Battery connecting piece, battery module and energy storage power supply
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN HELLO TECH ENERGY CO LTD
- Filing Date
- 2023-08-11
- Publication Date
- 2026-07-24
Smart Images
Figure CN117039348B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of new energy technology, and in particular to a battery connector, a battery module, and an energy storage power supply. Background Technology
[0002] The battery module comprises multiple rows of cells, with the two rows at each end collecting current and voltage via a power nickel strip. In existing technology, both current and voltage flow along the power nickel strip from one end to the other. Therefore, the current gradually increases from one end to the other, while the voltage gradually decreases, resulting in poor current balance and a large voltage difference. This current imbalance is reflected in the overall energy storage power supply, causing inaccurate display of remaining capacity. For example, during charging and discharging, the power supply may reach 30% charge in one hour, but the display may show 60%. After discharging for two hours, the display may show 10% remaining capacity, while the actual internal capacity remains at 30%. A large voltage difference reduces the cell cycle life and shortens the overall lifespan of the energy storage power supply.
[0003] In summary, existing power nickel strips suffer from problems such as uneven current leading to inaccurate display of remaining capacity of energy storage power supplies, and large voltage differences leading to reduced cell cycle life. Summary of the Invention
[0004] The purpose of this invention is to provide a battery connector, a battery module, and an energy storage power supply to solve the problems in the prior art where uneven current in the power nickel strip leads to inaccurate display of the remaining capacity of the energy storage power supply, and large voltage difference leads to reduced cell cycle life.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] In a first aspect, a battery connector is provided, which is used to connect multiple battery cells and conduct current. The battery connector has multiple connecting parts spaced apart along a first direction. Each of the multiple connecting parts corresponds to and is electrically connected to one of the multiple battery cells. The battery connector has a current converging point. At least one of the connecting parts is provided on both sides of the current converging point, and the current of the battery cell is conducted through the current converging point.
[0007] As a preferred embodiment of the battery connector provided by the present invention, the battery connector includes a first conductive part and a second conductive part, the first conductive part and the second conductive part converge at the current convergence point, and a plurality of connecting parts are respectively connected to the first conductive part and the second conductive part, and the current of the battery cell is conducted through the connecting parts, the first conductive part and the second conductive part.
[0008] As a preferred embodiment of the battery connector provided by the present invention, the battery connector has a plurality of notches along a first direction, and a plurality of connecting parts are respectively disposed in the plurality of notches, and are connected to the corresponding first conductive part and second conductive part through the inner wall of the notch.
[0009] As a preferred embodiment of the battery connector provided by the present invention, the connector includes a connecting lug and a bending piece. The connecting lug is connected to the inner wall of the notch through the bending piece, and the connecting lug is used to make a conductive connection with the battery cell located below the notch.
[0010] As a preferred embodiment of the battery connector provided by the present invention, the current convergence point extends into an extension section, through which the current of the battery cell flows.
[0011] As a preferred embodiment of the battery connector provided by the present invention, an additional conductive layer is stacked on the extension section, and the additional conductive layer and the extension section form a composite current guide plate, wherein the resistance value per unit length of the composite current guide plate is less than the resistance value per unit length of the extension section.
[0012] As a preferred embodiment of the battery connector provided by the present invention, a connecting wire is conductively connected at the current convergence point, and the current of the battery cell flows through the connecting wire.
[0013] As a preferred embodiment of the battery connecting piece provided by the present invention, the battery connecting piece is provided with M connecting portions spaced apart along a first direction;
[0014] If M is an even number, then the current convergence point is located between the M / 2th connection and the (M / 2)+1th connection.
[0015] If M is an odd number, the current convergence point is located between the (M+1) / 2-1th connection and the (M+1) / 2th connection; or, the current convergence point is located between the (M+1) / 2th connection and the (M+1) / 2+1th connection.
[0016] As a preferred embodiment of the battery connector provided by the present invention, the battery connector is a nickel sheet, a nickel-plated steel sheet, or a nickel-plated copper sheet.
