Battery pack

Abstract

The utility model discloses a battery pack which comprises a plurality of battery cell groups, each battery cell group comprises a plurality of battery cells arranged at intervals along a first direction, two adjacent battery cells are connected in series through a first connecting piece, the plurality of battery cell groups are arranged at intervals along a second direction, two adjacent battery cell groups are connected in parallel through a second connecting piece, and the first connecting piece is connected with the second connecting piece. The first connecting piece and the second connecting piece are split pieces, and the first direction is perpendicular to the second direction. According to the battery pack disclosed by the utility model, high-efficiency energy storage and release can be ensured, current sharing and safety are ensured, and the battery pack is flexible in connection and simple in structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field more particularly, relate to a kind of battery pack. BACKGROUND

[0002] In the related art, multiple cells are connected in series and parallel using integrated aluminum tabs, nickel tabs or nickel-plated copper, which has a complex structure, many types, and requires stamping and cutting dies, which can easily generate excess waste and increase production costs. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a battery pack that can ensure efficient energy storage and release, ensure current sharing and safety, and has flexible connection and simple structure.

[0004] The battery pack according to the embodiments of the utility model comprises: a cell group, the cell group comprises a plurality of cells arranged at intervals along a first direction, and two adjacent cells are connected in series by a first connecting piece; the cell group is a plurality of groups arranged at intervals along a second direction, and two adjacent cell groups are connected in parallel by a second connecting piece; the first connecting piece and the second connecting piece are separate pieces, and the first direction and the second direction are perpendicular.

[0005] The battery pack according to the embodiments of the utility model connects two adjacent cells in series by a first connecting piece and connects two adjacent cell groups in parallel by a second connecting piece, which can meet the low-voltage requirement of the battery pack while ensuring the battery capacity, ensure efficient energy storage and release of the battery pack, and ensure the safety of the battery pack by ensuring current sharing and safety protection between multiple cell groups. At the same time, the first connecting piece and the second connecting piece are separate pieces, which can ensure the flexibility of connecting multiple cells and multiple cell groups, facilitate the connection requirement of different positions, and have simple structure and low production cost.

[0006] In addition, the battery pack according to the above embodiments of the utility model can also have the following additional technical features:

[0007] According to some embodiments of the utility model, the first connecting piece comprises a plurality of first sub-connecting pieces arranged along the second direction, and each of the first sub-connecting pieces connects two adjacent cells in series.

[0008] According to some embodiments of the utility model, the second connecting piece comprises a plurality of second sub-connecting pieces, and the second sub-connecting pieces are arranged at intervals along the first direction and connect the cells of two adjacent cell groups in parallel.

[0009] According to some embodiments of the present application, the middle part of the second sub-connector protrudes towards the direction away from the battery cell.

[0010] According to some embodiments of the present application, the plurality of battery cells include a first battery cell and a second battery cell arranged at intervals along the first direction, the first battery cell and the second battery cell each having a positive electrode and a negative electrode, and the battery pack further comprises: an insulating support arranged on one side of the battery cell, a connecting part arranged on the insulating support, the connecting part being located between the first battery cell and the second battery cell, a first avoiding hole for avoiding the positive electrode of the first battery cell and a second avoiding hole for avoiding the negative electrode of the second battery cell being arranged on the connecting part, and the first connector being arranged on the connecting part and having two ends in the length direction of the first connector being connected to the positive electrode of the first battery cell and the negative electrode of the second battery cell respectively.

[0011] According to some embodiments of the present application, a groove is further arranged on the connecting part, the groove being communicated with the first avoiding hole and the second avoiding hole, and part of the first connector being arranged in the groove and the end face of the first connector away from the battery cell being recessed in the groove.

[0012] According to some embodiments of the present application, a third avoiding hole is further arranged on the insulating support, and the second connector is arranged in the third avoiding hole to connect two adjacent battery cell groups in parallel.

[0013] According to some embodiments of the present application, the battery pack further comprises: a positive electrode busbar and a negative electrode busbar, the positive electrode busbar and the negative electrode busbar being located on the side of the insulating support away from the battery cell group and at two ends in the length direction of the insulating support respectively, the positive electrode busbar being connected to a plurality of first connectors connecting the positive electrodes of the battery cells located at the outermost ends in the length direction of the battery cell group, and the negative electrode busbar being connected to a plurality of first connectors connecting the negative electrodes of the battery cells located at the outermost ends in the length direction of the battery cell group.

