A new power battery module

Abstract

The application discloses a novel power battery module, which comprises a plurality of battery cells, a first plastic insulating sheet is arranged between two adjacent battery cells, first and second metal end plates are arranged at both ends of the battery cell, a second plastic insulating sheet is arranged on the front and back surfaces of the battery cell, a fourth plastic insulating sheet is connected to the bottom surface of the battery cell, a third plastic insulating sheet is arranged on the top of the battery cell, a plastic pull belt is fixed between the first and second metal end plates, the electrodes of adjacent battery cells are connected in series through series-connected aluminum bars, the first and second metal end plates are connected with first and second power connection aluminum bars, insulating columns are arranged on the first and second metal end plates, and heat absorption plates are symmetrically arranged at both ends of the top of the plurality of battery cells arranged in parallel; through the above structure, the battery cell expansion during charging and discharging can be avoided to prevent the aluminum bars from being damaged, and the aluminum bars at the power connection position of the module can be prevented from being damaged due to stress.

Description

Technical Field

[0001] This invention relates to the field of battery module technology, and specifically to a novel power battery module. Background Technology

[0002] In recent years, due to increasingly severe environmental problems and the escalating global energy crisis, oil resources are facing depletion. Lithium-ion batteries, with their significant environmental and recyclable advantages, have gained popularity. Currently, new energy vehicles use lithium-ion batteries as their primary power source, and electric vehicles are continuously developing lithium-ion batteries that are lighter, smaller, and have higher output voltage and power density. An automotive power battery pack is first assembled from individual lithium batteries connected in series and parallel using aluminum busbars to form a module. Then, the modules are placed in a battery box, and copper busbars electrically connect the modules. Finally, a battery management system, relays, high-voltage boxes, and other components are added to form a battery pack.

[0003] Due to market demand, electric vehicles need to develop towards higher driving ranges. This requires the continuous development of lithium-ion batteries that are lighter, smaller, and have higher output voltage and power density. On the other hand, the requirements for lightweight and low-cost power battery systems are constantly increasing. As an intermediate link in this process, the power battery module must first ensure mechanical strength and electrical safety, and on this basis, make the power battery module structure as lightweight, reliable, low-cost, and efficient as possible.

[0004] Currently, existing power battery modules in the industry typically consist of several batteries first stacked together using structural adhesive, then fixed to the module by welding metal end plates at both ends and metal side plates on both sides to form a metal frame, or by binding them together with steel straps. The battery cell terminals are connected in series and parallel by welding to straight aluminum busbars, and the aluminum busbars at the connection points should not have holes or welded screws. During charging and discharging, the battery cells expand, and the straight aluminum busbars may break. The aluminum busbars used are usually soft and deform under stress.

[0005] Therefore, there is a strong market demand for a new type of power battery module to overcome the aforementioned shortcomings. Summary of the Invention

[0006] To overcome the aforementioned technical problems, the present invention aims to provide a novel power battery module, which is equipped with a series aluminum busbar with a bend, a first power connection aluminum busbar, and a second power connection aluminum busbar, to prevent the aluminum busbar from being damaged due to expansion during charging and discharging of the battery cell. Furthermore, the bend is positioned downwards during installation, further saving space above the battery module and improving energy density.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A novel power battery module includes multiple battery cells arranged side-by-side, with a first plastic insulating sheet between adjacent cells. Each battery cell has a first metal end plate at one end and a second metal end plate at the other. Second plastic insulating sheets are provided on both the front and back of each battery cell. A fourth plastic insulating sheet is connected to the bottom of each battery cell. A third plastic insulating sheet is provided on the top of each battery cell. A plastic strap is fixed between the first and second metal end plates. Electrodes of adjacent cells are connected in series using aluminum busbars, with one electrode connected to a first power connection aluminum busbar and the other electrode connected to a second power connection aluminum busbar. A fixing platform is provided on both the first and second metal end plates, and an insulating column is mounted on the fixing platform, connecting to the corresponding first and second power connection aluminum busbars. Heat-absorbing plates are symmetrically arranged at both ends of the top of the multiple battery cells, and the series aluminum busbars, the first power connection aluminum busbars, and the second power connection aluminum busbars are all connected to the heat-absorbing plates.

