Self-heating device for lithium-ion batteries in low-temperature environments

Abstract

This invention relates to the field of lithium-ion battery technology and discloses a self-heating device for lithium-ion batteries in low-temperature environments. The device includes a protective shell and a lithium-ion battery. The protective shell has several battery chambers inside, with the lithium-ion battery located within a corresponding chamber. A heating film is provided on the outer wall of the lithium-ion battery for rapid heating under low-temperature conditions. This device integrates key components such as the heating film, temperature control components, and an air circulation zone, ensuring that the lithium-ion battery maintains optimal performance under various temperature conditions. Especially in low-temperature environments, the heating film can rapidly heat up, allowing the lithium-ion battery to quickly reach its suitable operating temperature. The heating film then closes, while the temperature control components provide subsequent heat preservation, reducing unnecessary energy consumption. This invention is characterized by its strong practicality and ability to provide a suitable temperature for the battery.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, specifically to a self-heating device for lithium-ion batteries in low-temperature environments. Background Technology

[0002] Lithium-ion batteries (LIBs) are a type of rechargeable battery. The core working principle of lithium-ion batteries is based on the reversible insertion and extraction process of lithium ions between the positive and negative electrodes to achieve energy storage and release. Specifically, during charging, lithium ions are extracted from the positive electrode material, move through the electrolyte to the negative electrode and insert into it. During discharging, they return from the negative electrode to the positive electrode in the opposite way. This "rocking chair" design makes lithium-ion batteries have higher energy density, longer cycle life and better safety than traditional batteries.

[0003] With increasing global awareness of environmental protection and technological advancements, electric vehicles are gradually becoming a new trend in the automotive industry. Against this backdrop, lithium-ion batteries have become an ideal choice for driving electric vehicles due to their superior performance.

[0004] Although lithium-ion batteries perform well at room temperature, they face a series of challenges in low-temperature environments. As the temperature drops, the viscosity of the electrolyte increases or even partially solidifies, slowing down the lithium-ion conduction speed and affecting the reaction rate of the entire battery system. More importantly, low temperatures exacerbate lithium plating on the negative electrode surface, meaning that lithium ions cannot be smoothly intercalated between graphite layers and are directly deposited as metallic lithium. This not only reduces the usable capacity but may also cause the risk of internal short circuits, seriously threatening the safety of the battery. Therefore, it is essential to design a practical self-heating device for lithium-ion batteries that provides a suitable temperature for the battery in low-temperature environments. Summary of the Invention

[0005] The purpose of this invention is to provide a self-heating device for lithium-ion batteries in low-temperature environments, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a self-heating device for lithium-ion batteries in low-temperature environments, comprising a protective shell and a lithium-ion battery. The protective shell has several battery chambers inside, with the lithium-ion battery located in a corresponding battery chamber. A heating film is provided on the outer wall of the lithium-ion battery for rapid heating under low-temperature conditions. A temperature sensor is embedded in the top of each battery chamber for detecting the temperature inside the battery chamber. A temperature control chamber is provided inside the protective shell and outside the battery chambers, containing a temperature control component for temperature regulation of the battery chambers. An air circulation zone is provided in the middle of the protective shell for natural heat dissipation of the lithium-ion battery. The air circulation zone extends through the battery chambers and communicates with the outside. The air circulation zone is arranged in a linear array along the height of the protective shell. A BMS controller is provided at the upper end of the protective shell, and the BMS controller is electrically connected to the heating film, the temperature sensor, and the temperature control component. A power socket is provided on one side of the protective shell.

[0007] According to the above technical solution, the temperature control component includes a liquid storage chamber, a heating plate, a cooling plate, a circulation pipeline, and a delivery pump. The liquid storage chamber is located at the bottom inside the protective shell and is used to store circulating liquid. The heating plate and the cooling plate are respectively disposed in the liquid storage chamber, and the heating plate and the cooling plate respectively heat and cool the circulating liquid. A circulation pipeline is provided above the liquid storage chamber. The circulation pipeline is corrugated and disposed in the temperature control chamber. Both ends of the circulation pipeline are connected to the liquid storage chamber. A delivery pump is provided on the circulation pipeline. The heating plate, the cooling plate, and the delivery pump are electrically connected to the BMS controller.

