Battery box and battery pack

Abstract

The battery box comprises a box body and a heat conducting plate, the box body comprises a box shell and a box plate arranged in the box shell, an accommodating space and a liquid cooling space are formed in the box shell, the accommodating space and the liquid cooling space are separated by the box plate, the accommodating space is used for accommodating a battery cell, and the liquid cooling space is used for accommodating a cooling medium; the heat conducting plate is connected with the box plate, and the heat conducting plate is inserted into the accommodating space and used for being attached to the battery cell. Compared with the high temperature of the reactor core caused by low thermal conductivity of the battery core in the prior art, the multi-directional heat dissipation channel is formed through the three-dimensional layout of the heat conduction plates, the temperature distribution is balanced, the local thermal stress damage is avoided, the thermal management reliability of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly to a battery box and a battery pack. Background Art

[0002] With the increasing daily demand for clean energy, batteries have been widely used in various fields. A large amount of heat is generated during the operation of the battery cells, which will cause the temperature of the battery cells to rise. Especially when the battery cells are densely stacked inside the battery pack, the heat accumulation is more significant.

[0003] To solve the above problems and optimize the heat dissipation effect of the battery pack, there is a liquid cooling heat dissipation solution in the related art. For example, liquid cooling pipelines or liquid cooling plates are arranged at the bottom of the battery box, and the heat generated by the battery cells is absorbed and exported through the flowing cooling medium. Such a solution utilizes the high heat capacity characteristic of the cooling medium, can quickly reduce the temperature of the bottom of the battery cells in direct contact with the liquid cooling area, thereby delaying the risk of thermal runaway by establishing a basic heat conduction path and maintaining the relative stability of the operation of the battery system at the same time.

[0004] However, the traditional liquid cooling solution is limited by the low thermal conductivity of the battery cell material itself, and it is difficult for heat to be efficiently conducted from the inside of the battery cell to the bottom liquid cooling area. This results in a lower temperature at the bottom of the battery cell near the liquid cooling pipeline, while there are still high-temperature areas inside the stack core, forming a significant temperature gradient. This non-uniform heat distribution not only causes local material expansion differences but also leads to disorder of the lithium ion migration path. Under long-term operation, the continuous thermo-mechanical stress may accelerate the stripping of the electrode active material, resulting in an enlarged difference in the aging rate of the battery cells and ultimately causing imbalance in the overall performance of the battery pack, seriously restricting the reliability and safety of the high energy density battery system. Summary of the Invention

[0005] An object of the present invention is to provide a battery box and a battery pack, aiming to solve the technical problem in the prior art that the liquid cooling effect is limited to the bottom of the battery cells, while there is still a relatively high temperature inside the stack core.

[0006] To achieve the above object, a solution provided by the present invention is: a battery box, which includes a box body and a heat conducting plate: the box body includes a box shell and a box plate arranged inside the box shell. A accommodation space and a liquid cooling space are formed inside the box shell. The box plate separates the accommodation space from the liquid cooling space. The accommodation space is used for arranging battery cells, and the liquid cooling space is used for accommodating a cooling medium; the heat conducting plate is connected to the box plate, and the heat conducting plate is inserted into the accommodation space for fitting with the battery cells.

[0007] According to an embodiment of the present invention, the battery box further includes a plurality of phase change guide sheets. The phase change guide sheet includes a guide sheet sleeve and a phase change unit encapsulated in the guide sheet sleeve. The guide sheet sleeve is arranged on the side of the box plate away from the liquid cooling space, and adjacent guide sheet sleeves clamp the heat conducting plate. The guide sheet sleeve is used for fitting with the battery cells.

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

[0009] According to an embodiment of the present invention, the guide sheet sleeve further includes a second phase change sheet, the second phase change sheet is attached to the box board, and the first phase change sheet and the second phase change sheet are communicated through a diversion channel, and the diversion channel allows the two-way flow of the phase change unit.

[0010] According to an embodiment of the present invention, the accommodation space is located above the liquid cooling space in the direction of gravity; alternatively, the accommodation space is located below the liquid cooling space in the direction of gravity.

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

[0012] According to an embodiment of the present invention, the liquid cooling space includes a first liquid cooling area and a second liquid cooling area that communicate with each other, the first liquid cooling area is located at the bottom or top of the box body, and the second liquid cooling area surrounds the accommodation space.

