Energy storage battery system

Abstract

The utility model provides an energy storage battery system which comprises a plurality of groups of battery cells, heating films and hollow cooling partition plates are sequentially and alternately arranged between every two adjacent groups of battery cells, the cooling partition plates are hollow, an air duct inlet and an air duct outlet are formed in the two ends of each cooling partition plate respectively, and a hollow blowing plate is arranged on one side of each battery cell. One side of the blowing plate is connected with air blowing equipment, and the blowing plate is provided with an output air port communicated with the air duct inlet; the surface of the cooling partition plate is provided with a plurality of hollowed-out holes changing in a gradient mode, the hole diameters and the number of the hollowed-out holes are gradually increased in the direction from the air channel inlet to the air channel outlet, the uniform air-cooling temperature control process can be achieved, the cooling capacity is improved through the arranged hollowed-out holes, meanwhile, a plurality of voltage grades are achieved, and the charging and discharging processes under different requirements are met.

Description

Technical Field

[0001] This utility model belongs to the technical field of power and energy storage batteries, and specifically relates to an energy storage battery system. Background Technology

[0002] Existing battery system temperature control methods mainly include air cooling and liquid cooling. Air cooling has a series of obvious advantages over liquid cooling, such as low cost, no risk of leakage, and lightweight, making it suitable for electric vehicles and energy storage systems. However, the main disadvantage of air cooling is that air has low specific heat and is heated immediately after flowing into the battery pack, resulting in a significant temperature difference between the front and back ends of the air duct, which is detrimental to the battery system's lifespan and performance.

[0003] Furthermore, battery systems are used in a variety of scenarios, requiring a wide voltage range, from several volts to several hundred volts. Common charging and discharging devices include: low-voltage starting power supplies and portable electronic devices; medium-voltage light electric vehicles and household appliances; and high-voltage large electric vehicles, charging stations, and other special equipment. In some cases, the voltage of the battery cell changes significantly during charging and discharging, causing incompatibility issues. Traditional battery systems require expensive electromagnetic induction transformer components to achieve wide voltage matching, and these transformer components suffer significant energy loss under high-power conditions.

[0004] In summary, existing battery systems suffer from problems such as short lifespan, poor temperature control, high cost, and severe energy loss. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides an energy storage battery system to solve the problems mentioned in the background art.

[0006] In a first aspect, the present invention provides the following technical solution: an energy storage battery system, comprising a plurality of battery cells, wherein a heating film and a cooling partition are alternately arranged between adjacent groups of battery cells, the cooling partition is hollow and has an air duct inlet and an air duct outlet at both ends, a hollow blowing plate is provided on one side of the battery cell, a blower is connected to one side of the blowing plate, and an output air outlet is provided on the blowing plate that communicates with the air duct inlet;

[0007] The surface of the cooling baffle is provided with a number of perforated holes in a gradient manner. The diameter and number of the perforated holes increase along the direction from the air duct inlet to the air duct outlet.

[0008] Compared with the prior art, the beneficial effects of this application are as follows: This utility model achieves uniform heat dissipation of the battery cell by forcing air flow within the cooling baffle through a blower, and simultaneously heating the battery cell with a heating film. This achieves a highly efficient and low-cost air-cooling temperature control process for the battery cell. Furthermore, the cooling baffle has several gradient-distributed perforations. At the perforations, the battery cell is in direct contact with the cold air, resulting in significant heat exchange. At locations without perforations, the battery cell is separated from the cold air by the outer wall of the cooling baffle, hindering heat exchange and maintaining the low temperature of the air. Near the air duct inlet, the air temperature is low and the heat exchange capacity is high. A small number of perforations with small diameters are provided. Along the air flow direction, the cold air is gradually heated, and the heat exchange capacity decreases. Therefore, more perforations with larger diameters are provided at the air duct outlet to improve cooling capacity and ensure the temperature uniformity of the battery cell.

[0009] Preferably, the battery cell has tabs fixed on it.

[0010] Preferably, the air duct outlet is located on the side of the cooling baffle closer to the tab.

[0011] Preferably, the heating film and the cooling partition are attached to the outer wall of the battery cell.

[0012] Preferably, the battery cell is provided with a first switch group and a second switch group respectively. The first switch group includes a plurality of first switches corresponding to the battery cell, and the second switch group includes a plurality of second switches corresponding to the battery cell. The battery cells are provided with a series circuit and a parallel circuit.

