Liquid cooling module and battery pack

Abstract

The application discloses a liquid cooling module and a battery pack, and relates to the technical field of battery pack heat dissipation. The liquid cooling module comprises a first liquid cooling plate, a flow channel in the first liquid cooling plate, a liquid inlet formed at one end of the flow channel, a liquid outlet formed at the other end of the flow channel, a heat-conducting pad with elastic deformation capacity, laid on the surface of the first liquid cooling plate, a plurality of battery cells, the plurality of battery cells being arranged on the heat-conducting pad along the surface direction of the first liquid cooling plate, a temperature detection element arranged on each battery cell, a limiting device connected to the first liquid cooling plate, the limiting device limiting the plurality of battery cells to be pressed against the heat-conducting pad, an adjustable heat dissipation device capable of dissipating heat for any battery cell, and a control module connected to the adjustable heat dissipation device and each temperature detection element, the control module controlling the adjustable heat dissipation device to work in response to the detection signal of the temperature detection element. The application can realize synchronous heat dissipation of all battery cells and targeted heat dissipation of a certain battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack heat dissipation, and in particular to a liquid cooling module and a battery pack. BACKGROUND

[0002] In the new energy industry, the battery cabinet, as the core equipment of the energy storage system, the battery replacement system and the large power supply scene, integrates multiple battery packs inside to jointly undertake the key functions of energy storage and output. The running stability and safety of the battery pack directly determine the reliability of the entire battery cabinet system.

[0003] Generally, in the actual application of the battery cabinet, multiple battery packs are densely arranged and are in a high-load charging and discharging cycle state for a long time. Since multiple battery packs continuously generate a large amount of heat during charging and discharging, in order to ensure the running environment adapted by the battery pack, a thermal management system is installed in the battery cabinet accordingly.

[0004] The common thermal management system can be divided into natural heat dissipation, liquid cooling and air cooling according to the heat dissipation mode. Natural heat dissipation and air cooling are more commonly used in early low-power-density and small-capacity battery cabinets due to their simple structure and low cost. However, with the continuous increase in capacity and power density of the battery cabinet due to the increasing demand for energy storage, the number of battery packs in a single battery cabinet is increasingly dense, and the number of battery cells that make up a single battery pack also increases significantly. In order to ensure the running safety, the liquid cooling system with more stable heat dissipation efficiency and higher heat transfer coefficient but higher cost has become the mainstream heat dissipation mode today.

[0005] The existing liquid cooling system generally includes a liquid cooling plate, and the liquid cooling plate is internally provided with flow channels of different forms for the flow of a liquid cooling medium. In use, the heat generated by the battery cells during operation is guided and transferred to the liquid cooling plate, and then the liquid cooling medium is circulated in the flow channels by an external circulating cooling device to take away the heat on the liquid cooling plate to complete heat dissipation. When the heat generation of the battery cells increases, the heat dissipation capacity can be improved by increasing the flow rate.

[0006] The existing liquid cooling system can only synchronously dissipate heat for all battery cells that make up a battery pack, and it cannot quickly dissipate heat for a specific battery cell. This can cause the battery pack to run at risk. On the one hand, individual battery cells can be short-circuited due to differences in factory structure, performance degradation or use problems after long-term operation, and the battery cells can quickly heat up in a short time to form local hot spots, and the heat is difficult to dissipate in a certain area or a certain battery cell. On the other hand, for multiple battery cells in any style of battery pack, such as multiple battery cells in a matrix distribution, the battery cells in the central region lack physical space for heat dissipation outward and are affected by the heat conduction of adjacent battery cells. The heat is prone to accumulate under the superposition of neighborhood conduction and self-generation, which can cause the temperature of multiple battery cells to be unbalanced. SUMMARY

[0007] In order to realize synchronous heat dissipation of all battery cells and targeted heat dissipation of a certain battery cell, the application provides a liquid cooling module and a battery pack.

[0008] The application provides a liquid cooling module adopting the following technical scheme:

[0009] A liquid cooling module comprises:

[0010] A first liquid cooling plate comprises an internal flow channel, one end of which is formed into a liquid inlet, and the other end is formed into a liquid outlet;

[0011] A heat-conducting pad has elastic deformation capacity and is laid on the surface of the first liquid cooling plate;

[0012] A plurality of battery cells are arranged on the heat-conducting pad along the surface direction of the first liquid cooling plate, and each battery cell is provided with a temperature detection element;

[0013] A limiting device is connected to the first liquid cooling plate, and the limiting device limits the plurality of battery cells to be pressed against the heat-conducting pad;

[0014] An adjustable heat dissipation device can individually dissipate heat from any battery cell;

[0015] A control module is connected to the adjustable heat dissipation device and each temperature detection element, and the control module controls the operation of the adjustable heat dissipation device in response to the detection signal of the temperature detection element;

[0016] The adjustable heat dissipation device comprises a second liquid cooling plate, and a phase change heat absorption element is arranged on the second liquid cooling plate corresponding to each battery cell, the phase change heat absorption element can move to contact the second liquid cooling plate or the battery cell, and adjacent phase change heat absorption elements are kept in contact to enable heat conduction between them; The second liquid cooling plate is also provided with a position adjusting mechanism, which can make any phase change heat absorption element contact the corresponding battery cell and make at least one phase change heat absorption element contact the second liquid cooling plate.

[0017] By adopting the above technical scheme, the application can make different heat dissipation measures based on the heat generation of the plurality of battery cells to achieve the purpose of efficient heat dissipation.

[0018] When the plurality of battery cells are in a normal operating state, i.e., the temperature of each battery cell is only slightly increased and relatively consistent, the external circulating cooling equipment supplies cooling medium into the flow channel through the liquid inlet and discharges it from the liquid outlet, so that the cooling medium can continuously take away the heat of the plurality of battery cells to ensure that the temperature of the plurality of battery cells is constant.

