injecting and packaging the battery module 105.
It should be noted that, if the detection unit 103 is sealed in the battery module 105 by injection, the internal pressure of the battery module 105 can be detected more stably, and the internal pressure test accuracy is further ensured, where the battery module 105 sealed by injection is shown in fig. 4.
On the basis of the foregoing embodiment, in the liquid injection process of the battery module 105, the stability of the battery module 105 and the reliability of the internal pressure test of the battery module 105 can be further ensured by sealing the battery seal; illustratively, the sealing may be performed by a high temperature resistant glue 110, which has corrosion and high temperature resistance and is used to fix the lead 104 in the injection hole 102.
In some embodiments, the sensing unit 103 includes a plurality of, for example, any number of 1 to 9, and each of the sensing units 103 is disposed at one side outer surface of the battery module 105 according to a target position.
The target positions are distributed according to a preset nine-square grid pattern, and the detection units 103 distributed in this way can more accurately detect the internal pressure of the battery module 105. As shown in fig. 2, the detection unit 103 is disposed at the center of each cell of the grid of the squared figure, and the detection unit 103 may select a strain gauge and apply a temperature-resistant and corrosion-resistant adhesive tape 107 to fix both the lead 104 and the strain gauge at the center, i.e., the target position. The thickness of the tape 107 was 0.1mm.
In some embodiments, as shown in fig. 3, the top of the battery module housing 101 is provided with a positive electrode 108 and a negative electrode 109, the lead 104 extends out of the injection hole 102, and the injection hole 102 is sealed by a high temperature corrosion resistant glue 110.
The negative electrode 109 of the pole piece 106 is coated with a graphite layer, and the graphite layer is used for embedding lithium ions of the positive electrode 108 of the pole piece 106. The capacity of the graphite layer of the negative electrode 109 of the pole piece 106 is 1.1 times of the lithium ion capacity of the positive electrode 108 of the pole piece 106.
In some embodiments, in order to process the battery module 105 with abnormal internal pressure, the battery module processing device further comprises a thinning unit for thinning the graphite layer or the battery module housing 101 corresponding to the target position if the internal pressure of the target position exceeds a pressure threshold.
As a preferred embodiment, the thinning unit is further configured to perform the thinning operation on the thickness of the graphite layer or the battery module case 101 at a per hundredth areal density.
It should be noted that if the internal pressure of the battery module 105 is abnormal, the target position of the abnormal pressure is generally at the center of the nine-grid cell, and for example, the battery module 105 corresponding to the second detecting unit, the fourth detecting unit and the eighth detecting unit, namely the second detecting unit, the fourth detecting unit and the eighth detecting unit, may bulge. In order to ensure the uniformity of the internal pressure of the battery modules 105, the production of the next batch of battery modules 105 may be improved according to the pressure detection result of the current internal pressure detection device for the battery modules 105. In the practical application process, if the pressures detected by the second detection unit, the fourth detection unit and the eighth detection unit are all abnormal, the thicknesses of the graphite layers or the battery module shells 101 at the positions of the second detection unit, the fourth detection unit and the eighth detection unit corresponding to the battery modules 105 of the next batch are reduced; preferably, the thinning process may be performed every time at an areal density of one percent of the thickness of the graphite layer or the battery module housing 101 so that the internal pressure of the battery modules 105 of the next batch is uniform.
In some embodiments, in order to further ensure the accuracy of the detection of the internal pressure of the battery module 105, the detection unit 103 is further configured to detect the internal pressure of the battery module 105 under the condition of cyclic charging and discharging within a preset time period.
The battery module 105 is charged and discharged circularly according to a 1C mode, and a pressure threshold value is calculated by taking an average value of all pressure data sums detected by all detection units 103 in a battery circulation preset time period; calculating a difference value between the pressure threshold value and the pressure value acquired by each detection unit 103 at each moment, comparing the difference value with a preset threshold value, and if the difference value exceeds the threshold value, determining that the internal pressure of the position where the detection unit 103 corresponding to the difference value is located is abnormal; the preset time period may be selected to be 20 weeks.
