Battery module and electric device

Abstract

The utility model provides a battery module and a power utilization device, the battery module comprises a plurality of battery cells, each battery cell comprises a first tail end and a second tail end, and the first tail end is provided with a tab; the first cover plate and the second cover plate are respectively arranged at the first tail end and the second tail end of the battery cell; the plastic bracket is arranged between the first cover plate and the second cover plate; the first cover plate and the second cover plate are both provided with step-shaped connecting positions, each connecting position comprises a planar support supporting portion, the plastic support is provided with a main body portion and an extending portion protruding outwards from the main body portion, the extending portion is constructed to be a planar protrusion, and the main body portion and the extending portion are connected through the step-shaped connecting positions. The extension part abuts against the support supporting part and is supported by the support supporting part. The plastic bracket for the battery module is convenient to mount and stable in positioning, and the assembly efficiency and the safety performance of the battery module are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery module and an electrical device. Background Art

[0002] In recent years, with the continuous development of soft-pack batteries, they have been widely used in the power and energy storage fields due to their many advantages such as high safety performance, light weight, high energy density, low internal resistance, good cycle performance, long service life and flexible design.

[0003] A battery module composed of cells of soft-pack batteries usually has a bracket on the side of the battery assembly where the pole ear is provided, so as to restrain the pole ear through the bracket, and effectively reduce the risk of the pole ear being loose and the pole ear bending toward the electrode assembly side; at the same time, the bracket also needs to position and fix each series row in the battery module. In the prior art, the bracket is generally fixed on the side plate or the upper and lower cover plates of the battery module. The bracket needs to be pre-installed before being fixed, and the bracket is difficult to install when fixed. Especially when multiple brackets are needed in the battery module, the assembly difficulty of fixing multiple brackets at the same time is greater; and the battery cell pole ear must be pre-fixed before laser welding. The bracket positioning method is unique and difficult to position, which easily leads to poor contact between the pole ear and the series row, affecting the performance stability of the entire battery module. Utility Model Content

[0004] The purpose of the utility model is to provide a battery module to solve the problem that the bracket in the battery module in the prior art is difficult to install, which easily causes the poor contact between the pole ear and the series row. The battery module of the utility model includes: a plurality of battery cells, each of which includes a first end and a second end, and the first end is provided with a pole ear; an upper cover plate and a lower cover plate, which are respectively arranged at the first end and the second end of the battery cell; a plastic bracket, which is arranged between the upper cover plate and the lower cover plate; the upper cover plate and the lower cover plate are both provided with a step-shaped connection, and the connection includes a planar bracket support portion, and the plastic bracket is provided with a main body and an extension portion protruding outward from the main body, and the extension portion is constructed as a planar protrusion, and the extension portion abuts against the bracket support portion and is supported by the bracket support portion.

[0005] Furthermore, the connection also includes a limiting portion perpendicular to the bracket support portion, and the limiting portion can limit the movement of the plastic bracket.

[0006] Furthermore, the connection point also includes a connecting portion, and the limiting portion is arranged between the bracket supporting portion and the connecting portion.

[0007] Furthermore, a series row for connecting the tabs is included, the plastic bracket includes two tab accommodating holes, and the tabs are connected to the series row through the tab accommodating holes.

[0008] Furthermore, the plastic support further includes a guide portion, and the guide portion can guide the tab to pass through the plastic support.

[0009] Furthermore, the guide portion is provided with a guide slope.

[0010] Furthermore, the plastic bracket further comprises a limiting column, and a receiving hole is provided on the series row, and the limiting column can be inserted into the receiving hole to limit the movement of the series row.

[0011] Furthermore, an insulating plate is provided with a mounting hole, the upper cover plate is provided with a connecting hole, and screws pass through the mounting hole and the connecting hole respectively to connect the upper cover plate with the insulating plate.

[0012] The utility model also provides an electric device using the battery module.

[0013] The battery module and the electrical device of the utility model have a plastic bracket that is easy to install and has stable positioning, which greatly improves the assembly efficiency of the battery module and the safety performance of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall schematic diagram of the battery module of the utility model;

[0015] Figure 2 It is a partial exploded schematic diagram of the battery module of the utility model;

[0016] Figure 3 It is a partial schematic diagram of the upper cover of the battery module of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the bracket in the battery module of the utility model;

[0018] Figure 5 It is a partial cross-sectional view of the bracket in the battery module of the utility model;

[0019] Figure 6 It is a three-dimensional diagram of a battery module in series in the utility model;

[0020] Figure 7 It is a cross-sectional schematic diagram of the connection between the upper cover, the lower cover and the bracket in the battery module of the utility model. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] The utility model defines the vertical direction as the up-down direction; the direction perpendicular to the up-down direction is defined as the left-right direction and is arranged parallel to the up-down direction; the third direction perpendicular to the up-down direction and the left-right direction is the front-back direction.

