A battery box and a battery pack

Abstract

The utility model discloses a battery box and battery package, this battery box includes box and heat conduction board: the box includes box shell and sets up the box board in the box shell, forms in the box shell and has accommodation space and liquid cooling space, and the box board separates accommodation space and liquid cooling space, and accommodation space is used for setting up the electric core, and liquid cooling space is used for accommodating cooling medium, heat conduction board is connected with the box board, and heat conduction board is inserted in the accommodation space, is used for fitting the electric core. Compared with the situation that the electric core low thermal conductivity leads to the high temperature of the core in the prior art, the utility model forms multidirectional heat dissipation channel through the three -dimensional layout of heat conduction board, and the temperature distribution is balanced, avoids the local thermal stress damage, and the battery package heat management reliability and life are improved.

Description

Technical Field

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

[0002] With the increasing demand for clean energy, batteries are being widely used in various fields. During operation, battery cells generate a significant amount of heat, leading to elevated cell temperatures, especially when cells are densely packed within a battery pack, where heat accumulation is even more pronounced.

[0003] To address the aforementioned issues and optimize battery pack heat dissipation, liquid cooling solutions exist. These solutions involve installing liquid cooling pipes or plates at the bottom of the battery pack, using a flowing cooling medium to absorb and dissipate the heat generated by the battery cells. This approach leverages the high heat capacity of the cooling medium to rapidly reduce the temperature of the cell bottom, which is in direct contact with the liquid-cooled area. This establishes a basic heat conduction path, mitigating the risk of thermal runaway while maintaining the relative stability of the battery system.

[0004] However, traditional liquid cooling solutions are limited by the low thermal conductivity of the cell materials themselves, making it difficult to efficiently conduct heat from the inside of the cell to the bottom liquid-cooled area. This results in a lower temperature at the bottom of the cell near the liquid-cooling pipes, while high-temperature regions remain inside the core, creating a significant temperature gradient. This non-uniform heat distribution not only causes localized differences in material expansion but also disrupts lithium-ion migration pathways. Under long-term operation, continuous thermomechanical stress may accelerate the stripping of electrode active materials, leading to increased differences in cell aging rates and ultimately causing imbalances in the overall performance of the battery pack, severely limiting the reliability and safety of high-energy-density battery systems. Utility Model Content

[0005] One objective of this invention is to provide a battery box and battery pack that addresses the technical problem in the prior art where the liquid cooling effect is limited to the bottom of the battery cell, while the inside of the core still maintains a relatively high temperature.

[0006] To achieve the above objectives, the present invention provides a solution as follows: a battery box, comprising a box body and a heat-conducting plate; the box body includes a shell and a plate disposed within the shell, the shell forming an accommodating space and a liquid cooling space, the plate separating the accommodating space and the liquid cooling space, the accommodating space for housing battery cells, and the liquid cooling space for containing a cooling medium; the heat-conducting plate is connected to the plate and inserted into the accommodating space for fitting the battery cells.

[0007] According to one embodiment of the present invention, the battery box further includes multiple phase change guide plates. Each phase change guide plate includes a guide plate sleeve and a phase change unit encapsulated within the guide plate sleeve. The guide plate sleeve is disposed on the side of the box plate away from the liquid cooling space. Adjacent guide plate sleeves clamp heat-conducting plates, and the guide plate sleeves are used to attach the battery cells.

[0008] According to one embodiment of the present invention, the guide plate sleeve includes a first phase change plate, which is attached to the heat-conducting plate.

[0009] According to one embodiment of the present invention, the guide sleeve further includes a second phase change plate, which is attached to the box plate, and the first phase change plate and the second phase change plate are connected through a flow channel, which allows the phase change unit to flow bidirectionally.

[0010] According to one embodiment of the present invention, the accommodating space is located above the liquid cooling space in the direction of gravity; or, the accommodating space is located below the liquid cooling space in the direction of gravity.

[0011] According to one embodiment of the present invention, the battery box further includes a heat-conducting wire, one end of which is inserted into the guide plate sleeve, and the other end passes through the box plate to the liquid cooling space.

