Control method for integrated lithium battery system with energy and power cells over a wide temperature range

Abstract

The present invention provides a control method for an energy-type and power-type battery cell integrated lithium battery system with a wide temperature range, which belongs to the field of lithium battery energy storage technology. By introducing a main switch, a MOS switch and an inductor element into an energy-type and power-type battery cell integrated lithium battery system with a wide temperature range, the auxiliary output of the low-temperature battery and the heating of the lithium battery are coordinated and unified, which greatly simplifies the control method of auxiliary control and mutual heating. When the MOS switch is not in operation, the control method of the present invention can supply power in parallel with a battery pack composed of energy-type batteries and a battery pack composed of power-type batteries in parallel. When the switch is in operation, the power-type battery cell can not only realize auxiliary output, but also charge each other with the energy-type battery cell, forming a majority of power-type batteries in series during the boost process, passively charging and heating a minority of energy-type batteries in series, and using PWM signal control to ensure efficient and stable operation of the system. The control of the present invention is simpler and has better effects.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery energy storage, and in particular relates to a control method for a lithium battery system integrating energy-type and power-type cells over a wide temperature range. Background Art

[0002] Conventional lithium batteries will experience capacity loss, increased electrolyte viscosity, accelerated aging, and safety issues when used at low temperatures. The superior performance of low-temperature lithium batteries in low-temperature environments makes them of great use value in extremely cold regions and special applications. However, the energy storage density of low-temperature lithium batteries is not as good as that of normal-temperature lithium-ion batteries. Therefore, a hybrid energy storage system can be formed by combining low-temperature lithium battery cells with conventional lithium battery cells to improve the comprehensive performance of the lithium battery system. In addition, while the low-temperature lithium battery assists in output, it can also be used for heating to ensure the working performance of the conventional lithium battery.

[0003] Existing lithium battery pack heating technologies can be mainly divided into two categories according to the energy supply method: internal heating and external heating. Compared with external heating, the internal heating method has a faster temperature rise rate, more stable heating consistency, and lower heat-induced aging stress. The internal heating method is further divided into AC heating and DC heating methods, and regular charge and discharge AC heating has the advantages of rapid temperature rise, simple implementation, and effective improvement of battery performance at low temperatures.

[0004] At present, most low-temperature battery auxiliary output and heating control are independent of each other, which is not only inefficient, but also more complicated. Therefore, it is very important to design a hybrid energy storage system with different types of lithium battery cells, coordinate the low-temperature battery auxiliary output and lithium battery heating through the circuit structure, and simplify the control method. This type of hybrid energy storage system and control method of different types of lithium battery cells will be more suitable for wide temperature range working environment and complex working conditions. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a control method for an energy-type and power-type cell integrated lithium battery system with a wide temperature range. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] The present invention provides a control method for a wide temperature range energy type and power type battery cell integrated lithium battery system, which is applied to a wide temperature range energy type and power type battery cell integrated lithium battery system, the system comprising: a plurality of energy type battery cells, a plurality of power type battery cells and two main switches, each energy type battery cell and each power type battery cell are correspondingly connected with a MOS switch and an inductor, the control method comprising:

[0007] Control the conduction mode of the two main switches and all MOS switches to put the wide temperature range energy type and power type battery cell integrated lithium battery system in parallel power supply mode or mutual charging mode; when the wide temperature range energy type and power type battery cell integrated lithium battery system is in mutual charging mode, pass PWM signals to the conducting MOS tubes to control the charging mode of multiple power type batteries and multiple energy type batteries;

[0008] Among them, in the parallel power supply mode, multiple energy type batteries and multiple power type batteries form a battery pack to jointly supply power to the DC load; in the mutual charging mode, the charging method of multiple power type batteries and multiple energy type batteries is: multiple power type batteries charge multiple energy type batteries, or multiple energy type batteries charge multiple power type batteries.

