Power battery pack, vehicle and method

Abstract

The application relates to the technical field of new energy vehicles, in particular to a power battery pack, a vehicle and a method, wherein the power battery pack comprises a first power storage assembly and a second power storage assembly, the first power storage assembly and the second power storage assembly are both used for storing and releasing electric quantity, the first power storage assembly and the second power storage assembly can charge and discharge each other, the electric quantity stored by the first power storage assembly is greater than the electric quantity stored by the second power storage assembly; and a controller is used for storing the electric quantity generated by energy recovery of the vehicle in the first power storage assembly and / or the second power storage assembly during a vehicle energy recovery process, and releasing the electric quantity in the first power storage assembly and / or the second power storage assembly during a vehicle driving process to provide driving energy. Therefore, the problems that the power battery has insufficient recovery capability in a high electric quantity state, insufficient discharging capability in a low electric quantity state and the service life of the power battery pack is shortened in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a power battery pack, a vehicle, and a method. Background Technology

[0002] Due to the dual pressures of the environment and energy, the motors, power batteries, and control technologies of electric vehicles have developed rapidly. However, the low driving range of electric vehicles still restricts their development. Because electric vehicles have a limited amount of power batteries, the power of the batteries cannot meet the needs of the vehicle, thus limiting the driving range. At the same time, ambient temperature also affects the increase of the driving range of electric vehicles.

[0003] In practical engineering applications, the vehicle's recycling capacity is limited when the power battery is fully charged or at a high charge level; the driving capability is limited when the battery is at a low charge level; and the lifespan of the power battery pack and the capacity degradation are key factors affecting the overall lifespan of new energy electric vehicles. Summary of the Invention

[0004] The present invention provides a power battery pack, a vehicle, and a method to solve the problems in the prior art, such as insufficient recycling capacity of power batteries in the high-charge state and insufficient discharge capacity in the low-charge state, which leads to a reduction in the lifespan of the power battery pack.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A power battery pack includes a first energy storage component and a second energy storage component, wherein both the first and second energy storage components are used to store and release energy, and can charge and discharge each other, with the first energy storage component storing more energy than the second energy storage component; a controller is used to control the first and / or second energy storage components to store the energy generated by energy recovery during vehicle energy recovery, and to control the first and / or second energy storage components to release energy during vehicle driving to provide driving energy.

[0007] Based on the above technical means, the embodiments of this application utilize the mutual charging and discharging function between the first energy storage component and the second energy storage component to store the electricity generated during the energy recovery process of the vehicle and release the electricity during the vehicle driving process, thereby making up for the problems of insufficient high-energy recovery capacity and insufficient low-energy discharge capacity of the power battery, so as to increase the service life of the power battery pack.

[0008] Furthermore, the first energy storage component includes multiple battery cells, and the second energy storage component includes a capacitor, an inductor, and a battery. The first energy storage component and the second energy storage component are connected by a high-voltage circuit.

[0009] According to the above technical means, the first energy storage component of this application embodiment includes multiple battery cells, which can store a large amount of electricity and undertake the charging and discharging of the main part; the second energy storage component includes a capacitor, an inductor and a battery, which can undertake part of the charging and discharging, and the charging and discharging switching between the first energy storage component and the second energy storage component can be realized through a high-voltage circuit connection.

[0010] A vehicle includes a power battery pack as described in the above embodiments.

[0011] An energy recovery method utilizes a power battery pack as described in the above embodiments for energy recovery. The method includes the following steps: during vehicle energy recovery, acquiring the actual state of charge (SOC) of a first energy storage component; calculating a first actual recovery power of the first energy storage component based on its actual SOC; determining the respective recovery power of the first and second energy storage components based on the first actual recovery power and a target recovery power; and controlling the first and second energy storage components to store the recovered energy according to their respective recovery powers.

[0012] Further, determining the recovery power of the first and second energy storage components based on the first actual recovery power and the target recovery power includes: if the first actual recovery power is greater than the target recovery power, then matching the recovery power of the first and second energy storage components based on the difference between the actual SOC and the target SOC of the second energy storage component; if the first actual recovery power is less than or equal to the target recovery power, then calculating the second actual recovery power of the second energy storage component based on the actual SOC of the second energy storage component, and when the sum of the first and second actual recovery powers is greater than the target recovery power, using the first actual recovery power as the recovery power of the first energy storage component, and using the power difference between the target recovery power and the first actual recovery power as the recovery power of the second energy storage component; otherwise, using the first actual recovery power and the second actual recovery power as the recovery power of the first and second energy storage components respectively.