[0008] According to the above technical solution, the protective shell has an equilateral triangle cross-section, the outer corners of the protective shell are rounded, and the battery cavity is set to three and arranged in a circular array inside the protective shell.

[0009] According to the above technical solution, the protective shell includes a protective bottom shell and a protective top shell. The protective bottom shell is disposed at the lower end of the protective top shell, and the protective bottom shell and the protective top shell are fixedly connected by a quick connector.

[0010] According to the above technical solution, the quick connector includes a connecting post and a connecting groove. The connecting post is fixedly installed at the middle position of the lower end of the protective top shell, and the connecting groove is opened at the middle position of the upper end of the protective bottom shell. The connecting post has an inner cavity and a locking element is provided in the inner cavity. The connecting post is fixedly installed in the connecting groove by the locking element.

[0011] According to the above technical solution, the locking component includes a servo motor, a rotating rod, a fixed ring, an arc-shaped connecting rod, and locking posts. The servo motor is fixedly installed at the top of the inner cavity, and the rotating rod is fixedly installed at the output end of the servo motor. The end of the rotating rod is movably installed in the inner cavity. The fixed ring is fixedly installed on the rotating rod. The locking posts are arranged in a circumferential array on the outer wall of the fixed ring. The side wall of the connecting post is arranged in a circumferential array with inlet and outlet channels. The locking posts and the inlet and outlet channels are arranged in a one-to-one correspondence. The locking posts and the fixed ring are movably connected by the arc-shaped connecting rod. The inner wall of the connecting groove is arranged in a circumferential array with locking grooves corresponding to the locking posts. The servo motor and the BMS controller are electrically connected.

[0012] According to the above technical solution, an inner edge plate is installed on the upper end of the protective top shell, and a top cover is fixedly installed on the inner edge plate by bolts. The BMS controller is located inside the top cover. A handle ring is fixedly installed on the upper end of the top cover by a connecting handle. The handle ring is located in the middle position above the top cover, and the connecting handle is arranged in a circumferential array on the side wall of the handle ring.

[0013] According to the above technical solution, a sealing gasket is provided at one of the adjacent edge positions of the protective bottom shell and the protective top shell, and the sealing gasket is arranged along the peripheral wall direction of the protective bottom shell and the protective top shell.

[0014] According to the above technical solution, the end of the locking post is shaped like a frustum and a touch sensor is fixedly installed thereon. The touch sensor is electrically connected to the BMS controller.

[0015] According to the above technical solution, a card holder is fixedly installed at the lower end of the protective bottom shell, and the card holder is arranged in a circumferential array at the lower end of the protective bottom shell.

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0017] (1) Efficient and stable temperature management: This device integrates key components such as heating film, temperature control components and air circulation area to ensure that lithium-ion batteries can maintain optimal performance under various temperature conditions. Especially in low temperature environment, the heating film can heat up quickly so that the lithium-ion battery can quickly reach the appropriate working temperature. The heating film is turned off, and the temperature control components provide subsequent heat preservation effect, reducing unnecessary energy consumption and preventing damage that may be caused by frequent heating-cooling cycles. This method not only saves energy but also extends the service life of lithium-ion batteries. At the same time, when the lithium-ion temperature is too high, it can assist in cooling the lithium-ion battery, achieving precise temperature control and providing the lithium-ion battery with a suitable working temperature. The design of the air circulation area not only promotes natural heat dissipation but also achieves more effective cooling by mixing hot and cold air in high temperature environment. It is more efficient than simply relying on natural heat dissipation. At the same time, it effectively separates each battery cavity, ensuring that each lithium-ion battery can be efficiently cooled in its own dedicated battery cavity, avoiding mutual interference between different lithium-ion batteries.

