Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. In the battery module, a battery cell group comprises a plurality of battery cells stacked along a set direction, the battery cell group is provided with a top surface parallel to the set direction, a bottom surface opposite to the top surface and two opposite side surfaces, and a pole of any battery cell is positioned on the side surface; the two end plates are respectively clamped on two sides of the battery cell group along a set direction; the conductive block is mounted on the surface, deviating from the battery cell, of the end plate in a set direction; the connecting bar assemblies are electrically connected with the pole columns of the plurality of battery cells on the side surfaces, and part of the connecting bar assemblies extend and protrude out of the end plates in the set direction and are electrically connected with the conductive blocks. The pole columns of the plurality of battery cells are arranged on the side surface, the connecting row assembly is also electrically connected with the pole columns of the plurality of battery cells on the side surface, and the connecting row assembly is also connected with the conductive block in the set direction, so that the pole columns, the connecting row assembly and the conductive block do not occupy the space in the height direction of the battery cell group; therefore, the battery module is flattened and is suitable for application scenes with limited height space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery module and a battery pack. BACKGROUND

[0002] At present, for square battery modules, the market is mostly the "top out pole" scheme, that is, the poles of each battery cell in the battery module are located at the top of the battery module, and the electrical connection of each pole in the battery module is also made in the top space. Therefore, the poles and electrical connections in the battery module need to occupy the top space, which leads to the fact that the battery module cannot be designed to be flat, and thus cannot be applied to application scenarios with limited height space. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide a battery module that can be applied to application scenarios with limited height space, and further to provide a battery pack with the battery module.

[0004] In a first aspect, the embodiments of the present application provide a battery module, comprising:

[0005] a battery cell group comprising a plurality of battery cells stacked in a predetermined direction, the battery cell group having a top surface, a bottom surface and two side surfaces each parallel to the predetermined direction, the top surface and the bottom surface being oppositely arranged, and the two side surfaces being oppositely arranged, the distance between the top surface and the bottom surface being smaller than the distance between the two side surfaces; and

[0006] two end plates clamped on both sides of the battery cell group along the predetermined direction;

[0007] a conductive block mounted on the surface of the end plate away from the battery cell along the predetermined direction; and

[0008] a connection strip assembly electrically connected to the poles of the plurality of battery cells at the side surface, and part of the connection strip assembly extending out of the end plate along the predetermined direction and being electrically connected to the conductive block.

[0009] In the above battery module, the poles of the plurality of battery cells are arranged at the side surface, the connection strip assembly is electrically connected to the poles of the plurality of battery cells at the side surface, and the connection strip assembly is also connected to the conductive block in the predetermined direction. In this way, the poles, the connection strip assembly and the conductive block do not occupy the space in the height direction of the battery cell group, which is conducive to the flat design of the battery module, and makes the battery module applicable to application scenarios with limited height space.

[0010] In one of the embodiments, the battery module comprises an insulating member, and the insulating member is arranged between the end plate and the corresponding battery cell.

[0011] In one of the embodiments, the insulating member comprises a main body and a wrapping edge, the main body is arranged between the end plate and the battery cell, and the wrapping edge is connected to the side of the main body facing the end plate and wraps around the periphery of the end plate.

[0012] In one of the embodiments, the wrapping edge extends along the edge of the main body in a ring shape and cooperates with the main body to form a receiving groove capable of receiving at least part of the end plate.

[0013] In one of the embodiments, the battery module comprises a flexible filling member, the flexible filling member is flexible and filled between the insulating member and the battery cell.

[0014] In one of the embodiments, the filling member is a microcellular foam filling cotton.

[0015] In one of the embodiments, the battery module comprises a heat insulation sheet, and the heat insulation sheet is arranged between any two adjacent battery cells to insulate the two battery cells on both sides of the heat insulation sheet.

[0016] In one of the embodiments, the battery module comprises a binding belt, and the binding belt is arranged around the periphery of the battery cell group and the two end plates to bind the battery cell group and the two end plates.

[0017] In one of the embodiments, the battery module comprises an insulating side plate, and the insulating side plate covers the connection row assembly and the conductive block.

