CN117977029A - Battery module, battery pack and vehicle - Google Patents
Battery module, battery pack and vehicle Download PDFInfo
- Publication number
- CN117977029A CN117977029A CN202410133512.9A CN202410133512A CN117977029A CN 117977029 A CN117977029 A CN 117977029A CN 202410133512 A CN202410133512 A CN 202410133512A CN 117977029 A CN117977029 A CN 117977029A
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- Prior art keywords
- cell assembly
- battery module
- battery
- flexible carrier
- breakage detection
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- 238000001514 detection method Methods 0.000 claims abstract description 62
- 239000000463 material Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention proposes a battery module (100) comprising: a cell assembly (1) formed by stacking a plurality of cells (11); a housing (2) that houses the battery cell assembly (1); and at least one breakage detection strip (3) attached to at least one portion of the cell assembly (1) in a stacking direction of the plurality of cells (11), configured to be adapted to emit a power outage signal when an amount of expansion of the cell assembly (1) exceeds a predetermined threshold. According to the battery module, the expansion of the battery cell assembly can be monitored by using the at least one fracture detection belt attached to the battery cell arrangement surface of the battery cell assembly in a simple, low-cost and space-saving mode, and whether the whole battery module is structurally fractured or not is further monitored. And through pasting the fracture detection area that has the narrow portion of breakable at the specific position of electric core subassembly, can discern when the battery module takes place structural fracture and arouse the position that the fracture took place. The invention also provides a corresponding battery pack and a vehicle.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a battery module, a battery pack and a vehicle with the battery pack.
Background
Power battery packs currently in use on the market generally include a battery module composed of a cell assembly formed by stacking a plurality of cells and a case accommodating the cell assembly. During operation, the battery cells are typically gradually expanded, and thus the total expansion of the battery cell assembly due to the superposition of the battery cells presents high challenges for the structural strength of the housing and thus for the overall structural strength of the battery module. In the actual use, the mechanical structure of the battery module is often broken, and the breakage can place the battery pack at a safety risk. The prior art mostly avoids the mechanical breakage of the battery module by reducing the expansion rate of the battery cells or increasing the mechanical structural strength of the module, but lacks a technique for monitoring the structural breakage of the battery module in a simple, low-cost and positionable manner.
Disclosure of Invention
The invention aims to provide a battery module, a battery pack and a vehicle with the corresponding battery pack, so as to at least partially solve the technical problems in the prior art.
According to a first aspect of the present invention, there is provided a battery module including:
a cell assembly formed by stacking a plurality of cells;
a housing the battery cell assembly; and
At least one breakage detection strip attached to at least one portion of the cell assembly in a stacking direction of a plurality of cells,
Wherein the breakage detection zone is configured to emit a power down signal when an amount of expansion of a respective portion of the cell assembly exceeds a predetermined threshold.
In one exemplary embodiment, the fracture detection tape includes a flexible carrier and conductive wiring attached to the flexible carrier, the flexible carrier being adapted to be adhered to the cell assembly along the stacking direction.
In an exemplary embodiment, the predetermined threshold value is dependent on an expansion fracture characteristic of a material of the housing.
In one exemplary embodiment, the breakage detection strip is made of a flexible printed circuit.
In one exemplary embodiment, the flexible carrier has a wide portion and at least one narrow portion of reduced width located between the wide portions such that the tensile strength of the fracture detection zone is lower at the narrow portion than at the wide portion.
In one exemplary embodiment, the narrow portion is formed by making a notch over the width of the flexible carrier at a predetermined location of the flexible carrier.
In one exemplary embodiment, the width of the narrow portion is configured to allow the conductive wiring to pass through.
In one exemplary embodiment, the flexible carrier is affixed to the cell assembly at a location other than the narrow portion.
In one exemplary embodiment, the flexible carrier is affixed to the cell assembly with a margin of adhesion in length.
In one exemplary embodiment, at least one end of each of the breakage detection strips is adapted for electrical connection with an external device.
In one exemplary embodiment, the battery module includes the breakage detection strip attached along a central axis on a cell arrangement face of the cell assembly.
