Battery pack capable of superposing electric quantity and voltage

Abstract

The invention relates to the technical field of power batteries, in particular to a battery pack capable of superposing electric quantity and voltage, which comprises an upper layer module and a lower layer module, the upper-layer module comprises a first bracket and a plurality of upper battery cell groups arranged in the first bracket, and positive and negative electrodes of two adjacent upper battery cell groups are sequentially and reversely distributed; the upper module comprises a first support and a plurality of upper battery cell groups arranged in the first support, the lower module comprises a second support and a plurality of lower battery cell groups arranged in the second support, the upper module and the lower module can be electrically connected by adopting an up-and-down stacking mode, and the upper module, the middle module and the lower module can be further stacked; in this way, the electric quantity and the energy density of the battery pack can be improved, more comfortable use experience is provided for a user needing long endurance, in addition, laser can be directly used for welding the upper layer module, the middle layer module and the lower layer module, professional welding workers of the post are omitted, cost is saved, and the battery pack is more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a battery pack capable of superimposing electric quantity and voltage. Background Art

[0002] In current electric two-wheeled vehicle technology, due to limited box space, the battery module design can only accommodate one module, which limits the power and energy density of the battery pack, and has a negative impact on the user experience of those who need long battery life. For example, professional users such as food delivery riders have high requirements for the battery life of electric vehicles, but the existing design cannot meet their needs.

[0003] In addition, although some electric two-wheelers on the market use two battery modules, these modules are usually separated by insulating sheets. In order to achieve the series connection of the upper and lower modules, it must be completed through the soldering process. This process is not only complicated to operate, but also requires skilled workers to complete. Although lead-free solder is currently used, smoke and particulate matter are still generated during the welding process, which may cause harm to welders.

[0004] Therefore, the existing battery module design of electric two-wheeled vehicles has obvious deficiencies in space utilization, assembly efficiency and operator health, and a battery pack that can stack power and voltage is urgently needed to solve these problems. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned shortcomings in the prior art and to propose a battery pack that can superimpose power and voltage.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] Design a battery pack that can stack power and voltage, including:

[0008] An upper module and a lower module are stacked;

[0009] The upper module comprises a first bracket and a plurality of upper battery cell groups placed in the first bracket, wherein the positive and negative electrodes of two adjacent upper battery cell groups are distributed in opposite directions in sequence;

[0010] The lower module includes a second bracket and a plurality of lower cell groups placed in the second bracket. The positive and negative electrodes of two adjacent lower cell groups are distributed in reverse order and are stacked with the upper cell group to achieve circuit conduction.

[0011] Furthermore, the upper battery cell group is composed of a plurality of battery cells, and the upper ends of the plurality of battery cells are electrically connected through a first bus bar;

[0012] Wherein, a total positive electrode is formed at the initial end of the circuit of the plurality of upper cell groups, and a total negative electrode is formed at the end of the circuit of the plurality of upper cell groups.

[0013] Furthermore, the first busbar is in a ring structure and is used to connect two adjacent upper cell groups.

[0014] Furthermore, a second busbar is electrically connected to the bottom of the upper battery cell group and the top of the lower battery cell group. The two second busbars are in contact with each other and have an outward extension.

[0015] Furthermore, a third busbar is provided between the outer sides of the first bracket and the second bracket, and the third busbar is welded to two adjacent extension portions.

[0016] Furthermore, the lower battery cell group is composed of a plurality of battery cells, and the upper ends of the plurality of battery cells are electrically connected through a second bus bar;

[0017] There are a plurality of fourth busbars distributed transversely along the bottom of the lower battery cell group, and each fourth busbar is welded to the bottoms of two lower battery cell groups adjacent to each other in the longitudinal direction.

[0018] Furthermore, it also includes an intermediate module, which is electrically connected between the upper module and the lower module.

[0019] Furthermore, the intermediate module includes a third bracket and a plurality of medium battery cell groups placed in the third bracket, and the positive and negative poles of two adjacent medium battery cell groups are distributed in reverse order.

[0020] Furthermore, the middle battery cell group is composed of multiple battery cells, and the upper and lower ends of the multiple battery cells are electrically connected through a fifth bus. The fifth bus has the same structure as the second bus, and the fifth bus is also welded and electrically connected to the second bus through a third bus.

[0021] Furthermore, a screw is fixed on the upper module, and one end of the screw passes through the lower module and is fixed by a nut.

[0022] Furthermore, the first bracket, the second bracket and the third bracket each include two frames, and a receiving portion for placing the battery cell is formed between the two frames, wherein placement holes for positioning the battery cell are opened on the end faces of the frames, and positioning grooves for placing the bus are also provided on the end faces of the frames.

