Battery box and battery system

Abstract

The utility model discloses a battery box and a battery system, and the battery box comprises a box body which is provided with a containing cavity and is used for placing a battery pack, the box body is provided with an inlet and an outlet which are respectively communicated with the containing cavity, and the inlet and the outlet are arranged at intervals along a first direction; the air outlet part is installed in the containing cavity, a first air opening communicating with the inlet is formed in the air outlet part, and a plurality of second air openings communicating with the containing cavity are formed in the air outlet part in the second direction at intervals; the air return part is installed in the containing cavity, a third air opening communicating with the outlet is formed in the air return part, a fourth air opening communicating with the containing cavity is formed in the air return part, and the position of the second air opening and the position of the fourth air opening are oppositely arranged in the first direction; wherein the first direction is the height direction of the box body, the second direction is the length direction of the box body, and the air-cooled battery box aims at solving the technical problem that an existing air-cooled battery box is poor in temperature uniformity.

Description

Technical Field

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

[0002] With the rapid development of energy storage systems, battery performance and lifespan have become a focus of industry attention. Temperature management directly affects battery safety, lifespan, and overall performance. Currently, air-cooled systems are widely used for battery thermal management due to their simple structure and low cost. However, existing air-cooled battery boxes suffer from poor temperature uniformity in practical applications, leading to reduced battery life and limiting the improvement of overall system performance.

[0003] In air-cooled battery packs, cooling airflow is typically driven by a fan, creating air convection between battery modules. However, due to the complex internal structure of the battery pack and the limited airflow path, localized insufficient or excessive cooling often occurs, resulting in uneven temperature distribution between different battery cells or modules. This temperature difference accelerates the aging of some battery cells, causing uneven capacity decay and ultimately affecting the lifespan of the entire battery pack. Furthermore, excessively high or low temperatures can increase internal side reactions within the battery, reduce charging and discharging efficiency, and even pose safety hazards.

[0004] Therefore, the existing air-cooled battery boxes have a problem with poor temperature uniformity that urgently needs to be solved. Utility Model Content

[0005] One objective of this invention is to provide a battery box and battery system that addresses the technical problem of poor temperature uniformity in existing air-cooled battery boxes.

[0006] To achieve the above objectives, the present invention provides a solution as follows: a battery box, comprising a box body with an opening for a receiving cavity for housing a battery pack, the box body having an inlet and an outlet respectively communicating with the receiving cavity, the inlet and outlet being arranged at intervals along a first direction; an air outlet installed in the receiving cavity, the air outlet having a first air vent communicating with the inlet, and the air outlet having a plurality of second air vents communicating with the receiving cavity at intervals along a second direction; and a return air section installed in the receiving cavity, the return air section having a third air vent communicating with the outlet, and the return air section having a fourth air vent communicating with the receiving cavity, the positions of the second air vents and the fourth air vents being arranged opposite to each other along the first direction; wherein, the first direction is the height direction of the box body, and the second direction is the length direction of the box body.

[0007] Optionally, the air outlet includes a first main air duct and a first secondary air duct; the first main air duct extends along a first direction away from the return air section, the first secondary air duct extends along a second direction, and the first main air duct and the first secondary air duct are connected by a plurality of fifth air outlets, the first air outlet is located at the end of the first main air duct away from the first secondary air duct, and the second air outlet is located at the end of the first secondary air duct close to the first main air duct.

[0008] Optionally, the fifth air vent is located between the adjacent second air vent.

[0009] Optionally, the opening length of the second air outlet gradually decreases from the middle to both ends of the first auxiliary air duct.

[0010] Optionally, the return air section includes a second main air duct and a second auxiliary air duct; the second main air duct extends along a first direction away from the air outlet, the second auxiliary air duct extends along a second direction, the second main air duct is connected to the second auxiliary air duct through a sixth air outlet, the third air outlet is located at the end of the second main air duct away from the second auxiliary air duct, and the fourth air outlet is located at the end of the second auxiliary air duct close to the second main air duct.

