Battery system

Abstract

The utility model discloses a battery system. A battery cell stacking body is provided with a total positive tab and a total negative tab; the total positive tab and the total negative tab are respectively lapped with the BMS board; the other tabs on the battery cell stacking body are mutually lapped on the busbar; and the BMS board is electrically connected with the busbar or other tabs. The tabs of the different cells of the cell stack are lapped by the busbar, the total positive tab and the total negative tab as the input end and the output end are respectively connected with the BMS board, and then the BMS board is electrically connected with the busbar or other tabs to realize a complete acquisition loop, so that parts such as a sampling wire harness and a BMS bracket are omitted, and the cost is reduced. The technological process is simplified, and the material and labor cost is reduced; compared with the prior art, the sampling wire harness does not need to be installed on the busbar through ultrasonic welding and then connected with the BMS to form the integrated circuit, the installation mode of the integrated circuit is optimized, working hours are saved, and working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery system. Background Art

[0002] The current installation method of integrated circuits in battery systems is to assemble the sampling harness, bracket, and bus into a sampling bus assembly, which is then installed on the battery cell stack by laser welding. The bus is connected in the middle of the sampling harness to collect signals at the BMS acquisition port.

[0003] However, this installation method not only has low space utilization within the module, but also has a complex process and relatively high cost. For example, the sampling harness in the sampling bus assembly needs to be ultrasonically welded to the bus piece by piece, which is time-consuming and cumbersome to process, and also results in a waste of manpower. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery system, aiming to solve the technical problem that the existing bus collects signals through the sampling harness and then collects them on the BMS acquisition port, which is time-consuming and labor-intensive.

[0005] In order to achieve the above-mentioned object, the utility model provides a battery system, including a battery cell stack, a bus bar, and a BMS board;

[0006] The battery cell stack is provided with a total positive electrode lug and a total negative electrode lug;

[0007] The total positive electrode tab and the total negative electrode tab are respectively overlapped with the BMS board;

[0008] The other tabs on the battery cell stack are overlapped on the busbar;

[0009] The BMS board is electrically connected to the busbar or other tabs.

[0010] Furthermore, the battery cell stack includes a plurality of battery cells each having a bipolar tab on one side, and the BMS board cover is disposed on the busbar.

[0011] Furthermore, the battery cell stack includes a plurality of battery cells with pole tabs on two opposite sides, and the two BMS boards are respectively covered on the busbars.

[0012] Furthermore, it also includes a connecting piece, and the BMS board is electrically connected to the busbar or other tabs through the connecting piece.

[0013] Furthermore, the busbar is provided with a through hole, the BMS board is provided with a connecting hole corresponding to the busbar, the connecting member is a bolt or a screw, and the bolt or the screw passes through the connecting hole and is fixedly connected to the through hole.

[0014] Furthermore, the connecting piece is a nickel sheet, and the other tabs are welded to the BMS board through the nickel sheet.

[0015] Furthermore, it also includes a bracket, which is arranged at the pole ear end of the battery cell stack, and the bracket is provided with an opening for assembling the bus, and the other pole ears are overlapped on the bus through the opening; the total positive pole ear and the total negative pole ear extend out of the opening respectively and overlap the BMS board.

[0016] Furthermore, the bracket is made of plastic.

[0017] Furthermore, it also includes a strap, a part of which is welded to the pad on the BMS board, and another part of which is welded to the total positive electrode tab or the total negative electrode tab.

[0018] Furthermore, the overlapping piece is L-shaped, straight-shaped or U-shaped.

[0019] Beneficial effects:

[0020] The utility model discloses a battery system, comprising a battery cell stack, a bus bar and a BMS board; the battery cell stack is provided with a total positive electrode ear and a total negative electrode ear; the total positive electrode ear and the total negative electrode ear are overlapped with the BMS board respectively; other electrode ears on the battery cell stack are overlapped with each other on the bus bar; the BMS board is electrically connected to the bus bar or other electrode ears. The battery system of the present application overlaps the tabs of different cells in the cell stack with a bus, connects the total positive tab and the total negative tab as the input and output ends to the BMS board respectively, and then electrically connects the BMS board to the bus or other tabs to realize a complete data collection circuit. This method eliminates parts such as the sampling harness and BMS bracket, simplifies the process flow, and reduces material and labor costs; improves the difficulties in structural design and low space utilization caused by limited space; compared with the prior art, there is no need to first install the sampling harness on the bus by ultrasonic welding, and then connect the sampling harness to the BMS board to form an integrated circuit, which optimizes the installation method of the integrated circuit, saves working hours, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of an explosion structure in one embodiment of the utility model;