[0023] Furthermore, a positioning column is provided in the positioning groove;

[0024] The end surfaces of the first busbar, the second busbar and the third busbar are all provided with recessed parts for fitting with the frame, and the recessed parts are provided with through holes adapted to the positioning posts.

[0025] The present invention proposes a battery pack capable of stacking power and voltage, which has the beneficial effect that: in the present invention, by adopting an up and down stacking method, an electrical connection between an upper module and a lower module can be achieved, and a further stacking method of an upper module, a middle module and a lower module can be achieved, thereby increasing the power and energy density of the battery pack and providing a more comfortable use experience for users who require long battery life. In addition, in the present invention, laser welding of the upper, middle and lower modules can be directly used, eliminating the need for professional welding workers in this position, saving costs, and being more environmentally friendly. As long as there is enough space in the box, multiple modules can be stacked to achieve the effect of increasing power and voltage to meet the long battery life requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the upper module and the lower module of the present invention;

[0027] Figure 2 It is a schematic diagram of the stacking structure of the upper module and the lower module of the present invention;

[0028] Figure 3 This is a schematic diagram of the top structure of the intermediate module of the present invention;

[0029] Figure 4 is a schematic diagram of the fifth bus structure of the present invention;

[0030] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of area A;

[0031] Figure 6 This is a schematic diagram of the bottom structure of the middle module of the present invention;

[0032] Figure 7 It is a schematic diagram of the circuit conduction structure of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the upper module of the present invention;

[0034] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of area B;

[0035] Fig.10 It is a schematic structural diagram of the third busbar of the present invention.

[0036] In the figure: 1. upper module; 11. first bracket; 111. frame; 112. placement hole; 113. positioning groove; 114. positioning column; 12. upper cell group; 13. first bus; 131. total positive electrode; 132. total negative electrode; 133. recessed portion; 14. second bus; 141. extension portion; 15. third bus; 2. lower module; 21. second bracket; 22. lower cell group; 23. fourth bus; 3. middle module; 31. third bracket; 32. middle cell group; 33. fifth bus; 4. screw. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] Reference Figure 1-7 An embodiment of the present invention discloses a battery pack capable of superimposing power and voltage. In this embodiment, an electric two-wheeled vehicle is taken as an example. The battery pack is applied to the electric two-wheeled vehicle for power supply. Specifically, the battery pack includes:

[0039] An upper module 1 and a lower module 2 are stacked;

[0040] The upper module 1 comprises a first bracket 11 and a plurality of upper battery core groups 12 placed in the first bracket 11, wherein the positive and negative electrodes of two adjacent upper battery core groups 12 are arranged in opposite directions in sequence;

[0041] The lower module 2 includes a second bracket 21 and a plurality of lower cell groups 22 placed in the second bracket 21 . The positive and negative electrodes of two adjacent lower cell groups 22 are reversely distributed in sequence and are stacked with the upper cell group 12 to realize circuit conduction.

[0042] In some embodiments, the upper cell group 12 of the present invention is composed of a plurality of cells, and the upper ends of the plurality of cells are electrically connected through a first bus 13. Preferably, in this embodiment, each upper cell group 12 is composed of three cells. Of course, in other embodiments, technicians in the relevant field can select the specific number of cells according to actual needs, and there is no limitation here.

[0043] In more detail, in this embodiment, the positive or negative electrodes of the three battery cells in the same upper battery cell group 12 are arranged in the same direction. Since the positive and negative electrodes of the two adjacent upper battery cell groups 12 are distributed in opposite directions in sequence, the positive and negative electrodes of the two adjacent upper battery cell groups 12 are connected via the first bus 13 to achieve sequential connection of the positive and negative electrodes. Secondly, the positive and negative electrodes corresponding to the stacked upper battery cell group 12 and the lower battery cell group 22 are opposite. For example, when the positive electrode of the upper battery cell group 12 is facing downward, the negative electrode of the corresponding lower battery cell group 22 should be facing upward and connected to it accordingly, so as to achieve the positive and negative electrode connection between the upper and lower battery cell groups.

[0044] Among them, a total positive electrode 131 is formed at the initial end of the circuit of the multiple upper battery cell groups 12, and a total negative electrode 132 is formed at the end of the circuit of the multiple upper battery cell groups 12. That is to say, in the present invention, the positive and negative electrodes of the battery pack are moved to the upper module by changing the arrangement between the battery cells, which facilitates operation, reduces costs, and makes the product appearance more beautiful.

[0045] Furthermore, in the embodiment of the present invention, the first busbar 13 is in a ring structure, which is used to electrically connect the two adjacent upper battery cell groups 12. Furthermore, in this embodiment, an extension portion 141 is also provided on the first busbar 13, which is bent on the outside of the first bracket 11.