[0013] According to an embodiment of the present invention, a liquid inlet and a liquid outlet are formed on the box shell, the liquid inlet is communicated with the first liquid cooling area, and the liquid outlet is communicated with the second liquid cooling area.

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

[0015] To achieve the above object, another solution provided by the present invention is: a battery pack, which includes the battery box provided in any one of the above and an electric core, and the electric core is arranged in the accommodation space.

[0016] The present invention 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 board arranged inside the box shell, a accommodation space and a liquid cooling space are formed inside the box shell, the box board separates the accommodation space and the liquid cooling space, the accommodation space is used for arranging the electric core, and the liquid cooling space is used for accommodating a cooling medium; the heat conducting plate is connected to the box board, and the heat conducting plate is inserted into the accommodation space.

[0018] One end of the heat conducting plate is inserted between the electric cores, and the other end contacts the box board or the liquid cooling medium, constructing an efficient heat transfer path. Utilize the high heat conductivity of the heat conducting plate to quickly transfer the heat of the core to the cooling medium, break through the limitation of relying on the heat conductivity of the electric core itself in the traditional way, and significantly improve the heat dissipation efficiency. Compared with the situation in the prior art where the high temperature inside the core is caused by the low heat conductivity of the electric core, the present invention forms a multi-directional heat dissipation channel through the three-dimensional layout of the heat conducting plate, balances the temperature distribution, avoids local thermal stress damage, and improves the thermal management reliability and service life of the battery pack. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0020] Figure 1 is a schematic cross-sectional view of the battery box provided by the embodiment of the present invention;

[0021] Figure 2 is Figure 1 a partial enlarged view of area A in

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

[0023] Figure 4 is an overall structure diagram of the battery pack with part of the box shell removed provided by the embodiment of the present invention.

[0024] Explanation of the reference numerals in the drawings:

[0025] 10, box body; 11, box shell; 111, liquid inlet; 112, liquid outlet; 12, box board; 121, board groove; 20, accommodation space; 30, liquid cooling space; 31, first liquid cooling area; 32, second liquid cooling area; 40, heat conducting plate; 51, guide piece sleeve; 52, phase change unit; 53, first phase change piece; 54, second phase change piece; 55, diversion channel; 60, heat conducting wire; 70, liquid cooling medium; 80, battery cell. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0027] With the increasing demand for clean energy, the application of batteries is becoming increasingly widespread. If the heat generated by the battery cells during operation cannot be dissipated in time, it will lead to an increase in temperature and pose a safety hazard. Especially when densely stacked, the limited heat dissipation space exacerbates the difficulty of thermal management. There are mainly two liquid cooling heat dissipation solutions in the related art. One is immersion liquid cooling, that is, the entire core stack is immersed in the cooling medium to achieve wrapped cooling; the other is non-immersion liquid cooling, for example, liquid cooling pipelines or liquid cooling plates are arranged at the bottom of the battery box, and the heat generated by the battery cells is absorbed and conducted out by the flowing cooling medium.

[0028] In the immersion liquid cooling solution, the battery cells are directly immersed in the cooling cavity, allowing the cooling medium to come into direct and comprehensive contact with the battery cells. Although it can achieve a good heat dissipation effect, considering factors such as the airtightness of the battery cells, the immersion liquid cooling system has disadvantages such as difficult maintenance and high operating costs. The non-immersion liquid cooling solution sets up cooling pipelines inside the battery box, making part of the surface of the battery cells fit with the cooling pipelines, and uses the cooling medium flowing in the pipelines to carry out the heat. However, traditional liquid cooling is limited by the low thermal conductivity of the battery cells, and it is difficult for heat to be efficiently conducted to the surface where the cooling pipelines are attached, resulting in a significant gradient of local low temperature and high temperature in the remaining areas. This uneven heat distribution causes differences in material expansion and disorders in lithium-ion migration. Long-term operation accelerates the stripping of electrode materials, leading to an imbalance in the overall performance of the battery pack.

