Battery assembly and battery pack

Abstract

The application discloses a battery assembly and a battery pack in the field of energy storage devices, and relates to a battery assembly and a battery pack, which comprise a battery cell and a busbar, the busbar is provided with a plug-in slot, and the battery cell is provided with a pole that is plugged into the plug-in slot; when the pole of the battery assembly is inserted into the plug-in slot, two opposite slot walls of the plug-in slot elastically clamp the pole. The battery assembly of the application is simple and fast in replacement of the battery cell by optimizing the connection mode of the battery cell and the busbar.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage devices, in particular to a battery assembly and a battery pack. BACKGROUND

[0002] The existing battery pack includes two structures, one of which is to assemble a plurality of battery cells into a module in advance, and then assemble a plurality of modules into a battery pack; the other is to directly assemble battery cells into a battery pack. In the above two battery packs, the pole and the busbar are welded, and before replacing the single battery cell, the welded part must be disassembled, and then the single battery cell can be taken out and a new single battery cell can be installed.

[0003] In the prior art, the welded part needs to be disassembled before the single battery cell can be replaced, which makes the replacement of the single battery cell more complex, is not conducive to the quick replacement of the single battery cell, and is not conducive to the after-sales maintenance of the battery pack.

[0004] Therefore, it is necessary to design a battery assembly and a battery pack which can effectively realize the quick replacement of the single battery cell in the battery pack. SUMMARY

[0005] The purpose of the present application is to provide a battery assembly and a battery pack which can effectively realize the quick replacement of the single battery cell in the battery pack.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] A battery assembly includes a battery cell and a busbar, the busbar has a plug-in slot, and the battery cell has a pole which is plug-in connected with the plug-in slot;

[0008] When the pole of the battery assembly is inserted into the plug-in slot, the two opposite side walls of the plug-in slot elastically clamp the pole.

[0009] Optionally, the busbar is provided with a plurality of plug-in slots, and the pole has a plurality of plug-in parts corresponding to the plurality of plug-in slots.

[0010] Optionally, the pole further includes an abutting table part connected with the plug-in part; the abutting table part has a table surface facing the busbar, and the plug-in part is arranged on the table surface;

[0011] The busbar has a fitting surface for facing the table surface, and the fitting surface is provided with a conductive layer; when the pole is inserted into the plug-in slot, the two opposite sides of the conductive layer respectively fit the fitting surface and the table surface.

[0012] Optionally, the plug-in part is a strip-shaped protrusion, and adjacent two strip-shaped protrusions are parallel to each other.

[0013] Optionally, the strip-shaped protrusion is in the shape of a long strip plate, and includes opposite first and second abutting surfaces for abutting against opposite side walls of the insertion slot.

[0014] Optionally, the insertion slot is a groove.

[0015] Optionally, a cross section of the insertion slot along an extension direction of the insertion slot is in the shape of a rectangle, a T, a sector or a trapezoid.

[0016] Optionally, the insertion slot is smoothly transitioned between a bottom and a wall.

[0017] Optionally, one of the pole posts includes at least two strip-shaped protrusions.

[0018] Optionally, the busbar includes a connecting plate portion and a curved portion forming the insertion slot, and the connecting plate portion connects the curved portion.

[0019] Optionally, the battery assembly further includes a heat exchange plate and an insulating layer arranged on a bottom surface of the busbar.

[0020] The busbar is fixedly connected with the heat exchange plate, and the insulating layer at least partially adheres to the heat exchange plate.

[0021] Optionally, the heat exchange plate is provided with a mounting groove for accommodating the curved portion, a bottom surface of the curved portion adheres to a groove bottom of the mounting groove, and the connecting plate portion adheres to a top surface of the heat exchange plate.

[0022] Optionally, the busbar is provided with at least two curved portions, and the connecting plate portion connects two adjacent curved portions.

[0023] The heat exchange plate is provided with at least two mounting grooves corresponding to the at least two curved portions, and positions of the mounting grooves correspond to positions of the corresponding curved portions; a first strip-shaped heat exchange portion is formed between two adjacent mounting grooves, and a first heat exchange medium flow channel is arranged inside the first strip-shaped heat exchange portion.

[0024] A heat conduction component is arranged between the first strip-shaped heat exchange portion and the adjacent connecting plate portion, and opposite side surfaces of the heat conduction component abut against the first strip-shaped heat exchange portion and the connecting plate portion, respectively.