In one exemplary embodiment, the battery module includes the breakage detection band attached to a predetermined position of a side and/or end of a cell arrangement surface of the cell assembly.
In one exemplary embodiment, the battery module includes the breakage detection strip attached to a corner region of the cell arrangement face of the cell assembly.
In an exemplary embodiment, the length dimension, width dimension, narrow portion relative dimension, and/or adhesion margin of the break detection strip are dependent on the respective predetermined threshold and the stretch-break characteristics of the break detection strip.
According to a second aspect of the present invention, there is provided a battery pack comprising: the battery module according to the first aspect of the invention; and a battery pack controller configured to receive a power-down signal from the breakage detection zone, and in particular to identify a site of excessive expansion of the cell assembly based on the received power-down signal.
According to a third aspect of the present invention, there is provided a vehicle comprising the battery pack according to the second aspect of the present invention.
The present invention according to the above aspects of the present invention has the advantage that it is possible to monitor whether structural breakage of the battery module occurs using at least one breakage detection band attached to the battery cell assembly of the battery module, and such breakage detection band can be provided in a simple manner and at low cost, and does not substantially require additional space. And through pasting the fracture detection area that has the narrow portion of breakable at the specific position of electric core subassembly, can discern the excessive expansion position that leads to the battery module to take place structural fracture on the electric core subassembly.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the present invention in more detail with reference to the drawings. The drawings include:
fig. 1 schematically illustrates a battery module according to an exemplary embodiment of the present invention;
fig. 2 schematically illustrates a breakage detection band of a battery module according to an exemplary embodiment of the present invention;
fig. 3 schematically illustrates a breakage detection band of a battery module according to another exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous technical effects to be solved by the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 schematically shows a battery module 100 according to an exemplary embodiment of the present invention, in which a breakage detection band 3 is attached at a plurality of exemplary sites on one cell arrangement surface as an upper surface of a cell assembly 1. Fig. 2 schematically illustrates a breakage detection band 3 of a battery module according to an exemplary embodiment of the present invention. Fig. 3 schematically illustrates a breakage detection band 3 of a battery module according to another exemplary embodiment of the present invention.
As shown in fig. 1, a battery module 100 according to an exemplary embodiment of the present invention includes a battery cell assembly 1 formed by stacking a plurality of battery cells 11, a case 2 fixedly receiving the battery cell assembly 1, and a plurality of breakage detection bands 3 attached to the battery cell assembly 1 at a plurality of locations. The battery module according to the present invention is not limited to the battery module 100 shown in fig. 1, for example, in which the case may include an upper cover covering the upper surface of the battery cell assembly in fig. 1, and the breakage detection band 3 may be attached to other battery cell arrangement surfaces of the battery cell assembly 1 other than the upper surface.
The cells 11 may expand during operation, and the expansion of individual cells 11 or the total expansion of the entire cell assembly 1 caused by the expansion of a plurality of cells 11 may cause structural breakage of the battery module 100, for example, breakage of side surfaces, end surfaces or edge connections of the case 2, thereby causing safety risks. And the breakage detection band 3 attached to the battery cell assembly 1 is configured to be adapted to emit a power-off signal when the corresponding portion of the battery cell assembly 1 is excessively expanded by more than a corresponding predetermined threshold value, thereby assisting in monitoring the structural breakage of the battery module 100. The predetermined threshold value may depend, for example, on the site to which the adhesive is applied or detected and the expansion fracture characteristics of the material of the structural components of the battery module 100 including the case 2. More specifically, the predetermined threshold value is the amount of site expansion of the battery cell assembly 1 that can cause structural breakage of the battery module 100, which may be a value calculated based on the tensile breakage performance of the material of the structural member of the battery module 100, which may of course be also determined in connection with a test.
