Energy storage battery structure

Abstract

The utility model discloses an energy storage battery structure, and relates to the technical field of energy storage batteries, the energy storage battery structure comprises a shell, a battery pack, a heating assembly and a BMS protection plate, the shell is enclosed to form a mounting cavity; the battery pack comprises a plurality of battery cells, and the battery cells are connected in series and are sequentially arranged and mounted in the mounting cavity; the heating assembly comprises a plurality of heating plates and connecting wires, the heating plates are uniformly distributed in the arrangement direction of the battery cells and are connected in series through the connecting wires, and the two opposite sides of each heating plate abut against the two adjacent battery cells; the BMS protection plate is electrically connected with the heating assembly so as to control the heating plate to heat the battery cells.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage batteries, in particular to an energy storage battery structure. Background Art

[0002] Ultra-low temperature power batteries, as a battery technology capable of operating in extremely low temperature conditions, have a promising future. With the advancement of technology, lithium batteries are being used more and more widely. Ultra-low temperature lithium batteries have become an important power source for low-temperature equipment because they can provide sufficient energy in low-temperature environments, allowing equipment or vehicles in low-temperature environments to obtain energy and operate normally. Furthermore, with the development of renewable energy, ultra-low temperature lithium batteries have also become an important option for energy storage, capable of storing renewable energy and providing electricity when needed. The expansion of these application areas has led to a continuous increase in demand for ultra-low temperature lithium batteries. However, the application of ultra-low temperature power batteries still faces some challenges. The capacity of batteries drops sharply at temperatures between -40°C and 0°C, and most lithium batteries cannot be charged normally at temperatures below 0°C, affecting their normal use. Utility Model Content

[0003] The main purpose of the utility model is to propose an energy storage battery structure, aiming to solve the problem that lithium batteries are difficult to charge under low temperature conditions.

[0004] To achieve the above objectives, the energy storage battery structure proposed in the present invention includes:

[0005] A housing, wherein the housing encloses a mounting cavity;

[0006] A battery pack, the battery pack comprising a plurality of battery cells, the battery cells being connected in series and arranged in sequence and mounted in the mounting cavity;

[0007] A heating assembly comprising a plurality of heating plates and connecting wires, wherein the heating plates are evenly distributed along the arrangement direction of the battery cells and connected in series by the connecting wires, and opposite sides of each heating plate abut against two adjacent battery cells;

[0008] A BMS protection plate is electrically connected to the heating assembly to control the heating plate to heat each of the battery cells.

[0009] In one embodiment, a heating plate is provided between every two battery cells.

[0010] In one embodiment, the energy storage battery structure further includes an external heating switch, which is disposed on the shell and partially exposed at the top of the shell, and the external heating switch is electrically connected to the BMS protection board and the heating assembly.

[0011] In one embodiment, the energy storage battery structure further includes a charge and discharge switch, and the charge and discharge switch is electrically connected to the BMS protection board.

[0012] In one embodiment, the energy storage battery structure further includes a voltage acquisition line and a temperature sensing probe. The voltage acquisition line is connected to each of the battery cells in sequence and is electrically connected to the BMS protection board to detect the voltage data of each of the battery cells and feed it back to the BMS protection board. The temperature sensing probe is electrically connected to the BMS protection board to detect the temperature of the energy storage battery structure.

[0013] In one embodiment, the energy storage battery structure further includes a display, which is disposed at the top of the shell and exposed from the shell, and is electrically connected to the heating assembly and the BMS protection board.

[0014] In one embodiment, the energy storage battery structure further includes a heating switch power tube, which is electrically connected to the BMS protection board and communicates with the heating assembly to heat the battery cell.

[0015] In one embodiment, the energy storage battery structure further includes a discharge switch power tube, which is electrically connected to the battery cell and the BMS protection board, so that the battery cell discharges to activate the heating component for heating.

[0016] In one embodiment, the energy storage battery structure further includes a communication interface, which is electrically connected to the BMS protection board and connected to the device master control to notify the device master control of the real-time status of the battery pack.

[0017] In one embodiment, the energy storage battery structure further includes a thermal insulation layer, and the thermal insulation layer is coated on the periphery of the shell.

