Battery module and electric equipment

Abstract

The invention discloses a battery module and electric equipment, the battery module comprises a plurality of battery cell assemblies and a liquid cooling plate, each battery cell assembly comprises a plurality of battery cells arranged along a first direction, each battery cell comprises a shell, an electrode assembly and a tab, the shell comprises a main body part, a top sealing part and two oppositely arranged side sealing parts which are connected with each other, the electrode assembly is located in the main body part in the second direction, the two side sealing parts are located on the two sides of the main body part respectively, the tabs extend out of the top sealing part, and the side sealing parts comprise extending parts exceeding the main body part in the third direction; the first plate body comprises a first base part and a plurality of first bulges which are convexly arranged from the first base part to the main body parts, the first bulges are connected with each main body part of the same battery core assembly, the first bulges are arranged between the two extension parts of the same battery core, and a flow channel is arranged below the first bulges.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of energy storage, and in particular to a battery module and an electrical device. Background Art

[0002] In the field of modern electronic equipment, battery modules are core components for energy storage and supply. Their performance stability and safety are directly related to the operating efficiency and safety of the entire electrical equipment (such as electric vehicles).

[0003] A battery module is usually composed of multiple cells (or battery units) connected in series or in parallel to meet the voltage and current requirements of different devices. However, in actual use, due to the heat generated by the chemical reaction inside the cell and the energy loss during the current transmission between cells, each cell will generate a certain amount of heat, causing the temperature inside the module to rise. The increase in the temperature of the battery module will not only affect the performance of the cell itself, such as shortening the battery cycle life and reducing the charging and discharging efficiency. Therefore, it is necessary to design a battery module that can cool multiple cells. Summary of the invention

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a battery module capable of cooling down battery cells.

[0005] The embodiment of the present invention solves the technical problem by adopting the following technical solution:

[0006] A battery module comprises at least one battery cell assembly and a liquid cooling plate, each battery cell assembly comprises a plurality of battery cells arranged along a first direction, the battery cell comprises a shell, an electrode assembly and a pole ear, the shell comprises a main body portion, a top seal portion and two oppositely arranged side seal portions connected to each other, the electrode assembly is located in the main body portion, along the second direction, the two side seal portions are respectively located on both sides of the main body portion, the pole ear extends from the top seal portion, along the third direction, the side seal portion comprises an extension portion exceeding the main body portion, the first direction, the second direction and the third direction are perpendicular to each other; the liquid cooling plate comprises a flow channel, the liquid cooling plate comprises a first plate body and a second plate body stacked and connected along the third direction, the first plate body comprises a first base portion and at least one first protrusion, each of the first protrusions is protruded from the first base portion toward the main body portion, the first protrusion is connected to each of the main bodies of the same battery cell assembly, the first protrusion is arranged between the two extension portions of the same battery cell of the same battery cell assembly, and a flow channel is arranged below the first protrusion.

[0007] In one or more optional embodiments above, the second plate body is provided with a plurality of second protrusions spaced apart along the first direction, the plurality of second protrusions are all protruding along a direction opposite to the third direction, and the plurality of second protrusions are all connected to the first protrusion.

[0008] In one or more optional embodiments above, the flow channel includes at least two first flow channels and at least one second flow channel, there are at least two groups of battery cell assemblies, and at least two groups of battery cell assemblies are arranged at intervals along the second direction; there are at least two first protrusions, and at least two first protrusions are arranged at intervals along the second direction, one first protrusion is connected to a group of battery cell assemblies, and the first flow channel is provided under each first protrusion; wherein, the second plate body is provided with at least one recessed portion along the third direction, the recess and the first plate body constitute the second flow channel, and one second flow channel connects two adjacent first flow channels; along the second direction, the projection of the recess is located between the projections of two adjacent first protrusions.

[0009] In one or more of the above optional embodiments, the battery module includes an insulating member, the insulating member includes a first part, and the first part extends along the first direction; wherein the first part includes an abutment portion and two recessed portions, the opposite sides of the abutment portion are respectively connected to the two recessed portions, the two recessed portions are respectively located on the opposite sides of the first protrusion, and one of the extension portions is located in one of the recessed portions.

[0010] In one or more optional embodiments above, the insulating member includes a second portion connected to the first portion, the second portion is located on one side of the battery cell assembly along the second direction, and the second portion is connected to a side sealing portion of the same battery cell assembly.

[0011] In one or more of the above optional embodiments, the insulating member comprises a polycarbonate film.

[0012] In one or more of the above optional embodiments, the battery module includes a bracket and at least two end walls, along the first direction, a battery cell assembly is located between the two end walls, the bracket and the two end walls are fixed, and the end walls are configured to limit the expansion of the battery cell assembly; at least part of the bracket and the second part are located on one side of the same battery cell assembly, and the insulating member is located between the bracket and the battery cell assembly.