[0013] Preferably, the first switch is disposed in the parallel circuit, and the second switch is disposed between the series circuit and the parallel circuit. The second switch is used to switch the series circuit and the parallel circuit to achieve multi-level voltage switching.

[0014] Preferably, the cooling baffle has alternating flow channel walls, the length of which is less than the length of the cooling baffle, and the height of which is equal to the height of the inner cavity of the cooling baffle.

[0015] Preferably, several support columns are provided on both sides of the flow channel wall.

[0016] Preferably, both the flow channel wall and the support column are inclined, and both the flow channel wall and the support column are made of elastic material.

[0017] Preferably, the first switch is a single-pole single-throw switch, and the second switch is a single-pole double-throw switch. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a perspective view of the energy storage battery system provided in Embodiment 1 of this utility model;

[0020] Figure 2 This is a perspective view of the energy storage battery system provided in Embodiment 1 of this utility model.

[0021] Figure 3 This is a structural diagram of the blow plate provided in Embodiment 1 of this utility model;

[0022] Figure 4 This is a structural diagram of the second switch group provided in Embodiment 1 of this utility model;

[0023] Figure 5 This is a structural diagram of the cooling baffle provided in Embodiment 1 of this utility model;

[0024] Figure 6 This is a structural diagram of the cooling baffle from another perspective provided in Embodiment 1 of this utility model;

[0025] Figure 7 This is a circuit connection diagram of the battery cell provided in Embodiment 1 of this utility model;

[0026] Figure 8 This is an internal structural diagram of the cooling baffle provided in Embodiment 1 of this utility model;

[0027] Figure 9 This is a perspective view of the energy storage battery system provided in Embodiment 2 of this utility model;

[0028] Figure 10 This is a perspective view of the cooling baffle provided in Embodiment 2 of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030]

[0031] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0036] Example 1

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the first embodiment of this utility model provides an energy storage battery system, including several groups of battery cells 15. A heating film 7 and a cooling partition 6 are alternately arranged between two adjacent groups of battery cells 15. The cooling partition 6 is hollow and has an air duct inlet 10 and an air duct outlet 11 at both ends. A hollow blower 4 is provided on one side of each battery cell 15. A blower 3 is connected to one side of the blower 4. An output air outlet 8 is provided on the blower 4 and communicates with the air duct inlet 10.

[0038] Specifically, each group of cells 15 is composed of several cells 15. Each group of cells 15 represents the physical and positional relationship of the cells 15 within the group. The cells 15 can be lithium-ion, sodium-ion, or other ion batteries. In this embodiment, it has a square structure. In the battery system of this utility model, several groups of cells 15 are arranged sequentially, and heating films 7 and cooling partitions 6 are alternately arranged between adjacent groups of cells 15. The outermost group of cells 15 has a heating film 7 on its outer side. The several groups of cells 15 are arranged in sequence... The sub-numbers are (1), (2), (3), (4), ..., (A-1), (A). The outer sides of the cells 15 in groups (1) and (A) are both heating films 7. The cells 15 in groups (1) and (2) are separated by cooling baffles 6. The cells 15 in groups (2) and (3) are separated by heating films 7. The cells 15 in groups (3) and (4) are separated by cooling baffles 6. And so on. The cells 15 in groups (A-1) are separated by cooling baffles 6. Therefore, it can be seen that the two sides of each group of cells 15 are in contact with heating films 7 and cooling baffles 6 respectively.

[0039] Specifically, during thermal management, if heating is required, the heating film 7 can be used to heat the cells 15 on both sides. If cooling is required, the blower 3 can blow cold air into the blower plate 4. The cold air in the blower plate 4 will enter the cooling partition 6 through the outlet 8 and the air duct inlet 10, thereby cooling the cells on both sides of the cooling partition 6. The heating film 7 between each group of cells 15 converts electrical energy into heat energy, thereby increasing the temperature of the cells 15 when necessary. Each heating film 7 is independent and can be turned on and off separately. The temperature of different areas can be detected by multiple temperature sensors installed in the battery system. During thermal management, if the temperature sensor detects that the local temperature is too low or too high, the heating film 7 in that area will be turned on or off to promote the temperature uniformity of the battery system. The blower plate 4 is installed on one or more surfaces of the battery system. The cold air in the blower plate 4 is pushed to flow through each cooling partition 6, thereby dissipating heat evenly to the cells 15. The blower 3 can be an axial fan or a side-blowing fan.

