CN219801196U - Battery pack - Google Patents

Abstract

The utility model relates to a battery pack which comprises a battery box, a first insulating part and at least one group of battery cell groups, wherein each group of battery cell groups comprises at least two square battery cells which are distributed along a first direction, the end face of each battery cell group is provided with the first insulating part, the first insulating part is bonded with the end face of each battery cell group through a first bonding part, two adjacent square battery cells of each battery cell group are bonded through a second bonding part, and each battery cell group is directly fixed in the battery box through the first insulating part. The battery cell group of the battery pack is directly fixed in the battery box through the first insulating piece, so that the traditional end plate and steel belt structure is saved, the manufacturing cost of the battery pack, the weight of the battery pack and the volume of the battery pack are reduced, the energy density of the battery pack using the battery pack can be improved, the manufacturing process is reduced, and the yield of products is improved.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

The battery pack is widely applied to various electric vehicles as energy storage equipment. Currently, a battery pack includes a battery box and a battery module, and the battery module is disposed in the battery box. The battery module is formed by a plurality of square battery cells, end plates and steel belts, when the battery module is assembled, the plurality of square battery cells are required to be stacked to form a battery cell group, then the two end plates are arranged on two sides of the battery cell group so as to clamp the battery cell group through the end plates, then the two battery cell groups and the end plates are bound and fixed through the steel belts to form the battery module, and then the battery module is placed in a battery box to form a battery pack. The prior art has the following technical defects: 1. the weight of the steel belt and the end plate is heavy, and the battery pack with the structure can increase the overall weight of the battery pack; 2. the volume of the matching structure of the end plate and the steel belt is larger, the occupied installation space in the battery box is larger, and the energy density of the battery pack is reduced.

Disclosure of Invention

The aim of the embodiment of the utility model is that: provided is a battery pack having a simple structure, a light weight, and a small volume.

To achieve the purpose, the embodiment of the utility model adopts the following technical scheme:

the utility model provides a battery package, including battery box, first insulating part and at least a set of electric core group, every group the electric core group all includes two at least square electric cores of arranging along first direction, the terminal surface of electric core group is provided with first insulating part, first insulating part through first bonding part with the terminal surface bonding of electric core group, two adjacent of electric core group bond through the second bonding part between the square electric core, electric core group passes through first insulating part is directly fixed in the battery box.

As a preferred scheme of the battery pack, the battery cell groups are at least two groups, a second insulating piece is arranged between every two adjacent battery cell groups, and the second insulating piece is bonded with the battery cell groups through a third bonding piece.

As a preferred scheme of battery package, the electric core group have with the first side that the second insulating part pasted, the electric core group has two second sides of arranging along the second direction, the second side with first side is connected and is the contained angle setting, one of them the second side sets up the busbar of connection square electric core.

As a preferred scheme of the battery pack, the two end faces of the battery cell group, which are arranged along the first direction, are respectively provided with the first insulating piece, and the second insulating pieces positioned between two adjacent battery cell groups are connected with the first insulating pieces positioned at the two ends of the battery cell group.

As a preferable mode of the battery pack, the first insulating member and/or the second insulating member is an insulating sheet, and the thickness of the insulating sheet is 2mm-4mm.

As a preferable mode of the battery pack, the first adhesive member and/or the second adhesive member and/or the third adhesive member is an adhesive layer, and the thickness of the adhesive layer is 2mm-4mm.

As a preferred scheme of the battery pack, a plurality of glue containing grooves are concavely formed in a side surface, connected with the first adhesive piece, of the first insulating piece, and the first adhesive piece is partially arranged in the glue containing grooves;

and/or a plurality of glue containing grooves are concavely arranged on one side surface of the second insulating piece, which is connected with the third bonding piece, at intervals, and the third bonding piece is partially arranged in the glue containing grooves.

As a preferred scheme of the battery pack, at least part of the groove walls of the glue containing groove are obliquely arranged towards the center away from the glue containing groove.

