Battery protection method, device, apparatus and storage medium

Abstract

The application discloses a battery protection method, device, equipment and storage medium, the method comprises the following steps: in the process of vehicle driving, in response to the charging voltage of the vehicle battery being greater than any preset pre-overvoltage trigger threshold, entering the corresponding battery pre-overvoltage protection mode to reduce the charging voltage; in response to the charging voltage being reduced to below the preset pre-overvoltage exit threshold, exiting the corresponding battery pre-overvoltage protection mode; the pre-overvoltage trigger threshold comprises a plurality of pre-overvoltage trigger thresholds, each pre-overvoltage trigger threshold is provided with a battery pre-overvoltage protection mode and a pre-overvoltage exit threshold, each pre-overvoltage trigger threshold is greater than the corresponding pre-overvoltage exit threshold, the plurality of pre-overvoltage trigger thresholds is less than or equal to the battery full charge cut-off voltage, and the battery pre-overvoltage protection mode corresponding to different pre-overvoltage trigger thresholds is different. By setting the pre-overvoltage protection, the battery overcharge can be prevented, and the safety of the battery and the user vehicle safety can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery protection, and in particular to a battery protection method, device, equipment and storage medium. BACKGROUND

[0002] In the management of power batteries of electric vehicles, overvoltage protection is an important measure to ensure the safety of battery packs. In the traditional method, once the vehicle generates serious overvoltage during use, the overvoltage protection is triggered, and the vehicle will be directly powered off, which not only interrupts the power of the vehicle and brings safety risks, but also may cause the battery pack to be replaced due to serious overvoltage failure, resulting in high maintenance costs.

[0003] Therefore, how to effectively prevent battery overcharging and protect the safety of the battery and the safety of the user in driving the vehicle is a technical problem to be solved at present. SUMMARY

[0004] In view of the above problems, the present application provides a battery protection method, device, equipment and storage medium which can overcome the above problems or at least partially solve the above problems. By setting a pre-overvoltage protection, the battery triggers the overvoltage protection, so as to effectively prevent the battery from overcharging and protect the safety of the battery and the safety of the user in driving the vehicle.

[0005] In a first aspect, a battery protection method is provided, comprising:

[0006] During the driving of the vehicle, in response to the charging voltage of the battery of the vehicle being greater than any pre-overvoltage trigger threshold, entering a corresponding battery pre-overvoltage protection mode to reduce the charging voltage;

[0007] In response to the charging voltage being reduced to below a pre-overvoltage exit threshold, exiting the corresponding battery pre-overvoltage protection mode;

[0008] The pre-overvoltage trigger threshold includes a plurality of pre-overvoltage trigger thresholds, each pre-overvoltage trigger threshold is provided with a battery pre-overvoltage protection mode and a pre-overvoltage exit threshold, each pre-overvoltage trigger threshold is greater than the corresponding pre-overvoltage exit threshold, and a plurality of pre-overvoltage trigger thresholds are less than or equal to the full charging cut-off voltage of the battery. The battery pre-overvoltage protection mode corresponding to different pre-overvoltage trigger thresholds is different.

[0009] In some implementations, the entering of the corresponding battery pre-overvoltage protection mode comprises:

[0010] Obtaining the maximum allowable recharging power of the battery at present;

[0011] determining a charging power limit value based on the maximum allowed charging power and a preset charging power limit coefficient, and limiting the charging power of the battery to be below the charging power limit value.

[0012] In some implementations, the obtaining the current maximum allowed charging power of the battery comprises:

[0013] obtaining a current state parameter of the battery, the state parameter comprising at least a battery SOC and a battery temperature;

[0014] determining the corresponding maximum allowed charging power under the current state parameter of the battery based on a preset mapping relationship between the state parameter and the maximum allowed charging power.

[0015] In some implementations, each of the battery pre-overvoltage protection modes corresponds to a charging power limit coefficient, and the greater the pre-overvoltage trigger threshold corresponding to the battery pre-overvoltage protection mode, the smaller the charging power limit coefficient corresponding to the battery pre-overvoltage protection mode.

[0016] In some implementations, the entering the corresponding battery pre-overvoltage protection mode further comprises:

[0017] limiting a power change rate of the battery during charging to be less than or equal to a preset limit rate.

[0018] In some implementations, the method further comprises:

[0019] in response to the charging voltage of the vehicle battery being greater than any preset overvoltage trigger threshold, entering a corresponding overvoltage protection mode;

[0020] wherein the overvoltage trigger threshold comprises a plurality of overvoltage trigger thresholds, each of the overvoltage trigger thresholds being greater than the pre-overvoltage trigger threshold, each of the overvoltage trigger thresholds corresponding to a preset overvoltage protection mode, and different overvoltage trigger thresholds corresponding to different overvoltage protection modes.

[0021] The overvoltage protection mode comprises limiting the charging power of the battery, or controlling the vehicle to enter a limp-home mode, or controlling the vehicle to directly power off.

[0022] In some implementations, the method further comprises:

[0023] in response to the charging voltage of the vehicle battery being greater than any preset pre-overvoltage trigger threshold and the duration reaching a preset trigger time, entering a corresponding battery pre-overvoltage protection mode;

[0024] in response to the charging voltage being reduced to below a preset pre-overvoltage exit threshold within a preset recovery time, exiting the corresponding battery pre-overvoltage protection mode.

