Battery unit and battery pack having same

Abstract

The utility model provides a battery unit and a battery pack with the battery unit. The battery unit comprises a plurality of battery cells and a busbar for connecting the plurality of battery cells in a telecommunication manner, each battery cell has the same curvature bending along the thickness direction, and the plurality of battery cells are stacked along the thickness direction; output electrodes are respectively arranged on the two end faces of each battery cell in the length direction, and the two output electrodes located on the same end face of the two adjacent battery cells are distributed on the two sides of the center line of the battery cells; and the busbar covers and is electrically connected to the two output electrodes on the same end face of the two adjacent battery cells. According to the utility model, the heat dissipation performance of the bus-bar is improved, and the bus-bar is ensured to work at normal temperature, so that the safety and the use quality of a vehicle are improved.

Description

Technical Field

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

[0002] The battery unit is an important component of the vehicle; in a pure electric vehicle equipped with only a battery unit, the battery unit is the only driving source of the vehicle's drive system; in a hybrid vehicle equipped with an engine and a battery unit, the battery unit can serve as both a power source for the drive system and an auxiliary power source.

[0003] In the related technology, the battery unit contains multiple cells, and the output electrodes of the cells are connected by a bus. At this stage, the new energy industry is developing rapidly, and the charging rate requirements for vehicle battery units are getting higher and higher to achieve the purpose of short-term fast charging. Under high-power charging, the heat generated by the cells increases, and the bus also generates heat. The heat accumulation of the bus makes it difficult to dissipate heat, resulting in a temperature rise, which in turn reduces battery safety and affects the quality of vehicle use. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery unit to improve the heat dissipation performance of the bus bar and ensure that the bus bar works at a normal temperature, so as to enhance the safety and use quality of the vehicle.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery unit, comprising: a plurality of battery cells, each of which has the same curvature along the thickness direction, and the plurality of battery cells are stacked along the thickness direction; output electrodes are respectively provided on both end faces in the length direction of each battery cell, and the two output electrodes located on the same end face of two adjacent battery cells are distributed on both sides of the center line of the battery cell;

[0007] The busbar covers and is electrically connected to the two output electrodes on the same end surface of two adjacent battery cells.

[0008] Furthermore, the end surface of the battery cell in the length direction where each of the output electrodes is located is a vertical plane.

[0009] Furthermore, the two output electrodes located on the same end surface of two adjacent battery cells are arranged obliquely, and the length direction of each output electrode has the same angle with the center line of the battery cell.

[0010] Furthermore, the two output electrodes of the same battery cell are located on the same side of the center line of the battery cell.

[0011] Furthermore, an insulating layer is coated outside the adjacent battery cells.

[0012] Furthermore, a pressure relief hole is provided on the battery core.

[0013] Furthermore, the busbar is constructed as a special-shaped plate.

[0014] Furthermore, the busbar is constructed in a hexagonal shape.

[0015] Furthermore, the busbar includes two outer contour edges located at opposite corners, and two connecting edges connecting the two outer contour edges; each of the outer contour edges includes a first outer contour edge and a second outer contour edge that follow the adjacent length edges and width edges of the output electrode.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The battery unit described in the utility model is provided with two output electrodes located on the same side end surface of two adjacent battery cells, so that they are respectively distributed on both sides of the center line in the width direction of the battery cell. This arrangement allows the busbar to have more installation space, and at the same time facilitates the busbar to have a larger span, thereby increasing the flow area and heat dissipation area. The increase in the flow area and the heat dissipation area reduces the heat generation during the use of the battery unit, and increases the heat dissipation during the use of the battery unit, ensuring the normal working temperature of the busbar and improving the safety and use quality of the vehicle.

[0018] The battery cells are arranged to have the same curvature along the thickness direction, so that the battery cells themselves have the ability to resist swelling, reduce the risk of swelling and deformation of the battery cells, and improve the safety and use quality of the vehicle. At the same time, due to the curvature of the battery cells, the deformation trend has the characteristics of directional deformation, thus avoiding random deformation of the battery cells, thereby reducing the gap required for battery cell assembly and the space required to absorb the expansion material. The integrity of the battery cells is improved, the volume of the battery cells is reduced, and the assembly and protection of the battery cells are facilitated. The safety and use quality of the vehicle are improved.