[0014] According to some embodiments of the present application, along the second direction, two adjacent battery cell groups are arranged staggeredly, and / or the battery cell and the first connector are connected by ultrasonic welding, and / or the battery cell group and the second connector are connected by ultrasonic welding.

[0015] According to some embodiments of the present application, the battery pack further comprises: a cold plate arranged between two adjacent battery cell groups.

[0016] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0018] Figure 1 is a structural schematic diagram of a battery pack according to an embodiment of the present utility model;

[0019] Figure 2 is a top view of a battery pack according to an embodiment of the present utility model;

[0020] Figure 3 is an exploded view of a battery pack according to an embodiment of the present utility model;

[0021] Figure 4 is a structural schematic diagram of a battery pack according to an embodiment of the present utility model, wherein the insulating support is not shown;

[0022] Figure 5 is a top view of a battery pack according to an embodiment of the present utility model, wherein the insulating support is not shown;

[0023] Figure 6 is a schematic diagram of an electrical connection relationship of a battery pack according to an embodiment of the present utility model.

[0024] Reference signs:

[0025] 100, battery pack;

[0026] 10, cell group; 11, cell; 12, positive electrode; 13, negative electrode; 111, first cell; 112, second cell;

[0027] 20, first connecting piece; 21, first sub connecting piece;

[0028] 30, second connecting piece; 31, second sub connecting piece;

[0029] 40, insulating support; 41, connecting part; 42, third avoiding hole; 411, first avoiding hole; 412, second avoiding hole; 413, groove;

[0030] 51, positive electrode busbar; 52, negative electrode busbar;

[0031] 60, joint. DETAILED DESCRIPTION

[0032] The embodiments of the present utility model will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and cannot be understood as a limitation of the present utility model.

[0033] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model.

[0034] In the description of the utility model, "first feature" and "second feature" can include one or more features, and "multiple" means two or more than two, and "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them, and "above", "above" and "above" the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0035] The battery pack 100 according to the embodiments of the utility model will be described below with reference to the drawings.

[0036] Referring to Figures 1-6 The battery pack 100 according to the embodiments of the utility model can include: a cell group 10.

[0037] Specifically, the cell group 10 includes a plurality of (equal to or greater than two) cells 11 arranged along a first direction, and adjacent two cells 11 are connected in series through a first connecting piece 20, so that the series connection of the plurality of cells 11 can be realized, the power demand of the battery pack 100 can be met, and the cell group 10 is a plurality of cells arranged along a second direction, the first direction and the second direction are perpendicular, and adjacent two cell groups 10 are connected in parallel through a second connecting piece 30, so that the low-voltage demand of the battery pack 100 can be met while ensuring the power of the battery pack 100, and the efficient energy storage and release of the battery pack 100 can be ensured. At the same time, the current sharing between the plurality of cell groups 10 can be ensured through the second connecting piece 30, the reliable operation of the battery pack 100 can be ensured, and when thermal runaway occurs in one of the cell groups 10, the second connecting piece 30 can disconnect the cell group 10 that occurs thermal runaway, so as to prevent the other normal cell group 10 from charging the cell group 10 that occurs thermal runaway and aggravating the degree of harm of thermal runaway, that is, the second connecting piece 30 can play the role of a fuse, and the use safety of the battery pack 100 can be ensured. For example, the cell 11 can be a large cylindrical cell.

[0038] In addition, asFigures 1-5 As shown, the first connecting piece 20 and the second connecting piece 30 are split pieces, facilitating the connection of the plurality of battery cells 11 and the plurality of battery cell groups 10, ensuring the flexibility of the connection of the plurality of battery cells 11 and the plurality of battery cell groups 10, and being capable of realizing the connection requirement of different positions. Compared with the integrated aluminum tab, nickel tab or nickel-plated copper in the related art, the structure of the first connecting piece 20 and the second connecting piece 30 is simple, and the production cost can be reduced.

[0039] In the embodiment of the present application, the number of the battery cell groups 10 can be flexibly set according to actual conditions. For example, the battery cell groups 10 can be four, as shown in the figure, or two, three, five, six or more, which are all within the protection scope of the present application. Figure 5

[0040] In some embodiments, the first connecting piece 20 and the second connecting piece 30 can be formed by cutting an aluminum strip, which is simple in structure and convenient for processing and manufacturing, avoiding the need for stamping, cutting and other operations of the punching integrated aluminum tab, nickel tab or nickel-plated copper in the related art, and being capable of avoiding waste and reducing production cost.