[0025] In a second aspect, a battery protection apparatus is provided, comprising:

[0026] a pre-overvoltage protection module configured to, in response to a charging voltage of a battery of a vehicle being greater than any pre-overvoltage trigger threshold, enter a corresponding battery pre-overvoltage protection mode to reduce the charging voltage during driving of the vehicle;

[0027] a pre-overvoltage exit module configured to, in response to the charging voltage being reduced to below a pre-overvoltage exit threshold, exit the corresponding battery pre-overvoltage protection mode;

[0028] wherein the pre-overvoltage trigger thresholds comprise a plurality, each of the pre-overvoltage trigger thresholds is provided with a corresponding battery pre-overvoltage protection mode and a corresponding pre-overvoltage exit threshold, each of the pre-overvoltage trigger thresholds is greater than the corresponding pre-overvoltage exit threshold, the plurality of pre-overvoltage trigger thresholds are less than or equal to a battery full-charge cutoff voltage, and the battery pre-overvoltage protection modes corresponding to different pre-overvoltage trigger thresholds are different.

[0029] In some implementations, the pre-overvoltage protection module is further configured to:

[0030] obtain a current maximum allowable recharge power of the battery;

[0031] determine a recharge power limit value based on the maximum allowable recharge power and a preset recharge power limit coefficient, and limit the recharge power of the battery to be below the recharge power limit value.

[0032] In some implementations, the pre-overvoltage protection module is further configured to:

[0033] obtain a current state parameter of the battery, the state parameter comprising at least a battery SOC and a battery temperature;

[0034] determine the maximum allowable recharge power corresponding to the current state parameter of the battery based on a pre-labeled mapping relationship between state parameters and maximum allowable recharge powers.

[0035] In some implementations, each of the battery pre-overvoltage protection modes corresponds to a recharge power limit coefficient, and the greater the pre-overvoltage trigger threshold corresponding to the battery pre-overvoltage protection mode, the smaller the recharge power limit coefficient corresponding to the battery pre-overvoltage protection mode.

[0036] In some implementations, the pre-overvoltage protection module is further configured to:

[0037] limit a power change rate during battery recharge to be less than or equal to a preset limit rate.

[0038] In some implementations, the pre-overvoltage protection module is further configured to:

[0039] in response to the battery charging voltage being greater than any pre-overvoltage trigger threshold and the duration reaching a preset trigger time, enter a corresponding battery pre-overvoltage protection mode;

[0040] in response to the charging voltage decreasing to below a preset pre-overvoltage exit threshold within a preset recovery time, exit the corresponding battery pre-overvoltage protection mode.

[0041] In some implementations, the device further comprises an overvoltage protection module configured to:

[0042] in response to the charging voltage of the vehicle battery being greater than any overvoltage trigger threshold, enter a corresponding overvoltage protection mode;

[0043] wherein the overvoltage trigger thresholds include a plurality of overvoltage trigger thresholds, each of the overvoltage trigger thresholds being greater than the pre-overvoltage trigger threshold, each of the overvoltage trigger thresholds corresponding to a set overvoltage protection mode, and different overvoltage trigger thresholds corresponding to different overvoltage protection modes.

[0044] the overvoltage protection mode includes limiting the battery recharge power, or controlling the vehicle to enter a limp-home mode, or directly powering off the vehicle.

[0045] In a third aspect, an electronic device is provided, comprising a memory and a processor, which are communicatively connected, and the memory stores computer instructions, and the processor executes the computer instructions to perform the battery protection method of the first aspect.

[0046] In a fourth aspect, a computer readable storage medium is provided, which stores computer instructions for causing a computer to perform the battery protection method of the first aspect.

[0047] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0048] The battery protection method, device, equipment and storage medium provided by the embodiment of the application can intervene before the battery charging voltage approaches the full charging cutoff voltage by setting a pre-overvoltage triggering threshold (less than or equal to the battery full charging cutoff voltage), enter a corresponding battery pre-overvoltage protection mode, and reduce the charging voltage in time to prevent triggering of the battery overvoltage protection. On the one hand, the safety risk caused by power-off of the vehicle during driving can be effectively prevented, and the driving safety of the user during driving of the vehicle is ensured. On the other hand, the charging voltage is reduced by intervening in protection when the battery voltage shows an overvoltage trend but has not reached a serious overvoltage state. As long as the charging voltage can be reduced to below the pre-overvoltage exit threshold, the protection mode is exited, the battery pack is prevented from being damaged due to serious overvoltage, and the probability of replacement of the battery pack due to overvoltage failure is greatly reduced, thereby significantly reducing the maintenance cost and ensuring the safety of the battery. Meanwhile, the multiple pre-overvoltage triggering thresholds provide a multiple protection mechanism, different protection measures can be taken for different degrees of pre-overvoltage, the problem of over-protection or insufficient protection of pre-overvoltage caused by the one-size-fits-all protection mode is avoided, and the reliability of the method is improved. Each threshold corresponds to a specific pre-overvoltage protection mode, so that the protection strategy is more refined and can more accurately respond to the voltage change in the battery charging process. When the charging voltage changes, the pre-overvoltage protection strategy can be dynamically adjusted according to the real-time state of the battery, thereby avoiding triggering of the battery overvoltage protection.