[0013] In one or more of the above optional embodiments, the bracket includes a horizontal portion and a vertical portion connected to each other, the vertical portion and the second portion are located on one side of the same battery cell assembly, and at least one of the horizontal portion and the vertical portion is provided with a connecting portion, and the connecting portion is fixed to the two end walls; wherein the horizontal portion includes two receiving grooves and a flat portion connected to the first protrusion, and the recessed portion is located in one of the receiving grooves.

[0014] In one or more of the above optional embodiments, the battery module includes a conductive member and a shell, the shell is connected to the liquid cooling plate and forms a accommodating cavity, and the battery cell assembly is located in the accommodating cavity; the conductive member is connected to the shell and exposed outside the accommodating cavity, and the conductive member is configured to be connected to an external device; the battery module includes a liquid inlet connector and a liquid outlet connector, the liquid inlet connector and the liquid outlet connector are both provided on the liquid cooling plate and communicated with the flow channel, and the liquid inlet connector and the liquid outlet connector are both located outside the accommodating cavity.

[0015] In one or more of the above optional embodiments, the outer shell includes a top wall, and the top wall and the liquid cooling plate are located on opposite sides of the battery cell assembly; the battery module includes a thermal insulation member located in the accommodating cavity, and the thermal insulation member is arranged on the top wall, and the thermal conductivity of the thermal insulation member at 25°C is less than 0.04 (W / (m·K)).

[0016] In one or more of the above optional embodiments, the thermal insulation element comprises foamed rubber.

[0017] The embodiment of the present invention also adopts a technical solution to solve the technical problem: an electrical device, including the above-mentioned battery module.

[0018] The beneficial effects of the embodiments of the present invention are as follows: the battery module provided by the embodiments of the present application comprises at least one battery cell assembly and a liquid cooling plate, each battery cell assembly comprises a plurality of battery cells arranged along a first direction, the battery cell comprises a shell, an electrode assembly and a pole ear, the shell comprises a main body portion, a top sealing portion and two oppositely arranged side sealing portions connected to each other, the electrode assembly is located in the main body portion, along the second direction, the two side sealing portions are respectively located on both sides of the main body portion, the pole ear extends from the top sealing portion, along the third direction, the side sealing portion comprises an extension portion extending beyond the main body portion, and the first direction, the second direction and the third direction are perpendicular to each other; the liquid cooling plate comprises a flow channel, which comprises a first plate body and a second plate body stacked and connected along the third direction, the first plate body comprises a first base portion and at least one first protrusion, each first protrusion is protruded from the first base portion toward the main body portion, the first protrusion is connected to each main body portion of the same battery cell assembly, the first protrusion is arranged between the two extension portions of the same battery cell of the same battery cell assembly, and a flow channel is arranged below the first protrusion. This facilitates the abutment between the main body of the battery cell and the first protrusion, shortens the distance between the flow channel and the main body of the battery cell, and facilitates better absorption of the heat of the battery cell when the cooling medium is passed into the flow channel, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 It is a structural schematic diagram of a battery module of one embodiment of the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle part;

[0022] Figure 3 It is a schematic diagram of the battery cell;

[0023] Figure 4 yes Figure 1 A cross-sectional view of

[0024] Figure 5 It is a schematic diagram of the structure of the liquid cooling plate;

[0025] Figure 6 is a schematic diagram of the back side of the first plate;

[0026] Figure 7 is a schematic structural diagram of a second plate body;

[0027] Figure 8 yes Figure 7 Schematic diagram from another perspective;

[0028] Fig. 9 It is a schematic diagram of the flow channel of the liquid cooling plate;

[0029] Fig.10 It is a schematic diagram of the structure of the insulating member;

[0030] Fig.11 is a structural schematic diagram of the second side panel;

[0031] Fig.12 yes Figure 4 A partial schematic diagram of

[0032] In the figure: 1. battery module; 2. battery cell assembly; 3. liquid cooling plate; 4. insulating member; 5. bracket; 6. end wall; 7. liquid inlet connector; 8. liquid outlet connector; 9. housing; 10. conductive member;

[0033] 21. Battery cell; 22. Circuit board;

[0034] 211, housing; 212, tab; 221, busbar; 2201, opening;

[0035] 2111, main body; 2112, top sealing portion; 2113, side sealing portion; 2114, extension portion;

[0036] 31. first plate body; 32. second plate body; 301. flow channel;

[0037] 3011, first flow channel; 3012, second flow channel;