[0011] Optionally, the length B of the fourth air vent and the length T of the box along the second direction satisfy: 0.7T≤B≤0.9T.

[0012] To achieve the above objectives, the present invention also provides a solution: a battery system, which includes the aforementioned battery box and multiple battery packs, wherein the multiple battery packs are stacked in the battery box and the multiple battery packs are spaced apart in multiple rows along a second direction, and each second air vent corresponds to a row of battery packs.

[0013] Optionally, the battery pack includes: a housing with an air inlet and an air outlet along a third direction, and side air outlets on both sides of the housing along a second direction; multiple battery cells stacked along the second direction to form a battery block, and the battery blocks spaced apart along the third direction; and an exhaust fan located at the air outlet for discharging gas from inside the battery pack; wherein, the third direction is the width direction of the housing.

[0014] Optionally, the battery pack also includes a cell clamp, which is disposed between adjacent cells and has through holes along a third direction.

[0015] Optionally, the air inlet is opposite to the cell clamp, and the side air inlet is opposite to the gap of the battery block.

[0016] Optionally, the battery pack further includes a first baffle and a second baffle; the first baffle is mounted between the housing and the battery cell along a third direction and forms a first airflow space, and the through hole communicates with the first airflow space; the second baffle is mounted between the housing and the battery cell along a second direction and forms a second airflow space, and the gap between the battery blocks communicates with the second airflow space.

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

[0018] Compared to existing air-cooled battery structures, this application arranges the second and fourth air vents opposite each other along the height of the battery pack, allowing the cooling airflow to evenly cover the entire battery pack in the vertical direction, effectively reducing temperature unevenness. Simultaneously, the second air vents are spaced apart along the length of the battery pack, enabling more even airflow diffusion within the pack and preventing uneven heat dissipation caused by concentrated airflow in specific areas. This further improves the heat dissipation uniformity within the battery pack, reduces the temperature difference between individual cells, and thus effectively extends the battery's lifespan. 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 the battery box provided in an embodiment of the present invention;

[0021] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A cross-sectional view along the AA direction;

[0022] Figure 3 This is a schematic diagram of the air outlet provided in an embodiment of the present invention;

[0023] Figure 4 This is provided by the embodiment of the present utility model. Figure 3 Cross-sectional view along the BB direction;

[0024] Figure 5 This is a schematic diagram of the return air section provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the battery pack provided in an embodiment of the present invention;

[0026] Figure 7 This is provided by the embodiment of the present utility model. Figure 6 A cross-sectional view along the CC direction;

[0027] Figure 8 This is provided by the embodiment of the present utility model. Figure 6 A cross-sectional view along the DD direction;

[0028] Figure 9 This is provided by the embodiment of the present utility model. Figure 6 A magnified view of a portion of region A in the middle;

[0029] Figure 10 This is provided by the embodiment of the present utility model. Figure 6 A magnified view of a portion of region B in the middle.

[0030] Explanation of icon numbers:

[0031] 10. Battery box; 11. Box body; 111. Receiving cavity; 112. Inlet; 113. Outlet; 12. Air outlet; 121. First main air duct; 122. First secondary air duct; 123. First air vent; 124. Second air vent; 125. Fifth air vent; 13. Return air section; 131. Second main air duct; 132. Second secondary air duct; 133. Third air vent; 134. Fourth air vent; 135. Sixth air vent; 20. Battery pack; 21. Shell; 211. Air inlet; 212. Air outlet; 213. Side air vent; 22. Battery block; 221. Battery cell; 23. Exhaust fan; 24. Battery cell clamping plate; 241. Through hole; 251. First wind baffle; 252. Second wind baffle; 253. First airflow space; 254. Second airflow space. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the battery box 10 provided in this embodiment of the utility model. Figure 2 This is provided by the embodiment of the present utility model. Figure 1A cross-sectional view along the AA direction. Figure 1 The X direction is the second direction, the Y direction is the third direction, and the Z direction is the first direction.