[0012] According to one embodiment of the present invention, the liquid cooling space includes a first liquid cooling zone and a second liquid cooling zone that are interconnected. The first liquid cooling zone is located at the bottom or top of the housing, and the second liquid cooling zone is arranged around the accommodating space.

[0013] According to one embodiment of the present invention, a liquid inlet and a liquid outlet are formed on the housing, the liquid inlet being connected to the first liquid cooling zone and the liquid outlet being connected to the second liquid cooling zone.

[0014] According to one embodiment of the present invention, a groove is provided on the box plate, a heat-conducting plate is inserted and seals the groove, and one end of the heat-conducting plate extends into the liquid cooling space.

[0015] To achieve the above objectives, another solution provided by this utility model is: a battery pack, which includes the battery box and battery cells provided in any of the above claims, with the battery cells disposed within the accommodating space.

[0016] This utility model has at least the following beneficial effects:

[0017] The battery box includes a box body and a heat-conducting plate: the box body includes a box shell and a box plate disposed inside the box shell. The box shell forms an accommodating space and a liquid cooling space. The box plate separates the accommodating space and the liquid cooling space. The accommodating space is used to house the battery cells, and the liquid cooling space is used to contain the cooling medium. The heat-conducting plate is connected to the box plate and is inserted into the accommodating space.

[0018] One end of the heat-conducting plate is inserted between the battery cells, while the other end contacts the battery pack or liquid cooling medium, creating an efficient heat transfer path. Utilizing the high thermal conductivity of the heat-conducting plate, heat from the battery core is rapidly transferred to the cooling medium, overcoming the limitations of traditional reliance on the battery cells' own heat conduction and significantly improving heat dissipation efficiency. Compared to existing technologies where the low thermal conductivity of the battery cells leads to high internal temperatures within the battery pack, this invention forms multi-directional heat dissipation channels through a three-dimensional layout of the heat-conducting plate, achieving a balanced temperature distribution, avoiding localized thermal stress damage, and improving the reliability and lifespan of the battery pack's thermal management. 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 cross-sectional schematic diagram of the battery box provided in an embodiment of this utility model;

[0021] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a cross-sectional schematic diagram of a battery box provided in another embodiment of the present invention;

[0023] Figure 4 This is an overall structural diagram of the battery pack with part of the casing removed, provided in an embodiment of this utility model.

[0024] Explanation of icon numbers:

[0025] 10. Housing; 11. Shell; 111. Liquid inlet; 112. Liquid outlet; 12. Panel; 121. Plate groove; 20. Containing space; 30. Liquid cooling space; 31. First liquid cooling zone; 32. Second liquid cooling zone; 40. Heat-conducting plate; 51. Guide plate sleeve; 52. Phase change unit; 53. First phase change plate; 54. Second phase change plate; 55. Flow channel; 60. Heat-conducting wire; 70. Liquid cooling medium; 80. Battery cell. Detailed Implementation

[0026] 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.

[0027] With the increasing demand for clean energy, battery applications are becoming more widespread. If the heat generated by the battery cells cannot be dissipated in time, it will lead to temperature rise and safety hazards, especially when the heat dissipation space is limited in dense stacking, which exacerbates the difficulty of thermal management. There are two main liquid cooling solutions: one is immersion liquid cooling, which involves immersing the entire cell stack in a cooling medium to achieve encapsulated cooling; the other is non-immersion liquid cooling, such as setting liquid cooling pipes or liquid cooling plates at the bottom of the battery box, where the flowing cooling medium absorbs and dissipates the heat generated by the cells.

[0028] Immersion liquid cooling directly submerges the battery cells in the cooling chamber, allowing for direct and comprehensive contact between the cooling medium and the cells. While this achieves good heat dissipation, it also presents drawbacks such as maintenance difficulties and high operating costs due to factors like cell airtightness. Non-immersion liquid cooling systems utilize cooling pipes inside the battery pack, with a portion of the cell surface in contact with these pipes. The flowing cooling medium within the pipes carries away heat. However, traditional liquid cooling is limited by the low thermal conductivity of the cells, making it difficult to efficiently transfer heat to the surfaces in contact with the cooling pipes. This results in a significant gradient between localized low temperatures and higher temperatures in other areas. This uneven heat distribution causes differences in material expansion and disrupts lithium-ion migration. Over long-term operation, this accelerates electrode material stripping, leading to an imbalance in the overall performance of the battery pack.

