CN210142677U - Battery module, battery system with same and electric vehicle - Google Patents
Battery module, battery system with same and electric vehicle Download PDFInfo
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- CN210142677U CN210142677U CN201921347313.9U CN201921347313U CN210142677U CN 210142677 U CN210142677 U CN 210142677U CN 201921347313 U CN201921347313 U CN 201921347313U CN 210142677 U CN210142677 U CN 210142677U
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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 utility model discloses a battery module and have battery system and electric vehicle of this battery module. The battery module includes: a housing having a receiving cavity; the battery cell modules are arranged in the accommodating cavity and are arranged along a first direction; and a first pressure detector and a second pressure detector, each of the first pressure detector and the second pressure detector being disposed within the housing cavity, the plurality of cell modules being located between the first pressure detector and the second pressure detector in the first direction, wherein the first pressure detector is disposed on a first side of a first one of the plurality of cell modules, and the second pressure detector is disposed on a second side of a last one of the plurality of cell modules. According to the utility model discloses battery module has advantages such as the security performance is good.
Description
Technical Field
The utility model relates to a battery field specifically relates to battery module, still relates to battery system and electric vehicle who has this battery module.
Background
The recent event of an electric vehicle being out of operation to place a fire has raised concerns for the safety performance of electric vehicles by consumers. In the prior art, the state of health of a battery is judged by the degree of capacity fade of the battery. However, the degree of capacity fade of the battery does not reflect the safety performance of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a battery module and have battery system and electric vehicle of this battery module in order to overcome the problem that prior art exists.
The present application is based on the discovery and recognition by the inventors of the following facts and problems: there are two main reasons for causing the electric vehicle to smoke and ignite due to the battery: (1) the internal pressure of the battery cell is overlarge due to excessive gas generation of the battery cell, so that a seal of a soft package battery or an explosion-proof valve of a square battery is broken, and the battery cell leaks and is exposed in the air; (2) lithium is separated out from the negative electrode of the battery cell in the quick charging process, and the lithium dendrite pierces the diaphragm to cause short circuit and thermal runaway of the battery. If the negative electrode does not separate lithium, the expansion force of the battery core is increased slowly, but if the negative electrode separates lithium, the expansion force of the battery core is increased suddenly. Therefore, after intensive research, the inventors found that the swelling force of the battery cell is an important index for determining the safety performance (whether potential safety hazard exists) of the battery cell.
In order to achieve the above object, the present invention provides, in a first aspect, a battery module including: a housing having a receiving cavity; the battery cell modules are arranged in the accommodating cavity and are arranged along a first direction; and a first pressure detector and a second pressure detector, each of the first pressure detector and the second pressure detector being disposed within the housing cavity, the plurality of cell modules being located between the first pressure detector and the second pressure detector in the first direction, wherein the first pressure detector is disposed on a first side of a first one of the plurality of cell modules, and the second pressure detector is disposed on a second side of a last one of the plurality of cell modules.
According to the utility model discloses a battery module has the advantage that the security performance is good.
Preferably, the battery cell of each battery cell module is a soft-package battery cell.
Preferably, each of the first pressure detector and the second pressure detector is sheet-shaped.
Preferably, a ratio of an area of a main surface of the first pressure detector to an area of the first side of the first one of the plurality of cell modules is 0.01 to 0.3, and a ratio of an area of a main surface of the second pressure detector to an area of the second side of the last one of the plurality of cell modules is 0.01 to 0.3.
Preferably, each of the cell modules includes a plurality of cells, a graphite sheet and a first foam layer are disposed between two adjacent cells of each of the cell modules, a second foam layer is disposed between the first pressure detector and the first side surface of the first one of the plurality of cell modules, and a third foam layer is disposed between the second pressure detector and the second side surface of the last one of the plurality of cell modules.
Preferably, the ratio of the thickness of the first foam layer to the thickness of the battery cell is 0.01-0.2, the ratio of the thickness of the second foam layer to the thickness of the battery cell is 0.01-0.2, the ratio of the thickness of the third foam layer to the thickness of the battery cell is 0.01-0.2, and the shrinkage ratio of each of the first foam layer, the second foam layer and the third foam layer is 50-99%.
Preferably, the battery module further includes a plurality of third pressure detectors, the third pressure detector is disposed on the second side surface of the first one of the plurality of cell modules, the third pressure detector is disposed on the first side surface of the last one of the plurality of cell modules, and the third pressure detector is disposed on each of the first side surface and the second side surface of the remaining cell modules.
Preferably, a rigid partition plate is arranged between two adjacent cell modules, and the partition plate is located between two corresponding third pressure detectors.