[0019] When the temperatures of the plurality of battery cells continue to rise but remain relatively consistent, the plurality of phase change heat sinks are driven by the positioning mechanism to contact the battery cells to assist in dissipating heat from the battery cells, at which time the first liquid cooling plate and the phase change heat sinks simultaneously dissipate heat from the battery cells;

[0020] When the temperatures of the plurality of battery cells continue to rise but remain relatively consistent, the plurality of phase change heat sinks are driven by the positioning mechanism to contact the battery cells to assist in dissipating heat from the battery cells, at which time the first liquid cooling plate and the phase change heat sinks simultaneously dissipate heat from the battery cells;

[0021] When the temperatures of the plurality of battery cells continue to rise but remain relatively consistent, the plurality of phase change heat sinks are driven by the positioning mechanism to contact the battery cells to assist in dissipating heat from the battery cells, at which time the first liquid cooling plate and the phase change heat sinks simultaneously dissipate heat from the battery cells;

[0022] In addition, the limiting device can limit the plurality of battery cells to abut against the heat-conducting pad, and the heat-conducting pad has elastic deformation capability. When the battery cells expand or shrink, the heat-conducting pad provides space for the battery cells to deform. The structural design of the limiting device and the heat-conducting pad can ensure that the battery cells can maintain sufficient contact with the heat-conducting pad when the battery cells expand or shrink, so that heat on the battery cells can be conducted to the first liquid cooling plate through the heat-conducting pad and dissipated.

[0023] Preferably, the positioning mechanism comprises a state switching assembly, each phase change heat sink has an elastic buckle structure, each phase change heat sink has a first state of contacting the battery cell and a second state of contacting the second liquid cooling plate, the elastic buckle structure is used to maintain the phase change heat sink in the first state or the second state, and the state switching assembly is used to switch the phase change heat sink between the first state and the second state.

[0024] By adopting the above technical solution, the position of the phase change heat sink can be maintained in the first state or the second state based on the elastic buckle structure, and the phase change heat sink can be moved to switch between the first state and the second state based on the state switching assembly.

[0025] Preferably, the phase change heat sink comprises a guide column, the second liquid cooling plate is provided with a guide hole, and the guide column is slidingly arranged in the guide hole; the elastic buckle structure comprises a clamping plate, the clamping plate is connected to the guide column, the guide hole is provided with a clamping groove, and the clamping plate can be clamped into the clamping groove to keep the phase change heat sink in the second state; the elastic buckle structure further comprises a pressing spring, one end of the pressing spring is connected to the second liquid cooling plate, and the other end of the pressing spring is connected to the phase change heat sink, and when the clamping plate is not clamped in the clamping groove, the pressing spring can press and keep the phase change heat sink in the first state.

[0026] By adopting the above technical scheme, when the clamping plate is clamped in the clamping groove, the phase change heat sink is kept in the second state; when the clamping plate is separated from the clamping groove, the pressing spring can press and keep the phase change heat sink in the first state.

[0027] Preferably, the clamping plate comprises a horizontal plate part, a vertical plate part and a clamping pin part connected in sequence, the clamping pin part is obliquely connected to the vertical plate part, the horizontal plate part, the vertical plate part and the clamping pin part all have elastic deformation capability, the horizontal plate part is connected to the guide column, and the clamping pin part is used for clamping into the clamping groove.

[0028] By adopting the above technical scheme, the clamping pin plate can be forced to separate from the clamping groove, and the oblique arrangement of the clamping pin plate on the vertical plate part can facilitate the subsequent clamping of the clamping pin plate into the clamping groove.

[0029] Preferably, the state switching assembly comprises a horizontal driving member, the second liquid cooling plate is provided with an installation cavity in communication with each clamping groove, the horizontal driving member is installed in the installation cavity, the horizontal driving member is further connected with a telescopic member, the telescopic member is connected with a pushing column, the horizontal driving member is used to drive the pushing column to move to the side of any clamping plate, and the telescopic member is used to drive the pushing column to move to push the clamping plate away from the clamping groove so that the phase change heat sink moves from the second state to the first state.

[0030] The limiting device is provided with a driving assembly, the second liquid cooling plate is connected to the driving assembly, and the driving assembly can drive the second liquid cooling plate to move so that the phase change heat sink moves from the first state to the second state.

[0031] By adopting the above technical scheme, when a local hot spot occurs, the clamping plate close to the heat-generating battery cell is pushed away from the clamping groove by driving the horizontal driving member and the telescopic member to quickly move the pushing column, and under the action of the pressing spring, the phase change heat sink close to the heat-generating battery cell moves from the second state to the first state, and this phase change heat sink can absorb the heat of the heat-generating battery cell and realize the continuous heat absorption of the phase change heat sink to the battery cell under the action of the second liquid cooling plate. When the temperature of the battery cell is stable, the second liquid cooling plate is driven to move by the driving assembly, so that the phase change heat sink moves from the first state to the second state, and at this time, the clamping plate will be clamped into the clamping groove.

[0032] Preferably, the limiting device comprises a mounting plate connected to the first liquid cooling plate, the mounting plate is provided with a steel belt around the plurality of battery cells, and the steel belt presses the plurality of battery cells against the heat-conducting pad.

[0033] By adopting the above technical scheme, the steel belt with elastic deformation capacity is used to press the plurality of battery cells against the heat-conducting pad, so as to prevent the gap between the battery cells and the heat-conducting pad when the battery cells expand and shrink. In addition, in the present application, even if the steel belt is damaged and fails due to deformation caused by the expansion and shrinkage of the battery cells for many times, the phase change heat-absorbing member can still press the battery cells based on the pressing spring, so as to ensure that the battery cells are tightly attached to the heat-conducting pad.

[0034] Preferably, a heat-conducting pad with elastic deformation capacity is arranged between adjacent battery cells, and the heat-conducting pad is in contact with the heat-conducting pad.

