Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, and relates to the technical field of battery devices, and the battery device comprises a first battery core assembly, a second battery core assembly, a first heat management part and a second heat management part. And the first battery cell assembly and the second battery cell assembly are distributed in a laminated manner. The first heat management part is in heat conduction connection with the first battery cell assembly and is provided with a first interface, a first channel and a second channel, a heat exchange medium flows into the first channel and the second channel through the first interface, and the length of the first channel covered by the first battery cell assembly is larger than that of the second channel covered by the first battery cell assembly. The second heat management part is in heat conduction connection with the second battery cell assembly and is provided with a third channel, and the third channel is communicated with the second channel. The heat exchange medium is shunted by the first channel and the second channel, and the heat exchange medium in the second channel flows to the second heat management part at a relatively low temperature, so that the temperature difference between the first battery core assembly and the second battery core assembly is reduced, and the safety of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery device technical field, specifically, relate to a battery device and electric device. BACKGROUND

[0002] At present, a part of battery pack is provided with double-layer arranged battery cells to meet the requirement of vehicle to battery pack electric quantity. In the process of heat dissipation of double-layer battery cells, the heat exchange medium first flows through the lower water cooling plate to heat the first layer of battery cells, and then the heat exchange medium flows to the upper water cooling plate to heat the second layer of battery cells.

[0003] After the heat exchange medium flows out of the first layer of water cooling plate, the temperature of the heat exchange medium is already high, which cannot effectively meet the heat dissipation requirement of the second layer of battery cells, thereby affecting the reliability and safety of the whole vehicle. SUMMARY

[0004] The utility model aims at solving the problem that the double-layer battery cells cannot be effectively cooled in the prior art or related technology, which affects the reliability and safety of the whole vehicle.

[0005] In a first aspect, the application provides a battery device, which comprises a first battery cell assembly, a second battery cell assembly, a first heat management member and a second heat management member. The first battery cell assembly and the second battery cell assembly are distributed in layers. The first heat management member is arranged on one side of the first battery cell assembly and is in thermal connection with the first battery cell assembly. The first heat management member is provided with a first interface, a first channel and a second channel. The heat exchange medium flows into the first channel and the second channel through the first interface. The length of the first channel covered by the first battery cell assembly is greater than the length of the second channel covered by the first battery cell assembly. The second heat management member is arranged on one side of the second battery cell assembly and is in thermal connection with the second battery cell assembly. The second heat management member is provided with a third channel. The third channel is in communication with the second channel, and the third channel is used for passing the heat exchange medium.

[0006] The first heat management member is provided with the first channel and the second channel. The heat exchange medium can be introduced into the first channel and the second channel. The heat exchange medium in the first channel is used for heat dissipation of the first battery cell assembly. The second heat management member is provided with the third channel. The heat exchange medium in the second channel flows to the third channel, so that the heat exchange medium in the third channel is used for heat dissipation of the second battery cell assembly.

[0007] In the embodiment, the heat exchange medium in the first channel is mainly used to dissipate heat of the first battery assembly, the heat exchange medium in the first channel cannot flow to the third channel, and only the heat exchange medium in the second channel flows to the third channel. Since the heat exchange medium in the first channel can absorb heat of the first battery assembly, even if the heat exchange medium in the second channel is affected by heat of the first battery assembly, the heat exchange medium in the second channel only absorbs part of the heat of the first battery assembly, and therefore the heat exchange medium flowing into the third channel only absorbs part of the heat of the first battery assembly. Compared with the manner in which the cooling medium in the related art absorbs most of the heat of the first battery assembly and then dissipates heat of the second battery assembly, the heat exchange medium flowing into the third channel still has a relatively low temperature in the embodiment, so that the second heat management member can effectively dissipate heat of the second battery assembly, and the operation stability of the second battery assembly is improved.

[0008] Since the length of the second channel covered by the first battery assembly is smaller than that of the first channel, the second channel absorbs less heat of the first battery assembly than the first channel, so that the temperature rising speed of the heat exchange medium in the second channel can be reduced.

[0009] In the embodiment, the first heat management member is provided with the first channel and the second channel to divide the heat exchange medium, the heat exchange medium in the second channel can flow to the second heat management member at a relatively low temperature, the heat dissipation efficiency of the second battery assembly is improved, the temperature difference between the first and second battery assemblies is reduced, the difference in battery degradation is reduced, and the reliability and safety of the battery device are improved. In the case where the battery device is installed in the power consumption device, the reliability and safety of the power consumption device can also be improved.

[0010] In a possible embodiment, the first battery assembly covers at least part of the first channel, and the second channel is distributed in a staggered manner with the first battery assembly.

[0011] In the case where the first battery assembly covers at least part of the first channel, the first battery assembly directly faces at least part of the first channel, and this arrangement can improve the heat exchange speed between the heat exchange medium in the first channel and the first battery assembly.

[0012] In the case where the second channel is distributed in a staggered manner with the first battery assembly, the second channel is as far away from the first battery assembly as possible, so that the heat exchange speed between the cooling liquid in the second channel and the first battery assembly is reduced. The heat exchange medium in the second channel can flow to the third channel at a relatively low temperature, and the heat dissipation effect of the heat exchange medium in the third channel on the second battery assembly is improved.

[0013] In a possible embodiment, the first battery assembly covers at least part of the first channel, and the first battery assembly covers at least part of the second channel.

[0014] The heat exchange medium flowing in the second channel for a short length can enter the third channel. By shortening the flow time of the heat exchange medium in the second channel, the heat exchange time of the heat exchange medium in the second channel and the first cell assembly can be reduced. The heat exchange medium flowing to the third channel still has a low temperature, and the heat dissipation effect of the heat exchange medium in the third channel on the second cell assembly can be improved.