[0018] (2) Stable structure: The cross-section of the protective shell is designed as an equilateral triangle. This shape can provide better compressive strength with the same amount of material, enhance the protection of internal components, reduce local stress concentration, and improve the overall structural stability. The battery cavity is arranged in a circular array inside the protective shell. This layout is not only conducive to the uniform distribution of heat, but also to the management and maintenance of each battery cell, and helps to reduce the mutual influence between different batteries.

[0019] (3) Convenient installation and maintenance: The quick connector, consisting of connecting columns and connecting grooves, makes the fixing between the protective top shell and the protective bottom shell quick and reliable, shortening the assembly time and facilitating later inspection and maintenance. The design of the locking component ensures the tightness and safety of the connection, avoids stress points caused by fasteners, and reduces the risk of cracking or deformation.

[0020] (4) Intelligent control system: The BMS controller is located on the top of the protective shell. In addition to coordinating and managing the work of the heating film, temperature sensor and temperature control components, it also has complex algorithms to optimize the heating strategy and undertakes functions such as battery status monitoring and fault diagnosis to ensure the safe and reliable operation of the entire system. More importantly, the BMS can achieve intelligent temperature control through electrical connection with the heating film, temperature sensor and temperature control components to ensure that the lithium-ion battery is always in the best working state. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a first perspective view of the present invention;

[0023] Figure 2 This is a second perspective view of the present invention;

[0024] Figure 3 This is a third perspective view of the present invention;

[0025] Figure 4 This is a first partial three-dimensional schematic diagram of the present invention;

[0026] Figure 5 This is a second partial perspective view of the present invention;

[0027] Figure 6 This is a third partial perspective view of the present invention;

[0028] Figure 7 This is a fourth partial perspective view of the present invention;

[0029] Figure 8 This is a fifth partial perspective view of the present invention;

[0030] Figure 9 This is a sixth partial perspective view of the present invention;

[0031] Figure 10 This is a three-dimensional schematic diagram of the temperature control component of the present invention;

[0032] In the diagram: 1-Protective shell, 11-Protective bottom shell, 12-Protective top shell, 121-Inner edge plate, 13-Quick connector, 131-Connecting post, 132-Connecting groove, 14-Top cover, 15-Connecting handle, 16-Handle ring, 17-Sealing gasket, 18-Card holder, 2-Lithium-ion battery, 3-Battery cavity, 31-Temperature control cavity, 4-Heating film, 5-Temperature sensor, 6-Temperature control component, 61-Liquid storage cavity, 62-Heating plate, 63-Cooling plate, 64-Circulation pipeline, 65-Transfer pump, 7-Air circulation area, 8-BMS controller, 9-Locking component, 91-Servo motor, 92-Rotating rod, 93-Fixing ring, 94-Arc-shaped connecting rod, 95-Locking post, 951-Touch sensor. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-10This invention provides a technical solution: a self-heating device for lithium-ion batteries in low-temperature environments, comprising a protective shell 1 and a lithium-ion battery 2. The protective shell 1 has a plurality of battery cavities 3 arranged in a circular array inside, with the lithium-ion battery 2 located within a corresponding battery cavity 3. A heating film 4 is provided on the outer wall of the lithium-ion battery 2 for rapid heating under low-temperature conditions. A temperature sensor 5 is embedded in the top of each battery cavity 3 for detecting the temperature within the cavity. A temperature control cavity 31 is provided inside the protective shell 1 and located outside the battery cavity 3. A temperature control component 6 is provided inside the cavity 31 for temperature control and adjustment of the battery cavity 3. An air circulation area 7 is provided in the middle of the protective shell 1 for natural heat dissipation of the lithium-ion battery 2. The air circulation area 7 is arranged through the battery cavity 3 and communicates with the outside. The air circulation area 7 is arranged in a linear array along the height direction of the protective shell 1. A BMS controller 8 is provided at the upper end of the protective shell 1. The BMS controller 8 is electrically connected to the heating film 4, the temperature sensor 5 and the temperature control component 6 respectively. A power socket is provided on one side of the protective shell 1.