[0017] In a second aspect, a battery module is provided, including a first cell bracket and a second cell bracket that are interlocked, multiple rows of cells spaced apart along a second direction, and a battery management system. The battery management system and the multiple rows of cells are disposed between the first cell bracket and the second cell bracket. The two rows of cells at both ends are connected by battery connecting pieces as described above, and the battery connecting pieces are electrically connected to the battery management system.
[0018] Thirdly, an energy storage power supply is provided, including a first housing, a second housing, and at least one battery module as described above, wherein the first housing and the second housing are interlocked and arranged to form a mounting cavity, and the battery module is disposed within the mounting cavity.
[0019] The beneficial effects of this invention are:
[0020] This invention provides a battery connector, a battery module, and an energy storage power supply. The battery connector is used to connect multiple battery cells and conduct current. The battery connector has a current convergence point, through which the current from the multiple battery cells is conducted. Although the current from each end of the battery connector to the current convergence point gradually increases and the voltage gradually decreases, the current variation is significantly smaller than the current difference and voltage variation at the two ends of the battery connector in existing technologies. Therefore, the current uniformity of the entire battery connector is improved, thereby improving the accuracy of the remaining capacity display of the energy storage power supply. The voltage difference of the entire battery connector is reduced, solving the problem of reduced cell cycle life caused by a large voltage difference in the battery connector. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of a battery module in the prior art;
[0022] Figure 2 This is a schematic diagram of the structure of the first power nickel strip on a battery module in the prior art;
[0023] Figure 3 This is a schematic diagram of the structure of the second power nickel strip on a battery module in the prior art;
[0024] Figure 4 This is a schematic diagram of the battery module provided in Embodiment 1 of the present invention;
[0025] Figure 5 This is a schematic diagram of the structure of the first connecting piece provided in Embodiment 1 of the present invention;
[0026] Figure 6 This is a schematic diagram of current flow on the first connecting piece provided in Embodiment 1 of the present invention;
[0027] Figure 7 This is a schematic diagram of the structure of the second connecting piece provided in Embodiment 1 of the present invention;
[0028] Figure 8 This is a schematic diagram of current flow on the second connecting piece provided in Embodiment 1 of the present invention;
[0029] Figure 9 This is a first simplified schematic diagram of the battery connector provided by the present invention;
[0030] Figure 10 This is a second simplified schematic diagram of the battery connector provided by the present invention;
[0031] Figure 11 yes Figure 4 A magnified view of a section at point C;
[0032] Figure 12 This is a schematic diagram of the battery module provided in Embodiment 2 of the present invention.
[0033] Figures 1 to 3 middle:
[0034] 10. First power nickel strip; 20. Second power nickel strip.
[0035] Figures 4 to 12 middle:
[0036] 100, First connecting piece; 200, Second connecting piece; 300, Battery cell; 400, Battery management system; 500, First battery cell bracket; 600, Second battery cell bracket; 700, Signal acquisition piece;
[0037] 1. Connecting part; 2. Current convergence point; 3. First conducting part; 4. Second conducting part; 5. Notch; 6. Extension section; 7. Hollowed-out opening; 8. Connecting wire;
[0038] 11. Connecting ear piece; 12. Bending piece. Detailed Implementation
[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction 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] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0042] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0043] like Figure 1 The diagram shown is a structural schematic of a battery module in the prior art. This battery module includes multiple rows of cells, with the two rows of cells at both ends conducting current and voltage through a first power nickel strip 10 and a second power nickel strip 20, respectively.
[0044] like Figure 2 and Figure 3 As shown, the current flow on the first power nickel strip 10 and the second power nickel strip 20 is as follows: the current output from the cells at the five sampling points (01, 02, 03, 04, 05) all flows to the right, resulting in a large current at point 06 and a small current at point 01. This current imbalance across the entire first power nickel strip 10 and second power nickel strip 20 causes inaccurate display of the remaining capacity of the energy storage power supply. Furthermore, the voltage at points 01, 02, 03, 04, 05, and 06 gradually decreases, with the highest voltage at point 01 and the lowest at point 06. This large voltage difference across the entire first power nickel strip 10 and second power nickel strip 20 reduces the cycle life of the cells and the overall lifespan of the energy storage power supply. This invention aims to solve the above problems.
