Battery pack

Abstract

The battery pack comprises a box body, a battery cell assembly and a fixing assembly, the box body is provided with a containing cavity, the containing cavity is provided with an opening, the battery cell assembly is arranged in the containing cavity of the box body, the fixing assembly comprises a support and a top cover structure, the support is arranged in the containing cavity and arranged at the end of the battery cell assembly, and the top cover structure is arranged on the support. The top cover structure covers the opening, the support is connected with the top cover structure, the top cover structure is provided with an overflowing cavity, the side, away from the box body, of the top cover structure is provided with a liquid injection opening communicated with the overflowing cavity, the side, close to the box body, of the top cover structure is provided with a first overflowing hole communicated with the overflowing cavity, and the support is provided with a second overflowing hole. And the first overflowing hole and the second overflowing hole are communicated with the overflowing cavity and the accommodating cavity, so that the technical problem that the top cooling effect in an immersed cooling system is poor is solved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] In modern battery systems, thermal management has become a key technology for ensuring battery performance and safety. Especially in high-energy-density battery systems, the heat generated during charging and discharging increases significantly, necessitating effective cooling to prevent overheating damage. Among various cooling methods, immersion cooling is increasingly widely used due to its high cooling efficiency and ability to directly contact the battery surface. However, while immersion cooling can theoretically achieve relatively uniform heat dissipation, practical applications often face the problem of restricted fluid flow, particularly in the top region of the battery pack. Coolant flow is often difficult at this point, creating a "cooling blind zone" where the temperature can be significantly higher than other parts of the battery. This uneven temperature distribution not only accelerates the aging of battery materials and affects the overall battery lifespan but also poses a risk of localized overheating, threatening system safety.

[0003] Therefore, how to solve the problem of poor top cooling effect in immersion cooling systems has become an urgent industry challenge. Utility Model Content

[0004] One objective of this invention is to provide a battery pack that addresses the technical problem of poor top cooling performance in immersion cooling systems.

[0005] To achieve the above objectives, the present invention provides a solution as follows: a battery pack, comprising a housing with an opening in the housing; a battery cell assembly disposed within the housing; and a fixing assembly comprising a bracket and a top cover structure, wherein the bracket is disposed within the housing and at the end of the battery cell assembly, the top cover structure is disposed at the opening, the bracket is connected to the top cover structure, the top cover structure has a flow cavity, a liquid injection port communicating with the flow cavity is provided on the side of the top cover structure away from the housing, a first flow hole communicating with the flow cavity is provided on the side of the top cover structure close to the housing, the bracket has a second flow hole, and the first and second flow holes are connected to the flow cavity and the housing.

[0006] Optionally, the bracket includes a main body and a flow-through component, with a second flow-through hole formed in the main body, the flow-through component surrounding the second flow-through hole and inserted into the first flow-through hole; or the bracket includes an integrally formed main body and a flow-through component, with the second flow-through hole penetrating through the flow-through component and the main body, and the flow-through component inserted into the first flow-through hole.

[0007] Optionally, the top cover structure includes a flow channel plate and a cover plate. The flow channel plate and the cover plate are connected to form a flow cavity. The flow channel plate has a first flow hole, the cover plate has an injection port, and the box body has an outlet port. The outlet port connects the receiving cavity with the outside.

[0008] Optionally, there are multiple first flow holes, which are evenly distributed in the flow channel plate array.

[0009] Optionally, the top cover structure also includes multiple reinforcing ribs, which are fixedly connected to the flow channel plate and abut against the cover plate.

[0010] Optionally, multiple reinforcing ribs are parallel to each other and distributed within the flow cavity, and / or the number of first flow holes between adjacent reinforcing ribs is the same.

[0011] Optionally, the bracket has an injection hole that exposes the end of the battery cell assembly.

[0012] Optionally, the bracket has terminal holes, the terminals of the battery cell assembly pass through the terminal holes, and the glue injection holes are arranged around the outer periphery of the terminal holes.

[0013] Optionally, the top cover structure also includes a seal located at the connection between the flow channel plate and the cover plate.

[0014] Optionally, the battery pack also includes an adhesive layer disposed between the bracket and the top cover structure to connect the bracket and the top cover structure.