[0015] In a possible embodiment, the first thermal management member and the second thermal management member are distributed in layers, and the battery device further comprises a first communication pipe, the second channel and the third channel being communicated through the first communication pipe.

[0016] By arranging the first communication pipe between the first thermal management member and the second thermal management member, the connection difficulty of the first thermal management member and the second thermal management member can be simplified, and the processing and assembly efficiency can be improved.

[0017] In a possible embodiment, the first thermal management member is further provided with a second interface, the first interface being used for flowing in the heat exchange medium, and the second interface being used for flowing out the heat exchange medium. The first channel has a first end and a second end, and the first end and the second end are respectively communicated with the first interface and the second interface. The second channel comprises a first part and a second part, the first part being communicated with the third channel and the first interface, and the second part being communicated with the third channel and the second interface.

[0018] The heat exchange medium in the first thermal management member and the second thermal management member is discharged through the second interface. In this case, the interface for discharging the heat exchange medium does not need to be arranged on the second thermal management member, so that the structure of the second thermal management member can be simplified, and the processing difficulty of the second thermal management member can be reduced.

[0019] In a possible embodiment, the second part is distributed in a staggered manner with the first cell assembly, or the first cell assembly covers at least part of the second part.

[0020] In the case that the heat exchange medium flowing out of the third channel has a high temperature, the second part needs to be avoided from the first cell assembly to reduce the heat transferred from the heat exchange medium in the second part to the first cell assembly.

[0021] In the case that the heat exchange medium flowing out of the third channel has a low temperature, it means that the temperature of the heat exchange medium in the second thermal management member is not too high after the heat exchange with the second cell assembly. In this case, the first cell assembly covers at least part of the second part, and the heat exchange medium can be used to further dissipate heat for the first cell assembly.

[0022] In a possible embodiment, the battery device further comprises a flow channel connecting member connected with the first interface, the flow channel connecting member being used to control the flow through the first interface, or the flow channel connecting member being used to distribute the flow to the first channel and the second channel.

[0023] The embodiment provides the flow channel connector with adjustable flow rate at the first heat management member, and the flow channel connector can perform flow channel distribution and flow control according to actual requirements, so as to flexibly distribute the flow rate of the heat exchange medium.

[0024] In a possible embodiment, the first interface and the second interface are arranged on the same side of the first heat management member.

[0025] In the case that the first interface and the second interface are mounted on the same side of the first heat management member, the installation of the first interface and the second interface can be facilitated, and external pipeline structures can be conveniently mounted on the same side of the first heat management member.

[0026] In a possible embodiment, a part of the first heat management member is bent away from the first battery cell assembly to form a plurality of protruding parts on the side of the first heat management member away from the first battery cell assembly, and the first channel and the second channel are arranged at intervals from the protruding parts.

[0027] The protruding parts can strengthen the structural stability of the first heat management member, so that the first heat management member is not prone to deformation, and the first heat management member can stably adhere to the first battery cell assembly, so that the first battery cell assembly can be stably cooled.

[0028] In a possible embodiment, the protruding parts form a groove on the side facing the first battery cell assembly. The battery device further comprises a heat-conducting fin, the first channel and the groove are connected in heat conduction through the heat-conducting fin, and / or the second channel and the groove are connected in heat conduction through the heat-conducting fin.

[0029] The inside of the groove exchanges heat with the heat exchange medium in the first channel through the heat-conducting fin, so as to cool the inside of the groove, and the position corresponding to the groove in the first battery cell assembly can also be cooled, thereby facilitating the heat dissipation effect of the first battery cell assembly.

[0030] In a possible embodiment, the battery device further comprises a box body, the first battery cell assembly, the second battery cell assembly, the first heat management member and the second heat management member are located in the box body, the second heat management member is locked in the box body, the first battery cell assembly is adhesively fixed to the first heat management member, and the second heat management member is arranged at intervals from the first battery cell assembly.

[0031] The first cell assembly is fixed to the first thermal management member by structural glue, so that the position of the first cell assembly is fixed, and the first cell assembly is not prone to shift relative to the first thermal management member.

[0032] In a second aspect, the application provides a battery device.

[0033] The additional aspects and advantages of the present application will become apparent from the following description, or will be appreciated by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings, in which:

[0035] Figure 1 Fig. 1 shows a structural schematic view of a first thermal management member, a second thermal management member, a first interface, a second interface and a first communication pipe in an embodiment of the present application;

[0036] Figure 2 Fig. 2 shows a partial structural schematic view of a battery device in an embodiment of the present application;

[0037] Figure 3 Fig. 3 shows a structural schematic view of a first thermal management member and a heat-conducting fin in an embodiment of the present application; Figure 2 Fig. 4 shows an enlarged view of A in Fig. 3;

[0038] Figure 4 Fig. 5 shows a structural schematic view of a first thermal management member, a second thermal management member, a first interface, a second interface and a first communication pipe in another embodiment of the present application;

[0039] Figure 5 Fig. 6 shows a partial structural schematic view of a battery device in another embodiment of the present application;

[0040] Figure 6 Fig. 7 shows a structural schematic view of a first thermal management member and a heat-conducting fin in another embodiment of the present application;

[0041] Figure 7 Fig. 8 shows a structural schematic view of a battery device in another embodiment of the present application;

[0042] Figure 8 Fig. 9 shows a structural schematic view of an electric device in an embodiment of the present application.