As shown in fig. 2 and 3, the breakage detection band 3 includes a flexible carrier 31 and conductive wiring 32 attached to the flexible carrier, the flexible carrier 31 is adapted to be adhered to the surface of the cell assembly 1, in particular, to the cell arrangement surface of the cell assembly 1 in the stacking direction of the cells 11, and the conductive wiring 32 is supplied with electric current. The flexible carrier 31 has a wide portion 311 and at least one narrow portion 312 of reduced width between the wide portions 311, the width of the narrow portion 312 allowing at least the conductive wiring 32 to pass. With such a shape structure, the tensile strength of the breakage detection band 3 at the narrow portion 312 is obviously lower than that at the wide portion 311, and therefore the breakage detection band 3 is more easily broken at the narrow portion 312. The breakage at the narrow portion 312 causes the attached conductive wiring 32 to be disconnected, whereby the current is interrupted, i.e., a break electrical signal is generated.
In one embodiment, the breakage detection band 3 may be made of a flexible printed circuit having thin, soft, low-strength characteristics, which is adapted to be broken at a certain elongation by being configured with a narrow portion, and thus is adapted to be used as the breakage detection band 3 for detecting the excessive expansion of the cell assembly 1.
In one embodiment, the narrow portion 312 is formed by making a notch over the width of the flexible carrier 31 at a predetermined location of the flexible carrier. For example, a notch may be made by removing part of the material of the flexible carrier 31 from both sides in the width direction by cutting, thereby obtaining the narrow portions 312 between the wide portions 311.
In one embodiment, the breakage detection band 3 is attached to the cell assembly 1 at a portion of the flexible carrier 31 other than the narrow portion 312. Preferably, the flexible carrier 31 is attached to the cell assembly 1 with an adhesive margin in terms of length. In this way, the expansion of the adhered corresponding battery cell 11 can drive the wide portion 311 of the breakage detection tape 3 to stretch the narrow portion 312, and the set adhesion margin enables the breakage detection tape 3 to allow the battery cell 11 to expand properly without being torn, i.e. the battery cell 11 will be broken at the narrow portion 312 when the expansion amount reaches the predetermined threshold, so as to reduce the false detection of the structural breakage of the battery module. The remaining adhesion margin may be determined based on the respective predetermined threshold value and the tensile fracture characteristic of the fracture detection tape 3 itself, and may be determined by a test.
At least one end of each breakage detection band 3 is adapted to be electrically connected with an external device, for example, directly or indirectly through a connector, to a battery pack controller of a battery pack to be described later, to transmit an electrical-power-off signal when the narrow portion 312 is broken. In the example shown in fig. 2, the conductive wiring 32 passes through the narrow portion 312 once unidirectionally, and the breakage detection band 3 is electrically connected to an external device at both ends. In the example shown in fig. 3, the conductive wiring 32 is folded back in the flexible carrier 31 once, whereby the breakage detection band 3 can be electrically connected with an external device at one end. The fracture detection zone 3 of both examples can be flexibly selected and arranged to achieve reasonable detection and routing.
In one application example, the battery module 100 may include a breakage detection 3 attached along a central axis on the cell arrangement surface of the cell assembly 1, so that the overall expansion amount of the cell assembly 1 can be monitored, that is, the breakage is generated to give a power-off signal when the overall expansion amount of the cell assembly 1 exceeds a corresponding predetermined threshold. In another application example, the battery module 100 may include a breakage detection band 3 attached to a side and/or end of the cell arrangement surface of the battery cell assembly 1 at a predetermined position, so that the local expansion amount of the battery cell assembly 1 at a specific position, which is likely to cause structural breakage of the battery module 1, can be monitored. In other alternative application examples, the battery module 100 may further include a breakage detection tape 3 attached to a corner region of the cell arrangement face of the cell assembly 1, so that the local expansion amount of the cell assembly 1, which causes breakage at the corner of the case 2, for example, can be monitored. Similar to the determination of the above-described adhesion margin, the length dimension, the width dimension, and/or the narrow portion relative dimension of the breakage detection tape 3 compared to the wide portion may be determined according to the predetermined threshold value of the corresponding portion and the stretch-break characteristic of the breakage detection tape 3, so that the occurrence of breakage of the case can be appropriately detected. Further, since an ID can be assigned to each of the breakage detection bands 3, it is possible to know which portion of the cell assembly 1 has been excessively expanded when a breakage occurs in a certain breakage detection band 3.
