CN109216784B - Power lithium ion battery pack for vehicle - Google Patents
Power lithium ion battery pack for vehicle Download PDFInfo
- Publication number
- CN109216784B CN109216784B CN201710514112.2A CN201710514112A CN109216784B CN 109216784 B CN109216784 B CN 109216784B CN 201710514112 A CN201710514112 A CN 201710514112A CN 109216784 B CN109216784 B CN 109216784B
- Authority
- CN
- China
- Prior art keywords
- battery
- battery module
- voltage
- battery pack
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention provides a power lithium ion battery pack for a vehicle, wherein the battery pack comprises a plurality of battery modules, wherein each battery module comprises a plurality of single batteries; the battery pack further comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the parameters of the battery module are abnormal, the bypass device is started, and the battery module is moved out of a loop of the battery pack; when the battery module detects that the parameters of the battery module are recovered to be within the normal range, the bypass device is closed, and the battery module is moved back to the circuit of the battery pack; the battery pack can monitor and adjust the working state of the battery module in time, thereby ensuring the normal working state of the battery module and avoiding the service life attenuation of the battery module caused by abnormal charging and discharging.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a power lithium ion battery pack for a vehicle.
Background
In order to meet the power and energy requirements of electric vehicles, the power batteries of the electric vehicles must be used in groups. Meanwhile, due to the requirements on the arrangement and control of the battery pack, the battery cells are usually combined into small battery modules in series and parallel, and then the battery modules are connected in series to meet the requirements of the vehicle on power. At present, a battery pack used in an electric vehicle is generally formed by connecting a plurality of battery monomers in parallel and in series, and the voltage at the output end of the battery pack can be improved by connecting the plurality of battery monomers in series. However, when the single cell is abnormal, the operation of the entire battery pack is affected.
Disclosure of Invention
The invention provides a power lithium ion battery pack for a vehicle, wherein the battery pack comprises a plurality of battery modules, wherein each battery module comprises a plurality of single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the parameters of the battery module are abnormal, the bypass device is started, and the battery module is moved out of a loop of the battery pack; when the battery module detects that the parameters of the battery module are recovered to be within the normal range, the bypass device is closed, and the battery module is moved back to the circuit of the battery pack; the battery pack can monitor and adjust the working state of the battery module in time, thereby ensuring the normal working state of the battery module and avoiding the service life attenuation of the battery module caused by abnormal charging and discharging.
The specific scheme is as follows:
a power lithium ion battery pack for a vehicle, wherein the battery pack comprises a plurality of battery modules, wherein each battery module comprises a plurality of single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the parameters of the battery module are abnormal, the bypass device is started, and the battery module is moved out of a loop of the battery pack; and when the battery module detection device detects that the parameters of the battery module are restored to be within the normal range, the bypass device is closed, and the battery module is moved back to the circuit of the battery pack.
Furthermore, the battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the parameters of the single battery are abnormal, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the parameters of the single batteries are recovered to be within the normal range, the bypass device is closed, and the single batteries are moved back to the loop of the battery module.
Further, the parameters detected by the battery module detection device are selected from voltage, temperature and heating speed.
Further, the parameters detected by the single battery detection device are selected from voltage, temperature and heating speed.
Further, the parameter detected by the battery module detecting device comprises a temperature rising speed.
Further, the parameter detected by the single battery detection device comprises a temperature rise speed.
Further, the method for preparing the battery pack comprises the step of forming and matching the single lithium ion battery.
The formation and matching steps of the single lithium ion battery comprise:
1) providing a group of lithium ion batteries to be formed, carrying out pulse charging on the batteries by using current of 0.02-0.05C, and stopping charging until the charging is cut off to voltage; wherein the pulse time is 0.1-10min, the interval time is 30-120s, and the charging cut-off voltage is 4.2-4.35V;
2) discharging the battery at a current of 0.05-0.2C until the discharge cutoff voltage is 2.7-2.8V;
3) repeating the step 1-2 for 0-3 times;
4) standing and aging for 1-5 days;
5) extracting electrolyte which is not immersed into the electrode in the battery shell, re-injecting new electrolyte, and sealing;
6) charging the battery with a current of 1-5C until the charging cut-off voltage is 4.2-4.35V, and discharging the battery with a current of 1-5C until the discharging cut-off voltage is 2.7-2.8V;
7) repeating the step 6 for 0-5 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of 3% and the temperature difference of 5 ℃ into a group.