[0046] In addition, based on the above embodiments, in the present invention, the cells at the bottom of the upper cell group 12 and the top of the lower cell group 22 are connected with a second bus 14, the two second bus bars 14 are in contact with each other, and have an extension portion 141 extending outwardly, and the circuit conduction of the upper module 1 and the lower module 2 can be achieved through the two second bus bars 14, and the extension portion 141 is provided to achieve convenient connection to ensure the stability of electrical conduction.

[0047] Specifically, in the embodiment of the present invention, a third bus 15 is arranged between the outer sides of the first bracket 11 and the second bracket 21, and the third bus 15 is welded to two adjacent extension portions 141, where the adjacent means upper and lower adjacent, that is, the third bus 15 is used to connect the extension portions 141 on the two second bus bars 14, which can further ensure the stability of electrical conduction. At the same time, the external third bus 15 is also convenient for welding operations, thereby improving the convenience of assembly.

[0048] In some embodiments, similarly, the lower cell group 22 of the present invention is composed of a plurality of cells, and the upper ends of the plurality of cells are electrically connected through the second bus 14. In this embodiment, each lower cell group 22 is composed of three cells. Of course, in other embodiments, technicians in the relevant field can select the specific number of cells according to actual needs, and there is no limitation here.

[0049] A plurality of fourth busbars 23 are distributed transversely along the bottom of the lower cell group 22 , and each fourth busbar 23 is welded to the bottoms of two lower cell groups 22 adjacent to each other in the longitudinal direction.

[0050] In order to further enhance the power and voltage, the present invention also includes an intermediate module 3, and the intermediate module 3 is electrically connected between the upper module 1 and the lower module 2. Specifically, the intermediate module 3 described in the present invention is not limited to one. Those skilled in the art know that multiple intermediate modules 3 can be stacked in sequence to achieve a stable increase in power and voltage. As long as there is enough space, multiple modules can be stacked to achieve the effect of increasing power and voltage.

[0051] Specifically, in the embodiment of the present invention, the intermediate module 3 includes a third bracket 31 and a plurality of medium cell groups 32 placed in the third bracket 31 , and the positive and negative poles of two adjacent medium cell groups 32 are distributed in reverse order.

[0052] In addition, with respect to the connection method of the middle battery cell group 32, in the embodiment of the present invention, the middle battery cell group 32 is composed of a plurality of battery cells, and the upper ends and lower ends of the plurality of battery cells are electrically connected through a fifth bus 33. The fifth bus 33 has the same structure as the second bus 14, and the fifth bus 33 and the second bus 14 are also welded and electrically connected through a third bus 15, that is, the intermediate module 3 in the present invention is equivalent to the copper busbar to realize the conduction series connection of the upper module 1 and the lower module 2.

[0053] In addition, in order to achieve the connection stability between the upper module 1 and the lower module 2, a screw 4 is fixed on the upper module 1 in the present invention, and one end of the screw 4 passes through the lower module 2 and is fixed by a nut. Of course, when an intermediate module 3 is set, the screw 4 can also pass through the intermediate module 3 to achieve mutual connection and fixation between the modules.

[0054] Reference Figure 8-10 In some embodiments, the first bracket 11, the second bracket 21 and the third bracket 31 of the present invention each include two frames 111, and a receiving portion for placing the battery cell is formed between the two frames 111, wherein a placement hole 112 for positioning the battery cell is opened on the end face of the frame 111, and the placement hole 112 is set through so that the extreme end of the battery cell can pass through the placement hole 112 to facilitate connection with the bus, and a positioning groove 113 for placing the bus is also set on the end face of the frame 111. The design of the positioning groove 113 can realize the convenient placement of the bus, and improve the convenience and accuracy of assembly positioning.

[0055] In addition, based on the above embodiment, a positioning column 114 is provided in the positioning groove 113 in the present invention;

[0056] The end surfaces of the first busbar 13 , the second busbar 14 and the third busbar 15 are all provided with recessed portions 133 for fitting with the frame 111 , and the recessed portions 133 are provided with through holes adapted to the positioning posts 114 .

[0057] Specifically, the planar portion of each busbar in the present invention is used to contact the battery cell to achieve electrical connection. The design of the recessed portion 133 can realize the connection positioning of the frame 111, that is, when the recessed portion 133 is placed in the positioning groove 113, the design of the through hole and the positioning column 114 can be used to optimize the convenience of assembly positioning. In addition, due to the design of the recessed portion 133, a gap will be formed between the upper and lower buses.