[0040] like Figure 5 , Figure 6 As shown, the surface of the cooling baffle 6 is provided with a plurality of perforated holes 12 that vary in gradient. Along the direction from the air duct inlet 10 to the air duct outlet 11, the diameter and number of the perforated holes 12 increase.

[0041] Specifically, the perforated holes 12 can be divided into several groups along the direction from the air duct inlet 10 to the air duct outlet 11. The closer to the air duct outlet 11, the more perforated holes 12 there are in each group and the larger the hole diameter. The closer to the air duct inlet 10, the fewer perforated holes 12 there are in each group and the smaller the hole diameter.

[0042] Furthermore, the cooling baffle 6 is made of plastic and is hollow inside. The low thermal conductivity of plastic prevents the cold air from being heated prematurely at the air duct inlet 10, ensuring that the cold air can penetrate deep into the battery system to achieve uniform heat exchange. At the perforated holes 12, the battery cell 15 is in direct contact with the cold air, resulting in significant heat exchange. At locations without perforated holes 12, the battery cell 15 is separated from the cold air by the outer plastic wall, hindering heat exchange and maintaining the low temperature of the air. Near the air duct inlet 10, the air temperature is low and the heat exchange capacity is high. A small number of perforated holes 12 are provided, and their diameter is small. Along the air flow direction, the cold air is gradually heated, and the heat exchange capacity decreases. Therefore, more perforated holes 12 are provided at the air duct outlet 11, and their diameter is increased to improve the cooling capacity and ensure the temperature uniformity of the battery cell. The shape of the perforated holes 12 can be circular, square, or irregular.

[0043] In this embodiment, a tab 2 is fixed on the battery cell 15.

[0044] In this embodiment, the air duct outlet 11 is located on the side of the cooling baffle 6 near the tab 2;

[0045] Specifically, by setting the air outlet 11 on one side close to the tab 2, the airflow output from the air outlet 11 directly blows on the high-heat tab 2 and the connector, achieving efficient heat dissipation and rapid cooling.

[0046] In this embodiment, the heating film 7 and the cooling partition 6 are attached to the outer wall of the battery cell 15;

[0047] Specifically, the heating film 7 and the cooling partition 6 are both in close contact with the outer wall of each battery cell 15, and the shape of the heating film 7 and the cooling partition 6 is adapted to the shape of the outer wall of the battery cell 15. They can be planar or curved.

[0048] like Figure 7 As shown, in this embodiment, the battery cell 15 is provided with a first switch group 5 and a second switch group 9 respectively. The first switch group 5 includes a plurality of first switches 16 corresponding to the battery cell 15, and the second switch group 9 includes a plurality of second switches 17 corresponding to the battery cell 15. The battery cells 15 are connected by a series circuit and a parallel circuit.

[0049] Specifically, in this embodiment, a number of series-connected cells 15 are referred to as a cell group 1. Each cell group 1 represents the electrical connection relationship of the cells 15 in the group, and the cells 15 in each cell group 1 are connected in series sequentially. Therefore, the first switch group 5 and the second switch group 9 are arranged above the cell group 1. The first switch 16 is arranged corresponding to each cell group 1, and the second switch 17 is also arranged corresponding to each cell group 1. The series circuit and the parallel circuit are arranged between two adjacent cell groups 1.

[0050] The first switch 16 is disposed in the parallel circuit, and the second switch 17 is disposed between the series circuit and the parallel circuit. The second switch 17 is used to switch the series circuit and the parallel circuit to realize multi-level voltage switching.

[0051] Specifically, the first switch group 5 and the second switch group 9 are located on the tab side of the battery cell 15. In the connection circuit of each battery cell 15 in the battery system, all the battery cells 15 in each battery cell group 1 are connected in series to form a complete battery cell group 1. For each battery cell group 1, each battery cell group 1 is connected in series end to end to form a series circuit, and the two ends of each battery cell group 1 are connected in parallel to form a parallel circuit. The number of the first switch 16 and the second switch 17 is one less than the number of battery cell groups 1. The first switch 16 is located in the parallel circuit of the battery cell group 1. There is an intersection point between the parallel circuit and the series circuit of the battery cell group 1. This intersection point is the connection position of the second switch 17. Therefore, by using the second switch... Switch 17 can freely choose to connect cell group 1 to a parallel circuit or a series circuit. Therefore, it can be seen that when the second switch 17 is switched to the series circuit, two adjacent cell groups 1 are connected in series, and when the second switch 17 is switched to the parallel circuit, two adjacent cell groups 1 are connected in parallel. It should also be noted that when switching to the series circuit, the corresponding first switch 16 needs to be opened, and when switching to the parallel circuit, the corresponding first switch 16 needs to be closed. The series-parallel relationship of cell group 1 is actually the series-parallel relationship between cell 15. Therefore, when the second switch 17 is switched to the series circuit, two adjacent cell groups 1 are connected in series, and when the second switch 17 is switched to the parallel circuit, two adjacent cell groups 1 are connected in parallel.

