CN218274876U - Battery unit and battery module - Google Patents

Abstract

The utility model relates to the field of batteries, and discloses a battery unit and a battery module. The battery unit includes a heat dissipation plate (1) having a housing chamber, an electric cell (2) located in the housing chamber, and brackets (3) connected to both ends of the heat dissipation plate (1), the bracket (3) An installation groove (31) is formed on the top, and an adapter piece (4) is connected to the tab of the battery core (2), and the adapter piece (4) is installed in the installation groove (31). In the utility model, the battery frame is formed by setting brackets at both ends of the cooling plate, the structure is simple and reliable, and meets the production requirements of mass production and automation; Assembly efficiency of battery cells. Moreover, multiple battery cells can be connected in series and parallel through the bus bar, without cutting out the position where the tabs pass through on the bus bar, reducing the thickness of the bus bar, thereby reducing the weight of the module and the production cost.

Description

Battery unit and battery module

technical field

The utility model relates to the technical field of batteries, in particular to a battery unit. On this basis, it also relates to a battery module.

Background technique

In the field of new energy batteries, large modules composed of lithium-ion batteries have great advantages in improving system energy density and integration efficiency, and have been widely used. The structure of the large module of soft-packed lithium-ion battery is complicated. Usually, because the soft-packed battery cell itself does not have structural strength, it needs strong structural parts to complete the protection of the battery cell and the realization of the module structure. At the same time, the series-parallel connection between the cells Good insulation is required, and the busbar usually needs to be carried by a carrier, which further increases the complexity of the soft package module structure, and the increase in the number of parts increases the process difficulty and cost.

In addition, the cells of traditional soft-pack lithium-ion battery modules are usually placed in the frame, and the tabs of the cells are arranged on both sides of the module. After the battery tab is bent, laser welding is required to form a firm connection between the tab and the bus bar; since the copper bar at the insertion position of the tab needs to be opened to avoid, resulting in a reduction in the flow area, it is necessary to thicken the copper bar. This increases the cost of raw materials. For the sake of process feasibility and insulation protection, the busbar of the existing soft-pack module usually needs another part to carry the fixed load. The effect of the carrier part of the busbar and the injection molded part on the frame overlaps, which further leads to an increase in cost. . Moreover, due to the thin thickness of the lugs of the soft-packed cells, only the copper tabs can be welded to the copper bars during bus welding, so the selection of bus bars can only consider copper bars or copper-aluminum composite bars. However, the cost of copper bars is high and the weight is heavy, which directly affects the grouping efficiency of modules and the cost of raw materials. In order to solve the problems in the grouping process of traditional soft-pack modules, for example, only copper bars or copper-aluminum composite bars can be used for confluence, and the traditional soft-pack module bus bars avoid the insertion position of battery tabs due to openings. To ensure the overcurrent area, only thicken the copper bar, the copper bar used is usually more than 2mm, and the traditional soft-packed battery grouping scheme is complicated and there are many parts.

Utility model content

The purpose of the utility model is to overcome the problem of low assembly efficiency of the battery module in the prior art, and provide a battery unit which has the advantage of improving the assembly efficiency of the battery module.

In order to achieve the above object, the first aspect of the utility model provides a battery unit, the battery unit includes a heat dissipation plate with an accommodation cavity, an electric cell located in the accommodation cavity, and brackets connected to both ends of the heat dissipation plate, the A mounting groove is formed on the bracket, and an adapter piece is connected to the tab of the battery cell, and the adapter piece is installed in the installation groove.

Optionally, buckles are provided on a side of the support away from the accommodating cavity, and/or positioning pins and/or positioning holes are provided at both ends of the support along the stacking direction of the battery cells.

Optionally, the positioning pins and the positioning holes are respectively provided at the ends of the support along the stacking direction of the electric cores.

Optionally, the bracket includes a first side wall and a second side wall located at both ends along the stacking direction of the battery cells, the first side wall is provided with a first positioning pin and a first positioning hole, so The second side wall is provided with a second positioning pin and a second positioning hole; wherein, the first positioning pin is coaxial with the second positioning hole, and the second positioning pin is coaxial with the first positioning hole axis.