[0029] Please refer to Figure 1 and Figure 2 as shown in Figure 1 is a schematic cross-sectional view of the battery box provided by an embodiment of the present invention, Figure 2 and Figure 1 is a partial enlarged view of area A in

[0030] To solve the above technical problems, a solution provided by the present invention is: a battery box, which includes a box body 10 and a heat conduction plate 40: the box body 10 includes a box shell 11 and a box plate 12 arranged inside the box shell 11. A accommodation space 20 and a liquid cooling space 30 are formed inside the box shell 11. The box plate 12 separates the accommodation space 20 from the liquid cooling space 30. The accommodation space 20 is used to arrange the battery cells 80, and the liquid cooling space 30 is used to accommodate the cooling medium; the heat conduction plate 40 is connected to the box plate 12, and the heat conduction plate 40 is inserted into the accommodation space 20 for fitting with the battery cells 80.

[0031] In the embodiment of the present invention, by introducing the heat conduction plate 40 connected to the box plate 12, when the battery pack is working, one end of the heat conduction plate 40 is inserted between the battery cells 80, and the other end extends to abut against the box plate 12 in direct contact with the liquid cooling medium 70, or even directly inserted into the liquid cooling space 30, constructing an efficient heat conduction path from the inside of the core to the liquid cooling medium 70. The heat conduction plate 40 is embedded in the gap between the battery cells 80, can efficiently absorb the heat in the core area, and quickly transfer the heat to the cooling medium in the liquid cooling space 30 by virtue of its higher thermal conductivity than that of the battery cells 80.

[0032] Compared with the immersion liquid cooling solutions in the related art, in this embodiment, the battery cells are separated from the coolant by the box plate, thus avoiding the risks brought about by the direct contact between the coolant and the battery cells in the immersion liquid cooling method and reducing the requirements for the airtightness of the battery cells. In addition, the non-immersion solution makes the installation, replacement, and maintenance of the battery cells more convenient. The battery cells can be directly taken out or put into the accommodation space without draining the cooling medium, eliminating the complex operations in the maintenance process of the immersion liquid cooling system, reducing the maintenance cost and maintenance cycle, and improving the maintainability and economy of the battery system.

[0033] Compared with the non-immersion liquid cooling solutions in the related art, although the battery cells in this embodiment are not immersed in the coolant, the heat conduction plate 40 intervenes in the internal thermal field of the core stack, balancing the temperature distribution inside and outside the battery cells 80. Compared with the traditional non-immersion cooling that only cools from some surfaces of the core stack, the technical solution of this application has more heat dissipation channels, achieving an excellent cooling effect similar to immersion without immersing the battery cells, avoiding the problem of "low temperature at the bottom and high temperature in the core stack" caused by the low thermal conductivity of the battery cells 80 themselves, reducing the mechanical stress damage to the structure of the battery cells 80 caused by local overheating or overcooling, and improving the thermal management reliability and service life of the battery pack.

[0034] It should be understood that the heat conduction plate 40 in this embodiment is attached to the battery cell 80, and the surfaces of the two that are close to each other are in an approximately parallel state to increase the heat dissipation efficiency of the heat conduction plate 40 for the battery cell 80. Specifically, it can be directly attached or some layer structures can be interposed.

[0035] The preferred ratio of the battery cell 80 to the heat conduction plate 40 is 2:1, that is, one layer of heat conduction plate 40 is interposed between every two battery cells 80, or there is a heat conduction plate 40 between any two adjacent battery cells 80, so as to achieve a higher density of the heat conduction plate 40 and a higher heat dissipation efficiency.

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

[0037] In the embodiment of the present invention, by adding a phase change guide sheet, the phase change unit 52 encapsulated in the guide sheet sleeve 51 undergoes solid-liquid phase change when the battery cell 80 generates heat. The liquid phase change material flows towards the low-temperature region along the temperature gradient, releases latent heat near the heat conduction plate 40, and then solidifies and flows back, forming a cyclic dynamic heat transfer process. This mechanism based on the active migration of the phase change medium not only utilizes the high latent heat characteristic of the phase change material to quickly absorb the heat of the core, but also enhances the directional transfer of heat to the heat conduction plate 40 and the liquid cooling space 30 through flow, breaking through the rate limitation of traditional static heat conduction and greatly improving the local heat diffusion efficiency. At the same time, the reciprocating motion of the phase change unit 52 continuously balances the temperature difference between the battery cell 80 and the cooling region, effectively avoiding the accumulation of heat in the core and further alleviating the material degradation problem caused by uneven temperature distribution.