[0036] This utility model provides a battery box 10 to optimize the airflow distribution of the air-cooling system and improve the temperature uniformity inside the battery box 10. The battery box 10 includes a box body 11, an air outlet 12, and an air return section 13. The box body 11 has a receiving cavity 111 for housing the battery pack 20, and the box body 11 has an inlet 112 and an outlet 113, which are respectively connected to the receiving cavity 111. The inlet 112 and the outlet 113 are arranged at intervals along a first direction (i.e., the height direction of the box body 11) and are respectively used to introduce cooling airflow and exhaust heated airflow.

[0037] In this structure, the air outlet 12 is fixedly installed inside the receiving cavity 111 and has a first air vent 123 communicating with the inlet 112. At the same time, multiple second air vents 124 are arranged at intervals along the second direction (i.e., the length direction of the housing 11), and the second air vents 124 communicate with the receiving cavity 111. Through the structure of the air outlet 12, the cooling airflow can enter from the first air vent 123 and be evenly distributed to the area around the battery pack 20 through the multiple second air vents 124, thereby avoiding local overcooling or overheating caused by a single air inlet 211.

[0038] Correspondingly, the return air section 13 is also disposed within the receiving cavity 111, and is provided with a third air outlet 133 communicating with the outlet 113 and a fourth air outlet 134 communicating with the receiving cavity 111. Through the structure of the return air section 13, the cooling airflow passes through the battery pack 20 and flows into the return air section 13 from the fourth air outlet 134, and finally converges through the third air outlet 133 to be discharged from the outlet 113, forming a complete airflow circulation path. Furthermore, the second air outlet 124 and the fourth air outlet 134 are arranged opposite to each other in the first direction.

[0039] In this embodiment, airflow is introduced into the housing 11 through the air outlet 12 and discharged outside the housing 11 through the return air outlet 13, forming a complete heat exchange cycle, allowing the cooling airflow to fully flow through the battery pack 20. Furthermore, the second air vent 124 and the fourth air vent 134 are arranged opposite each other in the first direction, ensuring that the cooling airflow evenly covers the entire battery pack 20 in the height direction, effectively reducing temperature unevenness. Simultaneously, in the second direction, the spaced arrangement of the second air vents 124 allows the airflow to diffuse more evenly within the housing 11, preventing uneven heat dissipation caused by airflow concentration in specific areas. Compared to a traditional air-cooled battery box 10, this embodiment significantly improves the heat dissipation uniformity within the battery box 10 and reduces the temperature difference between individual cells by optimizing the airflow channels and vent arrangement, thereby effectively extending the battery's lifespan.

[0040] Further, please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the air outlet 12 provided in this embodiment of the utility model. Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A cross-sectional view along the BB direction. In some embodiments, to optimize the distribution of cooling airflow, the air outlet 12 may specifically include a first main air duct 121 and a first secondary air duct 122. The first main air duct 121 extends along a first direction (i.e., the height direction of the housing 11) and is arranged away from the return air section 13, so that the cooling airflow can enter the battery box 10 from top to bottom. The first secondary air duct 122 extends along a second direction (i.e., the length direction of the housing 11) and is interconnected with the first main air duct 121 to form an airflow delivery network, so as to ensure that the cooling air can evenly cover the entire battery pack 20.