[0009] Beneficial effects:

[0010] The present invention provides a control method for an energy-type and power-type battery cell integrated lithium battery system with a wide temperature range. By introducing a main switch, a MOS switch and an inductor element into the energy-type and power-type battery cell integrated lithium battery system with a wide temperature range, the auxiliary output of the low-temperature battery and the heating of the lithium battery are coordinated and unified, which greatly simplifies the control method of auxiliary control and mutual heating. In the control method of the present invention, when the MOS switch is not in operation, the battery pack composed of the energy-type battery cell and the battery pack composed of the power-type battery cell in parallel can be connected in parallel for power supply. When the switch is in operation, the power-type battery cell can not only realize auxiliary output, but also charge each other with the energy-type battery cell. In the process of boosting, passive charging and heating of a few series-connected energy-type battery cells by a majority of series-connected power-type battery cells can be formed, and the PWM signal control with a small duty cycle can ensure efficient and stable operation of the system. Compared with traditional auxiliary output and charging heating methods, the present invention has simpler control and better effect. The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of a wide temperature range energy-type and power-type cell integrated lithium battery system provided by an embodiment of the present invention;

[0012] Figure 2 A schematic diagram of the switching modes of the main switches S1 and S2 and the power flow path of the integrated lithium battery system provided by an embodiment of the present invention in a parallel power supply mode;

[0013] Figure 3 A schematic diagram of the MOS switch mode of the first module, the switch modes of the main switches S1 and S2, and the power flow path of the integrated lithium battery system provided by an embodiment of the present invention in the mutual power supply mode;

[0014] Figure 4A schematic diagram of the MOS switch mode of the second module, the switch modes of the main switches S1 and S2, and the power flow path of the integrated lithium battery system provided by an embodiment of the present invention in the mutual power supply mode;

[0015] Figure 5 A schematic diagram of the MOS switch mode of the third module, the switch modes of the main switches S1 and S2, and the power flow path of the integrated lithium battery system provided by an embodiment of the present invention in the mutual power supply mode;

[0016] Figure 6 A schematic diagram of the MOS switch mode of the nth module, the switch modes of the main switches S1 and S2, and the power flow path of the integrated lithium battery system provided by an embodiment of the present invention in the mutual power supply mode. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0018] Combination Figures 1 to 6 The present invention provides a control method for a wide temperature range energy-type and power-type battery cell integrated lithium battery system, which is applied to a wide temperature range energy-type and power-type battery cell integrated lithium battery system. The system includes: multiple energy-type battery cells, multiple power-type battery cells and two main switches, and a MOS switch and an inductor are correspondingly connected between each energy-type battery cell and each power-type battery cell.

[0019] It is worth noting that the energy-type battery cell of the present invention is a conventional lithium battery, and the power-type battery cell is a low-temperature lithium battery. The rated voltages of the two are equal or the maximum voltages are equal, but the rated capacities may be unequal, wherein the capacity of the power-type battery cell is much less than that of the energy-type battery cell due to auxiliary output and heating; the power-type battery cell is a nickel-cobalt-manganese ternary lithium battery with a low-viscosity, high-conductivity electrolyte; the energy-type battery cell is a conventional lithium iron phosphate battery; wherein the lithium batteries corresponding to the power-type battery cell and the energy-type battery cell can be replaced by other types of low-temperature lithium batteries and high-energy-density lithium batteries, respectively.

[0020] A control method for a wide temperature range energy-type and power-type cell integrated lithium battery system provided by the present invention comprises:

[0021] Control the conduction mode of the two main switches and all MOS switches to put the wide temperature range energy type and power type battery cell integrated lithium battery system in parallel power supply mode or mutual charging mode; when the wide temperature range energy type and power type battery cell integrated lithium battery system is in mutual charging mode, pass PWM signals to the conducting MOS tubes to control the charging mode of multiple power type batteries and multiple energy type batteries;

[0022] Among them, in the parallel power supply mode, multiple energy cells and multiple power cells form a battery pack to jointly supply power to the DC load; in the mutual charging mode, multiple power cells and multiple energy cells are charged in the following manner: multiple power cells charge multiple energy cells, or multiple energy cells charge multiple power cells. The rated voltage or maximum voltage of each energy cell is the same as that of the corresponding power cell.

[0023] When supplying power under low temperature conditions, power cells (low-temperature lithium batteries) are used for auxiliary control and mutual heating. At this time, the main switch S1 is closed and turned on, and the main switch S2 is turned off. Since the capacity of the corresponding power cell is much less than that of the energy cell, its voltage drops faster. Therefore, the boost function is needed to output energy to replenish the power or heat the energy cell.