[0038] Exemplarily, the phase change unit 52 contains a composite of an alkyl phase change material and nano boron nitride, and its phase change temperature range is 45 - 55 °C. During the endothermic process, it absorbs the heat on 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 sheet 54 melts into a liquid state, flows through the diversion channel 55 to the first phase change sheet 53, solidifies again after contacting the low-temperature heat conduction plate 40, and releases latent heat, forming an active heat regulation mechanism based on the cycle 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, which can be achieved by adjusting the flow channels in the liquid cooling space 30, adjusting the flow rate of the liquid cooling medium 70, controlling the input temperature of the liquid cooling medium 70, etc., to ensure that the phase change material is in the best working state, thereby achieving efficient heat transfer and temperature control.

[0039] It should be noted that the above technical principle analysis is only for the commonly used phase change unit 52 with solid-liquid two-phase conversion. In fact, the phase change unit 52 used in the phase change guide sheet of this embodiment can also be a material with 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 heat management requirements to achieve the best heat transfer effect.

[0040] In addition, according to the existing application examples of the phase change material, the design of the phase change guide sheet should also consider its long-term stability. For example, a high heat-resistant material is used as the guide sheet sleeve 51 for encapsulation to ensure no leakage in a high-temperature environment. Exemplarily, a microporous structure can be additionally provided on the outer side of the guide sheet sleeve 51 to utilize the possible convective heat transfer in the box 10 to further improve the heat conduction efficiency between the battery cell 80 and the phase change guide sheet. The synergistic effect of the phase change guide sheet and the liquid cooling system forms a multi-level thermal protection mechanism, significantly reducing the risk of thermal runaway of the battery cell 80. Its structure is compact and the installation is convenient, which is applicable to various battery modules, improving the reliability and safety of the system. This is a common technique for those skilled in the art and will not be elaborated in this application.

[0041] According to an embodiment of the present invention, the guide sheet sleeve 51 includes a first phase change sheet 53, and the first phase change sheet 53 is attached to the heat conducting plate 40.

[0042] In this embodiment, the first phase change sheet 53 is attached to the heat conducting plate 40. When the battery cell 80 generates heat, the phase change unit 52 encapsulated in the first phase change sheet 53 undergoes gasification phase change. The gaseous phase change material releases latent heat near the heat conducting plate 40 and then re-liquefies and flows back, forming a cyclic dynamic heat transfer process. This mechanism based on the active migration of the phase change unit 52 not only utilizes the high latent heat characteristic of the phase change material to quickly absorb the heat of the core, but also enhances the directional transfer of heat to the heat conducting plate 40 and the liquid cooling space 30 through flow, breaking through the rate limitation of traditional static heat conduction and greatly improving the heat diffusion efficiency from the battery cell 80 to the heat conducting plate 40. At the same time, the first phase change sheet 53 is clamped between the heat conducting plate 40 and the battery cell 80, and the reciprocating movement of the phase change unit 52 continuously balances the temperature difference between the battery cell 80 and the cooling area, effectively avoiding the accumulation of heat in the core and further alleviating the material deterioration problem caused by uneven temperature distribution.

[0043] Furthermore, the guide sheet sleeve 51 further includes a second phase change sheet 54. The second phase change sheet 54 is attached to the box plate 12, and the first phase change sheet 53 is communicated with the second phase change sheet 54 through a diversion channel 55, and the diversion channel 55 allows the two-way flow of the phase change unit 52.

[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 guide sheet is attached to the box plate 12, which can construct an efficient heat transfer path between the battery cell 80 and the liquid cooling system. Specifically, the phase change guide sheet directly contacts the surface of the box plate 12, and through the reciprocating flow generated by the phase change unit 52 inside 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 towards the heat conducting plate 40 and the box plate 12 under the drive of the temperature gradient, releases latent heat and then flows back to the side of the battery cell 80, 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 transport efficiency of heat to the liquid cooling medium 70, thereby enhancing the heat dissipation ability of the battery cell 80.

[0045] In addition, the setting of the diversion channel 55 enables the two-way flow of the phase change unit 52 between the first phase change sheet 53 and the second phase change sheet 54, adding a new heat conduction path, enhancing the uniform distribution of heat, effectively preventing local overheating phenomenon, and further improving the overall thermal management efficiency of the system.