The present invention also provides a battery pack including the battery module 100 according to any one of the exemplary embodiments of the present invention described above and a battery pack controller configured to be adapted to receive a power-off signal from the breakage detection band 3. In a preferred embodiment, the battery pack controller is configured to be able to identify the location of the cell assembly 1 where the over-expansion occurred, for example by identifying the ID of the breakage detection zone 3 that sent the power-off signal.
The present invention also provides a vehicle including the battery pack according to the exemplary embodiment of the present invention.
Although specific embodiments of the invention have been described in detail herein, they are presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A battery module (100), comprising:
a cell assembly (1) formed by stacking a plurality of cells (11);
a housing (2) that houses the cell assembly (1); and
At least one fracture detection strip (3) attached to at least one portion of the cell assembly (1) along a stacking direction of a plurality of cells (11),
Wherein the breakage detection band (3) is configured to be adapted to emit a power-off signal when the amount of expansion of the respective portion of the cell assembly (1) exceeds a predetermined threshold.
2. The battery module (100) according to claim 1, wherein,
The fracture detection strip (3) comprises a flexible carrier (31) and conductive wires (32) attached to the flexible carrier (31), wherein the flexible carrier (31) is suitable for being adhered to the cell assembly (1) along the stacking direction; and/or
The predetermined threshold value depends on the expansion fracture characteristics of the material of the housing (2).
3. The battery module (100) according to claim 2, wherein,
The fracture detection belt (3) is made of a flexible printed circuit; and/or
The flexible carrier (31) has a wide portion (311) and at least one narrow portion (312) of reduced width between the wide portions (311) such that the tensile strength of the fracture detection zone (3) is lower at the narrow portion (312) than at the wide portion (311).
4. The battery module (100) according to claim 3, wherein,
-Forming the narrow portion (312) by making a notch over the width of the flexible carrier (31) at a predetermined position of the flexible carrier (31); and/or
The width of the narrow portion (312) is configured to allow the conductive wiring (32) to pass through.
5. The battery module (100) according to claim 3 or 4, wherein,
-The flexible carrier (31) is glued to the cell assembly (1) at a location other than the narrow portion (312); and/or
The flexible carrier (31) is adhered to the cell assembly (1) with an adhesive margin in terms of length.
6. The battery module (100) according to any one of claims 1 to 5, wherein,
At least one end of each of the breakage detection strips (3) is adapted to be electrically connected to an external device.
7. The battery module (100) according to any one of claims 1 to 6, wherein,
The battery module (100) comprises the fracture detection belt (3) stuck along the central axis on the cell arrangement surface of the cell assembly (1);
The battery module (100) includes the breakage detection band (3) attached to a predetermined position of a side portion and/or an end portion of a cell arrangement surface of the cell assembly (1); and/or
The battery module (100) includes the breakage detection band (3) attached to a corner region of a cell arrangement surface of the cell assembly (1).
8. The battery module (100) according to claim 7, wherein,
The length dimension, width dimension, narrow portion relative dimension and/or adhesion margin of the breakage detection tape (3) depend on respective predetermined threshold values and tensile breakage characteristics of the breakage detection tape (3).
9. A battery pack, comprising:
The battery module (100) according to any one of claims 1 to 8; and
A battery pack controller configured to receive a power outage signal from the breakage detection zone (3), in particular to identify a site of excessive expansion of the cell assembly (1) based on the received power outage signal.
10. A vehicle, comprising:
the battery pack according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133512.9A CN117977029A (en) | 2024-01-31 | 2024-01-31 | Battery module, battery pack and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133512.9A CN117977029A (en) | 2024-01-31 | 2024-01-31 | Battery module, battery pack and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117977029A true CN117977029A (en) | 2024-05-03 |
Family
ID=90845467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410133512.9A Pending CN117977029A (en) | 2024-01-31 | 2024-01-31 | Battery module, battery pack and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117977029A (en) |
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2024
- 2024-01-31 CN CN202410133512.9A patent/CN117977029A/en active Pending
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