Battery pack

Abstract

The utility model relates to a battery pack which comprises a plurality of battery modules, each battery module comprises battery cells which are sequentially arranged in multiple rows and multiple columns, a first busbar used for connecting the battery cells in each row in series, and a second busbar used for connecting the battery cells in each column in series, the first busbar and the second busbar are respectively fixed on the two battery cells in two adjacent rows and two adjacent columns; each battery module also comprises two output rows which are fixedly connected with the two battery cells at the two ends of the battery module, a series row assembly which is propped against the output rows and is used for connecting a plurality of battery modules in series, and a fastener which is fixedly connected with the output rows and the series row assembly. According to the battery pack disclosed by the utility model, by changing the series connection mode of the battery cells, the locking points of fasteners can be reduced, so that the mounting efficiency is improved, the single-point failure risk of electric connection and the open circuit risk of the battery pack are reduced, and the use safety of the battery pack is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] As the output voltage of the battery pack increases, the number of battery cells connected in series, the number of series rows used, and the corresponding fastener locking points increase accordingly, which increases the risk of single-point failure of the electrical connection and the risk of the battery pack short circuit, thereby affecting the safety of the battery pack, increasing the complexity of installation and disassembly, and reducing the installation efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a battery pack with high safety and high installation efficiency.

[0004] To achieve the above-mentioned purpose, the utility model proposes a battery pack, comprising a plurality of battery modules, each of the battery modules comprising battery cells arranged in multiple rows and columns in sequence, a first bus for connecting the battery cells in each row in series, and a second bus for connecting the battery cells in each column in series, the first bus and the second bus being fixed to two battery cells in two adjacent rows and two adjacent columns, respectively; each of the battery modules also comprises two output rows fixedly connected to the two battery cells at both ends of the battery module, a series row assembly abutting the output row for connecting multiple battery modules in series, and a fastener fixedly connecting the output row and the series row assembly.

[0005] Furthermore, the battery module also includes two end plates and a connecting belt sleeved outside the two end plates, and the multiple battery cells are clamped between the two end plates. The connecting belt is used to cooperate with the end plates so that two adjacent battery cells are against each other to limit the relative position between the multiple battery cells.

[0006] Furthermore, each of the battery modules also includes an output terminal, the output terminal portion is embedded in one end of the end plate close to the output row and is clamped with the end plate, the output row portion is clamped between the series row assembly and the output terminal and is fixedly connected to each other by the fastener.

[0007] Furthermore, the first busbar and the second busbar each include a first connection portion and a second connection portion respectively welded to two adjacent battery cells, and a transition portion connecting the first connection portion and the second connection portion.

[0008] Optionally, the transition portion is arched, and the first connecting portion and the second connecting portion protrude outward from ends close to each other to form the transition portion.

[0009] Furthermore, there are two output rows in each module, and the two output rows are fixedly connected to the two battery cells in the first and last rows respectively, one of the output rows is welded to the positive electrode of one battery cell, and the other output row is welded to the negative electrode of another battery cell.

[0010] Furthermore, the plurality of battery modules are arranged in multiple rows and columns, and the series row assembly includes a first series row abutting against the output rows of two adjacent columns, a second series row abutting against the output rows of two adjacent rows, and two total series rows for connecting external loads, respectively abutting against two output rows away from the second series row.

[0011] Optionally, the battery module further comprises a heat insulating sheet fixedly connected to the battery cell.

[0012] Optionally, the battery module further includes a first insulating member fixedly connected to the end plate, and a second insulating member fixedly connected to the edges of the battery cells at both ends of the battery module.

[0013] Optionally, the battery module further includes a plurality of adjustment sheets, which are respectively bonded between the first insulating member and the end plate and between the thermal insulation sheet and the battery cell.

[0014] Compared with the prior art, the technical solution of the utility model has the following beneficial effects: the battery pack of the utility model can reduce the locking points of fasteners by changing the series connection method between battery cells, thereby improving installation efficiency, reducing the risk of single-point failure of electrical connections and the risk of battery pack short circuit, and thus improving the safety of battery pack use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic structural diagram of a battery pack according to an embodiment of the present utility model.