Optionally, a heat melting point is provided on the support, and the heat dissipation plate is thermally connected to the support through the heat melting point.

Optionally, two vertically symmetrical installation grooves are formed on the bracket.

Optionally, the bracket is an injection molded part, and/or, the bracket is provided with mounting holes for connecting with external parts.

Optionally, the battery unit includes a plurality of battery cells, tabs of the battery cells are pre-bent to be attached to each other, and connected to the adapter piece by laser welding.

The second aspect of the present invention provides a battery module, which includes the above-mentioned battery unit and a bus bar connected to the adapter piece.

The third aspect of the utility model provides a battery module, the battery module includes at least two battery units according to the above and bus bars connected to at least two of the adapter pieces, the bus bars are clamped to the In the buckle, the positioning pin of one of the two adjacent battery units is plugged into the positioning hole of the other.

Through the above technical solution, in the utility model, the battery frame is formed by setting brackets at both ends of the heat dissipation plate, the structure is simple and reliable, and meets the requirements of mass production and automation; In the groove, the assembly efficiency of the battery unit is improved. Multiple battery cells can be connected in series and parallel through the bus bar, without cutting out the position where the tabs pass through on the bus bar, the cross-section is large, and the thickness of the bus bar is greatly reduced, thereby reducing the weight of the module and production cost. Moreover, the production process of the battery unit is unified to meet the needs of various customers, and the difficulty of production line compatibility is reduced.

Description of drawings

Fig. 1 is the explosion schematic diagram of battery cell in the utility model;

Fig. 2 is a schematic diagram of the assembly process of the battery unit in the utility model;

Fig. 3 is the structural representation of support in Fig. 1 and Fig. 2;

Fig. 4 is a schematic structural view of the cooling plate in Fig. 1 and Fig. 2;

Fig. 5 is the schematic diagram after assembling of radiator plate and support in the utility model;

Fig. 6 is a schematic structural view of the battery module in the present invention.

Explanation of reference signs

1-radiating plate; 2-battery core; 3-bracket; 31-installation slot; 32-buckle; 33-first side wall; 34-first positioning pin; 35-first positioning hole; 37-second positioning Pin; 39-melting point; 40-installation hole 4-transfer piece; 5-bus.

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model. In the present utility model, unless otherwise stated, the used orientation words such as "up, down, left, right" usually refer to the orientation shown in the accompanying drawings, and "inside and outside" refer to Relative to the inside and outside of the contour of each part itself.

As shown in Figure 1 and Figure 2, the first aspect of the present invention provides a battery unit, the battery unit includes a heat sink 1 with a cavity, a cell 2 located in the cavity and connected to the heat sink 1 the bracket 3 at both ends, the bracket 3 is formed with a mounting groove 31, the tab of the battery cell 2 is connected with an adapter piece 4, and the adapter piece 4 is installed in the installation groove 31.

In the utility model, the battery frame shown in Fig. 5 is formed by setting brackets 3 at both ends of the cooling plate 1, the structure is simple and reliable, and meets the production requirements of mass production and automation; Installed in the installation groove 31 of the bracket 3, the assembly efficiency of the battery unit is improved. In addition, a plurality of battery cells can be connected in series and parallel through the following bus bar 5, without cutting out the position where the tabs pass through the bus bar 5, the flow cross section is large, and the thickness of the bus bar 5 is greatly reduced, thereby Reduce the weight and production cost of the module. Moreover, the production process of the battery unit is unified to meet the needs of various customers, and the difficulty of production line compatibility is reduced.