[0029] Please refer to Figure 1 and Figure 2 As shown, Figure 1 This is a cross-sectional schematic diagram of the battery box provided in an embodiment of this utility model. Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle.

[0030] To solve the above-mentioned technical problems, the present invention provides a solution as follows: a battery box, the battery box including a box body 10 and a heat-conducting plate 40: the box body 10 includes a box shell 11 and a box plate 12 disposed inside the box shell 11, the box shell 11 forms an accommodating space 20 and a liquid cooling space 30, the box plate 12 separates the accommodating space 20 and the liquid cooling space 30, the accommodating space 20 is used to house the battery cell 80, and the liquid cooling space 30 is used to contain the cooling medium; the heat-conducting plate 40 is connected to the box plate 12, and the heat-conducting plate 40 is inserted into the accommodating space 20 for fitting the battery cell 80.

[0031] This embodiment of the invention introduces a heat-conducting plate 40 connected to the housing 12. During battery pack operation, one end of the heat-conducting plate 40 is inserted between the battery cells 80, while the other end extends to the housing 12, directly contacting the liquid cooling medium 70, or even directly inserted into the liquid cooling space 30, thus constructing an efficient heat conduction path from the core to the liquid cooling medium 70. The heat-conducting plate 40, embedded in the gaps between the battery cells 80, can efficiently absorb heat from the core region and, due to its higher thermal conductivity than the battery cells 80, quickly transfer heat to the cooling medium within the liquid cooling space 30.

[0032] Compared to immersion liquid cooling solutions in related technologies, this embodiment separates the battery cells from the coolant using a enclosure, thereby avoiding the risks associated with direct contact between the coolant and the battery cells in immersion liquid cooling methods and reducing the requirements for cell airtightness. Furthermore, the non-immersion design makes cell installation, replacement, and maintenance more convenient. The battery cells can be directly removed or placed into the housing without draining the coolant, eliminating the complex operations involved in maintenance in immersion liquid cooling systems, reducing maintenance costs and cycles, and improving the maintainability and economy of the battery system.

[0033] Compared with the non-immersion liquid cooling solution in related technologies, although the battery cell in this embodiment is not immersed in coolant, the heat-conducting plate 40 intervenes in the internal thermal field of the core, balancing the temperature distribution inside and outside the battery cell 80. Compared with the traditional non-immersion cooling that only cools part of the core stack surface, the technical solution of this application has more heat dissipation channels, achieving a near-immersion cooling effect without immersing the battery cell. This avoids the problem of "low temperature at the bottom and high temperature in the core" caused by the low thermal conductivity of the battery cell 80 itself, reduces the mechanical stress damage to the battery cell 80 structure caused by local overheating or overcooling, and improves the thermal management reliability and service life of the battery pack.

[0034] In this embodiment, the heat-conducting plate 40 is attached to the battery cell 80, which should be understood as the surfaces of the two being close to each other being approximately parallel, in order to increase the heat dissipation efficiency of the heat-conducting plate 40 to the battery cell 80. Specifically, it can be directly attached or it can be sandwiched with certain sheet structures.

[0035] The preferred ratio of battery cell 80 to heat-conducting plate 40 is 2:1, that is, a heat-conducting plate 40 is sandwiched between every two battery cells 80, or there can be a heat-conducting plate 40 between any two adjacent battery cells 80, thereby achieving a higher density of heat-conducting plate 40 and a higher heat dissipation efficiency.

[0036] According to one embodiment of the present invention, the battery box further includes a plurality of phase change guide plates. Each phase change guide plate includes a guide plate sleeve 51 and a phase change unit 52 encapsulated in the guide plate sleeve 51. The guide plate sleeve 51 is disposed on the side of the box plate 12 away from the liquid cooling space 30. Adjacent guide plate sleeves 51 clamp the heat conduction plate 40. The guide plate sleeve 51 is used to attach the battery cell 80.