[0024] Combination Figures 1 to 6 The wide temperature range energy-type and power-type battery cell integrated lithium battery system of the present invention comprises: n energy-type battery cells, n power-type battery cells, n first MOS switches, n second MOS switches, n inductors and two main switches;

[0025] Among them, the negative electrode of the first energy-type battery cell is connected to the source electrode of the first first MOS switch, the negative electrode of the first power-type battery cell and the negative electrode of the DC load; the positive electrode of the first energy-type battery cell is connected to the drain electrode of the first second MOS switch and the negative electrode of the second energy-type battery cell; the source electrode of the first second MOS switch is connected to the first end of the first inductor, the drain electrode of the first first MOS switch and the source electrode of the second first MOS switch; the second end of the first inductor is connected to the positive electrode of the first power-type battery cell and the negative electrode of the second power-type battery cell; The negative electrode of the n-1 energy-type battery cell is connected to the positive electrode of the n-1 power-type battery cell and the drain of the n-1 second MOS switch; the positive electrode of the n-1 energy-type battery cell is connected to the drain of the n-1 second MOS switch and the first end of the first main switch; the source of the n-2 second MOS switch is connected to the first end of the n-2 inductor and the drain of the n-2 first MOS switch; the second end of the n-2 inductor is connected to the second end of the second main switch and the positive electrode of the n-1 power-type battery cell; the second end of the first main switch is connected to the first end of the second main switch and the positive electrode of the DC load;

[0026] The negative electrode of the i-th energy type battery cell is connected to the positive electrode of the i-1-th energy type battery cell and the drain of the i-1-th second MOS switch; the positive electrode of the i-th energy type battery cell is connected to the drain of the i-th second MOS switch and the negative electrode of the i+1-th energy type battery cell; the source of the i-th second MOS switch is connected to the first end of the i-th inductor, the drain of the i-th first MOS switch, and the source of the i+1-th first MOS switch; the second end of the i-th inductor is connected to the positive electrode of the i-th power type battery cell and the negative electrode of the i+1-th power type battery cell, where i ranges from 2 to n-1, and n is a positive integer.

[0027] refer to Figures 1 to 6 , the n energy type cells are C1~Cn, the n power type cells are G1~Gn, the n first MOS switches are SW1~SWn, the n second MOS switches are SW11~SWnn, the n inductors are L1~Ln, the first main switch is S1, and the second main switch is S2.

[0028] In an optional embodiment of the present invention, controlling the conduction mode of two main switches and all MOS switches so that the wide temperature range energy type and power type cell integrated lithium battery system is in parallel power supply mode includes:

[0029] The first main switch and the second main switch are both closed and turned on, and all MOS switches are turned off, so that the wide temperature range energy type and power type cell integrated lithium battery system is in parallel power supply mode;

[0030] In the parallel power supply mode, each power cell is connected in parallel at both ends of the corresponding energy cell through the connected inductor to form a battery pack, and the DC load is powered by the battery pack.

[0031] refer to Figure 2 When the power is supplied at normal or high temperature, all MOS switches will not operate and remain off. The mth power cell Gm will be connected in parallel to the corresponding energy cell Cm through the inductor Lm to form a passive power supplement mode, which effectively alleviates the impact of high power on the energy cell Cm during startup. To increase the current output, the main switches S1 and S2 can be closed and turned on. At this time, the energy cells C1~Cn form a closed loop with the DC load, and G1~Gn also form a closed loop with the DC load, that is, the battery pack composed of energy cells and the battery pack composed of power cells in parallel are connected in parallel for power supply.

[0032] Continue to refer Figures 1 to 6 , controlling the conduction mode of the two main switches and all MOS switches so that the wide temperature range energy type and power type cell integrated lithium battery system are in mutual charging mode, including:

[0033] Control the first main switch to close and turn on, and the second main switch to turn off;

[0034] A PWM signal with a predetermined duty cycle is input into the gates of the mth first MOS switch and the mth second MOS switch in turn, and the remaining MOS switches are turned off to put the energy-type and power-type cell integrated lithium battery system with a wide temperature range into a mutual charging mode, where m takes a value from 1 to n.