[0013] A vehicle driving method utilizes a power battery pack as described in the above embodiments to drive the vehicle, wherein the method includes the following steps: during vehicle driving, acquiring the actual state of charge (SOC) of a first energy storage component; calculating a first actual discharge power of the first energy storage component based on its actual SOC; determining the discharge power of each of the first and second energy storage components based on the first actual discharge power and a target discharge power; and controlling the first and second energy storage components to release electrical energy according to their respective discharge powers to provide driving energy.

[0014] A vehicle current stabilization method utilizes a power battery pack as described in the above embodiments to stabilize the vehicle current. The method includes the following steps: detecting whether the vehicle switches from a current operating condition to a target operating condition; if the vehicle switches from the current operating condition to the target operating condition, switching a second energy storage component from its current state to the target state, and detecting the actual power of the second energy storage component in the target state; if the actual power is greater than or equal to the target power, switching a first energy storage component from its current state to the target state after a preset time; otherwise, switching the first energy storage component from its current state to the target state in conjunction with the first energy storage component, thereby achieving current stabilization during operating condition switching.

[0015] A method for maintaining a power battery pack, used for maintaining a power battery pack as described in the above embodiments, wherein the method includes the following steps: detecting whether the power battery meets maintenance conditions; if the power battery meets the maintenance conditions, charging a second energy storage component through an external power source or a first energy storage component until the actual state of charge (SOC) of the second energy storage component reaches the maintenance target and then stopping the charging; using the second energy storage component to charge the first energy storage component with a preset current until the stopping condition is met and then stopping the charging, thereby achieving the maintenance of the power battery.

[0016] Furthermore, before charging the second energy storage component via an external power source or the first energy storage component, the method further includes: if the vehicle is in motion, increasing the discharge power of the first energy storage component and the recovery power of the second energy storage component.

[0017] The beneficial effects of this invention are:

[0018] (1) The embodiments of this application utilize the mutual charging and discharging function between the first energy storage component and the second energy storage component to store the electricity generated during the energy recovery process of the vehicle and release the electricity during the vehicle driving process, thereby making up for the problem of insufficient high-energy recovery capacity and insufficient low-energy discharge capacity of the power battery, so as to increase the service life of the power battery pack.

[0019] (2) The first energy storage component in this application embodiment includes multiple cells, which can store a large amount of electricity and undertake the charging and discharging of the main part; the second energy storage component includes a capacitor, an inductor and a battery, which can undertake part of the charging and discharging, and the charging and discharging between the first energy storage component and the second energy storage component can be realized by connecting them through a high-voltage circuit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a power battery pack provided in an embodiment of this application;

[0021] Figure 2 This is an overall structural diagram of the power battery pack provided in an embodiment of this application;

[0022] Figure 3 A flowchart of an energy recovery method provided in an embodiment of this application;

[0023] Figure 4 A flowchart illustrating the recycling process provided in this application embodiment;

[0024] Figure 5 A flowchart of a vehicle driving method provided in an embodiment of this application;

[0025] Figure 6 A flowchart illustrating the driving conditions provided in this application embodiment;

[0026] Figure 7 This is a flowchart of a vehicle flow stabilization method provided in an embodiment of this application;

[0027] Figure 8 A flowchart illustrating the current stabilization function provided in this application embodiment;

[0028] Figure 9 A flowchart illustrating a maintenance method for a power battery pack provided in an embodiment of this application;

[0029] Figure 10 This is a flowchart illustrating the battery maintenance function provided in one embodiment of this application.

[0030] Figure 11 A flowchart illustrating the battery maintenance function provided in another embodiment of this application.

[0031] Among them, 1 (100) - first energy storage component, 2 (200) - second energy storage component, 3 (300) - controller, 4 - motor, 10 - power battery pack. Detailed Implementation

[0032] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0033] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] Specifically, Figure 1 This is a schematic diagram of a power battery pack provided in an embodiment of this application.

[0035] like Figure 1 As shown, the power battery pack 10 includes: a first energy storage component 100, a second energy storage component 200, and a controller 300.

[0036] The first energy storage component 100 and the second energy storage component 200 are both used to store and release energy. The first energy storage component 100 and the second energy storage component 200 can charge and discharge each other, and the energy stored in the first energy storage component 100 is greater than the energy stored in the second energy storage component 200. The controller 300 is used to control the first energy storage component 100 and / or the second energy storage component 200 to store the energy generated by energy recovery during the vehicle energy recovery process, and to control the first energy storage component 100 and / or the second energy storage component 200 to release the energy during the vehicle driving process to provide driving energy.

[0037] The controller can be a BMS (Battery Management System) controller, which is an electronic control unit that includes a CPU (Central Processing Unit), RAM (random access memory), ROM (Read-Only Memory), etc., without specific limitations.

[0038] It is understood that the embodiments of this application utilize the mutual charging and discharging function between the first energy storage component and the second energy storage component to store the electricity generated during the energy recovery process of the vehicle and release the electricity during the vehicle driving process, thereby improving the service life of the power battery.