[0041] The first main air duct 121 and the first secondary air duct 122 are connected by multiple fifth air vents 125 to ensure effective airflow between them, thus forming a reasonable air-cooling path. A first air vent 123 is located at the end of the first main air duct 121 furthest from the first secondary air duct 122, used to introduce external cooling airflow, which is initially delivered through the first main air duct 121. Subsequently, the cooling airflow enters the first secondary air duct 122 through the fifth air vents 125 distributed on the first main air duct 121 and diffuses along the second direction, allowing the cooling air to cover the entire length of the battery box 10. Simultaneously, a second air vent 124 is located at the end of the first secondary air duct 122 near the first main air duct 121. After the cooling airflow is evenly distributed through the first secondary air duct 122, it is discharged into the receiving cavity 111 through the second air vent 124, preventing airflow concentration in localized areas and thus improving the overall heat dissipation effect.

[0042] In this embodiment, due to the function of the first main air duct 121, the airflow is fully guided before entering the battery box 10, and is evenly distributed to the first secondary air duct 122 under the action of the fifth air outlet 125, achieving a more stable airflow. Compared with the traditional single air inlet structure, this solution can improve the uniformity of cooling airflow distribution inside the battery box 10, reduce the temperature difference between battery cells, reduce the risk of local overheating, and thus improve the safety and service life of the power battery. In addition, the modular design of this structure facilitates optimization and adjustment, making it adaptable to the application requirements of battery boxes 10 with different specifications and layouts, improving the adaptability and flexibility of the air-cooling system.

[0043] Furthermore, in order to optimize the uniformity of cooling airflow in the second direction (i.e., the length direction of the housing 11), in some embodiments, the layout of the plurality of fifth air vents 125 between the first main air duct 121 and the first secondary air duct 122 has been optimized. Specifically, the fifth air vents 125 are arranged between adjacent second air vents 124, thereby forming a more uniform airflow distribution within the air duct system.

[0044] The cooling airflow is first delivered through the first main air duct 121, and then gradually enters the first secondary air duct 122 via the fifth air outlet 125. Finally, it is delivered to the battery pack 20 via the second air outlet 124. In this embodiment, because the fifth air outlet 125 is located between adjacent second air outlets 124, the cooling airflow in the second direction is better diffused, preventing excessive local airflow concentration. This arrangement effectively avoids the common "airflow short-circuit" or "cooling blind zone" phenomena in traditional air-cooled systems, where some areas may cool down too quickly due to excessive airflow, while other areas may overheat due to insufficient cooling.

[0045] Furthermore, the optimized position of the fifth air vent 125 reduces turbulence and resistance losses in the cooling airflow before it enters the second air vent 124, resulting in a more stable and smoother airflow throughout the entire duct system. This not only helps improve cooling efficiency but also reduces fan energy consumption and increases the overall energy efficiency ratio of the air-cooled system.

[0046] In some optimized embodiments, the opening length of the second air vent 124 is designed differently according to the airflow distribution characteristics to improve the uniformity of the cooling airflow in the second direction (i.e., the length direction of the housing 11). Specifically, the opening length of the second air vent 124 gradually decreases from the middle to both ends of the first secondary air duct 122, thereby optimizing the diffusion effect of the cooling airflow and ensuring a more uniform temperature distribution throughout the battery housing 10.

[0047] The core principle is that the flow characteristics of the cooling airflow are affected by the pressure distribution within the duct when it propagates along the second direction. Typically, when the airflow flows in the first secondary duct 122, the airflow density is higher in the central region. As the airflow diffuses towards both ends, the duct structure restricts the flow, causing the air vents near the ends to attract more airflow, resulting in relatively larger airflow at both ends. If all the second air vents 124 have the same opening length, the airflow at the central vent will be smaller, while the airflow at the end vents will be larger. This may lead to excessive concentration of cooling airflow at both ends, while the central region is undercooled, resulting in uneven temperature distribution.

[0048] To address this issue, this embodiment gradually reduces the opening length of the second air vent 124, resulting in a larger opening in the middle of the first secondary air duct 122 to increase the cooling airflow in that area, while the openings at both ends are smaller to limit airflow. This effectively balances the distribution of cooling airflow throughout the second direction, ensuring all battery cells receive uniform cooling and preventing localized overheating or underheating.