[0015] Optionally, the battery pack also includes an adhesive, which is placed between the bracket and the housing for connecting and fixing the bracket.

[0016] The beneficial effects of this utility model are as follows:

[0017] Unlike existing technologies, this application features a top cover structure on the top of the battery pack, with a flow cavity within the top cover structure. This flow cavity, along with a first flow hole in the top cover structure and a second flow hole in the support, forms a flow channel leading to the top of the battery. Coolant enters the receiving cavity through the injection port, then flows through the second and first flow holes, ultimately entering the flow cavity of the top cover structure. This allows the coolant to directly cool the top area of ​​the battery, eliminating potential cooling blind spots. The flow channel ensures that the coolant fully covers the top area of ​​the cell assembly, significantly improving the temperature distribution inside the battery pack, ensuring more uniform battery temperature, and effectively enhancing the stability and safety of the battery system. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is an exploded view of the battery pack provided in an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the bracket provided in an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the flow channel plate provided in an embodiment of the present invention;

[0022] Figure 4 This is a top view of the battery pack provided in an embodiment of the present utility model;

[0023] Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Cross-sectional view along the AA direction;

[0024] 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.

[0025] Explanation of icon numbers:

[0026] 10. Housing; 11. Receiving cavity; 12. Opening; 13. Liquid outlet; 20. Fixing assembly; 21. Bracket; 211. Second flow passage; 212. Main body; 213. Flow passage component; 214. Injection hole; 215. Terminal hole; 22. Top cover structure; 221. Flow cavity; 222. Injection port; 223. First flow passage; 224. Flow channel plate; 225. Cover plate; 226. Reinforcing rib; 227. Sealing component; 30. Battery cell assembly; 40. Adhesive layer; 50. Coolant. Detailed Implementation

[0027] 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.

[0028] Please see Figure 1 , Figure 1This is an exploded view of the battery pack provided in an embodiment of this utility model.

[0029] This utility model provides a battery pack to improve the cooling effect of the cell assembly 30. The battery pack includes a housing 10, a fixing component 20, and the cell assembly 30, wherein the housing 10 has a receiving cavity 11 for receiving and fixing the cell assembly 30. The housing 10 has an opening 12 to facilitate the installation of the cell assembly 30 and the cooling structure.

[0030] The fixing assembly 20 includes a bracket 21 and a top cover structure 22. The bracket 21 is installed inside the receiving cavity 11 and connected to the top of the cell assembly 30, while the top cover structure 22 covers the opening 12, sealing the housing 10. A flow cavity 221 is formed on the side of the top cover structure 22 near the receiving cavity 11 for the flow of coolant 50. An injection port 222 is formed on the outer side of the top cover structure 22, away from the receiving cavity 11, communicating with the flow cavity 221 to facilitate the injection and flow control of coolant 50. A first flow hole 223 communicating with the flow cavity 221 is formed on the inner side of the top cover structure 22, near the receiving cavity 11. The bracket 21 also has a second flow hole 211. The flow cavity 221 and the receiving cavity 11 are connected through the second flow hole 211 and the first flow hole 223, forming a through cooling channel between the top cover structure 22, the bracket 21, and the housing 10.

[0031] In this embodiment, the top cover structure 22 of the housing 10 has a flow cavity 221. This, along with the first flow hole 223 of the top cover structure 22 and the second flow hole 211 of the bracket 21, forms a cooling channel leading to the top of the battery. After the coolant 50 enters the housing 10 through the injection port 222, it rises continuously within the receiving cavity 11. The rising coolant 50 flows sequentially through the second flow hole 211 and the first flow hole 223, finally entering the flow cavity 221 of the top cover structure 22. This means the coolant 50 can effectively flow to the top of the battery, achieving direct cooling of the top area and eliminating potential cooling blind spots. The flow channel not only allows the coolant 50 to fully cover the top area of ​​the cell assembly 30, but also significantly improves the temperature distribution inside the battery pack through uniform coolant flow, ensuring a more uniform battery temperature and effectively improving the stability and safety of the battery system.