[0035] By adopting the above technical scheme, the heat-conducting pad provides a deformation space for the adjacent battery cells, and the heat on the battery cells can also be conducted to the heat-conducting pad through the heat-conducting pad and then to the first liquid cooling plate.

[0036] Preferably, the first liquid cooling plate comprises liquid cooling sub-plate one and liquid cooling sub-plate two connected to each other, the flow channel is formed between the liquid cooling sub-plate one and the liquid cooling sub-plate two, and the liquid cooling sub-plate one and the liquid cooling sub-plate two can be separated to expose the flow channel.

[0037] By adopting the above technical scheme, the liquid cooling sub-plate one and the liquid cooling sub-plate two can be separated to clean the flow channel.

[0038] Preferably, the plurality of battery cells are divided into two groups, wherein the two groups of battery cells are a first power supply group and a second power supply group, the first power supply group is located on one side of the heat-conducting pad, and the second power supply group is located on the other side of the heat-conducting pad.

[0039] By adopting the above technical scheme, the present application can install battery cells with the largest possible density to meet the power supply demand.

[0040] The present application also discloses a battery pack comprising a box body and a plurality of the liquid cooling modules.

[0041] In summary, the present application has at least one of the following beneficial technical effects:

[0042] 1. The application can make different heat dissipation measures based on the heat generation of multiple battery cells to achieve the purpose of efficient heat dissipation. When multiple battery cells are in normal operating state, i.e. the temperature of each battery cell is only slightly increased and relatively consistent, the cooling medium is supplied to the flow channel through the inlet by using external circulating cooling equipment, and is discharged from the outlet, so that the cooling medium can continuously take away the heat of multiple battery cells to ensure the constant temperature of multiple battery cells; when the temperature of multiple battery cells continues to rise but still remains relatively consistent, the positioning mechanism is used to drive multiple phase change heat sinks to contact the battery cells to assist in completing the heat dissipation of multiple battery cells, at this time, the first liquid cooling plate and the phase change heat sink simultaneously dissipate heat from the battery cells; when the temperature of multiple battery cells rises again but still remains relatively consistent, the second liquid cooling plate is used to contact the phase change heat sink to complete the cooling of the phase change heat sink, so that the phase change heat sink can continuously absorb the heat generated by the battery cells, i.e. the first liquid cooling plate and the second liquid cooling plate simultaneously cool the battery cells; when an individual battery cell rapidly heats up to form a local hot spot, the temperature detection piece installed on the battery cell sends a signal to the control module, the control module controls the positioning mechanism to drive the phase change heat sink corresponding to the battery cell to contact the battery cell, the heat generated by the battery cell is conducted to the second liquid cooling plate through the corresponding phase change heat sink, at the same time, the heat on the phase change heat sink is also conducted to the second liquid cooling plate through the adjacent phase change heat sink, at this time, the second liquid cooling plate works to target cooling of the battery cell; of course, at this time, the first liquid cooling plate also works to ensure that the cooling of the battery cell can be completed. In addition, since the limiting device can limit multiple battery cells to be pressed against the heat-conducting pad, and the heat-conducting pad has elastic deformation capability, when the battery cells swell and shrink, the heat-conducting pad provides space for the battery cells to deform, and the structural design of the limiting device and the heat-conducting pad can ensure that the battery cells can maintain full contact with the heat-conducting pad when they swell and shrink, so that the heat on the battery cells can be conducted to the first liquid cooling plate through the heat-conducting pad and dissipated;

[0043] 2. When a local hot spot appears, the push column is quickly moved by driving the lateral drive and the telescopic piece to push the clamping plate away from the clamping groove, under the action of the pressing spring, the phase change heat sink close to the heat-generating battery cell moves from the second state to the first state, the phase change heat sink can absorb the heat of the heat-generating battery cell and realize the continuous heat absorption of the phase change heat sink to the battery cell under the action of the second liquid cooling plate. When the temperature of the battery cell stabilizes, the second liquid cooling plate is moved by driving the drive assembly, so that the phase change heat sink moves from the first state to the second state, at this time, the clamping plate will be clamped into the clamping groove again;

[0044] 3. The steel belt with elastic deformation capability is used to press multiple battery cells against the heat-conducting pad to prevent gaps between the battery cells and the heat-conducting pad when the battery cells swell and shrink. In addition, even if the steel belt is damaged and fails due to deformation caused by swelling and shrinking of the battery cells multiple times, the phase change heat sink can still be pressed against the battery cell based on the pressing spring to ensure that the battery cell is tightly attached to the heat-conducting pad. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 Fig. 1 is a structural schematic diagram of a liquid cooling module in an embodiment of the present application;

[0046] Figure 2 Fig. 2 is a structural schematic diagram for embodying a first liquid cooling plate;

[0047] Figure 3 Fig. 3 is a structural schematic diagram for embodying an electric core;

[0048] Figure 4 Fig. 4 is a structural schematic diagram for embodying a limiting device;

[0049] Figure 5 Fig. 5 is a sectional view for embodying a second liquid cooling plate;

[0050] Figure 6 Fig. 6 is a sectional view for embodying a phase change heat absorption piece;

[0051] Figure 7 Fig. 7 is a sectional view for embodying an elastic buckle structure;

[0052] Figure 8 Fig. 8 is a sectional view for embodying a state switching assembly;

[0053] Figure 9 Fig. 9 is a structural schematic diagram for embodying a clamping plate;

[0054] Figure 10 Fig. 10 is a structural schematic diagram of a battery cabinet; Figure 5 Fig. 11 is an enlarged view of part A in Fig. 10;

[0055] Figure 11 Fig. 12 is an enlarged view of part B in Fig. 10; Figure 1 Fig. 13 is a structural schematic diagram of a battery cabinet;

[0056] Figure 12 Fig. 14 is a structural schematic diagram of a battery cabinet;

[0057] Figure 13 Fig. 15 is a structural schematic diagram for embodying a bearing frame.