[0049] The above description is only a summary of the technical scheme of the application. In order to more clearly understand the technical means of the application, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0050] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0051] Figure 1 is a flowchart of a battery protection method provided by the embodiment of the application;

[0052] Figure 2 is a structural block diagram of a battery protection device provided by the embodiment of the application. DETAILED DESCRIPTION

[0053] In order to make the technical scheme and advantages of the present application more clear, the embodiments of the present application are further described in detail below.

[0054] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application and in the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like are to be construed open- ended, meaning that they include the listed steps or elements, but not excluding other not listed steps or elements. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not necessarily limited to only those steps or elements, but can include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

[0055] Since different overvoltage levels have different effects on the battery, the prior art usually sets different overvoltage protection strategies according to different overvoltage levels. Common overvoltage protection strategies usually include limiting the control vehicle to limp, controlling the vehicle to power off, etc.

[0056] The inventor finds that if the battery generates serious overvoltage during the driving of the vehicle, the overvoltage protection is triggered, and the vehicle will be directly powered off, which not only interrupts the power of the vehicle and brings safety risks, but also may cause the battery pack to be replaced due to serious overvoltage failure, resulting in high maintenance costs.

[0057] Therefore, in order to solve the above technical problems, the embodiment of the present application provides a battery protection method, which intervenes before the battery charging voltage approaches the full charge cut-off voltage, enters the corresponding battery pre-overvoltage protection mode, and timely reduces the charging voltage to prevent triggering the battery overvoltage protection, so as to effectively prevent the battery from overcharging and protect the safety of the battery and the user's driving safety.

[0058] It should be noted that the pre-overvoltage protection method provided by the embodiment of the present application is applicable to electric vehicles and hybrid vehicles, and the hybrid vehicle is a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV) and the like. The execution subject of the pre-overvoltage protection method provided by the embodiment of the present application can be a battery management system (BMS) or a vehicle controller.

[0059] Figure 1 is a flowchart of a battery protection method provided by the embodiment of the present application, as shown in Figure 1 The method comprises:

[0060] In step S110, in response to the charging voltage of the vehicle battery being greater than any of preset pre-overvoltage triggering thresholds, a corresponding battery pre-overvoltage protection mode is entered to reduce the charging voltage, the pre-overvoltage triggering thresholds include a plurality of pre-overvoltage triggering thresholds, each pre-overvoltage triggering threshold corresponds to a battery pre-overvoltage protection mode, the plurality of pre-overvoltage triggering thresholds are less than or equal to the battery full-charge cut-off voltage, and the battery pre-overvoltage protection modes corresponding to different pre-overvoltage triggering thresholds are different.

[0061] In an implementation manner, entering the corresponding battery pre-overvoltage protection mode includes:

[0062] Firstly, the maximum allowed regenerative charging power of the battery at present is obtained.

[0063] For example, the state parameters of the battery at present are obtained, the state parameters at least include the battery SOC and the battery temperature; and the maximum allowed regenerative charging power corresponding to the state parameters of the battery at present is determined based on a preset mapping relationship between the state parameters and the maximum allowed regenerative charging power.

[0064] In a specific implementation, the charging power MAP can be obtained through a bench test, and the charging power MAP of the battery can include data of multiple dimensions such as the battery SOC, the battery temperature and the corresponding maximum allowed charging power in advance. In the charging process, the battery management system can monitor the SOC and the temperature of the battery in real time, and determine the maximum allowed charging power at present according to the charging power MAP.

[0065] Secondly, a regenerative charging power limit value is determined based on the maximum allowed regenerative charging power and a preset regenerative charging power limit coefficient, and the regenerative charging power of the battery is limited to be below the regenerative charging power limit value.

[0066] In an implementation manner, the regenerative charging power limit value P0 is the product of the maximum allowed regenerative charging power P and the preset regenerative charging power limit coefficient X, that is, P0 = P * X. max max

[0067] The regenerative charging power of the battery refers to the power of the battery charged by the braking energy recovery system (for example, the electric motor is changed into a generator to convert kinetic energy into electric energy when the vehicle is decelerated or downhill) during the driving of the vehicle. In a specific implementation, the braking energy recovery system can charge the battery in a pulse regenerative manner. The pulse regenerative charging is a specific charging manner, which realizes intermittent charging of the battery by periodically turning on and off the charging current. In the pulse regenerative charging process, the battery receives pulse charging for a period of time, and then enters a resting stage to allow the electrochemical reaction inside the battery to have sufficient time to balance and recover, which helps to reduce the concentration polarization and ohmic polarization phenomena inside the battery, thereby reducing the internal pressure of the battery.

[0068] ​​In an implementation, the pre-overvoltage trigger thresholds include n, and each pre-overvoltage trigger threshold corresponds to a battery pre-overvoltage protection mode. Step S110 includes:

[0069] In response to the charging voltage U of the vehicle battery being greater than the i-th pre-overvoltage trigger threshold U c and less than or equal to the (i+1)-th pre-overvoltage trigger threshold U bi , i.e., U b(i+1) < U bi < U c ≤ U b(i+1) , the i-th pre-overvoltage trigger threshold U bi corresponding battery pre-overvoltage protection mode is entered, and i+1≤n.

[0070] The multiple pre-overvoltage trigger thresholds provide a multiple protection mechanism, which can take different protection measures for different degrees of pre-overvoltage conditions, avoiding the problem of over-protection or insufficient protection that may be caused by a one-size-fits-all protection mode. Moreover, each threshold corresponds to a specific pre-overvoltage protection mode, making the protection strategy more refined and enabling more accurate response to voltage changes during battery charging. When the charging voltage changes, the pre-overvoltage protection strategy can be dynamically adjusted according to the real-time state of the battery, thereby avoiding triggering the battery overvoltage protection.