Further, as shown in FIG. 3 , buckles 32 are provided on the side of the bracket 3 facing away from the accommodating cavity, and/or, two ends of the bracket 3 along the stacking direction of the electric core 2 are provided with There are locating pins and/or locating holes. It can be understood that the support 3 is provided with two vertically symmetrical buckles 32 . In addition, the bracket 3 is upside down (the "upper and lower" refers to the orientation shown in Figure 3) and installed on both sides of the heat sink 1 upside down, and the buckle 32 is used to fix the bus bar 5 described below when laser welding The role of the bus bar 5, so as to realize the automatic welding of the production line. In addition, the bracket 3 is provided with two vertically symmetrical installation grooves 31 , and the adapter piece 4 can be plugged into the two installation grooves 31 at the same time, or only inserted into any one of the installation grooves 31 . The installation of the adapter piece 4 in the installation groove 31 can effectively solve the problems that the position of the adapter piece 4 is not fixed, and the tabs are torn during the vibration process.

Furthermore, the positioning pins and the positioning holes are respectively provided at the ends of the support 3 along the stacking direction of the battery cells 2 . Preferably, the bracket 3 includes a first side wall 33 and a second side wall located at both ends along the stacking direction of the electric core 2, and the first side wall 33 is provided with a first positioning pin 34 and a first Positioning hole 35, described second sidewall is provided with second positioning pin 37 and second positioning hole; Wherein, described first positioning pin 34 is coaxial with described second positioning hole, and described second positioning pin 37 It is coaxial with the first positioning hole 35 . Symmetrical positioning pins and positioning holes are provided on the bracket 3, which can meet the snap-fit installation between two power batteries, and can effectively prevent the middle part of the module from collapsing during the grouping of pouch batteries. In one embodiment of the present utility model, a through hole is formed on the positioning pin, and a screw can be inserted in the through hole and the positioning hole, so as to further increase the structural strength of the module and provide various fixing schemes for the module.

As an embodiment, the bracket 3 is provided with a heat melting point 39 , and the heat dissipation plate 1 is heat-fused connected to the bracket 3 through the heat melting point 39 . It can be understood that one or more thermal melting points 39 are respectively provided on the upper surface, the lower surface and the side wall of the bracket 3 . Moreover, as shown in FIG. 4 , a notch for avoiding the thermal melting point 39 is formed on the cooling plate 1 . By heating and melting the thermal melting point 39 at a high temperature, the bracket 3 is connected to both ends of the heat sink 1 to form a battery frame as shown in FIG. 5 . The battery frame can be integrated with structural components such as the adapter piece 4 of the battery cell 2, the bus bar 5, the low-voltage collection fixed point, and the outermost insulation protection fixed point.

In addition, the bracket 3 may be an injection molded part, and/or, the bracket 3 is provided with an installation hole 40 connected with an external part. Features on the bracket 3, such as mounting groove 31, positioning pin, positioning hole, buckle 32, hot melting point 39, mounting hole 40, etc., can be integrally formed on the bracket 3 during the manufacturing process of the bracket 3 by injection molding. ontology. Wherein, the positioning pin can also be installed in the reserved hole by pressing in after the injection molding part of the bracket 3 is manufactured. Buckles, plastic rivets, cable ties and other parts can be installed in the mounting hole 40 to further fix parts such as low-voltage collection and outer protective cover required by the module, which greatly reduces the type and quantity of module parts.

Further, the battery unit includes a plurality of battery cells 2 , tabs of the battery cells 2 are pre-bent to fit each other, and connected to the adapter sheet 4 by laser welding. In the embodiment shown in Fig. 1 and Fig. 2, three battery cells 2 are connected in parallel. In other embodiments, it may also be a single parallel, a double parallel, a quadruple parallel, and the like. Put the cell unit after welding the battery cell 2 and the adapter piece 4 into the battery frame as a whole, and install the adapter piece 4 in the installation groove 31 . When the cells 2 are connected in parallel, the tabs can be pre-bent or the aluminum-plastic film can be pre-bent to complete the bonding between the tabs of the cells 2. The adapter piece 4 can be flat or L-shaped.

The second aspect of the present invention provides a battery module, which includes the above-mentioned battery unit and a bus bar 5 connected to the adapter piece 4 .