[0035] This device aims to provide electric vehicles with a mobile energy storage unit capable of maintaining high efficiency in low-temperature environments. By integrating key components such as a heating film 4, a temperature control component 6, and an air circulation zone 7, it ensures that the lithium-ion battery 2 maintains optimal performance under various temperature conditions and extends battery life. The protective shell 1, as the outer shell of the entire system, provides physical protection to prevent damage to internal components from the external environment. Inside the protective shell 1, several battery chambers 3 are arranged in a circumferential array, each independently storing one lithium-ion battery 2. This layout not only facilitates uniform heat distribution but also makes it easier to manage and maintain each battery unit. The lithium-ion battery 2 is the core energy storage element of the entire device, and they are installed... Each lithium-ion battery 2 is housed within its own battery compartment 3. These batteries store electrical energy and release it to the electric vehicle when needed. To ensure the safety and reliability of the lithium-ion batteries 2, each battery 2 is equipped with necessary protection measures, such as overcharge or over-discharge protection circuits. A temperature sensor 5 is embedded at the top of each battery compartment 3 to monitor temperature changes within the compartment in real time. The temperature sensor 5 is crucial for achieving precise temperature control, as it helps the BMS controller 8 accurately determine when to start or stop the heating process, ensuring that the lithium-ion batteries 2 are always within their optimal operating temperature range. The temperature control component 6 is located in the temperature control cavity 31 within the protective shell 1 and is responsible for accurately controlling the temperature of the entire system. The temperature control component 6 features temperature monitoring and feedback: connected to temperature sensor 5, it can acquire real-time temperature information within each battery compartment 3 and adjust its operating status accordingly. It also includes a heat preservation function: once the lithium-ion battery 2 reaches its optimal operating temperature, the heating film 4 closes, while the temperature control component provides subsequent heat preservation, reducing unnecessary energy consumption and preventing damage from frequent heating-cooling cycles. This method not only saves energy but also extends the lifespan of the lithium-ion battery. Furthermore, it assists in cooling: if the lithium-ion battery 2 becomes too hot due to external environmental factors or other factors, the temperature control component 6 can activate an additional cooling mechanism to help lower the temperature. This method is more effective than simply relying on natural heat dissipation, especially… In a high-temperature environment, the air circulation zone 7 runs through each battery cavity 3, allowing external cold air to flow in and mix with the heated air before being discharged, thus achieving natural heat dissipation. This effectively separates each battery cavity 3, ensuring that each lithium-ion battery 2 can efficiently dissipate heat within its dedicated battery cavity 3, avoiding mutual interference between different lithium-ion batteries 2. The BMS controller 8 is located on the top of the protective shell 1 and is responsible for coordinating and managing the operation of the heating film 4, temperature sensor 5, and temperature control component 6, ensuring that the lithium-ion battery 2 can obtain sufficient heat at low temperatures without being damaged by overheating. In addition, the BMS also undertakes functions such as battery status monitoring and fault diagnosis, ensuring the safe and reliable operation of the entire system.

[0036] Specifically, the temperature control component 6 includes a liquid storage chamber 61, a heating plate 62, a cooling plate 63, a circulation pipeline 64, and a delivery pump 65. The liquid storage chamber 61 is located at the bottom inside the protective shell 1 and is used to store circulating liquid. The heating plate 62 and the cooling plate 63 are respectively disposed in the liquid storage chamber 61, and the heating plate 62 and the cooling plate 63 respectively heat and cool the circulating liquid. The circulation pipeline 64 is provided above the liquid storage chamber 61. The circulation pipeline 64 is corrugated and disposed in the temperature control chamber 31. Both ends of the circulation pipeline 64 are connected to the liquid storage chamber 61. The delivery pump 65 is provided on the circulation pipeline 64. The heating plate 62, the cooling plate 63, and the delivery pump 65 are respectively electrically connected to the BMS controller 8.

