Box body structure and battery pack

Abstract

The utility model discloses a box body structure and a battery pack, the box body structure comprises a shell, a support, a heating film and a connecting pipe, the shell is provided with a liquid injection chamber, a liquid injection port and a liquid outlet; the bracket is arranged in the liquid injection chamber, the bracket is provided with a mounting cavity and a liquid guide cavity, the mounting cavity is used for placing battery cells arranged at intervals, two opposite ends of the bracket are provided with a first liquid guide port and a second liquid guide port, the first liquid guide port is communicated with the liquid guide cavity, the liquid guide cavity is communicated with the mounting cavity, and the second liquid guide port is respectively communicated with the mounting cavity and the liquid injection chamber; the heating film is arranged on one side of the bracket; and the connecting pipe is communicated with the liquid injection port and the first liquid guide port, so that the technical problems of improving the heating efficiency of the battery and reducing the influence of non-uniform temperature distribution are solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a box structure and a battery pack. Background Technology

[0002] Lithium-ion batteries are highly sensitive to temperature changes, especially at low temperatures, where their internal resistance increases significantly, leading to a decrease in capacity and affecting their overall performance and lifespan. To address this challenge, current technologies generally employ heating methods based on air or liquid media, as well as heating via electric heating elements.

[0003] Heating methods based on electric heating elements offer advantages such as precise control over the heated area. However, a drawback is the relatively slow heating speed of the electric heating element, which can easily lead to uneven temperature distribution within the battery. Localized overheating or excessive temperature differences can adversely affect battery performance and even shorten battery life. Liquid-based heating methods achieve overall heating by immersing the battery in a liquid. This method effectively alleviates the problem of uneven temperature distribution, thereby improving battery performance. However, liquid heating requires additional system components, such as a liquid circulation system. This not only increases the overall system power consumption but also occupies extra space to accommodate the heating device and the liquid.

[0004] Therefore, improving battery heating efficiency and reducing the impact of uneven temperature distribution remain important challenges for current battery technology. Utility Model Content

[0005] One objective of this invention is to provide a housing structure and battery pack that addresses the technical problem of improving battery heating efficiency and reducing the impact of uneven temperature distribution.

[0006] To achieve the above objectives, the present invention provides the following solution: a box structure comprising a shell having an injection chamber, an injection port, and an outlet; a bracket disposed within the injection chamber, the bracket having an mounting cavity and a guiding cavity, the mounting cavity for placing spaced battery cells, a first guiding port and a second guiding port being provided at opposite ends of the bracket, the first guiding port communicating with the guiding cavity, the guiding cavity communicating with the mounting cavity, and the second guiding port communicating with both the mounting cavity and the injection chamber; a heating film disposed on one side of the bracket; and a connecting pipe communicating with the injection port and the first guiding port.

[0007] Optionally, the number of first liquid guide ports is not less than two and they are spaced apart along the thickness direction of the support; the number of second liquid guide ports is not less than two and they are spaced apart along the thickness direction of the support.

[0008] Optionally, the number of first liquid guide ports and second liquid guide ports are equal, and the first liquid guide ports and the corresponding second liquid guide ports are located on the same axis.

[0009] Optionally, the bracket includes a partition plate, a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The partition plate is located in the mounting cavity and is connected to the base plate and the side plates parallel to each other. One end of the partition plate is located between adjacent first liquid guide ports, and the other end of the partition plate is located between adjacent second liquid guide ports.

[0010] Optionally, the bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are set on the opposite side plates. The base plate or the side plates are provided with mounting grooves for snapping the battery cells.

[0011] Optionally, the bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. A first liquid guide port and a second liquid guide port are disposed on opposite side plates. A liquid guide cavity is opened in the side plate, and the side plate is provided with a connection hole. The connection hole connects the connecting pipe and the liquid guide cavity, and the first liquid guide port connects the liquid guide cavity and the mounting cavity.

[0012] Optionally, the inner wall of the bracket is provided with multiple protrusions.

[0013] Optionally, in the direction from the first liquid inlet to the second liquid inlet, the number of multiple protrusions per unit area of ​​the support gradually decreases.

[0014] Optionally, the bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates, and the heating film is disposed on the side of the base plate away from the mounting cavity.

[0015] Optionally, the bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The bracket is provided with a sliding groove, and the cover plate is slidably connected to the sliding groove.