[0019] Secondly, the end face of the cell length direction where each output electrode is located is a vertical plane, which is convenient for connecting the busbar on the output electrode and fixing it with the busbar bracket, thereby improving the convenience of battery cell production. At the same time, when the cells are arranged in multiple rows, the end face is set as a vertical plane, shortening the distance between two adjacent rows of cells. After the overall assembly of the battery cell is completed, it is convenient to protect the battery cell.

[0020] In addition, due to the curved curvature of the battery cell, the end surface area for installing the output electrode is specific and has a certain curvature. By setting the inclined output electrode, the output electrode has a larger connection area for electrical connection with the busbar, thereby increasing the flow area. At the same time, by setting the output electrodes with the same inclination angle, it is convenient to connect the busbars of the same specifications to the output electrodes, and the busbars of the same specifications are conducive to the installation of the busbar bracket.

[0021] By providing an insulating layer, adjacent cells or cells are insulated from surrounding components; the safety of the battery unit is improved. By providing a pressure relief hole, the pressure relief inside the cell is adjusted to reduce the internal pressure of the cell and avoid the cell from exploding. By providing a special-shaped busbar with a first outer edge and a second outer edge, the flow area of ​​the busbar is ensured while reducing the overall area of ​​the busbar, and the materials required to make the busbar are reduced.

[0022] The utility model also provides a battery pack, comprising the battery unit as described above.

[0023] The battery pack of the utility model, by assembling the battery cells as described above, improves the heat dissipation performance of the vehicle battery pack, reduces heat accumulation in the battery cells, thereby reducing the use risk of the battery cells, improving the safety of vehicle use, and improving the use quality of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 The first embodiment of the present utility model is a schematic diagram showing the arrangement of battery cells;

[0026] Figure 2 The first embodiment of the present utility model is a schematic diagram showing a bus bar;

[0027] Figure 3 This is a schematic diagram of a display frame according to the first embodiment of the utility model;

[0028] Figure 4 The first embodiment of the utility model is a schematic diagram showing the transmission of the internal pressure of the battery cell along the side plate;

[0029] Figure 5 The first embodiment of the present utility model is a schematic diagram showing a heat transfer unit;

[0030] Figure 6 The first embodiment of the utility model is a schematic diagram showing the pressure relief hole being located on the frame plate;

[0031] Figure 7The first embodiment of the present invention is a cross-sectional view showing an insulating layer.

[0032] Description of reference numerals: 1. battery cell;

[0033] 101, frame; 1011, side plate; 1012, frame plate; 102, cover plate;

[0034] 2. Output electrode;

[0035] 201, positive electrode; 202, negative electrode;

[0036] 3. Busbar;

[0037] 301, first outer contour edge; 302, second outer contour edge; 303, connecting edge;

[0038] 4. Insulation layer;

[0039] 5. Pressure relief hole;

[0040] 501, sealing plug;

[0041] 6. Heat transfer unit;

[0042] 7. Centerline;

[0043] β, angle. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0045] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0048] Embodiment 1

[0049] The present embodiment relates to a battery unit to solve the problem of poor heat dissipation performance of a bus bar 3 used to connect two adjacent battery cells 1 in an existing battery unit, thereby improving the safety and use quality of a vehicle.

[0050] In terms of overall structure, the battery unit includes a plurality of battery cells 1, each of which has the same curvature along the thickness direction, and the plurality of battery cells 1 are stacked along the thickness direction; output electrodes 2 are respectively provided on both end faces in the length direction of each battery cell 1, and the two output electrodes 2 located on the same side end faces of two adjacent battery cells 1 are distributed on both sides of the center line 7 of the battery cell 1;

[0051] The busbar 3 covers and electrically connects two output electrodes 2 on the same end surface of two adjacent battery cells 1 .

