Power battery system and vehicle

Abstract

The utility model provides a power battery system and a vehicle, and the power battery system comprises a first battery device which is used for providing required power for a driving system of the vehicle; and the second battery device is connected with the first battery device and is used for supplying the required power according to the power supply signal. By arranging the two independent battery devices, namely the first battery device and the second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to the power supply signal; the second battery device serves as supplementary power energy to supply required power to the driving system, and normal operation of the driving system is met.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a power battery system and a vehicle. Background Art

[0002] In the related art, the power battery system is a single battery system, such as a single lithium iron phosphate power battery or a single ternary lithium power battery. Under the limitation of the same battery system, it is impossible to effectively balance the performance of energy density and power, and it is difficult to meet the comprehensive requirements of users for the endurance and power performance of pure electric vehicles. Moreover, the pressure on the development of power battery materials and the design of battery cells is relatively large, increasing the cost of battery materials, which is not conducive to market promotion. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the utility model is to provide a power battery system. By providing two independent battery devices, namely a first battery device and a second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to a power supply signal. The second battery device serves as an additional power source to supply the required power to the drive system, so as to meet the normal operation of the drive system.

[0005] To this end, a second object of the utility model is to provide a vehicle.

[0006] To achieve the above object, an embodiment of the first aspect of the utility model provides a power battery system, which includes: a first battery device for providing required power for the drive system of the vehicle; and a second battery device connected to the first battery device for supplying the required power according to a power supply signal.

[0007] According to the power battery system of the embodiment of the utility model, by providing two independent battery devices, namely a first battery device and a second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to a power supply signal. The second battery device serves as an additional power source to supply the required power to the drive system, so as to meet the normal operation of the drive system. At the same time, the functional characteristics of the dual battery devices can be designed separately, so that they respectively bear the power output under different working conditions. After being combined at the power battery system level, the comprehensive improvement of the endurance and power performance is realized, thereby reducing the pressure on the development of materials and the design of battery cells for the performance balance improvement of a single battery system.

[0008] In some embodiments, the first battery device includes: a first battery module, the positive electrode of the first battery module is connected to one end of the drive system, and the negative electrode of the first battery module is connected to the other end of the drive system, for outputting a supply current and a supply voltage to provide the required power for the drive system; a first current sampling module, one end of the first current sampling module is connected to the negative electrode of the first battery module, and the other end of the first current sampling module is connected to the other end of the drive system, for collecting the supply current.

[0009] In some embodiments, the second battery device includes: a second battery module, the positive electrode of the second battery module is connected to one end of the drive system, and the negative electrode of the second battery module is connected to the other end of the drive system, for outputting a supplementary supply current and a supplementary supply voltage to supplement the required power for the drive system; a second current sampling module, one end of the second current sampling module is connected to the positive electrode of the second battery module, and the other end of the second current sampling module is connected to one end of the drive system, for collecting the sum value of the supplementary supply current and the supply current.

[0010] In some embodiments, the second battery device further includes: a control switch, the first end of the control switch is connected to the negative electrode of the second battery module, the second end of the control switch is connected to the other end of the drive system, and the control end of the control switch is connected to the control module of the power battery system, for turning on the power supply circuit between the second battery module and the drive system when the supply current is greater than the current upper limit value.

[0011] In some embodiments, the second battery device further includes: a control switch, the first end of the control switch is connected to the negative electrode of the second battery module, the second end of the control switch is connected to the other end of the drive system, and the control end of the control switch is connected to the control module of the power battery system, for turning off the power supply circuit between the second battery module and the drive system when the supply current is less than or equal to the current upper limit value.

[0012] In some embodiments, the second battery device further includes: a boost module, the boost module is arranged in the power supply circuit for supplementing the required power for the drive system, for adjusting the supplementary supply voltage of the second battery module until the supplementary supply voltage of the second battery module is equal to the supply voltage of the first battery module.

[0013] In some embodiments, the difference between the number of battery cells of the first battery device and the number of battery cells of the second battery device is less than a preset number.