[0071] In an implementation, each battery pre-overvoltage protection mode corresponds to a recharge power limitation coefficient. The greater the pre-overvoltage trigger threshold corresponding to the battery pre-overvoltage protection mode, the smaller the recharge power limitation coefficient corresponding to the battery pre-overvoltage protection mode. That is, the pre-overvoltage trigger threshold and the corresponding recharge power limitation coefficient are negatively correlated. The smaller the recharge power limitation coefficient, the smaller the corresponding recharge power limitation value, and the battery management system will adjust the charging voltage according to the recharge power limitation value, so that the charging voltage is reduced below the pre-overvoltage exit threshold.

[0072] In an implementation, in step S110, entering the corresponding battery pre-overvoltage protection mode further includes limiting the power change rate during battery recharge to be less than or equal to a set limit rate.

[0073] Limiting the power change rate helps to reduce the thermal stress of the battery during charging, because rapid changes in power can cause a large amount of heat to be generated inside the battery, thereby affecting the battery life. Smooth power changes help to reduce safety hazards caused by sudden changes in current or voltage, such as battery short circuit, overheating, and even explosion.

[0074] In an implementation, step S110 can further include:

[0075] In response to the battery charging voltage being greater than any pre-set pre-overvoltage trigger threshold and the duration reaching a pre-set trigger time, the corresponding battery pre-overvoltage protection mode is entered.

[0076] After adding the trigger time condition, not only the response is made when the voltage exceeds the pre-overvoltage trigger threshold, but also the duration of the overvoltage state is confirmed. This helps to reduce the false triggering of the pre-overvoltage protection mode due to voltage transient fluctuations, thereby improving the accuracy and stability of the pre-overvoltage protection.

[0077] Step S120, in response to the charging voltage being reduced to below the preset pre-overvoltage exit threshold, the corresponding battery pre-overvoltage protection mode is exited, each pre-overvoltage trigger threshold is provided with a pre-overvoltage exit threshold, and each pre-overvoltage trigger threshold is greater than the corresponding pre-overvoltage exit threshold.

[0078] In an implementation manner, the pre-overvoltage trigger threshold includes n, each pre-overvoltage trigger threshold corresponds to a pre-overvoltage exit threshold, and step S120 includes:

[0079] In response to the charging voltage of the vehicle battery being reduced to below the pre-overvoltage exit threshold corresponding to the i-th pre-overvoltage trigger threshold, the battery pre-overvoltage protection mode corresponding to the i-th pre-overvoltage trigger threshold is exited, and i+1≤n.

[0080] In the embodiment, the i+1-th pre-overvoltage trigger threshold U b(i+1) The corresponding pre-overvoltage exit threshold U b(i+1) ’ can be the same as the i-th pre-overvoltage trigger threshold U bi The i+2-th pre-overvoltage trigger threshold U b(i+2) The corresponding pre-overvoltage exit threshold U b(i+2) ’ can be the same as the i+1-th pre-overvoltage trigger threshold U bi The i-th pre-overvoltage trigger threshold U bi The i+2-th pre-overvoltage trigger threshold U b(i+2) may constitute the i+1-th voltage interval, when the battery charging voltage is in the i+1-th voltage interval, the i+1-th pre-overvoltage trigger threshold U b(i+1) The corresponding battery pre-overvoltage protection mode is entered.

[0081] It should be noted that the n-th pre-overvoltage trigger threshold is less than or equal to the full charging cutoff voltage of the battery, and when the battery charging voltage is greater than the n-th pre-overvoltage trigger threshold, it means that the battery is overvoltage, at this time, the corresponding overvoltage protection strategy may be triggered to protect the battery from overvoltage.

[0082] In an implementation manner, step S120 can further include:

[0083] In response to the charging voltage being reduced to below the preset pre-overvoltage exit threshold within the preset recovery time, the corresponding battery pre-overvoltage protection mode is exited.

[0084] After the recovery time condition is added, not only is a response made after the voltage decreases to below the pre-overvoltage exit threshold, but it is also necessary to confirm that this state lasts for a period of time. This helps to reduce the situation of mistakenly exiting the pre-overvoltage protection mode due to voltage instantaneous fluctuation, thereby improving the accuracy and stability of the pre-overvoltage protection.

[0085] It should be noted that the pre-overvoltage trigger threshold, the pre-overvoltage exit threshold, the battery full charge cut-off voltage, the trigger time and the recovery time involved in the pre-overvoltage protection method provided by the embodiments of the present application can be obtained by bench test calibration according to the charge and discharge characteristics of the battery cell.

[0086] In the present embodiment, three-stage battery pre-overvoltage protection is provided, and the pre-overvoltage trigger threshold includes three, each pre-overvoltage trigger threshold corresponds to a battery pre-overvoltage protection mode, and each battery pre-overvoltage protection mode corresponds to a recharge power limitation coefficient, as shown in Table 1 below.