[0018] The technical solution of the present utility model integrates a heating component to adapt to low-temperature environments and ensure the performance and safety of the energy storage battery. The design of the shell provides physical protection and structural support for the battery pack, and the installation cavity provides an orderly spatial layout for the battery pack. The battery pack consists of multiple battery cells connected in series to increase the output voltage of the battery pack to meet the needs of different applications. The problem of battery performance degradation in low-temperature environments is solved by setting a heating component to ensure the normal charging and discharging of the energy storage battery. The direct contact between the heating plate and the battery cell can effectively increase the temperature of the battery cell, thereby ensuring the normal operation of the battery under low-temperature conditions. The BMS protection board acts as the control center of the system to control the heating component to ensure the normal operation of the energy storage battery and reduce the risk of battery damage due to excessively low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an energy storage battery structure according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the internal structure of the medium energy storage battery structure.

[0022] Description of Figure Numbers:

[0023] 1000. Energy storage battery structure; 1. Housing; 2. Battery pack; 21. Battery cell; 3. Heating assembly; 31. Heating plate; 32. Connecting wires; 4. BMS protection board; 41. Voltage acquisition line; 42. Temperature sensor probe; 5. External heating switch; 6. Charge and discharge switch; 7. Display; 8. Communication interface.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] Ultra-low temperature power batteries, as a battery technology capable of operating in extremely low temperature conditions, have a promising future. With the advancement of technology, lithium batteries are being used more and more widely. Ultra-low temperature lithium batteries have become an important power source for low-temperature equipment because they can provide sufficient energy in low-temperature environments, allowing equipment or vehicles in low-temperature environments to obtain energy and operate normally. Furthermore, with the development of renewable energy, ultra-low temperature lithium batteries have also become an important option for energy storage, capable of storing renewable energy and providing electricity when needed. The expansion of these application areas has led to a continuous increase in demand for ultra-low temperature lithium batteries. However, the application of ultra-low temperature power batteries still faces some challenges. The capacity of batteries drops sharply at temperatures between -40°C and 0°C, and most lithium batteries cannot be charged normally at temperatures below 0°C, affecting their normal use.

[0029] To solve the above problems, the present invention proposes an energy storage battery structure 1000, including a shell 1, a battery pack 2, a heating component 3 and a BMS protection plate 4. The shell 1 encloses an installation cavity; the battery pack 2 includes a plurality of battery cells 21, each battery cell 21 is connected in series and arranged in sequence and installed in the installation cavity; the heating component 3 includes a plurality of heating plates 31 and connecting wires 32, each heating plate 31 is evenly distributed along the arrangement direction of the battery cells 21 and is connected in series through the connecting wires 32, and the opposite sides of each heating plate 31 are in contact with two adjacent battery cells 21; the BMS protection plate 4 is electrically connected to the heating component 3 to control the heating plate 31 to heat each battery cell 21.

[0030] The technical solution of the present utility model integrates a heating component 3 to adapt to low-temperature environments and ensure the performance and safety of the energy storage battery. The design of the shell 1 provides physical protection and structural support for the battery pack 2, and the installation cavity provides an orderly spatial layout for the battery pack 2. The battery pack 2 is composed of a plurality of battery cells 21 connected in series to increase the output voltage of the battery pack 2 to meet the needs of different applications. The problem of battery performance degradation in low-temperature environments is solved by setting a heating component 3 to ensure the normal charging and discharging of the energy storage battery. Through direct contact between the heating plate 31 and the battery cell 21, the temperature of the battery cell 21 can be effectively increased, thereby ensuring the normal operation of the battery under low-temperature conditions. The BMS protection board 4 acts as the control center of the system to control the heating component 3 to ensure the normal operation of the energy storage battery and reduce the risk of battery damage due to excessively low temperature.

[0031] In an optional embodiment, to ensure that each heating plate 31 uniformly heats each battery cell 21, please refer to Figure 2 , a heating plate 31 is provided between every two battery cells 21. This design ensures a more uniform temperature distribution between the battery cells 21, avoids the problem of local overheating or overcooling, and thus improves the temperature consistency of the entire battery pack 2. Uniform temperature distribution helps to improve the charge and discharge efficiency and cycle stability of the battery pack 2, while also reducing the performance mismatch problem of the battery cells 21 caused by temperature differences. The thermal management of the battery pack 2 is optimized, the working efficiency and service life of the battery pack 2 are improved, and a more uniform and stable working environment is provided for the battery pack 2. Optionally, in other embodiments, the heating plates 31 can also be arranged in sequence according to the arrangement of the battery cells 21, so that a heating plate 31 is provided between any two adjacent battery cells 21. The specific selection can be made according to the actual heating needs, and is not specifically limited here.