[0022] Figure 2 A method for installing an integrated circuit in a battery system provided in the prior art;

[0023] Figure 3 A top view of an embodiment of the utility model;

[0024] Figure 4 A side view of an embodiment of the utility model;

[0025] Figure 5 for Figure 3 Sectional view at AA;

[0026] Figure 6 for Figure 5 A partial enlarged view of point B;

[0027] Figure 7 It is a schematic structural diagram of overlapping pieces of different shapes in one embodiment of the utility model.

[0028] in:

[0029] 1. Battery cell stack; 11. Battery cell; 101. Total positive electrode ear; 102. Total negative electrode ear; 103. Pole ear; 2. BMS board; 201. Solder pad; 3. Busbar; 4. Connector; 5. Lap; 6. Bracket; 7. BMS bracket; 8. Copper busbar; 9. Sampling harness.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model 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 a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] Reference Figure 1 , Figure 3-6 An embodiment of the utility model provides a battery system, including a battery cell stack 1, a bus 3, and a BMS board 2; the battery cell stack 1 is provided with a total positive electrode ear 101 and a total negative electrode ear 102; the total positive electrode ear 101 and the total negative electrode ear 102 are overlapped with the BMS board 2 respectively; other electrode ears 103 on the battery cell stack 1 are overlapped with each other on the bus 3; the BMS board 2 is electrically connected to the bus 3 or other electrode ears 103.

[0036] In the above embodiment, the total positive electrode ear 101 and the total negative electrode ear 102 are the first group of electrode ears and the last group of electrode ears on the battery cell stack 1, and the other electrode ears refer to the middle electrode ears 103 connected in series. The battery cell stack 1 includes multiple battery cells 11, and the electrode ears 103 between the battery cells 11 are overlapped on the bus 3 to realize series or parallel connection. The total positive electrode ear 101 and the total negative electrode ear 102 and the bus 3 are respectively connected to the BMS board 2, and the BMS board 2 collects signals from the bus 3 and the total positive electrode ear 101 and the total negative electrode ear 102 respectively. The battery system of the present application connects the tabs 103 of different cells 11 of the cell stack 1 with a bus 3, and the total positive tab 101 and the total negative tab 102 as the input and output ends are respectively connected to the BMS board 2, and then the BMS board 2 is electrically connected to the bus 3 or other tabs 103 to realize a complete data collection circuit. This method eliminates parts such as the sampling harness 9 and the BMS bracket 6, reduces material and labor costs, improves the difficulties in structural design and low space utilization due to limited space, and is compared with the prior art. Figure 2 It is not necessary to first install the sampling harness 9 on the bus 3 by ultrasonic welding, and then connect the sampling harness 9 to the BMS board through the copper bus 8 to form an integrated circuit, which simplifies the process flow, saves working hours, and improves work efficiency.

[0037] In one embodiment, referring to Figure 1 The tabs 103 between adjacent battery cells 11 are overlapped on the bus 3. Specifically, the other tab of the first battery cell except the total positive tab 101 is overlapped with one tab of the second battery cell, and the other tab of the second battery cell is overlapped with one tab of the third battery cell, and so on, until the total positive tab 101 and the total negative tab 102 are left unlapped.

[0038] In another embodiment, the number of adjacent tabs 103 overlapped on the same busbar 3 may be more than two, as long as the length of the tabs 103 is sufficient to overlap the busbar 3 .

[0039] In the above embodiment, the BMS board 2 is provided with a welding pad 201 near the total positive ear 101 and the total negative ear 102 for easy welding. When the total positive ear 101 and the total negative ear 102 are of sufficient length, no jumper 5 is required, thereby reducing the number and complexity of parts. If the total positive ear 101 and the total negative ear 102 need to be replaced or repaired, the welding pad 201 can be directly welded or thermally decomposed.