The invention has the following beneficial effects:
1. by monitoring the working state of the battery module/single battery and adjusting the working state in time, the normal working state of the battery module/single battery is ensured, and the service life attenuation of the battery module/single battery due to long-term abnormal charging and discharging is avoided.
2. In the process of early formation, metal ions in the active material are inevitably partially dissolved into the electrolyte, and the process of forming the SEI film can also influence the composition of the electrolyte, and the influence can influence the performance of the battery, so that after the formation is finished, the electrolyte with changed components is extracted, and new electrolyte is injected again, and the storage life of the battery can be prolonged.
3. Concentration polarization on the surface of the electrode is eliminated by charging with a small current pulse, so that a uniform and stable SEI film is formed. The active material of the electrode was sufficiently activated by a large current charge-discharge cycle, and the rate performance of the battery was measured.
4. The heating value among different batteries is amplified by increasing the current, so that batteries with similar capacity and the same heat dissipation are configured into a battery pack more accurately according to the capacity and the heating value of the batteries, and the uniformity of the battery pack is improved.
The battery pack which is long in service life, stable in performance and good in single battery performance consistency is constructed by the method.
Detailed Description
The present invention will be described in more detail below with reference to specific examples, but the scope of the present invention is not limited to these examples.
Example 1
1) Providing a lithium ion battery to be formed, carrying out pulse charging on the battery with the current of 0.05C, and stopping charging until the voltage is cut off; wherein the pulse time is 10min, the interval time is 120s, and the charging cut-off voltage is 4.35V;
2) discharging the battery at a current of 0.2C to a discharge cutoff voltage, wherein the discharge cutoff voltage is 2.8V;
3) repeating the step 1-2 for 3 times;
4) standing and aging for 5 days;
5) the electrolyte which is not immersed in the electrode in the battery shell is extracted out, new electrolyte is injected again, and the sealing is carried out, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and the volume ratio is 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery with a current of 5C until the charging cut-off voltage is 4.35V, discharging the battery with a current of 5C until the discharging cut-off voltage is 2.8V;
7) repeating the step 6 for 5 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of 3% and the temperature difference of 5 ℃ into a group;
8) forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the voltage of a certain battery module deviates from the average module voltage by more than 10%, starting the bypass device, and moving the battery module out of a loop of the battery pack; when the battery module detection device detects that the voltage of the battery module deviates from the average module voltage by less than 5%, the bypass device is closed, and the battery module is moved back to the circuit of the battery pack.
Example 2
1) Providing a lithium ion battery to be formed, carrying out pulse charging on the battery with the current of 0.02C, and stopping charging until the voltage is cut off; wherein the pulse time is 0.1min, the interval time is 30s, and the charging cut-off voltage is 4.2V;
2) discharging the battery at a current of 0.05C to a discharge cutoff voltage, wherein the discharge cutoff voltage is 2.7V;
3) repeating the step 1-2 for 0 times;
4) standing and aging for 1 day;
5) the electrolyte which is not immersed in the electrode in the battery shell is extracted out, new electrolyte is injected again, and the sealing is carried out, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and the volume ratio is 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery with the current of 1C until the charging cut-off voltage is 4.2V, discharging the battery with the current of 1C until the discharging cut-off voltage is 2.7V;
7) repeating the step 6 for 1 time, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of 1% and the temperature difference of 2 ℃ into a group;
8) forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the voltage of a certain battery module deviates from the average module voltage by more than 10%, starting the bypass device, and moving the battery module out of a loop of the battery pack; when the battery module detects that the voltage of the battery module is within 5% of the average module voltage, closing a bypass device, and moving the battery module back to a loop of a battery pack, wherein the battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the deviation between the voltage of a certain single battery and the average battery voltage is greater than 10%, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the voltage of the single battery deviates from the average battery voltage by less than 5%, closing the bypass device, and moving the single battery back to the loop of the battery module.