[0045] Example 1
[0046] For ease of description, this embodiment introduces a first direction, a second direction, and a third direction for illustration. The first direction, the second direction, and the third direction are all perpendicular to each other.
[0047] like Figure 4The diagram shows the structure of the battery module provided in this embodiment. Specifically, the battery module includes a first cell support 500, a second cell support 600, cells 300, and a battery management system 400. The height direction of the cells 300 is the third direction, and multiple rows of cells 300 are arranged along the second direction. Multiple cells 300 in each row are spaced apart and connected in parallel along the first direction. The first cell support 500 and the second cell support 600 are provided with corresponding limiting spaces for accommodating the cells 300. The first cell support 500 and the second cell support 600 are interlocked and fastened together by screws to fix multiple cells 300 within the limiting spaces. The battery management system 400 is located on one side of the cells 300 along the first direction and is used to collect signals such as current and voltage from the cells 300. The battery management system 400 is also fixed between the first cell support 500 and the second cell support 600.
[0048] The battery module also includes battery connectors and a signal acquisition chip 700. The two rows of cells 300 at both ends are connected to the battery management system 400 via battery connectors, enabling current transmission between each row of cells 300 and the battery management system 400. One or more rows of cells 300 in the middle are connected via the signal acquisition chip 700, which is also connected to the battery management system 400 to acquire signals from the middle row of cells 300. Only the two battery connectors at both ends are used for current transmission; the current from the middle row of cells 300 converges along a second direction onto the two battery connectors. The signal acquisition chip 700 in the middle does not carry current and is only used to acquire signals from the cells 300.
[0049] like Figures 5 to 8 The diagram shows the structure of the battery connector provided in this embodiment. The battery connector connects multiple battery cells 300 to the battery management system 400, enabling the connector to conduct current between the battery cells 300 and the battery management system 400. Multiple connection portions 1 are spaced apart along a first direction on the battery connector, each corresponding to and electrically connected to one of the multiple battery cells 300, to draw current from or introduce current into the battery cells 300. The battery connector has a current converging point 2, with at least one connection portion 1 on each side of the current converging point 2, and the current from the multiple battery cells 300 is conducted through the current converging point 2.
[0050] The battery connectors are used in pairs. One is used to draw current from the battery cell 300, and the other is used to introduce current into the battery cell 300 to form a circuit. In this embodiment, the battery connector used to draw current from the battery cell 300 is used as an example for explanation. The battery connector used to introduce current into the battery cell 300 can also adopt the same structure to achieve current balancing and reduce voltage drop.
[0051] Specifically, for the battery connector used to draw current from cell 300, the current drawn from the connectors 1 on both sides of the current convergence point 2 flows to the battery management system 400 after being converged at the current convergence point 2. That is, the current drawn from the connectors 1 on both sides of the current convergence point 2 flows to the current convergence point 2 for convergence, and the current converged at the current convergence point 2 then flows to the battery management system 400.
[0052] Although the current in the two sections from the two ends of the battery connector to the current convergence point 2 shows a gradual increasing trend and the voltage shows a gradual decreasing trend, the current change amplitude is significantly smaller than the current difference at the two ends of the battery connector in the prior art, and the voltage change amplitude is significantly smaller than the voltage difference at the two ends of the battery connector in the prior art. Moreover, in the section from the current convergence point 2 to the battery management system 400, the current is the same and the voltage is stable. As a result, the current balance of the entire battery connector is improved, thereby improving the accuracy of the display of the remaining capacity of the energy storage power supply. The voltage difference of the entire battery connector is reduced, which solves the problem of reduced cycle life of the battery cell 300 due to the large voltage difference of the battery connector.
[0053] It should be noted that in this embodiment, the battery connector conducts the current of the cell 300 to the battery management system 400. In other embodiments, the current of the cell 300 can also be conducted to other components through the battery connector, and is not limited to the battery management system 400.
[0054] In this embodiment, the multiple cells 300 in a single row are connected in parallel. In other embodiments, they can also be connected in series, depending on the requirements.
