CN111934052A

CN111934052A - Liquid cooling laminate polymer battery module, battery system and electric vehicle

Info

Publication number: CN111934052A
Application number: CN202010808590.6A
Authority: CN
Inventors: 刘彦超; 戴国群; 刘安钢
Original assignee: Pilotage Innovation Energy Battery Technology Research Institute Beijing Co Ltd
Current assignee: Pilotage Innovation Energy Battery Technology Research Institute Beijing Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-13

Abstract

The embodiment of the invention provides a liquid-cooled soft package battery module, a battery system and an electric vehicle. According to the liquid-cooled soft package battery module, the battery system and the electric vehicle provided by the embodiment of the invention, the battery cores and the liquid-cooled plates are overlapped in a horizontal layer mode, and the battery cores are separated from each other by the liquid-cooled plates, so that the battery cores are completely contacted with the liquid-cooled plates, the maximum effective heat dissipation area is formed, the heat dissipation effect is improved, the temperature of each battery core is reduced, and the temperature difference between the battery cores is reduced. In addition, the water inlets and the water outlets of the plurality of liquid cooling plates are respectively connected with one liquid cooling plate interface, so that the cooling liquid in each liquid cooling plate can be uniform and consistent.

Description

Liquid cooling laminate polymer battery module, battery system and electric vehicle

Technical Field

The invention relates to the technical field of power batteries, in particular to a liquid-cooled soft package battery module, a battery system and an electric vehicle.

Background

The mode that current laminate polymer battery module all piles up through electric core is basically in groups, is about to electric core pile up layer upon layer together, through converging the copper bar with a plurality of electric core series-parallel connection together, the corresponding structure of rethread is insulating and fixed to form a basic laminate polymer module, form different battery systems by a plurality of laminate polymer battery modules again and supply equipment such as electric vehicle to use. The temperature control plays an important role in the application of the soft package battery module, and the battery system needs to be preheated to stabilize the performance of the battery core under the low-temperature condition; and the heat generated by the battery cell is released during quick charge or high-power discharge so as to prolong the service life of the battery system. The existing mode of controlling the temperature of the battery system mainly comprises two modes of controlling the temperature of the whole battery system and controlling the temperature of a battery module.

The mode that current carries out temperature control to battery module mainly dispels the heat or dispels the heat with the help of outside liquid cooling system to range upon range of electric core with the help of the heat conduction material layer. For example, the soft-package battery module is contacted with an external liquid cooling plate or a heat conducting plate to dissipate heat. But because laminate polymer battery module's structural feature, laminate polymer battery module and the position of outside liquid cooling board and heat conduction dish contact are the side or the electric core bottom surface of range upon range of electric core only, and effectual area of contact is little, and the electric core heat that gives off through liquid cooling board and heat-conducting plate only has a small part, and most heat is still detained inside electric core to lead to electric core heat dissipation inequality, the difference in temperature is big, influences the performance and the life of electric core. Under the condition of high-rate charge and discharge, the battery core is easy to generate thermal runaway due to uneven heat dissipation, and the safety and reliability of the whole battery system are affected.

Disclosure of Invention

The embodiment of the invention provides a liquid-cooled soft-package battery module, a battery system and an electric vehicle, which are used for solving the defect of large uneven heat dissipation temperature difference of the soft-package battery module in the prior art, realizing the improvement of the heat dissipation performance of the soft-package battery module, and prolonging the service life and the service performance.

The embodiment of the invention provides a liquid-cooled soft package battery module, which comprises a plurality of battery cores and a plurality of liquid-cooled plates, wherein the plurality of liquid-cooled plates and the plurality of battery cores are tiled and stacked, the battery cores are separated by the liquid-cooled plates, each liquid-cooled plate is provided with a water inlet and a water outlet, the plurality of water inlets are connected with the same liquid-cooled plate interface, and the plurality of water outlets are connected with the other liquid-cooled plate interface.

According to the liquid-cooled soft package battery module, a layer of liquid-cooled plate is respectively tiled on two opposite sides of each layer of battery cell, or a layer of liquid-cooled plate is laid between two adjacent layers of battery cells.