[0041] According to the battery pack 100 of the embodiment of the present application, the adjacent two battery cells 11 are connected in series through the first connecting piece 20, and the adjacent two battery cell groups 10 are connected in parallel through the second connecting piece 30, which ensures the low-voltage requirement of the battery pack 100 while ensuring the battery capacity of the battery pack 100, ensures the efficient energy storage and release of the battery pack 100, and the second connecting piece 30 can ensure the current sharing and safety protection between the plurality of battery cell groups 10, ensuring the safety of the battery pack 100. At the same time, the first connecting piece 20 and the second connecting piece 30 are split pieces, which can ensure the flexibility of the connection of the plurality of battery cells 11 and the plurality of battery cell groups 10, facilitate the realization of the connection requirement of different positions, and are simple in structure, capable of reducing production cost.

[0042] In some embodiments of the present application, as shown in the figure, the first connecting piece 20 includes a plurality of first sub-connecting pieces 21, and the plurality of first sub-connecting pieces 21 are arranged along the second direction. Figures 1-5 The plurality of first sub-connecting pieces 21 are all connected in series with the adjacent two battery cells 11, so that the plurality of first sub-connecting pieces 21 can realize the current carrying and overcurrent of the adjacent two battery cells 11, ensure the stability and reliability of current transmission, meet the required series connection requirement, and ensure safety.

[0043] In the embodiment of the present application, the number of the first sub-connecting pieces 21 can be flexibly set according to actual conditions. For example, the first sub-connecting pieces 21 can be three, as shown in the figure, or two, four, five, six or more, which are all within the protection scope of the present application. Figure 5 The plurality of first sub-connecting pieces 21 are all connected in series with the adjacent two battery cells 11, so that the plurality of first sub-connecting pieces 21 can realize the current carrying and overcurrent of the adjacent two battery cells 11, ensure the stability and reliability of current transmission, meet the required series connection requirement, and ensure safety.​

[0044] For example, the capacity of the electric core 11 is 30 Ah, the maximum charge-discharge rate of the battery pack 100 is 4C, and the current carrying capacity of the first sub connector 21 is 40A, so that the current carrying capacity of the battery pack 100 can be met by three first sub connectors 21, and the required connection requirement is met.

[0045] According to some embodiments of the utility model, as shown in Figures 1-6 The second connector 30 includes a plurality of (equal to or greater than two) second sub connectors 31, and the plurality of second sub connectors 31 are arranged at intervals along the first direction. The second sub connector 31 is connected in parallel to the electric core 11 of the adjacent two electric core groups 10. Thus, the plurality of second sub connectors 31 can ensure the current sharing between the plurality of electric cores 11. When thermal runaway occurs in one of the electric cores 11, the second connector 30 can disconnect the electric core 11 that has thermal runaway, preventing the other normal electric core 11 from charging the electric core 11 that has thermal runaway and aggravating the degree of harm of thermal runaway, and further ensuring the use safety of the battery pack 100.

[0046] In some embodiments of the utility model, as shown in Figure 1 , Figure 3 and Figure 4 The middle part of the second sub connector 31 protrudes away from the electric core 11, which can avoid the second sub connector 31 from contacting other structures and causing short circuit and other problems, ensuring the safety of the battery pack 100, and the structure is simple and convenient for processing and manufacturing.

[0047] According to some embodiments of the utility model, as shown in Figures 1-3 The plurality of electric cores 11 include a first electric core 111 and a second electric core 112 arranged at intervals along the first direction. The first electric core 111 and the second electric core 112 both have a positive electrode 12 and a negative electrode 13. The battery pack 100 further includes an insulating support 40 arranged on one side of the electric core 11. The insulating support 40 can play an insulating role, avoiding short circuit and other problems between the plurality of electric cores 11 and other structures, and ensuring the use safety of the battery pack 100.