[0049] Further, please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the return air section 13 provided in an embodiment of the present invention. In some optimized embodiments, in order to optimize the airflow recovery path, the return air section 13 may specifically include a second main air duct 131 and a second auxiliary air duct 132, so as to reasonably guide the airflow and ensure that the heated air is smoothly discharged from the housing 11 to reduce heat retention.

[0050] Specifically, the second main air duct 131 extends along the first direction (i.e., the height direction of the housing 11) and is arranged away from the air outlet 12. Simultaneously, the second auxiliary air duct 132 extends along the second direction (i.e., the length direction of the housing 11), forming a connection with the second main air duct 131, thereby ensuring that waste heat air from different areas can smoothly converge into the return air path. The second main air duct 131 and the second auxiliary air duct 132 are connected by a sixth air outlet 135, allowing hot air to enter the second main air duct 131 from the second auxiliary air duct 132 and converge at the outlet 113 along a predetermined path, achieving efficient exhaust.

[0051] In this embodiment, the third air vent 133 is located at the end of the second main air duct 131 away from the second secondary air duct 132, and is used to discharge the airflow after heat exchange in the battery pack 20, so as not to stagnate inside the battery box 10, thereby reducing the risk of local overheating. The fourth air vent 134 is located at the end of the second secondary air duct 132 close to the second main air duct 131, and the airflow from all directions can be efficiently gathered into the return air channel and finally flow to the outlet 113 to be discharged from the box 11.

[0052] In some embodiments, in order to optimize the flow characteristics of the return air system and enable waste heat air to smoothly enter the second auxiliary air duct 132 through the fourth air outlet 134, the size of the fourth air outlet 134 is optimized so that its length B and the total length T of the housing 11 along the second direction (i.e. the length direction of the housing 11) satisfy the following relationship: 0.7T≤B≤0.9T.

[0053] In this embodiment, the size setting aims to ensure sufficient return air capacity while avoiding problems caused by excessively long or short vents. Specifically, if the length B of the fourth vent 134 is less than 0.7T, the effective opening area of ​​the return air channel is small, which may increase return air resistance, thereby affecting the efficiency of hot air exhaust and reducing the heat dissipation effect inside the battery box 10. Simultaneously, a smaller vent may cause airflow to concentrate in a specific area, forming a hot spot with a locally high temperature, which is detrimental to temperature uniformity control.

[0054] On the other hand, if the length B of the fourth air vent 134 exceeds 0.9T, the opening area of ​​the vent will be too large, which may lead to an overly dispersed distribution of the return airflow, weakening the guiding effect of the return air system and thus affecting the overall flow path of the cooling airflow. Setting the length B of the fourth air vent 134 between 70% and 90% of the length T of the housing 11 can ensure sufficient return air capacity while avoiding the problem of local airflow concentration or dispersion, thereby optimizing the performance of the cooling system.

[0055] The present invention also provides a battery system, which includes the battery box 10 and multiple battery packs 20. Through a specific air-cooling system, the heat dissipation effect of the battery pack is effectively improved and the temperature management of the battery pack 20 is optimized.

[0056] In this battery system, multiple battery packs 20 are stacked inside the battery box 10 and arranged at intervals along the second direction (i.e., the length direction of the box 11) to form multiple rows of battery packs 20. Each row of battery packs 20 extends along the first direction and is positioned opposite to a second air vent 124, so that each row of battery packs 20 can receive the cooling airflow evenly.

[0057] In this embodiment, the cooling airflow from each second air vent 124 can be precisely directed to the corresponding battery pack 20 column, ensuring sufficient airflow for each battery pack 20 during heat dissipation. This prevents overheating of local battery packs 20 due to insufficient airflow, which could affect the performance and safety of the entire battery pack. Furthermore, the stacked arrangement of multiple battery packs 20 enables the entire battery system to achieve efficient energy storage and utilization within a limited space.

