Thermal management battery system and new energy vehicles

Abstract

The embodiment of the present application provides a thermal management battery system and a new energy vehicle, the system includes a battery module and a thermal management device, the battery module includes at least one layer of sub-modules and at least one card plate group, each card plate group includes two card plates arranged opposite to each other, each card plate is provided with a card hole for fixing a single battery, and a plurality of bosses are arranged at intervals around each card hole, and each boss is provided with a first through hole; the thermal management device includes a sealed cavity for accommodating the battery module, the first end face of the sealed cavity is provided with at least one liquid inlet, the second end face is provided with a liquid outlet corresponding to the liquid inlet on the first end face, and the liquid inlet and the liquid outlet are connected through the first through hole. Through the above design, the liquid medium entering the sealed cavity can contact various areas of the battery module, and a better thermal management effect can be achieved.

Description

Technical Field

[0001] The present application relates to the field of power battery technology, and more specifically, to a thermal management battery system and a new energy vehicle. Background Art

[0002] With the increase in lithium battery energy density and the need for fast charging, the temperature control requirements for lithium batteries after forming battery modules are becoming increasingly strict. The thermal management methods in existing battery systems cannot meet the requirements. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a thermal management battery system and a new energy vehicle for performing thermal management on a battery module.

[0004] In order to achieve the above purpose, the embodiment of the present application adopts the following technical solution:

[0005] In a first aspect, an embodiment of the present application provides a thermal management battery system, comprising:

[0006] A battery module, the battery module comprising at least one card plate group and at least one layer of sub-modules, each card plate group comprising two card plates arranged opposite to each other, a receiving space for receiving at least one layer of sub-modules is formed between the two card plates; each layer of sub-modules comprises a plurality of single cells, the card plates are provided with a card hole for fixing the single cells and a plurality of bosses located around the card hole, each boss being provided with a first through hole;

[0007] A thermal management device, the thermal management device comprising a sealed cavity for accommodating a battery module, the sealed cavity comprising a first end face and a second end face arranged opposite to each other, the first end face being provided with at least one liquid inlet, the second end face being provided with a liquid outlet corresponding to the liquid inlet on the first end face, the liquid inlet being connected to the liquid outlet through a first through hole on the multiple bosses.

[0008] Optionally, in the above-mentioned thermal management battery system, at least two first positioning and connecting holes are provided on each card plate, and the first positioning and connecting holes on each card plate correspond to each other one by one. The corresponding first positioning and connecting holes are connected by a pull rod so that the first through holes on the bosses of each card plate are aligned one by one.

[0009] Optionally, in the above thermal management battery system, the battery module further includes:

[0010] A current collecting plate and a pole piece are arranged on both sides of each layer of sub-modules, and the current collecting plate and the pole piece are provided with a second through hole corresponding to the first through hole and a positioning hole located between two adjacent second through holes; and

[0011] An isolation plate is arranged between two adjacent layers of sub-modules, and a third through hole corresponding to the first through hole and a second positioning connection hole corresponding to the first positioning connection hole are formed on the isolation plate.

[0012] Optionally, in the above thermal management battery system, the liquid inlet is perpendicular or parallel to the first end surface, and the liquid outlet is perpendicular or parallel to the second end surface.

[0013] Optionally, in the above thermal management battery system, the thermal management device further comprises:

[0014] A liquid storage chamber provided in the circulation pipeline, the liquid storage chamber being used to store a heat-conducting insulating liquid;

[0015] A circulation pipeline is arranged outside the sealed cavity, the circulation pipeline is connected between the liquid inlet and the liquid outlet, and is used for the heat-conducting insulating liquid to flow; and

[0016] A circulation pump is used to provide power for the flow of the thermally conductive insulating liquid, driving the thermally conductive insulating liquid in the liquid storage chamber to flow along the circulation pipeline to the liquid inlet, enter the sealed chamber through the liquid inlet, flow along the first through hole on the multiple bosses to the liquid outlet, and return to the liquid storage chamber through the liquid outlet.

[0017] Optionally, in the above thermal management battery system, the thermal management device further comprises:

[0018] At least one temperature sensor is disposed in the battery module, and the at least one temperature sensor is used to detect the temperature of the battery module;

[0019] A control valve disposed in the circulation pipeline, the control valve is used to control the on-off of the circulation pipeline; and

[0020] A thermostat, the thermostat is electrically connected to the circulation pump, the control valve and the at least one temperature sensor, and is used to obtain the temperature value detected by the at least one temperature sensor, and when the temperature value reaches a preset value, control the control valve and the circulation pump to open.

[0021] Optionally, in the above-mentioned thermal management battery system, the temperature controller is also used to adjust the temperature of the heat-conducting insulating liquid flowing in the circulation pipeline.

[0022] Optionally, in the above thermal management battery system, the battery module further includes:

[0023] A scattering annular flow channel recessed into the interior of the sealed cavity is provided on one side of the first end face and / or the second end face facing the interior of the sealed cavity; the scattering annular flow channel is connected to the liquid inlet and / or the liquid outlet, so that the thermally conductive insulating liquid entering the sealed cavity is sprayed onto the first through hole on the multiple bosses.

[0024] Optionally, in the above-mentioned thermal management battery system, the scattering annular flow channel includes a plurality of annular flow channels with the center of the end face as the center of the circle, the plurality of annular flow channels are arranged at intervals, and every two adjacent annular flow channels are connected by a plurality of radial flow channels arranged at intervals;

[0025] A plurality of spray holes are arranged at intervals on each annular flow channel and each radial flow channel, so that the heat-conducting insulating liquid entering the sealing cavity is evenly sprayed to the first through holes on the plurality of bosses through the spray holes on the plurality of annular flow channels and the plurality of radial flow channels.

[0026] In a second aspect, an embodiment of the present application further provides a new energy vehicle, which includes the thermal management battery system provided in the first aspect of the embodiment of the present application, and the thermal management battery system is used to power the new energy vehicle.

[0027] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0028] The embodiment of the present application provides a thermal management battery system and a new energy vehicle, the system includes a battery module and a thermal management device, the battery module includes at least one layer of sub-modules and at least one card plate group, each card plate group includes two card plates arranged opposite to each other, each card plate is provided with a card hole for fixing a single battery, and a plurality of bosses are arranged at intervals around each card hole, and each boss is provided with a first through hole; the thermal management device includes a sealed cavity for accommodating the battery module, the first end face of the sealed cavity is provided with at least one liquid inlet, the second end face is provided with a liquid outlet corresponding to the liquid inlet on the first end face, and the liquid inlet and the liquid outlet are connected through the first through hole. Through the above design, the liquid medium entering the sealed cavity can contact with various areas of the battery module, and a better thermal management effect can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A connection diagram of a thermal management battery system provided in an embodiment of the present application;

[0031] Figure 2 Another connection diagram of the thermal management battery system provided in the embodiment of the present application;

[0032] Figure 3 A schematic diagram of disassembly of a sub-module provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a card board provided in an embodiment of the present application;

[0034] Figure 5 for Figure 4 A partial schematic diagram of the card board shown;

[0035] Figure 6 A schematic diagram of assembling a card board group and a single battery provided in an embodiment of the present application;

[0036] Figure 7 (a) is a schematic diagram of the structure of a current collecting plate provided in an embodiment of the present application;

[0037] Figure 7 (b) is a schematic diagram of the structure of a pole piece provided in an embodiment of the present application;

[0038] Figure 8 A schematic diagram of the structure of an isolation plate provided in an embodiment of the present application;

[0039] Fig. 9 A schematic diagram of the structure of a sealed cavity provided in an embodiment of the present application;

[0040] Fig.10 A schematic diagram of the flow direction of the thermally conductive insulating liquid provided in an embodiment of the present application;

[0041] Fig.11 (a) is a schematic structural diagram of another sealed cavity provided in an embodiment of the present application at a viewing angle;

[0042] Fig.11 (b) Fig.11 (a) Schematic diagram of the structure of the sealed chamber from another perspective;

[0043] Fig.12 A schematic diagram of the structure of a scattering annular flow channel provided in an embodiment of the present application.

[0044] Icons: 10- thermal management battery system; 100- battery module; 110- sub-module; 111- single cell; 200- thermal management device; 210- sealed chamber; 211- liquid inlet; 212- liquid outlet; 220- liquid storage chamber; 230- circulation pipeline; 240- circulation pump; 250- control valve; 260- temperature controller; 110- sub-module; 31, 32- card board; 311, 331- card hole; 31 2-boss; 3121-first through hole; 313, 314, 315, 316-first positioning and connecting holes; 33, 35-current collecting plate; 34, 36-pole piece; 332, 352-second through hole; 333, 353-positioning hole; 37-isolating plate; 371-third through hole; 372-second positioning and connecting hole; 41-annular flow channel; 42, 42a, 42b, 42c-radial flow channel; 43-injection hole. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0048] Research has found that in related technologies, battery systems are mainly thermally managed through air cooling and liquid cooling.

[0049] In the air cooling method, the heat generated in the battery module is mainly removed by natural wind, evaporator cold air, etc., but the air has a small specific heat capacity, the amount of heat that can be removed is limited, and the cooling capacity is insufficient. In addition, due to the different wind speeds in various parts of the battery module, the temperature difference between various areas in the battery module is large.

[0050] In the liquid cooling method, liquid cooling flat tubes are usually inserted between the sub-modules of each layer of the battery module, and coolant is then introduced into the liquid cooling flat tubes to cool the battery module. However, the contact areas between the liquid cooling flat tubes and each single battery in the battery module vary in size, resulting in uneven heat dissipation between various areas in the battery module. In addition, this method has complex grouping, high requirements on component processing accuracy, and too many connection points between the flat tubes and the main pipeline, resulting in a greater risk of leakage.

[0051] Based on this, an embodiment of the present application provides a thermal management battery system and a new energy vehicle to at least partially improve the above-mentioned problems, which will be elaborated in detail below.

[0052] Please refer to Figure 1 and Figure 2 The embodiment of the present application provides a thermal management battery system 10, the thermal management battery system 10 includes a battery module 100 and a thermal management device 200, the thermal management device 200 includes a sealed cavity 210 for accommodating the battery module 100, the sealed cavity 210 includes a first end face and a second end face that are oppositely arranged. The first end face is provided with at least one liquid inlet 211, and the second end face is provided with a liquid outlet 212 corresponding to the liquid inlet 211 on the first end face.

[0053] Optionally, the sealed cavity 210 may be made of any one or more of plastic, aluminum-plastic film, rubber film, metal material with an insulating layer, etc., so that the sealed cavity 210 is non-conductive, non-leaky, and has a certain pressure resistance.

[0054] In this embodiment, one, two or more liquid inlets 211 may be provided on the first end surface, and the number of liquid inlets 211 provided may be flexibly selected according to the size and shape of the cross-sectional area (usually the area of ​​the first end surface or the second end surface) of the battery module 100. In this embodiment, the liquid inlets 211 on the first end surface correspond to the liquid outlets 212 on the second end surface one by one. For example, when the first end surface includes one liquid inlet 211, the second end surface includes one liquid outlet 212 corresponding to the liquid inlet 211. Figure 1 The illustrated case is a case where only one liquid inlet 211 and one liquid outlet 212 are included; when the first end surface includes two liquid inlets 211, the second end surface includes two liquid outlets 212 corresponding to the two liquid inlets 211 respectively; when the first end surface includes three liquid inlets 211, the second end surface includes three liquid outlets 212 corresponding to the three liquid inlets 211 respectively. It is worth noting that Figure 2 The illustrated embodiment shows a situation where three liquid inlets 211 are provided on the first end surface and three liquid outlets 212 are provided on the second end surface.

[0055] In this embodiment, the battery module 100 includes at least one card board group and at least one layer of sub-modules 110 .

[0056] Please refer to Figure 3 , is an assembly diagram of a layer of a sub-module 110 provided in an embodiment of the present application. The sub-module 110 includes a plurality of single cells 111. It is worth noting that the first end face and the second end face of the sealed cavity are arranged relatively along the connection direction of the two electrodes of the single cell.

[0057] In this embodiment, each layer of sub-modules is fixed by a card plate group, and each card plate group includes two card plates arranged opposite to each other, such as Figure 3 The card plate 31 and the card plate 32 shown in FIG. Figure 3 The submodule 110 is shown for further explanation.

[0058] In one embodiment, a receiving space for receiving the sub-module 110 is formed between the card board 31 and the card board 32. In other embodiments, one card board set can also be used to fix two or more layers of sub-modules 110. In this case, the receiving control formed between the two card boards in the card board set is sufficient to receive the two or more layers of sub-modules 110.

[0059] In this embodiment, each is provided with a clamping hole for fixing the single battery 111 and a plurality of bosses located around the clamping hole, and each boss is provided with a first through hole. Figure 4 and Figure 5 , Figure 4 is a structural schematic diagram of a card board 31 provided in an embodiment of the present application, Figure 5 yes Figure 4 The schematic diagram of the clamping plate 31 is shown as a partial diagram. Taking the clamping plate 31 as an example, the clamping plate 31 is provided with clamping holes 311 corresponding to the plurality of single cells 111 and a plurality of bosses 312 located around each clamping hole 311 , and each boss 312 is provided with a first through hole 3121 .

[0060] In this embodiment, the structure of the card board 32 is the same as that of the card board 31, that is, the card board 32 is also provided with a card hole, a boss and a first through hole at a position corresponding to the card board 31. In detail, the card holes on the card board 31 and the card board 32 correspond one to one, and the two corresponding card holes are used to fix the same single battery. Correspondingly, the first through holes around the two corresponding card holes also correspond one to one. In implementation, the card board 31, the plurality of single batteries 11 and the card board 32 can be assembled as follows: Figure 6 The structure shown.

[0061] In this embodiment, the liquid inlet 211 on the first end surface of the sealed cavity is connected to the liquid outlet 212 on the second end surface through the first through holes 3121 on the plurality of bosses 312, and the liquid medium introduced into the liquid inlet 211 can reach the liquid outlet 212 along the first through holes 3121. During this process, the liquid medium can fully contact the single battery 111 of the battery module 100, thereby performing heat exchange with each single battery 111. In this way, by introducing a liquid medium of a specific temperature (low temperature or high temperature), the purpose of thermal management of the battery module 100 can be achieved.

[0062] The thermal management battery system provided in the embodiment of the present application can completely immerse each single cell in the battery module in the coolant (or heating liquid). Compared with the traditional air cooling system or liquid cooling system directly placed in the air, on the one hand, it can better block the thermal runaway of the single cell or the impact on the surrounding single cells; on the other hand, the liquid has a larger flow resistance and a higher specific heat capacity, which can more quickly reduce the speed of high-speed substances ejected from the single cell in thermal runaway, and can quickly absorb heat and conduct the absorbed heat away, thereby having better thermal runaway protection performance; on the other hand, the coolant (or heating liquid) directly contacts the battery cell for heat transfer, and the heat transfer efficiency is higher, so more single cells can be arranged in the battery module, that is, the energy density in the battery module is increased, and the contact area between each single cell and the coolant (or heating liquid) is the same, which can more evenly control the temperature of each single cell, and improve the consistency of the temperature of each single cell in the battery module.

[0063] Optionally, in the embodiment of the present application, the cooling liquid or heating liquid used may be a thermally conductive insulating liquid, such as silicone oil, fluorocarbon liquid, etc. The thermally conductive insulating liquid is odorless, non-toxic, non-volatile, low in viscosity, and stable in nature. Even if leakage occurs, it will not cause short circuit failure of the battery module, and is safer and more reliable.

[0064] In this embodiment, in order to ensure that the first through holes on each card are aligned, each card may be provided with at least two first positioning and connecting holes. The first positioning and connecting holes on each card correspond to each other, and the corresponding first positioning and connecting holes are connected by a tie rod. In this way, the first through holes on the bosses of each card can be aligned one by one.

[0065] Please refer back to Figure 4 The card plate 31 includes four sides, which are connected end to end to form a polygon with four vertices. In implementation, first positioning connection holes can be respectively opened at the four vertices, for example Figure 4 The first positioning connection hole 313, the first positioning connection hole 314, the first positioning connection hole 315 and the first positioning connection hole 316 in the embodiment. In other embodiments, only Figure 4Any two of the four positioning connection holes shown in the figure are not limited in this embodiment.

[0066] In this embodiment, the positions and shapes of the first positioning and connecting holes provided on other card boards are consistent with those on the card board 31 , and are not described in detail herein.

[0067] It is worth pointing out here that Figure 4 The shape of the card board 31 shown in the figure is only an example, and the shape of the card board in the battery module can be flexibly set according to actual needs, for example, it can be a rectangle.

[0068] Please refer back to Figure 3 , current collecting plates and pole pieces may also be provided on both sides of each layer of sub-modules, for example Figure 3 The current collecting plate 33, the current collecting plate 34, the pole piece 35 and the pole piece 36 in the submodule 110 are provided. The current collecting plate 33 and the pole piece 35 are sequentially arranged on the side of the card board 31 away from the multiple single cells 111, and the current collecting plate 34 and the pole piece 36 are sequentially arranged on the side of the card board 32 away from the multiple single cells 111. In this embodiment, the pole piece 35 is used to collect the current of the single cells 111 in the submodule 110 onto the current collecting plate 35, and the pole piece 36 is used to collect the current of the single cells 111 in the submodule 110 onto the current collecting plate 34. In addition, the pole pieces 35 and 36 can also act as fuses.

[0069] In this embodiment, Figure 7 Taking the current collecting plate 33 shown in (a) as an example, the current collecting plate 33 is provided with a second through hole 332 corresponding to the first through hole 3121 and a positioning hole 333 located between two adjacent second through holes 332. In detail, the current collecting plate 33 includes the clamping holes 331 corresponding to the plurality of single cells 111. Taking the clamping plate 31 as an example, since the first through hole 3121 on the clamping plate 31 is arranged on the peripheral side of the clamping hole 311, and the second through holes 332 on the current collecting plate 33 correspond to the first through holes 3121 one by one, the second through holes 332 on the current collecting plate 33 are also distributed on the peripheral side of each clamping hole 331. A positioning hole 333 is arranged between at least some of the adjacent second through holes 332 on the current collecting plate 33. The structures of other current collecting plates in this embodiment are similar to those of the current collecting plate 33, and will not be described in detail here.

[0070] by Figure 7Taking the pole piece 35 shown in (b) as an example, the pole piece 35 is provided with a second through hole 352 corresponding to the first through hole 3121 and a positioning hole 353 located between two adjacent second through holes 352. In detail, the pole piece 35 includes the clamping holes 351 corresponding to the plurality of single cells 111. Taking the card board 31 as an example, since the first through hole 3121 on the card board 31 is arranged on the peripheral side of the clamping hole 311, and the second through hole 352 on the pole piece 35 corresponds to the first through hole 3121 on each card board (such as the card board 31) one by one, the second through holes 352 on the pole piece 35 are also distributed on the peripheral side of each clamping hole 351. A positioning hole 353 is provided between at least some of the adjacent second through holes 352 on the pole piece 35. The structures of other pole pieces in this embodiment are similar to those of the pole piece 35, and will not be repeated here.

[0071] Through the above arrangement, during implementation, the corresponding positioning holes on each current collecting plate and each pole piece can be connected together, thereby ensuring that the first through hole on the card is aligned with the second through hole on the current collecting plate and the pole piece, so that the thermally conductive insulating liquid can flow to various areas of the battery module and then fill the entire battery module.

[0072] Please refer back to Figure 3 In the battery module, an isolation plate 37 is further provided between two adjacent sub-modules to isolate and insulate the two adjacent sub-modules 110 to avoid short circuit.

[0073] Please refer to Figure 8 , which shows a detailed structural schematic diagram of the isolation plate 37, the isolation plate 37 may be provided with a third through hole 371 corresponding to the first through hole 3121 on the card plate (e.g., the card plate 31) and a second positioning connection hole 372 corresponding to the first positioning connection hole 313 on the card plate (e.g., the card plate 31). In this embodiment, the third through hole 371 on the isolation plate 37 is aligned one by one with the first through hole on each card plate, and the second positioning connection hole 372 on the isolation plate 37 is aligned one by one with the second positioning connection hole on each card plate. The first positioning connection hole and the second positioning connection hole that are aligned with each other may be connected by a tie rod.

[0074] In practical applications, the placement direction of the battery module 100 may be different. For example, it can be placed along the connection direction of the two electrodes of the single battery 111 (hereinafter referred to as the "first direction"), or it can be placed in a direction perpendicular to the connection direction (hereinafter referred to as the "second direction").

[0075] When the battery module 100 is placed along the first direction, in order to save space, the liquid inlet 211 can be set to be parallel to the first end surface, and the liquid outlet 212 can be set to be parallel to the second end surface. Fig. 9As shown, the liquid inlet 211 of the sealed cavity 210 is flatly laid on the first end surface, and the liquid outlet 212 is flatly laid on the second end surface. In addition, when the battery module 100 is placed along the first direction, the thermally conductive insulating liquid can flow quickly and evenly through various places in the battery module 100 by virtue of gravity. In detail, in this case, the flow direction of the thermally conductive insulating liquid can be as follows: Fig.10 As indicated by the arrow in .

[0076] When the battery module 100 is placed along the second direction, the liquid inlet 211 can be set to be perpendicular to the first end surface, and the liquid outlet 212 can also be set to be perpendicular to the second end surface. Fig.11 (a) and Fig.11 (b) shows the sealed cavity 210 at different viewing angles. Fig.11 As shown in (a), the liquid inlet 211 of the sealed cavity 210 is a cylindrical structure perpendicular to the first end surface, as shown in FIG. Fig.11 As shown in (b), the liquid outlet 212 of the sealed cavity 210 is a cylindrical structure perpendicular to the second end surface.

[0077] Please refer back to Figure 1 and Figure 2 In this embodiment, the thermal management device 200 may further include a liquid storage chamber 220, a circulation pipe 230, and a circulation pump 240. The circulation pipe 230 is connected between the liquid inlet 211 and the liquid outlet 212 for the liquid medium to flow. In implementation, the number of branches at both ends of the circulation pipe 230 is different according to the number of liquid inlets 211 and liquid outlets 212 included in the sealed chamber 210. For example Figure 1 In the scenario shown in the figure, the sealed cavity 210 includes three liquid inlets 211 and three liquid outlets 212. Correspondingly, the two ends of the circulation pipe 230 include three branches respectively, wherein the three branches at one end are connected to the three liquid inlets 211 respectively, and the three branches at the other end are connected to the three liquid outlets 212 respectively.

[0078] The liquid storage chamber 220 and the circulation pump 240 are both arranged on the circulation pipe 230, wherein the liquid storage chamber 220 is used to store the heat-conducting insulating liquid and to provide the heat-conducting insulating liquid to the circulation pipe 230; the circulation pump 240 is used to provide power for the flow of the heat-conducting insulating liquid, in other words, to drive the heat-conducting insulating liquid in the liquid storage chamber 220 into the circulation pipe 230, and make it flow along the circulation pipe 230 to the liquid inlet, enter the sealing chamber 210 through the liquid inlet, arrive at the liquid outlet 212 along the first through holes on the multiple bosses, the current collecting plate and the second through holes on the pole piece, and return to the liquid storage chamber 220 from the liquid outlet 212.

[0079] Optionally, the thermal management device 200 may further include a control valve 250, a thermostat 260 and at least one temperature sensor (not shown in the figure), wherein the control valve 250, the circulation pump 240 and the at least one temperature sensor are all electrically connected to the thermostat 260. The at least one temperature sensor is arranged in the battery module 100 to detect the temperature of the battery module 100. The control valve 250 is arranged in the circulation pipe 230 to control the on-off of the circulation pipe 230. The thermostat 260 is used to obtain the temperature value detected by the at least one temperature sensor, and when the temperature value reaches a preset value, the control valve 250 and the circulation pump 240 are controlled to open. In this way, the heat-conducting insulating liquid in the liquid storage chamber 220 can be driven into the sealed chamber 210 to soak the battery module 100 so as to perform thermal management on the battery module 100.