[0014] In some embodiments, the power battery system further includes: a control module, which is respectively connected to the first battery device and the second battery device, and is configured to turn on or off the control switch according to the required power of the drive system.

[0015] In some embodiments, the first battery module includes high-energy power batteries, and the second battery module includes high-density power batteries.

[0016] To achieve the above object, an embodiment of the second aspect of the present invention provides a vehicle, which includes the power battery system described in the above embodiments.

[0017] According to the vehicle of the embodiment of the present invention, by providing two independent battery devices, namely the first battery device and the second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to the power supply signal. The second battery device serves as an additional power source to supply the required power to the drive system, meeting the normal operation of the drive system. At the same time, the functional characteristics of the dual-battery device can be designed differently, enabling them to undertake the power output under different working conditions respectively. After being combined at the power battery system level, the comprehensive improvement of the endurance and power performance is realized, thereby reducing the pressure on material development and cell design for the performance balance improvement of a single battery system.

[0018] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0019] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0020] Figure 1 is a structural block diagram of a power battery system according to an embodiment of the present invention;

[0021] Figure 2 is a circuit schematic diagram of a power battery system according to an embodiment of the present invention;

[0022] Figure 3 is a circuit schematic diagram of a power battery system according to another embodiment of the present invention;

[0023] Figure 4 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0024] Reference Signs:

[0025] Power battery system 10;

[0026] The first battery device 1; the second battery device 2; the control module 3;

[0027] The first battery module 11;

[0028] The second battery module 21; the control switch 22; the boost module 23;

[0029] The vehicle 11. Detailed implementation manners

[0030] The embodiments of the present utility model will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model will be described in detail below.

[0031] The power battery is the sole source of driving energy for pure electric vehicles, which is directly related to the power performance, endurance capacity, and safety performance of electric vehicles. In terms of the cost composition of pure electric vehicles, the power battery system accounts for 30 - 50% of the vehicle cost. Therefore, the technological development of the power battery system also directly affects the process of the practical application and marketization of electric vehicles.

[0032] In the related art, the power battery systems are usually lithium iron phosphate power batteries and ternary lithium power batteries. Their advantages in terms of energy density, power performance, safety performance, and cost per watt-hour are different. Among them, the lithium iron phosphate power battery occupies more than 60% of the power battery market share due to its huge advantages in safety performance and cost per watt-hour; while the ternary lithium power battery emphasizes its high power performance and energy density, targeting the market of pure electric vehicles with high power performance. Considering the different requirements for the design scheme of battery cells due to the needs of vehicles in terms of endurance capacity and power performance, it is difficult to achieve the common improvement of the energy density and power density at the vehicle level through the adjustment of the battery cell design and structure. However, with the continuous increase in the market share of electric vehicles, users have higher and more comprehensive requirements for the comprehensive performance of pure electric vehicles. A single type of power battery has been difficult to meet the increasing market development needs.

[0033] Next, refer to Figures 1-3 Describe the power battery system 10 of the embodiments of the present utility model.

[0034] As Figure 1 shown, the power battery system 10 of the embodiments of the present utility model includes: the first battery device 1 and the second battery device 2. Among them, the first battery device 1 outputs as a conventional power source, continuously supplying the low-power energy demand of the vehicle and restricting high-power discharge. The second electronic device outputs as a supplementary power source, instantaneously supplying the high-power energy demand of the vehicle with low usage frequency.

[0035] The first battery device 1 is used to provide the required power for the drive system of the vehicle; the second battery device 2 is connected to the first battery device 1 and is used to supply the required power according to the power supply signal.

[0036] In an embodiment, the first battery device 1 and the second battery device 2 are connected to the vehicle's drive system in parallel. After the vehicle starts, the first battery device 1 is connected to the vehicle's drive system and starts to operate. After the vehicle's drive system operates, the first battery device 1 provides the required power for the vehicle's drive system, and continuously judges the magnitude relationship between the required power of the drive system and the upper limit value of the required power provided by the first battery device 1. If the required power of the drive system is greater than the upper limit value of the required power of the first battery device 1, it is considered that the required power provided by the first battery device 1 does not meet the normal operation of the drive system. Then, the power battery system 10 sends a power supply signal to the second battery device 2. When the second battery device 2 receives the power supply signal, the second battery device 2 supplies the required power to the drive system to make up for the power difference between the required power of the drive system and the upper limit value of the required power of the first battery device 1, so as to meet the high-power energy requirements of the vehicle, that is, the required power provided by the first battery device 1 and the required power supplied by the second battery device 2 can meet the normal operation of the drive system.