[0046] Further, considering the influence of the volume expansion of the phase change unit 52 after gasification on the flow direction of the phase change unit 52, the diversion channel 55 adopts a gradient microchannel design, and its cross-section gradually increases from the second phase change sheet 54 to the first phase change sheet 53. The capillary action is utilized to accelerate the directional flow of the phase change unit 52 from the second phase change sheet 54 to the first phase change sheet 53, further enhancing the reflux efficiency of the phase change medium in the cooling state, and realizing pump-free self-circulation heat dissipation.

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

[0048] In this embodiment, the accommodation space 20 is located above the liquid cooling space 30 in the gravity direction, that is, the opening of the guide sheet sleeve 51 faces upward, which is the same as the opening direction of the usual box body 10. When the battery cell 80 is installed in the box body 10, the cooperation with the guide sheet sleeve 51 is realized, which facilitates the assembly and replacement of the battery cell 80.

[0049] Please refer to Figure 3 as shown Figure 3 which is a schematic cross-sectional view of a battery box provided by another embodiment of the present invention.

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

[0051] In this embodiment, the accommodation space 20 is placed below the liquid cooling space 30, making full use of the guiding effect of gravity on the flow of the phase change medium to form a self-driven circulating heat transfer system. When the battery cell 80 generates heat, the phase change unit 52 absorbs heat and gasifies to form steam, which spontaneously diffuses upward to the liquid cooling space 30 region due to the reduced density, and quickly condenses and liquefies after contacting the low-temperature liquid cooling medium 70, and drips and refluxes to the accommodation space 20 under the action of gravity. This dynamic cycle based on the synergistic action 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 board 12, enabling heat to be efficiently transported to the liquid cooling 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 supply mechanism of the dripping and refluxing of the liquid medium, not only breaks through the rate bottleneck of the traditional heat conduction path, but also can continuously balance the temperature gradient between the battery cell 80 and the cooling interface through the circulating flow, further reducing the thermal resistance and suppressing local temperature rise, and realizing the synchronous improvement of the heat dissipation efficiency and the system heat balance ability.

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

[0053] In this embodiment, the heat-conducting wire 60 penetrates through the box board 12 to establish a multi-stage composite heat conduction path between the phase change guide piece and the liquid cooling medium 70. The heat-conducting wire 60 is inserted into the guide piece sleeve 51 and directly contacts the phase change unit 52. By utilizing the high heat conduction characteristics 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 realizes the instant and rapid release of heat through the solid heat-conducting wire 60, effectively improving the transient heat dissipation response speed under extreme working conditions, and at the same time enhancing the temperature balance ability between the battery cell 80 and the cooling medium, and avoiding local heat accumulation caused by the phase change cycle delay.

[0054] Exemplarily, the heat-conducting wire 60 is made of a graphene composite copper-based material, its diameter is adjustable within the range of 0.5-2 mm, and its distribution density in the guide piece sleeve 51 is 5-8 wires / cm 2 . The surface of the heat-conducting wire 60 is treated by anodic oxidation to form a porous structure, which improves the interfacial heat transfer coefficient by increasing the contact area with the phase change material. At the same time, the part of the heat-conducting wire 60 extending into the liquid cooling space 30 adopts a spiral winding structure, so that the cooling medium generates turbulence to enhance the convective heat transfer.

[0055] According to an embodiment of the present invention, the liquid cooling space 30 includes a first liquid cooling area 31 and a second liquid cooling area 32 that are interconnected. The first liquid cooling area 31 is located at the bottom or top of the box body 10, and the second liquid cooling area 32 surrounds the accommodating space 20.

[0056] In this embodiment, by dividing the liquid cooling space 30 into the first liquid cooling area 31 and the second liquid cooling area 32 surrounding the accommodating space 20, a three-dimensional heat dissipation layout in which the bottom and side surfaces of the core stack cooperate with each other is formed: the first liquid cooling area 31 conducts centralized heat dissipation for the high heat density area of the battery module, and cooperates with the heat-conducting plate 40 to quickly export the main heat flow of the core stack; the second liquid cooling area 32 eliminates the heat dissipation blind area through the surrounding layout, synchronously absorbs the lateral heat diffusion of the battery cell 80 and the environmental heat, and improves the adaptability of the system to the non-uniform heat generation working condition by the flow of the cooling medium between the first liquid cooling area 31 and the second liquid cooling area 32, effectively ensuring the thermal safety and stability of the high energy density battery.

