CN118054492A - Charging control method and device, readable storage medium and vehicle - Google Patents
Charging control method and device, readable storage medium and vehicle Download PDFInfo
- Publication number
- CN118054492A CN118054492A CN202211399821.8A CN202211399821A CN118054492A CN 118054492 A CN118054492 A CN 118054492A CN 202211399821 A CN202211399821 A CN 202211399821A CN 118054492 A CN118054492 A CN 118054492A
- Authority
- CN
- China
- Prior art keywords
- current
- battery
- threshold
- voltage
- charging
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 103
- 230000008569 process Effects 0.000 claims abstract description 60
- 230000009467 reduction Effects 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present disclosure relates to a charge control method, apparatus, readable storage medium, and vehicle, the method including: in the process of charging the battery, periodically acquiring the highest single voltage of the battery; before the highest single voltage of the battery reaches a first voltage threshold for the first time in the charging process, controlling the battery to be charged with a current larger than or equal to the first current threshold; and when the highest single voltage of the battery is larger than or equal to a first voltage threshold, controlling to reduce the charging current of the battery by a single current-reducing amplitude value under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is larger than or equal to a second current threshold until the battery is charged by the second current threshold under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is smaller than the second current threshold, wherein the second current threshold is smaller than the first current threshold. Through the technical scheme, the charging current of the battery is gradually reduced, the charging speed of the battery can be increased, and the battery endurance can be ensured.
Description
Technical Field
The present disclosure relates to the field of batteries, and in particular, to a charging control method, a device, a readable storage medium, and a vehicle.
Background
The battery is widely applied to the fields of consumer electronics, energy storage, power and the like as equipment capable of storing electric energy, and brings great convenience to life of people. In the process of using mobile equipment such as mobile phones, notebook computers and electric vehicles, the faster the charging speed is, the stronger the cruising ability is, the better the use experience can be brought to the user. Therefore, how to increase the charging speed of the battery is a great concern for the developer.
Disclosure of Invention
An object of the present disclosure is to provide a charge control method, a device, a readable storage medium, and a vehicle, which are capable of improving a charge speed of a battery while "charging up" the battery.
In order to achieve the above object, the present disclosure provides a charge control method including:
In the process of charging a battery, periodically acquiring the highest single voltage of the battery;
Before the highest single voltage of the battery reaches a first voltage threshold for the first time in the charging process, controlling the battery to be charged with a current larger than or equal to a first current threshold;
And when the highest single voltage of the battery is larger than or equal to the first voltage threshold, controlling to reduce the charging current of the battery by a single current-reducing amplitude value under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is larger than or equal to a second current threshold until the battery is charged by the second current threshold under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is smaller than the second current threshold, wherein the second current threshold is smaller than the first current threshold.
Optionally, the method further comprises:
Determining the single current reduction amplitude as a preset first current reduction amplitude under the condition that the current charging current of the battery is larger than a preset third current threshold, wherein the third current threshold is smaller than the first current threshold, and the third current threshold is larger than the second current threshold;
And under the condition that the current charging current of the battery is smaller than or equal to the third current threshold value, determining the single current-reducing amplitude as a preset second current-reducing amplitude, wherein the first current-reducing amplitude is larger than the second current-reducing amplitude.
Optionally, the method further comprises:
Periodically acquiring the temperature of the battery;
The first voltage threshold is determined from the acquired temperature.
Optionally, the method further comprises:
Determining a second voltage threshold according to the acquired temperature, wherein the second voltage threshold is smaller than the first voltage threshold;
before the highest single voltage of the battery reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery with a current greater than or equal to the first current threshold, including:
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the current charging process, controlling to charge the battery by a fourth current threshold;
And controlling to charge the battery by the first current threshold before the highest single voltage of the battery is larger than the second voltage threshold and the first voltage threshold is reached in the current charging process, wherein the fourth current threshold is larger than the first current threshold.
Optionally, the method further comprises:
periodically acquiring the SOC of the battery;
determining a fifth current threshold from the obtained SOC and the obtained temperature;
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the current charging process, controlling to charge the battery with a fourth current threshold, including: controlling to charge the battery with the smaller one of the fourth current threshold and the fifth current threshold before the highest cell voltage of the battery reaches the second voltage threshold for the first time in the current charging process;
And before the highest single voltage of the battery is greater than the second voltage threshold and reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery by the first current threshold, including: and controlling to charge the battery with the smaller one of the first current threshold and the fifth current threshold before the highest cell voltage of the battery is larger than the second voltage threshold and the first voltage threshold is reached in the current charging process.
Optionally, the determining the fifth current threshold according to the acquired SOC and the acquired temperature includes:
A charging current threshold value corresponding to both the acquired SOC and the acquired temperature in a predetermined correspondence relationship including a correspondence relationship between the SOC of the battery, the temperature of the battery, and the charging current threshold value is determined as the fifth current threshold value.