[0009] As a further aspect of the present invention: both ends of the outer surfaces of the first metal end plate and the second metal end plate are symmetrically provided with fixing grooves to facilitate the engagement of the plastic pull strap.

[0010] As a further aspect of the present invention: both the first metal end plate and the second metal end plate are integrally stamped.

[0011] As a further embodiment of the present invention: the series aluminum busbar, the first power connection aluminum busbar, and the second power connection aluminum busbar are all provided with a bent portion in the middle and a horizontal portion at both ends, and the connection between the bent portion and the horizontal portion is rounded.

[0012] As a further aspect of the present invention: the bent portions of the series aluminum busbar, the first power connection aluminum busbar, and the second power connection aluminum busbar are all arranged facing downwards.

[0013] As a further embodiment of the present invention: a first power connection aluminum busbar has a connection hole 1 on the horizontal part of one end and a heat dissipation protrusion 1 on the side of the horizontal part of the other end; a second power connection aluminum busbar has a connection hole 2 on the horizontal part of one end and a heat dissipation protrusion 2 on the side of the horizontal part of the other end; and heat dissipation protrusion 3 is provided on the side of the horizontal part of both connected aluminum busbars.

[0014] As a further aspect of the present invention: a plurality of heat absorption grooves are provided on one side of the heat absorption plate, and heat dissipation boss one, heat dissipation boss two and heat dissipation boss three are inserted into the corresponding heat absorption grooves.

[0015] As a further aspect of the present invention, the heat-absorbing plate is a silicone plate.

[0016] The beneficial effects of this invention are:

[0017] 1. The module of the present invention adopts a series aluminum busbar with a bending part, a first power connection aluminum busbar and a second power connection aluminum busbar to prevent the aluminum busbar from being damaged due to expansion during charging and discharging of the battery cell. Furthermore, the bending part is set downwards during installation, which further saves the space above the battery module and improves the energy density.

[0018] 2. This invention uses insulating pillars and fixed platforms to share the force, thus preventing excessive force from damaging the first and second power connection aluminum busbars during module power connection.

[0019] 3. The present invention adopts an integrated stamping process for the first and second metal end plates, which saves space, reduces weight, and has a simple structure, small size, and multiple functions. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall exploded structure of the present invention;

[0023] Figure 3 yes Figure 1 Enlarged structural diagram of region A in the middle;

[0024] Figure 4 This is a schematic diagram of the first metal end plate structure in this invention;

[0025] Figure 5 This is a schematic diagram of the series aluminum busbar structure in this invention;

[0026] Figure 6 This is a schematic diagram of the first power connection aluminum busbar structure in this invention;

[0027] Figure 7 This is a schematic diagram of the second power connection aluminum busbar structure in this invention;

[0028] Figure 8 This is a schematic diagram of the heat-absorbing plate structure in this invention.

[0029] In the figure: 1. First metal end plate; 2. Insulating column; 3. Battery cell; 4. First power connection aluminum busbar; 5. Series aluminum busbar; 6. First plastic insulating sheet; 7. Second plastic insulating sheet; 8. Plastic pull strip; 9. Third plastic insulating sheet; 10. Fourth plastic insulating sheet; 11. Heat absorption plate; 111. Heat absorption groove; 12. Second power connection aluminum busbar; 13. Second metal end plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1-8 As shown, this is a novel power battery module. The module includes multiple battery cells 3 arranged horizontally side-by-side. A first plastic insulating sheet 6 is provided between adjacent battery cells 3 to isolate them and prevent mutual interference. Each battery cell 3 has a first metal end plate 1 at one end and a second metal end plate 13 at the other end. The first plastic insulating sheet 6 is also provided between the first and second metal end plates 1 and the battery cells 3 to isolate them from each other. The effect of end plate 1 and second metal end plate 13 on battery cell 3 is that a second plastic insulating sheet 7 is provided on one side of the front of the multiple battery cells 3 arranged in parallel, and a second plastic insulating sheet 7 is also provided on one side of the back of the multiple battery cells 3 arranged in parallel. Furthermore, a fourth plastic insulating sheet 10 is connected to the bottom surface of the multiple battery cells 3 arranged in parallel. The multiple battery cells 3 are separated by insulation through the first plastic insulating sheet 6, the second plastic insulating sheet 7 and the fourth plastic insulating sheet 10, which further improves the safety performance of the battery module.