[0052] As configured above, the battery unit of this embodiment is distributed on both sides of the center line 7 in the width direction of the battery cell 1 by arranging two output electrodes 2 located on the same side end surface of two adjacent battery cells 1. That is, one of the two output electrodes 2 on the same side end surface of two adjacent battery cells 1 is a positive electrode 201 and the other is a negative electrode 202. Compared with the existing adjacent battery cells 1, the output electrodes 2 are arranged in the same row in the center. The bus 3 has more installation space, and at the same time, it is convenient for the bus 3 to have a larger span, thereby increasing the flow area and heat dissipation area; the increase in the flow area and the increase in the heat dissipation area, thereby reducing the heat generation during the use of the battery unit, and increasing the heat dissipation during the use of the battery unit. Ensuring the normal operating temperature of the bus 3 improves the safety and use quality of the vehicle.

[0053] By setting the battery cell 1 to have the same curvature along the thickness direction, the battery cell 1 itself has the ability to resist swelling, reducing the risk of swelling and deformation of the battery cell 1, and improving the safety and use quality of the vehicle. At the same time, due to the curvature of the battery cell 1, its deformation trend has the characteristics of directional deformation, thereby avoiding random deformation, reducing the gap required for battery cell assembly and the space required for absorbing expansion materials, thereby increasing the integrity of the battery, reducing the volume of the battery cell, and facilitating the assembly and protection of the battery cell. The safety and use quality of the vehicle are improved.

[0054] Based on the above overall introduction, refer to Figures 1 to 3, the battery cell 1 includes at least one pair of opposite hard side panels 1011. In this embodiment, the battery cell 1 has a pair of hard side panels 1011; the opposite side panels 1011 are parallel and arc-shaped, that is, the side panels 1011 have the same curvature. The side panels 1011 of multiple battery cells 1 in the same row are stacked in the same direction; the battery cells 1 are arranged in a single row or multiple rows. The two side panels 1011 are set on the left and right sides of the battery cell 1. The battery cell 1 also includes a frame plate 1012 located on the upper and lower sides of the two side panels 1011 and integrally formed with the side panels 1011 to form a frame body 101. The frame plate 1012 is in the shape of a flat plate; and a sealing plate 102 fixed on the frame body 101 to form a shell of the battery cell 1. The output electrode 2 is connected to the sealing plate 102. The frame plate 1012 and the sealing plate 102 are hard plates. Compared with the existing thin-film soft-pack battery unit, the hard side plates 1011, frame plates 1012 and sealing plates 102 have a better tendency to resist swelling and deformation.

[0055] The frame plate 1012 is in the form of a flat plate. Figures 1 to 4 , during the assembly of the battery cell, it is convenient to constrain the upper and lower surfaces of the battery cell 1 group; and because the side plate 1011 is arc-shaped, when the battery cell is used, if the battery cell 1 swells inside; the curved surface of the side plate 1011 can realize the transmission of the internal pressure along the surface of the side plate 1011, thereby realizing effective anti-swelling. When the battery cell 1 has a tendency to swell inside, the internal pressure will be transmitted from the arched surface of the side plate 1011 to the frame plate 1012. The integrally formed frame 101 has better integrity and stronger anti-swelling ability than the frame 101 formed by welding or riveting. When the battery cell 1 is large inside and the side plate 1011 cannot offset and deforms, the side plate 1011 realizes directional deformation under the condition of constraining the upper and lower frame plates 1012, avoiding random deformation, and reducing the gap required for the assembly of the battery cell and the space required for absorbing the expansion material. At the same time, the integrally formed frame 101 reduces the risk of tearing at the connection between the side plate 1011 and the frame plate 1012.

[0056] In order to improve the heat dissipation performance of the battery cell, refer to Figures 1 to 5 The upper and lower surfaces of the battery cell 1 are both provided with a heat conduction unit 6, which is used to quickly reduce the temperature of the battery cell 1. The heat conduction unit 6 can be a conventional heat conduction unit 6 known to those skilled in the art, such as a heat conduction pad or a heat conduction coating, etc., as long as it can reduce the temperature of the battery cell 1. The flat frame plate 1012 can better contact with the heat conduction unit 6, quickly reduce the temperature of the battery cell 1, and improve the safety and use quality of the vehicle.