[0058] Marked in the drawings: 1, the first liquid cooling plate; 11, flow channel; 111, liquid inlet; 112, liquid outlet; 12, liquid cooling sub-plate one; 13, liquid cooling sub-plate two; 2, heat-conducting pad; 3, electric core; 31, aluminum row; 4, limiting device; 41, mounting plate; 42, steel belt; 5, heat-conducting pad; 6, adjustable heat dissipation device; 61, second liquid cooling plate; 611, guide hole; 6111, clamping groove; 612, mounting cavity; 62, phase-change heat-absorbing piece; 621, block; 6211, containing cavity; 622, guide column; 623, heat-conducting buffer sheet; 63, position adjusting mechanism; 631, state switching assembly; 6311, transverse driving piece; 6312, telescopic piece; 6313, push column; 632, elastic buckle structure; 6321, clamping plate; 63211, transverse plate part; 63212, vertical plate part; 63213, clamping pin part; 6322, pressure spring; 64, driving assembly; 641, connecting plate; 642, transmission shaft; 643, transmission gear; 644, transmission rack; 645, fixed frame; 646, first rotating gear; 647, second rotating gear; 648, rotating piece; 649, fan; 7, box body; 71, positioning pin; 72, caster; 8, cabinet body; 81, bearing frame; 811, containing hole; 812, positioning hole. DETAILED DESCRIPTION

[0059] The application will be further described below in conjunction with the drawings.

[0060] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0061] The embodiments of the application disclose a liquid cooling module and a battery pack. The liquid cooling module can realize synchronous heat dissipation of all electric cores and targeted heat dissipation of a certain electric core.

[0062] Reference Figure 1 , Figure 2 and Figure 3A liquid cooling module includes a first liquid cooling plate 1, the first liquid cooling plate 1 includes an internal flow channel 11, one end of the flow channel 11 is formed as a liquid inlet 111, and the other end of the flow channel 11 is formed as a liquid outlet 112. The upper end face and the lower end face of the first liquid cooling plate 1 are both paved with a heat-conducting pad 2, the heat-conducting pad 2 has elastic deformation capability, and the material of the heat-conducting pad 2 is, for example, silica gel; the heat-conducting pad 2 is installed with a plurality of battery cells 3, specifically, the battery cells 3 are provided in a plurality of numbers and are arranged as much as possible in a limited space, the plurality of battery cells 3 are divided into two groups, and the two groups of battery cells 3 are structurally identical, wherein the two groups of battery cells 3 are respectively a first power supply group and a second power supply group, the first power supply group includes 16 battery cells 3 arranged transversely along the plate face direction of the first liquid cooling plate 1, and the first power supply group and the second power supply group are combined Figure 4 The battery cells 3 are connected by an arch-shaped aluminum bar 31 having deformation capability, the first power supply group is located on the upper side of the first liquid cooling plate 1 and is in contact with the heat-conducting pad 2, and the second power supply group is located on the lower side of the first liquid cooling plate 1 and is in contact with the heat-conducting pad 2.

[0063] When the battery cells 3 generate heat during operation, the heat on the battery cells 3 is conducted to the first liquid cooling plate 1 through the heat-conducting pad 2, at this time, an external circulating cooling device such as a water chiller is used to supply cooling medium into the flow channel 11 through the liquid inlet 111 and flow out from the liquid outlet 112, the cooling medium is generally water or glycol solution, and the flowing cooling medium can take away the heat on the first liquid cooling plate 1 to achieve the purpose of heat dissipation of the plurality of battery cells 3.

[0064] Referring to Figure 2 In order to increase the length of the flow channel 11 to improve the heat dissipation capability, the flow channel 11 is in an M shape, and the cooling capability is adjusted by controlling the external circulating cooling device to adjust the flow rate of the cooling medium in the flow channel 11. Typically, the temperature difference between the cooling medium at the position of the liquid inlet 111 and the cooling medium at the position of the liquid outlet 112 can be controlled to be within 2℃ by controlling the flow rate of the cooling medium to ensure the uniformity of heat dissipation of the plurality of battery cells 3 and the stability of temperature maintenance.

[0065] Referring to Figure 2 When impurities exist in the cooling medium, the cooling medium may block the flow channel 11, in order to facilitate cleaning of the flow channel 11, the first liquid cooling plate 1 includes a liquid cooling sub-plate one 12 and a liquid cooling sub-plate two 13 connected together, the flow channel 11 is formed between the liquid cooling sub-plate one 12 and the liquid cooling sub-plate two 13, the liquid cooling sub-plate one 12 and the liquid cooling sub-plate two 13 can be separated to expose the flow channel 11, and the liquid cooling sub-plate one 12 and the liquid cooling sub-plate two 13 can be fixed to each other by a detachable connection mode such as screw connection. Of course, if the cooling medium can be kept clean, the liquid cooling sub-plate one 12 and the liquid cooling sub-plate two 13 can be directly connected and fixed by welding to ensure the sealing of the flow channel 11.

[0066] Referring to Figure 4The liquid cooling module further comprises a limiting device 4 connected to the first liquid cooling plate 1, which limits the plurality of battery cells 3 to be pressed against the heat-conducting pad 2. Specifically, the limiting device 4 comprises a mounting plate 41 connected to the first liquid cooling plate 1, which is vertically arranged, and the mounting plate 41 is provided with two steel belts 42, which are arranged around the plurality of battery cells 3 together with the mounting plate 41, and the steel belts 42 have elastic deformation capability and press the plurality of battery cells 3 against the heat-conducting pad 2.