[0058] In some optimized embodiments, please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of the battery pack 20 provided in this embodiment of the present invention. Figure 7 This is provided by the embodiment of the present utility model. Figure 6 Cross-sectional view in the CC direction. The structure of the battery pack 20 has been further optimized to improve heat dissipation efficiency and ensure that cooling airflow can effectively flow through each component of the battery pack 20.

[0059] Specifically, the battery pack 20 includes a housing 21, multiple battery cells 221, and an exhaust fan 23. The housing 21 has an air inlet 211 and an air outlet 212 in a third direction (i.e., the width direction of the housing 11), and side air outlets 213 are provided on both sides in a second direction (i.e., the length direction of the housing 11). This allows cooling airflow to enter the battery pack 20 from multiple directions, ensuring that the airflow is evenly distributed and improving the heat dissipation effect.

[0060] Inside the battery pack 20, battery cells 221 are stacked along a second direction to form battery blocks 22, and battery blocks 22 are spaced apart along a third direction. This stacking and arrangement method can make full use of the space in the housing 11 and allow each battery cell 221 to receive uniform airflow for cooling, thereby reducing the risk of localized overheating. An exhaust fan 23 is also provided inside the battery pack 20, and the exhaust fan 23 is installed at the air outlet 212.

[0061] In this embodiment, the flow path of the cooling airflow is as follows: First, the cooling airflow flows into the battery pack 10 through the second air inlet 124 and flows towards the fourth air inlet 134 along the first direction (i.e., the height direction of the pack 11). During this process, the exhaust fan 23 creates a negative pressure inside the battery pack 20, which in turn causes the cooling airflow to flow into the battery pack 20 through the air inlet 211 and the side air inlet 213, carrying away the heat generated by the battery cells 221. The airflow is finally discharged through the air outlet 212 and finally converges at the fourth air inlet 134, exiting the battery pack 10 along the return air section 13.

[0062] Through the coordinated action of multiple air inlets 211 and side vents 213, and the guiding effect of the exhaust fan 23, the cooling airflow can evenly cover each cell 221 of the entire battery pack 20, ensuring that the entire battery pack 20 receives effective heat dissipation. By controlling the airflow path and negative pressure environment, this embodiment can improve the heat dissipation efficiency of the battery pack 20, avoid uneven temperature problems, and extend the service life of the battery pack 20. In addition, the entire heat dissipation system has a compact structure, effectively improving the space utilization of the battery system while maintaining high-efficiency thermal management performance.

[0063] Further, please refer to Figure 8 , Figure 8 This is provided by the embodiment of the present utility model. Figure 6 A cross-sectional view along the DD direction. In some embodiments, the battery pack 20 further includes a cell 221 clamping plate, which is disposed between adjacent cells 221 and has through holes 241 along a third direction (i.e., the width direction of the housing 11). This forms a heat dissipation channel between the cells 221, further improving the heat dissipation effect.

[0064] In this embodiment, the cell 221 clamp not only physically fixes adjacent cells 221 together, ensuring the stability and structural integrity of the cells 221, but also forms a heat dissipation channel between the cells 221. This allows cooling airflow to pass through the through holes 241 in the clamp, enhancing airflow between the cells 221. The presence of the through holes 241 promotes airflow between the cells 221, thereby helping to remove the heat generated by the cells 221 and preventing the cells 221 from overheating and affecting their performance and lifespan.

[0065] In some optimized embodiments, the cooling airflow path of the battery pack 20 is optimized. Specifically, the air inlet 211 is opposite to the cell 221 clamping plate, and the side air outlet 213 is opposite to the gap channel of the battery block 22, so as to reduce airflow resistance and enable the airflow to flow evenly through all areas of the battery pack 20, thereby improving heat dissipation efficiency.