[0035] The predetermined duty cycle is 30%. For each first MOS switch, during the time period when the gate of the first MOS switch inputs a PWM signal with a predetermined duty cycle, the remaining first MOS switches and all second MOS switches are not turned on; for each second MOS switch, during the time period when the gate of the second MOS switch inputs a PWM signal with a predetermined duty cycle, all first MOS switches and the remaining second MOS switches are not turned on. In the mutual charging mode, multiple power cells are also used to provide auxiliary power supply to the DC load.

[0036] In order to conveniently explain the mutual charging process of each energy type and power type battery cell in the mutual charging mode, the present invention explains the switching process of the mutual charging mode according to the module. The mth first MOS switch, the mth second MOS switch, the mth energy type battery cell and the mth power type battery cell are used as the mth module, the first main switch S1 is closed and turned on, and the second main switch S2 is turned off, and then a PWM signal with a predetermined duty cycle is input to the gate of the mth first MOS switch and the mth second MOS switch, and the remaining MOS switches are turned off, so that the energy type and power type battery cell integrated lithium battery system with a wide temperature range is in the mutual charging mode, and in the mutual charging mode, the mth energy type battery cell and the mth power type battery cell are charged with each other, and the first m-1 power type batteries or energy type batteries connected in series are also charged with each other.

[0037] In a specific embodiment of the present invention, sequentially inputting a PWM signal with a predetermined duty cycle to the gate of the mth first MOS switch and the mth second MOS switch, and turning off the remaining MOS switches, so that the wide temperature range energy type and power type cell integrated lithium battery system is in a mutual charging mode includes:

[0038] When m is 1, a PWM signal with a predetermined duty cycle is passed through the gate of the first MOS switch and the remaining MOS switches are turned off, so that the first power cell is boosted to charge the first energy cell;

[0039] The PWM signal is switched from the gate of the first MOS switch to the gate of the first second MOS switch, and a PWM signal with a predetermined duty cycle is passed to reduce the voltage of the first energy cell and charge the first power cell.

[0040] Continuing with the above description of the module, the first MOS switch, the first second MOS switch, the first energy-type battery cell and the first power-type battery cell are taken as the first module. Figure 3 First, the MOS switch of the first module is operated, and a PWM signal with a small duty cycle is passed to the MOS switch SW1, and other MOS switches are turned off. At this time, the power cell G1 is boosted by the parasitic diode SW11 to charge the energy cell C1, and the power cell G1 is combined with C2~Cn to discharge the DC load. Figure 3 As shown by the closed dotted line on the right side of the figure; after a short delay, the first MOS switch SW1 is turned off, and a PWM signal with a smaller duty cycle is passed to the second MOS switch SW11, and other MOS switches are also turned off. Since the power cell G1 is boosted to charge the energy cell C1, the energy cell C1 is stepped down by the MOS switch SW11 to charge the power cell G1, and C1~Cn discharge the DC load; when other MOS switches are turned off, by passing a PWM signal with a smaller duty cycle to the first MOS switch SW1 and the second MOS switch SW11 in turn, the energy cell C1 and the power cell G1 are charged and discharged back and forth to achieve rapid mutual heating of the two cells, and when heating each other, the power cell can also provide auxiliary power supply without affecting the power supply of the main circuit.

[0041] In a specific embodiment of the present invention, sequentially inputting a PWM signal with a predetermined duty cycle to the gate of the mth first MOS switch and the mth second MOS switch, and turning off the remaining MOS switches, so that the wide temperature range energy type and power type cell integrated lithium battery system is in a mutual charging mode includes:

[0042] When m is 2 to n, a PWM signal with a predetermined duty cycle is applied to the gate of the mth first MOS switch, and the remaining MOS switches are turned off, so that the mth first MOS switch is turned on during a high level period of the PWM signal and turned off during a low level period;

[0043] Among them, when the mth first MOS switch is turned on during the high level period of the PWM signal, the 1st to mth power type cells connected in series are boosted, and the 1st to m-1th energy type cells connected in series are charged; when the mth first MOS switch is turned off and turned on during the low level period, the 1st to mth power type cells connected in series are boosted, and the 1st to mth energy type cells connected in series are charged;

[0044] The PWM signal is switched from the gate of the mth first MOS switch to the gate of the mth second MOS switch, and a PWM signal with a predetermined duty cycle is passed to reduce the voltage of the 1st to mth energy-type cells in series and charge the 1st to mth power-type cells in series.