Example 3
1) Providing a lithium ion battery to be formed, carrying out pulse charging on the battery with the current of 0.03C, and stopping charging until the voltage is cut off; wherein the pulse time is 2min, the interval time is 40s, and the charging cut-off voltage is 4.3V;
2) discharging the battery at a current of 0.1C to a discharge cutoff voltage, wherein the discharge cutoff voltage is 2.75V;
3) repeating the step 1-2 for 2 times;
4) standing and aging for 3 days;
5) the electrolyte which is not immersed in the electrode in the battery shell is extracted out, new electrolyte is injected again, and the sealing is carried out, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and the volume ratio is 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery by using the current of 3C until the charging cut-off voltage is 4.25V, and discharging the battery by using the current of 3C until the discharging cut-off voltage is 2.75V;
7) repeating the step 6 for 3 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of 2% and the temperature difference of 3 ℃ into a group;
8) forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the deviation between the temperature of a certain battery module and the average module temperature is more than 15%, starting the bypass device, and moving the battery module out of a loop of the battery pack; when the battery module detects that the temperature of the battery module is within 5% of the average module temperature, the bypass device is closed and the battery module is moved back to the battery pack loop. The battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the deviation between the temperature of a certain single battery and the average battery temperature is larger than 15%, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the temperature of the single battery deviates from the average battery temperature by less than 5%, closing the bypass device, and moving the single battery back to the loop of the battery module.
Example 4
1) Providing a lithium ion battery to be formed, carrying out pulse charging on the battery with the current of 0.04C, and stopping charging until the charging is cut off to the voltage; wherein the pulse time is 8min, the interval time is 80s, and the charging cut-off voltage is 4.25V;
2) discharging the battery at a current of 0.15C to a discharge cutoff voltage, wherein the discharge cutoff voltage is 2.75V;
3) repeating the step 1-2 for 2 times;
4) standing and aging for 2 days;
5) the electrolyte which is not immersed in the electrode in the battery shell is extracted out, new electrolyte is injected again, and the sealing is carried out, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and the volume ratio is 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery by using the current of 4C until the charging cut-off voltage is reached, wherein the charging cut-off voltage is 4.25V, discharging the battery by using the current of 4C until the discharging cut-off voltage is reached, and wherein the discharging cut-off voltage is 2.75V;
7) repeating the step 6 for 4 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of within 1% and the temperature difference of within 3 ℃ into a group;
8) forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the temperature rising speed of a certain battery module is higher than the average module temperature rising speed by 8 percent, the bypass device is started, and the battery module is moved out of a loop of the battery pack; and when the battery module detects that the temperature rising speed of the battery module is within 3% of the average module temperature rising speed, closing the bypass device, and moving the battery module back to the circuit of the battery pack. The battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the temperature rise speed of a certain single battery is higher than the average battery temperature rise speed by 8 percent, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the deviation of the temperature rise speed of the single battery and the average battery temperature rise speed is less than 3%, closing the bypass device, and moving the single battery back to the loop of the battery module.
Example 5
1) Providing a lithium ion battery to be formed, carrying out pulse charging on the battery with the current of 0.03C, and stopping charging until the voltage is cut off; wherein the pulse time is 5min, the interval time is 60s, and the charging cut-off voltage is 4.3V;
2) discharging the battery at a current of 0.1C to a discharge cutoff voltage, wherein the discharge cutoff voltage is 2.8V;
3) repeating the step 1-2 for 1 time;
4) standing and aging for 2 days;
5) the electrolyte which is not immersed in the electrode in the battery shell is extracted out, new electrolyte is injected again, and the sealing is carried out, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and the volume ratio is 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery by using the current of 2C until the charging cut-off voltage is reached, wherein the charging cut-off voltage is 4.3V, discharging the battery by using the current of 2C until the discharging cut-off voltage is reached, and wherein the discharging cut-off voltage is 2.8V;
7) repeating the step 6 for 4 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of within 1% and the temperature difference of within 2 ℃ into a group;
8) forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the temperature rising speed of a certain battery module is higher than the average module temperature rising speed by 5 percent, the bypass device is started, and the battery module is moved out of a loop of the battery pack; and when the battery module detects that the temperature rising speed of the battery module is within 2 percent of the average module temperature rising speed, closing the bypass device, and moving the battery module back to the circuit of the battery pack. The battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the temperature rise speed of a certain single battery is higher than the average battery temperature rise speed by 5 percent, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the deviation of the temperature rise speed of the single battery and the average battery temperature rise speed is within 2%, closing the bypass device, and moving the single battery back to the loop of the battery module.