[0037] The liquid storage chamber 61 is used to store the circulating liquid, which is a liquid specifically designed to transfer heat. It usually has good thermal conductivity and chemical stability. The lower end of the protective shell 1 is provided with the inlet and outlet of the circulating liquid. The liquid storage chamber 61 is equipped with a heating plate 62 and a cooling plate 63, which are responsible for heating or cooling the circulating liquid, respectively. The liquid storage chamber 61 serves as the heat exchange center of the entire temperature control system and can adjust the temperature of the circulating liquid as needed. The temperature control component 6 has both heating and cooling capabilities, which greatly improves the flexibility and response speed of the system. The circulation pipeline 64 is corrugated and set in the temperature control chamber 31, and both ends are connected to the liquid storage chamber 61, which increases the heat exchange area and improves the heat exchange efficiency, so that the heat in the circulating liquid can be transferred more effectively.

[0038] Specifically, the protective shell 1 has an equilateral triangle cross-section, and the corners of the outer wall of the protective shell 1 are rounded. The number of battery cavities 3 is set to three and arranged in a circular array inside the protective shell 1.

[0039] The cross-section of the protective shell 1 is designed as an equilateral triangle. Compared with the traditional circular or rectangular cross-section, the equilateral triangle can provide better compressive strength with the same amount of material. This is because the triangular structure naturally has high stability, which can effectively disperse external forces and reduce local stress concentration, thereby enhancing the protective shell 1's ability to protect internal components.

[0040] Specifically, the protective shell 1 includes a protective bottom shell 11 and a protective top shell 12. The protective bottom shell 11 is disposed at the lower end of the protective top shell 12, and the protective bottom shell 11 and the protective top shell 12 are fixedly connected by a quick connector 13.

[0041] The protective bottom shell 11 is located below, providing support and a stable foundation for the internal components; while the protective top shell 12 is installed above, covering and protecting the entire device from the influence of the external environment. The quick connector 13 is a key component that connects the protective bottom shell 11 and the protective top shell 12. It makes the fixing between the two quick and reliable, shortens the assembly time, and also facilitates later inspection and maintenance.

[0042] Specifically, the quick connector 13 includes a connecting post 131 and a connecting groove 132. The connecting post 131 is fixedly installed at the middle position of the lower end of the protective top shell 12, and the connecting groove 132 is opened at the middle position of the upper end of the protective bottom shell 11. The connecting post 131 has an inner cavity and a locking member 9 is provided in the inner cavity. The connecting post 131 is fixedly installed in the connecting groove 132 by the locking member 9.

[0043] Both the connecting post 131 and the connecting groove 132 are located in the center of the protective top shell 12 and the protective bottom shell 11. Traditionally, fasteners are set at the edge of the protective shell 1, which can provide a certain fixing effect, but can also easily cause local stress concentration, especially when subjected to external impact. In contrast, the centrally located connection method can distribute the pressure from above more evenly, avoid stress points caused by fasteners, and thus reduce the risk of cracking or deformation. No longer needing to set additional fasteners at the edge means reducing assembly steps and also reducing the possibility of seal failure due to improper installation. In addition, the absence of exposed fasteners also helps to maintain a neat and beautiful appearance.

[0044] Specifically, the locking component 9 includes a servo motor 91, a rotating rod 92, a fixing ring 93, an arc-shaped connecting rod 94, and locking posts 95. The servo motor 91 is fixedly installed at the top of the inner cavity, and the rotating rod 92 is fixedly installed at the output end of the servo motor 91. The end of the rotating rod 92 is movably installed in the inner cavity. The fixing ring 93 is fixedly installed on the rotating rod 92. The locking posts 95 are arranged in a circumferential array on the outer wall of the fixing ring 93. The side wall of the connecting post 131 is arranged in a circumferential array with inlet and outlet channels. The locking posts 95 and the inlet and outlet channels are arranged one-to-one. The locking posts 95 and the fixing ring 93 are movably connected by the arc-shaped connecting rod 94. The inner wall of the connecting groove 132 is arranged in a circumferential array with locking grooves corresponding to the locking posts 95. The servo motor 91 is electrically connected to the BMS controller 8.