[0043] Reference signs:

[0044] 10 use electric device, 100 battery device, 110 first battery cell assembly, 111 first sub battery cell, 112 second sub battery cell, 120 second battery cell assembly, 130 first thermal management piece, 131 first channel, 132 second channel, 1321 first part, 1322 second part, 133 first interface, 134 second interface, 136 convex part, 137 groove, 138 first end, 139 second end, 140 second thermal management piece, 141 third channel, 150 first communication pipe, 160 flow passage connecting piece, 170 heat conduction fin, 180 box body, 191 first end plate, 192 second end plate, 193 third end plate, 194 connecting piece, 200 vehicle body. DETAILED DESCRIPTION

[0045] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be described in further detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0046] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0047] At present, the bottom space of the vehicle is usually a module composed of multiple groups of battery cells arranged in sequence, however, with the continuous improvement of the requirements of new energy vehicles on battery energy density and endurance mileage, part of the oil-to-electric vehicle type cannot arrange enough battery cells through single-layer module arrangement due to the special-shaped and narrow position of the bottom space, and it is difficult to meet the demand of the whole vehicle on the battery pack power. Therefore, designing a double-layer battery cell module battery pack becomes an important direction to solve this problem. By arranging the upper and lower two layers of battery cells inside the battery pack, the arrangement area of the battery cells is increased, thereby improving the whole pack power and meeting the demand of the whole vehicle on the battery pack power.

[0048] For a battery pack of a double-layer battery cell module, a water cooling plate needs to be arranged for each layer of battery cells. The heat exchange medium needs to flow through the first layer of water cooling plates first to dissipate heat for the first layer of battery cells, and then flow to the second layer of water cooling plates to dissipate heat for the second layer of battery cells. When the second layer of battery cells has a large heat dissipation requirement, this heat dissipation method will cause the heat dissipation efficiency of the second layer of battery cells to decrease, and even the temperature difference between the first and second layers of battery cells to be too large. Due to the temperature difference, the battery cells will have a large difference in degradation during the process of use day after day, which will eventually affect the overall performance and service life of the battery pack. This design not only causes the heat dissipation performance of the battery pack to decrease, but also can cause safety hazards, such as an increased risk of thermal runaway, thereby threatening the reliability and safety of the vehicle.

[0049] Based on the above problem of uneven heat dissipation of the double-layer battery cells, in order to enable the double-layer battery cells to dissipate heat effectively, the battery device is provided, the flow channel of the first layer of thermal management members is designed in a targeted manner, and part of the flow channel is preset in the first layer of thermal management members, so that the heat exchange medium entering the battery pack can flow directly to the second layer of thermal management members to cool and dissipate heat for the second layer of battery cells. This design enables the heat exchange medium flowing to the second layer of battery cells to maintain a low temperature, which is beneficial to improving the heat dissipation efficiency of the second layer of battery cells and the reliability and safety of the battery device.

[0050] The battery device disclosed in the embodiments of the present application can be used in a power consumption device using the battery device as a power source. The power consumption device can be, but is not limited to, a vehicle, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc.

[0051] In the case where the power consumption device in the present application is a vehicle, as shown in Figure 8 , the vehicle includes a vehicle body 200 and a battery device 100, and the battery device 100 is arranged on the vehicle body 200. The vehicle can be a new energy vehicle, which is a pure electric vehicle, a hybrid electric vehicle, or a range extended vehicle, etc. The vehicle is internally provided with the battery device, which can be arranged at the bottom, head or tail of the vehicle. The battery device can be used for power supply of the vehicle, for example, the battery device can be used as an operating power source of the vehicle. The vehicle can further include a controller and a motor, and the controller is used to control the battery device to supply power to the motor, for example, to meet the power demand of the vehicle during starting, navigation and driving. The battery device can not only be used as an operating power source of the vehicle, but also be used as a driving power source of the vehicle, which replaces or partially replaces fuel or natural gas to provide driving power for the vehicle.

[0052] In combination with Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, according to the battery device 100 provided by some embodiments of the present application, the battery device 100 comprises a first battery cell assembly 110, a second battery cell assembly 120, a first thermal management member 130, and a second thermal management member 140. The first battery cell assembly 110 and the second battery cell assembly 120 are distributed in a stacked manner. The first thermal management member 130 is arranged on one side of the first battery cell assembly 110 and is in thermal connection with the first battery cell assembly 110. The first thermal management member 130 is provided with a first interface 133, a first channel 131, and a second channel 132. The heat exchange medium flows into the first channel 131 and the second channel 132 through the first interface 133. The length of the first channel 131 covered by the first battery cell assembly 110 is greater than the length of the second channel 132 covered by the first battery cell assembly 110. The second thermal management member 140 is arranged on one side of the second battery cell assembly 120 and is in thermal connection with the second battery cell assembly 120. The second thermal management member 140 is provided with a third channel 141. The third channel 141 is in communication with the second channel 132, and the third channel 141 is used to pass the heat exchange medium.

[0053] The first battery cell assembly 110 and the second battery cell assembly 120 are distributed in a stacked manner. For example, the first battery cell assembly 110 is arranged on the upper layer of the second battery cell assembly 120, or the first battery cell assembly 110 is arranged on the lower layer of the second battery cell assembly 120. According to the size and shape of the internal space of the power utilization device 10, the size of the first battery cell assembly 110 and the second battery cell assembly 120 can be designed accordingly. For example, when the internal space of the power utilization device 10 is large, the first battery cell assembly 110 and the second battery cell assembly 120 can be designed to have the same length and width. When the internal space of the power utilization device 10 is limited, for example, when the second battery cell assembly 120 is arranged on the upper layer of the first battery cell assembly 110, the length of the second battery cell assembly 120 can be designed to be smaller than the length of the first battery cell assembly 110, so as to reduce the occupied space of the second battery cell assembly 120.

[0054] The first thermal management member 130 is arranged on one side of the first battery cell assembly 110. The first thermal management member 130 can be attached to one side of the first battery cell assembly 110, or a small gap can be left between the first thermal management member 130 and the first battery cell assembly 110. When the heat exchange medium with a low temperature is introduced into the first thermal management member 130, the first thermal management member 130 can exchange heat with the first battery cell assembly 110, thereby achieving the function of dissipating heat of the first battery cell assembly 110. By reducing the temperature of the first battery cell assembly 110, the operating stability of the first battery cell assembly 110 can be improved.