[0048] In addition, as shown in Figures 1-5As shown, the insulation support 40 is provided with a connecting portion 41 located between the first and second battery cells 111 and 112, the connecting portion 41 is provided with a first avoiding hole 411 and a second avoiding hole 412, the first avoiding hole 411 can avoid the positive electrode 12 of the first battery cell 111, and the second avoiding hole 412 can avoid the negative electrode 13 of the second battery cell 112, so that the positive electrode 12 of the first battery cell 111 and the negative electrode 13 of the second battery cell 112 are exposed. The first connecting piece 20 is located on the connecting portion 41, and the two ends of the first connecting piece 20 in the length direction are connected to the positive electrode 12 of the first battery cell 111 and the negative electrode 13 of the second battery cell 112 respectively, so that the two ends of the first connecting piece 20 in the length direction can extend into the first avoiding hole 411 and the second avoiding hole 412 respectively, facilitating the connection of the first connecting piece 20 with the positive electrode 12 of the first battery cell 111 and the negative electrode 13 of the second battery cell 112, thereby realizing the series connection of the first and second battery cells 111 and 112 and ensuring the connection stability of the battery cell 11.

[0049] In some embodiments, as Figure 3 As shown, the battery cell 11 comprises a shell body and a pole, the pole is arranged on the shell body, the shell body can form the negative electrode 13 of the battery cell 11, and the pole can form the positive electrode 12 of the battery cell 11, facilitating the connection of the first connecting piece 20 with the battery cell 11 and ensuring the connection reliability, which is beneficial to improve the assembly efficiency.

[0050] In some embodiments of the utility model, as Figures 1-3 As shown, the connecting portion 41 is further provided with a groove 413, the groove 413 is communicated with the first avoiding hole 411 and the second avoiding hole 412, part of the first connecting piece 20 is located in the groove 413, and the end face of the first connecting piece 20 away from the battery cell 11 is retracted in the groove 413, so that the height of the first connecting piece 20 does not exceed the depth of the groove 413, the first connecting piece 20 can be insulated and protected and supported, avoiding the contact between other external structures and the first insulation piece to cause short circuit and other problems, and the use safety of the battery pack 100 can be ensured.

[0051] According to some embodiments of the utility model, as Figures 1-3 As shown, the insulation support 40 is further provided with a third avoiding hole 42, the connecting portion of the battery cell 11 can be exposed through the third avoiding hole 42, and the second connecting piece 30 is located in the third avoiding hole 42, so that the second connecting piece 30 can be connected in parallel with the adjacent two battery cell groups 10, and the parallel connection of the adjacent two battery cell groups 10 can be realized. For example, the third avoiding hole 42 is formed as an elongated hole.

[0052] In some embodiments of the utility model, as Figures 1-6As shown, the battery pack 100 further comprises a positive busbar 51 and a negative busbar 52, the positive busbar 51 and the negative busbar 52 are located at the side of the insulating support 40 away from the cell group 10 (for example Figure 3 As shown in the upper side in the middle), and the positive busbar 51 and the negative busbar 52 are respectively located at both ends of the length direction of the insulating support 40, and the insulating support 40 can meet the insulation requirements of the positive busbar 51 and the negative busbar 52, so as to avoid short circuit and other problems.

[0053] In addition, as shown Figures 1-5 The positive busbar 51 is connected with the first connecting piece 20 connected with the positive electrode 12 of the cell 11 located at the outermost end of the length direction of the cell group 10, so as to meet the connection requirements between the positive electrodes 12 of the plurality of cell groups 10, and the negative busbar 52 is connected with the first connecting piece 20 connected with the negative electrode 13 of the cell 11 located at the outermost end of the length direction of the cell group 10, so as to meet the connection requirements between the negative electrodes 13 of the plurality of cell groups 10, facilitate the connection requirements between the plurality of cell groups 10 and the external structure, and facilitate the centralized input and output of current.

[0054] In some embodiments, as shown Figures 1-5 In the second direction, the adjacent two cell groups 10 are staggered, so that the plurality of cells 11 in the adjacent cell groups 10 are staggered, ensuring compact structure and improving space utilization.

[0055] In some embodiments, the cell 11 and the first connecting piece 20 are ultrasonic welded, ensuring reliable connection, and if welding is poor, the cell 11 and the first connecting piece 20 can be re-welded, avoiding the problem that laser welding is easy to cause welding abnormalities and damage the cell 11 or the first connecting piece 20, and facilitating automation and improving assembly efficiency.