[0032] In an optional embodiment, to facilitate manual control of the heating component 3, please refer to Figure 1 and Figure 2 The energy storage battery structure 1000 also includes an external heating switch 5. The external heating switch 5 is provided in the shell 1 and partially exposed at the top of the shell 1. The external heating switch 5 is electrically connected to the BMS protection board 4 and the heating component 3. The design of the external heating switch 5 provides the user with an intuitive operation method, allowing the user to manually control the opening and closing of the heating component 3 as needed. It not only improves the user experience, but also increases the flexibility of the system. The setting of the external heating switch 5 allows the user to actively start the heating function under certain conditions, such as when the ambient temperature is low, to ensure the performance of the energy storage battery pack 2, improves the user interactivity of the system, makes the battery system more adaptable to a changing usage environment, and also provides additional protection for the safe operation of the battery system.

[0033] In an optional embodiment, to facilitate charging and discharging of the energy storage battery, the energy storage battery structure 1000 further includes a charge / discharge switch 6 electrically connected to the BMS protection board 4. The provision of the charge / discharge switch 6 allows the BMS protection board 4 to disconnect or connect the battery pack 2 from the external circuit when necessary, which is crucial for preventing battery overcharge and over-discharge. By precisely controlling the charge and discharge process, the battery can be effectively protected and its service life extended. This enhances the safety and reliability of the battery system and ensures stable operation under various operating conditions.

[0034] In an optional embodiment, to facilitate the collection of voltage and temperature in the energy storage battery, please refer to Figure 2 The energy storage battery structure 1000 also includes a voltage acquisition line 41 and a temperature sensing probe 42. The voltage acquisition line 41 is connected to each battery cell 21 in sequence and is electrically connected to the BMS protection board 4 to detect the voltage data of each battery cell 21 and feed it back to the BMS protection board 4. The temperature sensing probe 42 is electrically connected to the BMS protection board 4 to detect the temperature of the energy storage battery structure 1000. By setting the voltage acquisition line 41 to monitor the voltage of each battery cell 21 in real time, it is ensured that each battery cell 21 in the battery pack 2 is within a safe operating voltage range. The temperature sensing probe 42 can monitor the temperature of the battery in real time and provide temperature data to the BMS so that the heating strategy can be adjusted in time. This design enables the BMS to control the working status of the battery more accurately, improving the stability and safety of the battery system. The monitoring accuracy of the battery system is improved, allowing the battery management system to more effectively protect the battery and prevent battery damage caused by voltage or temperature abnormalities.

[0035] Further, in order to facilitate operators to more intuitively understand the detection data of the energy storage battery pack 2, please refer to Figure 1 and Figure 2 The energy storage battery structure 1000 also includes a display 7, which is provided at the top of the housing 1 and exposed from the housing 1. The display 7 is electrically connected to the heating assembly 3 and the BMS protection board 4. The display 7 is designed to provide the user with an intuitive interface to display the working status of the energy storage battery pack 2 in real time, including information such as temperature, voltage, and charging status, so that the user can more conveniently understand the operating status of the battery system and perform necessary operations in a timely manner. The setting of the display 7 not only improves the user experience, but also facilitates the maintenance and fault diagnosis of the battery system, enhances the monitorability of the battery system, allows the user to more intuitively understand the status of the battery, and improves the ease of use and maintainability of the system.