As a preferred scheme of the battery pack, buffer members are arranged at two end faces of the battery cell group, which are arranged along the first direction.

As a preferred scheme of the battery pack, the battery box comprises a lower box body, the lower box body is provided with at least one mounting groove, the battery cell group and the first insulating piece are arranged in the mounting groove, and the first insulating piece and/or the battery cell group is/are bonded with the groove wall of the mounting groove.

As a preferred scheme of battery package, lower box includes frame and liquid cooling board, the frame is inside to have installation space, the liquid cooling board sets up one side of frame is in order to form the mounting groove, square electric core is the cube, square electric core has two first faces that set up relatively and two second faces that set up relatively, first face with the second face all with the electric core sets up the one side of busbar and personally submits the contained angle and be connected, is located the first side of square electric core of electric core group one end is provided with first insulating part, the second face with be provided with fourth bonding part between the frame.

As a preferred scheme of the battery pack, a boss is convexly arranged on the groove wall of the mounting groove, and the fourth bonding piece is arranged between the second surface and the boss;

and the distance between the side surface, away from the liquid cooling plate, of the fourth bonding piece and the liquid cooling plate is L1, and the distance between the side surface, away from the liquid cooling plate, of the boss and the liquid cooling plate is L2, wherein L1 is less than or equal to L2.

As a preferred scheme of battery package, be provided with the crossbeam in the installation space, the opposite ends of crossbeam with the frame coupling, the crossbeam will the installation space is separated into two at least mounting groove, the crossbeam includes the roof beam main part, the lateral wall of roof beam main part is adjacent the one end of liquid cooling board is provided with the boss.

The embodiment of the utility model has the beneficial effects that: this battery package bonds two at least square electric core through the second bonding piece and forms electric core group, set up first insulating part at the terminal surface of electric core group, and bond first insulating part and electric core group through first bonding piece, then electric core group is direct to be fixed in the battery box through first insulating part in order to form the battery package of no modularity, need not to use traditional end plate and steel band structure to bind a plurality of square electric core in advance and form battery module, the structure of whole battery package has been simplified, the manufacturing cost of battery package, the weight of battery package and the volume of battery package can improve the energy density of this battery package, manufacturing procedure has been reduced, the yield of product has been promoted.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic exploded view of a battery pack according to an embodiment of the utility model.

Fig. 2 is a cross-sectional view of a battery pack according to an embodiment of the present utility model.

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a schematic structural diagram of a plurality of battery cell groups according to an embodiment of the present utility model.

Fig. 5 is a schematic diagram illustrating disassembly of multiple groups of battery cells according to an embodiment of the utility model.

Fig. 6 is a cross-sectional view of a first insulator according to an embodiment of the present utility model.

Fig. 7 is a cross-sectional view of a second insulator according to an embodiment of the present utility model.

In the figure:

1. a cell group; 11. a square cell; 12. a second side; 21. a first insulating member; 22. a second insulating member; 23. a glue containing groove; 31. a first adhesive member; 32. a third adhesive member; 33. a fourth adhesive member; 4. a buffer member; 5. a busbar; 6. a battery box; 61. a lower box body; 611. a frame; 612. a liquid cooling plate; 613. thermally conductive silica gel; 614. a mounting groove; 615. a cross beam; 6151. a beam body; 6152. a boss; 62. a cover body; 7. and (5) a bottom guard board.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The battery pack is widely applied to various electric vehicles as energy storage equipment. Currently, a battery pack includes a battery box and a battery module, and the battery module is disposed in the battery box. The battery module is formed by a plurality of square battery cells, end plates and steel belts, when the battery module is assembled, the plurality of square battery cells are required to be stacked to form a battery cell group, then the two end plates are arranged on two sides of the battery cell group so as to clamp the battery cell group through the end plates, then the two battery cell groups and the end plates are bound and fixed through the steel belts to form the battery module, and then the battery module is placed in a battery box to form a battery pack. The prior art has the following technical defects: 1. the weight of the steel belt and the end plate is heavy, and the battery pack with the structure can increase the overall weight of the battery pack; 2. the volume of the matching structure of the end plate and the steel belt is larger, the occupied installation space in the battery box is larger, and the energy density of the battery pack is reduced.