[0087] Table 1

[0088]

[0089] In Table 1, U0 is the charge cut-off voltage, the three pre-overvoltage trigger thresholds are respectively a first pre-overvoltage trigger threshold U b1 , a second pre-overvoltage trigger threshold U b2 and a third pre-overvoltage trigger threshold U b3 , U b1 <U b2 <U b3 , U b1 =U0-300, U b2 =U0-200, U b3 =U0; the first pre-overvoltage trigger threshold U b1 corresponds to a first pre-overvoltage exit threshold U b1 ', the second pre-overvoltage trigger threshold U b2 corresponds to a second pre-overvoltage exit threshold U b2 , and the third pre-overvoltage trigger threshold U b3 corresponds to a third pre-overvoltage exit threshold U b3 ', U b1 '<U b2 '<U b3 ', U b1 '=U0-350, U b2 '=U0-300, U b3 '=U0-200. That is, the second pre-overvoltage trigger threshold U b2 corresponds to the second pre-overvoltage exit threshold U b2 ' which is the same as the first pre-overvoltage trigger threshold U b1 , and the third pre-overvoltage trigger threshold U b3 corresponds to the third pre-overvoltage exit threshold Ub3 the second pre-overvoltage trigger threshold U b2 .

[0090] In the above implementation manner, the first pre-overvoltage trigger threshold U b1 corresponds to the first battery pre-overvoltage protection mode, the first battery pre-overvoltage protection mode corresponds to a recharging power limitation coefficient X1=0.75; the second pre-overvoltage trigger threshold U b2 corresponds to the second battery pre-overvoltage protection mode, the second battery pre-overvoltage protection mode corresponds to a recharging power limitation coefficient X2=0.5; the third pre-overvoltage trigger threshold U b3 corresponds to the third battery pre-overvoltage protection mode, the third battery pre-overvoltage protection mode corresponds to a recharging power limitation coefficient X3=0.2.

[0091] Specifically, during vehicle driving, in response to the charging voltage U c of the battery being greater than the first pre-overvoltage trigger threshold U b1 and less than or equal to the second pre-overvoltage trigger threshold U b2 , i.e. U0-300 c ≤U0-200, and the duration reaches a preset trigger time T b =500ms, the first battery pre-overvoltage protection mode is entered, and a recharging power limitation value P 01 =P max *X1 is determined, so as to limit the recharging power of the battery to be below the recharging power limitation value P 01 Below, the charging voltage is reduced; in response to the charging voltage U c of the battery being below the first pre-overvoltage exit threshold U b ’ within a preset recovery time T b1 ’=2000ms, i.e. U c <U0-350, the first battery pre-overvoltage protection mode is exited.

[0092] During vehicle driving, in response to the charging voltage U c of the battery being greater than the second pre-overvoltage trigger threshold U b2 and less than or equal to the third pre-overvoltage trigger threshold U b3 , i.e. U0-200 c ≤U0-100, and the duration reaches a preset trigger time T b =500ms, the second battery pre-overvoltage protection mode is entered, and a recharging power limitation value P 02 =P max *X2 is determined, so as to limit the recharging power of the battery to be below the recharging power limitation value P 02 Below, the charging voltage is reduced; in response to the charging voltage U c of the battery being below the first pre-overvoltage exit threshold U bU0-300, exit the second battery pre-overvoltage protection mode. b2 U0-200, exit the third battery pre-overvoltage protection mode. c U0-300, exit the second battery pre-overvoltage protection mode.

[0093] During the driving of the vehicle, in response to the charging voltage U c of the battery being greater than a third pre-overvoltage trigger threshold U b1 and less than or equal to a pre-overvoltage trigger threshold U a , i.e., U0 c ≤ U a , and the duration reaches a preset trigger time T b = 500 ms, i.e., entering the third battery pre-overvoltage protection mode, determining a recharge power limit value P 03 = P max *X3, limiting the recharge power of the battery to the recharge power limit value P 03 , and reducing the charging voltage; in response to the charging voltage U c of the battery being less than the third pre-overvoltage trigger threshold U b within a preset recovery time T b3 = 2000 ms, reducing to a third pre-overvoltage exit threshold U c , i.e., U a < U c , exiting the third battery pre-overvoltage protection mode.

[0094] It should be noted that if U a < U c , the battery overvoltage protection is triggered, and the specific strategy of the battery overvoltage protection can be referred to the foregoing description, which will not be described here.

[0095] It should be noted that the above is only an illustrative example, and the embodiments of the present application are not limited thereto.

[0096] In some implementations, the battery protection method can further include:

[0097] In response to the charging voltage of the vehicle battery being greater than any preset overvoltage trigger threshold, entering the corresponding overvoltage protection mode.

[0098] The overvoltage trigger threshold includes multiple overvoltage trigger thresholds, each of the multiple overvoltage trigger thresholds is greater than the pre-overvoltage trigger threshold, each overvoltage trigger threshold is provided with an overvoltage protection mode, and the overvoltage protection modes corresponding to different overvoltage trigger thresholds are different. The overvoltage protection mode includes limiting the recharge power of the battery, or controlling the vehicle to enter a limp mode, or controlling the vehicle to directly power off.

[0099] In some implementations, in response to the charging voltage of the vehicle battery being greater than any preset overvoltage trigger threshold and lasting for a preset overvoltage trigger time, entering the corresponding overvoltage protection mode.

[0100] For example, the embodiment is provided with three overvoltage trigger thresholds U a1 , U a2 and U a3 , and each of the three overvoltage trigger thresholds is greater than the full-charge cut-off voltage U0 of the battery, i.e., greater than the pre-overvoltage trigger threshold, and U0 < U a1 < U a2 < U a3 . Each overvoltage trigger threshold corresponds to an overvoltage protection mode, and in response to the battery charging voltage being greater than any pre-set overvoltage trigger threshold and lasting for a set overvoltage trigger time, the corresponding overvoltage protection mode is entered.