[0039] Specifically, during the vehicle's energy recovery process, the second and first energy storage components recover energy according to a certain ratio. When the first energy storage component reaches its maximum capacity, the excess is handled by the second energy storage component. When the first energy storage component has a high charge and no recovery capacity, energy recovery is entirely completed by the second energy storage component. Simultaneously, during energy recovery, the second energy storage component can perform rectification and peak shaving. During vehicle driving, when the buffer has no charge, the first energy storage component provides driving energy. When the buffer has a high charge, the buffer discharges first, with the first energy storage component assisting in the discharge. When the buffer has a low charge, the first energy storage component discharges first, with the buffer assisting in the discharge. The first and second energy storage components can charge and discharge each other. Under certain conditions, the second energy storage component can charge the first energy storage component with a stable voltage and current, thus maintaining the first energy storage component.

[0040] In this embodiment, the first energy storage component 100 includes multiple battery cells, and the second energy storage component 200 includes a capacitor, an inductor, and a battery. The first energy storage component 100 and the second energy storage component 200 are connected by a high-voltage circuit.

[0041] It is understood that the first energy storage component in this application embodiment includes multiple battery cells, which can store a large amount of electricity and undertake the charging and discharging of the main part; the second energy storage component includes a capacitor, an inductor and a battery, which can undertake part of the charging and discharging, and the charging and discharging between the first energy storage component and the second energy storage component can be realized through a high-voltage circuit connection.

[0042] Specifically, the first energy storage module is the main charging and discharging component of the power battery pack, storing more than 95% of the energy and undertaking the main charging and discharging operations. The second energy storage module consists of several capacitors, inductors, and batteries, or a group of supercapacitors, superinductors, and batteries. Its designed charging and discharging capacity is 0.8 to 1.2 times that of the first energy storage module. The second energy storage module plays a role in the charging and discharging process, and can store a certain amount of energy for a short time, but cannot store it for a long time. The controller is used to control the first and second energy storage modules, realize the switching and coordination between the first and second energy storage modules, and coordinate some other functions.

[0043] According to the power battery pack proposed in the embodiments of this application, the controller controls the mutual charging and discharging functions between the first energy storage component and the second energy storage component, so that the electricity generated by the energy recovery during the vehicle energy recovery process and the electricity released during the vehicle driving process can make up for the problems of insufficient high-energy recovery capacity and insufficient low-energy discharge capacity of the power battery, thereby increasing the service life of the power battery pack.

[0044] The following will combine Figure 2 The structure of the power battery pack is described in detail. The first energy storage component and the second energy storage component can be respectively referred to as the first energy storage component and the second energy storage component. The power battery pack includes: a first energy storage component 1, a second energy storage component 2, and a controller 3, as detailed below:

[0045] The first energy storage component 1 is a general high-voltage (400V~720V) battery; the second energy storage component 2 is composed of several capacitors, inductors and small-capacity batteries or a group of supercapacitors, inductors and small-capacity batteries. The first energy storage component 1 and the second energy storage component 2 are connected by a high-voltage circuit, which can realize mutual charging and discharging.

[0046] The controller 3 is a general BMS controller, which is an electronic control unit including CPU, RAM, ROM, etc. The controller 3 is electrically connected to the first energy storage component 1 and the second energy storage component 2. By receiving the sensor signals in the first energy storage component 1 and the second energy storage component 2, the controller 3 monitors the entire power battery pack and realizes the charging and discharging control of the power battery pack.

[0047] Specifically, during the vehicle's energy recovery process, the second and first energy storage components recover energy in a certain proportion. When the first energy storage component reaches its maximum capacity, the excess energy is handled by the second energy storage component. When the first energy storage component has a high charge and no recovery capacity, energy recovery is entirely completed by the second energy storage component. Simultaneously, during energy recovery, the second energy storage component can perform rectification and peak shaving. During vehicle driving, when the buffer has no stored charge, the first energy storage component provides driving energy. When the buffer has a high stored charge, the buffer discharges first, with the first energy storage component assisting in the discharge. When the buffer has a low charge, the first energy storage component discharges first, with the buffer assisting in the discharge. The first and second energy storage components can charge and discharge each other. Under certain conditions, the second energy storage component can charge the first energy storage component with a stable voltage and current, thus maintaining the first energy storage component.

[0048] This application also provides a vehicle including a power battery pack as described in the above embodiments.

[0049] Next, the energy recovery method proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0050] Figure 3 This is a schematic flowchart of an energy recovery method provided in an embodiment of this application.

[0051] like Figure 3 As shown, this energy recovery method utilizes a power battery pack as described in the above embodiment for energy recovery, and the method includes the following steps:

[0052] In step S101, during the vehicle energy recovery process, the actual state of charge (SOC) of the first energy storage component is obtained.