In order to solve the above technical problems, as shown in fig. 1 and 5, the present utility model provides a battery pack, which includes a battery box 6, a first insulating member 21 and at least one group of battery cells 1, wherein each group of battery cells 1 includes at least two square battery cells 11 arranged along a first direction, the end surface of the battery cell 1 is provided with the first insulating member 21, the first insulating member 21 is bonded to the end surface of the battery cell 1 through a first bonding member 31, two adjacent square battery cells 11 of the battery cell 1 are bonded through a second bonding member, and the battery cell 1 is directly fixed in the battery box 6 through the first insulating member 21. This battery package bonds two at least square electric core 11 through the second bonding piece and forms electric core group 1, set up first insulating part 21 at the terminal surface of electric core group 1, and bond first insulating part 21 through first bonding part 31 and electric core group, then electric core group 1 is direct to be fixed in battery box 6 through first insulating part 21 in order to form the battery package of no modularity, need not to use traditional end plate and steel band structure to bind a plurality of square electric core 11 in advance and form the battery module, the structure of whole battery package has been simplified, the manufacturing cost of battery package, the weight of battery package and the volume of battery package can be improved, manufacturing procedure has been reduced, the yield of product has been promoted.

It is understood that at least two square cells 11 means that two, three, four or other numbers of square cells may be provided within a group 1 of cells.

It should be noted that, as shown in fig. 5, the X-axis points in the first direction in the coordinate system.

The square battery cell 11 may be a cylindrical square battery cell, a directional square battery cell or other special-shaped square battery cells. For clarity of explanation of the battery pack structure, a battery pack composed of square-square cells will be described in detail below.

Optionally, the first insulating member 21 is bonded to the battery box 6, and the design does not need to provide a connection structure on the battery box 6, so that damage to the battery box 6 can be reduced, and the bonding is convenient for mounting the battery cell group 1 in the battery box 6. In other embodiments, the first insulating member 21 and the battery box 6 may be connected by a clamping, fastening or other manners, which is not limited to this embodiment.

In this embodiment, as shown in fig. 5, the battery cell groups 1 are arranged in at least two groups, and a second insulating member 22 is disposed between two adjacent battery cell groups 1 to insulate the sidewalls of the battery cell groups 1 from each other, so as to prevent short circuits between the battery cell groups. A third adhesive 32 is provided between the second insulating member 22 and the cell stack 1. The second insulating piece 22 is adhered to the cell groups 1 through the third adhesive piece 32, so that two adjacent cell groups 1 can be adhered to each cell group 1 through the second insulating piece 22 and the third adhesive piece 32 to form a battery module, and the stability of the battery module in the battery box 6 is higher.

Specifically, a terminal is disposed on one end face of each square battery cell 11, and the terminal of each two adjacent square battery cells 11 is connected through a bus bar 5, so that each square battery cell 11 in the battery cell group 1 is connected in series or in parallel, and the bus bar 5 is connected with the terminal in a welding manner, so that the bus bar 5 can play an auxiliary fixing role on the two adjacent square battery cells. The second insulating member 22 or a side surface of the second insulating member 22, on which no pole is arranged, of the square battery cell 11 is connected, so that the insulating member and the busbar 5 can jointly fix the battery cell group 1, and the stability of the battery cell group 1 is improved. In this embodiment, the pole and the explosion-proof valve are both disposed on the top of the square battery cell 11 along the second direction. Optionally, the busbar 5 is an aluminum row, which is made of Al1060O material, and the aluminum row has lighter weight and good conductivity.