The liquid-cooled soft package battery module further comprises an aluminum shell, a front support assembly, a rear support assembly, a long copper bar assembly, protective covers and a flexible circuit board, wherein the battery cell and the liquid-cooled plate are arranged in the aluminum shell, the two front support assemblies are fixedly arranged at two open ends of the aluminum shell, two liquid-cooled plate interfaces are respectively arranged at the water inlet and the water outlet and are fixedly connected with the front support assembly, the flexible circuit board is erected on the aluminum shell and is electrically connected with the front support assemblies, the two rear support assemblies are correspondingly arranged at the outer sides of the two front support assemblies, the long copper bar assembly is fixedly arranged at an upper cover of the aluminum shell, the two protective covers are correspondingly covered at the outer sides of the two rear support assemblies, the aluminum shell comprises an upper cover and a lower cover, the upper cover and the lower cover are fixedly connected to form a space for accommodating the battery cell and the liquid-cooled plate, the upper cover is provided with a nut column, and the long copper bar assembly is fixedly arranged on the upper cover through the nut column.

According to the liquid-cooled soft package battery module, the front support assembly comprises a plastic front support and a copper bar, the plastic front support is fixedly installed on the aluminum shell and fixedly connected with the liquid cooling plate interface, the copper bar is fixedly installed on the outer side of the plastic front support, a tab of the battery cell penetrates through the plastic front support to be connected with the copper bar, and the flexible circuit board is electrically connected with the copper bar.

According to the liquid-cooling soft package battery module, the rear support assembly comprises a plastic rear support and an output copper bar, the plastic rear support is fixedly connected with the plastic front support, the output copper bar is fixedly arranged on the outer side of the plastic rear support, and the output copper bar is electrically connected with the lug of the battery cell and the flexible circuit board.

According to the liquid-cooling soft package battery module, the long copper bar assembly comprises a long copper bar, an upper plastic cover plate and a lower plastic cover plate, the upper plastic cover plate and the lower plastic cover plate are clamped on two opposite sides of the long copper bar, and two ends of the long copper bar are exposed out of the upper plastic cover plate and the lower plastic cover plate so as to be electrically connected with the output copper bar.

According to the liquid-cooling soft package battery module, the plastic protection cover comprises a protection cover plate, an output protection cover and a lug protection cover, the protection cover plate and the output protection cover are respectively and fixedly connected with the plastic rear support, the protection cover plate and the output protection cover are integrally formed or spliced into a whole, and the lug protection cover is mounted on the plastic rear support in a buckling mode.

According to the liquid-cooling soft package battery module, the interface of the liquid-cooling plate comprises a quick plug connector, a fixing plate and a fixing frame, the fixing frame comprises a square frame and support lugs arranged on two sides of the square frame, the support lugs are fixedly connected with screw holes arranged on two sides of the water outlet or the water inlet, the fixing plate is fixedly covered on one side of the square frame, the quick plug connector is fixedly arranged on one side, far away from the square frame, of the fixing plate, a partition plate is arranged in the square frame and divides the square frame into a plurality of plug ports, and the water outlet and the water inlet of the liquid-cooling plate are inserted in the plug ports and sealed through sealing rings.

The embodiment of the invention also provides a battery system which comprises the liquid-cooling soft package battery module.

The embodiment of the invention also provides an electric vehicle, which comprises the battery system.

According to the liquid-cooled soft package battery module, the battery system and the electric vehicle provided by the embodiment of the invention, the battery cores and the liquid-cooled plates are overlapped in a horizontal layer mode, and the battery cores are separated from each other by the liquid-cooled plates, so that the battery cores are completely contacted with the liquid-cooled plates, the maximum effective heat dissipation area is formed, the heat dissipation effect is improved, the temperature of each battery core is reduced, and the temperature difference between the battery cores is reduced. In addition, the water inlets and the water outlets of the plurality of liquid cooling plates are respectively connected with one liquid cooling plate interface, so that the cooling liquid in each liquid cooling plate can be uniform and consistent.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a liquid-cooled pouch battery module according to an embodiment of the present invention;

fig. 2 is an exploded view of a liquid-cooled pouch battery module according to an embodiment of the present invention;

fig. 3 is an assembly diagram of a battery cell and a liquid cooling plate according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a liquid-cooled panel provided by an embodiment of the present invention;

