CN220358165U - Water system sodium ion battery system and electric vehicle - Google Patents
Water system sodium ion battery system and electric vehicle Download PDFInfo
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- CN220358165U CN220358165U CN202321257046.2U CN202321257046U CN220358165U CN 220358165 U CN220358165 U CN 220358165U CN 202321257046 U CN202321257046 U CN 202321257046U CN 220358165 U CN220358165 U CN 220358165U
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- sodium ion
- aqueous sodium
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 162
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 147
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000005070 sampling Methods 0.000 claims abstract description 22
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 22
- 229910052744 lithium Inorganic materials 0.000 claims description 22
- 229910001416 lithium ion Inorganic materials 0.000 description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- NCZYUKGXRHBAHE-UHFFFAOYSA-K [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] Chemical compound [Li+].P(=O)([O-])([O-])[O-].[Fe+2].[Li+] NCZYUKGXRHBAHE-UHFFFAOYSA-K 0.000 description 1
- FLAFBICRVKZSCF-UHFFFAOYSA-N [Li].[Co]=O.[Li] Chemical compound [Li].[Co]=O.[Li] FLAFBICRVKZSCF-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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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- Secondary Cells (AREA)
Abstract
The embodiment of the application provides a water system sodium ion battery system and electric motor car, relates to water system sodium ion battery technical field. The aqueous sodium ion battery system comprises a battery protection module and a plurality of aqueous sodium ion modules, wherein each aqueous sodium ion module comprises a plurality of aqueous sodium ion cells, and all aqueous sodium ion cells in each aqueous sodium ion module are connected in series; each aqueous sodium ion module is connected to a battery protection module through a sampling line, and the battery protection module is used for being connected with a plurality of aqueous sodium ion modules and an external circuit in series to form a loop. When being connected to external circuit, when the overcharge appears, battery protection module detects that the voltage is too high, can break off the water system sodium ion module and external circuit's connection to play the protection battery and can not damage because of the excessive pressure.
Description
Technical Field
The application relates to the technical field of sodium ion batteries, in particular to a water system sodium ion battery system and an electric vehicle.
Background
There are two kinds of voltage protection functions in the existing lithium battery protection board: voltage overcharge protection and voltage overdischarge protection.
The voltage overcharge protection is that when the voltage of the battery cell is higher than the upper limit voltage of charging, the protection board starts protection to stop charging the battery cell externally so as to protect the battery cell and prevent the battery cell from being overcharged.
When the voltage over-discharge protection is performed, the protection board starts the protection when the voltage of the battery core is lower than the lower limit voltage of discharge, and the battery core stops discharging to the outside, so that the effect of protecting the battery core and preventing the over-discharge of the battery core is achieved. The design of the existing lithium battery protection board in the market comprises the two functions.
However, for aqueous sodium ion batteries, there is no corresponding battery protection hardware in the market, so how to design battery protection hardware suitable for aqueous sodium ion batteries is a technical problem to be solved.
Disclosure of Invention
The utility model provides a technical problem of how to design the battery protection hardware that is applicable to aqueous sodium ion battery among the solution prior art to aqueous sodium ion battery system and electric motor car.
In order to achieve the above purpose, the following technical solutions are adopted in the embodiments of the present application.
In a first aspect, an embodiment of the present application provides a water-based sodium-ion battery system, including a battery protection module and a plurality of water-based sodium-ion modules, each water-based sodium-ion module including a plurality of water-based sodium-ion cells, all water-based sodium-ion cells in each water-based sodium-ion module being connected in series; each aqueous sodium ion module is connected to the battery protection module by a sampling line.
Compared with the prior art, the application has the following beneficial effects:
in the aqueous sodium ion battery system provided by the embodiment of the application, a plurality of aqueous sodium ion battery cores form an aqueous sodium ion module, a plurality of aqueous sodium ion modules are all connected to a battery protection module through sampling lines, and the plurality of aqueous sodium ion modules are connected with an external circuit through the battery protection module, so that when the battery protection module is connected to the external circuit and overcharges, the battery protection module detects that the voltage is too high, and the connection between the aqueous sodium ion module and the external circuit can be disconnected, so that the battery is protected from being damaged due to overvoltage.