[0067] When installing the battery cells 3 and the steel belts 42, the battery cells 3 need to be pressed against the heat-conducting pad 2 so that the heat-conducting pad 2 is compressed, and the battery cells 3 being pressed against the heat-conducting pad 2 can ensure that there is no gap between the battery cells 3 and the heat-conducting pad 2. In this embodiment, the compression amount of the heat-conducting pad 2 is, for example, 30%, and since the battery cells 3 are usually heavy, the pressing of the heat-conducting pad 2 can be completed by using the self-weight of the battery cells 3.

[0068] During the working process of the battery cells 3, swelling and shrinking may occur. The battery cells 3 will expand when heated and shrink when cooled. Usually, the bulging of the battery cells 3 mainly occurs at the end faces thereof. In this application, the plurality of battery cells 3 are pressed against the heat-conducting pad 2 by using the steel belts 42 having elastic deformation capability, which can prevent a gap from occurring between the battery cells 3 and the heat-conducting pad 2 when the battery cells 3 swell and shrink, and the gap will cause the heat generated on the battery cells 3 to be difficult to effectively conduct to the heat-conducting pad 2, thereby causing heat accumulation. The heat-conducting pad 2 provides a vertical deformation space for the battery cells 3.

[0069] Referring to Figure 3 Since the bulging of the battery cells 3 may occur not only at the upper and lower end faces but also at the left and right end faces, in this application, in order to provide a horizontal deformation space for the battery cells 3, the heat-conducting pads 5 having elastic deformation capability are arranged between adjacent battery cells 3, the heat-conducting pads 5 also have elastic deformation capability and are made of silica gel, the heat-conducting pads 5 are in contact with the heat-conducting pad 2, and the heat on the battery cells 3 can be conducted to the heat-conducting pad 2 through the heat-conducting pads 5 and then to the first liquid cooling plate 1.

[0070] Referring to Figure 5 and Figure 6 and combining Figure 1The liquid cooling module further comprises an adjustable heat dissipation device 6, which can be used to dissipate heat for any battery cell 3. The adjustable heat dissipation device 6 is provided with one for each group of battery cells 3. Specifically, the adjustable heat dissipation device 6 comprises a second liquid cooling plate 61, which is different from the first liquid cooling plate 1 in the style of the internal flow channel 11. For example, the second liquid cooling plate 61 has a U-shaped internal flow channel 11. The second liquid cooling plate 61 can also be cooled by a water chiller by passing the liquid cooling medium into the second liquid cooling plate 61. The second liquid cooling plate 61 is located on the side of the battery cell 3 away from the first liquid cooling plate 1. The second liquid cooling plate 61 is arranged horizontally. The second liquid cooling plate 61 is provided with a phase change heat absorption part 62 corresponding to each battery cell 3. The phase change heat absorption part 62 can move to contact the second liquid cooling plate 61 or the battery cell 3. Adjacent phase change heat absorption parts 62 are in contact to enable heat conduction between them. The second liquid cooling plate 61 is further provided with a position adjusting mechanism 63. The position adjusting mechanism 63 can enable any phase change heat absorption part 62 to contact the battery cell 3 and at least one phase change heat absorption part 62 to contact the second liquid cooling plate 61.

[0071] Referring to Figure 5 , Figure 6 and Figure 7 , the position adjusting mechanism 63 comprises a state switching assembly 631. Each phase change heat absorption part 62 has an elastic buckle structure 632. Each phase change heat absorption part 62 has a first state of contacting the battery cell 3 and a second state of contacting the second liquid cooling plate 61. The elastic buckle structure 632 is used to enable the phase change heat absorption part 62 to maintain the first state or the second state. The state switching assembly 631 is used to enable the phase change heat absorption part 62 to switch between the first state and the second state.

[0072] Referring to Figure 6 and Figure 7 , the phase change heat absorption part 62 comprises a block 621. The block 621 is provided with a guide column 622 at the upper end. The guide column 622 and the block 621 are integrated. Both the guide column 622 and the block 621 can conduct heat. The second liquid cooling plate 61 is provided with a guide hole 611 at the lower end. The guide hole 611 is vertically arranged. The guide column 622 is slidingly arranged in the guide hole 611. The block 621 is provided with a heat-conducting buffer piece 623 having elastic deformation ability at the lower end. The heat-conducting buffer piece 623 is made of silica gel. Specifically, the block 621 is provided with a containing cavity 6211. The containing cavity 6211 is filled with phase change material, i.e. PCM. The phase change material is preferably a composite phase change material to make the overall weight and volume of the phase change material moderate and the heat conduction speed fast. For example, the composite phase change material is integrated with sodium acetate trihydrate, metal fins and pure gallium PCM. The pure gallium PCM can quickly absorb instantaneous heat.

[0073] Referring to Figure 6 , Figure 7 and Figure 8The elastic buckle structure 632 comprises a clamping plate 6321 connected to the guide column 622, the guide hole 611 is provided with a clamping groove 6111, and the clamping plate 6321 can be clamped into the clamping groove 6111 so that the phase change heat-absorbing piece 62 is kept in the second state. The elastic buckle structure 632 further comprises a pressing spring 6322, one end of the pressing spring 6322 is connected to the second liquid cooling plate 61, and the other end of the pressing spring 6322 is connected to the phase change heat-absorbing piece 62. When the clamping plate 6321 is not clamped in the clamping groove 6111, the pressing spring 6322 can press and keep the phase change heat-absorbing piece 62 in the first state.

[0074] With reference to Figure 8 and Figure 9 The clamping plate 6321 comprises a horizontal plate part 63211, a vertical plate part 63212 and a clamping pin part 63213 connected in sequence, the clamping pin part 63213 is obliquely connected to the vertical plate part 63212, the clamping pin part 63213 is inclined to the left from top to bottom, the horizontal plate part 63211, the vertical plate part 63212 and the clamping pin part 63213 all have elastic deformation capability, the horizontal plate part 63211 is connected to the guide column 622, and the clamping pin part 63213 is used for being clamped into the clamping groove 6111. In this embodiment, in order to ensure that the clamping pin part 63213 can be conveniently clamped into the clamping groove 6111 and the clamping pin part 63213 can be separated from the clamping groove 6111, the included angle between the clamping pin part 63213 and the vertical plate part 63212 is 20°-45°.