[0057] In order to facilitate the arrangement of the battery cells 1 during the assembly of the battery unit; Figures 1 to 5, the end face of the battery cell 1 in the length direction where each output electrode 2 is located is a vertical plane, that is, the outer surface of the sealing plate 102 is a vertical plane. The output electrode 2 is connected to the sealing plate 102, which is convenient for connecting the busbar 3 connected to the output electrode 2 and fixing it to the busbar bracket, thereby improving the convenience of battery cell production. At the same time, when the battery cells 1 are arranged in multiple rows, the end face is set as a vertical plane, which shortens the interval between two adjacent rows of battery cells 1, reduces the overall volume of the battery cell after assembly, and facilitates the protection of the battery cell.

[0058] In order to further facilitate the assembly of the battery cell and increase the flow area of ​​the output electrode 2, refer to Figures 1 to 2 , the two output electrodes 2 located at the same end face of two adjacent battery cells 1 are arranged at an angle, and the length direction of each output electrode 2 is the same as the angle β between the center line 7 of the battery cell 1. Since the end face area where the output electrode 2 is installed is specific and has a certain curvature, by setting the inclined output electrode 2, the output electrode 2 has a larger connection area for electrical connection with the bus 3, thereby increasing the flow area. At the same time, by setting the output electrodes 2 with the same inclination angle, it is convenient to connect the bus 3 of the same specification to the output electrode 2, and the bus 3 of the same specification is conducive to the installation of the bus 3 bracket.

[0059] The purpose of distributing the two output electrodes 2 on the same side end surface of two adjacent battery cells 1 on both sides of the center line 7 in the width direction of the battery cell 1 is to facilitate stacking multiple battery cells 1 in sequence. The two output electrodes 2 at both ends of the same battery cell 1 are located on the same side of the center line 7 in the width direction of the battery cell 1. When the positive and negative output electrodes 2 of two adjacent battery cells 1 are staggered, it is only necessary to adjust the position of the positive and negative electrodes 202 of the battery cell 1 as needed with the center line 7 perpendicular to the side plate 1011 as the rotation axis. The battery cell 1 arranged in this way also has the effect of facilitating production and assembly. It is also convenient to achieve that the length direction of the above-mentioned output electrode 2 is the same as the angle β of the center line 7 of the battery cell 1.

[0060] In order to ensure the flow area of ​​the busbar 3 and reduce the material consumption when manufacturing the busbar 3; Figures 1 to 2 , the busbar 3 is constructed as a special-shaped plate. Specifically, the busbar 3 is constructed as a hexagon. The hexagonal busbar 3 includes an outer contour edge located at the diagonal, and two connecting edges 303 connecting the two outer contour edges; each outer contour edge has a first outer contour edge 301 and a second outer contour edge 302 that follow the adjacent length edge and width edge of the output electrode 2. By setting the hexagonal busbar 3, the material consumption during the production of the busbar 3 is reduced while ensuring the flow area of ​​the busbar 3. By setting the first outer contour edge 301 and the second outer contour edge 302, the connection area between the busbar 3 and the output electrode 2 is ensured. At the same time, the setting of the two outer contour edges can facilitate the assembly of the busbar 3 and the output electrode 2 by the robot arm or the staff. The busbar 3 set in this way also has the effect of facilitating production.

[0061] In order to further increase the safety of the battery cell 1, refer to Figure 3 and Figure 6 , to adjust the internal pressure of the battery cell 1, a pressure relief hole 5 is opened on the battery cell 1, and a sealing plug 501 is filled in the pressure relief hole 5; specifically, the pressure relief hole 5 can be opened in the frame plate 1012 or in the sealing plate 102; the pressure relief hole 5 can discharge the internal pressure of the battery cell 1 to prevent the battery from overheating and has the function of protecting the battery. At the same time, the sealing plug 501 can make the battery cell 1 waterproof.