[0037] This embodiment of the invention incorporates a phase change conductor. The phase change unit 52, encapsulated within the conductor sleeve 51, undergoes a solid-liquid phase change when the cell 80 heats up. The liquid phase change material flows towards the low-temperature region along the temperature gradient, releases latent heat near the heat-conducting plate 40, and then solidifies and flows back, forming a cyclical dynamic heat transfer process. This mechanism, based on the active migration of the phase change medium, not only utilizes the high latent heat characteristics of the phase change material to rapidly absorb core heat but also enhances the directional heat transfer to the heat-conducting plate 40 and the liquid-cooled space 30 through enhanced flow, breaking through the rate limitation of traditional static heat conduction and significantly improving local heat diffusion efficiency. Simultaneously, the reciprocating motion of the phase change unit 52 continuously balances the temperature difference between the cell 80 and the cooling region, effectively preventing heat accumulation in the core and further mitigating material degradation caused by uneven temperature distribution.

[0038] For example, the phase change unit 52 contains a composite of alkane-based phase change material and nano-boron nitride, with a phase change temperature range of 45-55°C. During heat absorption, it absorbs heat from the surface of the battery cell 80 through solid-liquid phase change. When the temperature of the battery cell 80 exceeds the phase change point, the phase change material in the second phase change plate 54 melts into a liquid state and flows to the first phase change plate 53 through the flow channel 55. After contacting the low-temperature heat-conducting plate 40, it re-solidifies and releases latent heat, forming an active thermal regulation mechanism based on the circulation of the phase change medium. Correspondingly, in order to match the phase change temperature range of the phase change unit 52, the maximum temperature of the liquid cooling medium 70 should also be controlled below 45°C. This can be achieved by adjusting the flow channels in the liquid cooling space 30, adjusting the flow rate of the liquid cooling medium 70, and controlling the input temperature of the liquid cooling medium 70, ensuring that the phase change material is in the optimal working state, thereby achieving efficient heat transfer and temperature control.

[0039] It should be noted that the above technical principle analysis only applies to the commonly used solid-liquid two-phase conversion phase change unit 52. In fact, the phase change unit 52 used in the phase change conductor of this embodiment can also be a material based on other phase change principles such as solid-liquid phase change. The selection of the phase change unit 52 needs to be optimized according to the actual application environment and thermal management requirements to achieve the best heat transfer effect.

[0040] Furthermore, based on existing applications of phase change materials, the design of the phase change conductor should also consider its long-term stability. For example, a high heat-resistant material can be used as the conductor sleeve 51 for encapsulation to ensure no leakage occurs in high-temperature environments. For instance, a microporous structure can also be added to the outside of the conductor sleeve 51 to utilize the convective heat transfer that may exist within the housing 10, further improving the thermal conductivity between the cell 80 and the phase change conductor. The synergistic effect of the phase change conductor and the liquid cooling system forms a multi-layered thermal protection mechanism, significantly reducing the risk of thermal runaway in the cell 80. Its compact structure and convenient installation make it suitable for various battery modules, improving the reliability and safety of the system. This is a commonly used technique by those skilled in the art and will not be elaborated upon in this application.

[0041] According to one embodiment of the present invention, the guide sleeve 51 includes a first phase change plate 53, which is attached to the heat conduction plate 40.

[0042] In this embodiment, the first phase change plate 53 is attached to the heat-conducting plate 40. The phase change unit 52 encapsulated within the first phase change plate 53 undergoes a vaporization phase change when the cell 80 heats up. The gaseous phase change material releases latent heat near the heat-conducting plate 40 and then re-liquefies and flows back, forming a dynamic heat transfer process that repeats continuously. This mechanism based on the active migration of the phase change unit 52 not only utilizes the high latent heat characteristics of the phase change material to quickly absorb core heat, but also enhances the directional heat transfer to the heat-conducting plate 40 and the liquid cooling space 30 through enhanced flow, breaking through the rate limitation of traditional static heat conduction and significantly improving the heat diffusion efficiency of the cell 80 to the heat-conducting plate 40. At the same time, the first phase change plate 53 is sandwiched between the heat-conducting plate 40 and the cell 80. The reciprocating motion of the phase change unit 52 continuously balances the temperature difference between the cell 80 and the cooling area, effectively preventing heat accumulation in the core and further mitigating the material degradation problem caused by uneven temperature distribution.