[0017] Figure 2 An exploded view of a battery pack according to an embodiment of the present invention.

[0018] Figure 3 FIG. 1 is a schematic diagram of a series connection of battery packs according to an embodiment of the present invention.

[0019] In the figure:

[0020] 10-battery module; 11-battery cell;

[0021] 21-first busbar; 22-second busbar; 23-output busbar; 24-first connecting hole; 25-first connecting portion; 26-second connecting portion; 27-transition portion;

[0022] 30-series row assembly; 31-first series row; 32-second series row; 33-total series row; 34-second connection hole;

[0023] 41 - end plate; 42 - connection belt; 50 - output terminal; 61 - first insulating member; 62 - second insulating member; 71 - heat insulation sheet; 72 - adjustment sheet. DETAILED DESCRIPTION

[0024] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of description and simplified description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the utility model.

[0026] The terms "first", "second", etc. are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0027] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0028] See also Figure 1 The utility model provides a battery pack, including a plurality of battery modules 10. In one embodiment, the battery pack is configured in a 1P104S manner. Specifically, the plurality of battery modules 10 are sequentially connected in series, and each battery module 10 includes a plurality of rows and columns of battery cells 11 sequentially connected in series, and each battery module 10 includes at least two rows and at least two columns of battery cells 11 arranged in a display.

[0029] In one embodiment, the multiple cells 11 of each battery module 10 are arranged in a multi-row and multi-column array along the first direction and the second direction, and each battery module 10 further includes a first bus 21 for connecting the cells 11 in each row in series and a second bus 22 for connecting the cells 11 in each column in series, and the first bus 21 and the second bus 22 are respectively fixed to two cells 11 in two adjacent rows and two adjacent columns. Figure 1 As shown, in this embodiment, the first direction is the length direction of the battery pack, and the second direction is the width direction of the battery pack.

[0030] See also Figure 2 Furthermore, each battery module 10 further includes an output row 23, a series row assembly 30 and a fastener. There are two output rows 23, which are respectively fixedly connected to the two battery cells 11 at both ends of the battery module 10. The fasteners can be screws or bolts. Specifically, the two output rows 23 are respectively fixedly connected to the two battery cells 11 in the first and last rows, one of the output rows 23 is welded to the positive electrode of one battery cell 11, and the other output row 23 is welded to the negative electrode of the other battery cell 11.

[0031] The series row assembly 30 is abutted against the output row 23 through a fastener. The series row assembly 30 is used to connect multiple battery modules 10 in series. The fastener is used to fix the output row 23 and the series row assembly 30. Optionally, the series row assembly 30 is made of copper. Specifically, the series row assembly 30 includes a first series row 31, a second series row 32 and a total series row 33. The first series row 31 abuts against two adjacent columns of output rows 23, the second series row 32 abuts against two adjacent rows of output rows 23, and the total number of series rows 33 is two. The two total series rows 33 abut against two output rows 23 away from the second series row 32, respectively, for connecting an external load.

[0032] In one embodiment, the first busbar 21 and the second busbar 22 each include a first connection portion 25 and a second connection portion 26 respectively welded to two adjacent battery cells 11, and a transition portion 27 connecting the first connection portion 25 and the second connection portion 26. Preferably, the transition portion 27 is arched, and the first connection portion 25 and the second connection portion 26 protrude outward from the ends close to each other to form the transition portion 27. The first busbar 21 and the second busbar 22 are preferably made of aluminum, and the arched transition portion 27 combined with the aluminum material having a certain ductility can adapt to the gap between adjacent battery cells 11, avoiding the impact of assembly errors on the performance of the battery pack.