[0045] refer to Figure 4 , when m is 2, turn off MOS switch SW11, operate the MOS switch of the second module, pass a PWM signal with a smaller duty cycle to MOS switch SW2, and other MOS switches are also turned off. During the high-level period when MOS switch SW2 passes the PWM signal, MOS switch SW2 is turned on, and the power cells G1-G2 connected in series charge the energy cells C1 through MOS switch SW2, and the power cells G1~G2 discharge to the DC load through the SW22 parasitic diode and the energy cells C2~Cn; during the low-level period when MOS switch SW2 passes the PWM signal, MOS switch SW2 is turned off and does not conduct. At this time, the power cells G1-G2 connected in series are boosted through the SW22 parasitic diode to charge the energy cells C1~C2 connected in series, and G1~G2 discharge to the DC together with C3~Cn, such as Figure 4 After a short delay, the MOS switch SW2 is turned off, and a PWM signal with a small duty cycle is passed to the MOS switch SW22. Other MOS switches are also turned off. At this time, the energy cells C1-C2 in series are stepped down by the MOS switch SW22 to charge the power cells G1-G2 in series. Figure 4 As shown by the closed dotted line on the left side, C1~Cn discharge the DC load; when other MOS switches are closed, by passing PWM signals with smaller duty cycles to MOS switches SW2 and SW22 in turn, the power cells G1 and G2 are connected in series and then charge and discharge with the energy cells C1 and C2, thereby achieving mutual heating. During mutual heating, the power cells can also provide auxiliary power supply without affecting the power supply of the main circuit.

[0046] refer to Figure 5 , when m is 3, turn off MOS switch SW22, operate the MOS switch of the third module, pass a PWM signal with a smaller duty cycle to MOS switch SW3, and the other MOS switches are also turned off. During the high level period of the PWM signal passed by MOS switch SW3, MOS switch SW3 is turned on, and the power cells G1-G3 connected in series are charged to the energy cells C1-C2 connected in series through MOS switch SW3, and G1~G3 discharges to the DC load through MOS switch SW3 and C3~Cn; during the low level period of the PWM signal passed by MOS switch SW3, MOS switch SW3 is turned off and not turned on, and the power cells G1-G3 connected in series are charged to the energy cells C1-C3 connected in series through the parasitic diode boost of MOS switch SW33, and G1~G3 discharges to the DC load through C4~Cn. Figure 5As shown by the closed dotted line on the right side of the figure; after a period of time, the MOS switch SW3 is turned off, and a PWM signal with a smaller duty cycle is passed to the MOS switch SW33, the MOS switch SW33 is turned on, and the other MOS switches are also turned off. At this time, the energy type cells C1-C3 connected in series are stepped down by the MOS switch SW33 to charge the power type cells G1-G3 connected in series, as shown in FIG. Figure 5 As shown by the closed dotted line on the left side of the figure; C1~Cn discharges the DC load, such as Figure 5 As shown by the closed dotted line on the right side of the figure; when other MOS switches are turned off, by sequentially passing PWM signals with smaller duty cycles to MOS switches SW3 and SW33, the power cells G1-G3 connected in series will charge and discharge with the energy cells C1-C3 to achieve mutual heating, and when heating each other, the power cells can also provide auxiliary power supply without affecting the power supply of the main circuit.

[0047] refer to Figure 6 When m is equal to n, the MOS switches of the nth module are operated in turn, that is, the MOS switches SWn and SWnn are passed with small duty cycle PWM signals in turn. When the MOS switches SWn and SWnn are passed with small duty cycle PWM signals, other MOS switches are turned off, so that the first n power cells are connected in series and the corresponding energy cells are charged and discharged with each other, and when they heat each other, the power cells can also provide auxiliary power supply without affecting the power supply of the main circuit.

[0048] In a specific embodiment of the present invention, in the mutual charging mode, the power type battery cells and the energy type battery cells heat each other by mutual charging and discharging until the temperature of the battery pack formed is higher than the set temperature, and then the conduction mode of the two main switches and all MOS switches is controlled to switch the wide temperature range energy type and power type battery cell integrated lithium battery system from the mutual charging mode to the parallel power supply mode.