[0101] Specifically, in response to the charging voltage U c of the vehicle battery being greater than the first overvoltage trigger threshold U a1 and less than or equal to the second overvoltage trigger threshold U a2 , i.e., U a1 < U c ≤ U a2 , the first overvoltage protection mode is entered, which is used to limit the recharging power of the battery to reduce the charging voltage; in response to the charging voltage U c being greater than the second overvoltage trigger threshold U a2 and less than or equal to the third overvoltage trigger threshold U a3 , i.e., U a2 < U c ≤ U a3 , the second overvoltage protection mode is entered, which is used to control the vehicle to enter a limp-home mode; and in response to the charging voltage U c being greater than the third overvoltage trigger threshold U a3 , i.e., U a3 < U c , the third overvoltage protection mode is entered, which is used to control the vehicle to directly power off.

[0102] By setting multiple overvoltage protection voltage thresholds, redundant protection can be provided. When the protection mechanism of a certain threshold fails, the protection of other thresholds can still play a role, thereby improving the reliability of the entire protection system. Different overvoltage protection voltage thresholds can correspond to different overvoltage protection modes. When the voltage exceeds a lower overvoltage protection threshold, only the recharging power needs to be limited to reduce the charging voltage. When the voltage exceeds a higher threshold, more stringent protection measures need to be taken, such as controlling the vehicle to limp or power off. This hierarchical response strategy can more effectively cope with different degrees of overvoltage situations.

[0103] Based on the same inventive concept, the embodiment of the present application also provides a battery protection device for implementing pre-overvoltage protection of a battery. Figure 2is a structural block diagram of a battery protection device provided by an embodiment of the present application, as shown in the figure, the battery protection device 200 includes a pre-overvoltage protection module 210 and a pre-overvoltage exit module 220. Figure 2

[0104] The pre-overvoltage protection module 210 is configured to, in response to the battery charging voltage of the vehicle being greater than any preset pre-overvoltage trigger threshold during vehicle driving, enter a corresponding battery pre-overvoltage protection mode to reduce the charging voltage.

[0105] The pre-overvoltage exit module 220 is configured to, in response to the charging voltage being reduced to below a preset pre-overvoltage exit threshold, exit the corresponding battery pre-overvoltage protection mode.

[0106] The pre-overvoltage trigger threshold includes a plurality of pre-overvoltage trigger thresholds, each pre-overvoltage trigger threshold is provided with a battery pre-overvoltage protection mode and a pre-overvoltage exit threshold, each pre-overvoltage trigger threshold is greater than the corresponding pre-overvoltage exit threshold, and the plurality of pre-overvoltage trigger thresholds are less than the battery full-charge cutoff voltage, and the battery pre-overvoltage protection modes corresponding to different pre-overvoltage trigger thresholds are different.

[0107] In some implementations, the pre-overvoltage protection module 210 is further configured to:

[0108] obtain the current maximum allowable recharge power of the battery;

[0109] determine a recharge power limit value based on the maximum allowable recharge power and a preset recharge power limit coefficient, and limit the recharge power of the battery to be below the recharge power limit value.

[0110] In some implementations, the pre-overvoltage protection module 210 is further configured to:

[0111] obtain a state parameter of the battery, the state parameter at least including a battery SOC and a battery temperature;

[0112] determine the corresponding maximum allowable recharge power under the current state parameter of the battery based on a pre-labeled mapping relationship between the state parameter and the maximum allowable recharge power.

[0113] In some implementations, the pre-overvoltage trigger threshold includes n pre-overvoltage trigger thresholds, and the pre-overvoltage protection module 210 is further configured to:

[0114] in response to the battery charging voltage being greater than the i-th pre-overvoltage trigger threshold and less than or equal to the i+1-th pre-overvoltage trigger threshold, enter the battery pre-overvoltage protection mode corresponding to the i-th pre-overvoltage trigger threshold;

[0115] in response to the battery charging voltage being reduced to below the pre-overvoltage exit threshold corresponding to the i-th pre-overvoltage trigger threshold, exit the battery pre-overvoltage protection mode corresponding to the i-th pre-overvoltage trigger threshold, i+1≤n.​

[0116] In some implementations, each battery pre-overvoltage protection mode corresponds to a recharge power limiting coefficient. The larger the pre-overvoltage trigger threshold corresponding to the battery pre-overvoltage protection mode, the smaller the recharge power limiting coefficient corresponding to the battery pre-overvoltage protection mode.

[0117] In some implementations, the pre-overvoltage protection module 210 is also used for:

[0118] The rate of power change during battery recharging is limited to be less than or equal to the set limit rate.

[0119] In some implementations, the pre-overvoltage protection module 210 is also used for:

[0120] In response to the battery charging voltage being greater than any preset pre-overvoltage trigger threshold and the duration reaching the preset trigger time, the corresponding battery pre-overvoltage protection mode is entered.

[0121] In response to the charging voltage dropping below the preset pre-overvoltage exit threshold within the preset recovery time, the corresponding battery pre-overvoltage protection mode is exited.

[0122] In some implementations, the battery protection device also includes an overvoltage protection module, which is used for:

[0123] In response to the vehicle battery charging voltage exceeding any preset overvoltage trigger threshold, the corresponding overvoltage protection mode is entered.