[0016] To achieve the above objectives, the present invention provides a solution: a battery pack, which includes battery cells and the aforementioned housing structure, wherein the battery cells are disposed in the mounting cavity of the housing structure.

[0017] The beneficial effects of this utility model are as follows:

[0018] Compared to existing technologies, this application combines a dual heating method using a liquid medium and a heating film. By precisely controlling the flow path of the liquid medium, it flows across the surface of the battery cell, enabling precise heat exchange. This not only reduces unnecessary heat loss but also effectively lowers the overall power consumption of the system. The uniform flow of the liquid medium eliminates temperature differences between different areas of the battery cell, avoiding performance problems caused by uneven temperature. Simultaneously, the heating film further improves the heating efficiency of the battery cell and is suitable for scenarios requiring precise control of the heating components, making the heating process more flexible and efficient. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a box structure provided in an embodiment of the present utility model;

[0021] Figure 2 This is a top sectional view of a box structure provided in an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the box provided in this embodiment of the utility model;

[0023] Figure 4 This is a side view of the internal structure of the box provided in this embodiment of the utility model;

[0024] Figure 5 This is provided by the embodiment of the present utility model. Figure 3 A cross-sectional view along the AA direction;

[0025] Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of region A in the middle;

[0026] Figure 7 This is provided by the embodiment of the present utility model. Figure 3 Cross-sectional view along the BB direction;

[0027] Figure 8 This is provided by the embodiment of the present utility model. Figure 3 A cross-sectional view along the CC direction.

[0028] Explanation of icon numbers:

[0029] 10. Shell; 11. Injection chamber; 12. Injection port; 13. Outlet port; 20. Bracket; 21. Mounting cavity; 22. Base plate; 221. Mounting groove; 23. Cover plate; 24. Side plate; 241. First liquid guide port; 242. Second liquid guide port; 243. Liquid guide cavity; 244. Connecting hole; 25. Divider plate; 26. Protruding structure; 27. Slide groove; 30. Heating film; 40. Connecting pipe; 50. Battery cell. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1 to 4 , Figure 1 This is a schematic diagram of a box structure provided by an embodiment of the present utility model. Figure 2 This is a top sectional view of a box structure provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the internal structure of the box provided in an embodiment of this utility model. Figure 4 This is a side view of the internal structure of the box provided in this embodiment of the utility model.

[0032] This utility model provides a housing structure to improve the heating efficiency of the battery cell 50, reduce energy loss, and decrease overall power consumption. The housing structure includes a shell 10, a support 20, a heating film 30, and a connecting pipe 40. The shell 10 is provided with a liquid injection chamber 11, a liquid injection port 12, and a liquid outlet 13, capable of accommodating the liquid medium and providing an inlet and outlet for its flow. The support 20 has an internal mounting cavity 21 and a liquid guiding cavity 243. The mounting cavity 21 is used to place multiple battery cells 50 spaced apart, enabling the battery cells 50 to be uniformly heated within the liquid medium. The liquid guiding cavity 243 homogenizes and buffers the flow of liquid after it flows in, appropriately reducing the liquid flow velocity and minimizing turbulence. The support 20 has a first liquid guide port 241 and a second liquid guide port 242 at its two ends. The first liquid guide port 241 is connected to the liquid guide cavity 243, which is connected to the mounting cavity 21. The second liquid guide port 242 connects the mounting cavity 21 to the injection chamber 11, ensuring that the liquid medium flows through the liquid guide cavity 243 and then directly contacts the battery cell 50 for heat exchange. The heating film 30 is located on one side of the support 20 to provide auxiliary heating for the battery cell 50, further improving heating efficiency through electric heating. The connecting pipe 40 connects the injection port 12 to the first liquid guide port 241, allowing the liquid medium to flow smoothly into the mounting cavity 21 and participate in heat exchange.

[0033] In this embodiment, the housing structure combines a liquid medium and a heating film 30 for dual heating methods to achieve efficient heating of the battery cell 50. On one hand, by precisely controlling the flow path of the liquid medium, it flows over the surface of the battery cell 50, enabling precise heat exchange. This not only reduces unnecessary heat loss but also effectively lowers the overall power consumption of the system. On the other hand, the uniform flow of the liquid medium eliminates temperature differences between different areas of the battery cell 50, avoiding performance problems caused by uneven temperature. Simultaneously, the heating film 30 further improves the heating efficiency of the battery cell 50 and is suitable for scenarios requiring precise control of the heating components, making the heating process more flexible and efficient.