[0056] In some embodiments, the cell group 10 and the second connecting piece 30 are ultrasonic welded, ensuring reliable connection, and if welding is poor, the cell group 10 and the second connecting piece 30 can be re-welded, avoiding the problem that laser welding is easy to cause welding abnormalities and damage the cell group 10 and the second connecting piece 30, and facilitating automation and improving assembly efficiency.

[0057] According to some embodiments of the utility model, the battery pack 100 further comprises a cold plate, the cold plate is arranged between the adjacent two cell groups 10, and the cold plate can heat exchange the cell group 10, meet the temperature requirements of the cell group 10, so as to ensure the normal use of the battery pack 100. For example, the cold plate can be an S-shaped cold plate.

[0058] For example, when a low-temperature refrigerant is introduced into the cold plate, the cold plate can dissipate heat from the cell assembly 10, reducing the risk of safety hazards caused by the heat generated by the cell assembly 10, and ensuring the charging performance, lifespan, and safety performance of the battery pack 100.

[0059] For example, when a high-temperature refrigerant is introduced into the cold plate, the cold plate can heat the cell assembly 10, which facilitates the charging and discharging of the battery pack 100 when the outside temperature is low, ensuring that the battery pack 100 can work normally.

[0060] In some embodiments, such as Figures 1-5 As shown, the battery pack 100 is also provided with multiple connectors 60, which are connected to multiple cold plates respectively, so that the refrigerant can enter or flow out of the cold plate through the connectors 60, which facilitates the circulation of the refrigerant and ensures good heat exchange effect on the cell assembly 10.

[0061] Other configurations and operations of the battery pack 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0062] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0063] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises: a cell group comprising a plurality of cells arranged at intervals along a first direction, two adjacent cells being connected in series by a first connecting piece, the cell group being a plurality of groups arranged at intervals along a second direction, two adjacent cell groups being connected in parallel by a second connecting piece, the first connecting piece and the second connecting piece being separate pieces, wherein the first direction and the second direction are perpendicular.

2. The battery pack of claim 1, wherein, The first connecting piece comprises a plurality of first sub-connecting pieces arranged along the second direction, and each of the plurality of first sub-connecting pieces connects two adjacent cells in series.

3. The battery pack of claim 1, wherein, The second connecting piece comprises a plurality of second sub-connecting pieces arranged at intervals along the first direction, and each of the second sub-connecting pieces connects the cells of two adjacent cell groups in parallel.

4. The battery pack of claim 3, wherein, The middle part of the second sub-connecting piece protrudes away from the cell.

5. The battery pack of claim 1, wherein, The plurality of cells comprises a first cell and a second cell arranged at intervals along the first direction, and each of the first cell and the second cell has a positive electrode and a negative electrode, and the battery pack further comprises: an insulating support arranged on one side of the cell, the insulating support being provided with a connecting portion between the first cell and the second cell, the connecting portion being provided with a first avoiding hole for avoiding the positive electrode of the first cell and a second avoiding hole for avoiding the negative electrode of the second cell, and the first connecting piece being arranged on the connecting portion and having two ends connected to the positive electrode of the first cell and the negative electrode of the second cell, respectively.

6. The battery pack of claim 5, wherein, The connecting portion is further provided with a groove, the groove being in communication with the first avoiding hole and the second avoiding hole, part of the first connecting piece being arranged in the groove, and the end surface of the first connecting piece away from the cell being recessed in the groove.

7. The battery pack of claim 5, wherein, The insulating support is further provided with a third avoiding hole, and the second connecting piece is arranged in the third avoiding hole to connect two adjacent cell groups in parallel.

8. The battery pack of claim 5, wherein, The battery pack further comprises: a positive bus bar and a negative bus bar, the positive bus bar and the negative bus bar being arranged on the side of the insulating support away from the cell group and at the two ends of the insulating support in the length direction, the positive bus bar being connected to a plurality of first connecting pieces connecting the positive electrodes of the cells at the outermost ends of the cell group in the length direction, and the negative bus bar being connected to a plurality of first connecting pieces connecting the negative electrodes of the cells at the outermost ends of the cell group in the length direction.

9. The battery pack of claim 1, wherein, Along the second direction, two adjacent cell groups are arranged alternately; and / or, the cell and the first connecting piece are connected by ultrasonic welding; and / or, the cell group and the second connecting piece are connected by ultrasonic welding.

10. The battery pack of claim 1, wherein, Further comprising: a cold plate arranged between two adjacent cell groups.

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