[0032] Further, please refer to Figure 2 , Figure 2This is a schematic diagram of the structure of the bracket 21 provided in this embodiment of the present invention. To further optimize the cooling path, the bracket 21 may further include a main body 212 and a flow-through component 213, making the cooling flow channel more precise and stable. The main body 212 is the main structure of the bracket 21, used to fix and support the battery cell assembly 30, and a second flow-through hole 211 is formed thereon to ensure that the coolant 50 can flow smoothly through the channel of the main body 212 to the top area of ​​the battery. In some embodiments, the bracket 21 may include an integrally formed main body 212 and flow-through component 213, with the second flow-through hole 211 penetrating through the flow-through component 213 and the main body 212, and the flow-through component inserted into the first flow-through hole 223.

[0033] The flow-through component 213 surrounds the outside of the second flow-through hole 211, serving as an important guiding structure for the coolant 50 flow path. The flow-through component 213 not only surrounds the second flow-through hole 211 but also extends into the first flow-through hole 223 of the top cover structure 22, forming a continuous and sealed flow path for the coolant 50. The insertion of the flow-through component 213 ensures a more sealed and stable fluid connection between the flow-through cavity 221 and the receiving cavity 11, effectively preventing leakage or flow obstruction of the coolant 50 during flow.

[0034] Meanwhile, due to the tight connection between the flow-through component 213 and the first flow-through hole 223, the coolant 50 can more effectively pass through the cooling channel to achieve directional flow, ensuring that the coolant 50 can quickly and evenly reach the top area of ​​the cell assembly 30, further avoiding the formation of cooling blind spots.

[0035] In some embodiments, the top cover structure 22 is further optimized to ensure efficient flow of coolant 50 and achieve a more uniform cooling effect. See also... Figure 1 and Figure 3 , Figure 1 This is an exploded view of the battery pack provided in an embodiment of this utility model. Figure 3This is a schematic diagram of the flow channel plate 224 provided in this embodiment of the present invention. Specifically, the top cover structure 22 includes a flow channel plate 224 and a cover plate 225, which, when connected, form a flow cavity 221 for the flow of coolant 50. The flow channel plate 224 has a first flow hole 223, which serves as the main outlet for the coolant 50 to enter the top region of the cell assembly 30. The coolant 50 flows through the second flow hole 211 of the bracket 21, enters the first flow hole 223, and finally flows to the top of the cell assembly 30. The cover plate 225 is located on the outside of the top cover structure 22 and has an injection port 222 thereon for controlling the injection and flow distribution of coolant 50. The design of the injection port 222 facilitates the entry of coolant 50 into the flow cavity 221, ensuring a continuous and stable supply of coolant 50 to the battery. Furthermore, the housing 10 has an outlet 13, which connects the inside and outside of the receiving cavity 11 for discharging coolant 50.

[0036] In this embodiment, please refer to Figures 4 to 6 , Figure 4 This is a top view of the battery pack provided in an embodiment of the present invention. Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Cross-sectional view along the AA direction. Figure 6 This is provided by the embodiment of the present utility model. Figure 5 A magnified view of a portion of area A. The flow channel plate 224 and the cover plate 225 form a flow cavity 221, allowing the coolant 50 to flow and distribute evenly within the top cover structure 22 through the first flow hole 223. After the coolant 50 is filled into the housing 10 through the injection port 222, the coolant 50 flows within the receiving cavity 11 and rises slowly from the bottom. It then flows through the second flow hole 211 of the bracket 21 to the flow element 213, and subsequently through the first flow hole 223 of the flow channel plate 224 into the flow cavity 221, i.e., the top area of ​​the cell, thereby eliminating cooling blind spots and effectively improving the cooling effect at the top of the cell. With this design, the coolant 50 efficiently and evenly covers all areas of the cell, resulting in a more uniform temperature distribution inside the battery and preventing localized overheating.

[0037] Furthermore, to ensure that the coolant 50 flows more evenly through the top region of the cell assembly 30, multiple first flow holes 223 are provided on the flow channel plate 224. These first flow holes 223 are evenly distributed in an array on the flow channel plate 224, forming multiple channels for the coolant 50. This allows the coolant 50 to flow into the flow cavity 221 in a dispersed and even manner from the second flow holes 211 of the support 21, thereby cooling the top of the cell assembly 30. Through this multi-hole array design, the flow of the coolant 50 is no longer limited to a single location but can cover a larger area, thus significantly improving cooling efficiency.