[0034] Specifically, the liquid medium enters the connecting pipe 40 through the injection port 12, and then enters the liquid guiding cavity 243 of the support 20 through the first liquid guiding port 241. In the liquid guiding cavity 243, the flow rate of the liquid medium slows down and becomes more uniform, before flowing into the mounting cavity 21. In the mounting cavity 21, the liquid medium directly exchanges heat with the battery cell 50, ensuring uniform heating of the battery cell 50. Afterward, the liquid medium flows out of the mounting cavity 21 through the second liquid guiding port 242, enters the injection chamber 11, and finally flows out through the outlet port 13, completing one heat exchange cycle. Unlike traditional heating methods, this application employs a specific flow channel design, avoiding the method of immersing the entire battery cell 50 in liquid before heating. Through precise heat exchange in localized flow channels, heat loss and system power consumption are significantly reduced, and large-volume equipment is not required to heat the entire structure, thus greatly saving space.

[0035] Furthermore, to ensure smooth flow of the liquid medium in and out of the mounting cavity 21, the bracket 20 is designed with multiple liquid guide ports to optimize the liquid flow path. Specifically, there are no fewer than two first liquid guide ports 241, which are spaced apart along the thickness direction of the bracket 20. Figure 3 The direction A in the middle represents the thickness direction of the support. This effectively reduces the flow resistance of the liquid when it flows into the mounting cavity 21, allowing the liquid medium to be more evenly distributed on the surface of the cell 50, thereby achieving uniform heat exchange. At the same time, there are no fewer than two second liquid guide ports 242, which are spaced apart along the thickness direction of the support 20. This is designed to ensure that the liquid medium can be smoothly discharged from the mounting cavity 21 after completing the heat exchange with the cell 50, avoiding local heat accumulation caused by liquid buildup.

[0036] In this embodiment, the spaced distribution of multiple first liquid guide ports 241 and second liquid guide ports 242 not only enhances the liquid flow effect but also further improves the uniformity of the temperature field around the battery cell 50. The arrangement of multiple liquid guide ports allows the liquid medium to flow rapidly at the inlet and outlet of the mounting cavity 21, reducing the energy loss that may occur due to poor flow at the inlet and outlet of the mounting cavity 21.

[0037] Furthermore, the multiple liquid guide ports can adapt to different arrangements of the battery cells 50. The position and number of the liquid guide ports can be flexibly adjusted to meet the heating requirements of different scenarios. For example, when it is necessary to enhance the heating effect on one side of the battery cell 50, the number of first liquid guide ports 241 can be increased in that area to ensure the flow rate of the liquid medium in that area, thereby achieving directional heating. In areas where enhanced heating is not required, the number of liquid guide ports can be reduced or their distribution can be adjusted to optimize the flow path of the liquid medium, improve heating efficiency, and reduce energy waste.

[0038] Furthermore, to optimize the flow path of the liquid medium and improve heat exchange efficiency, the number of first liquid guide ports 241 and second liquid guide ports 242 are set to be equal, and each first liquid guide port 241 and its corresponding second liquid guide port 242 are distributed on the same axis. This arrangement helps the liquid medium maintain the stability of its flow direction when flowing over the surface of the cell 50, ensuring that the path of the liquid medium from inflow to outflow is simple and clear, thereby reducing turbulence and local stagnation during the flow process.

[0039] In this embodiment, by aligning the first liquid guide port 241 with the corresponding second liquid guide port 242 along their axes, the liquid medium can achieve more efficient linear flow, avoiding the temperature unevenness caused by slow liquid flow at the inlet and outlet in traditional flow channel designs. Furthermore, the coaxial distribution of the liquid guide ports reduces liquid turning within the support 20, thereby reducing fluid resistance, energy loss, and making the entire heat exchange process more efficient.

[0040] Please see Figure 5 , Figure 5 This is provided by the embodiment of the present utility model. Figure 3 A cross-sectional view along the AA direction. In some embodiments, the support 20 includes a partition plate 25, a base plate 22, a cover plate 23, and multiple side plates 24, which work together to form a stable mounting cavity 21 and optimize the flow path of the liquid medium. Specifically, the base plate 22 and the cover plate 23 are arranged opposite to each other, forming the upper and lower interfaces of the support 20, and the multiple side plates 24 are perpendicularly connected to the base plate 22 and the cover plate 23, providing a robust side support structure for the support 20. The first liquid guide port 241 and the second liquid guide port 242 are respectively disposed on the opposite side plates 24, ensuring that the liquid can circulate smoothly inside the support 20. The partition plate 25 is parallel to the base plate 22 and connected to the side plates 24, with one end located between adjacent first liquid guide ports 241 and the other end located between adjacent second liquid guide ports 242.