Optionally, the method further comprises:
and stopping charging the battery when the highest cell voltage of the battery is greater than a third voltage threshold.
The present disclosure also provides a charge control device including:
The first acquisition module is configured to periodically acquire the highest single voltage of the battery in the process of charging the battery;
the first control module is configured to control the battery to be charged with a current greater than or equal to a first current threshold before the highest single voltage of the battery reaches the first voltage threshold for the first time in the current charging process;
And a second control module configured to control to reduce the charging current of the battery by a single-drop amplitude value when a difference between a current charging current of the battery and the single-drop amplitude value is equal to or greater than a second current threshold value each time the highest cell voltage of the battery is equal to or greater than the first voltage threshold value, until the battery is controlled to be charged by the second current threshold value when the difference between the current charging current of the battery and the single-drop amplitude value is less than the second current threshold value, wherein the second current threshold value is smaller than the first current threshold value.
The present disclosure also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the charge control method described above.
The present disclosure also provides a vehicle including a controller configured to perform the above-described charge control method.
According to the technical scheme, in the process of charging the battery, when the highest single voltage of the battery reaches the first voltage threshold, the charging current of the battery is controlled to be reduced by a single current reduction amplitude value until the charging current of the battery is reduced to the second current threshold. Therefore, the charging current of the battery is gradually reduced, the charging speed of the battery can be increased, the battery can be fully charged, the battery endurance is ensured, and the use experience of a user is improved. And in the current charging process of the battery, before the highest single voltage of the battery reaches the first voltage threshold for the first time, the battery is controlled to be charged by the current larger than or equal to the first current threshold, so that the battery can be charged quickly, the electric energy stored in the battery is rapidly increased, the charging time is shortened, and the use experience of a user is further improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
Fig. 1 is a flowchart of a charge control method according to an exemplary embodiment of the present disclosure.
Fig. 2 is a flowchart of a charge control method according to an exemplary embodiment of the present disclosure.
Fig. 3 is a block diagram of a charge control device according to an exemplary embodiment of the present disclosure.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
Fig. 1 is a flowchart of a charge control method according to an exemplary embodiment of the present disclosure. As shown in fig. 1, the charge control method includes steps S101 to S103.
In step S101, the highest cell voltage of the battery is periodically acquired during the battery charging process.
The highest cell voltage is the voltage of the cell with the highest voltage among the power cells. For example, if the power battery is formed by connecting 100 unit batteries in series, the highest voltage unit battery of the 100 unit batteries is 3.48V, and the highest unit voltage is 3.48V.
In step S102, before the highest cell voltage of the battery reaches the first voltage threshold for the first time in the current charging process, the battery is controlled to be charged with a current greater than or equal to the first current threshold.
The first voltage threshold may be preset, and when the highest cell voltage of the battery reaches the first voltage threshold, the State of charge (SOC) of the battery may be considered to have reached a higher level. For example, the average value of the voltages of the individual battery cells when the state of charge of the battery reaches 95% may be set as the first voltage threshold. For another example, the average value of the voltages of the individual battery cells when the state of charge of the battery reaches 98% may be set as the first voltage threshold.
The first current threshold may be preset, and when the battery is charged with a current equal to or greater than the first current threshold, the charging current of the battery may be considered to be large, and the electric energy stored in the battery is rapidly increasing. For example, a charging current corresponding to a charge/discharge rate of 0.8C of the battery may be used as the first current threshold. For example, for a battery having a capacity of 180Ah, 144A may be the first current threshold. (180 x 0.8=144)
For example, if the preset first voltage threshold is 3.55V, the preset first current threshold is 144A. In the process carried out in step S102, during the battery charging process, the battery is controlled to be charged at 150A before the highest cell voltage of the battery reaches 3.55V for the first time.
In step S103, when the highest cell voltage of the battery is equal to or greater than the first voltage threshold, if the difference between the current charging current of the battery and the single current reduction value is equal to or greater than a second current threshold, controlling to reduce the charging current of the battery by the single current reduction value until, if the difference between the current charging current of the battery and the single current reduction value is less than the second current threshold, controlling to charge the battery by the second current threshold, wherein the second current threshold is less than the first current threshold.
The single step-down amplitude is the amplitude by which the charging current is reduced each time the charging current of the battery is reduced. For example, if the charging current of the battery 80A decreases the charging current of the battery by a single step-down magnitude (5A), the charging current of the battery is reduced to 75A.
The second current threshold may be preset, for example, the second current threshold may be preset to 40A. In the process of charging the battery, the battery generates a polarized voltage due to the charging current, so that when the battery is charged to a charging cut-off voltage and stops charging, the battery is not fully charged, and the capacity of the battery is lost. The magnitude of the "polarization voltage" produced by the battery is related to the characteristics of the battery itself and the magnitude of the charging current. The greater the charge current of the battery, the greater the "polarization voltage" of the battery. The second current threshold may be preset according to the battery characteristics, so that when the battery is charged with the second current threshold, the "capacity loss" caused by the existence of the battery "polarization voltage" is less.