Comparative example 1
Selecting a group of lithium ion batteries, carrying out charge-discharge circulation for three times, wherein the charge cut-off voltage is 4.2V, and the discharge cut-off voltage is 2.7V, and measuring the capacity of the lithium ion batteries;
2) and preparing a group of lithium ion batteries with the capacity difference within 1 percent.
8) And forming the batteries in the same group into a battery pack, wherein the battery pack comprises 8 battery modules, and each battery module comprises 10 single batteries.
Test and results
The battery uniformity performance test, which is to test the capacities of the unit cells in the batteries of examples 1 to 5 and comparative example 1 after cycling at normal temperature for 300 times, and calculate the maximum capacity difference of the battery modules in the battery pack and the percentage of the maximum capacity difference in the battery, shows that the deterioration between the battery modules and between the batteries of the battery pack of comparative example 1 is severe.
TABLE 1
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention.
Claims (6)
1. A power lithium ion battery pack for a vehicle is characterized in that,
1) the lithium ion battery is to be formed, the battery is subjected to pulse charging at the current of 0.05C, and the charging is stopped until the voltage is cut off; wherein the pulse time is 10min, the interval time is 120s, and the charging cut-off voltage is 4.35V;
2) discharging the battery at a current of 0.2C to a discharge cutoff voltage, the discharge cutoff voltage being 2.8V;
3) repeating the steps 1-2 for 3 times;
4) standing and aging for 5 days;
5) extracting electrolyte which is not immersed into the electrode in the battery shell, re-injecting new electrolyte, and sealing, wherein the new electrolyte comprises 1.2mol/L lithium hexafluorophosphate and a volume ratio of 1: 2: 1 of dimethyl carbonate, ethyl carbonate, a non-aqueous solvent consisting of ethyl methyl carbonate, and 5% of fluoroethylene carbonate;
6) charging the battery with a current of 5C until the charging cut-off voltage is 4.35V, discharging the battery with a current of 5C until the discharging cut-off voltage is 2.8V;
7) repeating the step 6 for 5 times, recording the capacity of the battery and the temperature of the battery, and matching the batteries with the capacity difference of less than 3% and the temperature difference of less than 5 ℃ into a group; wherein the battery pack includes a plurality of battery modules, wherein a battery module includes a plurality of unit cells; the battery pack also comprises a controller, a battery module detection device and a bypass device; when the battery module detection device detects that the parameters of the battery module are abnormal, the bypass device is started, and the battery module is moved out of a loop of the battery pack; when the battery module detection device detects that the parameters of the battery module are recovered to be within the normal range, the bypass device is closed, and the battery module is moved back to the circuit of the battery pack;
the battery module comprises a single battery detection device and a battery bypass device; when the single battery detection device detects that the parameters of the single battery are abnormal, the battery bypass device is started, and the single battery is moved out of a loop of the battery module; and when the single battery detection device detects that the parameters of the single batteries are recovered to be within the normal range, the bypass device is closed, and the single batteries are moved back to the loop of the battery module.
2. The battery pack according to claim 1, wherein the parameter detected by the battery module detecting means is selected from the group consisting of voltage, temperature, and temperature rising rate.
3. The battery pack according to claim 1, wherein the parameters detected by the cell detection means are selected from the group consisting of voltage, temperature, and temperature rise rate.
4. The battery pack according to claim 2, wherein the parameter detected by the battery module detecting means includes a temperature rise rate.
5. The battery pack according to claim 3, wherein the parameter detected by the cell detection means includes a temperature rise rate.