[0052] It should be noted that this utility model changes the rated voltage of the entire battery system by dynamically adjusting the connection method between the battery cell group 1, and specifically achieves no less than three rated voltage levels. In actual situations, it can cover a large voltage range and switch quickly to match the rated voltage of various charging and discharging devices, or switch during the charging and discharging process to compensate for the voltage fluctuation of individual battery cells.

[0053] Specifically, the positive terminal of each cell group 1 is connected to the first switch 16, and the negative terminal is connected to the second switch 17. The order and position of the switches can be changed. Highly integrated analog switches such as MOSFETs, relays, chips and other control components are used to achieve the same effect. When the first switch 16 corresponding to a certain cell group 1 is closed, its second switch 17 is simultaneously switched to the corresponding parallel circuit, which can realize the parallel connection between the cell group 1 and its adjacent cell group 1. When the first switch 16 corresponding to a certain cell group 1 is open, its second switch 17 is simultaneously switched to the corresponding series circuit, which can realize the series connection between the cell group 1 and its adjacent cell group 1.

[0054] In this invention, the number of cells 15 in a single cell group 1 is M, the number of cells connected in series between cell groups 1 is N, and the number of cells connected in parallel is K. Furthermore, in this embodiment, the cell group 1 specifically comprises several cells 15 connected in series, but not necessarily as shown above. Figure 1 The arrangement of the cells can be arbitrarily chosen to form a cell group 1, while the heating film 7 and cooling baffle 6 are arranged on both sides of each cell group 15. Here, each cell group 15 and cell group 15 have different meanings. Each cell group 15 represents the physical and positional relationship between the cells 15, while cell group 1 represents the electrical connection relationship between the cells 15. Assuming there are 20 cell groups 1 in this utility model, and each cell group 1 includes 4 cells 15, then M is 4. Assuming that all cell groups 1 are connected in series, then N is 20 and K is 1. Assuming that all cell groups 1 are connected in parallel, then N is 1 and M is 20, and K, M, and N satisfy the following equation:

[0055] Equation 1: Total number of cells 1 = M × K × N;

[0056] Equation 2: Rated voltage of battery system = (Rated voltage of individual cell) × M × N;

[0057] Equation 3: Rated capacity of battery system = (Rated capacity of individual cell) × K;

[0058] Equation 4: The rated voltage level of the battery system is the number of all combinations of K and N that satisfy Equation 1;

[0059] To further illustrate the dynamic voltage level of the battery system of this utility model, several experimental examples are set up, specifically including experimental examples 1 to 6. At the same time, the number of cells in the cell group 1 is set to 20, M is 4, and cell 15 is a ternary lithium soft-pack cell with a rated voltage of 3.7V and a rated capacity of 3Ah.

[0060] In Experiment Example 1, K is set to 1 and N to 20, that is, 20 battery cells are connected in series.

[0061] In Experiment Example 2, K is set to 2 and N to 10. That is, the 20 cell groups 1 are divided into two large cell groups, each of which contains 10 cell groups 1. The 10 cell groups 1 in each large cell group are connected in series and then the two large cell groups are connected in parallel.

[0062] In Experiment 3, K is set to 4 and N to 5, that is, the 20 cell groups 1 are divided into five large cell groups, each large cell group includes 4 cell groups 1. The 4 cell groups 1 in each large cell group are connected in parallel and then the five large cell groups are connected in series.

[0063] In Experiment 4, K is set to 5 and N to 4, that is, the 20 cell groups 1 are divided into four large cell groups, each large cell group includes 5 cell groups 1. The 5 cell groups 1 in each large cell group are connected in parallel and then the four large cell groups are connected in series.