[0037] According to the power battery system 10 of the embodiment of the present invention, by providing two independent battery devices, namely the first battery device 1 and the second battery device 2, when the required power provided by the first battery device 1 exceeds the upper limit value, the second battery device 2 is started according to the power supply signal. The second battery device 2 serves as an additional power source to supply the required power to the drive system to meet the normal operation of the drive system. At the same time, the functional characteristics of the dual-battery device can be designed separately, so that they respectively undertake the power output under different working conditions. After being combined at the level of the power battery system 10, the comprehensive improvement of the endurance and power performance is realized, thereby reducing the pressure on material development and cell design for the performance balance improvement of a single battery system.

[0038] In some embodiments, as Figure 2 shown, the first battery device 1 includes a first battery module 11 and a first current sampling module, denoted as A2 for example. Among them, the positive electrode of the first battery module 11 is connected to one end of the drive system, and the negative electrode of the first battery module 11 is connected to the other end of the drive system, for outputting a supply current and a supply voltage to provide the required power for the drive system; one end of the first current sampling module A2 is connected to the negative electrode of the first battery module 11, and the other end of the first current sampling module A2 is connected to the other end of the drive system, for collecting the supply current.

[0039] In an embodiment, after the vehicle is started, the first battery device 1 is connected to the drive system of the vehicle and starts to operate. After the drive system of the vehicle operates, the first battery module 11 in the first battery device 1 outputs a supply current and a supply voltage to provide the required power for the drive system of the vehicle, and the first current sampling module A2 in the first battery device 1 collects the supply current in real time to determine the magnitude of the current provided by the first battery device 1 for the drive system.

[0040] In some embodiments, as Figure 2 shown, the second battery device 2 includes: a second battery module 21 and a second current sampling module, denoted as A1 for example. Among them, the positive electrode of the second battery module 21 is connected to one end of the drive system, and the negative electrode of the second battery module 21 is connected to the other end of the drive system, for outputting a supplementary supply current and a supplementary supply voltage to supplement the required power for the drive system; one end of the second current sampling module A1 is connected to the positive electrode of the second battery module 21, and the other end of the second current sampling module A1 is connected to one end of the drive system, for collecting the sum value of the supplementary supply current and the supply current.

[0041] In an embodiment, when the second battery device 2 receives a power supply replenishment signal, the second battery module 21 in the second battery device 2 outputs a supplementary supply current and a supplementary supply voltage to supplement the required power for the drive system, make up the power difference between the required power of the drive system and the upper limit value of the required power of the first battery device 1, and the second current sampling module A1 in the second battery device 2 collects the sum value of the supplementary supply current and the supply current in real time to determine the magnitude of the total current provided by the first battery device 1 and the second battery device 2 for the drive system.

[0042] In some embodiments, as Figure 2 shown, the second battery device 2 further includes: a control switch 22. The first end of the control switch 22 is connected to the negative electrode of the second battery module 21, the second end of the control switch 22 is connected to the other end of the drive system, and the control end of the control switch 22 is connected to the control module 3 of the power battery system 10, for conducting the power supply circuit between the second battery module 21 and the drive system when the supply current is greater than the current upper limit value.

[0043] In an embodiment, after the first current sampling module A2 in the first battery device 1 collects the supply current in real time, the magnitude relationship between the supply current and the current upper limit value is judged. When the supply current is greater than the current upper limit value, it is considered that the first battery device 1 reaches its power output upper limit. Then, the control switch 22 in the second battery device 2 conducts the power supply circuit between the second battery module 21 and the drive system. The second electronic device 2 is started as a power supplement device to make up for the power difference between the required power of the drive system and the upper limit value of the required power of the first battery device 1. By conducting the control switch 22, the second battery device 2 is connected to the power supply circuit for current supplement, the current of the main circuit is increased, and the power output of the power battery system is further improved, so as to meet the high-power energy requirements of the vehicle.