[0053] It is understood that, in the vehicle energy recovery process, the actual state of charge (SOC) of the first energy storage component is obtained in this application embodiment, so as to calculate the first actual recovered power of the first energy storage component based on the actual SOC of the first energy storage component.

[0054] In step S102, the first actual recovery power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the recovery power of the first energy storage component and the second energy storage component is determined based on the first actual recovery power and the target recovery power.

[0055] It is understood that, in the embodiments of this application, the first actual recovery power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the recovery power of the first energy storage component and the second energy storage component is determined based on the first actual recovery power and the target recovery power, so as to facilitate subsequent control of each component to store energy and recover the generated electricity according to its respective recovery power.

[0056] In this embodiment, determining the recovery power of the first and second energy storage components based on the first actual recovery power and the target recovery power includes: if the first actual recovery power is greater than the target recovery power, then matching the recovery power of the first and second energy storage components based on the difference between the actual SOC and the target SOC of the second energy storage component; if the first actual recovery power is less than or equal to the target recovery power, then calculating the second actual recovery power of the second energy storage component based on the actual SOC of the second energy storage component, and when the sum of the first and second actual recovery powers is greater than the target recovery power, using the first actual recovery power as the recovery power of the first energy storage component, and using the power difference between the target recovery power and the first actual recovery power as the recovery power of the second energy storage component; otherwise, using the first actual recovery power and the second actual recovery power as the recovery power of the first and second energy storage components respectively.

[0057] It is understood that, in this embodiment of the application, the actual recovery power of the second energy storage component is determined by comparing the actual recovery power of the first energy storage component with the target recovery power, so as to realize the capability of the second energy storage component to make up for the problem of insufficient recovery capability of the first energy storage component at high energy levels.

[0058] In step S103, the first energy storage component and the second energy storage component are controlled to store the electricity generated by energy recovery according to their respective recovery power.

[0059] It is understood that, in the embodiments of this application, the first energy storage component and the second energy storage component are controlled to store the electricity generated by energy recovery according to their respective recovery power, so as to make up for the problem of insufficient recovery capacity of the first energy storage component by the capacity of the second energy storage component.

[0060] According to the energy recovery method proposed in the embodiments of this application, during the vehicle energy recovery process, the actual state of charge (SOC) of the first energy storage component is obtained, the first actual recovery power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, the recovery power of the first energy storage component and the target recovery power are determined based on the first actual recovery power and the target recovery power, and the first energy storage component and the second energy storage component are controlled to store the electricity generated by energy recovery according to their respective recovery powers, so as to make up for the problem of insufficient recovery capacity of the first energy storage component at high charge levels by using the capacity of the second energy storage component, thereby increasing the service life of the power battery pack.

[0061] The following will combine Figure 4 The energy recovery method of this application is described in detail, and the specific steps are as follows:

[0062] (1) In the energy recovery operation, determine whether the recovery capacity of the first energy storage component is greater than the target recovery power.

[0063] (2) When the recovery capacity of the first energy storage component is greater than the target recovery power, calculate the difference Δ between the current SOC and the target SOC of the second energy storage component.

[0064] (3) Determine the ratio of the power recovered by the first energy storage component and the second energy storage component based on the difference Δ between the current SOC and the target SOC.

[0065] (4) When the recovery capacity of the first energy storage component is less than or equal to the target recovery power, continue to determine whether the sum of the recovery capacity of the first energy storage component and the recovery capacity of the second energy storage component is greater than the target recovery power.

[0066] (5) If the sum of the recovery capacity of the first energy storage component and the recovery capacity of the second energy storage component is less than or equal to the target recovery power, the first energy storage component recovers at its maximum capacity and the second energy storage component recovers at its maximum capacity.

[0067] (6) If the sum of the recovery capacity of the first energy storage component and the recovery capacity of the second energy storage component is greater than the target recovery power, the first energy storage component recovers at a ratio of its maximum capacity (e.g., 90% or 95%), and the recovery portion of the second energy storage component = target recovery power - recovery power of the first energy storage component.

[0068] In summary, during energy recovery operations, the decision to use a second energy storage component is based on the recovery capacity of the first energy storage component, thus compensating for the insufficient recovery capacity of the first energy storage component when the energy is high.

[0069] Next, the vehicle driving method proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0070] Figure 5 This is a schematic flowchart of a vehicle driving method according to an embodiment of this application.

[0071] like Figure 5 As shown, the vehicle driving method utilizes a power battery pack as described in the above embodiment to drive the vehicle, wherein the method includes the following steps:

[0072] In step S201, during vehicle driving, the actual state of charge (SOC) of the first energy storage component is obtained.