[0058] In summary, the present invention can achieve electrical connection between the upper module 1 and the lower module 2 by adopting the upper and lower stacking method, and can also achieve further stacking of the upper module 1, the middle module 3 and the lower module 2, which can increase the battery pack power and energy density, and provide a more comfortable user experience for users who need long battery life. In addition, the present invention can directly use laser welding to weld the upper, middle and lower modules, eliminating the need for professional welding workers in this position, saving costs, and being more environmentally friendly. As long as there is enough space in the box, multiple modules can be stacked to achieve the effect of increasing power and voltage to meet the long battery life requirements.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery pack capable of superimposing electric quantity and voltage, characterized in that: include: An upper module (1) and a lower module (2) are stacked; The upper module (1) comprises a first bracket (11) and a plurality of upper cell groups (12) placed in the first bracket (11), wherein the positive and negative electrodes of two adjacent upper cell groups (12) are arranged in opposite directions in sequence; The lower layer module (2) comprises a second support (21) and a plurality of lower cell groups (22) disposed in the second support (21); the positive and negative electrodes of two adjacent lower cell groups (22) are sequentially distributed in opposite directions, and are stacked with the upper cell group (12) to achieve circuit conduction.

2. A battery pack capable of superimposing electric quantity and voltage according to claim 1, characterized in that: The upper battery cell group (12) is composed of a plurality of battery cells, and the upper ends of the plurality of battery cells are electrically connected via a first bus bar (13); A total positive electrode (131) is formed at the initial end of the circuit of the plurality of upper cell groups (12), and a total negative electrode (132) is formed at the end of the circuit of the plurality of upper cell groups (12).

3. A battery pack capable of superimposing electric quantity and voltage according to claim 2, characterized in that: The first busbar (13) is in a ring structure and is used to electrically connect two adjacent upper battery cell groups (12).

4. A battery pack capable of superimposing electric quantity and voltage according to claim 2, characterized in that: The cells at the bottom of the upper cell group (12) and the top of the lower cell group (22) are connected to a second busbar (14), and the two second busbars (14) are in contact with each other and have an outwardly extending portion (141).

5. A battery pack capable of superimposing electric quantity and voltage according to claim 4, characterized in that: A third busbar (15) is provided between the outer sides of the first bracket (11) and the second bracket (21), and the third busbar (15) is welded to two adjacent extension portions (141).

6. A battery pack capable of superimposing electric quantity and voltage according to claim 1, characterized in that: The lower battery cell group (22) is composed of a plurality of battery cells, and the upper ends of the plurality of battery cells are electrically connected via a second bus bar (14); A plurality of fourth busbars (23) are distributed transversely along the bottom of the lower battery cell group (22), and each fourth busbar (23) is welded to the bottoms of two longitudinally adjacent lower battery cell groups (22).

7. A battery pack capable of superimposing electric quantity and voltage according to claim 5, characterized in that: It also comprises an intermediate module (3), wherein the intermediate module (3) is electrically connected between the upper module (1) and the lower module (2).

8. A battery pack capable of superimposing electric quantity and voltage according to claim 7, characterized in that: The intermediate module (3) comprises a third bracket (31) and a plurality of medium cell groups (32) disposed in the third bracket (31), wherein the positive and negative electrodes of two adjacent medium cell groups (32) are distributed in reverse order.

9. A battery pack capable of superimposing electric quantity and voltage according to claim 8, characterized in that: The middle battery cell group (32) is composed of a plurality of battery cells, the upper ends and lower ends of the plurality of battery cells are electrically connected via a fifth bus bar (33), the fifth bus bar (33) has the same structure as the second bus bar (14), and the fifth bus bar (33) and the second bus bar (14) are also welded and electrically connected via a third bus bar (15).

10. A battery pack capable of superimposing electric quantity and voltage according to claim 1, characterized in that: A screw rod (4) is fixed on the upper module (1), and one end of the screw rod (4) passes through the lower module (2) and is fixed by a nut.

11. A battery pack capable of superimposing electric quantity and voltage according to claim 7, characterized in that: The first bracket (11), the second bracket (21) and the third bracket (31) each comprise two frames (111), wherein a receiving portion for placing a battery cell is formed between the two frames (111), wherein a placement hole (112) for positioning the battery cell is provided on the end surface of the frame (111), and a positioning groove (113) for placing a busbar is also provided on the end surface of the frame (111).

12. A battery pack capable of superimposing electric quantity and voltage according to claim 11, characterized in that: A positioning column (114) is arranged in the positioning groove (113); The end surfaces of the first busbar (13), the second busbar (14) and the third busbar (15) are all provided with recessed portions (133) for fitting with the frame (111), and the recessed portions (133) are provided with through holes adapted to fit with the positioning posts (114).

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