[0023] like Figure 2 As shown, the battery module of the present invention includes an upper cover plate 10, a lower cover plate 70, a first side plate 20, a second side plate 30, a plurality of battery cells 60, and a plastic bracket 50, a series row 80 and an insulating plate 40 arranged on both sides of the battery cells.

[0024] The battery module of the utility model is installed according to the following steps: the lower cover plate 70 is horizontally arranged on a flat installation table, and then a plurality of battery cells 60 are stacked in parallel on the lower cover plate 70 in sequence. After the plurality of battery cells 60 are stacked, the first side plate 20 and the second side plate 30 are stacked on both sides of the battery cells 60 in the left and right directions respectively, and then the upper cover plate 10 is stacked on the top of the battery cells in the up and down directions, and then the first side plate 20, the second side plate 30, the upper cover plate 10 and the lower cover plate 70 are welded into a whole by welding. After the battery module shell is welded , and then install multiple plastic brackets 50 in sequence between the upper cover 10 and the lower cover 70. When the plastic bracket 50 is installed, the pole ear 601 on the battery cell passes through the plastic bracket 50, so that at least a part of the pole ear of the battery cell is exposed outside the plastic bracket 50, and then the series row 80 is installed on the plastic bracket 50, and then the pole ear 601 is welded to the series row 80, so that the plastic bracket 50 and the series row 80 are fixed, and finally the insulating plate 40 is installed and fixed between the upper cover 10 and the lower cover 70 to protect the series row 80 from being interfered by external substances.

[0025] The structures and functions of the main components of the utility battery module will be described in detail below in conjunction with the accompanying drawings to illustrate the working principle of the utility battery module in detail.

[0026] like Figure 2-3 As shown, the battery module of the utility model includes an upper cover plate 10 and a lower cover plate 70. The structure, size and function of the upper cover plate 10 and the lower cover plate are basically the same, so only the structure of the upper cover plate 10 and its working principle are described in detail here, and the detailed description of the structure of the lower cover plate 70 is omitted.

[0027] The upper cover plate 10 is formed into a roughly rectangular shape and can be machined from an aluminum plate. Of course, it can also be made of other metal materials or composite materials. The upper cover plate 10 mainly includes a battery cell support plate 104 composed of a main body for supporting the battery cell 60 and a connection with the plastic bracket 50. The connection of the utility model includes a connection portion 103 bent from the battery cell support plate 104, a limiting portion 102 bent from the connection portion 103, and a bracket support portion 101 bent from the limiting portion 102. The bracket support portion 101 is constructed in a planar shape and is perpendicular to the limiting portion 103, wherein the connection between the connection portion 103, the limiting portion 102 and the bracket support portion 102 is formed in a stepped shape as a whole. The connecting portion 103 is configured to be connected to the insulating plate 40. In the present embodiment, a connecting hole 1031 is provided in the connecting portion 103 and can be aligned with a mounting hole (not shown) on the insulating plate 40. A screw or a rivet or the like is passed through the connecting hole 1031 and the mounting hole on the insulating plate 40 respectively to fix the insulating plate 40 to the upper cover plate 10 and the lower cover plate 70.

[0028] The plastic bracket 50 is constructed in a roughly rectangular shape, and is provided with two tab accommodating holes 505 to allow the tabs 601 on the battery cell 60 to pass through. At the same time, a guide portion 503 is provided on one side of the plastic bracket 50 to guide the tabs 601 to pass through the plastic bracket 50 smoothly. A guide slope 5031 is provided on the guide portion 503. When the plastic bracket 50 is installed in the battery assembly, the tabs 601 can pass through the tab accommodating holes 505 along the guide slope 5031 and extend out of the plastic bracket. The plastic bracket of this embodiment is also provided with a limiting column 504 that can be inserted into the mounting hole 801 on the series row so that the series row 80 and the plastic bracket 50 can be relatively fixed. The plastic bracket 50 is innovatively provided with an extension portion 501 protruding from the main body 502, and the extension portion 501 can contact and be supported by the bracket support portion 101 of the upper cover plate 10.

[0029] like Figure 7 The figure shows the connection method of the plastic bracket, the upper cover plate 10, the lower cover plate 70 and the series connection row 80 in the battery module of the present invention.