[0075] With reference to Figure 7 and Figure 9 The state switching assembly 631 comprises a horizontal driving piece 6311, which is preferably a sliding table electric cylinder. The second liquid cooling plate 61 is provided with a mounting cavity 612 in communication with each clamping groove 6111. The horizontal driving piece 6311 is mounted in the mounting cavity 612. The horizontal driving piece 6311 is further connected with a telescopic piece 6312. The horizontal driving piece 6311 can drive the telescopic piece 6312 to move along the length direction of the second liquid cooling plate 61. The telescopic piece 6312 is preferably a telescopic electric cylinder. The telescopic piece 6312 is connected with a pushing column 6313. The horizontal driving piece 6311 is used for driving the pushing column 6313 to move to the side of any clamping plate 6321. The telescopic piece 6312 is used for driving the pushing column 6313 to move and push the clamping plate 6321 away from the clamping groove 6111, so that the phase change heat-absorbing piece 62 moves from the second state to the first state.

[0076] With reference to Figure 5 The limiting device 4 is provided with a driving assembly 64. The second liquid cooling plate 61 is connected to the driving assembly 64. The driving assembly 64 can drive the second liquid cooling plate 61 to move, so that the phase change heat-absorbing piece 62 moves from the first state to the second state.

[0077] With reference to Figure 10 and Figure 11Specifically, the driving assembly 64 comprises a connecting plate 641 slidably connected to the mounting plate 41, the connecting plate 641 being capable of sliding up and down, the second liquid cooling plate 61 being connected to the connecting plate 641, the second liquid cooling plate 61 being capable of moving up and down synchronously with the connecting plate 641, the mounting plate 41 being rotatably connected with a transmission shaft 642, the transmission shaft 642 being provided with a transmission gear 643 capable of rotating synchronously, the connecting plate 641 being provided with a transmission rack 644, the transmission rack 644 being vertically arranged, the transmission gear 643 being engaged with the transmission rack 644, the transmission gear 643 being capable of driving the transmission rack 644 to move up and down in rotation; the mounting plate 41 is further provided with a fixing frame 645, the fixing frame 645 being rotatably connected with a first rotating gear 646 engaged with the transmission gear 643 and a second rotating gear 647 engaged with the first rotating gear 646, the first rotating gear 646 being connected with a rotating member 648, the rotating member 648 being an electric motor, the fixing frame 645 being further provided with a fan 649 on the side of the electric motor for dissipating heat of the rotating member 648.

[0078] Driving the rotating member 648 can drive the second rotating gear 647, the first rotating gear 646 and the transmission gear 643 to rotate, thereby driving the transmission rack 644 and the connecting plate 641 to move up and down.

[0079] Taking the switching of one of the phase change heat absorption members 62 above the first liquid cooling plate 1 between the first state and the second state and the maintaining in the first state or the second state as an example:

[0080] When the pin 63213 is clamped in the clamping groove 6111 so that the upper end of the phase change heat absorption member 62 abuts against and contacts the second liquid cooling plate 61, the phase change heat absorption member 62 is in the second state;

[0081] When the pin 63213 is disengaged from the clamping groove 6111, the spring 6322 will press and move the phase change heat absorption member 62 downward, and the phase change heat absorption member 62 will be pressed against the upper end face of the battery cell 3, at this time, the phase change heat absorption member 62 is in the first state;

[0082] When the phase change heat absorption member 62 is in the second state, the clamping plate 6321 close to the phase change heat absorption member 62 is pushed away from the clamping groove 6111 by driving the lateral driving member 6311 and the telescopic member 6312 to quickly move the push column 6313, and under the action of the pressing spring 6322, the phase change heat absorption member 62 will quickly move from the second state to the first state;

[0083] When the phase change heat absorption member 62 is in the first state, the connecting plate 641 is driven to move downward by the rotating member 648, so that the clamping plate 6321 is clamped into the clamping groove 6111 again, at this time, the phase change heat absorption member 62 moves from the first state to the second state.

[0084] Referring to Figure 5 , Figure 6 andFigure 7 In order to facilitate accurate control of the temperature of each battery cell 3, a temperature detection member, such as a temperature sensor, is installed on each battery cell 3. The liquid cooling module further comprises a control module connected to the adjustable heat dissipation device 6 and each temperature detection member. The control module controls the operation of the adjustable heat dissipation device 6 in response to the detection signal of the temperature detection member. Specifically, the control module is connected to the transverse driving member 6311 and the telescopic member 6312. When the temperature detection member detects that the temperature of a certain battery cell 3 is too high, the temperature detection member sends a signal to the control module. The control module controls the transverse driving member 6311 and the telescopic member 6312 to drive the push column 6313 to the side of the clamping plate 6321 corresponding to the battery cell 3, and drives the transverse driving member 6311 and the telescopic member 6312 to move the push column 6313 to push the clamping plate 6321 into the force clamping groove 6111, so that the corresponding phase change heat absorption member 62 moves to contact the overheated battery cell 3.

[0085] The present application can make different heat dissipation measures based on the heating conditions of the plurality of battery cells 3 to achieve efficient heat dissipation and ensure that the temperature of the plurality of battery cells 3 is controllable and stable.

[0086] When the plurality of battery cells 3 are in a normal operating state, i.e., the temperature of each battery cell 3 is only slightly increased and relatively consistent, the external circulating cooling equipment is used to supply cooling medium into the flow channel 11 through the liquid inlet 111 and discharge the cooling medium from the liquid outlet 112. The cooling medium continuously takes away the heat of the plurality of battery cells 3 to ensure that the temperature of the plurality of battery cells 3 is constant.