The second aspect of the present invention provides a battery system, the battery system includes the battery module according to the first aspect of the present invention.
According to the utility model discloses a battery system has the advantage that the security performance is good.
The third aspect of the present invention provides an electric vehicle including a battery system according to the second aspect of the present invention.
According to the utility model discloses an electric vehicle has the advantage that the security performance is good.
Drawings
Fig. 1 is a schematic structural view of a battery module according to an embodiment of the present invention;
fig. 2 is an exploded view of a battery module according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The following describes a battery module 1 according to an embodiment of the present invention with reference to the drawings. As shown in fig. 1 and 2, a battery module 1 according to an embodiment of the present invention includes a housing 10, a plurality of cell modules 20, a first pressure detector 30, and a second pressure detector (not shown in the drawings).
The casing 10 has a housing cavity in which the plurality of cell modules 20 are disposed, and each of the first pressure detector 30 and the second pressure detector is disposed in the housing cavity. The plurality of cell modules 20 are arranged in the first direction. The plurality of cell modules 20 are located between the first pressure detector 30 and the second pressure detector in the first direction. Wherein the first pressure detector 30 is provided on a first side of a first one of the plurality of cell modules 20 and the second pressure detector is provided on a second side of a last one of the plurality of cell modules 20.
The first pressure detector 30 and the second pressure detector may detect an expansion force of the cells of the cell module 20. The larger one of the detection value of the first pressure detector 30 and the detection value of the second pressure detector may be selected as the expansion force P of the cells of the cell module 20.
When (expansion force P-first preset value)/the first preset value is less than or equal to a second preset value, the Battery Management System (BMS) does not perform a process; when the (expansion force P-the first preset value)/the first preset value is larger than the second preset value and is smaller than or equal to a third preset value, the Battery Management System (BMS) sends out an early warning signal; when the expansion force P-the first preset value/the first preset value is greater than the third preset value, it indicates that the battery cell produces excessive gas and/or the lithium dendrite precipitated from the negative electrode punctures the diaphragm, and the Battery Management System (BMS) controls the battery module 1 to stop working.
The first preset value is an expansion force of the cell in a normal state, for example, the second preset value may be 10%, and the third preset value may be 20%.
According to the utility model discloses battery module 1 is located the first pressure detector 30 and this second pressure detector of a plurality of electric core module 20's both sides through the setting to can detect the bulging force of electric core module 20. Further, it may be determined whether the cells of the cell module 20 are failed and whether a potential safety hazard exists according to the pressure detection values of the first pressure detector 30 and the second pressure detector.
Therefore, according to the utility model discloses battery module 1 has advantages such as the security performance is good.
As shown in fig. 1 and 2, in some embodiments of the present invention, the battery module 1 may include a housing 10, a cell module 20, a first pressure detector 30, and the second pressure detector. The housing 10 may be known and not relevant to the inventive point of the present application and is therefore not described in detail.
The plurality of cell modules 20 are arranged in the first direction. For example, the first direction may be a left-right direction. Each cell module 20 may include a plurality of cells, and the cells of each cell module 20 may be soft-packed cells.
As shown in fig. 2, each of the first pressure detector 30 and the second pressure detector is sheet-shaped. This not only makes it possible to more easily and conveniently arrange the first pressure detector 30 and the second pressure detector on the cell module 20 (battery cell), but also reduces the space occupied by the first pressure detector 30 and the second pressure detector, so that the space occupied by the cell module 20 can be increased.
The plurality of cell modules 20 are located between the first pressure detector 30 and the second pressure detector in the left-right direction. Wherein the first pressure detector 30 is provided on a left side surface of the leftmost one (first one) of the plurality of cell modules 20, and the second pressure detector is provided on a right side surface of the rightmost one (last one) of the plurality of cell modules 20.
Specifically, the first pressure detector 30 is provided on the left side surface of the leftmost cell module 20, and the second pressure detector is provided on the right side surface of the rightmost cell module 20.
In one embodiment of the present invention, the ratio of the area of the main surface of the first pressure detector 30 to the area of the first side of the first one of the plurality of cell modules 20 is 0.01 to 0.3, and the ratio of the area of the main surface of the second pressure detector to the area of the second side of the last one of the plurality of cell modules 20 is 0.01 to 0.3. It is thereby possible for the first pressure detector 30 and the second pressure detector to more accurately detect the expansion force of the cells of the cell module 20.
Wherein, the main surface of the first pressure detector 30 refers to the surface of the first pressure detector 30 having the largest area; the main surface of the second pressure detector refers to a surface of the second pressure detector having the largest area.