The process carried out in step S103 is exemplified below. For example, the predetermined first voltage threshold is 3.55V. During the process of charging the battery, as the electric energy stored in the battery increases, the voltage of each single battery in the battery increases gradually. Before the highest cell voltage of the battery reaches 3.55V (first voltage threshold) for the first time, the charging current of the battery can be controlled to be 150A; when the highest single voltage of the battery reaches 3.55V for the first time, the charging current of the battery can be reduced by a single current reduction value (such as 20A), and the charging current of the battery is controlled to be 130A. After the charging current of the battery decreases, the highest cell voltage of the battery decreases below the first voltage threshold (3.55V) due to the external characteristics of the battery. During charging of the battery with the reduced charging current (130A), the voltage of each cell in the battery continues to gradually increase as the stored electrical energy in the battery continues to increase. When the highest cell voltage of the battery reaches the first voltage threshold again, the charging current of the battery is controlled to be reduced by a single step-down amplitude again so as to charge the battery by the reduced charging current again (the charging current of the battery is reduced from 130A to 110A). After the charging current of the battery decreases again, the highest cell voltage of the battery also decreases again due to the external characteristics of the battery, and as the electric energy stored in the battery increases gradually, the highest cell voltage of the battery increases gradually. When the highest cell voltage of the battery reaches the first voltage threshold again, the charging current of the battery can be controlled to be reduced by a single reduced amplitude again. That is, each time the highest cell voltage of the battery is equal to or greater than the first voltage threshold, in the case where the difference between the present charge current of the battery and the single-drop amplitude is greater than the second current threshold, the charge current of the battery is controlled to be reduced by the single-drop amplitude. And controlling to charge the battery at the second current threshold value until the difference between the current charging current of the battery and the single-time current-reducing amplitude is smaller than the second current threshold value, wherein the charging current of the battery is not reduced any more. For example, if the current charging current of the battery is 50A, the single current-down amplitude is 20A, the first current threshold is 40A, and the difference between the current charging current of the battery and the single current-down is smaller than the second current threshold (the difference between 50A and 20A is smaller than 40A), the charging current of the battery can be controlled to be 40A.
In the process of charging the battery with the second current threshold, if the highest single voltage of the battery reaches the first voltage threshold, the charging current of the battery can not be reduced any more, and the battery is continuously charged with the second current threshold. For example, if the charging current of the battery is 40A (the second current threshold), the charging current of the battery may not be reduced when the highest cell voltage of the battery reaches 3.55V (the first voltage threshold), and the battery may be continuously charged with 40A.
The advantage of adjusting the charging current of the battery according to the highest cell voltage of the battery, compared to adjusting the charging current of the battery according to the SOC of the battery, is that the highest cell voltage of the battery can be measured, and the SOC of the battery is calculated by an algorithm, and the use of the highest cell voltage of the battery to adjust the charging current of the battery avoids the problem of calculation deviation of the SOC of the battery, so that the charging current of the battery can be controlled more accurately. The advantage of adjusting the charging current of the battery according to the highest cell voltage of the battery in terms of shortening the charging time becomes more remarkable as the SOC calculation deviation of the battery becomes larger than adjusting the charging current of the battery according to the SOC of the battery.
According to the technical scheme, in the process of charging the battery, when the highest single voltage of the battery reaches the first voltage threshold, the charging current of the battery is controlled to be reduced by a single current reduction amplitude value until the charging current of the battery is reduced to the second current threshold. Therefore, the charging current of the battery is gradually reduced, the charging speed of the battery can be increased, the battery can be fully charged, the battery endurance is ensured, and the use experience of a user is improved. And in the current charging process of the battery, before the highest single voltage of the battery reaches the first voltage threshold for the first time, the battery is controlled to be charged by the current larger than or equal to the first current threshold, so that the battery can be charged quickly, the electric energy stored in the battery is rapidly increased, the charging time is shortened, and the use experience of a user is further improved.
In yet another embodiment, the method further comprises:
Determining a single current reduction amplitude as a preset first current reduction amplitude under the condition that the current charging current of the battery is larger than a preset third current threshold, wherein the third current threshold is smaller than the first current threshold, and the third current threshold is larger than the second current threshold;
and under the condition that the current charging current of the battery is smaller than or equal to a third current threshold value, determining the single current-reducing amplitude as a preset second current-reducing amplitude, wherein the first current-reducing amplitude is larger than the second current-reducing amplitude.