[0041] In this embodiment, the partition plate 25 divides the internal flow channels of the mounting cavity 21 into multiple independent flow channels, effectively improving the flow of the liquid medium. Through the rational distribution of the partition plate 25, the liquid medium is guided to different flow channel areas when flowing through the battery cell 50, making its flow more uniform in the vertical direction of the entire support 20. This avoids the phenomenon of liquid medium accumulating at the bottom due to gravity, allowing each area of ​​the battery cell 50 to uniformly exchange heat with the liquid medium, resulting in a more consistent temperature across the battery cell 50 in the direction perpendicular to the base plate 22, thus improving heating uniformity. Furthermore, the partition plate 25 also increases the structural stability of the support 20, preventing deformation or vibration problems that occur during liquid flow.

[0042] Please see Figure 6 , Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A partial enlarged view of region A. In some embodiments, the support 20 includes a base plate 22, a cover plate 23, and multiple side plates 24. The base plate 22 and the cover plate 23 are arranged opposite each other and located at the upper and lower ends of the support 20, respectively. The multiple side plates 24 are vertically connected between the base plate 22 and the cover plate 23, forming the side structure of the support 20. The first liquid guide port 241 and the second liquid guide port 242 are respectively provided on the opposite side plates 24 to ensure that the liquid medium can form a flow path inside the support 20, facilitating effective heat exchange when the fluid medium flows through the battery cell 50. In addition, to facilitate the installation and fixation of the battery cell 50, a mounting groove 221 is provided on the base plate 22 or the side plate 24 of the support 20 for engaging the battery cell 50, thereby ensuring the stable positioning of the battery cell 50 in the support 20.

[0043] In this embodiment, by providing mounting grooves 221 on the base plate 22 or side plate 24, not only can the position of the battery cell 50 be stabilized, but it can also prevent the battery cell 50 from shifting or vibrating during the flow of the liquid medium. The mounting grooves 221 can closely fit the shape of the battery cell 50, providing reliable mechanical support, thereby ensuring that the battery cell 50 remains stable during heating and cooling, avoiding shaking or displacement caused by fluid impact. The presence of the mounting grooves 221 improves the safety of the battery cell 50, making the position of the battery cell 50 more fixed throughout the heating process, which helps to achieve uniform heat conduction.

[0044] Please see Figure 7 , Figure 7 This is provided by the embodiment of the present utility model. Figure 3A cross-sectional view along the BB direction. In some embodiments, the support 20 includes a base plate 22, a cover plate 23, and multiple side plates 24, forming a stable frame suitable for liquid flow and battery cell 50 installation. A first liquid guide port 241 and a second liquid guide port 242 are respectively disposed on opposite side plates 24 for guiding liquid medium into and out of the mounting cavity 21. Furthermore, a liquid guide cavity 243 is formed within the side plate 24, and the side plate 24 has a connecting hole 244 for connecting the liquid guide cavity 243 to an external connecting pipe 40, ensuring that liquid medium can flow from the connecting pipe 40 into the liquid guide cavity 243 within the support 20. The first liquid guide port 241 connects the liquid guide cavity 243 to the mounting cavity 21, allowing liquid medium to flow from the liquid guide cavity 243 into the mounting cavity 21, ensuring sufficient contact with the surface of the battery cell 50 for heat exchange.

[0045] In this embodiment, the liquid medium first enters the liquid guiding cavity 243 of the side plate 24 of the support 20 through the connecting pipe 40. The liquid guiding cavity 243 plays a homogenizing and buffering role after the liquid flows in, so as to appropriately reduce the flow velocity of the liquid and reduce turbulence in the flow. This buffering process not only helps to stabilize the liquid flow, but also makes the temperature and pressure of the liquid medium more uniform before entering the mounting cavity 21, thereby ensuring that the liquid can achieve a consistent heat exchange effect when flowing over the surface of the cell 50.