[0043] Furthermore, the guide sleeve 51 also includes a second phase change sheet 54, which is attached to the box plate 12, and the first phase change sheet 53 and the second phase change sheet 54 are connected through a flow channel 55, which allows the phase change unit 52 to flow bidirectionally.

[0044] In this embodiment, the second phase change sheet 54 is designed to be attached to the box plate 12, that is, the phase change conductor is attached to the box plate 12. This can construct an efficient heat transfer path between the battery cell 80 and the liquid cooling system. Specifically, the phase change conductor directly contacts the surface of the box plate 12. Through the reciprocating flow generated by the internal phase change unit 52 during the solid-liquid phase change process, the heat generated by the battery cell 80 is quickly absorbed and transferred to the liquid cooling medium 70. The gaseous phase change unit 52 migrates to the heat transfer plate 40 and the box plate 12 under the drive of the temperature gradient, releases latent heat and flows back to the battery cell 80 side, forming a continuous heat transport cycle. This structure not only shortens the heat transfer distance from the battery cell 80 to the liquid cooling medium 70 by using the attached layout, but also breaks through the rate limitation of traditional static heat conduction through the dynamic flow of the phase change material, significantly improving the directional heat transfer efficiency to the liquid cooling medium 70, thereby enhancing the heat dissipation capacity of the battery cell 80.

[0045] In addition, the flow channel 55 enables bidirectional flow of the phase change unit 52 between the first phase change plate 53 and the second phase change plate 54, adding a new heat conduction path, enhancing the balanced distribution of heat, effectively preventing local overheating, and further improving the overall thermal management efficiency of the system.

[0046] Furthermore, considering the impact of the volume expansion of the phase change unit 52 after vaporization on the flow direction of the phase change unit 52, the flow channel 55 adopts a gradient microchannel design, with its cross-section gradually increasing from the second phase change plate 54 to the first phase change plate 53. It utilizes capillary action to accelerate the directional flow of the phase change unit 52 from the second phase change plate 54 to the first phase change plate 53, further enhancing the reflux efficiency of the phase change medium in the cooling state and realizing pump-free self-circulating heat dissipation.

[0047] According to one embodiment of the present invention, the accommodating space 20 is located above the liquid cooling space 30 in the direction of gravity.

[0048] In this embodiment, the accommodating space 20 is located above the liquid cooling space 30 in the direction of gravity, that is, the opening of the guide sleeve 51 faces upward, which is the same as the opening direction of the usual housing 10. When the battery cell 80 is installed into the housing 10, it is able to cooperate with the guide sleeve 51, which facilitates the assembly and replacement of the battery cell 80.

[0049] Please refer to the above as well. Figure 3 As shown, Figure 3 This is a cross-sectional schematic diagram of a battery box provided in another embodiment of the present invention.

[0050] Optionally, the accommodating space 20 is located below the liquid cooling space 30 in the direction of gravity.

[0051] In this embodiment, the accommodating space 20 is placed below the liquid-cooled space 30, making full use of gravity to guide the flow of the phase change medium, forming a self-driven circulating heat transfer system. When the battery cell 80 generates heat, the phase change unit 52 absorbs heat and vaporizes to form steam. Due to the decrease in density, the steam spontaneously diffuses upwards to the liquid-cooled space 30. After contacting the low-temperature liquid-cooled medium 70, it quickly condenses and liquefies, and drips back into the accommodating space 20 under the action of gravity. This dynamic circulation based on the synergistic effect of gas-liquid phase change and gravity significantly accelerates the bidirectional migration rate of the phase change medium between the battery cell 80 and the box plate 12, enabling heat to be efficiently transported to the liquid-cooled system in the form of steam kinetic energy. At the same time, the gas-liquid phase change process utilizes the strong heat exchange characteristics of latent heat absorption and release, combined with the continuous replenishment mechanism of liquid medium dripping back, which not only breaks through the rate bottleneck of traditional heat conduction paths, but also continuously balances the temperature gradient between the battery cell 80 and the cooling interface through circulating flow, further reducing thermal resistance and suppressing local temperature rise, achieving a simultaneous improvement in heat dissipation efficiency and system thermal balance capability.