[0033] See also Figure 3In one embodiment, the battery cells 11 in the battery module 10 are connected in series by first connecting two battery cells 11 in adjacent columns in the second direction through the second bus bar 22 from the output row 23, then connecting two battery cells 11 in adjacent rows in the first direction through the first bus bar 21, and then connecting two battery cells 11 in adjacent columns in the second direction through the second bus bar 22, and the series connection of multiple rows and columns of battery cells 11 in each battery module 10 is realized in turn. By changing the battery pack series connection method, the number of series row components 30 can be reduced, thereby reducing the number of fasteners used to connect the series row components 30 and the output row 23, facilitating installation and disassembly, improving installation efficiency, reducing costs and weight, improving the compactness of the battery pack structure, and reducing the risk of single-point failure of electrical connections and the risk of battery pack short circuits, thereby improving the safety of battery pack use.

[0034] In one embodiment, the number of battery modules 10 is 4, each module includes two rows and multiple columns of battery cells 11, and the two rows of battery cells 11 are close to each other at one end, one is the positive electrode, and the other is the negative electrode. One of the first connecting part 25 and the second connecting part 26 is welded to the positive electrode of the battery cell 11, and the other is welded to the negative electrode of the battery cell 11.

[0035] In one embodiment, positive poles and negative poles connected to the positive poles of the battery cell 11 and the negative poles of the battery cell 11 are also provided at both ends of the battery cell 11, and the first busbar 21 and the second busbar 22 are fixedly connected to the positive poles and the negative poles respectively by welding or bolting. Specifically, the positive poles and negative poles of the two battery cells 11 in two adjacent columns and two adjacent rows are oppositely arranged. For example, the battery cells 11 in the first row are away from one end of the battery cells 11 in the second row, and the negative poles and positive poles are arranged alternately in sequence along the first direction, and the battery cells 11 in the second row are away from one end of the battery cells 11 in the first row, and the positive poles and negative poles are arranged alternately in sequence along the first direction.

[0036] In some embodiments, the battery module 10 further includes two end plates 41 and a connecting belt 42, the connecting belt 42 is sleeved outside the two end plates 41, the number of the connecting belt 42 can be one or more, preferably two, and the connecting belt is preferably made of metal such as steel. Multiple battery cells 11 are sandwiched between the two end plates 41, and the connecting belt 42 is used to cooperate with the end plates 41 so that two adjacent battery cells 11 are offset against each other to limit the relative position between the multiple battery cells 11.

[0037] Furthermore, each battery module 10 further includes an output terminal 50, which is partially embedded in one end of the end plate 41 near the output row 23 and is clamped with the end plate 41, and the output row 23 is partially sandwiched between the series row assembly 30 and the output terminal 50 and fixedly connected to each other by fasteners. In one embodiment, a threaded hole is provided on the output terminal 50, and a first connection hole 24 and a second connection hole 34 for fasteners to pass through are provided on the output row 23 and the series row assembly 30, respectively, and the fasteners are sequentially connected to the first connection hole 24 and the second connection hole 34, and are threadedly connected to the threaded holes, so that the output row 23 is sandwiched between the series row assembly 30 and the output terminal 50.

[0038] Optionally, the battery module 10 further includes a heat insulating sheet 71 fixedly connected to the battery cell 11. The heat insulating sheet 71 is preferably a mica sheet and is bonded between adjacent battery cells 11 by an adhesive to isolate heat, thereby protecting the battery pack in situations such as thermal runaway.

[0039] The battery module 10 further includes a first insulating member 61 fixedly connected to the end plate 41, and a second insulating member 62 fixedly connected to the edges of the battery cells 11 at both ends of the battery module 10. Both the first insulating member 61 and the second insulating member 62 are preferably made of PC (polycarbonate), which can prevent short circuits between the battery cells 11 in the battery pack and electrical contact between the battery pack and the external environment, thereby enhancing the safety of the battery pack. The material has high strength and high toughness, and low density, which can protect the battery pack and reduce the weight of the battery pack.