[0055] The second thermal management member 140 is arranged on one side of the second battery cell assembly 120, and can be attached to one side of the second battery cell assembly 120, or a small gap is left between the second thermal management member 140 and the second battery cell assembly 120. When the second thermal management member 140 is filled with heat exchange medium with a lower temperature, the second thermal management member 140 can exchange heat with the second battery cell assembly 120, thereby achieving the function of dissipating heat of the second battery cell assembly 120, and by reducing the temperature of the second battery cell assembly 120, the operation stability of the second battery cell assembly 120 can be improved.

[0056] The first thermal management member 130 is provided with a first channel 131 and a second channel 132, and heat exchange medium can be filled into the first channel 131 and the second channel 132. The heat exchange medium in the first channel 131 is used to dissipate heat of the first battery cell assembly 110. The second thermal management member 140 is provided with a third channel 141, and the heat exchange medium in the second channel 132 flows to the third channel 141, so that the heat exchange medium in the third channel 141 is used to dissipate heat of the second battery cell assembly 120.

[0057] Since the length of the second channel 132 covered by the first battery cell assembly 110 is smaller than that of the first channel 131, the second channel 132 absorbs less heat of the first battery cell assembly 110 than the first channel 131, thereby reducing the temperature rise rate of the heat exchange medium in the second channel 132.

[0058] In this embodiment, after the heat exchange medium flows into the first channel 131 and the second channel 132 through the first interface 133, the heat exchange medium in the first channel 131 is mainly used to dissipate heat of the first battery cell assembly 110, and the heat exchange medium in the first channel 131 will not flow to the third channel 141, and only the heat exchange medium in the second channel 132 flows to the third channel 141. Since the heat exchange medium in the first channel 131 can absorb heat of the first battery cell assembly 110, even if the heat exchange medium in the second channel 132 is affected by the heat of the first battery cell assembly 110, the heat exchange medium in the second channel 132 only absorbs part of the heat of the first battery cell assembly 110, so the heat exchange medium flowing into the third channel 141 only absorbs part of the heat of the first battery cell assembly 110. Compared with the way in the related art that the cooling medium absorbs most of the heat of the first battery cell and then dissipates heat of the second battery cell, the heat exchange medium flowing into the third channel 141 still has a lower temperature in this embodiment, so that the second thermal management member 140 can effectively dissipate heat of the second battery cell assembly 120, which is conducive to improving the operation stability of the second battery cell assembly 120.

[0059] In this embodiment, the first thermal management component 130 is provided with a first channel 131 and a second channel 132 to divert the heat exchange medium. The heat exchange medium in the second channel 132 can flow to the second thermal management component 140 at a lower temperature, which is beneficial to improve the heat dissipation efficiency of the second cell assembly 120, reduce the temperature difference between the first and second layers of cells, thereby reducing the cell degradation difference and improving the reliability and safety of the battery device 100. When the battery device 100 is installed in the power-consuming device 10, the reliability and safety of the power-consuming device 10 can also be improved.

[0060] It should be noted that in this embodiment, the first channel 131 and the second channel 132 are provided in the first thermal management component 130. With this arrangement, only the liquid inlet structure needs to be provided in the first thermal management component 130. If the first thermal management component 130 and the second thermal management component 140 are provided with liquid inlet structures respectively, the structure of the battery device 100 will be too complicated. Therefore, the liquid inlet method in this embodiment can effectively simplify the structure of the battery device 100. With the trend of gradually decreasing usable space inside the power device 10, the battery device 100 in this embodiment can be more conveniently installed into the power device 10 by simplifying its structure, thereby improving the adaptability of the battery device 100.

[0061] For example, the heat exchange medium can be gas, water, oil, or solid heat exchange materials, etc.

[0062] Combination Figure 1 , Figure 2 and Figure 4 As shown, in one possible embodiment, the first cell assembly 110 covers at least a portion of the first channel 131, and the second channel 132 is offset from the first cell assembly 110.

[0063] When the first cell assembly 110 covers at least a portion of the first channel 131, the first cell assembly 110 is directly facing at least a portion of the first channel 131. This arrangement is beneficial to improving the heat exchange rate between the heat exchange medium in the first channel 131 and the first cell assembly 110.

[0064] The heat exchange medium within the first channel 131 is used to dissipate heat from the first battery cell assembly 110. To improve the heat exchange rate between the heat exchange medium within the first channel 131 and the first battery cell assembly 110, it is necessary to increase the area corresponding to the first battery cell assembly 110 and the first channel 131. In this embodiment, the first battery cell assembly 110 covers the first channel 131. For example, when the first thermal management component 130 is located at the bottom of the first battery cell assembly 110, the first battery cell assembly 110 can completely or partially cover the area on the first thermal management component 130 where the first channel 131 is located.

[0065] In a case where the position of the first passage 131 provided on the first thermal management member 130 is completely covered by the first cell assembly 110, the heat exchange medium at any position in the first passage 131 will pass through the bottom of the first cell assembly 110, so that the heat exchange medium in the first passage 131 can be efficiently heat-exchanged with the first cell assembly 110, which is beneficial to improve the heat exchange effect on the first cell assembly 110, and further improve the reliability and stability of the first cell assembly 110.

[0066] Similarly, the second cell assembly 120 needs to cover the third passage 141, so as to improve the heat dissipation effect of the heat exchange medium in the third passage 141 on the second cell assembly 120.