[0040] In another embodiment, the number of battery cell stacks 1 and BMS boards 2 can also be multiple, and the multiple battery cell stacks 1 are connected by copper busbars. Each BMS board 2 is set corresponding to a battery cell stack 1, collects the signals of the battery cell stack 1, and then collects and outputs the signals through the main BMS board.

[0041] In the above embodiment, the busbar 3 can be made of different materials according to different current sizes, such as aluminum busbar, copper busbar, etc.

[0042] In one embodiment, the battery cell stack 1 includes a plurality of battery cells 11 with bipolar tabs 103 on one side, and the BMS board 2 is covered on the bus bar 3. Figure 1 As shown, two pole ears 103 extend from one side of the single battery cell 11. Except for the total positive pole ear 101 and the total negative pole ear 102, the other pole ears 103 are overlapped at the bus 3 front and back. The number of pole ears 103 overlapped by a bus 3 is more than 2 pieces. Each bus 3 is connected to more than 2 battery cells 11. The BMS board 2 covers one side of the pole ear 103, that is, above the bus 3, and is directly connected to the bus 3. The total positive pole ear 101 and the total negative pole ear 102 are folded and welded to the pad 201 above the BMS board 2, so that the BMS board 2 can collect signals from the input and output ends, so as to manage the battery according to these sampled data, such as voltage balance, temperature control, charge and discharge protection, etc.

[0043] In the above embodiment, since the total positive electrode ear 101 and the total negative electrode ear 102 are located on one side of the battery cell stack 1, the BMS board 2 only needs to be arranged on the side with the electrode ear 103. The multiple battery cells 11 are stacked tightly together, and the path for the current to flow between the battery cells 11 is relatively short, which is beneficial to improving the space utilization and overall efficiency of the battery system.

[0044] In one embodiment, the battery cell stack 1 includes a plurality of battery cells 11 with pole ears 103 on opposite sides, and the two BMS boards 2 are respectively covered on the busbars 3. The pole ears 103 are provided on opposite sides of the battery cell stack 1, and the busbars 3 are distributed at both ends of the battery cell stack 1. The BMS board 2 is covered on the busbars 3 at both ends to collect signals at both ends of the battery cell stack 1, and also plays a role in protecting and fixing the battery cells 11 and the busbars 3; the pole ears 103 on both sides of the battery cell 11 can balance the current distribution inside the battery system, reduce the risk of local overheating, and improve the safety of the battery system.

[0045] In one embodiment, the battery system further includes a connector 4, and the BMS board 2 is electrically connected to the bus bar 3 or other said tabs 103 through the connector 4. Connecting the BMS board 2 and the bus bar 3 or the BMS board 2 and other said tabs 103 through the connector 4 can make the connection between the two more stable, ensuring reliable electrical connection; wherein the connector 4 can be connected and sampled by screws, bolts or welding nickel sheets according to different processes.

[0046] In the above embodiment, the bus 3 is provided with a through hole, the BMS board 2 is provided with a connection hole corresponding to the bus 3, and the connection member 4 is a bolt or a screw, and the bolt or the screw passes through the connection hole and is fixedly connected to the through hole. The BMS board 2 is placed on the battery cell stack 1, and the BMS board 2 is fixed to the bus 3 by fastening the connection member 4 such as a bolt or a screw. This connection can eliminate the sampling harness 9 and directly collect signals through the BMS board 2; the fixed fit of the bolt or the screw and the through hole prevents the BMS board 2 and the bus 3 from loosening, and can provide sufficient current flux to ensure stable signal transmission. It also becomes more convenient when the BMS board 2 needs to be maintained or replaced. The BMS board 2 can be quickly removed from the bus 3 for inspection and replacement by simply removing the bolt or the screw.

[0047] In the above embodiment, the connector 4 is a nickel sheet, and the other pole lugs 103 are welded to the BMS board 2 through the nickel sheet. The other pole lugs 103 are overlapped on the busbar, and the connector 4 can also be a nickel sheet. Each group of overlapping pole lugs 103 corresponds to a nickel sheet, and the other end of the nickel sheet is welded to the BMS board 2. At this time, the BMS board 2 is electrically connected to the other pole lugs 103, and the busbar 3 plays a supporting role.