[0038] 311, first base; 312, first protrusion; 313, liquid inlet hole; 314, liquid outlet hole; 315, limit part;

[0039] 3121, concave cavity;

[0040] 321, second protrusion; 322, recess; 323, third protrusion; 325, first protrusion; 326, second protrusion; 327, diverter groove; 328, connecting groove; 329, supporting protrusion; 3210, first protrusion; 3211, second protrusion;

[0041] 3251, first groove; 3261, second groove;

[0042] 41. Part I; 42. Part II;

[0043] 411, abutment portion; 412, recessed portion;

[0044] 51. horizontal part; 52. vertical part; 53. connecting part;

[0045] 511, receiving groove; 512, flat portion;

[0046] 901, accommodating chamber; 91, top wall; 92, outer wall; 921, convex edge. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0049] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] like Figure 1 , Figure 2 and Fig. 9 As shown, a battery module 1 provided in one embodiment of the present application includes at least one battery cell assembly 2 and a liquid cooling plate 3. Each battery cell assembly 2 is arranged on the liquid cooling plate 3. The liquid cooling plate 3 is provided with a flow channel 301 for constraining the cooling medium to flow along a preset trajectory. When the cooling medium is introduced into the flow channel 301 of the cooling plate, the cooling medium will absorb the heat transferred by the battery cell assembly 2 to reduce the temperature of the battery cell assembly 2.

[0051] like Figure 2As shown, each battery cell assembly 2 includes a plurality of battery cells 21 arranged along a first direction X. In some embodiments, the plurality of battery cells 21 are directly stacked along the first direction X. In other embodiments, the plurality of battery cells 21 are indirectly stacked along the first direction X. For example, a buffer foam is arranged between two adjacent battery cells 21, which is beneficial to reduce the risk of direct squeezing of the two adjacent battery cells 21, and can also reserve expandable space for the expansion of the battery cells 21.

[0052] In some embodiments, Figure 3 As shown, the battery cell 21 is a soft-pack battery cell 21, and the battery cell 21 includes a shell 211, an electrode assembly (not shown) and a pole ear 212. The shell 211 includes a main body 2111, a top seal 2112 and two oppositely arranged side seals 2113, the electrode assembly is arranged in the main body 2111, and along the second direction Y, the two side seals 2113 are distributed on both sides of the main body 2111, one end of the pole ear 212 is connected to the electrode assembly, and the other end of the pole ear 212 extends from the top seal 2112. Wherein, along the third direction Z, each side seal 2113 includes an extension portion 2114 that exceeds the main body 2111. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0053] In some embodiments, the shell 211 is made of an aluminum-plastic film. During processing, a pit for placing the electrode assembly with the pole ear 212 is first punched out on the aluminum-plastic film. After the placement is completed, the aluminum-plastic film is folded in half to cover the pit. At the same time, the edge of the folded aluminum-plastic film is subjected to an edge sealing process. After the edge sealing process, the edge is folded again, so that the part of the aluminum-plastic film that is punched out of the pit forms the main body 2111, and the top sealing part 2112, the side sealing part 2113 and the extension part 2114 are formed at the edge sealing.

[0054] In some embodiments, the first direction X is the same as the thickness direction of the battery cell 21 .

[0055] In some embodiments, Figure 2 As shown, the battery cell assembly 2 includes a circuit board 22, which is located on one side of the multiple battery cells 21. The circuit board 22 is provided with multiple openings 2201 and a bus 221. The pole ears 212 of two adjacent battery cells 21 pass through the openings 2201 and are connected to the bus 221 to make the two adjacent battery cells 21 conductively connected.

[0056] In some embodiments, the multiple battery cells 21 are connected in series. The positive polarity tab 212 of one of two adjacent battery cells 21 is connected to the negative polarity tab 212 of the other, thereby realizing the series connection between the multiple battery cells 21. In other embodiments, the tabs 212 of the multiple battery cells 21 are connected in parallel.

[0057] In some embodiments, Figure 4 and Fig. 9 As shown, the liquid cooling plate 3 includes a first plate body 31 and a second plate body 32 stacked and connected along the third direction Z, a flow channel 301 is provided between the first plate body 31 and the second plate body 32, and the first plate body 31 is connected to the battery cell assembly 2. The connection between the first plate body 31 and the second plate body 32 can be welding, riveting connection or bolt connection, and of course, other methods can be used as long as the first plate body 31 and the second plate body 32 can be sealed at the flow channel 301.