[0055] like Figure 4 , Figure 5 as well as Figure 7 As shown, the current convergence point 2 is roughly located in the middle of the battery connection piece. Referring to the orientation in the figure, the current on the left side of the current convergence point 2 flows from left to right to the current convergence point 2, and the current on the right side flows from right to left to the current convergence point 2. The currents on both sides converge and then flow to the battery management system 400.
[0056] Specifically, the battery connector has M connecting portions 1 spaced apart along a first direction, where M is an integer greater than 1. If M is even, the current convergence point 2 is located between the M / 2th connecting portion 1 and the (M / 2)+1th connecting portion 1, that is, the current convergence point 2 is located between the two middle connecting portions 1. If M is odd, the current convergence point 2 is located between the (M+1) / 2-1th connecting portion 1 and the (M+1) / 2th connecting portion 1; or, the current convergence point 2 is located between the (M+1) / 2th connecting portion 1 and the (M+1) / 2+1th connecting portion 1. That is, when M is odd, the current convergence point 2 is located between the middle connecting portion 1 and an adjacent connecting portion 1.
[0057] For ease of explanation, the two battery connecting pieces set on the two rows of battery cells 300 at both ends are defined as the first connecting piece 100 and the second connecting piece 200, respectively. Figure 5 and Figure 6 The diagram shown is a structural schematic of the first connecting piece 100. Figure 7 and Figure 8 The diagram shown is a structural schematic of the second connecting piece 200.
[0058] For example, in this embodiment, a single row of battery cells 300 includes five cells 300, and correspondingly, the battery connecting piece has five connecting portions 1. Figure 5 and Figure 6 As shown, the first connecting piece 100 has a connecting part 1 at five points: A01, A02, A03, A04, and A05. The current converging point 2 is located between points A03 and A04. The current drawn from the connecting parts 1 at points A01, A02, and A03 flows from left to right to the current converging point 2, while the current drawn from the connecting parts 1 at points A04 and A05 flows from right to left to the current converging point 2. Figure 7 and Figure 8 As shown, the second connecting piece 200 has a connecting part 1 at each of the five points B01, B02, B03, B04, and B05. The current converging point 2 is located between points B03 and B04. The current drawn from the connecting parts 1 at points B01, B02, and B03 flows from left to right to the current converging point 2, while the current drawn from the connecting parts 1 at points B04 and B05 flows from right to left to the current converging point 2. Optionally, the current converging point 2 can also be located between points B02 and B03.
[0059] For example, if a single row of battery cells 300 has six cells 300, and the battery connecting piece has six connecting parts 1, then the current convergence point 2 is located between the third connecting part 1 and the fourth connecting part 1; if a single row of battery cells 300 has seven cells 300, and the battery connecting piece has seven connecting parts 1, then the current convergence point 2 is preferably located between the fourth connecting part 1 and the fifth connecting part 1, but it can also be located between the third connecting part 1 and the fourth connecting part 1.
[0060] like Figure 9The diagram shown is a simplified schematic of the battery connector. The battery connector includes a first conductive part 3 and a second conductive part 4, which converge at a current convergence point 2. Multiple connecting parts 1 are respectively connected to the first conductive part 3 and the second conductive part 4. The current in the battery cell 300 is conducted through the connecting parts 1, the first conductive part 3, and the second conductive part 4. The first conductive part 3 and the second conductive part 4 guide the current between the current convergence point 2 and the connecting parts 1, ensuring that there are two different conduction paths between the multiple connecting parts 1 and the current convergence point 2.
[0061] Specifically, in this embodiment, the first connecting piece 100 and the second connecting piece 200 used to draw current from the battery cell 300 are as follows: Figure 5 , Figure 6 , Figure 7 as well as Figure 8 As shown, the first conductive part 3 and the second conductive part 4 are respectively disposed on both sides of the connecting part 1 along the second direction. The current drawn from the connecting part 1 on the side of the current converging point 2 away from the battery management system 400 flows to the current converging point 2 along the first conductive part 3; the current drawn from the connecting part 1 on the side of the current converging point 2 close to the battery management system 400 flows to the current converging point 2 along the second conductive part 4; the current converged at the current converging point 2 flows to the battery management system 400 through the first conductive part 3.