The third current threshold may be preset. When the third current threshold is preset, the third current threshold may be considered as a watershed of a larger charging current and a smaller charging current. For example, for a battery with a maximum allowable charge current of 180A, the second current threshold may be preset to 90A. When the charging current of the battery is greater than 90A, it can be regarded that the charging current of the battery is large; when the charging current of the battery is less than 90A, it can be regarded that the charging current of the battery is small.
The first and second down-flow magnitudes may be preset. For example, the first down-flow amplitude may be preset to 20A and the second down-flow amplitude may be preset to 5A. When the present charge-to-charge current of the battery is greater than the third current threshold, the single-drop magnitude may be determined as the first drop magnitude. When the present charge current of the battery is less than the third current threshold, the single step-down magnitude may be determined as the second step-down magnitude.
For example, if the present charging current of the battery is 120A (greater than the third current threshold 90A), the single step-down amplitude may be determined to be 20A (the first step-down amplitude is 20A), and in the case that the highest cell voltage of the battery reaches 3.55V (the first voltage threshold), the charging current of the battery is controlled to be reduced by 20A. If the current charging current of the battery is 60A (less than the third current threshold 90A), the single-step-down amplitude may be determined to be 5A (the second step-down amplitude is 5A), and if the highest cell voltage of the battery reaches 3.55V (the first voltage threshold), the charging current of the battery is controlled to be reduced by 5A.
In the process of charging the battery, the charging current is reduced for a plurality of times until the battery is charged by the second current threshold value under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is smaller than the second current threshold value, and the charging current of the battery is not reduced any more. For example, if the current charging current of the battery is 40A after several times of current reduction, the single current reduction amplitude is 5A (since the current charging current is 40A and is lower than the third current threshold, the single current reduction amplitude is determined as the second current reduction amplitude 5A), the first current threshold is 40A, the difference between the current charging current of the battery and the single current reduction is smaller than the second current threshold (the difference between 40A and 5A is smaller than 40A), and the charging current of the battery can be controlled to be 40A.
In this embodiment, the single current-reducing amplitude is determined according to the current charging current of the battery, so that when the current is reduced under the condition that the charging current is lower than the second current threshold value, the current can be reduced in a lower current-reducing amplitude, the charging current of the battery is prevented from being reduced rapidly, the charging current of the battery is maintained at a higher level, the charging speed of the battery is increased while the charging capacity of the battery is ensured, and the charging duration is further shortened.
In yet another embodiment, the method further comprises:
Periodically acquiring the temperature of the battery;
A first voltage threshold is determined based on the acquired temperature.
The first voltage threshold corresponding to the different temperatures may be preset. For example, the first voltage threshold corresponding to the temperature of the battery greater than 0 ℃ may be predetermined to be 3.55V, and the first voltage threshold corresponding to 0 ℃ or less may be predetermined to be 3.54V. In the process of the embodiment, the temperature of the battery may be periodically obtained, for example, the current temperature of the battery is obtained to be 25 ℃. If the predetermined first voltage threshold corresponding to the temperature of the battery being 25 deg.c is 3.55V, the first voltage threshold may be determined to be 3.55V according to the acquired temperature (25 deg.c). In this embodiment, the first voltage threshold may be determined according to the temperature of the battery, and for the case where the temperature of the battery is high (for example, greater than 0 ℃), the high first voltage threshold is determined, so that the time when the battery reduces the charging current is delayed, and the charging time of the battery is shortened.
In yet another embodiment, the method further comprises:
Determining a second voltage threshold according to the acquired temperature, wherein the second voltage threshold is smaller than the first voltage threshold;
before the highest single voltage of the battery reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery with a current greater than or equal to the first current threshold, including:
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the charging process, controlling to charge the battery by a fourth current threshold;
And controlling to charge the battery by a first current threshold before the highest single voltage of the battery is larger than a second voltage threshold and the first voltage threshold is reached in the current charging process, wherein the fourth current threshold is larger than the first current threshold.
The second voltage threshold may be determined by temperature. For example, the second voltage threshold of the battery corresponding to the battery temperature being greater than 0 ℃ may be preset to 3.52V, and the second voltage threshold of the battery corresponding to the battery temperature being less than 0 ℃ may be preset to 3.51V. During the battery charging process, the temperature of the battery is periodically acquired, and the second voltage threshold is determined according to the acquired temperature of the battery, for example, if the temperature of the battery is 25 ℃, the second voltage threshold of the battery is determined to be 3.52V (the preset second voltage threshold of the battery corresponding to the temperature of the battery being greater than 0 ℃ is 3.52V).
The fourth current threshold may be determined based on the SOC of the battery and the temperature of the battery. The maximum allowable charging current of the battery at the present SOC and the present temperature may be used as the fourth current threshold, so that the battery charging speed is high when the battery is charged with a charging current equal to the fourth current threshold. For example, if the maximum allowable charge current of the battery at the present SOC and the present temperature is 180A, the fourth current threshold may be set to 180A.