[0073] It is understood that, in the embodiments of this application, the actual state of charge (SOC) of the first energy storage component is obtained during vehicle driving, so as to calculate the first actual discharge power of the first energy storage component based on the actual SOC of the first energy storage component.

[0074] In step S202, the first actual discharge power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the discharge power of the first energy storage component and the second energy storage component are determined based on the first actual discharge power and the target discharge power.

[0075] It is understood that, in the embodiments of this application, the first actual discharge power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the discharge power of the first energy storage component and the second energy storage component is determined based on the first actual discharge power and the target discharge power, so as to facilitate subsequent control of each component to release electrical energy according to its respective discharge power.

[0076] In this embodiment, determining the discharge power of the first energy storage component and the second energy storage component based on the first actual discharge power and the target discharge power includes: if the first actual discharge power is greater than the target discharge power, then matching the discharge power of the first energy storage component and the second energy storage component based on the difference between the actual SOC and the target SOC of the second energy storage component; if the first actual discharge power is less than or equal to the target discharge power, then calculating the second actual discharge power of the second energy storage component based on the actual SOC of the second energy storage component, and when the sum of the first actual discharge power and the second actual discharge power is greater than the target discharge power, using the first actual discharge power as the discharge power of the first energy storage component, and using the power difference between the target discharge power and the first actual discharge power as the discharge power of the second energy storage component; otherwise, using the first actual discharge power and the second actual discharge power as the discharge power of the first energy storage component and the second energy storage component, respectively.

[0077] It is understood that the embodiments of this application determine the actual discharge power of the second energy storage component by comparing the actual discharge power of the first energy storage component with the target discharge power, so as to realize the capability of the second energy storage component to make up for the problem of insufficient discharge capability of the first energy storage component at low charge.

[0078] In step S202, the first energy storage component and the second energy storage component are controlled to release electrical energy according to their respective discharge power to provide driving energy, thereby increasing the service life of the power battery pack.

[0079] It is understood that the embodiments of this application control the first energy storage component and the second energy storage component to release electrical energy according to their respective discharge power to provide driving energy, so as to make up for the problem of insufficient discharge capacity of the first energy storage component when the second energy storage component is low in charge by using the capacity of the second energy storage component, thereby increasing the service life of the power battery pack.

[0080] According to the vehicle driving method proposed in the embodiments of this application, during the vehicle driving process, the actual state of charge (SOC) of the first energy storage component is obtained, the first actual discharge power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, the discharge power of the first energy storage component and the second energy storage component are determined based on the first actual discharge power and the target discharge power, and the first energy storage component and the second energy storage component are controlled to release electrical energy according to their respective discharge power to provide driving energy. This allows the capacity of the second energy storage component to compensate for the insufficient discharge capacity of the first energy storage component at low charge levels, thereby increasing the service life of the power battery pack.

[0081] The following will combine Figure 6 The vehicle driving method of this application is described in detail below:

[0082] (1) In the driving discharge condition, determine whether the discharge capacity of the first energy storage component is greater than the target discharge power.

[0083] (2) When the discharge capacity of the first energy storage component is greater than the target discharge power, calculate the difference Δ between the current SOC of the second energy storage component and the target SOC of the second energy storage component.

[0084] (3) Determine the ratio of the discharge power of the first energy storage component and the second energy storage component based on the difference Δ between the current SOC of the second energy storage component and the target SOC of the second energy storage component.

[0085] (4) When the discharge capacity of the first energy storage component is less than or equal to the target discharge power, determine whether the sum of the discharge capacity of the first energy storage component and the recovery capacity of the second energy storage component is greater than the target discharge power.

[0086] (5) If the sum of the discharge capacity of the first energy storage component and the discharge capacity of the second energy storage component is less than or equal to the target discharge power, the first energy storage component discharges at its maximum discharge capacity, and the second energy storage component discharges at its maximum discharge capacity.

[0087] (6) If the sum of the discharge capacity of the first energy storage component and the discharge capacity of the second energy storage component is greater than the target discharge power, the first energy storage component discharges at its maximum discharge capacity, and the discharge power of the second energy storage component = target discharge power - discharge power of the first energy storage component.

[0088] In summary, during the drive discharge operation, the decision to use the second energy storage component is based on the discharge capacity of the first energy storage component, thereby compensating for the insufficient low-charge discharge capacity of the first energy storage component.

[0089] Next, the vehicle flow stabilization method proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0090] Figure 7 This is a schematic flowchart of the vehicle flow stabilization method according to an embodiment of this application.

[0091] like Figure 7 As shown, the vehicle current stabilization method utilizes a power battery pack as described in the above embodiment for vehicle current stabilization, and the method includes the following steps:

[0092] In step S301, it is detected whether the vehicle has switched from the current operating condition to the target operating condition.