[0018] In a second aspect, the embodiments of the present application provide a battery pack comprising the battery module.

[0019] In the above battery pack, the height direction space in the battery module is not occupied, so that the flat design can be realized, which is also helpful for the flat design of the battery pack, so that the battery pack can be applied to the application scenarios with limited height space. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1.

[0022] Figure 2 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1. Figure 1 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1.

[0023] Figure 3 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1. Figure 2 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1.

[0024] Figure 4 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1. Figure 1 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1.

[0025] Figure 5 A perspective structural schematic diagram of a battery module provided by an embodiment of the present application is shown in FIG. 1.

[0026] In the drawings, reference numerals:

[0027] 10, battery module; 100, battery cell group; 110, battery cell; 111, pole; 112, large face; 113, first outer surface; 114, second outer surface; 120, top face; 140, side face; 200, end plate; 210, connecting portion; 300, conductive block; 400, connecting row assembly; 410, connecting row; 411, output row; 412, input row; 500, insulating member; 510, main body; 520, edge wrapping; 530, accommodating groove; 600, flexible filling member; 700, heat insulation sheet; 800, binding belt; 900, insulating side plate; 20, battery pack; 30, shell; 31, liquid cooling plate; 32, box body; 40, transmission port. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0031] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0032] Please refer to Figures 1 to 4 , the battery module 10 provided by the embodiments of the application will be described. The battery module 10 includes a cell group 100, an end plate 200, a conductive block 300, and a connection bar assembly 400. The cell group 100 includes a plurality of cells 110 stacked in a predetermined direction, and the cell group 100 has a top surface 120, a bottom surface (not shown), and two side surfaces 140, all of which are parallel to the predetermined direction. The top surface 120 is arranged opposite to the bottom surface, and the two side surfaces 140 are arranged opposite to each other. The distance between the top surface 120 and the bottom surface is smaller than the distance between the two side surfaces 140. The pole 111 of any cell 110 is located at the side surface 140. The end plate 200 has two, and the two end plates 200 are clamped on both sides of the cell group 100 in the predetermined direction. The conductive block 300 is installed on the end plate 200. The connection bar assembly 400 is electrically connected to the side surface 140 and the pole 111 of the plurality of cells 110. Part of the connection bar assembly 400 extends out of the end plate 200 in the predetermined direction and is electrically connected to the conductive block 300.

[0033] It can be understood that for the cell 110, which is in the shape of a cube and has two large areas 112 and four small areas 112 connected between the two large areas 112, the plurality of cells 110 are stacked together in the predetermined direction perpendicular to the large area 112, and the two end plates 200 are arranged corresponding to the large area 112 of the two cells 110 at the head and tail. After the plurality of cells 110 are stacked, the cell group 100 as a whole is also in the shape of a cube.

[0034] For the four outer surfaces of the battery cell 110, two of them are opposite to each other. For the convenience of distinction, both of the two opposite outer surfaces are defined as the first outer surface 113, and the other two opposite outer surfaces are defined as the second outer surface 114. The distance between the two first outer surfaces 113 is greater than the distance between the two second outer surfaces 114, so that after the stacking of the plurality of battery cells 110, the two opposite first outer surfaces 113 of the plurality of battery cells 110 are aligned to form the two opposite sides 140 of the battery cell group 100, and the two opposite second outer surfaces 114 of the plurality of battery cells 110 are aligned to form the top surface 120 and the bottom surface opposite to the top surface 120 of the battery cell group 100, so that the distance between the top surface 120 and the bottom surface is less than the distance between the two sides 140, and thus the direction perpendicular to the top surface 120 and the bottom surface is also the height direction of the battery cell group 100, and the direction perpendicular to the side 140 is also the width direction of the battery cell group 100. As shown in FIG. 1, the X-axis is the given direction, the Y-axis is the width direction, and the Z-axis is the height direction, and the three axes are perpendicular to each other. Figure 1

[0035] Further, the pole 111 of the plurality of battery cells 110 is located on the side 140, and the connection bar assembly 400 is located on one side of the side 140, and the pole 111 of the plurality of battery cells 110 is electrically connected to the connection bar assembly 400, so that the connection bar assembly 400 can function as a bus bar for the plurality of battery cells 110, and the connection bar assembly 400 is electrically connected to the conductive block 300, so that the battery module 10 can realize unified input and output of signals through the conductive block 300 and the connection bar assembly 400.