Optionally, the two ends of all the water-based sodium ion cells in each water-based sodium ion module after being connected in series form an anode and a cathode of the water-based sodium ion module; the positive and negative poles of each aqueous sodium ion module are connected to the battery protection module by sampling lines.
Optionally, the two ends of all the water-based sodium ion cells in each water-based sodium ion module after being connected in series form an anode and a cathode of the water-based sodium ion module; all aqueous sodium ion modules are connected in series.
Optionally, the positive electrode and the negative electrode of the first water-based sodium ion module in the water-based sodium ion modules connected in series are connected to the battery protection module through sampling lines, and the negative electrodes of the other water-based sodium ion modules are connected to the battery protection module through sampling lines.
Optionally, the positive electrode and the negative electrode of the last water-based sodium ion module in the water-based sodium ion modules connected in series are connected to the battery protection module through sampling lines, and the positive electrodes of other water-based sodium ion modules are connected to the battery protection module through sampling lines.
Optionally, each of the aqueous sodium ion modules comprises the same number of aqueous sodium ion cores.
Optionally, each of the aqueous sodium ion modules includes an aqueous sodium ion core number value of 2, 3, 4 or 5.
Optionally, in the performance parameters of the battery protection module, the voltage for overvoltage protection of the single battery is 3.6V-4.5V.
Optionally, the battery protection module is a battery management system suitable for lithium batteries.
In a second aspect, embodiments of the present application provide an electric vehicle comprising the aqueous sodium ion battery system of the first aspect.
The electric vehicle may be a vehicle such as an electric bicycle/electric two-wheeled vehicle, an electric tricycle, or an electric automobile. The beneficial effects are that: the water-based sodium ion battery with the protection function is used as the energy source of the traffic tool.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a voltage-capacity test chart of an aqueous sodium ion battery according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a water system sodium ion module formed by connecting water system sodium ion cells in series according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a serial connection of aqueous sodium ion modules according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a water-based sodium ion battery system according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a simplified aqueous sodium ion battery system according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of two ways of forming a circuit of a simplified aqueous sodium ion battery system according to an embodiment of the present disclosure.
Description of the reference numerals
101-battery protection module
102-aqueous sodium ion module
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present application, it should be noted that the term "connected" should be interpreted in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium.
For aqueous sodium ion batteries, there is no corresponding battery protection hardware in the market. The lithium battery protection board protects the chip and is developed for adapting to the working voltage of the lithium battery. In the aqueous sodium-lithium ion battery, the working voltage does not intersect with the lithium ion battery, so that the protective plate of the lithium ion battery cannot be directly used.
While this technical hurdle exists, the present application overcomes this problem and proposes a solution to match aqueous sodium ion batteries with a protective plate for lithium batteries, as will be discussed in detail below. First, see the protection plate of lithium battery:
in the existing lithium battery protection board, the protection function is realized through a protection chip. The protection voltage setting range of the existing protection chip is developed for lithium batteries. There are generally two ranges:
the first is a protective chip made of lithium cobaltate and ternary material, whichThe overcharge protection voltage is 4.5VAbout, the over-discharge protection voltage is about 2.0V;
the second is a protective chip made of lithium iron phosphate material, whichThe overcharge protection voltage is 3.7VAbout, the over-discharge protection voltage is about 2.0V.
The number of the supporting battery cores in the existing lithium battery protection board is generally 2-32 strings, and the total voltage of the corresponding battery is 4-144V. Because the design of the total voltage of the battery is an adaptive electric appliance, if the position of the lithium ion battery core (2-4.5V) is replaced by adopting the water system sodium ion battery core (0-2V) to be adaptive, the number of the required battery cores connected in series can reach 3-72 strings, which is a scheme. This not only complicates the design of the protection plate, but also increases the possibility of errors in the protection plate.