[0045] Locking pins 95 are arranged in a circular array on the outer wall of the fixing ring 93, and correspond one-to-one with the inlet and outlet channels on the side wall of the connecting pin 131. When the servo motor 91 is started and the rotating rod 92 is rotated, the locking pins 95 will pass through their respective inlet and outlet channels in sequence and finally be embedded in the locking slots pre-set on the inner wall of the connecting groove 132. This design not only achieves fast locking, but also ensures the tightness and safety of the connection. The servo motor 91 serves as the power source and is fixedly installed on the top of the inner cavity of the connecting pin 131. It drives the rotating rod 92 to rotate through high-precision angle control. The feature of the servo motor 91 is that it can provide very accurate position feedback, ensuring that the expected effect is achieved in every operation.

[0046] Specifically, an inner edge plate 121 is installed on the upper end of the protective top shell 12, and a top cover 14 is fixedly installed on the inner edge plate 121 by bolts. The BMS controller 8 is located inside the top cover 14. A handle ring 16 is fixedly installed on the upper end of the top cover 14 by a connecting handle 15. The handle ring 16 is located at the middle position above the top cover 14, and the connecting handle 15 is arranged in a circumferential array on the side wall of the handle ring 16.

[0047] The inner edge plate 121 is installed at the upper edge of the protective top shell 12, which serves to strengthen the structural strength and provide an additional mounting surface. It provides a stable support platform for the subsequently installed top cover 14. It is fixed to the inner edge plate 121 by bolts, forming a protective barrier for the BMS controller 8 and protecting it from the influence of the external environment. The handle 16 is located in the middle of the top cover 14. It is a key component that users directly contact and use to lift or move the entire device. The design of the handle 16 needs to take into account both comfort and durability. It is usually made of wear-resistant, anti-aging and good-feeling materials, such as nylon or engineering plastics.

[0048] Specifically, a sealing gasket 17 is provided at one of the adjacent edges of the protective bottom shell 11 and the protective top shell 12, and the sealing gasket 17 is arranged along the peripheral wall direction of the protective bottom shell 11 and the protective top shell 12;

[0049] The main function of the sealing gasket 17 is to prevent external particles and liquids from entering the interior of the protective housing 1. In addition to physical isolation, the sealing gasket 17 can also play a certain role in shock absorption, absorbing the impact from the outside and reducing the impact on internal components.

[0050] Specifically, the locking post 95 is frustum-shaped at its end and a touch sensor 951 is fixedly installed thereon. The touch sensor 951 is electrically connected to the BMS controller 8.

[0051] The end of the locking pin 95 adopts a frustum-shaped design. This shape not only helps to reduce frictional resistance when entering or exiting the locking groove, but also provides a more stable contact surface to ensure that the locking action is completed smoothly. The frustum-shaped design allows the locking pin 95 to transition to the locking position more smoothly during rotation, reducing the risk of jamming. A touch sensor 951 is installed at the end of the locking pin 95 to monitor changes in the locking status in real time. When the locking pin 95 enters or leaves the locking groove, the touch sensor 951 will sense this action and send a signal to the BMS controller 8. This provides the system with instant status feedback and ensures that each locking operation can be accurately recorded.

[0052] Specifically, a card holder 18 is fixedly installed at the lower end of the protective bottom shell 11, and the card holder 18 is arranged in a circumferential array at the lower end of the protective bottom shell 11;

[0053] The main function of the card holder 18 is to provide additional support points for the protective bottom shell 11, ensuring that it can be placed stably in the designated position. By evenly distributing the card holder 18 on the lower edge of the protective bottom shell 11, the weight load can be effectively distributed, avoiding deformation or damage due to excessive local pressure.