[0058] In some embodiments, Figure 4-6 As shown, the first plate body 31 includes a first base 311 and at least one first protrusion 312, each first protrusion 312 is protruded from the first base 311 toward the main body 2111, the first protrusion 312 is connected to each main body 2111 of the same battery cell assembly 2, and the first protrusion 312 is arranged between two extensions 2114 of the same battery cell 21 of the same battery cell assembly 2, and a flow channel 301 is arranged below the first protrusion 312. There is a height difference between the first protrusion 312 and the first base 311, which can be used to avoid the extension 2114, which is conducive to the contact between the first protrusion 312 and the main body 2111, reducing the distance of heat transfer between the main body 2111 and the liquid cooling plate 3, and is conducive to improving the cooling effect.

[0059] In some embodiments, along the third direction Z, the projection of each extension portion 2114 is separated from the projection of the first protrusion 312 . The projection of the extension portion 2114 is separated from the projection of the first protrusion 312 , which means that the extension portion 2114 is disposed at the side end of the first protrusion 312 .

[0060] In some embodiments, Figure 6 As shown, the first plate body 31 is provided with a liquid inlet hole 313 and a liquid outlet hole 314, and the liquid inlet hole 313 and the liquid outlet hole 314 are both connected to the flow channel 301. In some embodiments, the liquid inlet hole 313 and the liquid outlet hole 314 are both arranged on the same side of the first plate body 31. In some embodiments, the liquid inlet hole 313 and the liquid outlet hole 314 are located on opposite sides of the first plate body 31.

[0061] In some embodiments, Figure 5 As shown, the first plate body 31 is provided with a plurality of limiting portions 315 , and along the first direction X, the plurality of limiting portions 315 are provided on two sides opposite to the first protrusion 312 .

[0062] In some embodiments, Figure 7-8As shown, the second plate 32 is provided with a plurality of second protrusions 321 arranged at intervals along the first direction X, and the plurality of second protrusions 321 are all connected to the first protrusion 312. The first protrusion 312 forms a concave cavity 3121, and the plurality of second protrusions 321 are located in the concave cavity 3121. The plurality of second protrusions 321 arranged at intervals along the first direction X separate the space of the concave cavity 3121, which is conducive to separating the cooling medium into multiple streams of flowing liquid, prolonging the time for the cooling medium to flow in the flow channel 301, and is conducive to the cooling medium absorbing the heat transferred by the battery core assembly 2.

[0063] In some embodiments, Figure 7-8 As shown, a plurality of protrusions spaced apart along the first direction X constitute a row of second protrusions 321 , and the second plate 32 is provided with at least two rows of second protrusions 321 spaced apart along the second direction Y. In some embodiments, the cavity 3121 of each first protrusion 312 accommodates two rows of second protrusions 321 .

[0064] In some embodiments, the flow channel 301 includes at least two first flow channels 3011, there are at least two groups of battery cell assemblies 2, at least two groups of battery cell assemblies 2 are arranged at intervals along the second direction Y, there are at least two first protrusions 312, at least two first protrusions 312 are arranged at intervals along the second direction Y, one first protrusion 312 is connected to a group of battery cell assemblies 2, and a first flow channel 3011 is provided under each first protrusion 312.

[0065] In some embodiments, each first protrusion 312 is connected to at least one row of second protrusions 321 and constructs a first flow channel 3011 .

[0066] In some embodiments, Figure 7-9 As shown, the flow channel 301 includes at least one second flow channel 3012, and one second flow channel 3012 connects two adjacent first flow channels 3011. The second plate body 32 is provided with at least one recessed portion 322 along the third direction Z. Along the second direction Y, the projection of the recessed portion 322 is located between the projections of two adjacent first protrusions 312. A second flow channel 3012 is constructed between the recessed portion 322 and the first plate body 31, and the second flow channel 3012 connects two adjacent first flow channels 3011. Thus, the cooling medium will flow along one end of one of the first flow channels 3011 to the other end, and then flow into the other first flow channel 3011 through the second flow channel 3012, and flow along the first flow channel 3011, so as to complete the heat absorption of the cooling medium to the two groups of battery core assemblies 2 arranged on the two first protrusions 312, so as to reduce the temperature of the two groups of battery core assemblies 2.

[0067] In some embodiments, Figure 7 and Fig. 9As shown, the second plate 32 is provided with at least two third protrusions 323 protruding in the direction opposite to the third direction Z, at least two third protrusions 323 are arranged at intervals along the second direction Y, and at least one third protrusion 323 is arranged on both opposite sides of the recess 322, and each third protrusion 323 is located in the concave cavity 3121 of the first protrusion 312. And along the first direction X, the projection of the second protrusion 321 and the projection of the third protrusion 323 at least partially overlap. When the cooling medium flows along the first flow channel 3011 to the third protrusion 323, the flow direction is changed to flow to the second flow channel 3012 under the obstruction of the third protrusion 323, and flows along the second flow channel 3012 to another first flow channel 3011, which is conducive to improving the cooling efficiency of the cooling medium.