[0049] It is worth noting that the present invention uses a PWM signal with a smaller duty cycle to control the MOS switch, otherwise it will cause the inductor voltage to be too high and over-limit, resulting in increased energy loss of the power cell, and even overheating and crash of the lithium battery energy storage system during the heating process. After the operation of the last module is completed, the PWM signal operation with a smaller duty cycle is repeated on the corresponding MOS switch from the first module until the battery pack temperature is higher than the set temperature and the power cell and energy cell are heated mutually. At this time, it is switched to the conventional parallel power supply mode.

[0050] The present invention provides a control method for an energy-type and power-type battery cell integrated lithium battery system with a wide temperature range. By introducing a main switch, a MOS switch and an inductor element into the energy-type and power-type battery cell integrated lithium battery system with a wide temperature range, the low-temperature battery auxiliary output and the lithium battery heating are coordinated and unified, which greatly simplifies the control method of auxiliary control and mutual heating. When the MOS switch is not in operation, the control method of the present invention can supply power in parallel with a battery pack composed of energy-type batteries and a battery pack composed of power-type batteries in parallel. When the switch is in operation, the power-type battery cell can not only realize auxiliary output, but also charge each other with the energy-type battery cell, forming a majority of series-connected power-type batteries in the process of boosting, passively charging and heating a minority of series-connected energy-type batteries, and using PWM signal control to ensure efficient and stable operation of the system. Compared with traditional auxiliary output and charging heating methods, the present invention has simpler control and better effects.

[0051] It is worth noting that the terms "first" and "second" in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality of components or steps.

[0053] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A control method for a wide temperature range energy type and power type cell integrated lithium battery system, characterized in that: The invention is applied to a lithium battery system integrating energy-type and power-type cells in a wide temperature range. The system comprises: a plurality of energy-type cells, a plurality of power-type cells and two main switches. A MOS switch and an inductor are connected between each energy-type cell and each power-type cell. The control method comprises: Controlling the conduction mode of the two main switches and all MOS switches so that the wide temperature range energy-type and power-type battery cell integrated lithium battery system is in a parallel power supply mode or a mutual charging mode; when the wide temperature range energy-type and power-type battery cell integrated lithium battery system is in a mutual charging mode, a PWM signal is passed to the conducting MOS tube to control the charging mode of the multiple power-type battery cells and the multiple energy-type battery cells; Among them, in the parallel power supply mode, the multiple energy-type batteries and the multiple power-type batteries form a battery pack to jointly supply power to the DC load; in the mutual charging mode, the multiple power-type batteries and the multiple energy-type batteries are charged in the following manner: the multiple power-type batteries charge the multiple energy-type batteries, or the multiple energy-type batteries charge the multiple power-type batteries; The wide temperature range energy-type and power-type battery cell integrated lithium battery system comprises: n energy-type battery cells, n power-type battery cells, n first MOS switches, n second MOS switches, n inductors and two main switches; Among them, the negative electrode of the first energy-type battery cell is connected to the source electrode of the first first MOS switch, the negative electrode of the first power-type battery cell and the negative electrode of the DC load; the positive electrode of the first energy-type battery cell is connected to the drain electrode of the first second MOS switch and the negative electrode of the second energy-type battery cell; the source electrode of the first second MOS switch is connected to the first end of the first inductor, the drain electrode of the first first MOS switch and the source electrode of the second first MOS switch; the second end of the first inductor is connected to the positive electrode of the first power-type battery cell and the negative electrode of the second power-type battery cell; the nth The negative electrode of the energy-type battery cell is connected to the positive electrode of the n-1th power-type battery cell and the drain of the n-1th second MOS switch; the positive electrode of the nth energy-type battery cell is connected to the drain of the nth second MOS switch and the first end of the first main switch; the source of the nth second MOS switch is connected to the first end of the nth inductor and the drain of the nth first MOS switch; the second end of the nth inductor is connected to the second end of the second main switch and the positive electrode of the nth power-type battery cell; the second end of the first main switch is connected to the first end of the second main switch and the positive electrode of the DC load; The negative electrode of the i-th energy type battery cell is connected to the positive electrode of the i-1-th energy type battery cell and the drain of the i-1-th second MOS switch; the positive electrode of the i-th energy type battery cell is connected to the drain of the i-th second MOS switch and the negative electrode of the i+1-th energy type battery cell; the source of the i-th second MOS switch is connected to the first end of the i-th inductor, the drain of the i-th first MOS switch, and the source of the i+1-th first MOS switch; the second end of the i-th inductor is connected to the positive electrode of the i-th power type battery cell and the negative electrode of the i+1-th power type battery cell, where i ranges from 2 to n-1, and n is a positive integer.

2. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 1, characterized in that: The rated voltage or maximum voltage of each energy-type battery cell is the same as that of the corresponding power-type battery cell.

3. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 1, characterized in that: The controlling the conduction mode of the two main switches and all MOS switches so that the wide temperature range energy type and power type cell integrated lithium battery system is in a parallel power supply mode includes: The first main switch and the second main switch are closed and turned on, and all MOS switches are turned off, so that the wide temperature range energy type and power type cell integrated lithium battery system is in a parallel power supply mode; In the parallel power supply mode, each power cell is connected in parallel at both ends of the corresponding energy cell through the connected inductor to form a battery pack, and the DC load is powered by the battery pack.

4. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 1, characterized in that: The controlling the conduction mode of the two main switches and all MOS switches so that the wide temperature range energy type and power type cell integrated lithium battery system is in a mutual charging mode includes: Control the first main switch to close and turn on, and the second main switch to turn off; A PWM signal with a predetermined duty cycle is input into the gates of the mth first MOS switch and the mth second MOS switch in sequence, and the remaining MOS switches are turned off, so that the wide temperature range energy-type and power-type cell integrated lithium battery system is in a mutual charging mode, and the value of m ranges from 1 to n.

5. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 4, characterized in that: The step of sequentially inputting a PWM signal with a predetermined duty cycle to the gates of the mth first MOS switch and the mth second MOS switch, and turning off the remaining MOS switches, so that the wide temperature range energy-type and power-type cell integrated lithium battery system is in a mutual charging mode comprises: When m is 1, a PWM signal with a predetermined duty cycle is passed through the gate of the first MOS switch and the remaining MOS switches are turned off, so that the first power cell is boosted to charge the first energy cell; The PWM signal is switched from the gate of the first MOS switch to the gate of the first second MOS switch, and a PWM signal with a predetermined duty cycle is passed to reduce the voltage of the first energy-type battery cell and charge the first power-type battery cell.

6. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 4, characterized in that: The step of sequentially inputting a PWM signal with a predetermined duty cycle to the gates of the mth first MOS switch and the mth second MOS switch, and turning off the remaining MOS switches, so that the wide temperature range energy-type and power-type cell integrated lithium battery system is in a mutual charging mode comprises: When m is 2 to n, a PWM signal with a predetermined duty cycle is applied to the gate of the mth first MOS switch, and the remaining MOS switches are turned off, so that the mth first MOS switch is turned on during a high level period of the PWM signal and turned off during a low level period; Wherein, when the mth first MOS switch is turned on during the high level period of the PWM signal, the 1st to mth power type cells connected in series are boosted, and the 1st to m-1th energy type cells connected in series are charged; when the mth first MOS switch is turned off and turned on during the low level period, the 1st to mth power type cells connected in series are boosted, and the 1st to mth energy type cells connected in series are charged; The PWM signal is switched from the gate of the mth first MOS switch to the gate of the mth second MOS switch, and a PWM signal with a predetermined duty cycle is passed to reduce the voltage of the 1st to mth energy-type cells connected in series and charge the 1st to mth power-type cells connected in series.

7. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 4, characterized in that: For each first MOS switch, during a time period when a PWM signal with a predetermined duty cycle is input to the gate of the first MOS switch, the remaining first MOS switches and all the second MOS switches are not turned on; For each second MOS switch, during a time period when a PWM signal with a predetermined duty cycle is input to the gate of the second MOS switch, all the first MOS switches and the remaining second MOS switches are not turned on.

8. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 1, characterized in that: In the mutual charging mode, the plurality of power cells are also used to provide auxiliary power to the DC load.

9. The control method of the wide temperature range energy type and power type cell integrated lithium battery system according to claim 1, characterized in that: In the mutual charging mode, the power type battery cell and the energy type battery cell heat each other through mutual charging and discharging until the temperature of the battery pack is higher than the set temperature, and then the conduction mode of the two main switches and all MOS switches is controlled to switch the wide temperature range energy type and power type battery cell integrated lithium battery system from the mutual charging mode to the parallel power supply mode.

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