The research shows that the water-based sodium ion battery and the lithium ion battery have a commonality: the voltage capacity curve of the aqueous sodium ion battery, the lithium cobalt oxide lithium ion battery or the lithium iron phosphate lithium ion battery is not a straight line, but a steeper region and a flatter region exist. In the area with a flatter curve, the voltage change is smaller every 1 unit of capacity is increased; in the region where the curve is steeper, the voltage change is larger for every 1 unit of capacity increase. Namely: the battery capacity is not evenly distributed over the voltage interval.
The research shows that the working voltage of the water-based sodium ion battery is an important difference from that of the lithium ion battery: although the operating voltage range of the aqueous sodium ion battery is about 0 to 2.0V, most of the capacity of the aqueous sodium ion battery is concentrated between 0 to 1.0V, the capacity ratio thereof is about 95% of the total capacity, and the remaining small capacity, for example, 5% of the capacity is between 1 to 2V.
Referring to fig. 1, fig. 1 is a voltage-capacity test curve of an aqueous sodium ion battery, and the horizontal axis represents SOC discharge amount, and the vertical axis represents voltage (V), it can be seen that: in the initial one-point capacity, as the discharge capacity slightly increases, the voltage drops sharply, while most of the capacity is within 1V.
Because the working voltage range of the current aqueous sodium ion battery is about 0-2.0V, the single-cell working voltage range of the current aqueous sodium ion battery is not in the protection voltage range of the current lithium battery protection chip. The upper limit of the working voltage of the water-based sodium ion battery is far lower than 2.0VLithium ion battery working upper limit voltage 3.6V or 4.5VThe lower limit of the working voltage of the water-based sodium ion battery is also far lower than the lower limit of the working voltage of the lithium ion battery by 2.0V. The existing lithium battery protection board cannot be adapted to the use of a sodium ion battery. Therefore, software is used for modifying the lower limit protection voltage parameter in the protection board to enable the lower limit protection voltage to be 0, or the lower limit protection/over-discharge protection is cancelled.
According to the voltage-capacity curve test, the upper limit protection voltage may be set to be lower than 2V and may be as low as about 1V, that is, about 50% of the full capacity voltage.
Thus, the present application proposes: a small whole is formed by connecting 2-5 water-based sodium ion batteries in series, so that the working voltage of the small whole of the sodium ion battery is improved to a degree similar to that of a lithium ion battery core. The whole battery cell is used as a battery cell and then is designed in series-parallel connection, so that the condition that the water system sodium ion battery cell directly uses the lithium battery protection board can be satisfied.
For example: the working voltage range of the 1 water-based sodium ion battery is 0-2V, and the working voltage range of the whole is changed into 0-4V by connecting 2 water-based sodium ion battery cores in series, so that the upper voltage limit meets the protection voltage range of the existing lithium battery protection board.
For example: selecting a protection IC in the market, wherein the protection parameters are as follows: the overcharge protection voltage is 4.455-4.505V, and the overdischarge protection voltage is 2.470-2.540V. When the water system sodium ion battery core works in the voltage range of 0-2V, if 2 battery cores are selected to be connected in series to form a whole, the whole working voltage range of the battery core is 0-4V. When overcharging occurs as a whole, assuming that the IC is protected at 4.5V, the voltage division on each cell is 4.5/2=2.25V >2V, at which point there is a certain risk that the cell is already overcharged. When the water system sodium ion battery core is designed to work within the voltage range of 0-1V, 4 battery cores can be selected to be connected in series to form a whole. At this time, the whole working voltage range of the battery cell is 0-4V. When overcharging occurs as a whole, assuming the IC is protected at 4.5V, the voltage division across each cell is 4.5/4=1.125V, at which time the voltage of each cell does not exceed 2V, although the cell as a whole is already protected, without the risk of overcharging.
