Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body and at least two groups of battery modules, the battery modules are connected into an integral structure, so that the integral strength of the battery modules can be improved, and the strength of the battery pack can be improved after a large module is put into a shell; the end plates made of non-metal materials are arranged at the two ends of the battery module in the length direction respectively, compared with the end plates made of metal materials, the weight and the occupied space of the end plates can be effectively reduced, the end plates abut against the cross beams after the large module enters the shell, and a bearing structure for the expansion force of the battery module is adjusted to be the cross beams of the box body from the metal end plates. No longitudinal beam is arranged in the battery pack, so that the weight of the battery pack can be greatly reduced, the occupied space of the metal end plates and the longitudinal beam is reduced, and the space utilization rate in the width direction of the battery pack, the grouping efficiency and the energy density of the battery pack are effectively improved; and the battery pack can meet the requirements of high energy density, high grouping efficiency and low weight of the new energy automobile.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery pack. BACKGROUND

[0002] The existing CTP battery pack includes end plate, steel band and box body structure, the box body is equipped with longitudinal beam and crossbeam, the end plate is metal material, the end plate and longitudinal beam are heavy and occupy larger space, leading to the battery pack is heavy, the group efficiency is low and the energy density of battery pack is affected, it is difficult to satisfy the demand of people to new energy vehicle high energy density, high group efficiency and low weight. SUMMARY

[0003] Therefore, the utility model provides a battery pack to solve the problem of the heavy weight and low group efficiency of the CTP battery pack in the prior art.

[0004] The utility model provides a battery pack, it includes:

[0005] Box body, including edge beam and the crossbeam of being equipped with in the edge beam inside;

[0006] At least two groups of battery module, each group battery module includes multiple electric core arranged in line along the length direction of the box body, the top of electric core is equipped with pole and pressure relief structure, wherein at least two groups of battery module are sequentially arranged and are connected along the width direction of the box body, and the first heat insulation board is arranged between the adjacent electric core arranged in line, and the electric core on both sides of the first heat insulation board is connected with the first heat insulation board, and the end plate of nonmetal material is arranged at both ends of the length direction of each group of battery module, and the end plate at both ends of the length direction of the battery module abuts the crossbeam.

[0007] Beneficial effect: the battery pack of this structure, at least two groups of battery module are sequentially arranged and are connected along the width direction of the box body and form big module, and the adjacent electric core arranged in line is connected on the first heat insulation board, and the end plate is arranged at the end of battery module, so that the battery module is connected to form an integral structure, the overall strength of the battery module can be improved, and the strength of the battery pack can be improved after the big module is put into the shell, the end plate of nonmetal material is arranged at both ends of the length direction of the battery module, compared with the end plate of metal material, the weight and the occupied space of the end plate can be effectively reduced, the bearing structure of the battery module expansion force is adjusted from the metal end plate to the crossbeam of the box body after the big module is put into the shell, and the longitudinal beam is not arranged in the battery pack, the weight of the battery pack can be greatly reduced, the occupied space of the metal end plate and the longitudinal beam is reduced, the space utilization rate of the battery pack in the width direction, the group efficiency and the energy density of the battery pack are effectively improved, so that the battery pack can meet the demand of new energy vehicle high energy density, high group efficiency and low weight.

[0008] In an alternative embodiment, a second heat insulation plate is arranged between the battery modules adjacent to each other along the width direction of the box body, and the adjacent battery modules are connected with the second heat insulation plate.

[0009] Beneficial effect: the second heat insulation plate is arranged between the adjacent battery modules to block heat transfer, which can prevent heat transfer from the side of the battery cell in the case of thermal runaway, and can avoid the whole battery pack catching fire.

[0010] In an alternative embodiment, the length of the battery cell is a, the distance between the side of the pole and the side of the battery cell is e, and e / a≤9%.

[0011] In an alternative embodiment, a pressing strip is further included; the battery cell includes a shell and an insulating film wrapped outside the shell, and the top of the insulating film outside the pole is provided with an opening, and the pressing strip is bonded to the shell at the opening of the top of the battery cell of the adjacent two rows.

[0012] Beneficial effect: the pressing strip is bonded to the shell at the opening of the top of the adjacent two rows of battery cells, which can further improve the strength of the battery pack. The opening exposes the shell of metal material, which facilitates the firm bonding of the pressing strip to the shell.

[0013] In an alternative embodiment, the distance between the end of the opening towards the side of the battery cell and the side of the battery cell is d, and d≤2mm.