[0067] The heat exchange medium in the second passage 132 will flow to the third passage 141. In a case where the second passage 132 is distributed in a staggered manner with the first cell assembly 110, the second passage 132 is as far away from the first cell assembly 110 as possible, which reduces the heat exchange speed between the cooling liquid in the second passage 132 and the first cell assembly 110. In the embodiment, the second passage 132 is distributed in a staggered manner with the first cell assembly 110, for example, in a case where the first thermal management member 130 is arranged at the bottom of the first cell assembly 110, the first cell assembly 110 does not cover the second passage 132. The heat exchange medium in the second passage 132 will not pass through the bottom of the first cell assembly 110 during the flow process, so as to reduce the heat exchange between the heat exchange medium in the second passage 132 and the first cell assembly 110, so that the heat exchange medium in the second passage 132 can maintain a lower temperature and flow to the third passage 141, which is beneficial to improve the heat dissipation effect of the heat exchange medium in the third passage 141 on the second cell assembly 120.

[0068] In combination with FIGS. 1 to 3, Figure 4 and Figure 5 As shown in a possible embodiment, the first cell assembly 110 covers at least part of the first passage 131, and the first cell assembly 110 covers at least part of the second passage 132.

[0069] Taking an example that the first thermal management member 130 is arranged at the bottom of the first cell assembly 110, the first cell assembly 110 can completely cover or partially cover the position of the first passage 131 provided on the first thermal management member 130, so that the heat exchange medium in the first passage 131 can be efficiently heat-exchanged with the first cell assembly 110, which is beneficial to improve the heat exchange effect on the first cell assembly 110.

[0070] In order to improve the heat exchange effect of the heat exchange medium in the first channel 131 and the first battery cell assembly 110, the first channel 131 needs to be arranged in a multi-bend structure, for example, the first channel 131 is arranged in a serpentine shape, so that the curve length of the first channel 131 can be increased, the first channel 131 can pass through most of the area at the bottom of the first battery cell assembly 110, and uniform heat dissipation of the first battery cell assembly 110 can be achieved. In order to reduce the temperature rise speed of the heat exchange medium in the second channel 132, the second channel 132 can be arranged to have a small curve length, for example, the second channel 132 only extends to the position communicated with the third channel 141 through a small number of bends, and the smaller the curve length of the second channel 132, the smaller the influence of the first battery cell assembly 110 on the heat exchange medium in the second channel 132.

[0071] In the case of limited space in the battery device 100, the size of the first thermal management member 130 is also limited, so that the first thermal management member 130 does not protrude too much from the edge of the first battery cell assembly 110, so that the first thermal management member 130 can cover at least a part of the second channel 132. In the case that the curve length of the first channel 131 is greater than the curve length of the second channel 132, although the first battery cell assembly 110 covers at least a part of the second channel 132, the heat exchange medium in the second channel 132 can flow through the shorter curve length to enter the third channel 141, and the heat exchange medium flowing to the third channel 141 still has a lower temperature, which can improve the heat dissipation effect of the heat exchange medium in the third channel 141 on the second battery cell assembly 120.

[0072] In combination with FIGS. 1 to 3, Figure 1 and Figure 2 As shown in a possible embodiment, the first thermal management member 130 and the second thermal management member 140 are arranged in a stacked manner, and the battery device 100 further comprises a first communication pipe 150, and the second channel 132 and the third channel 141 are communicated through the first communication pipe 150.

[0073] The first battery cell assembly 110 and the second battery cell assembly 120 are arranged in a stacked manner, and the first thermal management member 130 and the second thermal management member 140 are also arranged in a stacked manner. In this embodiment, the first thermal management member 130 is arranged at the bottom of the first battery cell assembly 110, and the second thermal management member 140 is arranged at the bottom of the second battery cell assembly 120. Taking the first thermal management member 130 as the bottom layer, from bottom to top, the first thermal management member 130, the first battery cell assembly 110, the second thermal management member 140, and the second battery cell assembly 120 are arranged in sequence.

[0074] The first communication pipe 150 is arranged between the first thermal management member 130 and the second thermal management member 140, and the second passage 132 and the third passage 141 are communicated through the first communication pipe 150, and the heat exchange medium in the second passage 132 flows to the third passage 141 through the first communication pipe 150.

[0075] By arranging the first communication pipe 150 between the first thermal management member 130 and the second thermal management member 140, the connection difficulty of the first thermal management member 130 and the second thermal management member 140 is facilitated to be simplified, and the processing and assembling efficiency is improved.

[0076] In other embodiments, the first thermal management member 130 can also be arranged at the side of the first battery cell assembly 110, or the second thermal management member 140 can also be arranged at the side of the second battery cell assembly 120.

[0077] As shown in the possible embodiment, Figure 1 The first thermal management member 130 is further provided with a second interface 134 for flowing out the heat exchange medium. The first passage 131 has a first end 138 and a second end 139, and the first end 138 and the second end 139 are respectively communicated with the first interface 133 and the second interface 134. The second passage 132 includes a first part 1321 and a second part 1322, and the first part 1321 is communicated with the third passage 141 and the first interface 133, and the second part 1322 is communicated with the third passage 141 and the second interface 134.

[0078] The heat exchange medium flows into the first thermal management member 130 through the first interface 133, and the heat exchange medium is heated after flowing in the first thermal management member 130 and the second thermal management member 140. The heated heat exchange medium flows out of the first thermal management member 130 through the second interface 134, and the external low-temperature or cooled heat exchange medium flows into the first thermal management member 130 through the first interface 133 again, thereby improving the heat dissipation effect of the heat exchange medium on the first battery cell assembly 110 and the second battery cell assembly 120.

[0079] The heat exchange medium in the first thermal management member 130 and the second thermal management member 140 is discharged through the second interface 134, in which case, the interface for discharging the heat exchange medium does not need to be arranged on the second thermal management member 140, so that the structure of the second thermal management member 140 can be simplified, and the processing difficulty of the second thermal management member 140 is reduced.