[0040] The battery module 10 further includes a plurality of adjustment sheets 72, which are respectively bonded between the first insulating member 61 and the end plate 41 and between the heat insulating sheet 71 and the battery cell 11 by adhesives or the like. The adjustment sheets 72 are preferably flame-retardant foam. Since the battery cell 11 undergoes a slight volume change during the charge and discharge process due to the influence of temperature and other reasons, the adjustment sheets 72 can absorb the stress generated by the volume change, reduce mechanical damage, and extend the battery life. In addition, the adjustment sheets 72 can further isolate heat and prevent heat diffusion caused by thermal runaway of a single battery cell 11, thereby reducing the risk of thermal runaway of the entire battery pack.

[0041] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The invention comprises a plurality of battery modules (10), each of the battery modules (10) comprising battery cells (11) arranged in a plurality of rows and columns, a first bus bar (21) for connecting the battery cells (11) in series in each row, and a second bus bar (22) for connecting the battery cells (11) in series in each column, wherein the first bus bar (21) and the second bus bar (22) are respectively fixed to two battery cells (11) in two adjacent rows and two adjacent columns; each of the battery modules (10) further comprises two output bars (23) fixedly connected to the two battery cells (11) at two ends of the battery module (10), a series bar assembly (30) abutting against the output bars (23) for connecting the plurality of battery modules (10) in series, and a fastener fixedly connecting the output bars (23) and the series bar assembly (30).

2. The battery pack according to claim 1, characterized in that: The battery module (10) further comprises two end plates (41) and a connecting belt (42) sleeved outside the two end plates (41); the plurality of battery cells (11) are sandwiched between the two end plates (41); the connecting belt (42) is used to cooperate with the end plates (41) so that two adjacent battery cells (11) are pressed against each other to limit the relative positions between the plurality of battery cells (11).

3. The battery pack according to claim 2, characterized in that: Each of the battery modules (10) further comprises an output terminal (50), wherein a portion of the output terminal (50) is embedded in one end of the end plate (41) close to the output row (23) and is snap-connected to the end plate (41), and a portion of the output row (23) is sandwiched between the series row assembly (30) and the output terminal (50) and is fixedly connected to each other via the fastener.

4. The battery pack according to claim 1, characterized in that: The first busbar (21) and the second busbar (22) both comprise a first connection portion (25) and a second connection portion (26) respectively welded to two adjacent battery cells (11), and a transition portion (27) connecting the first connection portion (25) and the second connection portion (26).

5. The battery pack according to claim 4, characterized in that: The transition portion (27) is arched, and the first connecting portion (25) and the second connecting portion (26) protrude outward from ends close to each other to form the transition portion (27).

6. The battery pack according to claim 1, characterized in that: The number of the output rows (23) in each battery module (10) is two, and the two output rows (23) are respectively fixedly connected to the two battery cells (11) in the first and last rows, one of the output rows (23) is welded to the positive electrode of one of the battery cells (11), and the other output row (23) is welded to the negative electrode of the other of the battery cells (11).

7. The battery pack according to claim 6, characterized in that: The plurality of battery modules (10) are arranged in a plurality of rows and columns, and the series row assembly (30) comprises a first series row (31) abutting against the output rows (23) of two adjacent columns, a second series row (32) abutting against the output rows (23) of two adjacent rows, and two total series rows (33) for connecting to an external load, respectively abutting against two output rows (23) away from the second series row (32).

8. The battery pack according to claim 2, characterized in that: The battery module (10) further comprises a heat insulating sheet (71) fixedly connected to the battery core (11).

9. The battery pack according to claim 8, characterized in that: The battery module (10) further comprises a first insulating member (61) fixedly connected to the end plate (41), and a second insulating member (62) fixedly connected to the edges of the battery cells (11) at both ends of the battery module (10).

10. The battery pack according to claim 9, characterized in that: The battery module (10) further comprises a plurality of adjustment sheets (72), wherein the plurality of adjustment sheets (72) are respectively bonded between the first insulating member (61) and the end plate (41) and between the heat insulating sheet (71) and the battery cell (11).

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