[0046] Subsequently, the homogenized liquid medium enters the mounting cavity 21 through the first liquid guide port 241, directly contacting the surface of the battery cell 50 in the mounting cavity 21 for heat exchange. Because the liquid, with its uniform flow rate and temperature, can more fully cover the surface of the battery cell 50, the heat exchange efficiency is improved, ensuring that the battery cell 50 is uniformly heated or cooled in all areas. At the same time, it avoids temperature differences caused by uneven liquid flow on the surface of the battery cell 50, improving temperature consistency during heating or cooling and extending the service life of the battery cell 50. After completing the heat exchange, the liquid medium flows from the mounting cavity 21 to the second liquid guide port 242 and exits the mounting cavity 21, forming a continuous flow path.

[0047] Further, please refer to Figure 8 , Figure 8 This is provided by the embodiment of the present utility model. Figure 3 A cross-sectional view along the CC direction. Multiple protrusions 26 are provided on the inner wall of the bracket 20, distributed within the mounting cavity 21. These protrusions not only stabilize the liquid flow but also effectively extend the contact time between the liquid medium and the battery cell 50 by controlling the flow path of the liquid medium.

[0048] In this embodiment, after the liquid medium enters the mounting cavity 21, its flow velocity is appropriately slowed down due to the raised structure 26 on the inner wall. The time the liquid remains on the surface of the battery cell 50 is extended, allowing for more thorough heat transfer and significantly improving heat exchange efficiency. Compared to a smooth flow channel design, the raised structure increases the contact area and time between the liquid and the battery cell 50 without affecting the overall flow, effectively enhancing the uniform heating or cooling effect of the liquid medium on the battery cell 50.

[0049] Furthermore, the raised structure 26 also helps reduce energy loss caused by excessively fast liquid flow. In traditional flow channel designs, if the liquid flow rate is too high, it can easily lead to insufficient heat exchange, resulting in uneven temperature distribution of the battery cell 50 and increased system energy consumption. However, the raised structure 26 in this embodiment appropriately slows down the liquid flow rate, making the heat exchange process more efficient and reducing energy waste.

[0050] Furthermore, to effectively address the natural attenuation of liquid flow velocity during flow, this embodiment features a specially designed distribution of the protruding structures 26. Within the mounting cavity 21 of the support 20, the density of the protruding structures 26 gradually decreases per unit area along the direction from the first liquid inlet 241 to the second liquid inlet 242. This distribution better matches the actual velocity changes of the liquid flow, enabling gradual optimization of fluid control to maintain an appropriate flow velocity of the liquid medium in the flow path and improve heat exchange efficiency.

[0051] In this embodiment, through this distribution pattern from high density to low density, the protrusions 26 can significantly decelerate the liquid medium as it enters the mounting cavity 21, allowing for more thorough heat exchange in the area near the first liquid inlet 241. As the liquid gradually moves along the flow path towards the second liquid inlet 242, its flow velocity naturally decreases. To avoid fluid stagnation and localized temperature differences caused by excessively slowing the flow velocity, the number of protrusions is appropriately reduced near the second liquid inlet 242, allowing the liquid to flow out of the mounting cavity 21 more smoothly and achieving a reasonable heat exchange process.

[0052] In some embodiments, the support 20 is designed to include a base plate 22, a cover plate 23, and multiple side plates 24. The base plate 22 and the cover plate 23 are disposed opposite each other at the upper and lower ends of the support 20, and the multiple side plates 24 are respectively connected to the base plate 22 and the cover plate 23 to form a stable frame structure. The first liquid guide port 241 and the second liquid guide port 242 are respectively disposed on the opposite side plates 24 so that the liquid medium can flow through the battery cell 50 to achieve effective heat exchange. In addition, the heating film 30 is installed on the side of the base plate 22 away from the mounting cavity 21, providing additional heating support for the battery cell 50 without directly contacting it, ensuring the temperature stability of the battery cell 50 under different environments.

[0053] In this embodiment, the heating film 30 is installed on the outside of the base plate 22, isolating it from the battery cell 50. This effectively prevents the direct high temperature of the heating film 30 from affecting the battery cell 50, ensuring uniform and stable temperature conduction. Heat can be gradually transferred to the bottom area of ​​the battery cell 50 through the base plate 22, thereby achieving a uniform heat diffusion effect. This indirect heating method effectively reduces drastic temperature fluctuations in the battery cell 50, lowers the risk of local overheating, helps extend the lifespan of the battery cell 50, and improves the overall system safety.