[0080] Of course, in other embodiments, the interface for discharging the heat exchange medium can also be arranged on the second thermal management member 140.

[0081] In a possible embodiment, the second part 1322 is distributed in a staggered manner with the first battery cell assembly 110, or the first battery cell assembly 110 covers at least a part of the second part 1322.

[0082] In the case that the temperature of the heat exchange medium flowing out of the third channel 141 is high, the second part 1322 needs to be kept away from the first cell assembly 110 to reduce the heat transferred from the second part 1322 to the first cell assembly 110. In the embodiment, the second part 1322 is distributed in a staggered manner with the first cell assembly 110, for example, in the case that the first thermal management member 130 is arranged at the bottom of the first cell assembly 110, the first cell assembly 110 does not cover the second part 1322. The heat exchange medium in the second part 1322 does not flow through the bottom of the first cell assembly 110 during the flow process, thereby reducing the heat transferred from the second part 1322 to the first cell assembly 110.

[0083] Of course, in the case that the temperature of the heat exchange medium flowing out of the third channel 141 is low, it means that the temperature of the heat exchange medium is not too high after the heat exchange between the heat exchange medium and the second cell assembly 120. In this case, the first cell assembly 110 covers at least part of the second part 1322, and the heat exchange medium in this part can continue to be used to further cool the first cell assembly 110. In the embodiment, the first cell assembly 110 covers at least part of the second part 1322, so that the heat exchange medium can be fully used to cool the first cell assembly 110, which can improve the cooling effect of the first cell assembly 110 and reduce energy waste.

[0084] In combination with FIGS. 1, 2 and 3, Figure 1 and Figure 4 In a possible embodiment, the battery device 100 further includes a flow channel connector 160, the flow channel connector 160 is connected with the first interface 133, and the flow channel connector 160 is used to control the flow through the first interface 133, or the flow channel connector 160 is used to distribute the flow to the first channel 131 and the second channel 132.

[0085] In the case that the flow channel connector 160 is installed on the first thermal management member 130 and is in communication with the first interface 133, the flow channel connector 160 can realize the flow distribution function of the heat exchange medium.

[0086] For example, the flow channel connector 160 can be an electromagnetic valve or a manually adjustable valve, the inlet or outlet of the flow channel connector 160 is in communication with the first interface 133, and by adjusting the opening size of the channel in the flow channel connector 160, the flow through the first interface 133 can be controlled.

[0087] According to the heat exchange requirements of the first and second battery cell assemblies 110 and 120, the flow rate through the first interface 133 is adaptively adjusted, and the flow rate of the heat exchange medium flowing into the first heat management member 130 can effectively cool the first and second battery cell assemblies 110 and 120, and can also reduce energy waste.

[0088] Alternatively, the flow channel connecting member 160 can control the flow rates to the first and second channels 131 and 132, respectively. For example, the flow channel connecting member 160 has a three-way structure, the first interface of the flow channel connecting member 160 is connected to the first interface 133, the second interface of the flow channel connecting member 160 is connected to the first channel 131, and the third interface of the flow channel connecting member 160 is connected to the second channel 132.

[0089] In this way, the flow rates of the first and second channels 131 and 132 can be distributed, and the flow rates of the heat exchange medium flowing into the first and second channels 131 and 132 can be adaptively adjusted according to the heat exchange requirements of the first and second battery cell assemblies 110 and 120, so that the first and second battery cell assemblies 110 and 120 can be effectively cooled.

[0090] To realize two different flow channel structures, the first heat management member 130 is provided with an adjustable flow channel connecting member 160, which can distribute the flow channels and control the flow rates according to actual requirements, so that the flow rates of the heat exchange medium can be flexibly distributed.

[0091] The flow channel connecting member 160 is made of a high-thermal-conductivity material and has multiple shunt channels designed inside, which can adjust the shunt ratio of the heat exchange medium according to cooling requirements. The connection between the flow channel connecting member 160 and the first heat management member 130 is designed to be sealed to prevent leakage of the heat exchange medium.

[0092] As shown in FIG. 1, Figure 1 In one possible embodiment, the first and second interfaces 133 and 134 are arranged on the same side of the first heat management member 130.

[0093] When the first and second interfaces 133 and 134 are installed on the same side of the first heat management member 130, the installation of the first and second interfaces 133 and 134 can be facilitated, and external pipeline structures can be conveniently installed on the same side of the first heat management member 130.

[0094] Of course, in other embodiments, the first and second interfaces 133 and 134 can be arranged on adjacent sides of the first heat management member 130, or on opposite sides of the first heat management member 130.

[0095] In combination with Figure 1 andFigure 5 As shown in FIG. 1, in one possible embodiment, a portion of the first thermal management member 130 is bent in a direction away from the first battery cell assembly 110 to form protrusions 136 on a side of the first thermal management member 130 away from the first battery cell assembly 110, and the number of the protrusions 136 is multiple, and the first channel 131 and the second channel 132 are both arranged at intervals from the protrusions 136.

[0096] The portion of the first thermal management member 130 is bent so that a portion of the first thermal management member 130 protrudes in a direction away from the first battery cell assembly 110 to form the protrusions 136 on a side of the first thermal management member 130 away from the first battery cell assembly 110.

[0097] The protrusions 136 can strengthen the structural stability of the first thermal management member 130 so that the first thermal management member 130 is not prone to deformation, and the first thermal management member 130 can stably adhere to the first battery cell assembly 110 so as to stably dissipate heat from the first battery cell assembly 110.

[0098] Similarly, the same protruding structure can be arranged on the second thermal management member 140.

[0099] The first thermal management member 130 is provided with multiple protrusions 136 so as to strengthen the structural strength of the first thermal management member 130 at various positions, and the protrusions 136 are arranged at intervals from the first channel 131, and the protrusions 136 are not prone to affecting the flow smoothness of the heat exchange medium in the first channel 131. Of course, the protrusions 136 also need to be arranged at intervals from the second channel 132.