Specifically, as shown in fig. 4 and 5, the battery cell group 1 has a first side surface adhered to the second insulating member 22, the battery cell group 1 has two second side surfaces 12 arranged along a second direction, the second direction is disposed at an angle to the first direction, the second side surfaces 12 are connected to the first side surfaces and disposed at an angle, and one of the second side surfaces 12 is disposed with a busbar 5 connected to the square battery cell 11. In this embodiment, the second side 12 is perpendicular to the first side, the poles of the square battery cells 11 are located on the second side 12, and the poles on the second side 12 are welded by the bus bars 5, so that each square battery cell 11 in the battery cell group 1 can be fixed in an auxiliary manner by the bus bars 5. It should be noted that, as shown in fig. 2, the Z-axis points in the second direction in the coordinate system.

Of course, in order to achieve the electrical connection of the adjacent two sets of square cells 11, the adjacent two sets of cell sets 1 are connected by the bus bar 5.

Specifically, the square cell 11 has two first faces and two second faces disposed opposite to each other. The first face and the second face are connected with one side surface provided with the busbar through an included angle, in this embodiment, in a group of electric core groups 1, all the square electric cores 11 are located on the first face of the same side to form a first side surface of the electric core group 1, wherein the square electric cores are cubes, the first face is a narrow side surface, and the second face is a wide side surface. Of course, in other embodiments, the first face may be a wide side and the second face a narrow side. It can be understood that the wide side surface refers to a surface with larger side wall area of the square battery cell 11; the narrow side faces refer to the sides of the square cells 11 having a relatively small area. In some embodiments, the square cell 11 has a square structure, so that the areas of the first and second faces are equal.

In this embodiment, the second insulating member 22 can cover the first side, in other words, the second insulating member 22 located between two adjacent groups of the battery cell groups 1 covers the first sides of all the square battery cells 11 in one group of the battery cell groups 1, and the third adhesive members 32 are disposed on one side of the second insulating member 22 facing the battery cell groups 1.

In this embodiment, the square battery core 11 is a lithium iron phosphate square battery core, the outer shell of the square battery core 11 is three-series aluminum, and a core-in-package structure is arranged inside the shell. In other embodiments, the square battery cell 11 may be other types of batteries, which is not limited to the present embodiment.

In this embodiment, in order to further improve stability of the battery pack, as shown in fig. 2, all the battery cell groups 1 are arranged along the third direction, the third direction is set at an included angle with the first direction, the two end faces of the battery cell groups 1 arranged along the first direction are all provided with the first insulating member 21, and the first insulating member 21 covers the square battery cells 11 of the two adjacent battery cell groups 1, so that the first insulating member 21 can be bonded with the square battery cells 11 of the two adjacent battery cell groups 1 through the second bonding member 3, and adhesion between the two battery cell groups 1 is increased, thereby improving connection stability of the battery pack. Further, the second insulating members 22 between two adjacent groups of the battery cell groups 1 are connected with the first insulating members 21 at two ends of the battery cell groups 1, so that an I-shaped structure is formed between the two first insulating members 21 and the second insulating members 22, and the stability of the battery pack is greatly improved due to the mutual connection of the two first insulating members 21 and the second insulating members 22. Preferably, the first direction, the second direction and the third direction are perpendicular to each other, and it should be noted that, in the coordinates of the drawing, the Y axis points to the third direction.

Optionally, the first insulating member 21 and the second insulating member 22 are bonded to facilitate battery pack processing and assembly.

In some embodiments, the two second insulating members 22 and the first insulating member 21 are integrally formed, so that the stability of the integrally formed structure is high, and the stability of the battery pack can be improved.

In another embodiment, this embodiment differs from the other embodiments in that: the arrangement modes of the battery cell groups 1 are different, all the battery cell groups 1 in the embodiment are arranged in a matrix, the battery pack comprises N rows of the battery cell groups 1 and M columns of the battery cell groups 1, wherein N and M are both greater than or equal to 2, and a second insulating piece 22 is arranged between any two adjacent battery cell groups 1, so that the battery cell groups 1 of the two adjacent battery cells can be bonded and fixed through the second insulating piece 22.

For example, the battery pack 1 is provided with four groups, where n=2 and m=2, so that the battery pack has two rows and two columns of the battery packs 1, the two rows of the battery packs 1 are arranged along the first direction, the two columns of the battery packs 1 are arranged along the third direction, and the second insulating members 22 are disposed between the adjacent two groups of the battery packs 1, so that several second insulating members 22 are connected to form a cross structure, and the stability is higher. In other embodiments, the battery cell group 1 may further include six groups, eight groups, or other numbers, which is not limited to the present embodiment.

In the present embodiment, the first insulating member 21 and the second insulating member 22 are identical in structure to facilitate production and manufacture, thereby reducing manufacturing costs. In other embodiments, the first insulating member 21 and the second insulating member 22 are different in structure, and the specific thickness or size thereof may be designed according to the actual implementation.

Preferably, the first insulating member 21 and the second insulating member 22 are each an insulating sheet having a thickness of 2mm to 4mm. The insulating sheet can be ensured to have certain strength within the thickness range, so that the connection between the battery cell groups 1 is ensured to be stable, and the weight of the battery pack cannot be increased due to excessive thickness. In some embodiments, the thickness of the insulating sheet may be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., although the actual thickness of the insulating sheet may be designed as desired.

In this embodiment, the thickness of each insulating sheet is the same, and the insulating sheets with the same thickness are adopted, so that the manufacturing difficulty can be reduced, and the manufacturing cost can be reduced. In other embodiments, different thickness designs may be used for the insulating sheets in different locations.

Alternatively, the first insulating member 21 and the second insulating member 22 are made of a PC material, also called polycarbonate, which has excellent flame retardant and antioxidant properties.

Alternatively, the first adhesive member 31 and the second adhesive member are both adhesive layers, and the thickness of the adhesive layers is 2mm to 4mm. The adhesive layer can ensure that the adhesive layer has larger adhesive force within the thickness range so as to ensure that the connection between the battery cell groups 1 is stable, and the weight of the battery pack cannot be increased due to excessive thickness. In some embodiments, the thickness of the adhesive layer may be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc., although the actual thickness of the adhesive layer may be designed as desired. In other embodiments, the first adhesive member 31 and the second adhesive member may be separate adhesive structures, such as double sided tape, and the protective paper on the double sided tape may be torn to adhere the opposite sides of the double sided tape to the sides of the insulating sheet and the square battery cell 11 during use.

Alternatively, the first adhesive member 31 and the second adhesive member are made of a structural adhesive material. The structural adhesive has high strength (the compression strength is more than 65MPa, the steel-steel forward pulling bonding strength is more than 30MPa, the shear strength is more than 18 MPa), can bear larger load, is ageing-resistant, fatigue-resistant and corrosion-resistant, has stable performance in the expected service life, is suitable for bearing strong structural member bonding, and has lower heat conductivity coefficient. In the assembly process, the structural adhesive can be coated on the insulating sheet to form an adhesive layer on the insulating sheet, and then the adhesive layer is adhered to the square battery cell 11 to realize the adhesive function between the insulating sheet and the square battery cell 11.

In some embodiments, a structural adhesive may be injected between the insulating sheet and the square cells 11 so that an adhesive layer is formed between the insulating sheet and the square cells 11.

In order to further improve the stability of the battery pack, as shown in fig. 6, a plurality of glue containing grooves 23 are concavely formed in a side surface of the first insulating member 21 connected with the first adhesive member 31 at intervals, and the first adhesive member 31 is partially arranged in the glue containing grooves 23, so that the contact area between the first adhesive member 31 and the first insulating member 21 is larger, the adhesion force of the first adhesive member 31 to the first insulating member 21 is increased, and the connection stability between the first insulating member 21 and the square battery cell 11 is improved.

Optionally, as shown in fig. 7, a plurality of glue containing grooves 23 are concavely formed on a side surface of the second insulating member 22 connected with the third bonding member 32 at intervals, and the third bonding member 32 is partially disposed in the glue containing grooves 23, so that the contact area between the third bonding member 32 and the second insulating member 22 is larger, the adhesion between the third bonding member 32 and the second insulating member 22 is increased, and the connection stability between the second insulating member 22 and the third bonding member 32 is increased, so that the stability between two adjacent groups of battery cell groups 1 is improved.

Preferably, as shown in fig. 3, at least part of the groove wall of the glue containing groove 23 is inclined towards the center far away from the glue containing groove 23, when structural glue is injected into the glue containing groove 23 and cured in the glue containing groove 23, the inclined groove wall in the glue containing groove 23 limits the cured structural glue, so that the adhesive layer is limited to be pulled and fall off by force along the thickness direction of the insulating sheet, the connection stability between the adhesive layer and the insulating sheet is improved, and the stability between the battery pack is higher.

In an embodiment, as shown in fig. 6, the cross section of the glue containing groove 23 is a dovetail groove, in this structure, two adjacent side walls of the glue containing groove 23 are all inclined, and two convex sharp corners are formed between the groove bottom and the groove wall of the dovetail groove, when the structural glue is injected into the bottom of the dovetail groove, the two sharp corners can limit the solidified structural glue, so as to prevent the adhesive layer from falling off. In another embodiment, as shown in fig. 7, the cross section of the glue groove 23 is formed by combining a rectangle and a triangle, and one side of the triangle is inclined towards the center away from the glue groove 23.

In this embodiment, as shown in fig. 5, the buffer members 4 are disposed at two end faces of the cell group 1 arranged along the first direction, specifically, the buffer members 4 are disposed on the second side faces 12 of the square cells 11 located at two sides, and the buffer members 4 are located between the first adhesive member 31 and the square cells 11, in other words, the first adhesive member 31 may adhere the buffer members 4 to the square cells, and the buffer members 4 may provide a pre-tightening force when the battery is packaged in the battery box 6. It will be appreciated that when the battery pack is packed, the manipulator draws and clamps the battery pack, and the buffer member 4 can buffer the clamping force to prevent the square battery cell from being damaged, and when the buffer member 4 is clamped when the battery pack is packed, the buffer member 4 contracts, and the volume of the corresponding battery pack becomes smaller, so that the battery pack is packed into the battery box 6. When the manipulator releases the battery pack, the compressed volume of the buffer member 4 automatically expands to be abutted against the battery box 6, so that the pre-tightening force is provided for the battery pack.

Optionally, the buffer 4 is two tampons arranged at intervals on the second side 12 of the square cell.

Optionally, the tampon is made of XPP or MPP material.

In some embodiments, two foam strips are disposed on the second side 12 at intervals, so that a glue guiding groove is formed between the two foam strips, and in the glue injection process, the foam strips can guide and limit the structural glue, so as to prevent the structural glue from overflowing in the glue injection process.

In the present embodiment, the battery case 6 includes the cover 62 and the lower case 61, the lower case 61 has the mounting groove 614, and the cover 62 is provided at the notch of the mounting groove 614 to form the mounting cavity for mounting the battery cell group 1.

Alternatively, the cover 62 may be made of any one of aluminum, steel, SMC composite, or Phase Change Material (PCM). The SMC composite material is one of glass fiber reinforced plastics, and has absolute sealing waterproof performance, corrosion resistance and electricity larceny prevention performance.

Preferably, the square battery cells 11 of the battery cell group 1 are adhered to the groove walls of the mounting groove 614 through the adhesive pieces 3, so that stability between the battery cell group 1 and the battery box 6 is improved, and the battery cell group 1 is prevented from accidentally sliding in the battery box 6.

Specifically, as shown in fig. 1, the lower case 61 includes a frame 611 and a liquid cooling plate 612, the frame 611 has an installation space, the liquid cooling plate 612 is disposed on a side surface of the frame 611 to form an installation groove 614, the first side surface of the square battery 11 located at one end of the battery cell group is provided with the first insulating member 21, and the second surface of the square battery 11 is adhered to the frame 611, so that a part of the weight of the battery cell group 1 acts on the frame 611, so that the weight of the battery cell group 1 borne by the liquid cooling plate 612 is reduced. The liquid cooling plate 612 is used for cooling the battery cell group 1, so that the whole battery pack can be at a proper temperature.

Optionally, the liquid cooling plate 612 and the frame 611 are welded by friction stir welding or penetration welding, so that the installation strength of the liquid cooling plate 612 can be effectively ensured, and the capability of bearing the battery cell group is improved.

Optionally, a heat-conducting silica gel 613 is disposed between the liquid cooling plate 612 and the battery cell group 1 to improve the heat exchange efficiency between the battery pack and the liquid cooling plate 612, thereby improving the heat dissipation efficiency of the battery cell group 1. The heat conductive silica gel 613 is polyurethane material, and its heat conductivity is usually 1-3 w/m.k.

Specifically, the frame 611 is a main bearing component, and is generally made of Al6061-T6, which has better mechanical properties.

In some embodiments, as shown in fig. 2 and 3, the slot wall of the mounting slot 614 is convexly provided with a boss 6152, and a fourth bonding piece 33 is arranged between the second surface of the square battery cell and the boss 6152; and the distance between the side surface of the fourth adhesive member 33 far from the liquid cooling plate 612 and the liquid cooling plate 612 is L1, and the distance between the side surface of the boss 6152 far from the liquid cooling plate 612 and the liquid cooling plate 612 is L2, L1 is less than or equal to L2, so that the height of the fourth adhesive member 33 does not exceed the height of the boss 6152. When l1=l2, the boss 6152 and the fourth adhesive member 33 are disposed at a side surface level away from the liquid cooling plate 612, so that the adhesive area between the fourth adhesive member 33 and the boss 6152 is larger, thereby increasing the adhesive area between the square battery cell 11 and the boss 6152 and ensuring the stability of the battery pack. When L1 is smaller than L2, the meeting area of the fourth bonding piece 33 can be reduced, so that the use of structural adhesive is reduced, and the manufacturing cost is further reduced.

Specifically, as shown in fig. 3, a cross beam 615 is disposed in the installation space, opposite ends of the cross beam 615 are connected with the frame 611, the cross beam 615 partitions the installation space into at least two installation grooves 614, wherein the cross beam 615 can enhance the strength of the lower case 61 and is used for locking the liquid cooling plate 612. Specifically, the beam 615 includes a beam main body 6151, one end of the beam main body 6151 adjacent to the liquid cooling plate 612 is provided with a boss 6152, and the height of the boss 6152 is lower than that of the beam main body 6151, so that the beam 615 has an L-shaped structure; when the battery cell group 1 is disposed on both sides of the cross beam 615, the bosses 6152 are disposed on both sides of the beam body 6151, so that the cross beam 615 has a T-shaped structure.

Specifically, as shown in fig. 1, a bottom guard plate 7 is disposed at the bottom of the lower case 61, and the bottom guard plate 7 is located on a side surface of the liquid cooling plate 612 facing away from the cover 62, so as to protect the liquid cooling plate 612. Alternatively, the bottom guard 7 is made of DP590 high strength steel.

Specifically, the bottom of the lower case 61 is provided with a bottom guard 7, and the bottom guard 7 is located on a side surface of the liquid cooling plate 612 facing away from the cover 62, so as to protect the liquid cooling plate 612. Alternatively, the bottom guard 7 is made of DP590 high strength steel.

In the description herein, it should be understood that the terms "upper," "lower," and the like are used for convenience in description and simplicity of operation only, and are not necessarily indicative or implying any particular orientation, configuration or operation of such apparatus or elements herein, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the term "an embodiment" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present utility model is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the utility model and should not be taken in any way as limiting the scope of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (13)

1. The utility model provides a battery package, its characterized in that includes battery box, first insulating part and at least a set of electric core group, every group the electric core group all includes two at least square electric cores of arranging along first direction, the terminal surface of electric core group is provided with first insulating part, first insulating part through first bonding part with the terminal surface bonding of electric core group, two adjacent of electric core group bond through the second bonding part between the square electric core, electric core group passes through first insulating part direct fixation is in the battery box.

2. The battery pack according to claim 1, wherein the cell groups are arranged in at least two groups, a second insulating member is arranged between two adjacent cell groups, and the second insulating member and the cell groups are bonded through a third bonding member.

3. The battery pack according to claim 2, wherein the cell group has a first side surface adhered to the second insulating member, the cell group has two second side surfaces arranged in a second direction, the second side surfaces are connected to the first side surfaces and are disposed at an angle, and one of the second side surfaces is disposed with a bus bar connected to the square cell.

4. The battery pack according to claim 2, wherein the first insulating members are provided on both end surfaces of the cell groups arranged in the first direction, and the second insulating members located between two adjacent cell groups are connected to the first insulating members located on both ends of the cell groups.

5. The battery pack according to any one of claims 2 to 4, wherein the first insulating member and/or the second insulating member is an insulating sheet having a thickness of 2mm to 4mm.

6. The battery pack according to any one of claims 2 to 4, wherein the first adhesive member and/or the second adhesive member and/or the third adhesive member is an adhesive layer having a thickness of 2mm to 4mm.

7. The battery pack according to any one of claims 2 to 4, wherein a plurality of glue containing grooves are concavely formed in a side surface of the first insulating member connected with the first adhesive member at intervals, and the first adhesive member is partially arranged in the glue containing grooves;

and/or a plurality of glue containing grooves are concavely arranged on one side surface of the second insulating piece, which is connected with the third bonding piece, at intervals, and the third bonding piece is partially arranged in the glue containing grooves.

8. The battery pack of claim 7, wherein at least a portion of the walls of the glue well are inclined away from the center of the glue well.

9. The battery pack according to any one of claims 1 to 4, wherein a buffer member is provided at both end faces of the cell group arranged in the first direction.

10. The battery pack of any one of claims 1-4, wherein the battery case comprises a lower case having at least one mounting groove, the cell stack and the first insulating member are both disposed in the mounting groove, and the first insulating member and/or the cell stack is bonded to a groove wall of the mounting groove.

11. The battery pack according to claim 10, wherein the lower case includes a frame and a liquid cooling plate, the frame has an installation space therein, the liquid cooling plate is disposed on a side surface of the frame to form the installation groove, the square battery cell is a cube, the square battery cell has two oppositely disposed first surfaces and two oppositely disposed second surfaces, the first surfaces and the second surfaces are both connected with one side surface of the battery cell arrangement busbar by an included angle, the first insulating member is connected with the first surfaces of the square battery cells disposed on both sides of the battery cell group, and a fourth adhesive member is disposed between the second surfaces and the frame.

12. The battery pack according to claim 11, wherein a boss is provided protruding from a wall of the mounting groove, and the fourth adhesive is provided between the second face and the boss;

and the distance between the side surface, away from the liquid cooling plate, of the fourth bonding piece and the liquid cooling plate is L1, and the distance between the side surface, away from the liquid cooling plate, of the boss and the liquid cooling plate is L2, wherein L1 is less than or equal to L2.

13. The battery pack according to claim 12, wherein a cross member is provided in the installation space, opposite ends of the cross member are connected to the frame, the cross member partitions the installation space into at least two of the installation grooves, the cross member includes a beam body, and a side wall of the beam body is provided with the boss adjacent to one end of the liquid cooling plate.