Specifically, the ratio of the area of the main surface of the first pressure detector 30 to the area of the left side surface of the leftmost cell module 20 is 0.01 to 0.3, and the ratio of the area of the main surface of the second pressure detector to the area of the right side surface of the rightmost cell module 20 is 0.01 to 0.3.
Preferably, the ratio of the area of the main surface of the first pressure detector 30 to the area of the first side of the first one of the plurality of cell modules 20 is 0.05-0.2, and the ratio of the area of the main surface of the second pressure detector to the area of the second side of the last one of the plurality of cell modules 20 is 0.05-0.2. It is thereby possible for the first pressure detector 30 and the second pressure detector to more accurately detect the expansion force of the cells of the cell module 20.
More preferably, the ratio of the area of the main surface of the first pressure detector 30 to the area of the first side of the first one of the plurality of cell modules 20 is 0.11 to 0.14, and the ratio of the area of the main surface of the second pressure detector to the area of the second side of the last one of the plurality of cell modules 20 is 0.11 to 0.14. It is thereby possible for the first pressure detector 30 and the second pressure detector to more accurately detect the expansion force of the cells of the cell module 20.
Each cell module 20 includes a plurality of cells. In some examples of the present invention, a graphite sheet 60 and a first foam layer 70 are disposed between two adjacent cells of each cell module 20. For example, for a cell module 20, the cell, the graphite sheet 60, the first foam layer 70, the cell, … …, the graphite sheet 60, the first foam layer 70, and the cell are arranged from left to right.
A second foam layer 50 may be provided between the first pressure detector 30 and the first side of the first one of the plurality of cell modules 20, and a third foam layer may be provided between the second pressure detector and the second side of the last one of the plurality of cell modules 20. The structure of the battery module 1 can thereby be made more rational.
Preferably, the first foam layer 70, the second foam layer 50 and the third foam layer may all be made of EVA.
In an example of the present invention, the ratio of the thickness of the first foam layer 70 to the thickness of the battery cell is 0.01-0.2, the ratio of the thickness of the second foam layer 50 to the thickness of the battery cell is 0.01-0.2, and the ratio of the thickness of the third foam layer to the thickness of the battery cell is 0.01-0.2. This prevents the first foam layer 70, the second foam layer 50, and the third foam layer from being too thick and thus absorbing a large amount of the cell expansion force, so that the first pressure detector 30 and the second pressure detector can more accurately detect the cell expansion force of the cell module 20.
Preferably, the ratio of the thickness of the first foam layer 70 to the thickness of the cell is 0.05-0.15, the ratio of the thickness of the second foam layer 50 to the thickness of the cell is 0.05-0.15, and the ratio of the thickness of the third foam layer to the thickness of the cell is 0.05-0.15. It is thereby possible for the first pressure detector 30 and the second pressure detector to more accurately detect the expansion force of the cells of the cell module 20.
More preferably, the ratio of the thickness of the first foam layer 70 to the thickness of the cell is 0.11-0.14, the ratio of the thickness of the second foam layer 50 to the thickness of the cell is 0.11-0.14, and the ratio of the thickness of the third foam layer to the thickness of the cell is 0.11-0.14. It is thereby possible for the first pressure detector 30 and the second pressure detector to more accurately detect the expansion force of the cells of the cell module 20.
Preferably, each of the first foam layer 70, the second foam layer 50 and the third foam layer has a shrinkage ratio of 50-99%.
In a specific example of the present invention, the battery module 1 further includes a plurality of third pressure detectors 40, the third pressure detector 40 is disposed on the second side surface of the first one of the plurality of cell modules 20, the third pressure detector 40 is disposed on the first side surface of the last one of the plurality of cell modules 20, and the third pressure detector 40 is disposed on each of the first side surface and the second side surface of the remaining cell modules 20.
Therefore, the swelling force of the battery cell of each battery cell module 20 can be detected by using the two pressure detectors, so that when the battery cell of the battery module 1 is detected to generate excessive gas and/or the lithium dendrite precipitated from the negative electrode pierces the diaphragm, the battery cell of which battery cell module 20 generates excessive gas and/or the lithium dendrite precipitated from the negative electrode pierces the diaphragm can be determined. Wherein, the remaining cell modules 20 refer to the cell modules 20 except for the first cell module 20 and the last cell module 20.
Specifically, the third pressure detector 40 is provided on the right side surface of the rightmost cell of the leftmost cell module 20, the third pressure detector 40 is provided on the left side surface of the leftmost cell of the rightmost cell module 20, and the third pressure detector 40 is provided on each of the left and right side surfaces of the remaining cell modules 20.
For example, for the battery module 1, the first pressure detector 30, the cell module 20, the third pressure detector 40, the cell module 20, the third pressure detector 40, the third pressure detector … …, the third pressure detector 40, the cell module 20, and the second pressure detector are arranged from left to right in sequence.