FIG. 5 is an enlarged view of the liquid cooled plate shown in FIG. 4 at A;

FIG. 6 is an exploded view of an aluminum housing provided by an embodiment of the present invention;

FIG. 7 is an exploded view of a liquid cold plate interface provided by an embodiment of the present invention;

FIG. 8 is an exploded view of a front carrier assembly provided by an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a flexible printed circuit provided in an embodiment of the present invention;

FIG. 10 is a schematic view of an installation of a cold plate interface provided by an embodiment of the present invention;

FIG. 11 is an assembly view of a liquid cooled plate outlet according to an embodiment of the present invention;

fig. 12 is a partial assembly view of the liquid cooling board interface, the flexible printed circuit board and the aluminum case according to the embodiment of the invention;

FIG. 13 is a schematic structural view of a rear bracket assembly provided by an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a long copper bar assembly according to an embodiment of the present invention;

fig. 15 is a schematic mounting diagram of a tab protection cover according to an embodiment of the present invention;

fig. 16 is a schematic view illustrating an output protection cover and a mounting of a protection cover substrate according to an embodiment of the present invention.

Reference numerals:

10. an electric core; 20. a liquid-cooled plate; 21. a water inlet; 22. a water outlet; 23. a screw hole; 24. a seal ring; 30. a liquid cold plate interface; 31. a fixed mount; 32. a fixing plate; 33. a quick connector; 34. a threaded hole; 35. a partition plate; 36. a liquid cooling plate protective sleeve; 37. a card slot; 38. a mounting frame; 39. reinforcing ribs; 40. an aluminum shell; 41. an upper cover; 42. a lower cover; 43. a nut post; 44. positioning pins; 50. a front carrier assembly; 51. a plastic front bracket; 52. copper bars; 53. a first connection hole; 54. a second connection hole; 55. a third connection hole; 56. buckling; 60. a flexible circuit board; 61. an output interface; 62. a circuit board fixing hole; 70. a rear bracket assembly; 71. a plastic rear support; 72. outputting copper bars; 73. an interface through hole; 80. a long copper bar assembly; 81. a plastic upper cover plate; 82. a long copper bar; 83. a plastic lower cover plate; 84. mounting holes; 90. a plastic protective cover; 91. a protective cover plate; 92. a tab protecting cover; 93. an output protective cover; 94. a protective cover substrate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "first" and "second" are used for the sake of clarity in describing the numbering of the components of the product and do not represent any substantial difference, unless explicitly stated or limited otherwise. The directions of "up", "down", "left" and "right" are all based on the directions shown in the attached drawings. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a liquid-cooled soft package charging module, which includes a plurality of battery cells 10 and a plurality of liquid-cooled plates 20, where the plurality of battery cells 10 and the plurality of liquid-cooled plates 20 are stacked in a tiled manner. The cells 10 are separated from each other by a plurality of liquid cooled plates 20. For example, as shown in fig. 3, one liquid cooling plate 20 is disposed on every other cell 10, that is, when there are six cells 10, one liquid cooling plate 20 is disposed between two cells 10, and there are five liquid cooling plates 20; of course, a layer of liquid cooling plate 20 may be additionally disposed outside the topmost and bottommost cells 10 among the six layers of cells 10, and in this case, there are seven layers of liquid cooling plates 20 in total. For another example, a layer of liquid cooling plate 20 is disposed between every two battery cells 10, that is, when there are six battery cells 10, a layer of liquid cooling plate 20 is disposed between every two battery cells 10, and there are two layers of liquid cooling plates 20. Similarly, a layer of liquid cooling plate 20 may be added outside the cell 10 located at the top and bottom to further improve the heat dissipation capability of the cell 10. Each liquid cooling plate 20 is provided with a water inlet 21 and a water outlet 22, the water inlets 21 of the plurality of liquid cooling plates 20 are connected with the same liquid cooling plate interface 30, and the water outlets 22 of the plurality of liquid cooling plates 20 are connected with another liquid cooling plate interface 30, so that the plurality of liquid cooling plates 20 share the water inlet interface and the water outlet interface by means of the liquid cooling plate interfaces 30.