[0036] In an optional embodiment, in order to ensure the normal charging and discharging of the energy storage battery structure 1000 at -20°C to 0°C, the energy storage battery structure 1000 also includes a heating switch power tube, which is electrically connected to the BMS protection board 4 and connected to the heating component 3 to heat the battery cell 21. The setting of the heating switch power tube allows the BMS protection board 4 to more accurately and quickly control the start and stop of the heating component 3 to adapt to different temperature requirements. This design improves the response speed and control accuracy of the heating system, and helps to quickly increase the battery temperature in a low temperature environment. The temperature regulation ability of the battery system is improved, so that the battery can quickly restore its performance under low temperature conditions, and the energy efficiency of the system is also improved. Specifically, in an environment of -20°C to 0°C: the energy storage battery pack 2 can discharge normally, but cannot charge normally. To charge, the battery pack 2 must be connected to a charger and mains power. The external heating switch 5 must be turned on (this switch should remain on during cooler temperatures in autumn and winter, and can be turned off or on during hotter temperatures in spring and summer). The BMS detects the external voltage of the charger and turns on the heating switch power tube. The charger then supplies heating current to the heating plate 31. The heating plate 31 heats the battery cell 21 for approximately 60 minutes, raising the temperature of the battery cell 21 to above 0°C. The BMS detects that the battery cell 21 has reached the charging temperature and turns on the charging switch power tube to begin charging. As the temperature of the battery cell 21 rises, charging efficiency increases. When the BMS detects that the battery cell 21 temperature has risen to approximately 35°C, it turns off the heating switch power tube, and the charger charges with full current, accelerating charging. Due to ambient temperature, the battery cell 21 temperature gradually decreases to approximately 5°C. The BMS turns on the heating switch power tube again, diverting the charger current to the heating plate 31 for further heating until the battery cell 21 temperature reaches approximately 35°C. This cycle repeats until the battery pack 2 is fully charged, at which point the charger stops outputting current, and both heating and charging cease.

[0037] Furthermore, in order to ensure the normal operation of the energy storage battery structure 1000 at -40°C to -20°C, the energy storage battery structure 1000 also includes a discharge switch power tube, which is electrically connected to the battery cell 21 and the BMS protection board 4, so that the discharge of the battery cell 21 starts the heating component 3 for heating. By setting a discharge switch power tube in the energy storage battery structure 1000, the heating component 3 can be started under extremely low temperature conditions. This design allows the battery pack 2 to start the heating component 3 by controlling the discharge of the battery cell 21 when the temperature is below -40°C to -20°C, so as to ensure the normal operation of the battery pack 2. The reliability of the battery in extreme environments is ensured. The self-heating ability of the battery system under extreme low temperature conditions is improved, ensuring that the battery can operate normally in various environments. Specifically, when in an environment of -40°C to -20°C, the battery pack 2 cannot discharge or charge normally. When the BMS detects that the temperature of the battery cell 21 is around -19°C-20°C, it will turn on the discharge switch power tube and the heating switch power tube, and the battery pack 2 will discharge to provide heating current to the heating plate 31 for self-heating. The temperature of the battery cell 21 is maintained at around -10°C. At this time, the battery pack 2 can discharge normally to ensure the operation of the equipment. When the BMS detects that the capacity of the battery pack 2 is less than 20% of the total capacity, it will turn off the discharge switch power tube and the heating switch power tube, stop self-discharge heating, and enter a dormant state to ensure the service life of the energy storage battery structure 1000.

[0038] Furthermore, in order to facilitate early warning when the energy storage battery pack 2 is out of power, please refer to Figure 1 and Figure 2 Energy storage battery structure 1000 also includes a communication interface, which is electrically connected to BMS protection board 4 and connected to the device master control to notify the device master control of the real-time status of battery pack 2. When battery pack 2 is low on power, the communication interface notifies the device master control of the real-time status of battery pack 2 and power shortage warning information. The master control then connects to an automatic charger for charging or notifies the operator to remove battery pack 2 for indoor charging, ensuring the normal operation of energy storage battery structure 1000. This enables remote monitoring and intelligent management, enhances the communication capabilities of the battery system, enables effective data exchange between the battery system and external devices, and improves the system's integration and intelligence.

[0039] In an optional embodiment, to insulate the energy storage battery structure 1000, the energy storage battery structure 1000 further includes an insulation layer, which is coated around the periphery of the housing 1. Providing an insulation layer around the periphery of the housing 1 reduces heat loss from the battery system in low-temperature environments. The insulation layer effectively isolates the battery pack 2 from the external cold, maintaining the temperature, thereby reducing energy consumption by the heating assembly 3 and improving the energy efficiency of the battery system. This helps maintain the performance of the energy storage battery in low-temperature environments, extending the battery life and improving the efficiency and reliability of the battery system in low-temperature environments.