[0044] In some embodiments, as Figure 2 shown, the second battery device 2 further includes: a control switch 22. The first end of the control switch 22 is connected to the negative electrode of the second battery module 21, the second end of the control switch 22 is connected to the other end of the drive system, and the control end of the control switch 22 is connected to the control module 3 of the power battery system 10, and is used to turn off the power supply circuit between the second battery module 21 and the drive system when the supply current is less than or equal to the current upper limit value.

[0045] In an embodiment, when the supply current is less than or equal to the current upper limit value, it is considered that the first battery device 1 does not reach its power output upper limit, and the required power provided by the first battery device 1 can meet the normal operation of the drive system. Then, the control switch 22 in the second battery device 2 turns off the power supply circuit between the second battery module 21 and the drive system. By turning off the control switch 22, the second battery device 2 is disconnected to realize the independent output of battery power by the first battery device 1.

[0046] In some embodiments, as Figure 2 shown, the second battery device 2 further includes: a boost module 23. The boost module 23 is arranged in the power supply circuit for supplying the required power to the drive system, and is used to adjust the supply voltage for supplement of the second battery module 21 until the supply voltage for supplement of the second battery module 21 is equal to the supply voltage of the first battery module 11, so as to stabilize the voltage of the second battery device 2 connected to the power supply circuit, ensure that during the operation of the vehicle, the required power provided by the first battery device 1 is the same as the required power supplemented by the second battery device 2, and prevent the situation that the high-voltage battery device charges the low-voltage battery device.

[0047] For example, when the power supply voltage of the first battery module 11 is higher than the supplementary power supply voltage of the second battery module 21, the first battery module 11 may charge the second battery module 21, which affects the energy supply of the first battery device 1 and the second battery device 2 to the drive system. Therefore, by setting up a boost module 23 to adjust the supplementary power supply voltage of the second battery module 21, the power supply voltage of the first battery module 11 and the supplementary power supply voltage of the second battery module 21 are made equal, thereby improving the safety and stability of charging.

[0048] In some embodiments, the difference in the number of battery cells of the first battery device 1 and the second battery device 2 is less than a preset number, for example, within 100 battery cells, to avoid a large deviation in the parallel voltage after the battery cells of the first battery device 1 and the second battery device 2 are connected in parallel, thereby limiting the boost range of the boost module 23.

[0049] In some embodiments, as Figure 3 shown, the power battery system 10 further includes: a control module 3, which is respectively connected to the first battery device 1 and the second battery device 2, and is used to turn on or off the control switch 22 according to the required power of the drive system.

[0050] In an embodiment, after the vehicle is started, the first battery device 1 provides the required power for the drive system of the vehicle. The control module 3 continuously judges the magnitude relationship between the required power of the drive system and the upper limit value of the required power provided by the first battery device 1. When the required power of the drive system is greater than the upper limit value of the required power of the first battery device 1, it is considered that the required power provided by the first battery device 1 does not meet the normal operation of the drive system. Then the control module 3 controls the control switch 22 in the second battery device 2 to turn on, ensuring that the second battery device 2 supplies the required power to the drive system to make up for the power difference between the required power of the drive system and the upper limit value of the required power of the first battery device 1.

[0051] When the supply current is less than or equal to the current upper limit value, it is considered that the first battery device 1 has not reached its power output upper limit, and the required power provided by the first battery device 1 can meet the normal operation of the drive system. Then the control module 3 controls the control switch 22 in the second battery device 2 to turn off, ensuring that the second battery device 2 is disconnected to achieve the independent output of battery power by the first battery device 1.

[0052] In some embodiments, the first battery module 11 includes high-energy power batteries, and the second battery module 21 includes high-density power batteries. From aspects such as the battery system, cell design, and battery structure, the two battery modules are distinguished by means of extremely different performances to ensure that the two battery modules respectively undertake the vehicle power output under different working conditions.