During the charging of the battery, the highest cell voltage of the battery gradually increases from the time when the battery starts to charge (e.g., gradually increases from 3.40V). If the temperature of the battery is 25 ℃, the second voltage threshold determined according to the temperature of the battery is 3.52V, and the first voltage threshold determined according to the temperature of the battery is 3.55V. The battery may be charged with a charging current of 180A (fourth current threshold) before the highest cell voltage of the battery gradually increases from 3.40V until the highest cell voltage of the battery reaches 3.52V for the first time (second voltage threshold); the battery may be charged with a charging current of 150A (first current threshold) before the highest cell voltage of the battery gradually increases from 3.52V (second voltage threshold) until reaching 3.55V (first voltage threshold) for the first time. Therefore, the charging speed of the battery can be improved, the total capacity of the charged battery is prevented from being greatly reduced when the charging is completed, the battery endurance is ensured, and the user experience is improved.
In yet another embodiment, the method further comprises:
periodically acquiring the SOC of the battery;
determining a fifth current threshold from the obtained SOC and the obtained temperature;
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the current charging process, controlling to charge the battery with a fourth current threshold, including: controlling to charge the battery with the smaller one of the fourth current threshold and the fifth current threshold before the highest cell voltage of the battery reaches the second voltage threshold for the first time in the current charging process;
And before the highest single voltage of the battery is greater than the second voltage threshold and reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery by the first current threshold, including: and controlling to charge the battery with the smaller one of the first current threshold and the fifth current threshold before the highest cell voltage of the battery is larger than the second voltage threshold and the first voltage threshold is reached in the current charging process.
The fifth current threshold value corresponding to the SOC of the battery and the temperature of the battery may be set in advance according to the characteristics of the battery. The fifth current threshold may be a maximum allowable charge current corresponding to a current SOC of the battery and a current temperature of the battery without damaging the battery.
For example, before the highest cell voltage of the battery reaches the second voltage threshold for the first time in the current charging process, if the fourth current threshold is less than or equal to the fifth current threshold, controlling to charge the battery with the fourth current threshold; and if the fourth current threshold is greater than the fifth current threshold, controlling to charge the battery at the fifth current threshold. As the charging process proceeds, the highest cell voltage of the battery gradually increases. If the highest single voltage of the battery is larger than the second voltage threshold and before the first voltage threshold is reached in the current charging process, the battery is controlled to be charged by the first current threshold if the first current threshold is smaller than or equal to the fifth current threshold; and if the first current threshold is greater than the fifth current threshold, controlling to charge the battery at the fifth current threshold.
For example, a fifth current threshold value of 180A corresponding to a battery temperature of 20 ℃ to 25 ℃ and a battery SOC of 0% to 90% may be preset; the fifth current threshold corresponding to the battery temperature in the range of 20-25 ℃ and the battery SOC in the range of 90-100% is 150A.
For example, the fifth current threshold value corresponding to the battery temperature in the range of 0 ℃ to 2 ℃ and the battery SOC in the range of 0% to 100% may be set to 18A.
In the process of charging the battery, if the temperature of the battery is 23 ℃, and the SOC of the battery is 20%, the fifth current threshold may be determined to be 180A (the preset fifth current threshold corresponding to the temperature of the battery being in the interval of 20 ℃ to 25 ℃ and the SOC of the battery being in the interval of 0% -90%) is 180A).
Before the highest cell voltage of the battery reaches the second voltage threshold (e.g., 3.52V) for the first time in the current charging process, if the fourth current threshold (e.g., 180A) is smaller than or equal to the fifth current threshold (e.g., 180A), the battery is controlled to be charged by the fourth current threshold. If the fourth current threshold (e.g., 180A) is greater than the fifth current threshold (e.g., 150A), then the battery may be controlled to be charged at the fifth current threshold.
And if the first current threshold (e.g. 150A) is less than or equal to the fifth current threshold (e.g. 150A), controlling to charge the battery with the first current threshold (e.g. 150A) before the highest cell voltage of the battery is greater than the second voltage threshold (e.g. 3.52V) and the first voltage threshold is reached for the first time in the current charging process (e.g. 3.55V). If the first current threshold (e.g., 150A) is greater than the fifth current threshold (e.g., 140A), then the battery may be controlled to be charged at the fifth current threshold.
In this embodiment, during the process of charging the battery, the charging current of the battery may be controlled not to exceed the fifth current threshold determined according to the temperature of the battery and the SOC of the battery, so as to avoid damage to the battery and prolong the service life of the battery.
In yet another embodiment, determining the fifth current threshold from the obtained SOC and the obtained temperature includes:
A charging current threshold value corresponding to both the acquired SOC and the acquired temperature in a predetermined correspondence relationship including a correspondence relationship between the SOC of the battery, the temperature of the battery, and the charging current threshold value is determined as a fifth current threshold value.