In the liquid-cooled soft package battery module provided by the embodiment of the invention, the battery cells 10 and the liquid-cooled plates 20 are tiled and stacked, and the battery cells 10 are separated from each other by the liquid-cooled plates 20, so that the battery cells 10 are completely contacted with the liquid-cooled plates 20, and the maximum effective heat dissipation area is formed, thereby improving the heat dissipation effect, reducing the temperature of each battery cell 10 and reducing the temperature difference between the battery cells 10. In addition, the water inlets 21 and the water outlets 22 of the plurality of liquid cooling plates 20 are respectively connected with one liquid cooling plate interface 30, so that the cooling liquid in each liquid cooling plate 20 can be uniform.

As shown in fig. 4 and 5, the water inlet 21 and the water outlet 22 have the same shape and a square cross section. The liquid cooling plate 20 is a plate body formed by a circulation pipeline formed by arranging square pipes in a snake shape. And performing insulation treatment on the surface of the liquid cooling plate 20 to improve the insulation performance between the battery cell 10 and the liquid cooling plate 20.

On the basis of the above embodiment, as shown in fig. 2, the liquid-cooled pouch battery module according to the embodiment of the present invention further includes an aluminum case 40, a front bracket assembly 50, a flexible circuit board 60, a rear bracket assembly 70, a long copper bar assembly 80, and a plastic protection cover 90. The battery cell 10 and the liquid cooling plate 20 are accommodated and fixed in the aluminum case 40, and the two front bracket assemblies 50 are fixedly mounted at two open ends of the aluminum case 40. The two liquid cooling plate connectors 30 are installed at the water inlet 21 and the water outlet 22 of the liquid cooling plate 20, and the two liquid cooling plate connectors 30 are fixedly arranged at two sides of the front bracket assembly 50 in the length direction. The flexible circuit board 60 is erected on the aluminum shell 40 and connected with the front support assemblies 50, the two rear support assemblies 70 are correspondingly installed on the outer sides of the two front support assemblies 50, the long copper bar assembly 80 is installed on the aluminum shell 40 and connected with the rear support assemblies 70, and the two plastic protective covers 90 are correspondingly installed on the outer sides of the two rear support assemblies 70. Wherein the inner side refers to a side facing the inside of the aluminum case 40, and the outer side refers to a side facing away from the inside of the aluminum case 40.

Specifically, as shown in fig. 6, the aluminum shell 40 is made of metal aluminum to form a hollow shell, and the whole body is in a rectangular parallelepiped shape with two open ends. The open end corresponds to the side face in the width direction of the rectangular parallelepiped. The aluminum case 40 includes an upper cover 41 and a lower cover 42, and the upper cover 41 and the lower cover 42 are fixed together to form a space for accommodating the battery cell 10 and the liquid cooling plate 20. Two sides of the upper cover 41 and the lower cover 42 in the length direction are respectively provided with a folded edge, and the folded edges are abutted and then fixed by laser welding. The height of the folded edge is equal to the overall height of the electric core 10 and the liquid cooling plate 20 after being tiled and stacked, so that the overall strength of the aluminum shell 40 is ensured. With electric core 10 and liquid cooling board 20 one-by-one alternately shop for the example, during the equipment, it is fixed as a whole through beating the gluey mode with electric core 10 and liquid cooling board 20 earlier, then put into lower cover 42 with electric core 10 and liquid cooling board 20 are whole, it is fixed through beating the gluey mode with lower cover 42 internal surface to be located electric core 10 of bottommost, lock upper cover 41, it is fixed through beating the gluey mode with the internal surface of upper cover 41 to be located electric core 10 of topmost, carry out laser welding in upper cover 41 and lower cover 42's hem department. In addition, in order to increase the insulation between the battery cell 10 and the aluminum case 40, the inner bottom surface of the upper cover 41 and the inner bottom surface of the lower cover 42 are respectively subjected to insulation treatment. In addition, positioning pins 44 are respectively formed on the outer walls of the folded edges on both sides of the lower cover 42, and the positioning pins 44 extend in the longitudinal direction of the lower cover 42.