[0052] According to one embodiment of the present invention, the battery box further includes a heat-conducting wire 60, one end of which is inserted into the guide plate sleeve 51, and the other end passes through the box plate 12 to the liquid cooling space 30.

[0053] In this embodiment, the heat-conducting wire 60 penetrates the box plate 12, establishing a multi-stage composite heat conduction path between the phase change conductor and the liquid cooling medium 70. The heat-conducting wire 60 is inserted into the conductor sleeve 51 and directly contacts the phase change unit 52. Utilizing the high thermal conductivity of the metal material, the heat absorbed by the phase change unit 52 is directly transferred to the liquid cooling space 30. The setting of the heat-conducting wire 60 not only retains the high heat capacity advantage of the latent heat transfer of the phase change material, but also achieves instantaneous and rapid heat release through the solid-state heat-conducting wire 60, effectively improving the transient heat dissipation response speed under extreme operating conditions. At the same time, it enhances the temperature balance capability between the battery cell 80 and the cooling medium, avoiding local heat accumulation caused by phase change cycle delay.

[0054] For example, the heat-conducting wire 60 is made of graphene composite copper-based material, with an adjustable diameter in the range of 0.5-2 mm, and a distribution density of 5-8 wires / cm within the heat-conducting sleeve 51. 2 The surface of the heat-conducting wire 60 is anodized to form a porous structure, which increases the contact area with the phase change material and improves the interfacial heat transfer coefficient. At the same time, the part of it extending into the liquid cooling space 30 adopts a spiral winding structure to generate turbulence in the cooling medium to enhance convective heat transfer.

[0055] According to one embodiment of the present invention, the liquid cooling space 30 includes a first liquid cooling zone 31 and a second liquid cooling zone 32 that are interconnected. The first liquid cooling zone 31 is located at the bottom or top of the housing 10, and the second liquid cooling zone 32 is arranged around the accommodating space 20.

[0056] This embodiment divides the liquid cooling space 30 into a first liquid cooling zone 31 and a second liquid cooling zone 32 surrounding the accommodating space 20, forming a three-dimensional heat dissipation layout where the bottom and sides of the battery pack cooperate with each other: the first liquid cooling zone 31 provides concentrated heat dissipation for the high heat density areas of the battery module, and works with the heat-conducting plate 40 to quickly remove the main heat flow of the battery pack; the second liquid cooling zone 32 eliminates heat dissipation blind spots through its surrounding layout, and simultaneously absorbs lateral heat diffusion from the battery cell 80 and ambient heat. The flow of the cooling medium between the first liquid cooling zone 31 and the second liquid cooling zone 32 improves the system's adaptability to non-uniform heat generation conditions, effectively ensuring the thermal safety and stability of the high energy density battery.

[0057] It should be noted that although the battery pack is used in a fixed orientation in most cases, i.e., the direction of gravity is from the top to the bottom of the housing 10, in some special cases, the top and bottom of this embodiment should be understood as the two ends of the housing 10 in the direction of cell 80 insertion, rather than absolute physical positions. Under special operating conditions, such as a side-mounted vertical blade battery system, the technical solution of this embodiment can still maintain efficient heat transfer and balance through the synergistic effect of the heat-conducting plate 40 and the cooling medium, ensuring the temperature stability of the cell 80, preventing the risk of thermal runaway, and improving the heat dissipation reliability of the system under various postures.

[0058] Furthermore, the housing 11 has a liquid inlet 111 and a liquid outlet 112. The liquid inlet 111 is connected to the first liquid cooling zone 31, and the liquid outlet 112 is connected to the second liquid cooling zone 32.