[0062] Furthermore, such as Figure 10 As shown, an extension section 6 extends from the current convergence point 2, through which the current of the battery cell 300 flows. The current between the current convergence point 2 and the battery management system 400 is conducted through this extension section 6. Specifically, in this embodiment, the first connecting piece 100 and the second connecting piece 200 used to lead out the current of the battery cell 300, the current converged at the current convergence point 2 flows to the battery management system 400 through this extension section 6. The current on the extension section 6 is the sum of the currents of the first conducting part 3 and the second conducting part 4, and the current is the same and the voltage is stable throughout the entire extension section 6, which is beneficial to improving the current balance of the entire battery connecting piece and reducing the voltage difference of the battery connecting piece.
[0063] Specifically Figure 6 In the first connecting piece 100, the current drawn from the connecting parts 1 at points A01, A02, and A03 flows along the first conducting part 3 to the current converging point 2. The current drawn from the connecting parts 1 at points A04 and A05 flows along the second conducting part 4 to the current converging point 2. The current converged at the current converging point 2 flows to the battery management system 400 through the extension section 6.
[0064] Specifically Figure 7In the second connecting piece 200, the current drawn from the connecting parts 1 at points B01, B02, and B03 flows along the first conducting part 3 to the current converging point 2, and the current drawn from the connecting parts 1 at points B04 and B05 flows along the second conducting part 4 to the current converging point 2. The current converged at the current converging point 2 flows to the battery management system 400 through the extension section 6.
[0065] Since the current passing through extension section 6 is the sum of the currents of the single-row 300 cells, its current value is relatively large. The larger the current value, the higher the heat generated per unit time. To reduce heat generation on extension section 6 and minimize adverse effects on the battery connectors, an additional conductive layer can optionally be stacked on extension section 6. The additional conductive layer and extension section 6 form a composite current-conducting sheet, and the resistance per unit length of the composite current-conducting sheet is lower than the resistance per unit length of extension section 6. In other words, by stacking an additional conductive layer on extension section 6 to form a composite current-conducting sheet, the overall thickness of the composite current-conducting sheet is increased compared to the thickness of extension section 6, greatly increasing the cross-sectional area of the current flowing through extension section 6. This reduces internal resistance and heat generation in extension section 6, allowing extension section 6 to carry a larger current without generating excessive heat.
[0066] For example, the material of the additional conductive layer can be an aluminum sheet, a copper sheet, a nickel sheet, etc. In this embodiment, the extension section 6 uses a 0.2mm nickel sheet, and the additional conductive layer uses a 1mm aluminum sheet. The cost of aluminum sheet is lower than that of nickel sheet, so making the aluminum sheet thicker can obtain a composite flow guide with a larger cross-sectional area while saving costs.
[0067] Furthermore, the additional conductive layer is attached to the extension section 6 by laser welding.
[0068] The end of the extension segment 6 furthest from the current convergence point 2 is electrically connected to the protection board (i.e., BMS protection board) of the battery management system 400, for example, by welding, so that the current converged at the current convergence point 2 can be smoothly introduced into the battery management system 400 through the extension segment. Further, the extension segment 6 of the first connecting piece 100 and the second connecting piece 200 has a folded edge at the end near the battery management system 400. The folded edge can abut against the protection board of the battery management system 400 to position the first connecting piece 100 and the second connecting piece 200. During welding, the edge of the folded edge is spot-welded to the BMS protection board.
[0069] In order to ensure that the current drawn from the multiple connection parts 1 on the side of the current convergence point 2 close to the battery management system 400 can flow to the current convergence point 2 through the second conduction part 4 instead of flowing directly to the battery management system 400 through the extension section 6, in this embodiment, a disconnection measure is made between the second conduction part 4 and the extension section 6 to disconnect the connection between the second conduction part 4 and the extension section 6, so as to ensure that the current path between the connection part 1 connected to the second conduction part 4 and the extension section 6 must pass through the current convergence point 2.