[0054] Furthermore, the bracket 20 is designed with a sliding groove 27, and the cover plate 23 is slidably connected to the sliding groove 27. The sliding groove 27 allows the cover plate 23 to slide open or close flexibly during installation and maintenance, thereby improving the convenience of cell 50 replacement and assembly. The sliding connection maintains the structural stability while providing a quick opening channel for operation, which helps to optimize the loading and unloading efficiency of the cell 50.

[0055] In this embodiment, the cover plate 23 is opened quickly by sliding through the groove 27, allowing users to easily place or replace the battery cell 50. Compared with the traditional bolt-fixed structure, the sliding connection reduces the steps of opening and closing. Users only need to gently slide the cover plate 23 to open the top of the bracket 20, thereby directly installing or removing the battery cell 50, eliminating the tedious disassembly and assembly process, simplifying the operation, saving time, and effectively improving the maintenance efficiency of the system.

[0056] This utility model provides a battery pack, including a battery cell 50 and the aforementioned housing structure, with the battery cell 50 disposed in the mounting cavity 21 of the housing structure. The battery pack takes into account the protection and heat dissipation requirements of the battery cell 50, and can maintain the temperature of the battery cell 50 stable during operation, avoiding performance degradation or damage due to overheating or low-temperature environments.

[0057] In this embodiment, the liquid guiding system within the housing structure ensures that the liquid medium can effectively flow through the cell 50 for heat exchange, maintaining a uniform temperature of the cell 50 during operation. Furthermore, the heating film 30 within the housing structure further enhances the thermal management performance of the cell 50. When the battery pack is in a low-temperature environment, the heating film 30 can provide an additional heat source for the cell 50, accelerating the temperature rise and ensuring smooth operation of the cell 50 during initial startup.

[0058] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0059] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0060] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0061] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A box structure, characterized in that, include: The shell has an injection chamber, an injection port, and an outlet. A bracket is disposed in the injection chamber. The bracket has an installation cavity and a liquid guiding cavity. The installation cavity is used to place the spaced-apart battery cells. The bracket has a first liquid guiding port and a second liquid guiding port at opposite ends. The first liquid guiding port is connected to the liquid guiding cavity, and the liquid guiding cavity is connected to the installation cavity. The second liquid guiding port is connected to both the installation cavity and the injection chamber. A heating film is disposed on one side of the bracket; A connecting tube, which connects the injection port and the first liquid guide port.

2. The box structure according to claim 1, characterized in that, The number of the first liquid guide ports is not less than two and they are spaced apart along the thickness direction of the support; the number of the second liquid guide ports is not less than two and they are spaced apart along the thickness direction of the support.

3. The box structure according to claim 2, characterized in that, The number of the first liquid guide port and the number of the second liquid guide port are equal, and the first liquid guide port and the corresponding second liquid guide port are located on the same axis.

4. A box structure according to claim 2, characterized in that, The bracket includes a partition plate, a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The partition plate is located in the mounting cavity and is connected to the side plates parallel to the base plate. One end of the partition plate is located between adjacent first liquid guide ports, and the other end of the partition plate is located between adjacent second liquid guide ports.

5. A box structure according to claim 1, characterized in that, The bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The base plate or the side plates are provided with mounting grooves for clamping the battery cells.

6. A box structure according to claim 1, characterized in that, The bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The liquid guide cavity is opened in the side plate, and the side plate is provided with a connection hole. The connection hole connects the connecting pipe and the liquid guide cavity. The first liquid guide port connects the liquid guide cavity and the mounting cavity.

7. A box structure according to any one of claims 1-6, characterized in that, The inner wall of the bracket is provided with multiple protruding structures.

8. A box structure according to claim 7, characterized in that, In the direction from the first liquid inlet to the second liquid inlet, the number of the plurality of protrusions on a unit area of ​​the support gradually decreases.

9. A box structure according to claim 1, characterized in that, The bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates, and the heating film is disposed on the side of the base plate away from the mounting cavity.

10. A box structure according to claim 1, characterized in that, The bracket includes a base plate, a cover plate, and multiple side plates. The base plate and the cover plate are opposite to each other, and the multiple side plates are respectively connected to the base plate and the cover plate. The first liquid guide port and the second liquid guide port are disposed on the opposite side plates. The bracket is provided with a sliding groove, and the cover plate is slidably connected to the sliding groove.

11. A battery pack, characterized in that, include: The battery cell and the housing structure according to any one of claims 1 to 10, wherein the battery cell is disposed in the mounting cavity of the housing structure.

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