[0059] In this embodiment, the liquid inlet 111 is connected to the first liquid cooling zone 31, and the liquid outlet 112 is connected to the second liquid cooling zone 32. This allows the cooling medium in the narrower second liquid cooling zone 32 to overflow and be discharged. The flow rate is relatively slow, which avoids the liquid cooling medium 70 directly rushing into the second liquid cooling zone 32, causing a dead zone where the liquid cooling medium 70 is stuck in the area far from the liquid inlet 111 in the second liquid cooling zone 32.

[0060] According to one embodiment of the present invention, a plate groove 121 is provided on the box plate 12, a heat-conducting plate 40 is inserted and seals the plate groove 121, and one end of the heat-conducting plate 40 extends into the liquid cooling space 30.

[0061] The groove 121 allows one end of the heat-conducting plate 40 to extend into the liquid cooling space 30, forming a continuous heat conduction path and ensuring efficient heat transfer.

[0062] Please refer to the above as well. Figure 4 As shown, Figure 4 This is an overall structural diagram of the battery pack with part of the casing 11 removed, provided in this embodiment of the utility model.

[0063] To address the technical problem of uneven cooling in existing liquid-cooled battery packs, this utility model provides another solution: a battery pack comprising a battery box and battery cells 80 as provided in any of the above-mentioned embodiments, wherein the battery cells 80 are disposed within the accommodating space 20.

[0064] Because the battery pack of this embodiment includes the battery box provided by any of the above-mentioned claims, the battery pack of this embodiment also possesses the technical effects of the aforementioned battery box. This battery pack further improves heat dissipation efficiency by optimizing the layout and heat conduction path of the liquid cooling system, ensuring that the battery cell 80 maintains a stable temperature under different operating conditions, effectively extending battery life, and enhancing the overall system's safety and reliability.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined with each other to form new technical solutions.

[0069] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0070] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the design concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery box, characterized in that, include: The enclosure includes a shell and a panel disposed within the shell. The shell forms an accommodating space and a liquid cooling space. The panel separates the accommodating space from the liquid cooling space. The accommodating space is used to house the battery cells, and the liquid cooling space is used to contain the cooling medium. A heat-conducting plate is connected to the box plate and is inserted into the accommodating space to fit the battery cell.

2. The battery box according to claim 1, characterized in that, The battery box also includes multiple phase change guide plates. Each phase change guide plate includes a guide plate sleeve and a phase change unit encapsulated within the guide plate sleeve. The guide plate sleeve is disposed on the side of the box plate away from the liquid cooling space. Adjacent guide plate sleeves clamp the heat-conducting plate. The guide plate sleeve is used to attach the battery cell.

3. The battery box according to claim 2, characterized in that, The guide sleeve includes a first phase change plate, which is attached to the heat-conducting plate.

4. The battery box according to claim 3, characterized in that, The guide sleeve also includes a second phase change plate, which is attached to the box plate, and the first phase change plate and the second phase change plate are connected through a flow channel, which allows bidirectional flow of the phase change unit.

5. The battery box according to claim 2, characterized in that, The accommodating space is located above the liquid cooling space in the direction of gravity; Alternatively, the accommodating space is located below the liquid-cooled space in the direction of gravity.

6. The battery box according to claim 2, characterized in that, The battery box also includes a heat-conducting wire, one end of which is inserted into the guide plate sleeve, and the other end passes through the box plate to the liquid cooling space.

7. The battery box according to any one of claims 1-6, characterized in that, The liquid cooling space includes a first liquid cooling zone and a second liquid cooling zone that are interconnected. The first liquid cooling zone is located at the bottom or top of the housing, and the second liquid cooling zone surrounds the accommodating space.

8. The battery box according to claim 7, characterized in that, The housing has a liquid inlet and a liquid outlet. The liquid inlet is connected to the first liquid cooling zone, and the liquid outlet is connected to the second liquid cooling zone.

9. The battery box according to any one of claims 1-6, characterized in that, The box plate has a slot, the heat-conducting plate is inserted into and seals the slot, and one end of the heat-conducting plate extends into the liquid cooling space.

10. A battery pack, characterized in that, include: The battery box according to any one of claims 1-9; The battery cell is disposed within the accommodating space.

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