[0070] For example, see Figure 6 A perforated opening 7 is provided between the connecting portion 1 at A04 and the connecting portion 1 at A05 on the first connecting piece 100, and a perforated opening 7 is provided between the connecting portion 1 at A05 and the extension section 6, so that the current drawn from the connecting portion 1 at A04 and the connecting portion 1 at A05 can only flow to the left along the second conducting part 4 to the current converging point 2, and there are no other flow paths. Similarly, Figure 8 A hollow opening 7 is provided between the connecting part 1 at B04 and the connecting part 1 at B05 on the second connecting piece 200. A hollow opening 7 is also provided between the connecting part 1 at B05 and the extension section 6, so that the current drawn from the connecting part 1 at B04 and the connecting part 1 at B05 can only flow to the left along the second conducting part 4 to the current convergence point 2, and there are no other flow paths.
[0071] See Figure 5 and Figure 7 Both the first connecting piece 100 and the second connecting piece 200 have multiple notches 5 along the first direction. Multiple connecting parts 1 are correspondingly disposed within the multiple notches 5 and connected to the corresponding first conductive part 3 and second conductive part 4 through the inner wall of the notches 5. The connecting parts 1 at points A01, A02, and A03 on the first connecting piece 100 and at points B01, B02, and B03 on the second connecting piece 200 are all connected to the first conductive part 3. The connecting parts 1 at points A04 and A05 on the first connecting piece 100 and at points B04 and B05 on the second connecting piece 200 are all connected to the second conductive part 4.
[0072] See Figure 5 The gaps 5 at positions A04 and A05 are connected by a hollow opening 7. The hollow opening 7 between A05 and the extension section 6 connects to the gap 5 at position A05 and passes through the battery connector, ensuring that A04, A05 and the extension section 6 are disconnected. See also Figure 7 The gaps 5 at positions B04 and B05 are connected by the hollow opening 7. The hollow opening 7 between B05 and the extension section 6 connects to the gap 5 at position B05 and passes through the battery connecting piece, ensuring that B04, B05 and the extension section 6 are disconnected.
[0073] like Figure 4 and Figure 11 As shown, the connecting part 1 includes a connecting lug 11 and a bent piece 12. The connecting lug 11 is connected to the inner wall of the notch 5 through the bent piece 12. The connecting lug 11 is used for conductive connection with the battery cell 300 located below the notch 5. The connecting lug 11 is designed to facilitate welding with the battery cell 300. The bent piece 12 can improve the overall strength and rigidity of the connecting part 1 and prevent deformation of the connecting part 1. On the other hand, it allows the connecting lug 11 to move downwards and closer to the battery cell 300, facilitating connection with the battery cell 300 and ensuring the stability of the connection between the connecting part 1 and the battery cell 300.
[0074] Optionally, the battery connecting piece is a nickel sheet. Nickel sheets have excellent electrical conductivity, high strength and good plasticity, are easy to process, and have mature welding technology, high corrosion resistance and oxidation resistance, which can improve battery stability.
[0075] In some embodiments, the battery connector can also be a nickel-plated steel sheet, which has high strength and low cost.
[0076] In other embodiments, the battery connector can also be a nickel-plated copper sheet, which has excellent electrical conductivity and strong corrosion resistance. During the actual battery design phase, the material of the battery connector can be selected according to requirements.
[0077] Optionally, in this embodiment, the battery connector is an integrally molded part, which has high strength and rigidity, is not easily deformed, and is easy to process and manufacture.
[0078] In this embodiment, the connection part 1 on the battery connecting piece is spot-welded to the battery cell 300, and the extension section 6 is also spot-welded to the battery management system 400, making the connection reliable and not easy to break.
[0079] This embodiment also provides an energy storage power supply, including a first housing, a second housing, and at least one battery module as described above. The first housing and the second housing are interlocked and arranged to form a mounting cavity, and the battery module is disposed within the mounting cavity. The energy storage power supply with this battery module can display the remaining power more accurately and has a longer service life.