[0068] In some embodiments, Figure 7 and Fig. 9 As shown, there are three recesses 322 disposed between two adjacent first protrusions 312 , and the three recesses 322 are disposed at intervals along the first direction X. In some embodiments, along the second direction Y, three third protrusions 323 are disposed on opposite sides of each recess 322 .

[0069] In some embodiments, Figure 7 and Fig. 9 As shown, the number of the first protrusions 312 is four, and the four first protrusions 312 are arranged at intervals along the second direction Y. Along the third direction Z, the second plate body 32 is provided with at least one row of second protrusions 321 in the area where each first protrusion 312 is located, and the second plate body 32 is provided with a recess 322 in the area between two adjacent first protrusions 312. The recess 322 and the first plate body 31 form a second flow channel 3012, and the second flow channel 3012 is connected to two adjacent first flow channels 3011. In this way, the cooling medium flows in the four first flow channels 3011 in turn to absorb heat from the four groups of battery cell assemblies 2 connected to the four first protrusions 312 to reduce the temperature of the battery cell assemblies 2.

[0070] In some embodiments, Fig. 9 As shown, Fig. 9 The multiple arrows shown in the figure indicate the flow path of the cooling medium. The cooling medium can be cooling water, other cooling liquids or others, which can be selected according to needs.

[0071] In some embodiments, the second plate 32 is provided with a first protrusion 325 and a second protrusion 326 protruding along the third direction Z, and the first protrusion 325 and the second protrusion 326 are both adjacent to the first protrusion 312. The first protrusion 325 is provided with a first groove 3251, and the second protrusion 326 is provided with a second groove 3261. The first groove 3251 is connected to one end of the first flow channel 3011, and the second groove 3261 is connected to the other end of the same first flow channel 3011. The liquid inlet 313 is connected to the first groove 3251, and the liquid outlet 314 is connected to the second groove 3261. When the cooling medium enters the first groove 3251 through the liquid inlet 313, it will flow along the first groove 3251 to the first flow channel 3011, and finally flow out from the liquid outlet 314.

[0072] In other embodiments, Figure 7 and Figure 8 As shown, the second plate body 32 is provided with a first protrusion 325 and a second protrusion 326 protruding along the third direction Z, the first protrusion 325 is provided with a first groove 3251, and the second protrusion 326 is provided with a second groove 3261. The number of the first flow channels 3011 is four, the number of the second flow channels 3012 is three, and each two adjacent first flow channels 3011 are connected through a second flow channel 3012, so that the four first flow channels 3011 are connected in series. The first groove 3251 is connected to the first first flow channel 3011 of the four first flow channels 3011 connected in series, and the second groove 3261 is connected to the fourth first flow channel 3011 of the four first flow channels 3011 connected in series. The first plate body 31 is provided with a liquid inlet 313 and a liquid outlet 314, the liquid inlet is connected to the first groove 3251, and the liquid outlet 314 is connected to the second groove 3261. In this way, after the cooling medium enters the first groove 3251 through the liquid inlet hole 313 , it flows along the first groove 3251 through the four first flow channels 3011 connected in series, and flows out from the liquid outlet hole 314 .

[0073] In some embodiments, Figure 7 and Fig. 9 As shown, the second plate 32 is provided with at least two diverter grooves 327 recessed along the third direction Z, one end of each diverter groove 327 is communicated with the first groove 3251, and the other end of each diverter groove 327 is communicated with the first flow channel 3011. Under the action of at least two diverter grooves 327, the cooling medium will be separated into at least two flowing liquids, which is conducive to improving the absorption of heat of the battery core assembly 2.

[0074] In some embodiments, the second plate 32 is provided with at least two connecting grooves 328 recessed in the third direction Z, one end of each connecting groove 328 is connected to the second groove 3261, and the other end of each connecting groove 328 is connected to the first flow channel 3011. Under the action of the at least two connecting grooves 328, at least two streams of cooling medium will be collected in the second groove 3261 and flow out from the liquid outlet 314.

[0075] In some embodiments, Figure 7 As shown, a plurality of spaced support protrusions 329 are provided on a side of the second plate 32 away from the first plate 31. The plurality of support protrusions 329 are provided on the periphery of the second plate 32. The plurality of support protrusions 329 are used to strengthen the strength of the second plate 32 and to raise the height of the surface of the second plate 32 away from the first plate 31. The plurality of spaced support protrusions 329 are provided along a straight line.