[0066] The air inlet 211 is opposite to the cell 221 clamping plate. Since the cell 221 clamping plate has through holes 241 along a third direction, cooling airflow from the outside can directly flow into the through holes 241, effectively flowing between the cells 221 and helping to remove the heat generated by the cells 221. The initial input position of the airflow is close to the cell 221 clamping plate, allowing the cooling airflow to quickly enter the battery pack 20 and exchange heat with the cells 221, thereby improving the heat dissipation capacity of the battery pack 20.

[0067] At the same time, the side vent 213 is opposite to the gap channel of the battery block 22. The gap between the battery blocks 22 provides a free flow channel for the airflow. After the airflow enters the battery pack 20 from the side vent 213, it can flow smoothly in these gap channels and carry away the heat generated by the battery block 22.

[0068] In this embodiment, the gaps and channels inside the battery pack 20 are utilized. By aligning the air inlet 211 with the cell 221 clamp and the side air outlet 213 with the gap channel of the battery block 22, the cooling airflow is precisely guided into the gaps and channels inside the battery pack 20. This allows the airflow to cover every part of the battery pack 20, ensuring that the entire battery pack 20 maintains a relatively uniform temperature during operation, thereby improving the battery's working efficiency and service life.

[0069] Further, please refer to Figure 9 and Figure 10 , Figure 9 This is provided by the embodiment of the present utility model. Figure 6 A magnified view of a portion of region A in the middle. Figure 10 This is provided by the embodiment of the present utility model. Figure 6A partial enlarged view of region B. In some embodiments, the battery pack 20 also includes a first baffle 251 and a second baffle 252, designed to enhance the precise guidance of airflow to ensure that cooling airflow can flow efficiently through key areas inside the battery pack 20.

[0070] Specifically, the first baffle plate 251 is installed between the housing 21 and the battery cell 221 along a third direction (i.e., the width direction of the housing 11), and its position forms a first airflow space 253. The first airflow space 253 communicates with the through hole 241 in the battery cell 221 clamping plate through a through hole 241. The second baffle plate 252 is installed between the housing 21 and the battery cell 221 along a second direction (i.e., the length direction of the housing 11), forming a second airflow space 254, and this second airflow space 254 communicates with the gap channel of the battery block 22.

[0071] In this embodiment, the first baffle plate 251 and the second baffle plate 252 not only provide physical support and isolation, but more importantly, they guide the airflow direction, allowing the cooling airflow to flow efficiently and evenly through all parts of the battery pack 20. The first baffle plate 251, through the formed first airflow space 253, precisely guides the airflow into the through holes 241 of the cell 221 clamping plate, ensuring that after entering the battery pack 20, the airflow can quickly pass through the heat dissipation channels between the cell 221 clamping plates, carrying away the heat generated by the cell 221 and preventing localized overheating. Simultaneously, the second baffle plate 252, through the formed second airflow space 254, guides the airflow precisely into the gap channels between the battery blocks 22. The gap channels between the battery blocks 22 provide a smooth flow path for the airflow, allowing it to flow evenly through each row of battery blocks 22, avoiding uneven heat dissipation caused by insufficient localized airflow.

[0072] 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.

[0073] 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 box characterized by, The battery box comprises: a box body provided with a receiving cavity for accommodating a battery pack, the box body being provided with an inlet and an outlet respectively communicating with the receiving cavity, the inlet and the outlet being arranged at intervals along a first direction; an air outlet portion installed in the receiving cavity, the air outlet portion being provided with a first air port communicating with the inlet, the air outlet portion being provided with a plurality of second air ports communicating with the receiving cavity at intervals along a second direction; an air return portion installed in the receiving cavity, the air return portion being provided with a third air port communicating with the outlet, the air return portion being provided with a fourth air port communicating with the receiving cavity, the positions of the second air ports and the fourth air port being oppositely arranged along the first direction; wherein the first direction is the height direction of the box body, and the second direction is the length direction of the box body.