[0064] In Experiment 5, K is set to 10 and N to 2, that is, the 20 cell groups 1 are divided into ten large cell groups, each large cell group includes 2 cell groups 1. The 2 cell groups 1 in each large cell group are connected in parallel and then the ten large cell groups are connected in series.

[0065] In Experiment 6, K was set to 20 and N to 1, meaning that 20 cells were connected in parallel.

[0066] The voltage range for each experimental case is shown in Table 1:

[0067] Table 1

[0068]

[0069] As shown in Table 1 above, the rated voltage of the battery system can be dynamically adjusted by dynamically adjusting the series and parallel connection relationship between the cell group 1 through the first switch 16 and the second switch 17.

[0070] like Figure 8 As shown, in this embodiment, the cooling baffle 6 is provided with alternating flow channel walls 14, the length of the flow channel wall 14 is less than the length of the cooling baffle 6, and the thickness of the flow channel wall 14 is equal to the height of the inner cavity of the cooling baffle 6.

[0071] Specifically, by setting the flow channel wall 14, the inner cavity of the cooling baffle 6 can be divided into tortuous channels to improve the heat exchange effect.

[0072] In this embodiment, several support columns 13 are provided on both sides of the flow channel wall 14.

[0073] In this embodiment, both the flow channel wall 14 and the support column 13 are inclined, and both the flow channel wall 14 and the support column 13 are made of elastic material;

[0074] Specifically, the inner cavity of the cooling separator 6 is divided into tortuous air ducts by the flow channel wall 14, thereby increasing the air transmission path in the cooling separator 6 and achieving sufficient heat exchange. The flow channel wall 14 in the air duct is inclined to the outer wall of the cooling separator 6, and a large number of elastic support columns are provided inside the cooling separator 6. The support columns 13 are also inclined to the outer wall of the cooling separator 6. The support columns 13, the flow channel wall 14 and the cooling separator 6 are in a non-orthogonal inclined relationship. The non-orthogonal inclined relationship allows the flow channel wall 14 and the support columns 13 to be elastically compressed, thereby accommodating the expansion of the cell 15 during use and providing constant pressure to the cell 15 to maintain the structural stability of the battery system. Preferably, the cooling separator 6 can be processed by polymer additive manufacturing.

[0075] In this embodiment, the first switch 16 is a single-pole single-throw switch, and the second switch 17 is a single-pole double-throw switch;

[0076] Specifically, the single-pole double-throw switch can switch between different circuits, thereby enabling the second switch 17 to switch between series circuits and parallel circuits.

[0077] Example 2

[0078] like Figure 9 , Figure 10 As shown, the second embodiment of this utility model provides an energy storage battery system, and the structure of the energy storage battery system provided in the second embodiment is the same as that in the first embodiment, except that:

[0079] In Example 2, the battery cell 15 has a cylindrical structure. The heating film 7 on both sides of the battery cell 15 and the cooling partition 6 are attached to the shape of each battery cell 15 and have a wavy structure. The blower plate 4 is located below the battery cell 15, the tab 1 is located on the upper surface of the battery cell 15, the first switch group 5 and the second switch group 9 are located on the tab side of the battery cell 15, the blower 3 is located on the side wall of the battery cell 15, and the output air outlet 8 has a hole structure, the hollow hole 12 has a rectangular hole structure, and it is distributed in a trapezoidal shape.

[0080] Furthermore, in this second embodiment, the heating film 7 and the cooling partition 6 can be disposed. However, in this embodiment, when actually confirming the cell group 1, any number of cells 15 connected in series can be arbitrarily selected as the cell group 1. In this embodiment, eight cells 15 connected in series are used as the cell group 1. As in the previous embodiment, each group of cells 15 represents the physical and positional relationship of the cells 15, and the cell group 1 represents the electrical connection relationship of the cells 15. Therefore, M is set to 8, and as... Figure 8As shown in the figure, the energy storage battery system provided in Embodiment 2 includes 144 2170 cylindrical sodium-ion batteries for charging and discharging light vehicles. Because the voltage plateau of sodium-ion batteries varies greatly, from 1.5 to 4V, the driving experience differs significantly between empty and fully charged states, necessitating voltage adjustment. Therefore, Embodiment 2 provides the following voltage adjustment range and corresponding state descriptions, as shown in Table 2:

[0081]