[0053] In an embodiment, for electric vehicles in different target markets, the design combination of the first battery module 11 and the second battery module 21 can be flexibly adjusted. For example, for economy models, the power battery power distribution of the first battery module 11 can be increased to more than 90%, and the second battery module 21 is only designed with less than 10% of the power battery power to meet the high-power output under short-term and few working conditions, and control the cost of the power battery system to the greatest extent. As the vehicle performance requirements increase, the proportion of the power battery power of the second battery module 21 is gradually increased to improve the peak value and timeliness of the power performance output of the power battery system. The present utility model adopts an independent dual-battery device structure and conducts differentiated design based on functional characteristics, so as to comprehensively improve the comprehensive performance of the power battery system 10 and optimize the cost of battery raw materials.

[0054] Correspondingly, due to different functional characteristics of the first battery module 11 and the second battery module 21, their chemical systems and cell structures can be designed separately according to vehicle performance requirements. The first battery module 11, as a battery device for main energy output, bears a high proportion of the power battery system power distribution. The design focus is on characteristics such as high energy density, long cycle life, and low watt-hour cost; the second battery module 21, as a battery device for instantaneous high-power output, needs to bear the extreme power peak. The design focus is on characteristics such as high power density and large discharge rate. The first battery module 11 undertakes energy output and limits high-power discharge, while the second battery module 21 undertakes high-power output and has a low usage frequency. It can meet the high-power energy output at the power battery system level while improving the service life of the battery system. By physically differentiating the battery functions and strengthening the characteristic performances of their respective battery systems, they are combined at the battery system level to achieve a comprehensive improvement in the comprehensive performance of the power battery system.

[0055] Optionally, the chemical system of the first battery module 11 can select a battery system with low cost of active main materials and high electrochemical stability. Taking lithium-ion batteries as an example, the electrode surface density of the positive electrode is greater than 400 g / cm2, the solid content of the active material is 96% - 99.9%, and the capacity retention rate of the battery is ≥80% under the condition of cycling 2000 times at 0.33C / 0.33C, including but not limited to lithium iron phosphate / graphite battery system, lithium manganese iron phosphate / graphite battery system, phosphate-based lithium-ion battery positive electrode material battery system, lithium-rich manganese-based positive electrode material battery system, etc. In addition, sodium-ion batteries can also be selected as the battery type of the first battery module 11 to reduce the battery cost, and solid-state batteries can be selected as the battery type of the first battery module 11 to improve the energy density of the battery.

[0056] Optionally, the cell structure of the first battery module 11 is designed based on the principle of high space utilization rate, and its battery volume energy density is higher than or equal to 400 Wh / L, including but not limited to blade battery structure, square shell battery structure, soft pack battery structure, cylindrical battery structure and other structures.

[0057] Optionally, the chemical system of the second battery module 21 selects a battery cell main material with excellent rate performance. Among them, the electrode surface density of the positive electrode is less than or equal to 400 g / cm2, the maximum discharge rate of the battery is greater than or equal to 4C discharge capacity, and the positive electrode material includes, but is not limited to, lithium manganate, lithium iron phosphate, lithium nickel cobalt manganate, lithium manganese iron phosphate / lithium nickel cobalt manganate blending system, lithium-rich high-nickel, ternary lithium, quaternary lithium and other positive electrode materials; the negative electrode material includes, but is not limited to, graphite negative electrode, silicon-carbon negative electrode, pure silicon negative electrode, lithium metal negative electrode, alloy negative electrode and other negative electrode materials. In addition, batteries such as solid-state lithium-ion batteries, solid-state lithium metal batteries, and lithium-sulfur batteries can also be used as the battery selection for the second battery module 21.

[0058] Optionally, the battery cell structure of the second battery module 21 aims to improve the rate performance and reduce the internal resistance of the battery. Its internal resistance value during battery testing is less than or equal to 0.001 Ω, including, but not limited to, blade battery structure, square shell battery structure, soft pack battery structure, cylindrical battery structure and other structures.