As shown in fig. 7, the liquid cooling plate interface 30 includes a fixing frame 31, a fixing plate 32 and a quick connector 33. The fixing plate 32 is welded on one side of the fixing frame 31, an overflowing through hole is formed in the middle of the fixing plate 32, the quick connector 33 and the fixing plate 32 are welded and fixed, and the overflowing through hole is sealed, so that a pipeline in the quick connector 33 is communicated with the inside of the fixing frame 31 through the overflowing through hole.

Specifically, the fixing frame 31 includes a square frame and support lugs disposed on both sides of the square frame. As shown in fig. 7, each lug has a plurality of threaded holes 34 formed therein. As shown in fig. 5, screw holes 23 are respectively formed near the water inlet 21 and the water outlet 22 of the liquid cooling plate 20. Along the width direction of the liquid cooling plate 20, a screw hole 23 is respectively arranged on both sides of the water inlet 21 and the water outlet 22. Screws are inserted through the screw holes 23 and the screw holes 34 to fixedly connect the fluid-cooled plate interface 30 with the fluid-cooled plate 20. With continued reference to fig. 7, a partition plate 35 is disposed inside the square frame, and the partition plate 35 divides the square frame into a plurality of sockets in accordance with the number of the liquid cooling plates 20. The water inlet 21 of each liquid cooling plate 20 is inserted into the socket and sealed by the sealing ring 24, and the sealing ring 24 is used to prevent the liquid from overflowing from the connection to affect the normal operation of the battery cell 10. The fixing plate 32 is welded and fixed on one side of the square frame of the fixing frame 31 to seal the side end of the square frame; a gap exists between the partition plate 35 and the fixing plate 32, and when liquid flows into the square frame through the through holes via the quick connector 33, the liquid is shunted and flows into each liquid cooling plate 20. The liquid flowing in the liquid cooling plate 20 may be low-temperature water or a cooling liquid containing other cooling media, which is not particularly limited.

As shown in fig. 8, the front bracket assembly 50 includes a plastic front bracket 51 and a copper bar 52, the copper bar 52 is fixedly mounted on the plastic front bracket 51 by hot-pressing riveting, and the copper bar 52 is welded to the tab of the battery cell 10. The plastic front bracket 51 is provided with a first connection hole 53, and a screw passes through the first connection hole 53 and the partial screw hole 34 to fixedly connect the liquid cold plate interface 30 with the plastic front bracket 51. As shown in fig. 9, one end of the flexible printed circuit 60 is provided with an output interface 61, and the output interface 61 has temperature sampling and voltage sampling functions. Two sides of the output interface 61 are respectively provided with a circuit board fixing hole 62, the plastic front bracket 51 is provided with a second connecting hole 54, and a screw penetrates through the circuit board fixing hole 62 and the second connecting hole 54 to fixedly connect the flexible circuit board 60 and the plastic front bracket 51. The flexible circuit board 60 is connected with the copper bar 52 in a welding way. In addition, the top and the bottom of the plastic front bracket 51 are also distributed with third connecting holes 55, the upper cover 41 and the lower cover 42 are correspondingly provided with through holes, and screws pass through the through holes and the third connecting holes 55 to fixedly mount the plastic front bracket 51 at the two open ends of the aluminum shell 40.

In a specific embodiment, the liquid cooling plate 20 has four layers, and two screw holes 23 are respectively disposed on two sides of the water inlet 21 and the water outlet 22 of each layer of the liquid cooling plate 20, as shown in fig. 10, two rows of screw holes are formed in the four layers of the liquid cooling plate 20 and are arranged along the stacking direction of the battery cells 10, and each row of the screw holes 23 is four screw holes. Ten threaded holes 34 are provided in each liquid-cooled plate port 30, and arranged in three rows. Wherein two are located two lugs and are close to one side of square frame, and eight screw holes 34 are shared in these two rows, and these eight screw holes 34 correspond the two rows of screw holes that form of inlet 21 or delivery port 22 department on the four layers of liquid cold plate 20 of connecting. The other row is located on the side of the inner support lug away from the square frame, and the row is provided with two threaded holes 34, and the two threaded holes 34 are correspondingly connected with the first connecting holes 53 on the plastic front support 51. The first connection hole 53 is arranged in a nut column shape.