[0100] In combination with Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown in FIG. 1, in one possible embodiment, the protrusions 136 form grooves 137 on a side thereof facing the first battery cell assembly 110. The battery device 100 further comprises heat-conducting fins 170, and the first channel 131 and the grooves 137 are connected in heat conduction through the heat-conducting fins 170, and / or the second channel 132 and the grooves 137 are connected in heat conduction through the heat-conducting fins 170.

[0101] The protrusions 136 are hollow on the inner side thereof, and therefore, the protrusions 136 form the grooves 137 on a side thereof facing the first battery cell assembly 110.

[0102] During the working process of the first battery cell assembly 110, the position of the first thermal management member 130 where the first channel 131 is not arranged will be heated to a high temperature, and due to the influence of the processing difficulty, the flow channel shape design, etc., part of the positions of the first thermal management member 130 are not suitable for arranging the first channel 131, and the position of the first thermal management member 130 where the first channel 131 is not arranged cannot cool the first battery cell assembly 110.

[0103] The heat-conducting fin 170 is arranged between the first channel 131 and the groove 137 to conductively connect them. The heat-conducting fin 170 is made of a material with high thermal conductivity, and thus has good heat-conducting performance. The interior of the groove 137 exchanges heat with the heat exchange medium in the first channel 131 through the heat-conducting fin 170, thereby cooling the interior of the groove 137. The position of the groove 137 in the first battery cell assembly 110 can also be cooled, thereby facilitating the heat dissipation of the first battery cell assembly 110.

[0104] Similarly, when the second thermal management member 140 is provided with a protruding structure, a heat-conducting fin 170 can also be arranged between the second channel 132 and the groove structure.

[0105] The first thermal management member 130 and the second thermal management member 140 in the embodiment are made of high-thermal-conductivity materials, and multiple heat-conducting fins 170 are designed in the first thermal management member 130 and the second thermal management member 140. The heat-conducting fins 170 increase the heat dissipation area of the first thermal management member 130 and the second thermal management member 140, and improve the heat dissipation efficiency. In addition, the contact surfaces between the first thermal management member 130 and the first battery cell assembly 110, and between the second thermal management member 140 and the second battery cell assembly 120 are specially treated, which facilitates the heat conduction performance between the contact components.

[0106] The design of the heat-conducting fin 170 needs to take into account the requirements of heat dissipation efficiency and material lightweight. The shape and arrangement of the heat-conducting fin 170 need to be optimized by fluid dynamics, so that the heat exchange medium can be uniformly distributed in the first thermal management member 130 and the second thermal management member 140, and the heat dissipation efficiency is improved.

[0107] In a possible embodiment, the battery device 100 further includes a box 180, and the first battery cell assembly 110, the second battery cell assembly 120, the first thermal management member 130, and the second thermal management member 140 are located in the box 180. The second thermal management member 140 is locked in the box 180. The first battery cell assembly 110 is adhesively fixed to the first thermal management member 130, and the second thermal management member 140 is arranged in a spaced manner with the first battery cell assembly 110.

[0108] The first cell assembly 110 is fixed to the first thermal management member 130 by structural glue, so that the position of the first cell assembly 110 is fixed, and the first cell assembly 110 is not easy to move relative to the first thermal management member 130. The second thermal management member 140 is locked inside the box body 180, and the position of the second thermal management member 140 is also fixed. In addition, the second thermal management member 140 and the first cell assembly 110 are spaced apart, which can reduce the probability of contact between the second thermal management member 140 and the first cell assembly 110, thereby reducing the probability of wear between the second thermal management member 140 and the first cell assembly 110 due to contact, and facilitating to reduce the damage rate of the second thermal management member 140 and the first cell assembly 110.

[0109] In combination with Figure 1 , Figure 2 , Figure 3 and Figure 7 , in a possible embodiment, the first cell assembly 110 includes a first sub-cell 111 and a second sub-cell 112. The first sub-cell 111 is distributed in a staggered manner with the second cell assembly 120, and the second sub-cell 112 is distributed in a stacked manner with the second cell assembly 120. The battery device 100 further includes a first end plate 191, a second end plate 192, a third end plate 193, and a connecting member 194. The first end plate 191 is connected to the box body 180, and the first end plate 191 is connected to two sides of the first sub-cell 111 away from each other. The second end plate 192 is connected to two sides of the second sub-cell 112 away from each other, and the third end plate 193 is connected to two sides of the second cell assembly 120 away from each other. The connecting member 194 connects the second end plate 192 and the third end plate 193 to the box body 180.

[0110] Under the condition of space limitation, part of the first cell assembly 110 is distributed in a staggered manner with the second cell assembly 120, and another part of the first cell assembly 110 is distributed in a stacked manner with the second cell assembly 120. Among them, the first end plate 191 is arranged on two sides of the first sub-cell 111 away from each other. The first end plate 191 can be fixed to the first sub-cell 111 by a binding belt, and then the first end plate 191 is fixed to the box body 180.

[0111] The second end plate 192 is arranged on two sides of the second sub-cell 112 away from each other. The second end plate 192 can be fixed to the second sub-cell 112 by a binding belt. The third end plate 193 is arranged on two sides of the second cell assembly 120 away from each other. The third end plate 193 can be fixed to the second cell assembly 120 by a binding belt. The connecting member 194 passes through the second end plate 192 and the third end plate 193, and then the second end plate 192 and the third end plate 193 are locked to the box body 180 through the connecting member 194.

[0112] The box body 180 adopts a lightweight aluminum alloy material, so that the box body 180 has high strength and good heat dissipation performance.