The charge current threshold is the maximum allowable charge current of the battery at a certain temperature and a certain SOC. The charging current threshold may be preset according to the battery characteristics. For example, it may be preset that the charging current threshold value corresponding to the battery temperature in the range of 20 ℃ to 25 ℃ and the battery SOC in the range of 0% to 90% in the correspondence relationship is 180A; the charging current threshold corresponding to the battery temperature in the range of 20-25 ℃ and the battery SOC in the range of 90-100% is 150A. For example, the charging current threshold value corresponding to the battery temperature in the range of 0 ℃ to 2 ℃ and the battery SOC in the range of 0% to 100% in the correspondence relationship may be set to 18A.
During battery charging, a charging current threshold corresponding to both the acquired SOC and the acquired temperature in a predetermined correspondence relationship may be found to be determined as a fifth current threshold. In the embodiment, the fifth current threshold can be quickly determined according to the preset corresponding relation, the acquired temperature of the battery and the acquired SOC of the battery, so that the method is simple and the response speed is high.
In yet another embodiment, the method further comprises:
in the case where the highest cell voltage of the battery is greater than the third voltage threshold, charging of the battery is stopped. The third voltage threshold may be preset, for example, the third voltage threshold may be preset to 3.65V. In the process of charging the battery, when the highest single voltage of the battery is greater than 3.65V (third voltage threshold), the battery can be stopped from being charged, the overcharge of the battery is avoided, the safety of the charging process is improved, and the service life of the battery is prolonged.
Fig. 2 is a flowchart of a charge control method according to an exemplary embodiment of the present disclosure. As shown in fig. 2, the charge control method includes the steps of:
(1) Charging the battery with a fourth current threshold before the highest cell voltage of the battery reaches the second voltage threshold for the first time;
(2) Charging the battery with a first current threshold after the highest cell voltage of the battery reaches the second voltage threshold for the first time and before the highest cell voltage of the battery reaches the first voltage threshold for the first time;
(3) Judging whether the current charging current of the battery is greater than a third current threshold value or not every time the highest single voltage of the battery is greater than a first voltage threshold value; if the current charging current of the battery is larger than a third current threshold value, determining the single current-reducing amplitude value as a first current-reducing amplitude value; if the current charging current of the battery is not greater than the third current threshold value, determining the single current-reducing amplitude value as a second current-reducing amplitude value;
(4) Controlling the charging current of the battery to reduce the single current-falling amplitude under the condition that the difference between the current charging current of the battery and the single current-falling amplitude is larger than or equal to a second current threshold;
(5) And under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude is smaller than a second current threshold, charging the battery by taking the second current threshold as the battery until the highest single voltage of the battery reaches a third voltage threshold.
During the execution of steps (1) to (2), the charging current of the battery may also be controlled not to exceed the fifth current threshold. If at some point during the performance of step (1) the fourth current threshold is greater than the fifth current threshold, the battery may be charged with the fifth current threshold and subsequent steps may continue. If the first current threshold is greater than the fifth current threshold during performance of step (2), the battery may be controlled to be charged at the fifth current threshold.
Fig. 3 is a block diagram of a charge control device according to an exemplary embodiment of the present disclosure. As shown in fig. 3, the charge control device 200 includes a first acquisition module 201, a first control module 202, and a second control module 203.
The first acquisition module 201 is configured to periodically acquire the highest cell voltage of the battery during charging of the battery.
The first control module 202 is configured to control charging of the battery with a current equal to or greater than a first current threshold before a highest cell voltage of the battery reaches the first voltage threshold for the first time during the present charging.
The second control module 203 is configured to control to decrease the charging current of the battery by a single step-down amplitude value when a difference between a present charging current of the battery and the single step-down amplitude value is equal to or greater than a second current threshold value each time the highest cell voltage of the battery is equal to or greater than the first voltage threshold value, until the battery is controlled to be charged by the second current threshold value when the difference between the present charging current of the battery and the single step-down amplitude value is less than the second current threshold value, wherein the second current threshold value is smaller than the first current threshold value.
In yet another embodiment, the charging control device 200 further includes a first determination module and a second determination module.
The first determining module is configured to determine the single step-down magnitude as a preset first step-down magnitude if a present charging current of the battery is greater than a preset third current threshold, wherein the third current threshold is smaller than the first current threshold and the third current threshold is greater than the second current threshold.
The second determining module is configured to determine the single current-reducing amplitude as a preset second current-reducing amplitude when the present charging current of the battery is less than or equal to the third current threshold, wherein the first current-reducing amplitude is greater than the second current-reducing amplitude.
In yet another embodiment, the charging control device 200 further includes a second acquisition module and a third determination module.
The second acquisition module is configured to periodically acquire a temperature of the battery.