[0036] It should be noted that the conductive block 300 has two, and the two conductive blocks 300 are respectively installed on the two end plates 200, one of which can be used as the input port of the signal, and the other can be used as the output port of the signal.

[0037] In this application, the conductive block 300 is installed on the surface of the end plate 200 away from the battery cell 110 in the given direction, and part of the connection bar assembly 400 protrudes to one side of the end plate 200 in the given direction and is connected to the conductive block 300. In this way, the external high-voltage device can be connected to the conductive block 300 in the given direction without occupying the space in the height direction.

[0038] ​In the present application, for the connection bar assembly 400, it includes a plurality of connection bars 410, any two adjacent electrode posts 111 of the plurality of battery cells 110 are electrically connected by one connection bar 410, the plurality of connection bars 410 are connected in series to connect the plurality of battery cells 110, among the plurality of connection bars 410, two connection bars 410 are connected to the electrode posts 111 of the first and last battery cells 110 and are not connected to other battery cells 110, so that one of the two connection bars 410 is defined as an input bar 412 as the input end of the series circuit, and the other is defined as an output bar 411 as the output end of the series circuit. The input bar 412 and the output bar 411 protrude to one side of the end plate 200 in a predetermined direction, and are respectively connected to the two conductive blocks 300.

[0039] Further, the plurality of connection bars 410 are all aluminum bars, which not only have good heat conduction performance, but also have a large area, so that the heat generated inside the battery cell 110 can be quickly conducted to the aluminum bar through the electrode post 111 and quickly dissipated through the aluminum bar.

[0040] Specifically, the connection bar assembly 400 further includes a wire harness (not shown), a temperature sensor (not shown), and a pressure sensor (not shown), etc. The temperature sensor and the pressure sensor can be connected to the connection bar 410 to detect the temperature and voltage of the connection bar 410, and the detection results are guided out through the wire harness. The wire harness extends in a predetermined direction and is connected to an external high-voltage device on the side of the end plate 200 away from the battery cell 110 in a predetermined direction.

[0041] In the above-mentioned battery module 10, by arranging the electrode posts 111 of the plurality of battery cells 110 on the side surface 140, the connection bar assembly 400 is also electrically connected to the electrode posts 111 of the plurality of battery cells 110 on the side surface 140, and the connection bar assembly 400 is also connected to the conductive block 300 in a predetermined direction. In this way, the electrode post 111, the connection bar assembly 400, and the conductive block 300 do not occupy the space in the height direction of the battery cell group 100, thereby facilitating the flat design of the battery module 10, and making the battery module 10 suitable for application scenarios with limited height space.

[0042] In combination Figures 2 to 4 As shown, in the present application, the battery module 10 includes an insulating member 500, and the insulating member 500 is arranged between the two end plates 200 and the corresponding battery cells 110. The insulating member 500 is used to insulate and isolate the end plates 200 and the battery cells 110 on both sides thereof. The arrangement of the insulating member 500 can insulate and isolate the battery cells 110 and the end plates 200, ensure that there is a distance between the end plates 200 and the battery cells 110 that meets the electrical safety specification, and avoid safety hazards. It can be understood that there are two insulating members 500, and the two insulating members 500 are arranged one by one corresponding to the two end plates 200.

[0043] Further, the insulation member 500 includes a main body 510 and a wrapping 520. The main body 510 is located between the end plate 200 and the battery cell 110. The wrapping 520 is connected to a side of the main body 510 facing the end plate 200 and wraps around the periphery of the end plate 200. It can be understood that the main body 510 corresponds to the large face 112 of the battery cell 110 and the surface of the end plate 200 opposite to the large face 112, so as to isolate the two. The wrapping 520 wraps around the end plate 200 from the periphery of the end plate 200 on the side of the main body 510 facing the end plate 200.