6. A method of manufacturing a battery according to any of claims 1 to 5, comprising the step of grouping the cells after activation of the cells.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710514112.2A CN109216784B (en) | 2017-06-29 | 2017-06-29 | Power lithium ion battery pack for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710514112.2A CN109216784B (en) | 2017-06-29 | 2017-06-29 | Power lithium ion battery pack for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109216784A CN109216784A (en) | 2019-01-15 |
| CN109216784B true CN109216784B (en) | 2021-12-14 |
Family
ID=64960517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710514112.2A Active CN109216784B (en) | 2017-06-29 | 2017-06-29 | Power lithium ion battery pack for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109216784B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003134683A (en) * | 2001-10-29 | 2003-05-09 | Nissan Motor Co Ltd | Controller for battery pack |
| JP2010239711A (en) * | 2009-03-30 | 2010-10-21 | Japan Research Institute Ltd | Battery control device, vehicle, and method of controlling the battery |
| CN102742066A (en) * | 2010-02-08 | 2012-10-17 | 福图知识产权股份公司 | High-current battery system and method for controlling a high-current battery system |
| CN204334072U (en) * | 2015-01-15 | 2015-05-13 | 上海电力设计院有限公司 | The battery pack of energy isolated fault battery module |
| CN105914333A (en) * | 2015-03-16 | 2016-08-31 | 中国新能源汽车有限公司 | Battery pack and connecting circuits of battery modules |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6977483B2 (en) * | 2002-08-23 | 2005-12-20 | Nissan Motor Co., Ltd. | Battery pack malfunction detection apparatus and method for detecting a disconnection at a connecting line between a given cell and a corresponding detection terminal |
| US20100164437A1 (en) * | 2008-10-24 | 2010-07-01 | Mckinley Joseph P | Battery formation and charging system and method |
| CN101728579A (en) * | 2008-10-28 | 2010-06-09 | 天空能源(洛阳)有限公司 | Rapid forming method of lithium ion power battery |
| CN201364934Y (en) * | 2009-02-27 | 2009-12-16 | 比亚迪股份有限公司 | Maintenance device for carrying out capacity grading matching on power battery pack |
| CN104218267B (en) * | 2014-07-30 | 2016-06-01 | 浙江超威创元实业有限公司 | A kind of lithium ion battery divides appearance method for group matching |
-
2017
- 2017-06-29 CN CN201710514112.2A patent/CN109216784B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003134683A (en) * | 2001-10-29 | 2003-05-09 | Nissan Motor Co Ltd | Controller for battery pack |
| JP2010239711A (en) * | 2009-03-30 | 2010-10-21 | Japan Research Institute Ltd | Battery control device, vehicle, and method of controlling the battery |
| CN102742066A (en) * | 2010-02-08 | 2012-10-17 | 福图知识产权股份公司 | High-current battery system and method for controlling a high-current battery system |
| CN204334072U (en) * | 2015-01-15 | 2015-05-13 | 上海电力设计院有限公司 | The battery pack of energy isolated fault battery module |
| CN105914333A (en) * | 2015-03-16 | 2016-08-31 | 中国新能源汽车有限公司 | Battery pack and connecting circuits of battery modules |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109216784A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107293812B (en) | Formation and matching method of lithium ion battery | |
| CN110416626B (en) | Formation method of lithium ion battery | |
| JP7076495B2 (en) | How to quickly group and repair used batteries | |
| CN102208685B (en) | Processing method for formation of lithium ion batteries | |
| CN110611133B (en) | Charging method of lithium ion battery management system | |
| CN102185166B (en) | Battery forming and repairing method | |
| CN106997960B (en) | Formation and capacity grading method for lithium ion battery | |
| CN105070963A (en) | Method for optimizing high-magnification power lithium ion battery SEI film | |
| CN110323506B (en) | Formation stabilizing method for lithium ion battery before storage | |
| CN111162337A (en) | Formation method of power lithium ion battery for high-temperature environment | |
| CN111276755A (en) | Preparation method of lithium ion battery with long storage performance | |
| CN104201420A (en) | Formation process for reducing self-discharge rate of battery core | |
| CN109216784B (en) | Power lithium ion battery pack for vehicle | |
| CN111725556A (en) | Storage method of lithium iron phosphate battery | |
| CN112038703B (en) | Preparation method of lithium ion battery | |
| CN112103581B (en) | Preparation method of lithium ion battery | |
| CN111416157B (en) | Preparation method of ternary lithium ion battery | |
| CN114879053A (en) | Method for predicting service life of energy storage lithium iron phosphate battery | |
| US20110043169A1 (en) | Charging Algorithm for Lithium Batteries | |
| CN112117505B (en) | Formation and grading control method and formation and grading control system | |
| CN111725557A (en) | Activation method of lithium manganate battery | |
| CN111755764A (en) | Method for reducing polarization of lithium battery | |
| CN110911767A (en) | Formation method of lithium ion battery with composite anode | |
| CN112186260A (en) | Formation method of lithium ion battery | |
| CN111430786A (en) | Pre-activation method of lithium ion battery before use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |