CN221126054U - Battery module - Google Patents

Abstract

The application relates to a battery module, comprising: the battery cells are at least provided with two battery cells, and pole pieces are arranged on the battery cells; the long copper bar is connected with the pole piece and electrically connects at least two battery cores; the liquid cooling plate is internally provided with cooling liquid in a circulating way, and the battery cell is abutted against the liquid cooling plate; a phase change body which is coated on at least a part of the long copper bar and absorbs heat of the long copper bar or releases heat to the long copper bar through phase change; and the two ends of the heat conduction piece extend into the liquid cooling plate and the phase change body respectively, and heat is conducted to the liquid cooling plate through the phase change body. According to the application, the battery core is abutted against the liquid cooling plate, so that the battery core can be effectively cooled; and through setting up the phase change body on long copper bar, and set up the heat conduction spare between phase change body and liquid cooling board, can also make long copper bar's heat in proper order via the phase change body absorb the back, transmit to the liquid cooling board through the heat conduction spare, and take away by the coolant liquid, and then can ensure simultaneously that carries out effectual cooling to long copper bar.

Description

Battery module

Technical Field

The application relates to the technical field of power supply devices, in particular to a battery module.

Background

With the development and popularization of the fast charging technology of the battery module, higher requirements are put forward on the high temperature resistance of the copper bars of the battery module, especially for the long copper bars of the battery module. The long copper bar of the battery module can obviously raise the temperature due to relatively large resistance in the quick charge process, and particularly when the temperature of the long copper bar exceeds a safety threshold value, the normal operation of the battery module can be influenced when the battery module is in a high-temperature environment. Although the battery module in the prior art has a cooling mode of air cooling, liquid cooling or a combination of the air cooling and the liquid cooling, the cooling effect of the battery module is relatively poor for long copper bars, and the battery module is insufficient.

Disclosure of utility model

Based on the above, the application provides a battery module to solve the problem of poor cooling effect of long copper bars of the battery module in the prior art.

The application provides a battery module, comprising:

the battery cells are at least provided with two battery cells, and pole pieces are arranged on the battery cells;

The long copper bar is connected with the pole piece and electrically connects at least two battery cores;

the liquid cooling plate is internally provided with cooling liquid in a circulating way, and the battery cell is abutted against the liquid cooling plate;

A phase change body which is coated on at least a part of the long copper bar and absorbs heat of the long copper bar or releases heat to the long copper bar through phase change;

And the two ends of the heat conduction piece extend into the liquid cooling plate and the phase change body respectively, and conduct heat from the phase change body to the liquid cooling plate.

In one embodiment, the heat conducting member is a heat pipe and includes a condensation section and an evaporation section, the evaporation section extends into the phase change body, and the condensation section extends into the liquid cooling plate.

In one embodiment, the phase change body comprises an insulating layer, a phase change material and a shell, wherein the insulating layer is coated on the long copper bar, the shell is sleeved on the insulating layer, and the phase change material is arranged in the shell.

In one embodiment, the phase change material is a paraffin expanded graphite composite phase change material.

In one embodiment, the liquid cooling plate comprises a liquid cooling lower plate and a liquid cooling upper plate, a liquid cooling runner is arranged on one side of the top of the liquid cooling lower plate, the liquid cooling upper plate and the liquid cooling lower plate are arranged in an involution mode, the battery cell is arranged on the liquid cooling upper plate, an inlet water nozzle and an outlet water nozzle which are communicated with the liquid cooling runner are arranged on the liquid cooling upper plate or the liquid cooling lower plate, and cooling liquid enters the liquid cooling runner from the inlet water nozzle and is discharged from the outlet water nozzle.

In one embodiment, the liquid cooling upper plate is provided with a cooling groove, the cooling groove is communicated with the liquid cooling runner, one end of the heat conduction piece extends into the cooling groove, and an interlayer is arranged between the inner side wall of the cooling groove and the heat conduction piece.

In one embodiment, the barrier layer is a thermally conductive structural adhesive.

In one embodiment, the extending direction of the liquid cooling runner includes a first direction and a second direction, the first direction is perpendicular to the second direction, and one side of the bottom of the battery cell contacts with the liquid cooling upper plate.

In one embodiment, the phase change body is horizontally disposed along the first direction or the second direction, and the heat conduction member is vertically disposed between the phase change body and the liquid cooling plate.

In one embodiment, the battery module further includes a separator disposed between adjacent two of the electric cells.

According to the application, the liquid cooling plate is arranged, and the battery cell is abutted against the liquid cooling plate, so that the battery cell can be effectively cooled; and through setting up the phase change body on long copper bar, and set up the heat conduction spare between phase change body and liquid cooling board, can also make long copper bar's heat in proper order via the phase change body absorb the back, transmit to the liquid cooling board through the heat conduction spare, and take away by the coolant liquid, and then can ensure simultaneously that carries out effectual cooling to long copper bar.

Drawings

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present application;

Fig. 2 is a schematic view of a battery module according to an embodiment of the present application in a longitudinal direction at a heat transfer member;

Fig. 3 is an exploded view of a battery module according to an embodiment of the present application.

Reference numerals: 100. a battery cell; 110. a pole piece; 200. a long copper bar; 300. a liquid cooling plate; 310. a liquid-cooled lower plate; 320. a liquid-cooled upper plate; 330. a liquid cooling runner; 340. a water inlet tap; 350. an outlet water nozzle; 360. a cooling groove; 400. a phase variant; 410. an insulating layer; 420. a phase change material; 430. a housing; 500. a heat conductive member; 510. a condensing section; 520. an evaporation section; 530. an insulation section; 600. short copper bars; 700. an interlayer; 800. a partition board.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be noted that the illustrations provided in the present embodiment are merely schematic illustrations of the basic idea of the present utility model.

The structures, proportions, sizes, etc. shown in the drawings attached hereto are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are particularly adapted to the specific details of construction and the use of the utility model, without departing from the spirit or essential characteristics thereof, which fall within the scope of the utility model as defined by the appended claims.

References in this specification to orientations or positional relationships as "upper", "lower", "left", "right", "intermediate", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc., are based on the orientation or positional relationships shown in the drawings, are also for convenience of description only, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present application provides a battery module, as shown in fig. 1 to 3, comprising:

The battery cells 100 are at least two, and pole pieces 110 are arranged on the battery cells 100;

A long copper bar 200 connected with the pole piece 110 and electrically connecting at least two battery cells 100;

a liquid cooling plate 300 in which a cooling liquid is circulated, and the battery cell 100 is in contact with the liquid cooling plate 300;

A phase change body 400 which is coated on at least a part of the long copper bar 200 and absorbs heat of the long copper bar 200 or releases heat to the long copper bar 200 through phase change;

The heat conduction member 500 has both ends respectively extending into the liquid cooling plate 300 and the phase change body 400, and conducts heat from the phase change body 400 to the liquid cooling plate 300.

As shown in fig. 1, in the present embodiment, it is exemplarily illustrated that the battery cell 100 is a power supply unit of a battery module, which is provided with a post, and the pole piece 110 may be welded and fixed with the post while being electrically connected. The long copper bar 200 may overlap the pole piece 110, and specifically may be fixedly connected, such as welded, or detachably connected, such as by a screw connection. The long copper bar 200 electrically connects at least two electric cells 100 to realize series connection or parallel connection between the electric cells 100, for example, the long copper bar 200 may connect two electric cells 100 in series, connect two electric cells 100 in parallel, or connect two electric cells 100 in series and then connect one electric cell 100 in parallel. Specifically, the number of the long copper bars 200 may be plural, and the selection may be appropriately performed according to actual needs. The "long" of the long copper bar 200 should be understood as: the long copper bar 200 has a relatively long extending path when at least two electric cores 100 are electrically connected, and the poles of the two electric cores 100 are not adjacent to each other. In contrast, when the poles of the two cells 100 are adjacent, electrical connection may be performed through the short copper bars 600.

As shown in fig. 1, when the battery module is operating normally, the battery cell 100 generates heat, and the heat is transferred to the long copper bar 200 through the pole piece 110, and the long copper bar 200 has a temperature rise phenomenon. The phase change body 400 is used for absorbing heat of the long copper bar 200 when the temperature of the long copper bar 200 is increased, and is coated on the long copper bar 200, and at least part of the long copper bar 200 is coated, so as to realize local cooling of the long copper bar 200. The phase change body 400 may produce a phase change, in particular it may be a change from a solid phase to a liquid phase to absorb heat and a change from a liquid phase to a solid phase to release heat. Therefore, when the temperature of the long copper bar 200 increases and is higher than the phase transition temperature of the phase transition body 400, the phase transition body 400 can absorb heat to cool the long copper bar 200 by changing from solid phase to liquid phase; conversely, when the temperature of the long copper bar 200 is lowered below the phase transition temperature, the phase transition body 400 may also release heat to the long copper bar 200 by changing from a liquid phase to a solid phase.

When the battery cell 100 generates heat, the battery cell 100 can be cooled by the liquid cooling plate 300. The liquid cooling plate 300 is abutted against the plurality of battery cells 100, and when the cooling liquid circulates in the liquid cooling plate 300, the cooling liquid can take away the heat of the battery cells 100 in a heat transfer mode so as to complete the process of cooling the battery cells 100. The coolant in the liquid cooling plate 300 may be water, for example, when the battery module is used for a new energy vehicle, the coolant may be cooling water of an engine; the cooling liquid in the liquid cooling plate 300 may also be a specially prepared solution, which may be stored in a storage device and supplied to the liquid cooling plate 300 by pumping.

As shown in fig. 1, when the phase change body 400 is completely changed from the solid phase to the liquid phase, it stops absorbing heat because it cannot continue to generate phase change; in other words, the phase change body 400 has an endothermic limit. In order to avoid this phenomenon, a heat conduction member 500 is further disposed between the liquid cooling plate 300 and the phase change body 400, and two ends of the heat conduction member 500 extend into the liquid cooling plate 300 and the phase change body 400, respectively, so as to establish a "bridge" for heat transfer between the liquid cooling plate 300 and the phase change body 400. The heat conduction member 500 can further transfer the heat of the phase change body 400 to the liquid cooling plate 300, so as to avoid the phase change body 400 reaching the heat absorption limit of the phase change body, and further enable the phase change body 400 to continuously perform heat absorption cooling on the long copper bar 200, so as to achieve the purpose of continuously performing cooling on the long copper bar 200.

In summary, according to the application, by arranging the liquid cooling plate 300 and abutting the battery cell 100 against the liquid cooling plate 300, the battery cell 100 can be effectively cooled; and through setting up the phase change body 400 on long copper bar 200, and set up heat conduction spare 500 between phase change body 400 and liquid cooling board 300, can also make long copper bar 200's heat transfer to liquid cooling board 300 through heat conduction spare 500 after absorbing through phase change body 400 in proper order, and take away by the coolant liquid, and then can ensure simultaneously that carries out effectual cooling to long copper bar 200.

Specifically, the heat conduction member 500 is a heat pipe, and includes a condensation section 510 and an evaporation section 520, the evaporation section 520 extends into the phase change body 400, and the condensation section 510 extends into the liquid cooling plate 300.

As shown in fig. 1 and 2, in the present embodiment, it is exemplarily illustrated that a heat pipe is a high efficiency heat transfer device, which may be provided in a square pipe shape, and may be divided into an insulating section 530 located at the middle, and an evaporation section 520 and a condensation section 510 provided at both ends of the insulating section 530. It should be understood that when the heat conductive member 500 is a heat pipe, the evaporation section 520 and the condensation section 510 are disposed at two ends of the heat conductive member 500. When the phase change body 400 absorbs heat to the long copper bar 200 through phase change, the evaporation section 520 of the heat pipe stretches into the phase change body 400, so that the heat absorbed by the phase change body 400 can be transferred to the liquid phase working medium in the heat pipe, and the liquid phase working medium absorbs vaporization potential heat to be steam after being heated; since the vapor pressure of the evaporation stage 520 is higher than that of the condensation stage 510, a pressure difference is formed between both ends, and the pressure difference drives the vapor from the evaporation stage 520 to the condensation stage 510, and the vapor releases latent heat of vaporization when the condensation stage 510 condenses; after the liquid phase working medium condenses, it is again pumped back to the evaporator section 520 to complete a heat transfer cycle. Since the condensation section 510 of the heat pipe extends into the liquid cooling plate 300, the heat can be further transferred to the liquid cooling plate 300 and carried away by the cooling liquid.

Of course, in some embodiments, the heat conductive member 500 may also be configured as a rod made of a metal material with a high thermal conductivity, such as a copper rod, an iron rod, or an aluminum alloy rod.

It can be appreciated that, in this embodiment, by setting the heat conducting member 500 as a heat pipe, heat energy can be efficiently transferred from the evaporation section 520 to the condensation section 510 thereof, so that not only can heat absorbed by the phase change body 400 be further transferred to the liquid cooling plate 300, but also the phase change body 400 can continuously cool the long copper bar 200, and the cooling effect of the long copper bar 200 can be ensured.

Specifically, the phase change body 400 includes an insulating layer 410, a phase change material 420 and a shell 430, the insulating layer 410 is coated on the long copper bar 200, the shell 430 is sleeved on the insulating layer 410, and the phase change material 420 is disposed in the shell 430.

In the present embodiment, it is exemplarily illustrated that the phase change material 420 is used to generate a phase change to cool down the long copper bar 200 when the temperature thereof increases. Housing 430 is used to store phase change material 420 so that it completes the phase change. The housing 430 may be made of a metal material with a high thermal conductivity so that the phase change material 420 may absorb heat to the long copper bar 200 better. The insulating layer 410 may be made of an insulating material, such as insulating silica gel with a high thermal conductivity, and may cover the long copper bar 200 to insulate the long copper bar 200 from the phase change material 420 and the housing 430. The case 430 may be provided as only one layer, the phase change material 420 is provided between the inner sidewall of the case 430 and the insulating layer 410, and the insulating layer 410 is directly in contact with the phase change material 420.

Of course, in some embodiments, the outer shell 430 may also include an outer shell and an inner shell, and the phase change material 420 may be disposed in a space defined by the outer shell and the inner shell. The long copper bar 200 may pass through the inner shell, and the insulating layer 410 abuts against the inner shell.

It can be appreciated that, in this embodiment, through reasonable arrangement of the structure of the phase-change body 400, the phenomenon that the long copper bar 200 is shorted at the phase-change body 400 is avoided, and meanwhile, the phase-change body 400 can effectively absorb heat of the long copper bar 200, so as to ensure the cooling effect of the long copper bar 200.

More specifically, phase change material 420 is a paraffin expanded graphite composite phase change material.

As shown in fig. 2, in this embodiment, it is exemplarily illustrated that, when the phase change material 420 is a paraffin expanded graphite composite phase change material, the phase change temperature is low, and the optimum operating temperature range of the battery module can be adapted: 15 to 35 ℃. Meanwhile, by adjusting the components, the phase change temperature can be adjusted in a small range so as to meet the optimal working temperature range of different types of battery cells 100. Moreover, the device has the advantage of large latent heat, and has stronger constant temperature capability when cooling down. Furthermore, the insulating property is good, and the insulating leakage risk can be reduced.

Specifically, the liquid cooling plate 300 includes a liquid cooling lower plate 310 and a liquid cooling upper plate 320, a liquid cooling flow channel 330 is provided on one side of the top of the liquid cooling lower plate 310, the liquid cooling upper plate 320 and the liquid cooling lower plate 310 are arranged in a butt joint manner, the battery cell 100 is arranged on the liquid cooling upper plate 320, an inlet water nozzle 340 and an outlet water nozzle 350 which are communicated with the liquid cooling flow channel 330 are arranged on the liquid cooling upper plate 320 or the liquid cooling lower plate 310, and cooling liquid enters the liquid cooling flow channel 330 from the inlet water nozzle 340 and is discharged from the outlet water nozzle 350.

As shown in fig. 1 and 3, in the present embodiment, it is exemplarily illustrated that the liquid-cooled lower plate 310 and the liquid-cooled upper plate 320 may each be provided in a rectangular shape, and the length and width of the liquid-cooled lower plate 310 may be substantially equal to the length and width of the liquid-cooled upper plate 320. The liquid cooling channel 330 may be opened on the liquid cooling lower plate 310 from top to bottom, i.e. the liquid cooling oil channel has an upward opening. The liquid-cooled upper plate 320 and the liquid-cooled lower plate 310 are disposed in a butt joint, and can be detachably connected, for example, by bolts, buckles, or the like. The joint of the liquid cooling upper plate 320 and the liquid cooling lower plate 310 may be further provided with sealing structures such as a sealing ring and a sealing gasket, so as to avoid leakage of the cooling liquid. The inlet tap 340 and the outlet tap 350 may each be provided in a tubular shape and each communicate with the liquid cooling flow path 330 to introduce or discharge the cooling liquid into the liquid cooling flow path 330. In this embodiment, the inlet water nozzle 340 and the outlet water nozzle 350 are disposed on one side of the top of the liquid cooling upper plate 320, and may be perpendicular to the liquid cooling upper plate 320 and disposed at the same end of the liquid cooling upper plate 320 in the longitudinal direction. Of course, in some embodiments, the inlet water nozzle 340 and the outlet water nozzle 350 may also be provided on the liquid cooled lower plate 310.

It can be appreciated that, in this embodiment, through the reasonable arrangement of the structure of the liquid cooling plate 300, the cooling liquid circulates in the liquid cooling plate 300, so that the liquid cooling plate 300 is convenient for cooling the battery cell 100, and the liquid cooling plate 300 is convenient for absorbing the heat absorbed by the phase change body 400, so that the phase change body 400 can continuously cool the long copper bar 200.

More specifically, the liquid cooling upper plate 320 is provided with a cooling groove 360, the cooling groove 360 is communicated with the liquid cooling flow channel 330, one end of the heat conducting member 500 extends into the cooling groove 360, and the liquid cooling upper plate 320 is provided with a partition layer 700 between the inner side wall of the cooling groove 360 and the heat conducting member 500.

As shown in fig. 2 and 3, in the present embodiment, illustratively, the cooling groove 360 may vertically penetrate the liquid-cooled upper plate 320 to communicate with the liquid-cooled runner 330. The cooling groove 360 may be rectangular in shape to fit the shape of the cross section of the heat pipe. The length of the cooling groove 360 may be slightly greater than the length of the heat pipe, and the width of the cooling groove 360 may be slightly greater than the width of the heat pipe. When the end of the heat conduction member 500 passes through the cooling groove 360 and protrudes into the liquid cooling flow passage 330, a gap exists between the heat conduction member 500 and the inner side wall of the liquid cooling upper plate 320 at the cooling groove 360. The spacer 700 fills the gap and spaces the heat conductor 500 from the inner sidewall of the liquid cooled upper plate 320 at the cooling recess 360.

It can be understood that, in this embodiment, by providing the cooling groove 360 on the liquid cooling upper plate 320 and providing the interlayer 700 between the inner sidewall of the cooling groove 360 and the heat conduction member 500 on the liquid cooling upper plate 320, collision and abrasion between the heat conduction member 500 and the liquid cooling upper plate 320 can be avoided; and simultaneously, the tightness of the connection part of the heat conduction member 500 and the liquid cooling upper plate 320 can be ensured so as to avoid leakage of the cooling liquid at the connection part.

More specifically, the barrier 700 is a thermally conductive structural adhesive.

As shown in fig. 2 and 3, in this embodiment, the heat-conducting structural adhesive is exemplarily illustrated to have the advantages of uniform lamination, good heat conductivity, good elasticity, excellent adhesion effect, wide temperature resistance range, good durability, and the like, and when the interlayer 700 is set as the heat-conducting structural adhesive, it can not only have a better protection effect on the heat pipe, but also have a better sealing effect, and can also ensure the heat transfer effect between the heat pipe and the liquid cooling plate 300.

Specifically, the extending direction of the liquid cooling flow channel 330 includes a first direction and a second direction, the first direction is perpendicular to the second direction, and the bottom side of the battery cell 100 contacts the liquid cooling upper plate 320.

As shown in fig. 3, in the present embodiment, it is exemplarily illustrated that the first direction may be a length direction of the liquid cooling plate 300, and the second direction may be a width direction of the liquid cooling plate 300. Of course, in some embodiments, the first direction and the second direction may be interchanged. When the liquid cooling flow channel 330 extends on the liquid cooling lower plate 310, it may extend forward along the first direction, and may extend from one end of the liquid cooling upper plate 320 to the other end thereof; then may extend a small distance in the second direction; then, the liquid cooling upper plate 320 may extend reversely along the first direction, and may extend from one end to the other end thereof; and then may extend a further short distance in the second direction and then circulate in turn. In other words, the liquid cooling flow path 330 extends along a path resembling a continuous "S" shape. The battery cell 100 is arranged on the liquid-cooled upper plate 320; in other words, when the battery cell 100 is arranged, the bottom side thereof abuts against the liquid cooling plate 300. When the liquid cooling flow channel 330 extends, the vertical projection of the liquid cooling flow channel passes through at least one side of the bottom of the battery cell 100, so that the cooling liquid has a better cooling effect on the battery cell 100 when passing through the liquid cooling flow channel 330.

Of course, in some embodiments, the liquid cooling channel 330 may also extend along a spiral-like path, and includes a first direction and a second direction perpendicular to each other when extending; wherein the spiral is preferably an equidistant spiral.

It can be appreciated that, in this embodiment, by reasonably setting the extending path of the liquid cooling channel 330, the cooling liquid can be uniformly distributed and circulated in the liquid cooling plate 300, so as to ensure that the liquid cooling plate 300 has a better cooling effect on the battery cell 100.

More specifically, the phase change body 400 is horizontally disposed in the first direction or the second direction, and the heat conductive member 500 is vertically disposed between the phase change body 400 and the liquid cooling plate 300.

As shown in fig. 1 and 3, in the present embodiment, it is exemplarily illustrated that when the long copper bar 200 is extended, the middle portion thereof may be horizontally disposed and extended in the first direction or the second direction; in this embodiment, the middle portion of the long copper bar 200 extends along the first direction, that is, the middle portion of the long copper bar 200 extends along the length direction of the water cooling plate. The middle portion of the copper bar 200 may be located directly above the portion of the liquid cooling flow channel 330 extending in the first direction, and the heat conductive member 500 may be vertically disposed with both ends respectively extending into the phase body 400 and the liquid cooling plate 300. The heat conductive members 500 may be further provided with a plurality of heat conductive members at equal intervals along the first direction; meanwhile, the heat conducting members 500 may be further disposed in a plurality of rows along the second direction, and the heat conducting members 500 in the plurality of rows may be disposed in a staggered manner, so as to enhance the heat exchange efficiency between the phase change body 400 and the liquid cooling plate 300.

It should be noted that, taking a state in which the battery modules are generally arranged as an example, the battery cell 100 may be disposed right above, where the battery cell 100 is located above, and the liquid cooling plate 300 is disposed right below the battery cell 100. Of course, the battery cell 100 may be inverted, i.e. the battery cell 100 is located below, and the liquid cooling plate 300 is disposed right above the battery cell 100; when the liquid cooling plate 300 is disposed directly above the electric core 100, the condensation section 510 of the heat pipe is located above and the evaporation section 520 is located below, and at this time, the liquid cooling medium of the heat pipe can return to the evaporation section 520 under the action of dead weight after being condensed.

Specifically, the battery module further includes a separator 800, and the separator 800 is disposed between adjacent two of the battery cells 100.

As shown in fig. 1 and 3, in the present embodiment, it is exemplarily illustrated that a plurality of electric cells 100 may be disposed on the liquid cooling plate 300 at intervals in a rectangular array distribution manner, and a partition 800 may be disposed between two adjacent electric cells 100, for example, the electric cells 100 are disposed in an array of 2×2, and the partition 800 may be disposed between two electric cells 100 adjacent in the width direction of the liquid cooling plate 300. Of course, the separator 800 may be disposed between two adjacent cells 100 along the length of the liquid cooling plate 300. The partition 800 may be rectangular and may be made of a material having superior heat insulating properties. When a thermal runaway phenomenon occurs in a certain cell 100, the separator 800 can reduce the interaction between the cells 100, so as to reduce the probability of thermal runaway occurring in the remaining cells 100.

The implementation principle of the battery module provided by the application is as follows:

When the battery module works, the temperature of the battery cell 100 rises, cooling liquid enters the liquid cooling flow channel 330 from the inlet water nozzle 340, and is discharged from the liquid cooling flow channel 330 from the outlet water nozzle 350, so as to circulate in the liquid cooling plate 300, and the liquid cooling plate 300 can cool the battery cell 100 due to direct abutting with the battery cell 100. The heat of the battery core 100 is further transferred to the pole piece 110 and the long copper bar 200 in sequence through the pole, when the temperature of the long copper bar 200 is increased due to the heat and is higher than the phase transition temperature of the phase transition material 420, the phase transition material 420 is changed from solid phase to liquid phase, and the heat of the long copper bar 200 is absorbed, so that the long copper bar 200 is cooled locally. Then, heat is transferred from the evaporation section 520 of the heat pipe to the condensation section 510 of the heat pipe, and because the condensation section 510 of the heat pipe extends into the liquid cooling flow channel 330, the heat can be taken away when the cooling liquid circulates, so that the phase change body 400 can continuously absorb heat to the long copper bar 200, and further continuously cool the long copper bar.