As shown in fig. 1 and 2, the water inlet 21 and the water outlet 22 of the liquid cooling plate 20 are located on the same side of the liquid cooling plate 20, so that the liquid cooling plate 20 can be conveniently connected to an external liquid cooling system. The flexible circuit board 60 is erected on the upper cover 41, and the output interface 61, the water inlet 21 and the water outlet 22 are all located on the same side of the aluminum shell 40.

As shown in fig. 5 and 11, one end of the liquid cooling plate 20 is bent outward and led out to serve as a water inlet 21 and a water outlet 22, and in order to prevent the liquid impact from affecting the service life of the bent section, a liquid cooling plate protective sleeve 36 is fixedly mounted on the rear side of the water inlet 21 and the water outlet 22. As shown in fig. 11, the liquid cooling plate protection sleeve 36 is a plastic member, and has slots 37 with the same number as the liquid cooling plates 20, each layer of liquid cooling plate 20 is clamped in one slot 37, an installation frame 38 is fixedly sleeved outside the liquid cooling plate protection sleeve 36, and the installation frame 38 is welded and fixed to the upper cover 41 and the lower cover 42 of the aluminum shell 40, respectively. The mounting bracket 38 is made of aluminum and is provided with a reinforcing rib 39 on the mounting bracket 38 to improve the stability of the whole structure and the fluid impact resistance. Specifically, the mounting bracket 38 is screwed to the coldplate protective sleeve 36. Fig. 12 shows a partial connection structure of the assembled liquid cooling plate interface 30, the front bracket assembly 50 and the aluminum case 40.

As shown in fig. 13, the rear bracket assembly 70 includes a plastic rear bracket 71 and an output copper bar 72, and the output copper bar 72 is fixedly mounted on the plastic rear bracket 71 by thermal compression and riveting. The plastic rear support 71 is fixedly connected with the plastic front support 51 through screws, and the output copper bar 72 is respectively connected with the electrode lug of the battery cell 10 and the flexible circuit board 60 through laser welding. The plastic rear bracket 71 is provided with an interface through hole 73 at a position corresponding to the output interface 61, so that the output interface 61 is exposed after the plastic rear bracket 71 and the aluminum shell 40 are fixed.

As shown in fig. 2 and 14, the long copper bar assembly 80 includes an upper plastic cover plate 81, a long copper bar 82 and a lower plastic cover plate 83. The long copper bar 82 is clamped between the plastic upper cover plate 81 and the plastic lower cover plate 83, the end of the long copper bar 82 is exposed at two sides of the plastic upper cover plate 81 and the plastic lower cover plate 83 and is fixedly connected with the output copper bar 72 through screws respectively, and the plastic upper cover plate 81, the plastic lower cover plate 83 and the upper cover 41 are fixedly connected together through screws. As shown in fig. 14, a plurality of mounting holes 84 are respectively formed on both sides of the plastic upper cover plate 81 and the plastic lower cover plate 83 in the length direction, the nut posts 43 are preset on the upper cover 41, the nut posts 43 are arranged corresponding to the mounting holes 84, and the nut posts 43 sequentially penetrate through the mounting holes 84 of the plastic lower cover plate 83 and the plastic upper cover plate 81 and are fastened by screws.