[0113] The design of the first end plate 191, the second end plate 192, and the third end plate 193 needs to balance strength and lightweight requirements. The first end plate 191, the second end plate 192, and the third end plate 193 can be made of high-strength aluminum alloy or carbon fiber composite material. The first end plate 191, the second end plate 192, and the third end plate 193 are connected to the housing 180 by bolts, which helps improve the stability and reliability of the two battery cell assemblies.

[0114] The first battery cell assembly 110 and the second battery cell assembly 120 are each composed of multiple battery cells, which are connected by laser welding technology to form a stable battery module.

[0115] In the first cell assembly 110, the cells are arranged in parallel, with a third channel 141 between them, allowing the heat exchange medium to fully contact the cell surface and remove heat. In the second cell assembly 120, the cells are arranged in parallel to make full use of space and increase the battery pack's capacity.

[0116] The battery cells are connected using laser welding technology to form a stable battery device 100. The connection method of the battery cells needs to meet the requirements of high current density and high reliability, so that the contact resistance between the battery cells is not too high, thereby reducing heat loss.

[0117] The embodiments of this application design two different water-cooled plate flow channel structures to meet different heat dissipation requirements.

[0118] by Figure 1 Taking a mid-range perspective as an example, in the first flow channel structure, the heat exchange medium inlet is located at the lower left corner of the housing 180. The heat exchange medium in the second channel 132 first flows through the lower first thermal management component 130 to dissipate heat for the lower first battery cell assembly 110. Then, the heat exchange medium enters the upper second thermal management component 140 through the first connecting pipe 150 to dissipate heat for the upper second battery cell assembly 120. Finally, the heat exchange medium flows out from the upper right corner of the housing 180. In this embodiment, the first battery cell assembly 110 and the second battery cell assembly 120 are distributed vertically. Of course, in other embodiments, the first battery cell assembly 110 and the second battery cell assembly 120 can also be distributed horizontally or otherwise.

[0119] by Figure 4 Taking a medium-angle view as an example, the heat exchange medium inlet is also located at the lower left corner of the housing 180. The heat exchange medium in the second channel 132 flows directly to the upper second thermal management component 140 to dissipate heat for the upper second battery cell assembly 120. After flowing out of the upper second thermal management component 140, the heat exchange medium flows to the lower first thermal management component 130 to continue dissipating heat for the lower first battery cell assembly 110. Finally, the heat exchange medium flows out from the upper right corner of the housing 180.

[0120] In the utility model, the term "a plurality of" refers to two or more than two, unless otherwise expressly limited. The terms "mounting", "connected", "connected", "fixed" and other terms should be understood broadly, for example, "connected" can be fixedly connected, or can be detachably connected, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0121] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "a specific embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0122] The above only describes the preferred embodiments of the utility model, and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery device, characterized in that, include: First battery cell assembly; The second battery cell assembly is provided, wherein the first battery cell assembly and the second battery cell assembly are stacked together. A first thermal management component is disposed on one side of the first battery cell assembly and is thermally connected to the first battery cell assembly. The first thermal management component is provided with a first interface, a first channel and a second channel. The heat exchange medium flows into the first channel and the second channel through the first interface. The length of the first channel covered by the first battery cell assembly is greater than the length of the second channel covered by the first battery cell assembly. The second thermal management component is disposed on one side of the second battery cell assembly and is thermally connected to the second battery cell assembly. The second thermal management component is provided with a third channel, which is connected to the second channel and is used for the passage of the heat exchange medium.

2. The battery device according to claim 1, characterized in that, The first cell assembly covers at least a portion of the first channel, and the second channel is offset from the first cell assembly.

3. The battery device according to claim 1, characterized in that, The first cell assembly covers at least a portion of the first channel, and the first cell assembly covers at least a portion of the second channel.

4. The battery device according to any one of claims 1 to 3, characterized in that, The first thermal management component and the second thermal management component are stacked and distributed. The battery device also includes a first connecting pipe, and the second channel and the third channel are connected through the first connecting pipe.

5. The battery device according to any one of claims 1 to 3, characterized in that, The first thermal management component is also provided with a second interface, the first interface being used for the flow of the heat exchange medium and the second interface being used for the flow of the heat exchange medium out. The first channel has a first end and a second end, and the first end and the second end are respectively connected to the first interface and the second interface; The second channel includes a first part and a second part, the first part connecting the third channel and the first interface, and the second part connecting the third channel and the second interface.

6. The battery device according to claim 5, characterized in that, The second part is misaligned with the first cell assembly; or, the first cell assembly covers at least a portion of the second part.

7. The battery device according to claim 5, characterized in that, The first interface and the second interface are located on the same side of the first thermal management component.

8. The battery device according to any one of claims 1 to 3, characterized in that, The battery device also includes: A flow channel connector is connected to the first interface. The flow channel connector is used to control the flow rate through the first interface, or the flow channel connector is used to distribute the flow rate to the first channel and the second channel.

9. The battery device according to any one of claims 1 to 3, characterized in that, A portion of the first thermal management component is bent away from the first cell assembly to form a protrusion on the side of the first thermal management component away from the first cell assembly. There are multiple protrusions, and the first channel and the second channel are spaced apart from the protrusions.

10. The battery device according to claim 9, characterized in that, The protrusion forms a groove on the side facing the first cell assembly; The battery device also includes: The heat-conducting fins connect the first channel and the groove through the heat-conducting fins.

11. The battery device according to any one of claims 1 to 3, characterized in that, The battery device also includes: The housing contains the first battery cell assembly, the second battery cell assembly, the first thermal management component, and the second thermal management component. The second thermal management component is locked to the housing. The first battery cell assembly is bonded and fixed to the first thermal management component, and the second thermal management component is spaced apart from the first battery cell assembly.

12. An electrical appliance, characterized in that, include: The battery device as described in any one of claims 1 to 11.

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