According to the application, the liquid cooling plate 300 is arranged, and the battery cell 100 is abutted against the liquid cooling plate 300, so that the battery cell 100 can be effectively cooled; and through setting up the phase change body 400 on long copper bar 200, and set up heat conduction spare 500 between phase change body 400 and liquid cooling board 300, can also make long copper bar 200's heat transfer to liquid cooling board 300 through heat conduction spare 500 after absorbing through phase change body 400 in proper order, and take away by the coolant liquid, and then can ensure simultaneously that carries out effectual cooling to long copper bar 200.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A battery module, characterized in that the battery module comprises:

the battery cells (100) are at least provided with two battery cells, and pole pieces (110) are arranged on the battery cells (100);

The long copper bar (200) is connected with the pole pieces (110) and electrically connects at least two battery cells (100);

a liquid cooling plate (300) in which a coolant is circulated, the battery cell (100) being in contact with the liquid cooling plate (300);

A phase change body (400) which is coated on at least a part of the long copper bar (200) and absorbs heat of the long copper bar (200) or releases heat to the long copper bar (200) through phase change;

And the two ends of the heat conduction piece (500) respectively extend into the liquid cooling plate (300) and the phase change body (400), and conduct heat from the phase change body (400) to the liquid cooling plate (300).

2. The battery module according to claim 1, wherein the heat conduction member (500) is a heat pipe, and includes a condensation section (510) and an evaporation section (520), the evaporation section (520) extends into the phase change body (400), and the condensation section (510) extends into the liquid cooling plate (300).

3. The battery module according to claim 1, wherein the phase change body (400) comprises an insulating layer (410), a phase change material (420) and a shell (430), the insulating layer (410) is coated on the long copper bar (200), the shell (430) is sleeved on the insulating layer (410), and the phase change material (420) is arranged in the shell (430).

4. The battery module according to claim 3, wherein the phase change material (420) is a paraffin expanded graphite composite phase change material.

5. The battery module according to claim 1, wherein the liquid cooling plate (300) comprises a liquid cooling lower plate (310) and a liquid cooling upper plate (320), a liquid cooling flow channel (330) is arranged on one side of the top of the liquid cooling lower plate (310), the liquid cooling upper plate (320) and the liquid cooling lower plate (310) are arranged in an involution mode, the battery cell (100) is arranged on the liquid cooling upper plate (320), an inlet water nozzle (340) and an outlet water nozzle (350) which are communicated with the liquid cooling flow channel (330) are arranged on the liquid cooling upper plate (320) or the liquid cooling lower plate (310), and the cooling liquid enters the liquid cooling flow channel (330) from the inlet water nozzle (340) and is discharged from the outlet water nozzle (350).

6. The battery module according to claim 5, wherein the liquid cooling upper plate (320) is provided with a cooling groove (360), the cooling groove (360) is communicated with the liquid cooling flow channel (330), one end of the heat conducting member (500) extends into the cooling groove (360), and an interlayer (700) is arranged between the inner side wall of the cooling groove (360) and the heat conducting member (500) of the liquid cooling upper plate (320).

7. The battery module according to claim 6, wherein the separator (700) is a heat conductive structural adhesive.

8. The battery module according to claim 5, wherein the extending direction of the liquid cooling flow channel (330) includes a first direction and a second direction, the first direction is perpendicular to the second direction, and a bottom side of the battery cell (100) is in contact with the liquid cooling upper plate (320).

9. The battery module according to claim 8, wherein the phase change body (400) is horizontally disposed along the first direction or the second direction, and the heat conduction member (500) is vertically disposed between the phase change body (400) and the liquid cooling plate (300).

10. The battery module according to claim 1, further comprising a separator (800), the separator (800) being disposed between adjacent two of the cells (100).