As shown in fig. 2, the plastic protection cover 90 includes a protection cover plate 91 and a tab protection cover 92, and the protection cover plate 91 includes an output protection cover 93 and a protection cover substrate 94. The output protection cover 93 and the protection cover substrate 94 may be integrally formed or may be independent from each other. As shown in fig. 15, the tab protection cover 92 is snap-connected to the plastic rear bracket 71 and the plastic front bracket 51. The plastic rear support 71 is provided with a buckle and a clamping hole, the tab protecting cover 92 is provided with a clamping hole, the plastic front support 51 is provided with a buckle 56, and each buckle is clamped in the corresponding clamping hole. In addition, the lug protective cover 92 is convexly provided with positioning blocks, the protective cover plate 91 is provided with positioning grooves, and the positioning blocks correspond to the positioning grooves one by one and are matched with each other, so that the assembly is convenient. As shown in fig. 15, a through hole having the same size as the output protective cover 94 is formed in the middle of the protective cover substrate 93, and the two are fixed to the plastic rear bracket 71 by screws to form a complete plate. The plastic protective covers 90 have two plastic protective covers, wherein the protective cover 91 of one plastic protective cover 90 is integrally formed, and the protective cover 91 of the other plastic protective cover 90 is divided into two independent plate output protective covers 93 and a protective cover substrate 94. For example, when the positive and negative output interfaces of the battery cell are located at the same end, the protective cover plate 91 may be selected from a separated type and an integrally formed type, the positive and negative output interfaces are separated, and the other end of the protective cover plate 91 is integrally formed. Of course, if the positive and negative output interfaces of the battery cell are located at two ends, the two plastic protective covers 90 have the same structure and are separated from each other. As shown in fig. 16, the protective cover 91 is fixedly connected to the plastic rear bracket 71 by screws. When the protective cover 91 includes the output protective cover 93 and the protective cover substrate 94 that are independent of each other, they are respectively and fixedly connected to the plastic rear bracket 71 through screws. Wherein, the protection cover plate 91 is provided with a flange, the plastic upper cover plate 81 is provided with a groove, and the flange is clamped in the groove, thereby effectively sealing the long copper bar 82 with the plastic upper cover plate 81 after the protection cover plate 91 is installed, and improving the sealing effect.

According to the liquid-cooling soft package battery module provided by the embodiment of the invention, the liquid-cooling plates 20 are tiled and stacked with the battery cells 10, so that the side surfaces of the battery cells 10, namely the surfaces with the largest areas, are completely contacted with the liquid-cooling plates 20, thereby forming the largest effective heat dissipation area and improving the heat dissipation efficiency, and the combination mode of one layer of liquid-cooling plate 20 is arranged between two adjacent layers of battery cells 10, so that each battery cell 10 can be closely contacted with the liquid-cooling plates 20, and the temperature difference between the battery cells 10 is favorably reduced. Specifically, as shown in fig. 3, the liquid cooling laminate polymer battery module includes five electric cores 10 and four liquid cooling boards 20, each liquid cooling board 20 is pressed from both sides respectively between per two electric cores 10, with electric core 10 surface intimate contact, the coolant liquid flows into four liquid cooling boards 20 respectively through liquid cooling board interface 30 and inside the circulation flow that carries on, lead out the produced heat of electric core 10 itself through the coolant liquid, four liquid cooling boards 20 share liquid cooling board interface 30 as the end of intaking and the end of giving out water, guarantee that the inside coolant liquid of each liquid cooling board 20 can be even unanimous. In addition, the water inlet 21 and the water outlet 22 are located at the same end, so that an external pipeline is conveniently connected.

According to the liquid-cooled soft package battery module provided by the embodiment of the invention, the positive and negative output interfaces are positioned at the same end, so that the battery system can be conveniently connected in series; the aluminum shell 40 is formed by fixedly welding the upper cover 41 and the lower cover 42, and the heat dissipation performance is improved by increasing the base area of the aluminum material with the outside air through the excellent heat conduction performance of the aluminum material; the upper cover 41 and the lower cover 42 are integrated by laser welding after being buckled, so that the strength of the whole liquid-cooling soft package battery module is improved; the plastic front support 51, the plastic rear support 71 and the aluminum shell 40 are fixed by screw locking, so as to strengthen the protection of the electrode lug of the battery cell 10; the output interface 61 of the flexible circuit board 60 can output the voltage and the temperature information of each cell 10.

In addition, the embodiment of the invention also provides a battery system which comprises the liquid-cooling soft package battery module.