[0014] Beneficial effect: the width of the opening can be guaranteed under the condition that the distance e between the side of the pole towards the side of the battery cell and the side of the battery cell is constant, so as to guarantee the bonding area between the pressing strip and the shell, and to guarantee that the pressing strip can be firmly bonded to the shell, which is conducive to improving the strength of the battery pack.

[0015] In an alternative embodiment, an elastic buffer is arranged on the first heat insulation plate, and the first heat insulation plate and the elastic buffer form a cell gap d1 between the adjacent battery cells, the width of the battery cell is c, and 0.015≤d1 / c≤0.09.

[0016] Beneficial effect: the arrangement of the elastic buffer allows the battery module to be compressed in the length direction, the module is compressed when entering the shell, which facilitates the entry of the module into the shell, and after the module enters the shell, the size rebounds to make the end plate abut against the cross beam.

[0017] In an alternative embodiment, the distance between the battery cell at the end of the length direction of the battery module and the cross beam is d2, and d2≤4.5mm.

[0018] Beneficial effects: This design can prevent the gap between the cells and the crossbeam at the ends of the module along its length from being too large, which can further improve the volumetric assembly efficiency of the battery pack.

[0019] In one alternative implementation, each group of battery modules includes at least two rows of cells;

[0020] And / or, the number of cells in each row is n, where n≤40.

[0021] Beneficial effects: The number of rows of cells in each battery module is moderate, resulting in high overall strength after the battery modules are assembled. n≤40, which prevents the number of cells in each row from affecting the strength of the battery module, thus ensuring the strength of the battery module and battery pack.

[0022] In one alternative implementation, all the cells are connected in series to form a positive output terminal and a negative output terminal.

[0023] Beneficial effects: The battery pack contains only one positive output terminal and one negative output terminal, making the battery pack easy to install.

[0024] In one alternative embodiment, a cooling plate is integrated into the bottom of the housing, and the bottom surface of the battery module is bonded to the cooling plate.

[0025] Beneficial effects: The cooling plate is integrated into the housing, saving space and further improving the battery pack assembly efficiency. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural diagram of a battery pack according to an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 A top view of the battery pack shown;

[0029] Figure 3 for Figure 1 An exploded view of the battery pack shown.

[0030] Figure 4 for Figure 1 Top view of the battery module;

[0031] Figure 5 forFigure 1 Schematic view of the battery cell;

[0032] Figure 6 Schematic view of the single battery module in Figure 1

[0033] Figure 7 Schematic view of the single battery module in Figure 1

[0034] Figure 8 Schematic view of the single battery module in Figure 1

[0035] Figure 9 Schematic view of the multiple battery modules assembled;

[0036] Figure 10 Schematic view of the multiple battery modules assembled;

[0037] Figure 11 Schematic view of the battery module assembled into the box;

[0038] Figure 12 Schematic view of the battery pack shown in Figure 1

[0039] Figure 13 Schematic view of the battery module in Figure 1

[0040] Figure 14 Schematic view of the box of the battery pack shown in Figure 1 BRIEF DESCRIPTION OF DRAWINGS

[0041] 1, box; 11, side beam; 12, cross beam; 2, battery module; 21, battery cell; 211, pole; 212, pressure relief structure; 213, insulating film; 2131, opening; 214, shell; 22, first heat insulation plate; 221, elastic buffer; 23, end plate; 3, second heat insulation plate; 4, pressing strip; 5, positive output pole; 6, negative output pole; 7, cooling plate; 8, busbar.

[0042] DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] ​​​​​​The embodiments of the utility model are described below Figures 1 to 14 , describe the embodiment of the utility model.

[0045] According to the embodiment of the utility model, on the one hand, a battery pack is provided, comprising a box body 1 and at least two groups of battery modules 2.

[0046] Among them, the box body 1 comprises a side beam 11 and a cross beam 12 arranged inside the side beam 11;Each group of battery modules 2 comprises a plurality of battery cells 21 arranged in a row along the length direction of the box body 1, and the top of the battery cell 21 is provided with a pole 211 and a pressure relief structure 212;At least two groups of battery modules 2 are arranged and connected in turn along the width direction of the box body 1, and a first heat insulation plate 22 is arranged between the adjacent battery cells 21 arranged in a row, and the battery cells 21 on both sides of the first heat insulation plate 22 are connected with the first heat insulation plate 22;The end plate 23 made of non-metallic material is arranged at both ends of each group of battery modules 2 in the length direction, and the end plate 23 at both ends of the battery module 2 in the length direction abuts against the cross beam 12.

[0047] The battery pack with the structure, at least two groups of battery modules 2 are arranged and connected in turn along the width direction of the box body 1 to form a large module, the adjacent battery cells 21 in the same row are connected on the first heat insulation plate 22, and the end plate 23 is arranged at the end of the battery module 2, so that the battery module 2 is connected to form a whole structure, the overall strength of the battery module 2 can be improved, and the strength of the battery pack can be improved after the large module is put into the shell;The end plate 23 made of non-metallic material is arranged at both ends of the battery module 2 in the length direction, which can effectively reduce the weight and occupied space of the end plate 23 compared with the end plate 23 made of metal, and the end plate 23 abuts against the cross beam 12 after the large module is put into the shell, the bearing structure of the expansion force of the battery module 2 is adjusted from the metal end plate 23 to the cross beam 12 of the box body 1, and no longitudinal beam is arranged in the battery pack, which can greatly reduce the weight of the battery pack, reduce the occupied space of the metal end plate 23 and the longitudinal beam, effectively improve the space utilization rate of the battery pack in the width direction, the grouping efficiency of the battery pack and the energy density, so that the battery pack can meet the demand of high energy density, high grouping efficiency and low weight of new energy vehicles.

[0048] As shown in Figure 9 and Figure 10 , the second heat insulation plate 3 is arranged between the adjacent battery modules 2 arranged along the width direction of the box body 1, the adjacent battery modules 2 are connected with the second heat insulation plate 3, and the second heat insulation plate 3 is arranged between the adjacent battery modules 2 to block the heat transfer, which can prevent the side heat transfer of the battery cell 21 in the case of thermal runaway, and can avoid the whole battery pack from catching fire.

[0049] The iron lithium battery cell 21 has higher heat resistance than the ternary battery cell 21, when the battery cell 21 is the ternary battery cell 21, the second heat insulation plate 3 needs to be arranged between the adjacent battery modules 2, when the battery cell 21 is the iron lithium battery cell 21, the second heat insulation plate 3 can not be arranged between the adjacent battery modules 2.

[0050] As shown in Figure 5 The length of the battery cell 21 is a, the distance between the pole 211 and the side of the battery cell 21 is e, e / a≤9%, so that the pole 211 is arranged close to the side of the battery cell 21.

[0051] In some embodiments, the battery pack further comprises a pressing strip 4; the battery cell 21 comprises a shell 214 and an insulating film 213 wrapped outside the shell 214, the top of the insulating film 213 outside the pole 211 is provided with an opening 2131, and the pressing strip 4 is bonded to the shell 214 at the opening 2131 on the top of the two adjacent rows of battery cells 21, which can further improve the strength of the battery pack. The opening 2131 exposes the shell 214 made of metal, which facilitates the firm bonding of the pressing strip 4 to the shell 214.

[0052] The pole 211 comprises a positive pole and a negative pole, and the insulating film 213 outside the positive pole and the negative pole is provided with an opening 2131.

[0053] As shown in Figure 5 The distance between the end of the opening 2131 towards the side of the battery cell 21 and the side of the battery cell 21 is d, d≤2mm, that is, the width of the insulating film 213 outside the opening 2131 is small, which can ensure the width of the opening 2131 under the condition that the distance e between the pole 211 and the side of the battery cell 21 is constant, thereby ensuring the bonding area between the pressing strip 4 and the shell 214, and ensuring that the pressing strip 4 can be firmly bonded to the shell 214, which is conducive to improving the strength of the battery pack.

[0054] In some embodiments, the ratio of the width of the pressing strip 4 to the length a of the battery cell 21 is 0.02-0.13, which can ensure that the pressing strip 4 has sufficient width, thereby facilitating the improvement of the strength of the pressing strip 4 and the battery pack, and at the same time avoiding that the width of the pressing strip 4 is too large.

[0055] In some embodiments, the thickness of the pressing strip 4 is not less than 3mm, which can ensure the stiffness of the pressing strip 4.

[0056] As shown in Figure 7 In some embodiments, the first heat insulation plate 22 is provided with an elastic buffer 221, and the first heat insulation plate 22 and the elastic buffer 221 form a gap d1 between the adjacent battery cells 21, the width of the battery cell 21 is c, and 0.015≤d1 / c≤0.09, the arrangement of the elastic buffer 221 enables the battery module 2 to be compressed in the length direction, the module is compressed when entering the shell, and after the module enters the shell, the size rebounds to make the end plate 23 abut against the cross beam 12.

[0057] In some alternative embodiments, the elastic cushioning element 221 includes foam.

[0058] like Figure 5 As shown, the ratio of the gap d1 between adjacent cells 21 to the width c of cell 21 is 1% to 8%.

[0059] In some embodiments, the deformation dimension in the length direction of the module is f, where f / a < 0.02. This can prevent the battery module 2 from deforming too much in the length direction and becoming difficult to spring back after being inserted into the casing.

[0060] In some embodiments, the distance between the cell 21 at the end of the length direction of the battery module 2 and the crossbeam 12 is d2, where d2 ≤ 4.5 mm. This can prevent the distance between the cell 21 at the end of the length direction of the module and the crossbeam 12 from being too large, and can further improve the volumetric grouping efficiency of the battery pack.

[0061] In some alternative embodiments, such as Figures 6 to 8 As shown, each battery module 2 includes at least two rows of cells 21, with the sides of each row of cells 21 bonded together. The number of rows of cells 21 in each battery module 2 is moderate, and the overall strength of the battery module 2 is high after assembly.

[0062] In some embodiments, the number of cells 21 in each row is n, where n≤40. This can prevent the number of cells 21 in each row from being too large and affecting the strength of the battery module 2, thus ensuring the strength of the battery module 2 and the battery pack.

[0063] In some alternative embodiments, such as Figures 9 to 12 As shown, each battery module 2 has two rows of cells 21. Three battery modules 2 are assembled into a large module. The battery pack has three crossbeams 12, which are spaced apart to form two installation spaces. There are two large modules, which are respectively installed in the two installation spaces.

[0064] The side of the battery module 2 is bonded to the second heat insulation plate 3 with structural adhesive. After the module is installed in the shell, the sides of the adjacent modules are pressed together to ensure the strong adhesion of the adhesive layer.

[0065] like Figure 2 and Figure 4 As shown, in some embodiments, all cells 21 are connected in series through busbar 8 to form a positive output terminal 5 and a negative output terminal 6. The battery pack contains only one positive output terminal 5 and one negative output terminal 6, making the battery pack easy to install.

[0066] like Figure 14 As shown, the battery pack also includes a cooling plate 7 integrated at the bottom of the housing 1. The bottom surface of the battery module 2 is bonded to the cooling plate 7. The cooling plate 7 is integrated on the housing 1, which saves space and can further improve the assembly efficiency of the battery pack.

[0067] In some embodiments, the bottom of the battery module 2 is adhered to the cooling plate 7 by a heat-conducting adhesive to fix the module and conduct heat to the module.

[0068] As shown in Figures 10 to 12 When the battery pack is assembled, the pole 211 is downward so that the battery module 2 is placed upside down on the tooling table, the module is inverted into the box, and the box body 1 is turned over after the module is inverted into the box so that the pole 211 is upward.

[0069] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized by, The application relates to a battery module and a battery pack. The battery module comprises a box body, at least two groups of battery modules, and a batten. The battery module further comprises a second heat insulation plate arranged between two adjacent battery modules along the width direction of the box body.

2. The battery pack of claim 1, wherein, The length of the battery cell is a, the distance between the side of the pole and the side of the battery cell is e, and e / a<=9%.

3. The battery pack of claim 1 or 2, wherein, The battery module further comprises a pressing strip.

4. The battery pack of claim 1 or 2, wherein, The opening of the insulating film towards the side of the battery cell has a distance d from the side of the battery cell, and d<=2mm.

5. The battery pack of claim 4, wherein, The first heat insulation plate is provided with an elastic buffer, and the first heat insulation plate and the elastic buffer form a cell gap d1 between two adjacent battery cells.

6. The battery pack of claim 1 or 2, wherein, The distance between the battery cell at the end of the battery module and the cross beam is d2, and d2<=4.5mm.

7. The battery pack of claim 1 or 2, wherein, Each group of battery modules comprises at least two rows of battery cells.

8. The battery pack of claim 1 or 2, wherein, The number of battery cells in each row is n, and n<=40. All the battery cells are connected in series to form a positive output pole and a negative output pole.

9. The battery pack of claim 1 or 2, wherein, The battery module further comprises a cooling plate integrated at the bottom of the box body, and the bottom surface of the battery module is bonded to the cooling plate.

10. The battery pack of claim 1 or 2, wherein, ​

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