[0062] In order to ensure the safety and reliability of the battery and reduce the risk of explosion and fire of the battery unit caused by leakage or short circuit of the battery cell 1, the adjacent battery cells 1 are coated with an insulating layer 4. In this embodiment, the insulating layer 4 is made of a plastic partition as a raw material, and the insulating layer 4 made of the plastic partition is wrapped around the outside of each battery cell 1. The insulating layer 4 can also be made of other materials; for example, glue insulation is used to coat the surface of the battery cell 1 with a layer of insulating glue to isolate adjacent battery cells 1; or shielding film insulation is used to achieve the insulation effect by sticking a shielding film on the surface of the battery cell 1, and the shielding film has excellent electrical insulation and moisture resistance; or environmentally friendly cardboard is used as a raw material to make the insulating layer 4; environmentally friendly cardboard does not contain chemical components and has the characteristics of environmental protection and safety.

[0063] When the battery unit of this embodiment is in use, multiple battery cells 1 having the same curvature along the thickness direction can be stacked into one or more rows along the thickness direction; at the same time, the two output electrodes 2 located on the same side end surface of two adjacent battery cells 1 are adjusted to be distributed on both sides of the center line 7 of the battery cell 1; to complete the overall arrangement of the battery cell 1. When multiple battery cells 1 are arranged along the thickness direction of the battery cell 1, an insulating layer 4 is provided between two adjacent battery cells 1 to prevent the battery cell 1 from short-circuiting, which causes the temperature of the battery cell 1 to rise. The adjacent battery cells 1 are then fixed using the busbar 3 and the electrical connection between the two adjacent battery cells 1 is achieved. Before placing a single row or multiple rows of battery cells 1 in the lower shell of the battery unit, a heat conduction unit 6 is first laid in the lower shell; before covering the upper shell of the battery unit, the arranged heat conduction unit 6 is also placed above the battery cell 1; to achieve heat dissipation of the battery cell 1.

[0064] By setting the battery cell 1 to have the same curvature along the thickness direction, the battery cell 1 has the ability to resist swelling, reducing the risk of swelling and deformation of the battery cell 1, thereby improving the safety and use quality of the vehicle. At the same time, due to the curvature of the battery cell 1, its deformation trend has the characteristics of directional deformation, thereby avoiding random deformation, reducing the gap required for battery cell assembly, and reducing the space required for absorbing swelling materials; thereby increasing the integrity of the battery, reducing the volume of the battery cell, and facilitating the assembly and protection of the battery cell. The safety and use quality of the vehicle are improved.

[0065] Embodiment 2

[0066] The present embodiment relates to a battery pack, including the battery unit described above. The battery pack of the present embodiment is equipped with the battery unit described above, which improves the heat dissipation performance of the battery pack, reduces the heat accumulation of the battery unit, and thus reduces the use risk of the battery unit, improves the safety of vehicle use, and improves the use quality of the vehicle.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A plurality of battery cells, each of which has the same curvature along the thickness direction, and the plurality of battery cells are stacked along the thickness direction; output electrodes are respectively provided on both end faces in the length direction of each battery cell, and the two output electrodes located on the same end face of two adjacent battery cells are distributed on both sides of the center line of the battery cell; The busbar covers and is electrically connected to the two output electrodes on the same end surface of two adjacent battery cells.

2. The battery cell according to claim 1, characterized in that: The end surface of the battery core in the length direction where each of the output electrodes is located is a vertical plane.

3. The battery cell according to claim 1, characterized in that: The two output electrodes located on the same end surface of two adjacent battery cells are arranged obliquely, and the length direction of each output electrode has the same angle with the center line of the battery cell.

4. The battery cell according to claim 1, characterized in that: The two output electrodes of the same battery cell are located on the same side of the center line of the battery cell.

5. The battery cell according to claim 1, characterized in that: The adjacent battery cores are coated with an insulating layer.

6. The battery unit according to claim 1, characterized in that: A pressure relief hole is provided on the battery core.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The busbar is configured in the form of a profiled plate.

8. The battery unit according to claim 7, characterized in that: The busbars are designed in a hexagonal shape.

9. The battery unit according to claim 8, characterized in that: The busbar includes two outer contour edges located at opposite corners and two connecting edges connecting the two outer contour edges; each of the outer contour edges includes a first outer contour edge and a second outer contour edge that follow the adjacent length edges and width edges of the output electrode.

10. A battery pack, characterized in that: The battery pack is provided with the battery unit as claimed in any one of claims 1 to 9.

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