[0080] Optionally, the temperature controller 260 may also be used to adjust the temperature of the heat-conducting insulating liquid flowing in the circulation pipe 230 , thereby cooling or heating the battery module 100 as required.

[0081] Optionally, in the embodiment of the present application, in order to allow the heat-conducting insulating liquid entering the sealed cavity 210 to enter each first through hole more evenly, a scattering annular flow channel may be provided on a side of the first end surface facing the inside of the sealed cavity 210, and the scattering annular flow channel is recessed toward the inside of the sealed cavity 210 and communicated with the liquid inlet. The heat-conducting insulating liquid entering from the liquid inlet 211 may be sprayed to each first through hole through the scattering annular flow channel, thereby evenly entering various places of the sealed cavity 210.

[0082] Correspondingly, the scattering annular flow channel can be provided on a side of the second end surface facing the interior of the sealed cavity 210 , so that the thermally conductive insulating liquid in the sealed cavity 210 can quickly flow along the scattering annular flow channel to the liquid outlet 212 , and then leave from the liquid outlet 212 .

[0083] Combine the following Fig.12 , the structure of the scattering annular flow channel 40 provided on the first end surface facing the inside of the sealed cavity 210 is described in detail. It is worth noting that, Fig. 9 It is a schematic diagram of the scattering annular flow channel 40 when the cross section of the battery module 100 is rectangular.

[0084] The scattering annular flow channel 40 includes a plurality of annular flow channels 41 with the center of the end face as the center of the circle, the plurality of annular flow channels 41 are arranged at intervals, and each two adjacent annular flow channels 41 are connected by a plurality of radial flow channels 42 arranged at intervals. Among them, there may be a plurality of collinear radial flow channels 42 in each radial flow channel 42 arranged in the direction from the center to the edge of the end face, for example Figure 8The radial flow channels 42a, 42b and 42c are collinear.

[0085] The different scattering annular flow channels are located at different end surfaces, which may be the first end surface or the second end surface, for example Fig.12 The end surface where the scattering annular flow channel 40 is shown is the first end surface.

[0086] In this embodiment, a plurality of injection holes 43 are arranged at intervals on each annular flow channel 41 and each radial flow channel 42, wherein the injection holes 43 can be arranged at the bottom of the scattering annular flow channel 40. The heat-conductive insulating liquid entering the sealed cavity 210 can be evenly sprayed to each first through hole through the injection holes 43 on the plurality of annular flow channels 41 and the plurality of radial flow channels 42, and then evenly reaches each area of ​​the battery module 100.

[0087] An embodiment of the present application also provides a new energy vehicle, which includes a thermal management battery system provided in an embodiment of the present application, and the thermal management battery system is used to power the new energy vehicle.

[0088] In summary, the embodiment of the present application provides a thermal management battery system and a new energy vehicle, the system includes a battery module and a thermal management device, the battery module includes at least one layer of sub-modules and at least one card plate group, each card plate group includes two card plates arranged opposite to each other, each card plate is provided with a card hole for fixing a single battery, and a plurality of bosses are arranged at intervals around each card hole, and each boss is provided with a first through hole; the thermal management device includes a sealed cavity for accommodating the battery module, the first end face of the sealed cavity is provided with at least one liquid inlet, and the second end face is provided with a liquid outlet corresponding to the liquid inlet on the first end face, and the liquid inlet and the liquid outlet are connected through the first through hole. Through the above design, the liquid medium entering the sealed cavity can contact various areas of the battery module, and a better thermal management effect can be achieved.