[0082] As shown in the table above, when charging the energy storage battery system provided in Example 2, switching the series-parallel connection method so that N is 18 and K is 1 (i.e., 18 cell groups 1 are connected in series) achieves high-voltage, low-current fast charging. During driving (first 50% charge, individual cells 2.75 to 4V), N is 2 and K is 9, that is, the 18 cell groups 1 are divided into 2 large cell groups, each containing 9 cell groups 1. After connecting the 9 cell groups 1 in each large cell group in parallel, the 2 large cell groups are connected in series, and the system voltage is 4V. The voltage ranges from 4 to 64V. During driving (after 50% charge, the voltage per cell is 1.5 to 2.75V), with N being 3 and K being 6. This means that the 18 cells are divided into 6 large cell groups, and each large cell group contains 3 cells. The 3 cells in each large cell group are connected in parallel, and then the 6 large cell groups are connected in series. The system voltage is 36 to 66V. Through the above voltage range adjustment strategy, the voltage range can be controlled within a reasonable range according to the charging and discharging state, improving the user experience, charging efficiency, and extending battery life.

[0083] In summary, this invention achieves uniform heat dissipation of the battery cell 15 by forcing airflow within the cooling separator 6 using a blower, while simultaneously heating the battery cell 15 using a heating film 7. This enables a highly efficient and low-cost air-cooling temperature control process for the battery cell 15. Furthermore, by controlling the on / off state of the first switch 16 and the switching of the second switch 17, this invention can control the series and parallel connection of several battery cells 15, thereby enabling the battery system to have multiple voltage levels to meet charging and discharging requirements under different voltage conditions. Additionally, the cooling separator 6 has several gradient-distributed perforations 1. 2. At the perforated holes 12, the battery cell 15 is in direct contact with the cold air, resulting in significant heat exchange. At locations without perforated holes 12, the battery cell 15 is separated from the cold air by the outer wall of the cooling baffle 6, hindering heat exchange and maintaining the low temperature of the air. Near the air duct inlet 10, the air temperature is low and the heat exchange capacity is high. A small number of perforated holes 12 are provided with small apertures. Along the airflow direction, the cold air is gradually heated, and the heat exchange capacity decreases. Therefore, more perforated holes 12 are provided at the air duct outlet 11, and their apertures are enlarged to improve the cooling capacity and ensure the temperature uniformity of the battery cell 15.

[0084] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy storage battery system, comprising a plurality of battery cells, wherein a heating film and a cooling partition are alternately arranged between adjacent groups of battery cells, the cooling partition is hollow and has an air duct inlet and an air duct outlet at both ends, a hollow blower is provided on one side of each battery cell, a blower is connected to one side of the blower, and the blower is provided with an output air outlet communicating with the air duct inlet; The surface of the cooling baffle is provided with a number of perforated holes in a gradient manner. The diameter and number of the perforated holes increase along the direction from the air duct inlet to the air duct outlet.

2. The energy storage battery system according to claim 1, characterized in that, The battery cell is fixed with tabs.

3. The energy storage battery system according to claim 2, characterized in that, The air duct outlet is located on the side of the cooling baffle closer to the tab.

4. The energy storage battery system according to claim 1, characterized in that, The heating film and the cooling partition are attached to the outer wall of the battery cell.

5. The energy storage battery system according to claim 1, characterized in that, The battery cell is provided with a first switch group and a second switch group respectively. The first switch group includes a plurality of first switches corresponding to the battery cell, and the second switch group includes a plurality of second switches corresponding to the battery cell. The battery cells are provided with series circuits and parallel circuits.

6. The energy storage battery system according to claim 5, characterized in that, The first switch is disposed in the parallel circuit, and the second switch is disposed between the series circuit and the parallel circuit. The second switch is used to switch the series circuit and the parallel circuit to achieve multi-level voltage switching.

7. The energy storage battery system according to claim 1, characterized in that, The cooling baffle has alternating flow channel walls inside, the length of which is less than the length of the cooling baffle, and the height of which is equal to the height of the inner cavity of the cooling baffle.

8. The energy storage battery system according to claim 7, characterized in that, Several support columns are provided on both sides of the flow channel wall.

9. The energy storage battery system according to claim 8, characterized in that, Both the flow channel wall and the support column are inclined, and both the flow channel wall and the support column are made of elastic material.

10. The energy storage battery system according to claim 5, characterized in that, The first switch is a single-pole single-throw switch, and the second switch is a single-pole double-throw switch.

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