Namely, the present application proposes a concept: the serial-parallel structure of the battery cells in the battery module is changed to adapt to the protection range of the existing protection chip and the protection board. Can be implemented according to the following steps:
a. as shown in fig. 2, 2 to 5 aqueous sodium ion cells (3 aqueous sodium ion cells are shown in fig. 2) are connected in series, and the 2 to 5 aqueous sodium ion cells are regarded as an entirety as an aqueous sodium ion module 102. The aqueous sodium ion module 102 comprises a positive output line B1+ and a negative output line B1-;
b. repeating the step a to obtain a plurality of aqueous sodium ion modules 102, and positive output lines Bn+ and negative output lines Bn-;
c. connecting B1-with b2+, B2-with b3+, … … Bn-1-with bn+ to form n series-connected aqueous sodium ion modules 102, fig. 3 showing the case of n=3;
d. the lithium battery protection board is used as a battery protection module 101, and voltage sampling lines 1 to n+1 in the lithium battery protection board are respectively welded on B1+, B1-, B2-, B3-, B4-, … … Bn-, namely n water-based sodium ion modules 102 need n+1 voltage sampling lines;
e. and modifying upper limit protection voltage parameters in the protection plate by using software, so that the working voltage range of each water system sodium ion battery cell is between 0 and 1.0V.
In the aqueous sodium ion battery system thus formed, a plurality of aqueous sodium ion modules are connected in series and then connected to an external circuit through a battery protection module, for example, in fig. 4, b1+ is connected as a positive electrode to the external circuit, and B3-is connected to one end of the battery protection module and forms a negative electrode to the external circuit at the other end of the battery protection module. Or: b3-is used as a negative electrode to be connected with an external circuit, B1+ is connected to one end of the battery protection module, and a positive electrode is formed at the other end of the battery protection module to be connected with the external circuit.
The above embodiments may be summarized. As shown in fig. 5, the embodiment of the present application provides a battery protection module 101 and a plurality of aqueous sodium ion modules 102, each aqueous sodium ion module 102 includes a plurality of aqueous sodium ion cells, and all aqueous sodium ion cells in each aqueous sodium ion module are connected in series; each aqueous sodium ion module (may be two ends after being connected in series, may be one end after being connected in series, or may be an intermediate electric core) is connected to the battery protection module 101 through a sampling line, and the plurality of aqueous sodium ion modules are connected to an external circuit through the battery protection module 101, so that two ways of fig. 6 form a loop (positions of the positive electrode and the negative electrode may be interchanged).
There are various ways in which each of the aqueous sodium ion modules 102 is connected to the battery protection module 101, and although a certain cell in the middle may be connected to the battery protection module 101, so that one test can be performed on the connected cell, if both ends (i.e., the positive electrode and the negative electrode of the entire aqueous sodium ion module 102) after being connected in series are used as connection points, the circuit can be simplified and the effect can be achieved for all the cells connected in series.
The plurality of aqueous sodium ion modules may be connected in parallel or in series.
If a plurality of aqueous sodium ion modules are connected in series, the circuit can be further simplified, and it is not necessary to connect both ends of all aqueous sodium ion modules 102 to the battery protection module 101, but one of the following embodiments can be selected:
1. the positive electrode and the negative electrode of the first water-based sodium ion module in the serial water-based sodium ion modules are connected to the battery protection module through sampling lines, and the negative electrodes of other water-based sodium ion modules are connected to the battery protection module through sampling lines;
2. the positive electrode and the negative electrode of the last water system sodium ion module in the water system sodium ion modules connected in series are connected to the battery protection module through sampling lines, and the positive electrodes of other water system sodium ion modules are connected to the battery protection module through sampling lines.
In order to simplify the control logic, the protection voltage of the overvoltage protection for each aqueous sodium ion module is set to be the same value, the number of aqueous sodium ion cores contained in each aqueous sodium ion module can be set to be the same, and each aqueous sodium ion core is the same, so that the voltage range of each aqueous sodium ion module is the same, and the protection voltage of the corresponding overvoltage protection is the same.