[0059] According to the power battery system 10 of the embodiment of the present invention, by setting two independent battery devices, namely the first battery device and the second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to the power supply signal. The second battery device serves as an additional power source to supply the required power to the drive system to meet the normal operation of the drive system. At the same time, the functional characteristics of the dual battery devices can also be designed separately, enabling them to bear the power output under different working conditions respectively. After being combined at the level of the power battery system 10, the comprehensive improvement of the endurance and power performance is achieved, thereby reducing the pressure on material development and battery cell design for the performance balance improvement of a single battery system.

[0060] Next, refer to Figure 4 to describe the vehicle 11 of the embodiment of the present invention.

[0061] As Figure 4 shown, the vehicle 11 of the embodiment of the present invention includes the power battery system 10 of the above embodiment.

[0062] According to the vehicle 11 of the embodiment of the present invention, by setting two independent battery devices, namely the first battery device and the second battery device, when the required power provided by the first battery device exceeds the upper limit value, the second battery device is started according to the power supply signal. The second battery device serves as an additional power source to supply the required power to the drive system to meet the normal operation of the drive system. At the same time, the functional characteristics of the dual battery devices can also be designed separately, enabling them to bear the power output under different working conditions respectively. After being combined at the level of the power battery system 10, the comprehensive improvement of the endurance and power performance is achieved, thereby reducing the pressure on material development and battery cell design for the performance balance improvement of a single battery system.

[0063] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0064] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A power battery system, characterized in that: include: A first battery device, for providing required power to a driving system of the vehicle; The second battery device is connected to the first battery device and is used to replenish the required power according to the power replenishment signal.

2. The power battery system according to claim 1, characterized in that: The first battery device comprises: a first battery module, wherein a positive electrode of the first battery module is connected to one end of the drive system, and a negative electrode of the first battery module is connected to the other end of the drive system, and is used to output a supply current and a supply voltage to provide the required power to the drive system; A first current sampling module, one end of which is connected to the negative electrode of the first battery module, and the other end of which is connected to the other end of the drive system, is used to collect the power supply current.

3. The power battery system according to claim 1, characterized in that: The second battery device comprises: a second battery module, wherein a positive electrode of the second battery module is connected to one end of the drive system, and a negative electrode of the second battery module is connected to the other end of the drive system, and is used to output a supply current and a supply voltage to supply the required power to the drive system; A second current sampling module, one end of which is connected to the positive electrode of the second battery module, and the other end of which is connected to one end of the drive system, is used to collect the current and value of the supplementary power supply current and the power supply current.

4. The power battery system according to claim 3, characterized in that: The second battery device further comprises: A control switch, wherein the first end of the control switch is connected to the negative electrode of the second battery module, the second end of the control switch is connected to the other end of the drive system, and the control end of the control switch is connected to the control module of the power battery system, and is used to conduct the power supply circuit between the second battery module and the drive system when the power supply current is greater than the current upper limit.

5. The power battery system according to claim 3, characterized in that: The second battery device further comprises: A control switch, wherein a first end of the control switch is connected to the negative electrode of the second battery module, a second end of the control switch is connected to the other end of the drive system, and a control end of the control switch is connected to the control module of the power battery system, and is used to shut off the power supply circuit between the second battery module and the drive system when the power supply current is less than or equal to the current upper limit value.

6. The power battery system according to claim 3, characterized in that: The second battery device further comprises: A boost module is provided in a power supply circuit for supplying the required power to the drive system, and is used to adjust the supply voltage of the second battery module until the supply voltage of the second battery module is equal to the supply voltage of the first battery module.

7. The power battery system according to claim 1, characterized in that: A difference between the number of battery cells in the first battery device and the number of battery cells in the second battery device is less than a preset number.

8. The power battery system according to claim 1, characterized in that: The power battery system further includes: A control module is connected to the first battery device and the second battery device respectively, and is used to turn on or off a control switch according to power requirements of the drive system.

9. The power battery system according to claim 1, characterized in that: The first battery module includes high-energy power batteries, and the second battery module includes high-density power batteries.

10. A vehicle, characterized in that: include: A power battery system as claimed in any one of claims 1 to 9.

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