[0057] It should be noted that although in most cases, the battery pack is used in a fixed direction, that is, the gravity direction points from the top of the box body 10 to the bottom, in some special cases, the top and bottom of this embodiment should be understood as the two ends of the box body 10 in the battery cell 80 loading direction, rather than the physical positions in the absolute sense. Under special working conditions, such as the side-entry 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, ensure the stable temperature of the battery cell 80, prevent the risk of thermal runaway, and improve the heat dissipation reliability of the system in various postures.

[0058] Further, a liquid inlet 111 and a liquid outlet 112 are formed on the box shell 11. The liquid inlet 111 is communicated with the first liquid cooling area 31, and the liquid outlet 112 is communicated with the second liquid cooling area 32.

[0059] In this embodiment, the liquid inlet 111 is communicated with the first liquid cooling area 31, and the liquid outlet 112 is communicated with the second liquid cooling area 32. This enables the cooling medium in the relatively narrow second liquid cooling area 32 to be discharged by overflow, with a relatively slow flow rate, avoiding the cooling medium 70 directly flushing into the second liquid cooling area 32 and causing a dead zone where the cooling medium 70 stagnates in the area of the second liquid cooling area 32 far from the liquid inlet 111.

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

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

[0062] Please refer to Figure 4 shown Figure 4 is the overall structure diagram of the battery pack with part of the box shell 11 removed provided by the embodiment of the present invention.

[0063] To solve the technical problem of uneven cooling of the existing liquid-cooled battery pack, another solution provided by the present invention is: a battery pack, which includes the battery box provided in any one of the above and the battery cells 80, and the battery cells 80 are arranged in the accommodation space 20.

[0064] Since the battery pack of this embodiment includes the battery box provided in any one of the above, therefore, the battery pack of this embodiment also has the technical effects of the above battery box. This battery pack further improves the heat dissipation efficiency by optimizing the layout of the liquid cooling system and the heat conduction path, ensures that the battery cells 80 can maintain a stable temperature under different working conditions, effectively extends the battery service life, and enhances the safety and reliability of the overall system.

[0065] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indication also changes accordingly.

[0066] It should also be noted that when an element is referred to as "fixed to" or "arranged on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or can also be indirectly connected to the other element through an intermediate element.

[0067] In addition, the descriptions involving "first", "second", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0068] If there is no special instruction, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0069] If there is no special instruction, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0070] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the design concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that, Comprising: A battery box, including a box shell and box plates disposed within the box shell. An accommodation space and a liquid cooling space are formed within the box shell. The box plates separate the accommodation space from the liquid cooling space. The accommodation space is for arranging battery cells, and the liquid cooling space is for accommodating a cooling medium. A heat conducting plate, connected to the box plates, inserted into the accommodation space, and used for attaching to the battery cells.

2. The battery box according to claim 1, characterized in that, The battery box further includes a plurality of phase change guide sheets. The phase change guide sheets include guide sheet sleeves and phase change units encapsulated within the guide sheet sleeves. The guide sheet sleeves are disposed on a side of the box plates away from the liquid cooling space. Adjacent guide sheet sleeves clamp the heat conducting plate, and the guide sheet sleeves are for attaching to the battery cells.

3. The battery box according to claim 2, wherein The guide sheet sleeve includes a first phase change sheet disposed in attachment to the heat conducting plate.

4. The battery box according to claim 3, characterized in that, The guide sheet sleeve further includes a second phase change sheet disposed in attachment to the box plates, and the first phase change sheet and the second phase change sheet are connected through a diversion channel that allows two-way flow of the phase change unit.

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

6. The battery box according to claim 2, wherein The battery box further includes a heat conducting wire. One end of the heat conducting wire is inserted into the guide sheet sleeve, and the other end passes through the box plates into 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 area and a second liquid cooling area that communicate with each other. The first liquid cooling area is located at the bottom or top of the battery box, and the second liquid cooling area surrounds the accommodation space.

8. The battery box according to claim 7, wherein Liquid inlets and outlets are formed on the box shell. The liquid inlets communicate with the first liquid cooling area, and the liquid outlets communicate with the second liquid cooling area.

9. The battery box according to any one of claims 1-6, characterized in that, Plate grooves are formed on the box plates. The heat conducting plate is inserted into and blocks the plate grooves, and one end of the heat conducting plate extends into the liquid cooling space.

10. A battery pack, characterized in that, Comprising: The battery box according to any one of claims 1-9; Battery cells, disposed within the accommodation space.

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