[0048] In one embodiment, the battery system further includes a bracket 6, which is arranged at the pole ear end of the battery cell stack 1, and the bracket 6 is provided with an opening for assembling the bus 3, and the other pole ears 103 are overlapped on the bus 3 through the opening; the total positive pole ear 101 and the total negative pole ear 102 extend out of the opening and overlap the BMS board 2. Multiple bus bars 3 are assembled on the opening of the bracket 6 in sequence, and the bracket 6 can provide good bearing capacity. Then the bracket 6 is installed on the battery cell stack 1, and the multiple pole ears 103 of the battery cell 11 are connected to the bus 3 by laser welding, and the BMS board 2 is supported on the bracket 6 and welded with the total positive pole ear 101 and the total negative pole ear 102; all the battery cells 11 in the battery system are connected together through the bracket 6 and the bus 3, and the BMS board 2 plays the role of monitoring and controlling the battery system.

[0049] In the above embodiment, the bracket 6 is made of plastic material. On the one hand, the plastic bracket 6 is generally lighter than the metal bracket, which can reduce the weight of the entire battery system; on the other hand, the plastic bracket 6 is easier to process and has a lower cost than the metal bracket.

[0050] In one embodiment, the battery system further includes a strap 5, a portion of which is welded to the pad 201 on the BMS board 2, and another portion is welded to the total positive tab 101 or the total negative tab 102. The total positive tab 101 and the total negative tab 102 are overlapped with the BMS board 2 through the strap 5. When the total positive tab 101 and the total negative tab 102 are not long enough, it is inconvenient to directly weld the BMS board 2, and the total positive tab 101 and the BMS board 2, and the total negative tab 102 and the BMS board 2 need to be welded respectively through the strap 5.

[0051] In the above embodiments, the overlapping piece is L-shaped, straight-shaped or U-shaped. Figure 1 As shown, one side of the L-shaped strap 5 is welded to the pad 201 on the BMS board 2, and the other side is welded to the total positive pole ear 101 or the total negative pole ear 102. The pole ears 103 of different sizes of battery cells 11 have different lengths and widths. The style of the strap 5 can be made into different styles according to the size of the pole ears 103. Figure 7 The shape of the illustrated strap 5 is a straight line or a U-shaped strap, etc., which can ensure a firm electrical connection between the total positive electrode ear 101 or the total negative electrode ear 102 and the BMS board 2, thereby enhancing reliability and safety.

[0052] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery system, characterized in that: Including battery cell stack, busbar, BMS board; The battery cell stack is provided with a total positive electrode lug and a total negative electrode lug; The total positive electrode tab and the total negative electrode tab are respectively overlapped with the BMS board; The other tabs on the battery cell stack are overlapped on the busbar; The BMS board is electrically connected to the busbar or other tabs.

2. The battery system according to claim 1, characterized in that: The battery cell stack includes a plurality of battery cells with bipolar tabs on one side, and the BMS board cover is arranged on the busbar.

3. The battery system according to claim 1, characterized in that: The battery cell stack includes a plurality of battery cells with pole ears on two opposite sides, and the two BMS boards are respectively covered on the busbars.

4. The battery system according to claim 1, characterized in that: It also includes a connecting piece, through which the BMS board is electrically connected to the busbar or other tabs.

5. The battery system according to claim 4, characterized in that: The busbar is provided with a through hole, the BMS board is provided with a connecting hole corresponding to the busbar, the connecting member is a bolt or a screw, and the bolt or the screw passes through the connecting hole and is fixedly connected to the through hole.

6. The battery system according to claim 4, characterized in that: The connecting piece is a nickel sheet, and the other tabs are welded to the BMS board through the nickel sheet.

7. The battery system according to claim 1, characterized in that: It also includes a bracket, which is arranged at the pole ear end of the battery cell stack, and the bracket is provided with an opening for assembling the busbar, and the other pole ears are overlapped on the busbar through the opening; the total positive pole ear and the total negative pole ear extend out of the opening respectively and overlap the BMS board.

8. The battery system according to claim 7, characterized in that: The bracket is made of plastic.

9. The battery system according to claim 1, characterized in that: It also includes a strap, a portion of which is welded to the pad on the BMS board, and another portion of which is welded to the total positive electrode tab or the total negative electrode tab.

10. The battery system according to claim 9, characterized in that: The overlapping piece is L-shaped, straight-shaped or U-shaped.

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