[0089] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0090] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0091] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0092] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A thermal management battery system, characterized in that: include: A battery module, wherein the battery module comprises at least one card plate group and at least one layer of sub-modules, each card plate group comprises two card plates arranged opposite to each other, and a storage space for accommodating at least one layer of sub-modules is formed between the two card plates; each layer of sub-modules comprises a plurality of single cells, and the card plates are provided with a card hole for fixing the single cells and a plurality of bosses located around the card hole, and each boss is provided with a first through hole; each card plate is provided with at least two first positioning and connecting holes, and the first positioning and connecting holes on each card plate correspond to each other one by one, and the corresponding first positioning and connecting holes are connected by a pull rod, so that the first through holes on the bosses of each card plate are aligned one by one; the battery module is placed along a first direction, and the first direction is the connection direction of two electrodes of the single cells in the battery module; A thermal management device, the thermal management device includes a sealed cavity for accommodating a battery module, the sealed cavity includes a first end face and a second end face arranged oppositely, the first end face is provided with at least one liquid inlet, the second end face is provided with a liquid outlet corresponding to the liquid inlet on the first end face, the liquid inlet is connected to the liquid outlet through the first through hole on the multiple bosses; the first end face and the second end face are arranged oppositely along the connection direction of the two electrodes of the single battery; the liquid inlet is perpendicular or parallel to the first end face, and the liquid outlet is perpendicular or parallel to the second end face; the heat-conducting insulating liquid can flow quickly and evenly through various places in the battery module with the help of gravity.

2. The thermal management battery system according to claim 1, characterized in that: The battery module also includes: A current collecting plate and a pole piece are arranged on both sides of each layer of sub-modules, and the current collecting plate and the pole piece are provided with a second through hole corresponding to the first through hole and a positioning hole located between two adjacent second through holes; and An isolation plate is arranged between two adjacent layers of sub-modules, and a third through hole corresponding to the first through hole and a second positioning connection hole corresponding to the first positioning connection hole are formed on the isolation plate.

3. The thermal management battery system according to claim 1 or 2, characterized in that: The thermal management device further comprises: A circulation pipeline is arranged outside the sealed cavity, the circulation pipeline is connected between the liquid inlet and the liquid outlet, and is used for the heat-conducting insulating liquid to flow; A liquid storage chamber provided in the circulation pipeline, the liquid storage chamber being used to store a heat-conducting insulating liquid; as well as A circulation pump is used to provide power for the flow of the thermally conductive insulating liquid, driving the thermally conductive insulating liquid in the liquid storage chamber to flow along the circulation pipeline to the liquid inlet, enter the sealed chamber through the liquid inlet, flow along the first through hole on the multiple bosses to the liquid outlet, and return to the liquid storage chamber through the liquid outlet.

4. The thermal management battery system according to claim 3, characterized in that: The thermal management device further comprises: At least one temperature sensor is disposed in the battery module, and the at least one temperature sensor is used to detect the temperature of the battery module; A control valve disposed in the circulation pipeline, the control valve is used to control the on-off of the circulation pipeline; and A thermostat, the thermostat is electrically connected to the circulation pump, the control valve and the at least one temperature sensor, and is used to obtain the temperature value detected by the at least one temperature sensor, and when the temperature value reaches a preset value, control the control valve and the circulation pump to open.

5. The battery system according to claim 4, characterized in that: The temperature controller is also used to adjust the temperature of the heat-conducting insulating liquid flowing in the circulation pipeline.

6. The battery system according to claim 3, characterized in that: The battery module also includes: A scattering annular flow channel recessed into the interior of the sealed cavity is provided on one side of the first end face and / or the second end face facing the interior of the sealed cavity; the scattering annular flow channel is connected to the liquid inlet and / or the liquid outlet, so that the thermally conductive insulating liquid entering the sealed cavity is sprayed onto the first through hole on the multiple bosses.

7. The battery system according to claim 6, characterized in that: The scattering annular flow channel comprises a plurality of annular flow channels with the center of the end surface as the center of the circle, the plurality of annular flow channels are arranged at intervals, and every two adjacent annular flow channels are connected through a plurality of radial flow channels arranged at intervals; A plurality of spray holes are arranged at intervals on each annular flow channel and each radial flow channel, so that the heat-conducting insulating liquid entering the sealing cavity is evenly sprayed to the first through holes on the plurality of bosses through the spray holes on the plurality of annular flow channels and the plurality of radial flow channels.

8. A new energy vehicle, characterized in that: The new energy vehicle comprises the thermal management battery system according to any one of claims 1 to 7, and the thermal management battery system is used to power the new energy vehicle.

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