[0093] The target operating condition can be either the whole vehicle recycling condition or the driving condition, depending on the actual situation, without specific limitations.

[0094] It is understood that the embodiments of this application detect whether the vehicle has switched from the current working condition to the target working condition, so as to facilitate subsequent switching of the state according to different working conditions.

[0095] In step S302, if the vehicle switches from the current operating condition to the target operating condition, the second energy storage component is switched from the current state to the target state, and the actual power of the second energy storage component in the target state is detected.

[0096] It is understood that in this embodiment of the application, if the vehicle switches from the current operating condition to the target operating condition, the second energy storage component is switched from the current state to the target state, and the actual power of the second energy storage component in the target state is detected, so as to facilitate the subsequent switching of the state of the first energy storage component.

[0097] In step S303, if the actual power is greater than or equal to the target power, the first energy storage component will be switched from the current state to the target state after a preset time; otherwise, the first energy storage component will be switched from the current state to the target state to achieve current stability during the switching of operating conditions.

[0098] The preset duration can be set according to the actual situation, such as 0.5s or 1s, without specific limitations.

[0099] The target state can be either the vehicle recovery state or the driving state, depending on the actual situation, without specific limitations.

[0100] It is understood that the embodiments of this application determine whether to switch the state of the first energy storage component based on the actual power. When the actual power is greater than or equal to the target power, the first energy storage component is switched from the current state to the target state after a preset time. Otherwise, the first energy storage component is switched from the current state to the target state in conjunction with the application, so as to achieve current stability when the operating conditions are switched.

[0101] According to the vehicle current stabilization method proposed in the embodiments of this application, it is detected whether the vehicle has switched from the current operating condition to the target operating condition. If the vehicle has switched from the current operating condition to the target operating condition, the second energy storage component is switched from the current state to the target state, and the actual power of the second energy storage component in the target state is detected. Based on the magnitude of the actual power, it is determined whether to switch the state of the first energy storage component to achieve current stabilization during the operating condition switch.

[0102] The following will combine Figure 8 The vehicle current stabilization method is described in detail. The current stabilization function works when the target drive (recovery) power does not reach the drive (recovery) capabilities of the first and second energy storage components, as detailed below:

[0103] (1) When it is detected that the vehicle recycling mode and the driving mode are switching between each other.

[0104] (2) During the process of the target drive (recovery) power from peak to 0, the first energy storage component and the second energy storage component quickly reach the vicinity of the 0 power point according to the original drive (recovery) ratio.

[0105] (3) When switching from target drive (recovery) power to recovery (drive) power, the first energy storage component does not switch first, while the second energy storage component switches quickly first, and the target drive (recovery) power is first satisfied by the second energy storage component.

[0106] (4) Determine whether the driving (recycling) capability of the second energy storage component can meet the target driving (recycling) power. If it does not meet the target, the first energy storage component will immediately participate in driving (recycling), and the first energy storage component will participate in meeting the part that the second energy storage component cannot meet. If the driving (recycling) capability of the second energy storage component can meet the target driving (recycling) power, after a period of time (0.5s or 1s, which can be calibrated), the first energy storage component will smoothly transition to participate in driving (recycling). After the first energy storage component participates, the ratio of driving (recycling) of the first energy storage component to the second energy storage component in step S307 is a stable target value.

[0107] In summary, by switching the states of the first and second energy storage components according to different operating conditions of the vehicle, current stability can be achieved during the switching of operating conditions.

[0108] Next, with reference to the accompanying drawings, a maintenance method for a power battery pack according to an embodiment of this application is described.

[0109] Figure 9 This is a flowchart illustrating the maintenance method for a power battery pack according to an embodiment of this application.

[0110] like Figure 9 As shown, the maintenance method for the power battery pack is used for maintaining the power battery pack as described in the above embodiment. The method includes the following steps:

[0111] In step S401, it is detected whether the power battery meets the maintenance conditions.

[0112] The maintenance conditions can be 20 consecutive charging sessions without using slow charging, or 5,000 kilometers of continuous charging without using a charging station, or the detection of performance degradation in the first energy storage component, without specific limitations.

[0113] It is understood that the embodiments of this application detect whether the power battery meets the maintenance conditions so that the power battery can be maintained according to the actual situation in the future.

[0114] In step S402, if the power battery meets the maintenance conditions, the second energy storage component is charged through an external power source or the first energy storage component until the actual state of charge (SOC) of the second energy storage component reaches the maintenance target and then charging stops.

[0115] It is understood that, in the embodiments of this application, when the power battery is detected to meet the maintenance conditions, the second energy storage component is charged through an external power source or the first energy storage component until the actual state of charge (SOC) of the second energy storage component reaches the maintenance target, and then the charging stops to ensure the battery's charge.