Preferably, a rigid partition is provided between two adjacent cell modules 20, and the partition is located between two corresponding third pressure detectors 40. The respective two third pressure detectors 40 refer to the third pressure detector 40 located between the adjacent two cell modules 20. The swelling force of the cells of the cell module 20 can thereby be detected more accurately.
For example, for the battery module 1, the first pressure detector 30, the cell module 20, the third pressure detector 40, the separator, the third pressure detector 40, the cell module 20, the third pressure detector 40, the separator, … …, the separator, the third pressure detector 40, the cell module 20, and the second pressure detector are arranged from left to right in sequence.
The utility model discloses still provide battery system. According to the utility model discloses battery system includes according to the utility model discloses above-mentioned embodiment's battery module 1. Therefore, according to the utility model discloses battery system has advantages such as the security performance is good.
The utility model discloses still provide electric vehicle. According to the utility model discloses electric vehicle includes according to the utility model discloses the battery system of above-mentioned embodiment. Therefore, according to the utility model discloses electric vehicle has advantages such as the security performance is good.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A battery module (1), characterized by comprising:
a housing (10), the housing (10) having a receiving cavity;
a plurality of cell modules (20), a plurality of the cell modules (20) being disposed within the housing cavity, the plurality of cell modules (20) being arranged along a first direction; and
a first pressure detector (30) and a second pressure detector, each of the first pressure detector (30) and the second pressure detector being disposed within the receiving cavity, the plurality of cell modules (20) being located between the first pressure detector (30) and the second pressure detector in the first direction, wherein the first pressure detector (30) is disposed on a first side of a first one of the plurality of cell modules (20), and the second pressure detector is disposed on a second side of a last one of the plurality of cell modules (20).
2. The battery module (1) according to claim 1, characterized in that the cells of each cell module (20) are pouch cells.
3. The battery module (1) according to claim 1, wherein each of the first pressure detector (30) and the second pressure detector is sheet-shaped.
4. The battery module of claim 3, wherein a ratio of an area of a major surface of the first pressure detector to an area of the first side of the first one of the plurality of cell modules is 0.01-0.3, and a ratio of an area of a major surface of the second pressure detector to an area of the second side of the last one of the plurality of cell modules is 0.01-0.3.
5. The battery module (1) according to claim 1, wherein each of the cell modules (20) comprises a plurality of cells, a graphite sheet (60) and a first foam layer (70) are disposed between two adjacent cells of each of the cell modules (20), wherein a second foam layer (50) is disposed between the first pressure detector (30) and the first side of the first one of the plurality of cell modules (20), and a third foam layer is disposed between the second pressure detector and the second side of the last one of the plurality of cell modules (20).
6. The battery module according to claim 5, wherein a ratio of a thickness of the first foam layer (70) to a thickness of the cell is 0.01-0.2, a ratio of a thickness of the second foam layer (50) to the thickness of the cell is 0.01-0.2, a ratio of a thickness of the third foam layer to the thickness of the cell is 0.01-0.2, and a shrinkage ratio of each of the first foam layer (70), the second foam layer (50), and the third foam layer is 50-99%.
7. The battery module (1) according to claim 1, further comprising a plurality of third pressure detectors (40), wherein the third pressure detector (40) is disposed on the second side of the first one of the plurality of cell modules (20), wherein the third pressure detector (40) is disposed on the first side of the last one of the plurality of cell modules (20), and wherein the third pressure detector (40) is disposed on each of the first and second sides of the remaining cell modules (20).
8. The battery module (1) according to claim 7, wherein a rigid partition is provided between two adjacent cell modules (20), and the partition is located between two corresponding third pressure detectors (40).
9. A battery system, characterized by comprising a battery module (1) according to any one of claims 1-8.
10. An electric vehicle characterized by comprising the battery system according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921347313.9U CN210142677U (en) | 2019-08-19 | 2019-08-19 | Battery module, battery system with same and electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921347313.9U CN210142677U (en) | 2019-08-19 | 2019-08-19 | Battery module, battery system with same and electric vehicle |
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| CN210142677U true CN210142677U (en) | 2020-03-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663315A (en) * | 2022-10-20 | 2023-01-31 | 国联汽车动力电池研究院有限责任公司 | Lithium ion battery module with multi-characteristic parameter charging early warning function and charging early warning method |
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2019
- 2019-08-19 CN CN201921347313.9U patent/CN210142677U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115663315A (en) * | 2022-10-20 | 2023-01-31 | 国联汽车动力电池研究院有限责任公司 | Lithium ion battery module with multi-characteristic parameter charging early warning function and charging early warning method |
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