[0030] After the upper cover plate 10, the lower cover plate 70, the first side plate 20 and the second side plate 30 are welded together, the plastic bracket is installed between the upper cover plate 10 and the lower cover plate 70 along the left and right directions. During installation, the extension 501 on one side of the plastic bracket abuts against the bracket support portion 101 of the upper cover plate, and the extension 101 on the other side abuts against the bracket support portion 701 in the lower cover plate 70. During the installation process, since the extension 101 of the plastic bracket is a plane, the bracket support portion 701 is also a plane, and the planes are in contact with each other. Compared with the installation method of the prior art in which the groove and protrusion are inserted between the plastic bracket and the upper and lower cover plates, the plastic bracket installation efficiency is higher, and the contact area is large due to the contact method of the plane and the plane. In addition, since multiple plastic brackets need to be installed in the battery module, the assembly speed can be significantly increased and the assembly cost of the battery assembly can be saved. Since the connection between the upper and lower covers and the plastic bracket 50 is formed in a step shape, especially the limiting part 102 of the upper cover and the limiting part 702 on the lower cover can limit the plastic bracket 50 from moving in the up and down directions. During the installation of the plastic bracket 50, the pole ear 601 of the battery cell passes through the pole ear receiving hole 505 of the plastic bracket through the guiding effect of the guiding inclined surface 5031 in the guiding part 503, and a part is exposed outside the plastic bracket 50 and welded with the series row installed on the plastic bracket. The plastic bracket 50 of the utility model is provided with two limiting columns 504 to form a tight fit with the mounting hole 801 on the series row, so when the series row 80 is welded with the pole ear 601, the series row can be supported by the bracket support part 101, 702 and limited by the limiting part 102, 702 together with the plastic bracket, and stably located between the upper cover 10 and the lower cover 70, so that the welding process can be stably supported to achieve the stability of the welding process, while improving the welding efficiency. After welding, the insulating plate 40 is installed between the upper cover plate and the lower cover plate. Specifically, the insulating plate 40 is supported by the connecting portion 103 on the upper and lower cover plates. Since the connecting portion 103 is formed as a plane as a whole, the supporting area is large, and the insulating plate 40 can be stably supported by the connecting portion 103 of the upper and lower cover plates, and a plurality of connecting holes 1031 are provided on the connecting portion 103. The connecting holes 1031 are aligned with the connecting holes (not shown) of the insulating plate 40, and the insulating plate 40 is fixed to the upper cover plate 10 and the lower cover plate 70 by screws or bolts. In this embodiment, the front and rear ends of the battery cell 60 are provided with pole ears, so the front and rear ends of the battery module are respectively provided with plastic brackets, series rows and insulating plates. Optionally, if the battery cell in the battery module is designed to have pole ears at only one end, then the plastic bracket, series row and insulating plate only need to be provided at one end in the battery module. Although the plastic bracket is arranged between the upper cover plate and the lower cover plate in the present embodiment, if the arrangement of the battery cells is changed during the design of the battery module and the battery cell tabs are arranged at both ends in the upper and lower directions, the plastic bracket can also be arranged between the first side plate and the second side plate.

[0031] Obviously, the above embodiments of the present invention are only examples for the purpose of clearly explaining the present invention.

[0032] It is not a limitation of the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A battery module, comprising: A plurality of battery cells, each of the battery cells comprising a first end and a second end, wherein the first end is provided with a tab; An upper cover plate and a lower cover plate, respectively disposed at the first end and the second end of the battery cell; A plastic bracket, arranged between the upper cover plate and the lower cover plate; It is characterized in that the upper cover plate and the lower cover plate are both provided with a step-shaped connection, the connection includes a planar bracket support portion, the plastic bracket is provided with a main body portion and an extension portion protruding outward from the main body portion, the extension portion is constructed as a planar protrusion, the extension portion abuts against the bracket support portion and is supported by the bracket support portion.

2. The battery module according to claim 1, characterized in that: The connection also includes a limiting portion perpendicular to the support portion of the bracket, and the limiting portion can limit the movement of the plastic bracket.

3. The battery module according to claim 2, characterized in that: The connection point also includes a connecting portion, and the limiting portion is arranged between the bracket supporting portion and the connecting portion.

4. The battery module according to claim 1, characterized in that: It also includes a series row connecting the tabs, the plastic bracket includes two tab accommodating holes, and the tabs are connected to the series row through the tab accommodating holes.

5. The battery module according to claim 1, characterized in that: The plastic support further includes a guide portion, and the guide portion can guide the tab to pass through the plastic support.

6. The battery module according to claim 5, characterized in that: The guide portion is provided with a guide inclined surface.

7. The battery module according to claim 4, characterized in that: The plastic bracket further comprises a limiting column, and a receiving hole is provided on the series row, and the limiting column can be inserted into the receiving hole to limit the movement of the series row.

8. The battery module according to claim 1, characterized in that: It also includes an insulating plate with a mounting hole, the upper cover plate is provided with a connecting hole, and screws pass through the mounting hole and the connecting hole respectively to connect the upper cover plate with the insulating plate.

9. An electrical device, characterized in that: Comprising a battery module as described in any one of claims 1-8.

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