[0124] Among them, there are multiple overvoltage trigger thresholds, all of which are greater than the pre-overvoltage trigger threshold. Each overvoltage trigger threshold corresponds to an overvoltage protection mode, and different overvoltage trigger thresholds correspond to different overvoltage protection modes.

[0125] Overvoltage protection modes include limiting the battery's recharge power, controlling the vehicle to enter limp mode, or controlling the vehicle to shut down directly.

[0126] In some implementations, the overvoltage protection module is also used for:

[0127] If the charging voltage of the vehicle battery exceeds any preset overvoltage trigger threshold and the duration exceeds the preset overvoltage trigger time, the corresponding overvoltage protection mode will be entered.

[0128] In some implementations, the overvoltage protection module is also used for:

[0129] In response to the charging voltage U of the vehicle battery c Greater than the first overvoltage trigger threshold U a1 And less than or equal to the second overvoltage trigger threshold U a2 , that is U a1 <Uc ≤U a2 , enters a first overvoltage protection mode, the first overvoltage protection mode is used to limit the recharge power of the battery to reduce the charging voltage;

[0130] in response to the charging voltage U of the vehicle battery c greater than a second overvoltage trigger threshold U a2 and less than or equal to a third overvoltage trigger threshold U a3 , that is, U a2 <U c ≤U a3 , enters a second overvoltage protection mode, the second overvoltage protection mode is used to control the vehicle to enter a limp-home mode;

[0131] in response to the charging voltage U of the vehicle battery c greater than a third overvoltage trigger threshold U a3 , that is, U a3 <U c , enters a third overvoltage protection mode, the third overvoltage protection mode is used to control the vehicle to directly power off.

[0132] It should be noted that the battery protection device provided in the above embodiment is only exemplified by the division of the above functional modules when performing pre-overvoltage protection. In actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the vehicle controller or the BMS is divided into different functional modules to complete all or part of the functions described above. In addition, the battery protection device and the battery protection method provided in the above embodiment belong to the same concept, and the specific implementation process is described in the method embodiment, which will not be repeated here.

[0133] Based on the same inventive concept as the battery protection method described above, this invention also provides an electronic device, which may include a processor and a memory, wherein the processor and memory can communicate with each other via a bus or other means. The processor may be a Central Processing Unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the battery protection method in this embodiment. The processor executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory, thereby realizing the battery pre-overvoltage protection in the above method embodiments.

[0134] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created by the processor, etc. Furthermore, the memory may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. The one or more modules are stored in the memory and, when executed by the processor, perform actions such as... Figure 1 The battery protection method in the illustrated embodiment.

[0135] For specific details regarding the aforementioned electronic devices, please refer to the relevant documentation. Figure 1 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0136] Based on the same inventive concept as the battery protection method, the present invention also provides a computer-readable storage medium storing computer instructions, which are used to cause a computer to execute the battery protection method in the above embodiments.

[0137] This application also provides a computer program product that stores at least one piece of program code, which is loaded and executed by a processor to implement the battery protection method shown in the above embodiments.

[0138] In some embodiments, the computer program product related to the embodiments of the present application can be deployed to execute on one vehicle controller, or on multiple vehicle controllers located at one site, or on multiple vehicle controllers distributed at multiple sites and interconnected through a communication network, which can constitute a blockchain system.

[0139] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiments of each method. The storage medium can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc. The storage medium can also include a combination of the above-mentioned types of memories.

[0140] The technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0141] The battery protection method, device, equipment and storage medium provided by the embodiments of the present application can intervene before the battery charging voltage approaches the full charge cutoff voltage by setting a pre-overvoltage trigger threshold (less than or equal to the battery full charge cutoff voltage), enter the corresponding battery pre-overvoltage protection mode, and reduce the charging voltage in time to prevent triggering the battery overvoltage protection. On the one hand, it can effectively prevent the safety risk caused by power failure during vehicle driving, and ensure the vehicle safety of the user during vehicle driving. On the other hand, the protection is intervened when the battery voltage shows an overvoltage trend but has not reached a serious overvoltage state, and the charging voltage is reduced. As long as the charging voltage can be reduced to below the pre-overvoltage exit threshold, the protection mode is exited, avoiding damage to the battery pack due to serious overvoltage, greatly reducing the probability of replacing the battery pack due to overvoltage failure, thereby significantly reducing maintenance costs and ensuring battery safety. At the same time, multiple pre-overvoltage trigger thresholds provide a multiple protection mechanism, which can take different protection measures for different degrees of pre-overvoltage, avoiding the problem of excessive protection or insufficient protection caused by the one-size-fits-all protection method, and improving the reliability of the method. Each threshold corresponds to a specific pre-overvoltage protection mode, making the protection strategy more detailed and enabling more accurate response to voltage changes during the battery charging process. When the charging voltage changes, the pre-overvoltage protection strategy can be dynamically adjusted according to the real-time state of the battery, thereby avoiding triggering the battery overvoltage protection.

[0142] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0143] Similarly, it is to be understood that the embodiments of the present application can be readily combined with one another and / or other concepts, to produce further embodiments of the present application, as will be apparent to those of ordinary skill in the art. For example, the various features of the above-described embodiments can be interchanged, combined, and / or rearranged to produce further embodiments of the present application.