[0032] Furthermore, the first metal end plate 1 and the second metal end plate 13 are fixed together by plastic pull straps 8, which saves weight and facilitates fixing. The first metal end plate 1 and the second metal end plate 13 have symmetrical fixing grooves on both ends of their outer sides, and the positions of multiple fixing grooves are corresponding to facilitate the engagement of the plastic pull straps 8. At the same time, a fixing platform is provided at one end of the first metal end plate 1 and a fixing platform is also provided at one end of the second metal end plate 13. The two fixing platforms are symmetrically distributed about the longitudinal center line of the module for installing the insulating pillars 2. The first metal end plate 1 and the second metal end plate 13 are both integrally stamped.

[0033] Further such as Figures 1-3 As shown, the electrodes of adjacent cells 3 are connected in series by aluminum busbars 5, and a first power connection aluminum busbar 4 is connected to the positive or negative terminal of cell 3 at one end of the module, and a second power connection aluminum busbar 12 is connected to the negative or positive terminal at the other end. Through the first power connection aluminum busbar 4, the series aluminum busbar 5 and the second power connection aluminum busbar 12, multiple parallel cells 3 form a complete circuit.

[0034] Further such as Figure 1 and Figure 3As shown, insulating columns 2 are fixedly installed on the fixing platforms of the first metal end plate 1 and the second metal end plate 13. The insulating column 2 located below the first power connection aluminum busbar 4 is fixedly connected to the first power connection aluminum busbar 4, and the insulating column 2 located below the second metal end plate 13 is fixedly connected to the second metal end plate 13. By setting the insulating column 2 and the fixing platform to share the force, the first power connection aluminum busbar 4 and the second power connection aluminum busbar 12 are prevented from being damaged by excessive force when the module is powered.

[0035] Further such as Figures 5-7 As shown, the series aluminum busbar 5, the first power connection aluminum busbar 4, and the second power connection aluminum busbar 12 all have a bent part in the middle and a horizontal part at both ends. The connection between the bent part and the horizontal part is rounded to avoid stress concentration. The bent parts of the series aluminum busbar 5, the first power connection aluminum busbar 4, and the second power connection aluminum busbar 12 are all set downwards. During the connection with the electrode of the battery cell 3, the bent part is also oriented towards the battery cell 3 to further save the space above the battery module and improve the energy density. The series aluminum busbar 5, the first power connection aluminum busbar 4, and the second power connection aluminum busbar 12 are all provided with bent parts, so that there is an arc between adjacent battery cells 3, to prevent the expansion of the battery cell 3 during charging and discharging and damage to the corresponding aluminum busbar.

[0036] Furthermore, the first power connection aluminum busbar 4 has a connection hole 1 on one horizontal part and a heat dissipation protrusion 1 on the side of the other horizontal part. The second power connection aluminum busbar 12 has a connection hole 2 on one horizontal part and a heat dissipation protrusion 2 on the side of the other horizontal part. When the first power connection aluminum busbar 4 and the second power connection aluminum busbar 12 are arranged horizontally, the heat dissipation protrusion 1 and the heat dissipation protrusion 2 are located on the same side. The two horizontal parts of the series aluminum busbar 5 are provided with heat dissipation protrusion 3, which are located on the same side and are also on the same side as the heat dissipation protrusion 1 and the heat dissipation protrusion 2. Furthermore, the connection hole 1 and the connection hole 2 are aligned with the screw holes on the corresponding insulating post 2 and are fixed by screws.