[0038] In this embodiment, the array distribution design of multiple first flow holes 223 effectively avoids the problem of flow concentration or flow blind spots of coolant 50 in the top region of the battery. Coolant 50 can enter the flow cavity 221 through the array of multiple first flow holes 223 to uniformly cover the entire top region of the battery. This porous flow channel layout not only increases the flow area of ​​coolant 50, but also allows coolant 50 to maintain a stable and uniform flow rate when flowing through the top of the cell assembly 30, effectively improving heat dissipation. In addition, the array layout of the first flow holes 223 can flexibly adjust their diameter, spacing and number according to the heat dissipation requirements of the battery system, thereby providing the best cooling effect for different types and specifications of batteries.

[0039] In some embodiments, to further enhance the structural strength and stability of the top cover structure 22, a plurality of reinforcing ribs 226 are designed into the top cover structure 22. The reinforcing ribs 226 are fixedly connected to the flow channel plate 224 and tightly abut against the cover plate 225, forming a stable support structure. By providing these reinforcing ribs 226 between the flow channel plate 224 and the cover plate 225, the overall compressive strength of the top cover structure 22 is significantly improved, ensuring that the top cover structure 22 can maintain its shape and structural stability during the flow of coolant 50 and in the working environment of the battery system.

[0040] In this embodiment, the addition of reinforcing ribs 226 not only increases the strength of the top cover structure 22, but also effectively guides the flow of coolant 50. When coolant 50 flows within the flow cavity 221, it flows more smoothly due to the support and guidance of the reinforcing ribs 226. The presence of reinforcing ribs 226 reduces turbulence and obstruction in the flow path of coolant 50 within the flow cavity 221, ensuring that coolant 50 can pass through the entire cooling channel uniformly and quickly. Furthermore, reinforcing ribs 226 can also alleviate deformation that may occur in the top cover structure 22 under complex operating conditions such as high temperature and vibration, maintaining the stability of the flow channel.

[0041] Furthermore, to achieve optimal structural support, multiple reinforcing ribs 226 are designed to be parallel to each other and distributed within the flow cavity 221. This arrangement not only makes the reinforcing ribs 226 structurally more stable but also evenly distributes the supporting force between the flow channel plate 224 and the cover plate 225. Through this parallel layout, each reinforcing rib 226 can bear a portion of the mechanical load in the top cover structure 22, forming a balanced overall support network, thereby effectively improving the compressive strength and deformation resistance of the top cover structure 22.

[0042] In this embodiment, the parallel and uniform distribution of the reinforcing ribs 226 ensures smooth flow of the coolant 50 within the flow cavity 221. After the coolant 50 enters the flow cavity 221, the parallel reinforcing ribs 226 do not significantly obstruct its flow; instead, they guide it to some extent, promoting its flow along the gaps between the parallel reinforcing ribs 226. Furthermore, due to the uniformity of the reinforcing ribs 226 arrangement, the flow velocity and direction of the coolant 50 within the entire flow cavity 221 are well controlled, avoiding poor cooling performance caused by uneven flow channels or turbulent flow.

[0043] Meanwhile, the parallel reinforcing ribs 226 make the top cover structure 22 more regular and the evenly distributed structure not only improves the overall impact resistance of the top cover structure 22, but also reduces fatigue and deformation caused by uneven stress between the cover plate 225 and the flow channel plate 224 during long-term use.

[0044] Furthermore, to ensure the uniformity of the cooling flow channels, the number of first flow holes 223 between adjacent reinforcing ribs 226 is designed to be the same, ensuring that the coolant 50 can flow uniformly throughout the flow cavity 221 and cover the top area of ​​the cell assembly 30. Through this symmetrical and uniform arrangement of the first flow holes 223, the coolant 50 can pass more smoothly through the channels between adjacent reinforcing ribs 226, avoiding the problem of insufficient local cooling caused by uneven distribution of flow channel holes. In addition, the uniform arrangement helps maintain fluid pressure balance within the flow cavity 221, allowing the coolant 50 to form a stable cooling coating layer in the top area of ​​the battery.