2. The battery box of claim 1, wherein, The air outlet portion comprises a first main air duct and a first auxiliary air duct. The first main air duct extends away from the air return portion along the first direction, the first auxiliary air duct extends along the second direction, the first main air duct and the first auxiliary air duct communicate through a plurality of fifth air ports, the first air port is arranged at one end of the first main air duct away from the first auxiliary air duct, and the second air port is arranged at one end of the first auxiliary air duct close to the first main air duct.

3. The battery box of claim 2, wherein, The fifth air ports are arranged between adjacent second air ports.

4. The battery box of claim 2, wherein, From the middle to both ends of the first auxiliary air duct, the opening length of the second air port gradually decreases.

5. The battery box of claim 1, wherein, The air return portion comprises a second main air duct and a second auxiliary air duct. The second main air duct extends away from the air outlet portion along the first direction, the second auxiliary air duct extends along the second direction, the second main air duct communicates with the second auxiliary air duct through a sixth air port, the third air port is located at one end of the second main air duct away from the second auxiliary air duct, and the fourth air port is located at one end of the second auxiliary air duct close to the second main air duct.

6. A battery box according to claim 5, wherein The length B of the fourth air port and the length T of the box body along the second direction satisfy: 0.7T≤B≤0.9T.

7. A battery system characterized by, The battery box comprises:

8. The battery system of claim 7, wherein, a box body provided with a receiving cavity for accommodating a battery pack, the box body being provided with an inlet and an outlet respectively communicating with the receiving cavity, the inlet and the outlet being arranged at intervals along a first direction; an air outlet portion installed in the receiving cavity, the air outlet portion being provided with a first air port communicating with the inlet, the air outlet portion being provided with a plurality of second air ports communicating with the receiving cavity at intervals along a second direction; an air return portion installed in the receiving cavity, the air return portion being provided with a third air port communicating with the outlet, the air return portion being provided with a fourth air port communicating with the receiving cavity, the positions of the second air ports and the fourth air port being oppositely arranged along the first direction; wherein the first direction is the height direction of the box body, and the second direction is the length direction of the box body.

9. The battery system of claim 8, wherein, The battery box comprises:

10. The battery system of claim 9, wherein, a box body provided with a receiving cavity for accommodating a battery pack, the box body being provided with an inlet and an outlet respectively communicating with the receiving cavity, the inlet and the outlet being arranged at intervals along a first direction; 11. The battery system of claim 10, wherein, an air outlet portion installed in the receiving cavity, the air outlet portion being provided with a first air port communicating with the inlet, the air outlet portion being provided with a plurality of second air ports communicating with the receiving cavity at intervals along a second direction; an air return portion installed in the receiving cavity, the air return portion being provided with a third air port communicating with the outlet, the air return portion being provided with a fourth air port communicating with the receiving cavity, the positions of the second air ports and the fourth air port being oppositely arranged along the first direction; wherein the first direction is the height direction of the box body, and the second direction is the length direction of the box body. The battery box comprises: a box body provided with a receiving cavity for accommodating a battery pack, the box body being provided with an inlet and an outlet respectively communicating with the receiving cavity, the inlet and the outlet being arranged at intervals along a first direction; an air outlet portion installed in the receiving cavity, the air outlet portion being provided with a first air port communicating with the inlet, the air outlet portion being provided with a plurality of second air ports communicating with the receiving cavity at intervals along a second direction; an air return portion installed in the receiving cavity, the air return portion being provided with a third air port communicating with the outlet, the air return portion being provided with a fourth air port communicating with the receiving cavity, the positions of the second air ports and the fourth air port being oppositely arranged along the first direction; wherein the first direction is the height direction of the box body, and the second direction is the length direction of the box body. The first wind baffle is arranged between the shell and the battery cell along the third direction and forms a first airflow space, and the through hole is communicated with the first airflow space; The second wind baffle is arranged between the shell and the battery cell along the second direction and forms a second airflow space, and the battery block gap is communicated with the second airflow space.

Images