As shown in Figure 6, the third aspect of the present invention provides a battery module, the battery module includes at least two of the above-mentioned battery cells and busbars 5 connected to at least two of the adapter pieces 4, so The bus bar 5 is clamped in the buckle 32 , and the positioning pin of one of the two adjacent battery units is plugged into the positioning hole of the other. Wherein, as shown in FIG. 6 , two adjacent battery cells have a left-right symmetrical structure. Further, in the present utility model, the battery cell 2 completes the welding of the cell tab and the bus bar 5 through the adapter piece 4, so that the battery tab and the bus bar 5 are respectively welded on the front and rear sides of the adapter piece 4, without Cuttings on the busbar 5 are required, so that the thickness of the busbar 5 can be greatly reduced. In addition, the adapter piece 4 can be a copper bar or an aluminum bar, and the bus bar 5 can also be a copper bar or an aluminum bar. It can be understood that when the bus bar 5 is connected to the same polarity adapter piece 4 of adjacent battery cells, a battery module in which the battery cells are connected in parallel is formed; the bus bar 5 is connected to the adjacent battery cells of different polarities. When the adapter piece 4 is used, a battery module in which the battery cells are connected in series is formed. Compared with the prior art, the battery module has the same advantages as the above-mentioned battery unit, which will not be repeated here.

The preferred implementation of the present utility model has been described in detail above in conjunction with the accompanying drawings, however, the present utility model is not limited thereto. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model, including the combination of each specific technical feature in any suitable manner. The combination method will not be explained separately. However, these simple modifications and combinations should also be regarded as the content disclosed by the utility model, and all belong to the protection scope of the utility model.

Claims (10)

1. A battery unit, characterized in that, the battery unit comprises a heat dissipation plate (1) having an accommodation chamber, a battery cell (2) located in the accommodation chamber, and two ends connected to the heat dissipation plate (1) A bracket (3), the bracket (3) is formed with a mounting groove (31), and an adapter piece (4) is connected to the tab of the battery core (2), and the adapter piece (4) is installed on Inside the installation groove (31). 2. The battery unit according to claim 1, characterized in that, a buckle (32) is provided on the side of the bracket (3) facing away from the accommodating cavity, and/or, the side of the bracket (3) Positioning pins and/or positioning holes are provided at both ends along the stacking direction of the electric core (2). 3. The battery unit according to claim 2, characterized in that, the positioning pins and the positioning holes are respectively provided at the ends of the support (3) along the stacking direction of the battery cells (2). 4. The battery unit according to claim 3, characterized in that, the bracket (3) comprises a first side wall (33) and a second side wall located at both ends along the stacking direction of the battery cells (2) , the first side wall (33) is provided with a first positioning pin (34) and a first positioning hole (35), and the second side wall is provided with a second positioning pin (37) and a second positioning hole ; Wherein, the first positioning pin (34) is coaxial with the second positioning hole, and the second positioning pin (37) is coaxial with the first positioning hole (35). 5. The battery unit according to claim 1, characterized in that, the support (3) is provided with a heat melting point (39), and the heat dissipation plate (1) is thermally connected to the heat sink through the heat melting point (39). The above bracket (3). 6. The battery unit according to claim 1, characterized in that two mounting grooves (31) which are vertically symmetrical are formed on the bracket (3). 7. The battery unit according to claim 1, characterized in that, the bracket (3) is an injection molded part, and/or, the bracket (3) is provided with mounting holes (40) for connecting with external parts. 8. The battery unit according to claim 1, characterized in that the battery unit comprises a plurality of battery cells (2), and tabs of a plurality of battery cells (2) are attached to each other by pre-bending and connected to the adapter piece (4) by laser welding. 9. A battery module, characterized in that the battery module comprises the battery unit according to any one of claims 1-8 and a bus bar (5) connected to the adapter piece (4) . 10. A battery module, characterized in that the battery module comprises at least two battery cells according to claim 2 and a bus bar (5) connected to at least two of the adapter pieces (4) , the bus bar (5) is clamped in the buckle (32), and the positioning pin of one of the two adjacent battery units is plugged into the positioning hole of the other .

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