The number of the water-based sodium ion cores contained in each water-based sodium ion module is 2, 3, 4 or 5, so that the water-based sodium ion module can be matched with the battery management system of some existing lithium batteries, namely, the battery management system applicable to the lithium batteries can be selected as a battery protection module, and although the specification of the existing battery management system applicable to the lithium batteries only refers to the lithium batteries, the scheme is applicable to the same. The protection chip suitable for the sodium battery can be better adapted to the working condition of the sodium ion battery without new development.
Based on the above embodiments, the embodiment of the present application further provides an electric vehicle, where the electric vehicle may be a vehicle such as an electric bicycle/electric two-wheeled vehicle, an electric tricycle, or an electric automobile, and the electric vehicle includes the above aqueous sodium ion battery system.
In general, the application provides a water system sodium ion battery system and electric motor car, relates to water system sodium ion battery technical field. The aqueous sodium ion battery system comprises a battery protection module and a plurality of aqueous sodium ion modules, wherein each aqueous sodium ion module comprises a plurality of aqueous sodium ion cells, and all aqueous sodium ion cells in each aqueous sodium ion module are connected in series; each water-based sodium ion module is connected to the battery protection module through a sampling line, and a plurality of water-based sodium ion modules are connected with an external circuit through the battery protection module. When being connected to external circuit, when the overcharge appears, battery protection module detects that the voltage is too high, can break off the water system sodium ion module and external circuit's connection to play the protection battery and can not damage because of the excessive pressure.
The above-described embodiments of the apparatus and system are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the objectives of the present embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The water system sodium ion battery system is characterized by comprising a battery protection module and a plurality of water system sodium ion modules, wherein each water system sodium ion module comprises a plurality of water system sodium ion cells, and all water system sodium ion cells in each water system sodium ion module are connected in series; each aqueous sodium ion module is connected to the battery protection module through a sampling line, and the battery protection module is used for being connected with a plurality of aqueous sodium ion modules and an external circuit in series to form a loop.
2. The aqueous sodium ion battery system of claim 1, wherein the two ends of each aqueous sodium ion module after all aqueous sodium ion cells in the aqueous sodium ion module are connected in series form an anode and a cathode of the aqueous sodium ion module; the positive and negative poles of each aqueous sodium ion module are connected to the battery protection module by sampling lines.
3. The aqueous sodium ion battery system of claim 1, wherein the two ends of each aqueous sodium ion module after all aqueous sodium ion cells in the aqueous sodium ion module are connected in series form an anode and a cathode of the aqueous sodium ion module; all aqueous sodium ion modules are connected in series.
4. The aqueous sodium ion battery system of claim 3 wherein the positive and negative poles of the first aqueous sodium ion module in the series are connected to the battery protection module by a sampling line and the negative poles of the other aqueous sodium ion modules are connected to the battery protection module by a sampling line.
5. The aqueous sodium ion battery system of claim 3 wherein the positive and negative poles of the last aqueous sodium ion module in the series of aqueous sodium ion modules are connected to the battery protection module by sampling lines and the positive poles of the other aqueous sodium ion modules are connected to the battery protection module by sampling lines.
6. The aqueous sodium ion battery system of claim 1 wherein each of the aqueous sodium ion modules comprises the same number of aqueous sodium ion cells.
7. The aqueous sodium ion battery system of claim 1, wherein each of the aqueous sodium ion modules comprises an aqueous sodium ion cell count value of 2, 3, 4, or 5.
8. The aqueous sodium ion battery system according to claim 1, wherein a battery management system having a voltage of 3.6V to 4.5V for overvoltage protection of the unit cells is selected as the battery protection module.
9. The aqueous sodium ion battery system of claim 1, wherein the battery protection module is a lithium battery management system.
10. An electric vehicle comprising the aqueous sodium ion battery system of any one of claims 1-9.
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| CN202321257046.2U CN220358165U (en) | 2023-05-23 | 2023-05-23 | Water system sodium ion battery system and electric vehicle |
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| CN202321257046.2U CN220358165U (en) | 2023-05-23 | 2023-05-23 | Water system sodium ion battery system and electric vehicle |
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