[0116] In this embodiment of the application, before charging the second energy storage component through an external power source or the first energy storage component, the method further includes: if the vehicle is in motion, increasing the discharge power of the first energy storage component and the recovery power of the second energy storage component.

[0117] It is understood that, in the embodiments of this application, when the vehicle is in motion, the discharge power of the first energy storage component and the recovery power of the second energy storage component are increased, so that the first energy storage component participates more in the discharge process and the second energy storage component participates more in the recovery process.

[0118] In step S403, the first energy storage component is charged with a preset current using the second energy storage component until the stop condition is met, thereby achieving the maintenance of the power battery.

[0119] The preset current can be set according to the vehicle model or specific circumstances, without any specific limitations.

[0120] The stopping conditions can be user operation stoppage, battery maintenance time limit, power limit of the second energy storage component, power limit of the first energy storage component, or vehicle malfunction, etc., without specific limitations.

[0121] It is understood that the embodiments of this application utilize the second energy storage component to charge the first energy storage component with a preset current until the stopping condition is met, so as to achieve the maintenance of the power battery, thereby preventing the first energy storage component from degrading too quickly and increasing the service life of the power battery.

[0122] According to the power battery pack maintenance method proposed in the embodiments of this application, the power battery is tested to see if it meets the maintenance conditions. When the power battery meets the maintenance conditions, the second energy storage component is charged by an external power source or a first energy storage component until the actual state of charge (SOC) of the second energy storage component reaches the maintenance target. This stops the charging process to ensure the battery's charge level. The first energy storage component is then charged by the second energy storage component with a preset current until the charging stops when the stop conditions are met. This method achieves the maintenance of the power battery, thereby preventing the charge level of the first energy storage component from decreasing too quickly and increasing the service life of the power battery.

[0123] The following will combine Figure 10 and Figure 11 The maintenance method for the power battery pack proposed in the embodiments of this application is described in detail below:

[0124] The battery maintenance function is used to maintain the first energy storage component and prevent its charge from degrading too quickly. Its main working principle is as follows: Step S501: Battery maintenance is detected, such as after 20 consecutive charging cycles without slow charging, or after 5000 kilometers without charging at a charging station, or after performance degradation of the first energy storage component is detected. Step S502: The user is notified via the instrument panel or remote APP that the vehicle's battery needs maintenance. Step S503: The user clicks "Confirm" on the instrument panel or remote APP, authorizing the controller 3 to perform battery maintenance. By judging user behavior, different maintenance schemes are determined. First, step S505 is checked to see if the user is driving the vehicle. If not, proceed directly to S506; if so, step S505 is executed, increasing the target SOC of the second energy storage component. During discharge, the first energy storage component participates more; during recycling, the second energy storage component participates more. Step S506: It is determined whether the user performed a fast charging operation before disconnecting the power. If the user did not perform fast charging before disconnecting the power, proceed to step S507 to determine whether the remaining charge of the second energy storage component has reached the target SOC for battery maintenance at the time of power disconnection. If it has, proceed to step S510; otherwise, proceed to step S508, where the vehicle delays the high voltage drop, and the first energy storage component first rapidly charges the second energy storage component until its remaining charge reaches the target SOC for battery maintenance, and then proceed to step S510. If the user performed fast charging before disconnecting the power, proceed to step S509, where the first energy storage component is charged to 95% SOC (or 98%, depending on the vehicle model), and the second energy storage component is charged to the target SOC for battery maintenance. In step S510, the vehicle meets the prerequisite for battery maintenance, the vehicle delays the high voltage drop, and the second energy storage component slowly charges the first energy storage component with the battery maintenance current and voltage. In step S511, the battery maintenance function stops when the conditions for stopping the function are met. The conditions for stopping the battery maintenance function may include: user operation stoppage, battery maintenance time limit, power limit of the second energy storage component, power limit of the first energy storage component, and the occurrence of a vehicle malfunction.

[0125] In summary, by slowing down the charging and discharging switching of the first energy storage component, the number of battery charging and discharging cycles can be reduced. By using the second energy storage component to slowly charge the first energy storage component, the purpose of maintaining the first energy storage component can be achieved. This can increase the lifespan of the power battery pack and slow down the degradation of the battery pack's capacity.

[0126] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A power battery pack, characterized in that, include: A first energy storage component and a second energy storage component, wherein both the first energy storage component and the second energy storage component are used to store and release energy, and the first energy storage component and the second energy storage component can charge and discharge each other, and the energy stored in the first energy storage component is greater than the energy stored in the second energy storage component. The controller is used to control the first energy storage component and / or the second energy storage component to store the electricity generated by energy recovery during the vehicle energy recovery process, and to control the first energy storage component and / or the second energy storage component to release the electricity during the vehicle driving process to provide driving energy; The power battery pack is used to obtain the actual state of charge (SOC) of the first energy storage component during the vehicle energy recovery process. The first actual recovery power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the recovery power of the first energy storage component and the second energy storage component is determined based on the first actual recovery power and the target recovery power. The first and second energy storage components are controlled to store the electricity generated by energy recovery according to their respective recovery power.