[0076] In some embodiments, Figure 8 As shown, the second plate 32 is provided with a first convex strip 3210 extending along the first direction X, and the first convex strip 3210 is provided between two adjacent first protrusions 312, and the first convex strip 3210 is used to strengthen the strength of the second plate 32. In some embodiments, as Figure 8 As shown, the second plate body 32 is provided with at least one second convex strip 3211 extending along the second direction Y. Each second convex strip 3211 is located between the first convex block 325 and the second convex block 326 . The second convex strip 3211 is used to enhance the strength of the second plate body 32 .

[0077] In some embodiments, Fig.10 and Fig.12 As shown, the battery module 1 includes an insulating member 4, and the insulating member 4 includes a first portion 41, and the first portion 41 extends along the first direction X. The first portion 41 is connected to the battery cell assembly 2, one end surface of the first portion 41 is connected to the battery cell assembly 2, and the other end surface of the first portion 41 is connected to the first protrusion 312, and the first portion 41 is used to conduct the heat of the battery cell assembly 2 to the liquid cooling plate 3.

[0078] In some embodiments, Fig.10 and Fig.12 As shown, the first part 41 includes an abutting portion 411 and two recessed portions 412, and the two opposite sides of the abutting portion 411 are respectively connected to the two recessed portions 412, and the two recessed portions 412 are respectively located on the opposite sides of the first protrusion 312. An extension portion 2114 is located in a recessed portion 412. This is conducive to the contact between the first protrusion 312 and the main body 2111, which is conducive to the cooling medium absorbing the heat of the battery core assembly 2, and improving the heat dissipation efficiency of the liquid cooling plate 3.

[0079] In some embodiments, the insulating member 4 comprises a polycarbonate film.

[0080] In some embodiments, Fig.10 and Fig.12 As shown, the insulating member 4 includes a second portion 42 connected to the first portion 41, the second portion 42 is located on one side of the battery cell assembly 2 along the second direction Y, and the second portion 42 is connected to the side sealing portion 2113 of the same battery cell assembly 2. In this way, under the constraint of the second portion 42, it is beneficial to arrange multiple battery cells 21 along the first direction X, thereby improving the assembly efficiency of the battery cell assembly 2.

[0081] In some embodiments, the first portion 41 and the second portion 42 are perpendicular to each other when viewed along the first direction X. In some embodiments, the angle between the first portion 41 and the second portion 42 is less than 90° or greater than 90° when viewed along the first direction X.

[0082] In some embodiments, please refer again to Figure 2 The battery module 1 includes a bracket 5 and at least two end walls 6 connected to each other, the bracket 5 is fixed to the two end walls 6, and along the first direction X, a battery cell assembly 2 is located between the two end walls 6, and the end wall 6 is configured to limit the expansion of the battery cell assembly 2. Among them, at least part of the bracket 5 and the second part 42 are located on one side of the same battery cell assembly 2, and the insulating member 4 is located between the bracket 5 and the battery cell assembly 2. The provision of the bracket 5 and the end wall 6 is conducive to constraining the multiple battery cell assemblies 2, improving the stability of the multiple battery cell assemblies 2 arranged on the liquid cooling plate 3, reducing the risk of the multiple battery cell assemblies 2 moving on the surface of the liquid cooling plate 3, and improving the safety performance of the battery module 1.

[0083] In some embodiments, Figure 2 As shown, there are two brackets 5 , and the two brackets 5 are respectively located on both sides of the plurality of battery cell assemblies 2 spaced apart along the second direction Y.

[0084] In some embodiments, Figure 2 As shown, the bracket 5 includes a connected horizontal portion 51 and a vertical portion 52, the vertical portion 52 and the second portion 42 are located on one side of the same battery cell assembly 2, and at least one of the horizontal portion 51 and the vertical portion 52 is provided with a connecting portion 53, and the connecting portion 53 is fixed to the two end walls 6.

[0085] In some embodiments, both the horizontal portion 51 and the vertical portion 52 are provided with a connecting portion 53. In some embodiments, both the horizontal portion 51 and the vertical portion 52 are provided with connecting portions 53 at opposite ends along the first direction X, which is beneficial to improve the stability of the connection between the horizontal portion 51 and the vertical portion 52 and the end wall 6.

[0086] In some embodiments, Figure 2 and Figure 5 As shown, the bracket 5 is fixed to the limiting portion 315 , so that the bracket 5 is fixed to the first plate body 31 .

[0087] In some embodiments, a heat dissipation gap is provided between one end of the end wall 6 close to the first plate body 31 and the first plate body 31 , which is beneficial for the heat of the battery cell assembly 2 to be dissipated from the heat dissipation gap.

[0088] In some embodiments, Fig.11 As shown, the horizontal portion 51 extends along the second direction Y, and the vertical portion 52 extends along the third direction Z. Both the horizontal portion 51 and the vertical portion 52 are connected to the battery cell assembly 2 .