[0144] It is to be understood that the embodiments of the present application as described above are illustrative only and not limiting of the present application as claimed. Numerous modifications and variations are possible in light of the above teachings without departing from the scope of the present application.

Claims

1. A battery protection method, characterized by, The method comprises: In response to a charging voltage of a vehicle battery being greater than any preset pre-overvoltage trigger threshold, entering a corresponding battery pre-overvoltage protection mode to reduce the charging voltage; In response to the charging voltage being reduced to below a preset pre-overvoltage exit threshold, exiting the corresponding battery pre-overvoltage protection mode; The pre-overvoltage trigger threshold comprises a plurality of pre-overvoltage trigger thresholds, each of which is provided with a corresponding battery pre-overvoltage protection mode and a corresponding pre-overvoltage exit threshold, each of the pre-overvoltage trigger thresholds is greater than the corresponding pre-overvoltage exit threshold, and the plurality of pre-overvoltage trigger thresholds are less than or equal to a battery full-charge cut-off voltage, and the battery pre-overvoltage protection modes corresponding to different pre-overvoltage trigger thresholds are different. The method further comprises: In response to a charging voltage of a vehicle battery being greater than any preset overvoltage trigger threshold, entering a corresponding overvoltage protection mode; The overvoltage trigger threshold comprises a plurality of overvoltage trigger thresholds, each of which is greater than the pre-overvoltage trigger threshold, each of the overvoltage trigger thresholds is provided with a corresponding overvoltage protection mode, and the overvoltage protection modes corresponding to different overvoltage trigger thresholds are different; the overvoltage protection mode comprises limiting the recharge power of the battery, or controlling the vehicle to enter a limp-home mode, or directly powering off the vehicle; when the charging voltage exceeds a lower overvoltage trigger threshold, only the recharge power needs to be limited to reduce the charging voltage; when the charging voltage exceeds a higher overvoltage trigger threshold, more stringent protection measures need to be taken.

2. The method of claim 1, wherein, The entering of the corresponding battery pre-overvoltage protection mode comprises: Obtaining the current maximum allowable recharge power of the battery; Based on the maximum allowable recharge power and a preset recharge power limitation coefficient, determining a recharge power limitation value and limiting the recharge power of the battery to be below the recharge power limitation value.

3. The method of claim 2, wherein, The obtaining of the current maximum allowable recharge power of the battery comprises: Obtaining a current state parameter of the battery, the state parameter comprising at least a battery SOC and a battery temperature; Based on a pre-labeled mapping relationship between the state parameter and the maximum allowable recharge power, determining the corresponding maximum allowable recharge power under the current state parameter of the battery.

4. The method of claim 2, wherein, Each of the battery pre-overvoltage protection modes corresponds to a recharge power limitation coefficient, and the greater the pre-overvoltage trigger threshold corresponding to the battery pre-overvoltage protection mode, the smaller the recharge power limitation coefficient corresponding to the battery pre-overvoltage protection mode.

5. The method of claim 2, wherein, The entering of the corresponding battery pre-overvoltage protection mode further comprises: Limiting the power change rate during the recharge of the battery to be less than or equal to a set limitation rate.

6. The method of claim 1, wherein, The method further comprises: In response to a charging voltage of a vehicle battery being greater than any preset pre-overvoltage trigger threshold and a duration reaching a preset trigger time, entering a corresponding battery pre-overvoltage protection mode; In response to the charging voltage being reduced to below a preset pre-overvoltage exit threshold within a preset recovery time, exiting the corresponding battery pre-overvoltage protection mode.

7. A battery protection device, characterized by The method comprises: The pre-overvoltage protection module is configured to, in response to a charging voltage of a vehicle battery being greater than any pre-overvoltage trigger threshold, enter a corresponding battery pre-overvoltage protection mode to reduce the charging voltage during vehicle driving; The pre-overvoltage exit module is configured to, in response to the charging voltage being reduced to below a pre-overvoltage exit threshold, exit the corresponding battery pre-overvoltage protection mode. The pre-overvoltage trigger thresholds include a plurality of pre-overvoltage trigger thresholds, each of which is associated with a corresponding battery pre-overvoltage protection mode and a pre-overvoltage exit threshold, each of the pre-overvoltage trigger thresholds is greater than the corresponding pre-overvoltage exit threshold, and the plurality of pre-overvoltage trigger thresholds are less than or equal to a battery full-charge cutoff voltage, and the battery pre-overvoltage protection modes corresponding to different pre-overvoltage trigger thresholds are different. The device further includes an overvoltage protection module configured to: in response to a charging voltage of a vehicle battery being greater than any overvoltage trigger threshold, enter a corresponding overvoltage protection mode. The overvoltage trigger thresholds include a plurality of overvoltage trigger thresholds, each of which is associated with a corresponding overvoltage protection mode, and the overvoltage protection modes corresponding to different overvoltage trigger thresholds are different; the overvoltage protection modes include limiting the battery's recharge power, or controlling the vehicle to enter a limp-home mode, or directly powering off the vehicle; when the charging voltage exceeds a lower overvoltage trigger threshold, only the recharge power needs to be limited to reduce the charging voltage; when the charging voltage exceeds a higher overvoltage trigger threshold, more stringent protection measures need to be taken.

8. An electronic device, comprising: The device includes: a memory and a processor in communication connection with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the battery protection method of any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium stores computer instructions for causing the computer to perform the battery protection method of any one of claims 1 to 6.

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