2. The power battery pack according to claim 1, characterized in that, The first energy storage component includes multiple battery cells, and the second energy storage component includes a capacitor, an inductor, and a battery. The first energy storage component and the second energy storage component are connected by a high-voltage circuit.

3. A vehicle, characterized in that, Includes the power battery pack as described in claim 1 or 2.

4. An energy recovery method, characterized in that, The method utilizes the power battery pack as described in claim 1 or 2 for energy recovery, wherein determining the recovery power of the first energy storage component and the second energy storage component based on the first actual recovery power and the target recovery power includes: If the first actual recovery power is greater than the target recovery power, then the recovery power of the first energy storage component and the second energy storage component are matched according to the difference between the actual SOC and the target SOC of the second energy storage component. If the first actual recovered power is less than or equal to the target recovered power, then the second actual recovered power of the second energy storage component is calculated based on the actual SOC of the second energy storage component. If the sum of the first actual recovered power and the second actual recovered power is greater than the target recovered power, the first actual recovered power is taken as the recovered power of the first energy storage component, and the power difference between the target recovered power and the first actual recovered power is taken as the recovered power of the second energy storage component. Otherwise, the first actual recovered power and the second actual recovered power are taken as the recovered power of the first energy storage component and the second energy storage component, respectively.

5. A vehicle driving method, characterized in that, The method utilizes the power battery pack as described in claim 1 or 2 to drive the vehicle, wherein the method includes the following steps: During vehicle driving, the actual state of charge (SOC) of the first energy storage component is acquired; The first actual discharge power of the first energy storage component is calculated based on the actual SOC of the first energy storage component, and the discharge power of the first energy storage component and the second energy storage component is determined based on the first actual discharge power and the target discharge power. The first and second energy storage components are controlled to release electrical energy according to their respective discharge power to provide driving energy.

6. The vehicle driving method according to claim 5, characterized in that, Determining the discharge power of the first energy storage component and the second energy storage component based on the first actual discharge power and the target discharge power includes: If the first actual discharge power is greater than the target discharge power, then the discharge power of the first energy storage component and the second energy storage component are matched according to the difference between the actual SOC and the target SOC of the second energy storage component. If the first actual discharge power is less than or equal to the target discharge power, then the second actual discharge power of the second energy storage component is calculated based on the actual SOC of the second energy storage component. If the sum of the first actual discharge power and the second actual discharge power is greater than the target discharge power, the first actual discharge power is taken as the discharge power of the first energy storage component, and the power difference between the target discharge power and the first actual discharge power is taken as the discharge power of the second energy storage component. Otherwise, the first actual discharge power and the second actual discharge power are taken as the discharge power of the first energy storage component and the second energy storage component, respectively.

7. A method for stabilizing vehicle flow, characterized in that, The method utilizes the power battery pack as described in claim 1 or 2 to stabilize the vehicle's current, wherein the method includes the following steps: Detect whether the vehicle has switched from the current operating condition to the target operating condition; If the vehicle switches from the current operating condition to the target operating condition, the second energy storage component is switched from the current state to the target state, and the actual power of the second energy storage component in the target state is detected. If the actual power is greater than or equal to the target power, the first energy storage component will be switched from the current state to the target state after a preset time. Otherwise, the first energy storage component will be switched from the current state to the target state to achieve current stability during the switching of operating conditions.

8. A method for maintaining a power battery pack, characterized in that, The method is used for the maintenance of the power battery pack as described in claim 1 or 2, wherein the method includes the following steps: Check whether the power battery pack meets the maintenance requirements; If the power battery pack meets the maintenance conditions, the second energy storage component is charged through an external power source or the first energy storage component until the actual state of charge (SOC) of the second energy storage component reaches the maintenance target and then charging stops. The first energy storage component is charged with a preset current using the second energy storage component until the stopping condition is met, thereby achieving the maintenance of the power battery pack; The maintenance conditions are at least one of the following: 20 consecutive charging sessions without using slow charging, 5000 kilometers of continuous charging without using a charging station, or monitoring of performance degradation in the first energy storage component. The maintenance objective is to ensure that the power battery pack has sufficient charge.

9. The maintenance method for the power battery pack according to claim 8, characterized in that, Before charging the second energy storage component via an external power source or the first energy storage component, the process also includes: If the vehicle is in motion, the discharge power of the first energy storage component and the recovery power of the second energy storage component are increased.

Images