In addition, the embodiment of the invention also provides an electric vehicle which comprises the power battery.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a liquid cooling laminate polymer battery module, includes a plurality of electric cores, its characterized in that still includes a plurality of liquid cooling boards, and is a plurality of liquid cooling board and a plurality of electric core tiling is piled up, electric core quilt each other the liquid cooling board separates, each the liquid cooling board is equipped with water inlet and delivery port, and is a plurality of the water inlet links to each other with same liquid cooling board interface, and is a plurality of the delivery port is with another the liquid cooling board interface links to each other.

2. The liquid-cooled laminate battery module of claim 1, wherein a layer of the liquid-cooled panel is tiled on each of the opposite sides of the cells or a layer of the liquid-cooled panel is tiled between two adjacent cells.

3. The liquid-cooled soft package battery module according to claim 1 or 2, further comprising an aluminum case, a front frame assembly, a rear frame assembly, a long copper bar assembly, a protection cover and a flexible printed circuit board, wherein the battery cell and the liquid-cooled board are installed in the aluminum case, the two front frame assemblies are fixedly installed at two open ends of the aluminum case, the two liquid-cooled board interfaces are respectively installed at the water inlet and the water outlet and are fixedly connected with the front frame assembly, the flexible printed circuit board is erected on the aluminum case and is electrically connected with the front frame assemblies, the two rear frame assemblies are correspondingly installed at the outer sides of the two front frame assemblies, the long copper bar assembly is fixedly installed at the upper cover of the aluminum case, the two protection covers are correspondingly covered at the outer sides of the two rear frame assemblies, wherein the aluminum case comprises an upper cover and a lower cover, the upper cover and the lower cover are fixedly connected to form a space for accommodating the battery cell and the liquid cooling plate, the upper cover is provided with a nut column, and the long copper bar assembly is fixedly installed on the upper cover through the nut column.

4. The liquid-cooled soft package battery module of claim 3, wherein the front bracket assembly comprises a plastic front bracket and a copper bar, the plastic front bracket is fixedly mounted on the aluminum shell and fixedly connected with the liquid-cooled plate interface, the copper bar is fixedly mounted on the outer side of the plastic front bracket, a tab of the battery cell penetrates through the plastic front bracket and is connected with the copper bar, and the flexible circuit board is electrically connected with the copper bar.

5. The liquid-cooled soft package battery module of claim 4, wherein the rear support assembly comprises a plastic rear support and an output copper bar, the plastic rear support is fixedly connected with the plastic front support, the output copper bar is fixedly mounted on the outer side of the plastic rear support, and the output copper bar is electrically connected with the tab of the battery cell and the flexible circuit board.

6. The liquid-cooled soft package battery module of claim 5, wherein the long copper bar assembly comprises a long copper bar, an upper plastic cover plate and a lower plastic cover plate, the upper plastic cover plate and the lower plastic cover plate are clamped on two opposite sides of the long copper bar, and two ends of the long copper bar are exposed on the upper plastic cover plate and the lower plastic cover plate so as to be electrically connected with the output copper bar.

7. The liquid-cooled pouch battery module of claim 6, wherein the plastic protective cover comprises a protective cover plate, an output protective cover and a tab protective cover, the protective cover plate and the output protective cover are respectively fixedly connected to the plastic rear bracket, the protective cover plate and the output protective cover are integrally formed or spliced into a whole, and the tab protective cover is mounted on the plastic rear bracket in a snap-fit manner.

8. The liquid-cooled laminate battery module of claim 1, wherein the liquid-cooled plate interface comprises a quick connector, a fixing plate and a fixing frame, the fixing frame comprises a square frame and support lugs arranged on two sides of the square frame, the support lugs are fixedly connected with screw holes arranged on two sides of the water outlet or the water inlet, a fixing cover of the fixing plate is arranged on one side of the square frame, the quick connector is fixedly arranged on one side, away from the square frame, of the fixing plate, a partition plate is arranged in the square frame and divides the square frame into a plurality of insertion ports, the water outlet is located on the same side of the battery core as the water inlet, and the water outlet and the water inlet of the liquid-cooled plate are inserted into the insertion ports and sealed through sealing rings.

9. A battery system comprising the liquid-cooled pouch battery module of any of claims 1-8.

10. An electric vehicle characterized by comprising the battery system according to claim 9.