[0054] Working Principle: This device aims to provide electric vehicles with a mobile energy storage unit capable of maintaining high efficiency in low-temperature environments. By integrating key components such as the heating film 4, temperature control component 6, and air circulation zone 7, it ensures that the lithium-ion battery 2 maintains optimal performance under various temperature conditions and extends battery life. The protective shell 1, as the outer shell of the entire system, provides physical protection to prevent damage to internal components from the external environment. Inside the protective shell 1, several battery chambers 3 are arranged in a circumferential array, each independently storing one lithium-ion battery 2. This layout not only facilitates uniform heat distribution but also makes it easier to manage and maintain each battery unit. The lithium-ion battery 2 is the core energy storage element of the entire device. The lithium-ion batteries 2 are securely housed within their respective battery chambers 3. These batteries are responsible for storing electrical energy and releasing it to the electric vehicle when needed. To ensure the safety and reliability of the lithium-ion batteries 2, each battery 2 is equipped with necessary protection measures, such as overcharge or over-discharge protection circuits. Temperature sensors 5 are embedded at the top of each battery chamber 3 to monitor temperature changes within the chamber in real time. Temperature sensors 5 are crucial for precise temperature control, helping the BMS controller 8 accurately determine when to start or stop the heating process, ensuring that the lithium-ion batteries 2 are always within their optimal operating temperature range. The temperature control assembly 6, located in the temperature control chamber 31 within the protective shell 1, is responsible for controlling the temperature of the entire system. Precise control with temperature monitoring and feedback: Connected to temperature sensor 5, temperature control component 6 can acquire real-time temperature information within each battery cavity 3 and adjust its operating status accordingly; Heat preservation function: Once the lithium-ion battery 2 reaches its optimal operating temperature, the heating film 4 closes, while the temperature control component provides subsequent heat preservation, reducing unnecessary energy consumption and preventing damage that may be caused by frequent heating-cooling cycles. This method not only saves energy but also extends the lifespan of the lithium-ion battery; Auxiliary cooling: If the temperature of the lithium-ion battery 2 becomes too high due to external environment or other factors, temperature control component 6 can activate an additional cooling mechanism to help cool it down. This method is more effective than simply relying on natural heat dissipation, especially... In high-temperature environments, the air circulation zone 7 runs through each battery cavity 3, allowing external cold air to flow in and mix with the heated air before being discharged, thus achieving natural heat dissipation. This effectively separates each battery cavity 3, ensuring that each lithium-ion battery 2 can efficiently dissipate heat within its dedicated battery cavity 3, avoiding mutual interference between different lithium-ion batteries 2. The BMS controller 8 is located on top of the protective shell 1 and is responsible for coordinating and managing the operation of the heating film 4, temperature sensor 5, and temperature control component 6, ensuring that the lithium-ion battery 2 can obtain sufficient heat at low temperatures without being damaged by overheating. In addition, the BMS also undertakes functions such as battery status monitoring and fault diagnosis, ensuring the safe and reliable operation of the entire system.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-heating device for lithium-ion batteries in low-temperature environments, comprising a protective shell (1) and a lithium-ion battery (2), characterized in that: The protective shell (1) has several battery chambers (3) inside, and the lithium-ion batteries (2) are located in the corresponding battery chambers (3). Each battery chamber (3) independently stores one lithium-ion battery (2). The protective shell (1) has an equilateral triangle cross-section. The corners of the outer wall of the protective shell (1) are rounded. The number of battery chambers (3) is set to three and arranged in a circular array inside the protective shell (1). A heating film (4) is provided on the outer wall of the lithium-ion battery (2) for rapid heating of the lithium-ion battery (2) under low temperature conditions. A temperature sensor (5) is embedded in the top of the battery chamber (3) for detecting the temperature inside the battery chamber (3). A temperature control chamber (31) is provided inside the protective shell (1) and outside the battery chamber (3). A temperature control component (6) is provided in the temperature control chamber (31) for controlling the temperature of the battery chamber (3). 3) Temperature control adjustment is performed. An air circulation area (7) is provided in the middle of the protective shell (1) for natural heat dissipation of the lithium-ion battery (2). The air circulation area (7) is arranged through the battery cavity (3) and communicates with the outside. The air circulation area (7) is arranged in a linear array along the height direction of the protective shell (1). A BMS controller (8) is provided at the upper end of the protective shell (1). The BMS controller (8) is electrically connected to the heating film (4), the temperature sensor (5) and the temperature control component (6) respectively. A power socket is provided on one side of the protective shell (1). The protective shell (1) includes a protective bottom shell (11) and a protective top shell (12). The protective bottom shell (11) is located at the lower end of the protective top shell (12). The protective bottom shell (11) and the protective top shell (12) are fixedly connected by a quick connector (13).

2. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 1, characterized in that: The temperature control component (6) includes a liquid storage chamber (61), a heating plate (62), a cooling plate (63), a circulation pipeline (64), and a delivery pump (65). The liquid storage chamber (61) is located at the bottom inside the protective shell (1) and is used to store circulating liquid. The heating plate (62) and the cooling plate (63) are respectively disposed in the liquid storage chamber (61). The heating plate (62) and the cooling plate (63) heat and cool the circulating liquid respectively. A circulation pipeline (64) is provided above the liquid storage chamber (61). The circulation pipeline (64) is corrugated and disposed in the temperature control chamber (31). Both ends of the circulation pipeline (64) are connected to the liquid storage chamber (61). A delivery pump (65) is provided on the circulation pipeline (64). The heating plate (62), the cooling plate (63), and the delivery pump (65) are electrically connected to the BMS controller (8).

3. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 1, characterized in that: The quick connector (13) includes a connecting post (131) and a connecting groove (132). The connecting post (131) is fixedly installed at the middle position of the lower end of the protective top shell (12). The connecting groove (132) is opened at the middle position of the upper end of the protective bottom shell (11). The connecting post (131) has an inner cavity and a locking element (9) is provided in the inner cavity. The connecting post (131) is fixedly installed in the connecting groove (132) by the locking element (9).

4. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 3, characterized in that: The locking component (9) includes a servo motor (91), a rotating rod (92), a fixed ring (93), an arc-shaped connecting rod (94), and a locking post (95). The servo motor (91) is fixedly installed at the top of the inner cavity, and the rotating rod (92) is fixedly installed at the output end of the servo motor (91). The end of the rotating rod (92) is movably installed in the inner cavity. The fixed ring (93) is fixedly installed on the rotating rod (92). The locking posts (95) are arranged in a circular array on the outer wall of the fixed ring (93). The side wall of the connecting post (131) is arranged in a circular array with inlet and outlet channels. The locking posts (95) and the inlet and outlet channels are arranged one-to-one. The locking posts (95) and the fixed ring (93) are movably connected by the arc-shaped connecting rod (94). The inner wall of the connecting groove (132) is arranged in a circular array with locking grooves corresponding to the locking posts (95). The servo motor (91) and the BMS controller (8) are electrically connected.

5. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 1, characterized in that: The protective top shell (12) is equipped with an inner edge plate (121) at the upper end. A top cover (14) is fixedly installed on the inner edge plate (121) by bolts. The BMS controller (8) is located inside the top cover (14). A handle ring (16) is fixedly installed on the upper end of the top cover (14) by a connecting handle (15). The handle ring (16) is located in the middle position above the top cover (14). The connecting handle (15) is arranged in a circumferential array on the side wall of the handle ring (16).

6. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 1, characterized in that: A sealing gasket (17) is provided at one of the adjacent edges of the protective bottom shell (11) and the protective top shell (12), and the sealing gasket (17) is arranged along the periphery of the protective bottom shell (11) and the protective top shell (12).

7. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 4, characterized in that: The locking post (95) is frustum-shaped at its end and a touch sensor (951) is fixedly installed thereon. The touch sensor (951) and the BMS controller (8) are electrically connected.

8. The self-heating device for lithium-ion batteries in low-temperature environments according to claim 1, characterized in that: A card holder (18) is fixedly installed at the lower end of the protective bottom shell (11), and the card holder (18) is arranged in a circular array at the lower end of the protective bottom shell (11).

Images