[0044] Specifically, the wrapping 520 extends along the edge of the main body 510 in a ring shape and cooperates with the main body 510 to form a containing groove 530 capable of containing at least part of the end plate 200. In this application, only a part of the end plate 200 close to the battery cell 110 is contained in the containing groove 530 in a predetermined direction. In other embodiments, the depth of the containing groove 530 can be set larger, so that the entire end plate 200 can be contained in the containing groove 530 in the predetermined direction. In this way, the end plate 200 contained in the containing groove 530 is completely insulated from the battery cell 110 under the wrapping of the insulation member 500. Specifically, the insulation member 500 is an insulation PC (polycarbonate) film.

[0045] Continuing to refer to Figures 2 to 4 In this application, the battery module 10 includes a flexible filling member 600, which is flexible and filled between the insulation member 500 and the battery cell 110. By arranging the flexible filling member 600 between the insulation member 500 and the battery cell 110, the assembly tolerance during the stacking of the plurality of battery cells 110 can be absorbed by the flexible filling member 600, which is flexible and can be deformed, thereby improving the group fault tolerance of the battery module 10.

[0046] Further, the flexible filling member 600 is a microporous foamed filling cotton. In this way, the flexible filling member 600 can effectively reduce the convection of gas due to the existence of micrometer-level pores on its surface, thereby effectively reducing the heat transfer caused by air convection, and further the flexible filling member 600 can have a lower, long-term stable low thermal conductivity depending on the pore structure, so as to block the heat generated by the battery cell 110 from being transmitted to the side of the end plate 200.

[0047] In this application, the battery module 10 includes a heat insulation sheet 700, which is arranged between any two adjacent battery cells 110 and is used for heat insulation of the two battery cells 110 located on both sides of the heat insulation sheet 700. It can be known that the plurality of battery cells 110 and the plurality of heat insulation sheets 700 are alternately stacked in a predetermined direction. The arrangement of the heat insulation sheet 700 can insulate the heat generated by the battery cell 110 from being conducted to the adjacent battery cell 110, thereby playing a role in protecting the safety of the adjacent battery cell 110.

[0048] Further, the heat insulation sheet 700 can be an aerogel heat insulation pad, which not only has a long service life and strong heat insulation and fireproof performance, but also can play a buffering function between the two battery cells 110 to avoid hard contact between the battery cells 110.

[0049] In combination Figures 1 to 3 As shown, in particular in the present application, the battery module 10 includes a binding belt 800, which is arranged around the periphery of the battery cell group 100 and the two end plates 200 to bind the battery cell group 100 and the two end plates 200. The two end plates 200 and the battery cell group 100 located between the two end plates 200 can be stably bound together as a whole by the binding belt 800. Specifically, the binding belt 800 has two, which are arranged in the width direction to increase the binding force and improve the stability of the structure as a whole.

[0050] Further, the end plate 200 is provided with a connecting portion 210 protruding from the surface of the end plate 200 in a predetermined direction away from the battery cell 110, which can be fixedly connected with the shell 30 (to be mentioned later) of the battery pack 20, so as to realize the relative fixation of the battery module 10 and the shell 30. The external high-voltage device can also be fixed on the shell 30, so as to be relatively fixed with the conductive block 300 to ensure the reliability of the electrical connection.

[0051] Specifically, the connecting portion 210 extends in the width direction of the surface of the end plate 200 to form a long strip, so that the connecting portion 210 can provide multiple connection positions for connecting with the shell 30, so as to realize the connection reliability of the battery module 10 and the shell 30.

[0052] Further, the two binding belts 800 are respectively located on the two sides of the connecting portion 210 and are symmetrically arranged in the width direction, so as to maintain the balance of the overall stress of the end plate 200 and the battery cell group 100.

[0053] In particular in the present application, the battery module 10 includes an insulating side plate 900, which covers the connecting row assembly 400 and the conductive block 300. By covering the connecting row assembly 400 and the conductive block 300 with the insulating side plate 900, an electrical insulation effect can be achieved to avoid the shell 30 wrapped therearound from being in contact with the connecting row assembly 400 and the conductive block 300 to be electrified.