[0025] Optionally, the heat conduction component is a heat conduction pad or a heat conduction adhesive layer coated on the first strip-shaped heat exchange portion.

[0026] Optionally, the heat exchange plate further includes a second strip-shaped heat exchange portion, and a second heat exchange medium flow channel is arranged inside the second strip-shaped heat exchange portion.

[0027] An insulating and heat-conducting layer is arranged between the second strip-shaped heat exchange part and the top cover of the battery cell, and opposite sides of the insulating and heat-conducting layer are attached to the second strip-shaped heat exchange part and the shell, respectively.

[0028] Optionally, the busbar is integrally formed by stamping.

[0029] Optionally, the busbar is adhered to the heat exchange plate.

[0030] Optionally, the battery assembly further comprises a connecting tab assembly, and the connecting tab assembly comprises a flexible circuit board and a connecting nickel tab.

[0031] The two ends of the connecting nickel tab are connected to the busbar and the flexible circuit board, respectively.

[0032] Optionally, the connecting nickel tab comprises a welding portion and a connecting portion connected to the welding portion, the connecting portion is connected to the flexible circuit board, and the welding portion is connected to an end of the connecting portion away from the flexible circuit board.

[0033] The connecting portion passes over the bending portion, and the welding portion is welded to the plate surface of the connecting plate portion.

[0034] Optionally, the busbar is provided with a positioning pressing groove, the connecting nickel tab has a welding portion extending into the positioning pressing groove, and the welding portion is welded to the busbar.

[0035] Optionally, the shape of the positioning pressing groove matches the shape of the welding portion.

[0036] Optionally, the positioning pressing groove is arranged on one side edge of the connecting plate portion.

[0037] Optionally, the side edge portion of the connecting plate portion parallel to the first direction is connected to the bending portion, the length of the bending portion is shorter than the length of the connecting plate portion along the first direction, and the region of the side edge portion not connected to the bending portion is provided with the positioning pressing groove.

[0038] Optionally, the middle portion of the busbar is provided with at least one bending portion, and the bending portion of the middle portion is equal in length to the connecting portion.

[0039] Optionally, the positioning pressing groove is arranged on the side surface of the bending portion away from the battery cell.

[0040] Optionally, the connecting nickel tab is Z-shaped or L-shaped.

[0041] Optionally, the opposite sides of the flexible circuit board are staggered and arranged with the busbars, and each busbar is connected to the flexible circuit board through the connecting nickel tab.

[0042] A plurality of the battery cells are arranged along the extension direction of the flexible circuit board to form a battery cell group, the battery cell group forms a row of first poles and a row of second poles, a row of the first poles is arranged corresponding to the bus bar on one side of the flexible circuit board, and a row of the second poles is arranged corresponding to the bus bar on the other side of the flexible circuit board.

[0043] A battery pack comprising the battery assembly of any one of the above;

[0044] The bus bar is located on one side of the bottom of the battery cell, and the battery cell is inverted to insert the pole downward into the plug-in slot; or the bus bar is located on one side of the top of the battery cell, and the battery cell is upright to insert the pole upward into the plug-in slot.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] The battery assembly of the present application comprises a battery cell and a bus bar, the battery cell is provided with a pole, the bus bar is provided with a plug-in slot, when the pole is inserted into the plug-in slot, the two opposite side walls of the plug-in slot elastically clamp the pole, thereby realizing the connection of the battery cell and the pole. Compared with the connection mode in the prior art, in the present application, the pole can be directly pulled out of the plug-in slot when replacing the battery cell, and then the pole of the new battery cell can be inserted into the plug-in slot, without the need to disassemble the welded part, thereby making the replacement of the battery cell simpler and faster. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0048] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the limiting conditions under which the present application can be implemented, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects that can be produced by the present application and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present application.

[0049] Figure 1 The installation structure schematic diagram of the battery assembly provided by the embodiments of the present application;

[0050] Figure 2 The top view schematic diagram of the battery assembly provided by the embodiments of the present application;

[0051] Figure 3 A front view of a battery assembly according to an embodiment of the present application;

[0052] Figure 4 A front view of a battery assembly according to an embodiment of the present application; Figure 3 An enlarged view of position A in the middle;

[0053] Figure 5 An enlarged view of position A in the middle; Figure 4 An enlarged view of position B in the middle;

[0054] Figure 6 An installation structure of a first connecting sheet assembly according to an embodiment of the present application;

[0055] Figure 7 An installation structure of a first connecting sheet assembly according to an embodiment of the present application; Figure 6 An enlarged view of position C in the middle;

[0056] Figure 8 An installation structure of a second connecting sheet assembly according to an embodiment of the present application;

[0057] Figure 9 Figure 8 An enlarged view of position D in the middle;

[0058] Figure 10 An installation structure of a connecting sheet assembly according to an embodiment of the present application;

[0059] Figure 11 An installation structure of a connecting sheet assembly according to an embodiment of the present application; Figure 10 An enlarged view of position E in the middle.

[0060] Illustration: 1, battery cell; 11, pole; 111, plug-in part; 1101, first abutting surface; 1102, second abutting surface; 112, abutting platform; 12, conductive layer; 2, busbar; 201, positioning pressure groove; 21, plug-in groove; 22, connecting plate part; 23, bending part; 3, heat exchange plate; 31, installation groove; 32, first strip-shaped heat exchange part; 33, first heat exchange medium flow channel; 34, second strip-shaped heat exchange part; 35, second heat exchange medium flow channel; 4, insulating layer; 5, heat conducting part; 6, connecting sheet assembly; 61, flexible circuit board; 62, connecting nickel sheet; 621, welding part; 622, connecting part. DETAILED DESCRIPTION

[0061] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0062] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.

[0063] The technical solutions of the present application will be further described below in conjunction with the drawings and through specific embodiments.

[0064] Embodiment one

[0065] The battery assembly provided by the embodiment of the present application can effectively simplify the connection structure of the pole 11 and the busbar by skillfully arranging the connection structure between the battery cell 1 and the busbar 2, so that the pole 11 of the battery cell 1 can be inserted into the insertion slot 21 of the busbar 2, thereby making the replacement of the battery cell 1 more convenient and fast.

[0066] Please refer to Figures 1 to 5 , the battery assembly includes a battery cell 1 and a busbar 2, the busbar 2 has an insertion slot 21, and the battery cell 1 has a pole 11 which is insertedly connected with the insertion slot 21.

[0067] When the pole 11 of the battery assembly is inserted into the insertion slot 21, the two opposite side walls of the insertion slot 21 elastically clamp the pole 11.

[0068] Therefore, when the battery cell 1 needs to be replaced, the pole 11 can be directly pulled out of the insertion slot 21, thereby realizing the disconnection between the battery cell 1 and the insertion slot 21, and then the new battery cell 1 can be inserted into the position of the original battery cell 1, thereby completing the replacement of the battery cell 1.

[0069] It should be noted that the insertion connection of the pole 11 and the insertion slot 21 effectively simplifies the operation of replacing the battery cell 1, without the need to disconnect the welding part between the pole 11 and the insertion slot 21, thereby effectively improving the replacement efficiency of the battery cell 1.

[0070] When the pole 11 is inserted into the insertion slot 21, the pole 11 is elastically clamped by the two opposite side walls of the insertion slot 21, thereby achieving good conduction effect between the pole 11 and the busbar 2.

[0071] Optionally, the busbar 2 is provided with a plurality of insertion slots 21, and the pole 11 is provided with a plurality of insertion portions 111 corresponding to the plurality of insertion slots 21. The plurality of insertion slots 21 and the plurality of insertion portions 111 can make the connection between the pole 11 and the busbar 2 more stable, and the battery cell 1 is not easy to be disconnected from the busbar 2.

[0072] Optionally, the pole 11 further comprises an abutting table portion 112 connected with the insertion portion 111; the abutting table portion 112 has a table surface facing the busbar 2, and the insertion portion 111 is arranged on the table surface; the busbar 2 has a fitting surface for facing the table surface, and the fitting surface is provided with a conductive layer 12; when the pole 11 is inserted into the insertion slot 21, the opposite sides of the conductive layer 12 are respectively fitted with the fitting surface and the table surface. The conductive layer 12 further improves the conduction effect between the pole 11 and the busbar 2, effectively reduces the resistance between the pole 11 and the busbar 2, thereby effectively reducing the heating efficiency of the battery assembly, and is beneficial to prolong the service life of the battery assembly. It should be noted that the conductive layer 12 can also be other conductive parts, such as conductive cloth, conductive paste layer or conductive paint layer, etc. Alternatively, the conductive layer is cancelled, and the fitting surface and the table surface are in contact with each other, which can also effectively reduce the resistance between the pole 11 and the busbar 2 and improve the conduction effect.

[0073] Preferably, the table surface and the fitting surface are both flat surfaces. It should be noted that the table surface can also be an arc surface, and the fitting surface is an arc surface matching the table surface, thereby facilitating the improvement of the conduction effect of the conductive layer 12.

[0074] Optionally, the insertion portion 111 is a strip-shaped protrusion, and adjacent two strip-shaped protrusions are parallel to each other. The insertion portion 111 is a strip-shaped protrusion, which can make the insertion portion 111 more easily inserted into the insertion slot 21, and is beneficial to improve the contact area of the insertion portion 111 and the busbar 2.

[0075] In a specific implementation, the strip-shaped protrusion is in the shape of a long strip plate, comprising opposite first and second abutting surfaces 1101 and 1102, respectively, for abutting against opposite two side walls of the insertion slot 21. When the insertion portion 111 is inserted into the insertion slot 21, the opposite two side walls of the insertion slot 21 abut against the first and second abutting surfaces 1101 and 1102, respectively, and the opposite two side walls of the insertion slot 21 elastically clamp the strip-shaped protrusion.

[0076] Optionally, the insertion slot 21 is a groove, and the strip-shaped protrusion can be directly inserted into the groove from the groove opening, so that the replacement of the battery cell 1 is more simple and fast. It should be noted that in the battery assembly, a plurality of battery cells 1 are arranged along the extension direction of the groove.

[0077] Optionally, the cross section of the insertion slot 21 along the extension direction of the insertion slot 21 is rectangular, T-shaped, sector-shaped or trapezoidal. It should be noted that the present scheme does not limit the cross section shape of the insertion slot 21, as long as the insertion slot 21 can achieve the insertion connection with the insertion part 111.

[0078] Optionally, as shown in Figure 5 The smooth transition between the slot bottom and the slot wall of the insertion slot 21 is beneficial to the ability of the busbar 2 to keep the elastic clamping of the insertion part 111 and improve the service life of the busbar 2. It should be noted that the part forming the insertion slot 21 is made of elastic metal.

[0079] Optionally, the pole 11 includes at least two strip-shaped protrusions. On the one hand, the provision of at least two strip-shaped protrusions can effectively guarantee the stability of the insertion connection between the pole 11 and the busbar 2; on the other hand, the provision of at least two strip-shaped protrusions can further improve the contact area between the pole 11 and the busbar 2, thereby improving the conduction effect of the pole 11 and the busbar 2.

[0080] Optionally, the busbar 2 includes a connecting plate part 22 and a curved part 23 forming the insertion slot 21, and the connecting plate part 22 connects the curved part 23. The curved part 23 is used to achieve the insertion connection, and the connecting plate part 22 is used to connect the curved part 23; here, the connecting plate part 22 can be provided with multiple, and the curved part 23 can also be provided with multiple. Preferably, the busbar 2 is integrally formed, and the connecting plate part 22 and the curved part 23 are both made of an elastic conductive material. The curved part 23 has a certain elasticity, and when the pole 11 is inserted into the insertion slot 21, the curved part 23 elastically deforms and clamps the pole 11.

[0081] Optionally, the battery assembly further includes a heat exchange plate 3 and an insulating layer 4 arranged on the bottom surface of the busbar 2; the busbar 2 is fixedly connected with the heat exchange plate 3, and the insulating layer 4 at least partially adheres to the heat exchange plate 3. The insulating layer 4 is used to insulate and separate the heat exchange plate 3 and the busbar 2, so as to avoid the leakage of the busbar 2 conducting the heat exchange plate 3. Generally, the heat exchange plate 3 is made of a material with good heat conduction performance. Preferably, the bottom surface of the busbar 2 is fully coated with the insulating layer 4. The insulating layer 4 can be an insulating paint layer or other insulating coating. Further, the insulating layer 4 has good heat conduction effect, thereby being beneficial to the timely dissipation of the heat of the pole 11 to the outside.

[0082] In one specific implementation, the heat exchange plate 3 is provided with a mounting groove 31 for accommodating the bent portion 23, the bottom surface of the bent portion 23 abuts the groove bottom of the mounting groove 31, and the connecting plate portion 22 abuts the top surface of the heat exchange plate 3. On one hand, the mounting groove 31 is provided so that the bent portion 23 can be mounted into the mounting groove 31, so that the pole 11 is at least partially inserted into the mounting groove 31, thereby facilitating the reduction of the overall height of the battery assembly and the improvement of the energy density of the battery assembly; on the other hand, the connecting plate portion 22 abuts the top surface of the heat exchange plate 3, so that the heat on the pole 11 and the bus bar 2 can be quickly transferred to the heat exchange plate 3, thereby improving the cooling efficiency of the heat exchange plate 3 and facilitating the maintenance of the battery cell 1 in a more suitable temperature range.

[0083] Optionally, the bus bar 2 is provided with at least two bent portions 23, and the connecting plate portion 22 connects the adjacent two bent portions 23.

[0084] The heat exchange plate 3 is provided with at least two mounting grooves 31 corresponding to the at least two bent portions 23, and the positions of the mounting grooves 31 correspond to the positions of the corresponding bent portions 23; a first strip-shaped heat exchange portion 32 is formed between the adjacent two mounting grooves 31, and the first strip-shaped heat exchange portion 32 is internally provided with a first heat exchange medium flow channel 33.

[0085] A heat conduction component 5 is arranged between the first strip-shaped heat exchange portion 32 and the adjacent connecting plate portion 22, and opposite sides of the heat conduction component 5 abut the first strip-shaped heat exchange portion 32 and the connecting plate portion 22, respectively.

[0086] The heat conduction component 5 improves the efficiency of heat transfer to the first strip-shaped heat exchange portion 32, so that the heat on the pole 11 can be quickly transferred to the first strip-shaped heat exchange portion 32 through the bus bar 2, and then the heat is taken away by the heat exchange medium in the first heat exchange medium flow channel 33. Generally, the heat exchange medium can be a liquid or air, and is preferably water.

[0087] In one specific implementation, the heat conduction component 5 is a heat conduction pad or a heat conduction glue layer coated on the first strip-shaped heat exchange portion 32. Among them, the heat conduction pad can be arranged between the first strip-shaped heat exchange portion 32 and the adjacent connecting plate portion 22 during installation; or a heat conduction glue layer is coated on the first strip-shaped heat exchange portion 32 in advance to form the heat conduction component 5.

[0088] Optionally, the heat exchange plate 3 further comprises a second strip-shaped heat exchange part 34, and the second strip-shaped heat exchange part 34 is internally provided with a second heat exchange medium flow channel 35; an insulating heat-conducting layer is arranged between the second strip-shaped heat exchange part 34 and the top cover of the battery cell 1, and opposite sides of the insulating heat-conducting layer are respectively attached to the second strip-shaped heat exchange part 34 and the shell. On the one hand, the heat of the top cover of the battery cell 1 can be transmitted to the second strip-shaped heat exchange part 34 through the insulating heat-conducting layer, thereby accelerating the cooling speed; on the other hand, the second strip-shaped heat exchange part 34 is also used for supporting and abutting against the top cover of the battery cell 1, limiting the depth of the insertion of the pole 11 into the insertion slot 21, and avoiding the collision between the pole 11 and the slot bottom of the insertion slot 21.

[0089] Optionally, the busbar 2 is integrally stamped by stamping technology.

[0090] Optionally, the busbar 2 is adhered to the heat exchange plate 3, thereby realizing the function of fixing the busbar 2 to the heat exchange plate 3. It should be noted that the adhesive is insulating glue.

[0091] Optionally, the battery assembly further comprises a connecting sheet assembly 6, please refer to Figures 6 to 11 , the connecting sheet assembly 6 comprises a flexible circuit board 61 and a connecting nickel sheet 62; two ends of the connecting nickel sheet 62 are respectively connected to the busbar 2 and the flexible circuit board 61. The connecting sheet assembly 6 is used for collecting information of the battery cell 1, including voltage information, current information and temperature information and the like, so as to monitor the working state of the battery assembly.

[0092] Optionally, as Figures 8 to 9 , the connecting nickel sheet 62 comprises a welding part 621 and a connecting part 622 connecting the welding part 621, the connecting part 622 is connected to the flexible circuit board 61, and the welding part 621 is connected to one end of the connecting part 622 away from the flexible circuit board 61; the connecting part 622 passes over the bending part 23, and the welding part 621 is welded to the plate surface of the connecting plate part 22.

[0093] The welding part 621 is welded to the connecting plate part 22, and the pole 11 is conductive to the connecting plate part 22, so that the opposite two ends of the connecting nickel sheet 62 are respectively communicated with the pole 11 and the flexible circuit board 61, so that each detection element on the flexible circuit board 61 can detect the voltage, current and the like of the battery cell 1. In addition, it should be noted that the battery cell 1 is connected to the busbar 2 through the pole 11, so that the connecting nickel sheet 62 does not need to be re-welded to the pole 11 after the battery cell 1 is replaced. That is to say, even if the battery cell 1 is replaced, it will not affect the connecting sheet assembly 6 to detect various states of the new battery cell 1, further simplifying the steps of replacing the battery cell 1.

[0094] It should be further pointed out that the plate surface of the connecting plate part 22 is a plane, which is easy to weld, and effectively reduces the welding difficulty of the connecting nickel sheet 62.

[0095] Optionally, the busbar 2 is provided with a positioning pressing groove 201, the connecting nickel sheet 62 has a welding portion 621 extending into the positioning pressing groove 201, and the welding portion 621 is welded to the busbar 2. The positioning pressing groove 201 is used to position the welding portion 621, so as to avoid excessive deviation of the position of the welding portion 621, thereby causing poor welding connection effect.

[0096] Optionally, the shape of the positioning pressing groove 201 matches the shape of the welding portion 621, so as to accurately position the welding portion 621.

[0097] In a specific implementation, referring to Figure 6 and Figure 7 , the positioning pressing groove 201 is arranged on one side edge of the connecting plate portion 22. The welding portion 621 can be directly positioned by extending into the positioning pressing groove 201, thereby achieving rapid installation. Preferably, the side edge portion of the connecting plate portion 22 parallel to the first direction is connected with a bending portion 23; along the first direction, the length of the bending portion 23 is shorter than the length of the connecting plate portion 22, and the region of the side edge portion which is not connected with the bending portion 23 is provided with the positioning pressing groove 201, thereby further shortening the connection distance between the flexible circuit board 61 and the busbar 2, optimizing the connection structure, and being beneficial to improving the integration of the battery assembly and reducing the welding difficulty of the busbar 2 and the connecting nickel sheet 62.

[0098] Optionally, the middle portion of the busbar 2 is provided with at least one bending portion 23, and the bending portion 23 of the middle portion is equal in length to the connecting portion 622. The bending portion 23 equal in length to the connecting portion 622 can avoid the defect that the stability of the plug-in connection between the pole 11 and the busbar 2 is poor due to the shortness of part of the bending portion 23, so that the pole 11 and the busbar 2 can always be reliably connected in conduct.

[0099] Optionally, referring to Figures 10 to 11 , the positioning pressing groove 201 is arranged on the side surface of the bending portion 23 away from the battery cell 1. The connecting nickel sheet 62 extends to the side surface of the bending portion 23 away from the battery cell 1 and extends into the positioning pressing groove 201, and the connecting nickel sheet 62 is welded to the bending portion 23.

[0100] Optionally, the connecting nickel sheet 62 is Z-shaped or L-shaped, or the connecting nickel sheet 62 is of other shapes, as long as the connecting nickel sheet 62 can connect the busbar 2 and the flexible circuit board 61.

[0101] Optionally, the busbar 2 is arranged on the opposite sides of the flexible circuit board 61 in a staggered manner, and each busbar 2 is connected to the flexible circuit board 61 through the connecting nickel sheet 62; a plurality of battery cells 1 are arranged along the extension direction of the flexible circuit board 61 to form a battery cell group, the battery cell group forms a row of first poles 11 and a row of second poles 11, a row of first poles 11 is arranged corresponding to the busbar 2 on one side of the flexible circuit board 61, and a row of second poles 11 is arranged corresponding to the busbar 2 on the other side of the flexible circuit board 61.

[0102] It should be noted that the flexible circuit board 61 is connected with a plurality of connection nickel sheets 62, the plurality of connection nickel sheets 62 are arranged, and one connection nickel sheet 62 is used to connect 2N battery cells, N is a natural number, and N≥1.

[0103] It should be further noted that one busbar 2 connects the positive pole of two adjacent battery cells 1 or the negative pole of two adjacent battery cells 1.

[0104] It should be further noted that if the plurality of battery cells in the battery assembly are connected in series or in parallel, the corresponding busbars 2 are connected in series or in parallel, which is a prior art and will not be described in detail.

[0105] Embodiment two

[0106] The embodiment discloses a battery pack comprising the battery assembly of any one of the embodiments.

[0107] The busbar 2 is located on one side of the bottom of the battery cell 1, and the battery cell 1 is inverted so that the pole 11 is inserted into the insertion slot 21 downward; or the busbar 2 is located on one side of the top of the battery cell 1, and the battery cell 1 is upright so that the pole 11 is inserted into the insertion slot 21 upward.

[0108] It should be noted that when the battery cell 1 is inverted so that the pole 11 is inserted into the insertion slot 21 downward, the pole 11 and the busbar 2 are connected by insertion under the gravity of the battery cell 1, thereby ensuring the stability of the insertion connection, and the battery cell 1 can be taken out more simply when the battery cell is replaced without disassembling the support components on one side of the bottom of the battery pack.

[0109] When the battery cell 1 is upright so that the pole 11 is inserted into the insertion slot 21 upward, the battery cell 1 is upright, and the connection effect between the pole 11 and the busbar 2 is easy to observe, but the battery cell 1 to be replaced needs to be taken out from the side when the battery cell 1 is replaced, and other battery cells 1 need to be avoided from falling out or sliding out of the fixed box during the replacement process of the battery cell 1.

[0110] It should be further noted that the battery pack should include necessary components such as the fixed box, the device for providing the cooling medium, the partition element for separating the battery cells 1, the bearing structure for bearing the battery assembly, and the like.

[0111] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is also possible that the use of certain terms can vary from one embodiment to another. For example, the term "first" and "second" can be interchangeable depending on the context. Also, the use of "including", "comprising" or "having" can be used as meaning "including but not limited to". Moreover, certain terminology can also be used in certain traditional ways by those of ordinary skill in the art and that is also intended to be incorporated herein by reference.

[0112] Although the embodiments of the present application have been disclosed with reference to many embodiments, a person of ordinary skill in the art understands that there are many variations, modifications, replacements and changes that can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0113] The above-described embodiments are merely used to illustrate the technical solutions of the present application, but not to limit the present application; even though the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery assembly, comprising: The battery assembly comprises a cell (1) and a busbar (2), the busbar (2) has a plug-in slot (21), the cell (1) has a pole (11) which is plugged into the plug-in slot (21); When the pole (11) of the battery assembly is inserted into the plug-in slot (21), the two opposite side walls of the plug-in slot (21) elastically clamp the pole (11); The busbar (2) comprises a connecting plate part (22) and a curved part (23) which forms the plug-in slot (21), and the connecting plate part (22) connects the curved part (23); Further comprising a heat exchange plate (3); The busbar (2) is fixedly connected with the heat exchange plate (3); The heat exchange plate (3) is provided with a mounting groove (31) for accommodating the curved part (23), The bottom surface of the curved part (23) is attached to the groove bottom of the mounting groove (31), and the connecting plate part (22) is attached to the top surface of the heat exchange plate (3). The busbar (2) is provided with a plurality of plug-in slots (21), and the pole (11) has a plurality of plug-in parts (111) corresponding to the plurality of plug-in slots (21) one by one.

2. The battery assembly of claim 1, wherein, The pole (11) further comprises an abutting table part (112) connected with the plug-in part (111); the abutting table part (112) has a table surface facing the busbar (2), and the plug-in part (111) is arranged on the table surface; 3. The battery assembly of claim 2, wherein, The busbar (2) has a fitting surface facing the table surface, and the fitting surface is provided with a conductive layer (12); when the pole (11) is inserted into the plug-in slot (21), the conductive layer (12) is attached to the fitting surface and the table surface respectively. The plug-in part (111) is a strip-shaped protrusion, and adjacent two strip-shaped protrusions are parallel to each other.

4. The battery assembly of claim 2, wherein, The strip-shaped protrusion is in the shape of a long strip plate, comprising opposite first and second abutting surfaces (1101) and (1102), respectively, for abutting against the two opposite side walls of the plug-in slot (21).

5. The battery assembly of claim 4, wherein, The plug-in slot (21) is a groove.

6. The battery assembly of claim 4, wherein, The cross section of the plug-in slot (21) along the extension direction of the plug-in slot (21) is in the shape of a rectangle, a T, a sector or a trapezoid.

7. The battery assembly of claim 6, wherein, The plug-in slot (21) is smoothly connected between the groove bottom and the groove wall.

8. The battery assembly of claim 4, wherein, One pole (11) comprises at least two strip-shaped protrusions.

9. The battery assembly of claim 4, wherein, Further comprising an insulating layer (4) arranged on the bottom surface of the busbar (2); 10. The battery assembly of claim 1, wherein, The insulating layer (4) at least partially attaches to the heat exchange plate (3). The busbar (2) is provided with at least two curved parts (23), and the connecting plate part (22) connects adjacent two curved parts (23); 11. The battery assembly of claim 1, wherein, The heat exchange plate (3) is provided with at least two mounting grooves (31) corresponding to the at least two curved parts (23), and the positions of the mounting grooves (31) correspond to the positions of the corresponding curved parts (23); adjacent two mounting grooves (31) form a first strip-shaped heat exchange part (32), and the first strip-shaped heat exchange part (32) is internally provided with a first heat exchange medium flow channel (33). ​ The first strip-shaped heat exchange part (32) and the adjacent connecting plate part (22) are provided with a heat conduction component (5), and opposite sides of the heat conduction component (5) abut against the first strip-shaped heat exchange part (32) and the connecting plate part (22) respectively.

12. The battery assembly of claim 11, wherein, The heat conduction component (5) is a heat conduction pad or a heat conduction glue layer coated on the first strip-shaped heat exchange part (32).

13. The battery assembly of claim 10, wherein, The heat exchange plate (3) further comprises a second strip-shaped heat exchange part (34), and the second strip-shaped heat exchange part (34) is internally provided with a second heat exchange medium flow channel (35). The second strip-shaped heat exchange part (34) and the top cover of the battery cell (1) are provided with an insulating heat conduction layer, and opposite sides of the insulating heat conduction layer abut against the second strip-shaped heat exchange part (34) and the top cover respectively.

14. The battery assembly of claim 1, wherein, The busbar (2) is integrally stamped and formed.

15. The battery assembly of claim 10, wherein, The busbar (2) is bonded to the heat exchange plate (3).

16. The battery assembly of claim 1, wherein, Further comprising a connecting sheet assembly (6), the connecting sheet assembly (6) comprises a flexible circuit board (61) and a connecting nickel sheet (62). Two ends of the connecting nickel sheet (62) are connected to the busbar (2) and the flexible circuit board (61) respectively.

17. The battery assembly of claim 16, wherein, The connecting nickel sheet (62) comprises a welding part (621) and a connecting part (622) connected to the welding part (621), the connecting part (622) is connected to the flexible circuit board (61), and the welding part (621) is connected to one end of the connecting part (622) away from the flexible circuit board (61). The connecting part (622) passes over the bending part (23), and the welding part (621) is welded to the plate surface of the connecting plate part (22).

18. The battery assembly of claim 17, wherein, The busbar (2) is provided with a positioning pressing groove (201), the connecting nickel sheet (62) has a welding part (621) extending into the positioning pressing groove (201), and the welding part (621) is welded and connected to the busbar (2).

19. The battery assembly of claim 18, wherein, The shape of the positioning pressing groove (201) matches the shape of the welding part (621).

20. The battery assembly of claim 18, wherein, The positioning pressing groove (201) is arranged on one side edge of the connecting plate part (22).

21. The battery assembly of claim 19, wherein, The side edge part of the connecting plate part (22) parallel to the first direction is connected with the bending part (23); along the first direction, the length of the bending part (23) is shorter than the length of the connecting plate part (22), and the region of the side edge part where the bending part (23) is not connected is provided with the positioning pressing groove (201).

22. The battery assembly of claim 21, wherein, The middle part of the busbar (2) is provided with at least one bending part (23), and the bending part (23) of the middle part is equal in length to the connecting part (622).

23. The battery assembly of claim 18, wherein, The positioning pressing groove (201) is arranged on the side surface of the bending part (23) away from the battery cell (1).

24. The battery assembly of claim 16, wherein, The connecting nickel sheet (62) is Z-shaped or L-shaped.

25. The battery assembly of claim 16, wherein, The opposite sides of the flexible circuit board (61) are staggered and arranged with the busbar (2), and each busbar (2) is connected to the flexible circuit board (61) through the connecting nickel sheet (62). A plurality of the battery cells (1) are arranged along the extension direction of the flexible circuit board (61) to form a battery cell (1) group, the battery cell (1) group forms a row of first poles (11) and a row of second poles (11), a row of the first poles (11) is arranged corresponding to the bus bar (2) on one side of the flexible circuit board (61), and a row of the second poles (11) is arranged corresponding to the bus bar (2) on the other side of the flexible circuit board (61).

26. A battery pack, characterized by The battery assembly comprises the battery assembly as claimed in any one of claims 1 to 25; The bus bar (2) is located on one side of the bottom of the battery cell (1), and the battery cell (1) is inverted so that the pole (11) is inserted into the plug-in slot (21) downward; or the bus bar (2) is located on one side of the top of the battery cell (1), and the battery cell (1) is upright so that the pole (11) is inserted into the plug-in slot (21) upward.

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