[0087] When the temperature of the plurality of battery cells 3 continues to rise but remains relatively consistent, the positioning mechanism 63 is used to drive the plurality of phase change heat absorption members 62 to contact the battery cells 3 to assist in dissipating the heat of the plurality of battery cells 3. The phase change heat absorption member 62 is in a first state. At this time, the first liquid cooling plate 1 and the phase change heat absorption member 62 simultaneously dissipate heat from the battery cells 3.

[0088] When the temperature of the plurality of battery cells 3 continues to rise but remains relatively consistent, the positioning mechanism 63 is used to drive the plurality of phase change heat absorption members 62 to contact the battery cells 3 to assist in dissipating the heat of the plurality of battery cells 3. The phase change heat absorption member 62 is in a first state. At this time, the first liquid cooling plate 1 and the phase change heat absorption member 62 simultaneously dissipate heat from the battery cells 3.

[0089] When the individual battery cell 3 rapidly heats up to form a local hot spot, the temperature detection member installed on the battery cell 3 sends a signal to the control module, the control module controls the push column 6313 to move and push the clamping plate 6321 out of the clamping groove 6111, and the phase change heat absorption member 62 corresponding to the battery cell 3 will contact the battery cell 3, and the heat generated by the battery cell 3 will be conducted to the second liquid cooling plate 61 through the corresponding phase change heat absorption member 62, at the same time, the heat on the phase change heat absorption member 62 will also be conducted to the second liquid cooling plate 61 through the adjacent phase change heat absorption member 62, at this time, the second liquid cooling plate 61 works to cool the battery cell 3; of course, at this time, the first liquid cooling plate 1 also works synchronously to ensure that the battery cell 3 can be effectively cooled. In addition, when two or more battery cells 3 rapidly heat up, the above-mentioned method can also be used to cool these battery cells 3.

[0090] When the battery cell 3 is short-circuited or has other problems, the temperature of the battery cell 3 rises very quickly, sometimes even reaching 50℃ / s, in the present application, the rapid heat conduction and cooling of the battery cell 3 can be realized based on the rapid response of the transverse driving member 6311 and the telescopic member 6312 and the rapid springing of the phase change heat absorption member 62 based on the pressing spring, and since the heat on the adjacent phase change heat absorption member 62 will be conducted, when a local hot spot occurs, the heat absorption and cooling are often completed by multiple phase change heat absorption members 62 in one area.

[0091] In the present application, the battery cell 3 is pressed tightly on the heat-conducting pad 2 by two ways: on the one hand, the steel belt 42 with elastic deformation ability is used to press the plurality of battery cells 3 on the heat-conducting pad 2; on the other hand, even if the steel belt 42 is deformed and damaged due to the expansion and contraction of the battery cell 3 for many times, after the plurality of phase change heat absorption members 62 are pressed tightly on the plurality of battery cells 3, the phase change heat absorption member 62 can be pressed on the battery cell 3 based on the pressing spring 6322, so as to ensure that the battery cell 3 is pressed tightly on the heat-conducting pad 2.

[0092] It should be noted that in the present application, the heat generated by the rotating member 648, the transverse driving member 6311 and the telescopic member 6312 during work is difficult to conduct to the battery cell 3, on the one hand, the rotating member 648, the transverse driving member 6311 and the telescopic member 6312 work at low frequency in normal state, and the heat generation is small, on the other hand, the rotating member 648 is usually located in the external environment after the assembly of the present application and is cooled by the fan 649, and the transverse driving member 6311 and the telescopic member 6312 work to generate heat and are cooled by the second liquid cooling plate 61.

[0093] Referring to Figure 12 The present application also discloses a battery pack, which comprises a box body 7 capable of being opened and closed and a plurality of liquid cooling modules, the plurality of liquid cooling modules are installed on the inner wall of the box body 7, and the number of the liquid cooling modules is two in the embodiment.

[0094] Referring to Figure 12 andFigure 13 The application also discloses a battery cabinet, which comprises a cabinet body 8 and a plurality of bearing frames 81 installed on the inner wall of the cabinet body 8, the bearing frame 81 is provided with a containing hole 811 and a positioning hole 812, a plurality of casters 72 are installed on the bottom of the box body 7, and a positioning pin 71 is installed on one end of the box body 7. The battery pack is usually heavy, and the battery pack can be moved and placed on the bearing frame 81 by using a forklift or the like, and then moved to the caster 72 into the containing hole 811 and the positioning pin 71 into the positioning hole 812 to complete the installation.

[0095] The implementation principle of the liquid cooling module and the battery pack in the embodiment of the application is as follows:

[0096] When the plurality of battery cells 3 are in a normal running state, that is, the temperature of each battery cell 3 is only slightly increased and relatively consistent, the cooling medium is supplied into the flow channel 11 through the inlet 111 and discharged from the outlet 112 by using an external circulating cooling device, and the cooling medium can continuously take away the heat of the plurality of battery cells 3 to ensure that the temperature of the plurality of battery cells 3 is constant.

[0097] When an individual battery cell 3 is rapidly heated to form a local hot spot, the temperature detection member installed on the battery cell 3 sends a signal to the control module, the control module controls the push column 6313 to move and push the clamping plate 6321 to separate from the clamping groove 6111, and the phase change heat absorption member 62 corresponding to the battery cell 3 contacts the battery cell 3, the heat generated by the battery cell 3 is conducted to the second liquid cooling plate 61 through the corresponding phase change heat absorption member 62, and at the same time, the heat on the phase change heat absorption member 62 is also conducted to the second liquid cooling plate 61 through the adjacent phase change heat absorption member 62, at this time, the second liquid cooling plate 61 is cooled by using the external circulating cooling device to perform targeted cooling on the battery cell 3.