[0045] In this embodiment, the uniform distribution of the first flow holes 223 allows the coolant 50 to stably cover the top of the cell through the uniformly arranged first flow holes 223, thereby maintaining a uniform temperature distribution; the first flow holes 223 provide excellent cooling for the cell assembly 30, enabling the battery pack to maintain efficient thermal management under various operating conditions.

[0046] In some embodiments, the bracket 21 also has an injection hole 214, which exposes the end of the cell assembly 30 for injecting adhesive around the cell assembly 30, thereby more securely connecting the cell assembly 30 to the bracket 21. The filling of the adhesive not only further enhances the fixing effect of the cell assembly 30, but also plays a certain role in buffering, improving the impact resistance of the battery system under vibration or impact conditions.

[0047] In this embodiment, the injection of adhesive through the injection hole 214 ensures the secure positioning of the battery cell, effectively preventing the component from loosening or shifting during long-term use.

[0048] Furthermore, a terminal hole 215 is provided on the bracket 21 for inserting the terminal of the battery cell assembly 30. The terminal of the battery cell assembly 30 is inserted into the bracket 21 through the terminal hole 215, so that the electrode of the battery cell assembly 30 is connected to the external circuit system, and the glue injection hole 214 is arranged around the outer periphery of the terminal hole 215.

[0049] In this embodiment, the injection holes 214 are distributed around the outer periphery of the terminal post hole 215 to enhance the connection strength between the bracket 21 and the battery cell, ensure the firm fixation of the terminal post, and prevent loosening caused by vibration or thermal expansion. The injection holes 214 are arc-shaped (or other shapes, such as elliptical, rectangular, etc.). The arc-shaped injection holes 214 can provide a better filling effect according to the geometry of the bracket 21 and the battery cell assembly 30. When designed as two, they are set on both sides of the terminal post hole 215, with the inner arc sides of the two injection holes 214 facing each other, ensuring that the glue can be injected from both sides simultaneously and evenly distributed.

[0050] In some embodiments, a seal 227 is added to the top cover structure 22 to improve its sealing performance. The seal 227 is installed at the connection between the flow channel plate 224 and the cover plate 225, forming an effective sealing barrier. The seal 227 effectively prevents leakage of the coolant 50 during its flow within the flow cavity 221, ensuring that the coolant 50 always flows within the predetermined flow channel, thus avoiding potential damage to the cell assembly 30 and other electronic components caused by liquid leakage.

[0051] In this embodiment, the seal 227 enhances the durability of the top cover structure 22, enabling it to maintain efficient sealing under different operating conditions and extending the battery pack's lifespan. Furthermore, the seal 227 provides additional cushioning for the top cover structure 22. Adding the seal 227 at the connection between the flow channel plate 224 and the cover plate 225 effectively absorbs minor displacements caused by temperature changes or vibrations, preventing sealing failure due to long-term operation.

[0052] Specifically, the seal 227 can be made of temperature- and corrosion-resistant materials, such as silicone, rubber, or special elastomer materials, to ensure that it still has excellent sealing performance under high temperature or long-term action of coolant 50.

[0053] Furthermore, the battery pack also includes an adhesive layer 40, which is disposed between the bracket 21 and the top cover structure 22, serving a connecting and fixing function. The adhesive layer 40 tightly connects the bracket 21 and the top cover structure 22, providing additional mechanical support and stability. During battery system operation, the presence of the adhesive layer 40 not only enhances the fixing effect of the cell assembly 30, but also effectively reduces the damage that external factors such as vibration and impact may cause to the cell assembly 30.

[0054] In this embodiment, the adhesive layer 40 further enhances the structural stability and durability of the battery pack. The adhesive layer 40 is evenly distributed on the support 21 to prevent the support 21 from loosening or shifting due to thermal expansion, vibration, or external impact during long-term use, thus ensuring the safe operation of the battery system.