It is understood that the 1C mode may be understood as a mode in which the rechargeable battery performs a continuous discharge of the battery for one hour in units of a nominal capacity size of the battery.
The embodiment of the application can detect the stress conditions of different parts inside the battery module in the circulation process, so that the uniformity of the current inside the battery is improved, and the cycle life of the battery is prolonged.
In some embodiments, the embodiment of the utility model provides a still provides a battery module apparatus for producing, include as above battery module internal pressure detection device, still include the production main part, this production main part is connected with this battery module internal pressure detection device, through this battery module internal pressure detection device to the testing result of battery module internal pressure, can carry out the attenuate operation to the graphite layer or the battery module shell of the too big position of internal pressure, realize improving the production of next batch battery module, even make the internal pressure of next batch battery module even.
The embodiment of the utility model provides a battery module apparatus for producing has the same technical characteristic with the battery module internal pressure detection device that above-mentioned embodiment provided, so also can solve the same technical problem, reach the same technological effect.
In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and for example, the division of the units into only one type of logical function may be implemented in other ways, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a battery module internal pressure detection device which characterized in that includes: the battery module comprises a battery module shell, a detection unit and a battery module formed by stacking a plurality of battery pole pieces; the battery module is arranged in the battery module shell, and the detection unit is arranged on the outer surface of one side of the battery module according to a preset Sudoku pattern;
the detection unit is used for detecting the internal pressure of the battery module.
2. The battery module internal pressure detection device according to claim 1, wherein the battery module case is provided with a liquid injection hole, and each detection unit is further provided with a lead wire that is led out from the liquid injection hole;
the liquid injection hole is used for injecting liquid into and packaging the battery module.
3. The device for detecting the internal pressure of a battery module according to claim 2, further comprising a high-temperature corrosion-resistant glue for fixing the lead wire in the liquid injection hole.
4. The device for detecting the internal pressure of the battery module according to claim 1, wherein the detection unit comprises a plurality of detection units, each detection unit is arranged on one outer surface of the battery module according to a target position, and the target positions are distributed according to a preset nine-grid pattern.
5. The device for detecting the internal pressure of the battery module according to claim 4, wherein the negative electrode of the pole piece is coated with a graphite layer, and the graphite layer is used for embedding lithium ions of the positive electrode of the pole piece.
6. The device for detecting the internal pressure of the battery module according to claim 5, wherein the capacity of the negative graphite layer of the pole piece is 1.1 times of the capacity of the lithium ion of the positive pole of the pole piece.
7. The battery module internal pressure detection device according to claim 6, further comprising a thinning unit configured to, when the internal pressure at the target position exceeds a pressure threshold, perform a thinning operation on the graphite layer or the battery module case corresponding to the target position.
8. The battery module internal pressure detection device according to claim 7, wherein the thinning unit is further configured to perform a thinning operation on the thickness of the graphite layer or the battery module case at a time in terms of one percent areal density.
9. The apparatus for detecting the internal pressure of a battery module according to claim 1, wherein the detection unit is further configured to detect the internal pressure of the battery module during the cyclic charge and discharge within a preset time period.
10. A battery module production apparatus, characterized by comprising the battery module internal pressure detection apparatus according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222772637.5U CN218385376U (en) | 2022-10-20 | 2022-10-20 | Battery module internal pressure detection device and battery module production device |
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| CN202222772637.5U CN218385376U (en) | 2022-10-20 | 2022-10-20 | Battery module internal pressure detection device and battery module production device |
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| CN218385376U true CN218385376U (en) | 2023-01-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780009A (en) * | 2023-08-25 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
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2022
- 2022-10-20 CN CN202222772637.5U patent/CN218385376U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780009A (en) * | 2023-08-25 | 2023-09-19 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
| CN116780009B (en) * | 2023-08-25 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
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