[0098] The embodiments of the specific embodiment are the preferred embodiments of the application, and do not limit the protection scope of the application, so that: any equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. A liquid-cooled module, characterized by: The utility model relates to a battery pack cooling device, including: A first liquid cooling panel (1) includes an internal flow channel (11), one end of which is formed into a liquid inlet (111), and the other end is formed into a liquid outlet (112); A heat-conducting pad (2) with elastic deformation capacity is laid on the surface of the first liquid cooling panel (1); A plurality of battery cells (3) are provided, and the plurality of battery cells (3) are arranged on the heat-conducting pad (2) in the direction of the surface of the first liquid cooling panel (1), and each battery cell (3) is provided with a temperature detection element; A limiting device (4) is connected to the first liquid cooling panel (1), and the limiting device (4) limits the plurality of battery cells (3) to be pressed against the heat-conducting pad (2); An adjustable heat dissipation device (6) can individually dissipate heat for any battery cell (3); A control module is connected to the adjustable heat dissipation device (6) and each temperature detection element, and the control module controls the operation of the adjustable heat dissipation device (6) in response to the detection signal of the temperature detection element; The adjustable heat dissipation device (6) includes a second liquid cooling panel (61), and a phase change heat absorption element (62) is mounted on the second liquid cooling panel (61) corresponding to each battery cell (3), the phase change heat absorption element (62) can move to contact the second liquid cooling panel (61) or the battery cell (3), and adjacent phase change heat absorption elements (62) are kept in contact to enable heat conduction between them; The second liquid cooling panel (61) is also provided with a position adjusting mechanism (63), which can make any phase change heat absorption element (62) contact the corresponding battery cell (3) and at least one phase change heat absorption element (62) contact the second liquid cooling panel (61).

2. The liquid-cooled module of claim 1, wherein: The position adjusting mechanism (63) includes a state switching assembly (631), each phase change heat absorption element (62) has an elastic buckle structure (632), each phase change heat absorption element (62) has a first state of contacting the battery cell (3) and a second state of contacting the second liquid cooling panel (61), and the elastic buckle structure (632) is used to keep the phase change heat absorption element (62) in the first state or the second state, and the state switching assembly (631) is used to switch the phase change heat absorption element (62) between the first state and the second state.

3. The liquid-cooled module of claim 2, wherein: The phase change heat absorption element (62) includes a guide column (622), the second liquid cooling panel (61) is provided with a guide hole (611), and the guide column (622) is slidably arranged in the guide hole (611); The elastic buckle structure (632) includes a clamping plate (6321), the clamping plate (6321) is connected to the guide column (622), the guide hole (611) is provided with a clamping groove (6111), and the clamping plate (6321) can be clamped into the clamping groove (6111) to keep the phase change heat absorption element (62) in the second state; The elastic buckle structure (632) further includes a pressing spring (6322), one end of the pressing spring (6322) is connected to the second liquid cooling panel (61), and the other end is connected to the phase change heat absorption element (62), when the clamping plate (6321) is not clamped in the clamping groove (6111), the pressing spring (6322) can keep the phase change heat absorption element (62) in the first state.

4. The liquid-cooled module of claim 3, wherein: The clamping plate (6321) comprises a horizontal plate portion (63211), a vertical plate portion (63212) and a clamping pin portion (63213) connected in sequence, the clamping pin portion (63213) is obliquely connected to the vertical plate portion (63212), the horizontal plate portion (63211), the vertical plate portion (63212) and the clamping pin portion (63213) all have elastic deformation capability, the horizontal plate portion (63211) is connected to the guide column (622), and the clamping pin portion (63213) is used for clamping into the clamping groove (6111).

5. The liquid-cooled module of claim 2, wherein: The state switching assembly (631) comprises a horizontal driving member (6311), the second liquid cooling plate (61) is provided with a mounting cavity (612) in communication with each clamping groove (6111), the horizontal driving member (6311) is mounted in the mounting cavity (612), the horizontal driving member (6311) is further connected with a telescopic member (6312), the telescopic member (6312) is connected with a pushing column (6313), the horizontal driving member (6311) is used for driving the pushing column (6313) to move to one side of any clamping plate (6321), and the telescopic member (6312) is used for driving the pushing column (6313) to move to push the clamping plate (6321) away from the clamping groove (6111) so that the phase change heat absorption member (62) moves from the second state to the first state. The limiting device (4) is provided with a driving assembly (64), the second liquid cooling plate (61) is connected to the driving assembly (64), and the driving assembly (64) can drive the second liquid cooling plate (61) to move, so that the phase change heat absorption member (62) moves from the first state to the second state.

6. The liquid-cooled module of claim 2, wherein: The limiting device (4) comprises a mounting plate (41) connected to the first liquid cooling plate (1), the mounting plate (41) is provided with a steel belt (42) in common around the plurality of battery cells (3), and the steel belt (42) presses the plurality of battery cells (3) against the heat-conducting pad (2).

7. The liquid-cooled module of any of claims 1-6, wherein: The heat-conducting pad (5) having elastic deformation capability is arranged between adjacent battery cells (3) and in contact with the heat-conducting pad (2).

8. The liquid-cooled module of any of claims 1-6, wherein: The first liquid cooling plate (1) comprises liquid cooling sub-plate one (12) and liquid cooling sub-plate two (13) connected in sequence, the flow channel (11) is formed between the liquid cooling sub-plate one (12) and the liquid cooling sub-plate two (13), and the liquid cooling sub-plate one (12) and the liquid cooling sub-plate two (13) can be separated to expose the flow channel (11).

9. The liquid-cooled module of any of claims 1-6, wherein: The plurality of battery cells (3) are divided into two groups, wherein the two groups of battery cells (3) are a first power supply group and a second power supply group, the first power supply group is located on one side of the heat-conducting pad (2), and the second power supply group is located on the other side of the heat-conducting pad (2).

10. A battery pack, characterized by: The battery pack comprises a box body (7) and a plurality of the liquid cooling modules according to claim 1, and the plurality of liquid cooling modules are mounted in the box body (7).

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