The third determination module is configured to determine a first voltage threshold based on the acquired temperature.
In yet another embodiment, the charging control device 200 further includes a fourth determination module.
The fourth determination module is configured to determine a second voltage threshold from the acquired temperature, wherein the second voltage threshold is less than the first voltage threshold.
The first control module 202 includes a first control sub-module and a second control sub-module.
The first control sub-module is configured to control charging of the battery with a fourth current threshold before a highest cell voltage of the battery reaches the second voltage threshold for the first time during the present charging process.
The second control sub-module is configured to control to charge the battery with the first current threshold before the highest cell voltage of the battery is greater than the second voltage threshold and the first voltage threshold is reached for the first time in the current charging process, wherein the fourth current threshold is greater than the first current threshold.
In yet another embodiment, the charging control device 200 further includes a third acquisition module and a fifth determination module.
The third acquisition module is configured to periodically acquire the SOC of the battery.
The fifth determination module is configured to determine a fifth current threshold based on the obtained SOC and the obtained temperature.
The first control sub-module is further configured to control charging of the battery with the smaller of the fourth current threshold and the fifth current threshold before the highest cell voltage of the battery reaches the second voltage threshold for the first time during the present charging.
The second control sub-module is further configured to control charging of the battery with the smaller of the first current threshold and the fifth current threshold before the highest cell voltage of the battery is greater than the second voltage threshold and the first voltage threshold is reached for the first time during the present charging.
In yet another embodiment, the fifth determining module is further configured to determine a charging current threshold value corresponding to both the acquired SOC and the acquired temperature in a predetermined correspondence relationship as the fifth current threshold value, wherein the predetermined correspondence relationship includes a correspondence relationship between the SOC of the battery, the temperature of the battery, and the charging current threshold value.
In yet another embodiment, the charging control device 200 further includes a third control module.
The third control module is configured to stop charging the battery if the highest cell voltage of the battery is greater than a third voltage threshold.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
According to the technical scheme, in the process of charging the battery, when the highest single voltage of the battery reaches the first voltage threshold, the charging current of the battery is controlled to be reduced by a single current reduction amplitude value until the charging current of the battery is reduced to the second current threshold. Therefore, the charging current of the battery is gradually reduced, the charging speed of the battery can be increased, the battery can be fully charged, the battery endurance is ensured, and the use experience of a user is improved. And in the current charging process of the battery, before the highest single voltage of the battery reaches the first voltage threshold for the first time, the battery is controlled to be charged by the current larger than or equal to the first current threshold, so that the battery can be charged quickly, the electric energy stored in the battery is rapidly increased, the charging time is shortened, and the use experience of a user is further improved.
The present disclosure also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the charge control method described above.
The present disclosure also provides a vehicle including a controller configured to perform the above-described charge control method.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations are not described further in this disclosure in order to avoid unnecessary repetition.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. A charging control method, characterized by comprising:
In the process of charging a battery, periodically acquiring the highest single voltage of the battery;
Before the highest single voltage of the battery reaches a first voltage threshold for the first time in the charging process, controlling the battery to be charged with a current larger than or equal to a first current threshold;
And when the highest single voltage of the battery is larger than or equal to the first voltage threshold, controlling to reduce the charging current of the battery by a single current-reducing amplitude value under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is larger than or equal to a second current threshold until the battery is charged by the second current threshold under the condition that the difference between the current charging current of the battery and the single current-reducing amplitude value is smaller than the second current threshold, wherein the second current threshold is smaller than the first current threshold.
2. The method according to claim 1, wherein the method further comprises:
Determining the single current reduction amplitude as a preset first current reduction amplitude under the condition that the current charging current of the battery is larger than a preset third current threshold, wherein the third current threshold is smaller than the first current threshold, and the third current threshold is larger than the second current threshold;
And under the condition that the current charging current of the battery is smaller than or equal to the third current threshold value, determining the single current-reducing amplitude as a preset second current-reducing amplitude, wherein the first current-reducing amplitude is larger than the second current-reducing amplitude.
3. The method according to claim 1, wherein the method further comprises:
Periodically acquiring the temperature of the battery;
The first voltage threshold is determined from the acquired temperature.
4. A method according to claim 3, characterized in that the method further comprises:
Determining a second voltage threshold according to the acquired temperature, wherein the second voltage threshold is smaller than the first voltage threshold;
before the highest single voltage of the battery reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery with a current greater than or equal to the first current threshold, including:
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the current charging process, controlling to charge the battery by a fourth current threshold;
And controlling to charge the battery by the first current threshold before the highest single voltage of the battery is larger than the second voltage threshold and the first voltage threshold is reached in the current charging process, wherein the fourth current threshold is larger than the first current threshold.