[0055] In some embodiments, the battery pack further includes an adhesive layer disposed between the bracket 21 and the housing 10 for connecting and securing the connection portion between the bracket 21 and the battery housing 10. Specifically, the adhesive layer is disposed around the perimeter where the bracket 21 contacts the housing 10, ensuring that the bracket 21 can be securely fixed within the housing 10, thereby enhancing the mechanical connection strength between the bracket 21 and the battery housing 10.

[0056] In this embodiment, the adhesive not only strengthens the fixation between the bracket 21 and the housing 10, but also effectively reduces loosening of the contact surface caused by vibration, impact, or thermal expansion. By uniformly applying the adhesive between the bracket 21 and the housing 10, strong adhesive support can be provided for the bracket 21, preventing the bracket 21 from shifting or loosening due to external environmental factors during use.

[0057] In some embodiments, the top cover structure 22 is made of plastic and manufactured using an injection molding process. The choice of plastic material mainly considers its good formability, lightweight, corrosion resistance, and low cost, enabling the top cover to meet structural strength requirements while effectively reducing production costs and simplifying the manufacturing process.

[0058] In this embodiment, the top cover manufactured using injection molding not only ensures high precision and efficiency in the production process but also enables the precise manufacturing of complex shapes. Injection molding involves heating plastic raw materials to a molten state, then injecting them into a precisely designed mold, and finally cooling and solidifying to obtain the molded product. This process allows for mass production in a short time while ensuring consistency in size, shape, and precision for each top cover, thus guaranteeing stable product quality.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 battery pack, characterized in that, include: The housing has a receiving cavity with an opening; The battery cell assembly is disposed in the receiving cavity of the housing; A fixing component includes a bracket and a top cover structure. The bracket is disposed within the receiving cavity and at the end of the battery cell assembly. The top cover structure covers the opening. The bracket is connected to the top cover structure. The top cover structure has a flow cavity. The side of the top cover structure away from the housing has a liquid injection port communicating with the flow cavity. The side of the top cover structure close to the housing has a first flow hole communicating with the flow cavity. The bracket has a second flow hole. The first flow hole and the second flow hole communicate between the flow cavity and the receiving cavity.

2. The battery pack according to claim 1, characterized in that, The bracket includes a main body and a flow passage component. The second flow passage is formed in the main body. The flow passage component is arranged around the second flow passage and inserted into the first flow passage. Alternatively, the bracket may include an integrally formed main body and a flow passage, with the second flow passage penetrating the flow passage and the main body, and the flow passage inserted into the first flow passage.

3. A battery pack according to claim 1, characterized in that, The top cover structure includes a flow channel plate and a cover plate. The flow channel plate and the cover plate are connected to form the flow cavity. The flow channel plate has the first flow hole, the cover plate has the liquid injection port, and the box body has the liquid outlet. The liquid outlet connects the receiving cavity to the outside.

4. A battery pack according to claim 3, characterized in that, The number of the first flow passages is multiple, and the multiple first flow passages are evenly distributed in the flow channel plate array.

5. A battery pack according to claim 3, characterized in that, The top cover structure also includes multiple reinforcing ribs, which are fixedly connected to the flow channel plate and abut against the cover plate.

6. A battery pack according to claim 5, characterized in that, The plurality of reinforcing ribs are parallel to each other and distributed within the flow cavity, and / or the number of first flow holes between adjacent reinforcing ribs is the same.

7. A battery pack according to claim 5, characterized in that, The bracket has multiple injection holes, which expose the ends of the battery cell assembly.

8. A battery pack according to claim 7, characterized in that, The bracket has a terminal hole, the terminal of the battery cell assembly passes through the terminal hole, and the glue injection hole is arranged around the outer periphery of the terminal hole.

9. A battery pack according to any one of claims 3-8, characterized in that, The top cover structure also includes a sealing element, which is disposed at the connection between the flow channel plate and the cover plate.

10. A battery pack according to any one of claims 3-8, characterized in that, The battery pack also includes an adhesive layer disposed between the bracket and the top cover structure to connect the bracket and the top cover structure.

11. A battery pack according to claim 1, characterized in that, The battery pack also includes an adhesive, which is disposed between the bracket and the housing for connecting and fixing the bracket.

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