[0054] In the present application, the insulating side plate 900 is bent to form a "U" shape to cover the top surface 120 and the two side surfaces 140 of the battery cell group 100. Compared with the scheme of arranging the insulating side plate 900 on the two side surfaces 140 respectively, the "U"-shaped insulating side plate 900 can utilize the top surface 120 to support the insulating side plate 900, without the need for additional connection and fixation of the insulating side plate 900.

[0055] The battery module 10 has good insulation and heat insulation performance, and thus has good safety.

[0056] In combination Figures 1 to 5 As shown in the drawings, the application also provides a battery pack 20 comprising the battery module 10. In the battery pack 20, the height direction space in the battery module 10 is not occupied, and thus the battery pack 20 can be designed to be flat, which is conducive to the flat design of the battery pack 20 as a whole, and thus the battery pack 20 can be applied to application scenarios with limited height space.

[0057] Further, the battery pack 20 comprises a housing 30 having a receiving cavity in which one or more battery modules 10 can be accommodated. The battery pack 20 further comprises a high-voltage device (not shown) disposed in the receiving cavity and electrically connected to the conductive blocks 300 on the battery modules 10 on one side of the battery modules 10 along a predetermined direction. The housing 30 is provided with a transmission port 40, and the high-voltage device is connected to the transmission port 40. An external device can interact with each battery module 10 through the transmission port 40 and the high-voltage device.

[0058] Specifically, the housing 30 comprises a liquid cooling plate 31 and a box body 32. The liquid cooling plate 31 is sealed to the opening of the box body 32 to jointly define the receiving cavity for accommodating the battery module 10. The liquid cooling plate 31 corresponds to the bottom surface of the cell group in the battery module, and the liquid cooling plate 31 can cool the battery module. The transmission port 40 is specifically arranged on the box body 32.

[0059] The above merely describes the preferred embodiments of the application and is not used to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A battery module, characterized in that, include: A battery cell assembly includes multiple battery cells stacked along a predetermined direction. The battery cell assembly has a top surface, a bottom surface, and two side surfaces, all parallel to the predetermined direction. The top surface and the bottom surface are positioned opposite each other, and the two side surfaces are positioned opposite each other. The distance between the top surface and the bottom surface is less than the distance between the two side surfaces. The terminal of any battery cell is located on one of the side surfaces. Two end plates are respectively clamped to both sides of the battery cell assembly along the predetermined direction; A conductive block is mounted on the end plate on the surface of the battery cell in the predetermined direction. and The connecting bus assembly is electrically connected to the terminals of the plurality of cells on the side, and a portion of the connecting bus assembly extends out of the end plate along the predetermined direction and is electrically connected to the conductive block.

2. The battery module according to claim 1, characterized in that, The battery module includes an insulating component, and the insulating component is provided between the two end plates and their corresponding battery cells. The insulating component is used to insulate and isolate the end plates and battery cells located on both sides of it.

3. The battery module according to claim 2, characterized in that, The insulating component includes a main body and an edge. The main body is located between the end plate and the battery cell. The edge is connected to the side of the main body facing the end plate and wraps around the periphery of the end plate.

4. The battery module according to claim 3, characterized in that, The edging extends in a ring along the edge of the body and together with the body forms a receiving groove capable of accommodating at least a portion of the end plate.

5. The battery module according to claim 2, characterized in that, The battery module includes a flexible filler that is flexible and fills the space between the insulating member and the battery cell.

6. The battery module according to claim 5, characterized in that, The flexible filler is microporous foamed filling cotton.

7. The battery module according to claim 1, characterized in that, The battery module includes a heat insulation sheet, which is disposed between any two adjacent battery cells. The heat insulation sheet is used to insulate the two battery cells located on both sides of it.

8. The battery module according to claim 1, characterized in that, The battery module includes a strap that is wrapped around the periphery of the cell assembly and the two end plates to bind the cell assembly to the two end plates.

9. The battery module according to claim 1, characterized in that, The battery module includes an insulating side plate, which covers the connecting bar assembly and the conductive block.

10. A battery pack, characterized in that, Includes the battery module as described in any one of claims 1 to 9.

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