[0089] In some embodiments, Figure 2 As shown, the horizontal portion 51 includes two receiving grooves 511 and a flat portion 512 connected to the first protrusion 312, and a recessed portion 412 is located in one receiving groove 511. An end surface of the flat portion 512 facing away from the first protrusion 312 abuts against the abutting portion 411. This is conducive to the positioning and installation of the insulating member 4 and the bracket 5, and improves the assembly efficiency of the insulating member 4 and the bracket 5.

[0090] In some embodiments, please combine Figure 5 and Figure 6 The battery module 1 includes a liquid inlet connector 7 and a liquid outlet connector 8, both of which are connected to the liquid cooling plate 3 and communicate with the flow channel 301, and both of which are used to connect to the structure for supplying cooling medium. The provision of the liquid inlet connector 7 and the liquid outlet connector 8 is conducive to improving the efficiency of the connection, and facilitates the installer to connect the structure for supplying cooling medium to the liquid cooling plate 3. In some embodiments, the liquid inlet connector 7 is provided at the liquid inlet hole 313, and the liquid outlet connector 8 is provided at the liquid outlet hole 314.

[0091] In some embodiments, Figure 1 As shown, the battery module 1 includes a shell 9 , which is connected to the liquid cooling plate 3 to form a receiving cavity 901 , and the battery cell assembly 2 is located in the receiving cavity 901 .

[0092] In some embodiments, the bracket 5 and the end wall 6 are located in the accommodating cavity 901 .

[0093] In some embodiments, Figure 1 As shown, the liquid inlet connector 7 and the liquid outlet connector 8 are both arranged outside the accommodating cavity 901 , which is beneficial to reducing the risk of cooling medium leakage in the accommodating cavity 901 and reducing the adverse effects on the battery cell assembly 2 .

[0094] In some embodiments, Figure 1 As shown, the housing 9 includes a connected top wall 91 , the top wall 91 and the liquid cooling plate 3 are located on opposite sides of the battery cell assembly 2 , and the top wall 91 is disposed adjacent to the top sealing portion 2112 of the battery cell assembly 2 .

[0095] In some embodiments, the housing 9 includes an outer wall 92 connected to the top wall 91, and the outer wall 92 is disposed around the battery cell assembly 2. An end of the outer wall 92 close to the liquid cooling plate 3 is provided with a flange 921 connected to the first plate body 31, and the flange 921 is configured to extend on the surface of the first plate body 31.

[0096] In some embodiments, the battery module 1 includes a heat insulating member (not shown) located in the accommodating cavity 901, the heat insulating member is arranged on the top wall 91, and the thermal conductivity of the heat insulating member at 25°C is less than 0.04 (W / (m·K)). The heat insulating member reduces the temperature difference between the inside and outside of the accommodating cavity 901 and reduces condensation.

[0097] In some embodiments, the thermal insulation is foam.

[0098] In some embodiments, the foam glue is filled in the gap between the top wall 91 and the battery cell assembly 2 , which helps to reduce the risk of the battery cell assembly 2 moving along the third direction Z in the housing 9 and helps to improve the stability of the battery module 1 .

[0099] In some embodiments, the battery module 1 includes a conductive member 10, which is connected to the housing 9 and exposed outside the accommodating cavity 901, and is configured to be connected to an external device. In some embodiments, the conductive member 10 is provided with a plurality of connection terminals, which are used to connect to an external device.

[0100] The battery module 1 provided in the embodiment of the present application includes at least one battery cell assembly 2 and a liquid cooling plate 3, each battery cell assembly 2 includes a plurality of battery cells 21 arranged along a first direction X, and the side sealing portion 2113 of the battery cell 21 includes an extension portion 2114 extending beyond the main body 2111 in a third direction Z; the liquid cooling plate 3 includes a flow channel 301, and the liquid cooling plate 3 includes a first plate body 31 and a second plate body 32 stacked and connected along the third direction Z, the first plate body 31 includes a first base 311 and at least one first protrusion 312, each first protrusion 312 protrudes from the first base 311 toward the main body 2111, and the first protrusion 312 is connected to each main body 2111 of the same battery cell assembly 2, and the first protrusion 312 is arranged between the two extension portions 2114 of the two side sealing portions 2113 of the same battery cell 21 of the same battery cell assembly 2, and a flow channel 301 is provided below the first protrusion 312. This is beneficial for the battery cell 21 to abut against the first protrusion 312 , shortening the distance between the flow channel 301 and the main body 2111 of the battery cell 21 , and is beneficial for better absorption of heat from the battery cell 21 when cooling medium is passed into the flow channel 301 , thereby improving cooling efficiency.