5. The method according to claim 4, wherein the method further comprises:
periodically acquiring the SOC of the battery;
determining a fifth current threshold from the obtained SOC and the obtained temperature;
Before the highest single voltage of the battery reaches the second voltage threshold for the first time in the current charging process, controlling to charge the battery with a fourth current threshold, including: controlling to charge the battery with the smaller one of the fourth current threshold and the fifth current threshold before the highest cell voltage of the battery reaches the second voltage threshold for the first time in the current charging process;
And before the highest single voltage of the battery is greater than the second voltage threshold and reaches the first voltage threshold for the first time in the current charging process, controlling to charge the battery by the first current threshold, including: and controlling to charge the battery with the smaller one of the first current threshold and the fifth current threshold before the highest cell voltage of the battery is larger than the second voltage threshold and the first voltage threshold is reached in the current charging process.
6. The method of claim 5, wherein determining a fifth current threshold from the obtained SOC and the obtained temperature comprises:
A charging current threshold value corresponding to both the acquired SOC and the acquired temperature in a predetermined correspondence relationship including a correspondence relationship between the SOC of the battery, the temperature of the battery, and the charging current threshold value is determined as the fifth current threshold value.
7. The method according to claim 1, wherein the method further comprises:
and stopping charging the battery when the highest cell voltage of the battery is greater than a third voltage threshold.
8. A charge control device, characterized by comprising:
The first acquisition module is configured to periodically acquire the highest single voltage of the battery in the process of charging the battery;
the first control module is configured to control the battery to be charged with a current greater than or equal to a first current threshold before the highest single voltage of the battery reaches the first voltage threshold for the first time in the current charging process;
And a second control module configured to control to reduce the charging current of the battery by a single-drop amplitude value when a difference between a current charging current of the battery and the single-drop amplitude value is equal to or greater than a second current threshold value each time the highest cell voltage of the battery is equal to or greater than the first voltage threshold value, until the battery is controlled to be charged by the second current threshold value when the difference between the current charging current of the battery and the single-drop amplitude value is less than the second current threshold value, wherein the second current threshold value is smaller than the first current threshold value.
9. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the steps of the charge control method of any of claims 1-7.
10. A vehicle characterized by comprising a controller configured to execute the charge control method of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399821.8A CN118054492A (en) | 2022-11-09 | 2022-11-09 | Charging control method and device, readable storage medium and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399821.8A CN118054492A (en) | 2022-11-09 | 2022-11-09 | Charging control method and device, readable storage medium and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118054492A true CN118054492A (en) | 2024-05-17 |
Family
ID=91043583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211399821.8A Pending CN118054492A (en) | 2022-11-09 | 2022-11-09 | Charging control method and device, readable storage medium and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118054492A (en) |
-
2022
- 2022-11-09 CN CN202211399821.8A patent/CN118054492A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110679056B (en) | Battery charge management apparatus and method | |
| JP4966998B2 (en) | Charge control circuit, battery pack, and charging system | |
| EP2672606B1 (en) | Charging-control device and charging-control method | |
| EP3678277B1 (en) | Quick charging method for battery, charging device, device to be charged and charging system | |
| JP2011004509A5 (en) | ||
| EP3982507A1 (en) | Device and method for balancing battery packs connected in parallel to each other | |
| US20110267007A1 (en) | Discharge method for a battery pack | |
| JP5122214B2 (en) | Battery pack, charging device, and charging system | |
| KR20190074123A (en) | Method and apparatus for battery charging | |
| EP3672016B1 (en) | Charging management circuit, terminal and charging method | |
| KR102350281B1 (en) | A method of charging a lithium-ion battery with user, cell and temperature awareness | |
| US10536020B2 (en) | Charging control apparatus, charging control method and computer readable medium thereof | |
| EP4016698A1 (en) | Apparatus and method for controlling operation of secondary battery by using relative degree of aging of electrode | |
| CN112193124B (en) | Battery charging method, device, medium, battery management system and vehicle | |
| WO2019230131A1 (en) | Charge control device, transport device, and program | |
| CN111301219A (en) | Electric vehicle battery control method, system, device and readable storage medium | |
| KR20210047816A (en) | Balancing Apparatus for Parallel-Connected Battery Pack and Method thereof | |
| CN114142112A (en) | Control method, device, equipment and storage medium of battery system | |
| CN113241809A (en) | Variable current intermittent pulse rapid charging control method and device based on electric model | |
| CN113875117A (en) | Battery management system and operation of an electric energy accumulator | |
| CN118054492A (en) | Charging control method and device, readable storage medium and vehicle | |
| CN113650527B (en) | Power battery voltage equalization method, device, equipment and storage medium | |
| CN113839439B (en) | Full-period battery pack balance control method, device and storage medium | |
| US20220200067A1 (en) | Battery control device and mobile battery | |
| KR102455631B1 (en) | Method and apparatus of charging battery |
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 |