[0037] Further, such as Figure 1 , Figure 2 and Figure 8 As shown, heat-absorbing plates 11 are provided on both sides of the top of the module. Both heat-absorbing plates 11 are located at the outer ends of the series aluminum busbars 5. Multiple heat-absorbing grooves 111 are opened on one side of the heat-absorbing plate 11. Heat dissipation boss one, heat dissipation boss two and heat dissipation boss three are inserted into the corresponding heat-absorbing grooves 111. The heat-absorbing plate 11 is a silicone plate, which is used to further diffuse the heat generated by the first power connection aluminum busbar 4, the series aluminum busbar 5 and the second power connection aluminum busbar 12 during the use of the module, so as to avoid the battery from getting too hot.

[0038] Furthermore, a third plastic insulating sheet 9 is installed on the top of multiple parallel arranged battery cells 3, which, together with the first plastic insulating sheet 6, the second plastic insulating sheet 7 and the fourth plastic insulating sheet 10, achieves four-sided insulation of the module, further reducing the impact of the external environment.

[0039] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A novel power battery module, characterized in that, It includes multiple battery cells (3), which are arranged side by side, and a first plastic insulating sheet (6) is provided between two adjacent battery cells (3). One end of the multiple battery cells (3) arranged side by side is provided with a first metal end plate (1), and the other end is provided with a second metal end plate (13). The front and back sides of the multiple battery cells (3) arranged side by side are provided with a second plastic insulating sheet (7). The bottom surface of the multiple battery cells (3) arranged side by side is connected with a fourth plastic insulating sheet (10). The top of the multiple battery cells (3) arranged side by side is provided with a third plastic insulating sheet (9). A plastic pull strip (8) is fixed between the first metal end plate (1) and the second metal end plate (13). The electrodes of adjacent cells (3) are connected in series by aluminum busbars (5), and one end of the electrode is connected to the first power connection aluminum busbar (4), and the other end of the electrode is connected to the second power connection aluminum busbar (12). The first metal end plate (1) and the second metal end plate (13) are both provided with a fixed platform, and an insulating column (2) is installed on the fixed platform. The insulating column (2) is connected to the corresponding first power connection aluminum busbar (4) and second power connection aluminum busbar (12). The top ends of the multiple cells (3) arranged in parallel are symmetrically provided with heat absorption plates (11). The aluminum busbar (5), the first power connection aluminum busbar (4) and the second power connection aluminum busbar (12) are all connected to the heat absorption plate (11). The first power connection aluminum busbar (4) has a connection hole 1 on the horizontal part of one end and a heat dissipation boss 1 on the side of the horizontal part of the other end. The second power connection aluminum busbar (12) has a connection hole 2 on the horizontal part of one end and a heat dissipation boss 2 on the side of the horizontal part of the other end. The two horizontal parts of the series aluminum busbar (5) are each provided with a heat dissipation boss 3. Multiple heat absorption grooves (111) are provided on one side of the heat absorption plate (11), and heat dissipation boss one, heat dissipation boss two and heat dissipation boss three are inserted into the corresponding heat absorption grooves (111).

2. The novel power battery module according to claim 1, characterized in that, Both the outer sides of the first metal end plate (1) and the second metal end plate (13) are symmetrically provided with fixing grooves to facilitate the engagement of the plastic pull strap (8).

3. The novel power battery module according to claim 1, characterized in that, The first metal end plate (1) and the second metal end plate (13) are both integrally stamped.

4. A novel power battery module according to claim 1, characterized in that, The series aluminum busbar (5), the first power connection aluminum busbar (4) and the second power connection aluminum busbar (12) are all provided with a bent part in the middle and a horizontal part at both ends, and the connection between the bent part and the horizontal part is rounded.

5. A novel power battery module according to claim 4, characterized in that, The bent portions of the series aluminum busbar (5), the first power connection aluminum busbar (4), and the second power connection aluminum busbar (12) are all set downwards.

6. A novel power battery module according to claim 1, characterized in that, The heat absorption plate (11) is a silicone plate.

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