[0101] Another embodiment of the present application provides an electrical device, which includes the battery module 1 in the above embodiment.

[0102] The above description is only an implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery module, characterized in that: include: At least one battery cell assembly, each battery cell assembly includes a plurality of battery cells arranged along a first direction, the battery cell includes a shell, an electrode assembly and a pole ear, the shell includes a main body, a top seal and two oppositely arranged side seals connected to each other, the electrode assembly is located in the main body, along the second direction, the two side seals are respectively located on both sides of the main body, the pole ear extends from the top seal, along the third direction, the side seal includes an extension beyond the main body, the first direction, the second direction and the third direction are perpendicular to each other; A liquid cooling plate, comprising a flow channel, wherein the liquid cooling plate comprises a first plate body and a second plate body stacked and connected along the third direction, wherein the first plate body comprises a first base and at least one first protrusion, each of the first protrusions protrudes from the first base toward the main body, the first protrusion is connected to each of the main bodies of the same battery cell assembly, the first protrusion is arranged between the two extensions of the same battery cell of the same battery cell assembly, and a flow channel is arranged below the first protrusion.

2. The battery module according to claim 1, characterized in that: The second plate body is provided with a plurality of second protrusions spaced apart along the first direction, the plurality of second protrusions are all protruding along a direction opposite to the third direction, and the plurality of second protrusions are all connected to the first protrusion.

3. The battery module according to claim 2, characterized in that: The flow channel includes at least two first flow channels and at least one second flow channel, the battery cell components include at least two groups, and the at least two groups of battery cell components are arranged at intervals along the second direction; There are at least two first protrusions, at least two of which are spaced apart along the second direction, one of which is connected to a group of the battery cell components, and the first flow channel is disposed below each of the first protrusions; Wherein, the second plate body is provided with at least one recessed portion sunken along the third direction, the recessed portion and the first plate body form the second flow channel, and one second flow channel is connected to two adjacent first flow channels; Along the second direction, the projection of the concave portion is located between the projections of two adjacent first protrusions.

4. The battery module according to any one of claims 1 to 3, characterized in that: The battery module includes an insulating member, the insulating member includes a first portion, and the first portion extends along the first direction; Wherein, the first part includes an abutting portion and two recessed portions, the opposite sides of the abutting portion are respectively connected to the two recessed portions, the two recessed portions are respectively located on the opposite sides of the first protrusion, and one of the extension portions is located in one of the recessed portions.

5. The battery module according to claim 4, characterized in that: The insulating member includes a second portion connected to the first portion, the second portion is located at one side of the battery cell assembly along the second direction, and the second portion is connected to a side sealing portion of the same battery cell assembly.

6. The battery module according to claim 5, characterized in that: The battery module comprises a bracket and at least two end walls, along the first direction, a battery cell assembly is located between the two end walls, the bracket and the two end walls are fixed, and the end walls are configured to limit the expansion of the battery cell assembly; At least a portion of the bracket and the second portion are located on one side of a same battery cell assembly, and the insulating member is located between the bracket and the battery cell assembly.

7. The battery module according to claim 6, characterized in that: The bracket includes a horizontal portion and a vertical portion connected to each other, the vertical portion and the second portion are located on one side of the same battery core assembly, at least one of the horizontal portion and the vertical portion is provided with a connecting portion, and the connecting portion is fixed to the two end walls; Wherein, the horizontal portion includes two receiving grooves and a flat portion connected to the first protrusion, and one of the recessed portions is located in one of the receiving grooves.

8. The battery module according to any one of claims 1 to 7, characterized in that: The battery module comprises a conductive member and a shell, wherein the shell is connected to the liquid cooling plate to form a receiving cavity; The battery cell assembly is located in the accommodating cavity; the conductive member is connected to the housing and exposed outside the accommodating cavity, and the conductive member is configured to be connected to an external device; The battery module includes a liquid inlet joint and a liquid outlet joint, wherein the liquid inlet joint and the liquid outlet joint are both arranged on the liquid cooling plate and communicated with the flow channel, and the liquid inlet joint and the liquid outlet joint are both located outside the accommodating cavity.

9. The battery module according to claim 8, characterized in that: The housing comprises a top wall, and the top wall and the liquid cooling plate are located on opposite sides of the battery core assembly; The battery module includes a heat insulating member located in the accommodating cavity, the heat insulating member is arranged on the top wall, and the thermal conductivity of the heat insulating member at 25° C. is less than 0.04 (W / (m·K)).

10. An electrical device, characterized in that: Comprising a battery module as described in any one of claims 1 to 9.

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