[0040] The following is a detailed description of the energy storage battery structure 1000 in one embodiment of this solution. Figure 1 and Figure 2 The energy storage battery structure 1000 consists of 15 battery cells 21 connected in series through a busbar to form a 48V110Ah finished product voltage capacity specification. The negative power line of the battery pack 2 is connected to the input port of the BMS protection board 4, and the BMS output port is connected to the external charge and discharge port. The positive power line of the battery pack 2 is connected to the total positive port of the battery pack 2, thereby forming a charge and discharge circuit. The voltage acquisition line 41 connects each string of battery cells 21 in sequence, and is aggregated to the cable end to connect to the voltage acquisition port of the BMS protection board 4, forming a BMS voltage data acquisition circuit for the battery pack 2 battery cells 21. The display 7 is connected to the total positive and negative ports of the battery pack 2. The total voltage of the battery pack 2 drives the display 7 to analyze the current capacity percentage of the battery pack 2, and displays the real-time voltage and temperature. The heating system consists of 9 heating plates 31 (it should be noted that the heating plate 31 used in this embodiment has a backing adhesive surface on one side and a welding surface on the other side. When assembled, the welding surfaces of the heating plates 31 at both ends face outward to facilitate the connection of the wires. Therefore, Figure 2 A heating plate 31 of a different specification is used on the right side of the rightmost cell, with the welding surface facing outward. In this embodiment, a total of nine heating plates 31, connecting wires 32, an external heating switch 5, and a BMS protection board 4 form a heating circuit. The nine heating plates 31 are connected in series by connecting wires 32. The positive end is connected to the external heating switch 5, which is then connected to the total positive port of the battery pack 2, and the negative end is connected to the heating function port of the BMS protection board 4. This forms a heating circuit for the battery pack 2, thereby heating the battery pack 2 and ensuring the normal operation of the energy storage battery structure 1000.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy storage battery structure, characterized in that: include: A housing, wherein the housing encloses a mounting cavity; A battery pack, the battery pack comprising a plurality of battery cells, the battery cells being connected in series and arranged in sequence and mounted in the mounting cavity; A heating assembly comprising a plurality of heating plates and connecting wires, wherein the heating plates are evenly distributed along the arrangement direction of the battery cells and connected in series by the connecting wires, and opposite sides of each heating plate abut against two adjacent battery cells; A BMS protection plate is electrically connected to the heating assembly to control the heating plate to heat each of the battery cells.

2. The energy storage battery structure according to claim 1, characterized in that: A heating plate is provided between every two battery cells.

3. The energy storage battery structure according to claim 2, characterized in that: The energy storage battery structure further includes an external heating switch, which is disposed on the shell and partially exposed at the top of the shell. The external heating switch is electrically connected to the BMS protection board and the heating assembly.

4. The energy storage battery structure according to claim 3, characterized in that: The energy storage battery structure further includes a charge and discharge switch, which is electrically connected to the BMS protection board.

5. The energy storage battery structure according to any one of claims 1 to 4, characterized in that: The energy storage battery structure also includes a voltage acquisition line and a temperature sensing probe. The voltage acquisition line is connected to each of the battery cells in sequence and is electrically connected to the BMS protection board to detect the voltage data of each of the battery cells and feed it back to the BMS protection board. The temperature sensing probe is electrically connected to the BMS protection board to detect the temperature of the energy storage battery structure.

6. The energy storage battery structure according to claim 5, characterized in that: The energy storage battery structure further includes a display, which is disposed at the top of the shell and exposed from the shell, and is electrically connected to the heating assembly and the BMS protection board.

7. The energy storage battery structure according to claim 6, characterized in that: The energy storage battery structure further includes a heating switch power tube, which is electrically connected to the BMS protection board and communicates with the heating assembly to heat the battery cell.

8. The energy storage battery structure according to claim 7, characterized in that: The energy storage battery structure further includes a discharge switch power tube, which is electrically connected to the battery cell and the BMS protection board to enable the battery cell to discharge and activate the heating component for heating.

9. The energy storage battery structure according to claim 8, characterized in that: The energy storage battery structure also includes a communication interface, which is electrically connected to the BMS protection board and connected to the equipment master control to notify the equipment master control of the real-time status of the battery pack.

10. The energy storage battery structure according to claim 9, characterized in that: The energy storage battery structure further includes a heat-insulating layer, which is coated on the periphery of the shell.

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