[0080] Example 2
[0081] Based on the same invention and concept as Embodiment 1, this embodiment provides a battery connector and a battery module including the battery connector, the difference from Embodiment 1 being:
[0082] like Figure 12As shown, a connecting wire 8 is electrically connected between the current convergence point 2 and the battery management system 400. The current converged at the current convergence point 2 flows to the battery management system 400 through the connecting wire 8. Specifically, the end of the battery connector near the battery management system 400 is no longer soldered to the battery management system 400 to transmit current. That is, the direct connection between the battery connector and the battery management system 400 is broken, so that the current led out from the right connection part 1 of the current convergence point 2 can only flow to the left to the current convergence point 2, and the current converged at the current convergence point 2 can only be transmitted to the battery management system 400 through the connecting wire 8. In other words, the connecting wire 8 in this embodiment replaces the extension section 6 in embodiment one for conducting current.
[0083] Understandably, the battery connector is used not only to conduct current between the battery cell 300 and the battery management system 400, but also to conduct current between the battery cell 300 and other components. In this case, the end of the connecting wire 8 away from the current convergence point 2 needs to be electrically connected to the corresponding component device.
[0084] Optionally, the connecting wire 8 can be a copper wire, silver wire, nickel wire, etc. Further, the two ends of the connecting wire 8 are respectively soldered to the current convergence point 2 and the protection board of the battery management system 400.
[0085] In this embodiment, the current on both sides of the current convergence point 2 flows on one side of the battery connector. Therefore, it is only necessary to improve the existing battery connector by welding the connecting wire 8 to solve the problem of uneven current and large voltage difference on the battery connector.
[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A battery connector, characterized in that, The battery connecting piece is used to connect multiple battery cells and conduct current. Multiple connecting parts are spaced apart along a first direction on the battery connecting piece. Each of the multiple connecting parts corresponds to one of the multiple battery cells and is electrically connected. The battery connecting piece has a current converging point. At least one of the connecting parts is on both sides of the current converging point, and the current of the battery cell is conducted through the current converging point. The battery connector includes a first conductive portion and a second conductive portion. The first conductive portion and the second conductive portion are disposed on both sides of the connector along a second direction. The first conductive portion and the second conductive portion converge at the current convergence point. A plurality of connectors are respectively connected to the first conductive portion and the second conductive portion. The current of the battery cell is conducted through the connector, the first conductive portion and the second conductive portion. The battery connector has multiple notches along the first direction, and multiple connecting parts are correspondingly disposed in the multiple notches, and are connected to the corresponding first conductive part and second conductive part through the inner wall of the notch; The current convergence point extends into an extension section, through which the current of the battery cell flows, and the second conductive part is separated from the extension section by a hollow opening; The notches of the multiple connection portions near the battery management system side of the current convergence point are connected by the hollow opening.
2. The battery connector according to claim 1, characterized in that, The connecting part includes a connecting lug and a bending piece. The connecting lug is connected to the inner wall of the notch through the bending piece. The connecting lug is used to make a conductive connection with the battery cell located below the notch.
3. The battery connector according to claim 1, characterized in that, An additional conductive layer is stacked on the extension section, and the additional conductive layer and the extension section form a composite flow guide plate. The resistance value per unit length of the composite flow guide plate is less than the resistance value per unit length of the extension section.
4. The battery connector according to claim 1, characterized in that, A connecting wire is conductively connected at the current convergence point, and the current of the battery cell flows through the connecting wire.
5. The battery connector according to any one of claims 1-4, characterized in that, The battery connecting piece is provided with M connecting portions spaced apart along the first direction; If M is an even number, then the current convergence point is located between the M / 2th connection and the (M / 2)+1th connection; If M is an odd number, the current convergence point is located between the (M+1) / 2-1th connection and the (M+1) / 2th connection; or, the current convergence point is located between the (M+1) / 2th connection and the (M+1) / 2+1th connection.
6. The battery connector according to any one of claims 1-4, characterized in that, The battery connector is a nickel sheet, a nickel-plated steel sheet, or a nickel-plated copper sheet.
7. A battery module, characterized in that, The battery system includes a first and second cell support that are interlocked, multiple rows of cells spaced apart along a second direction, and a battery management system. The battery management system and the multiple rows of cells are disposed between the first and second cell supports. The two rows of cells at both ends are connected by battery connectors as described in any one of claims 1-6, and the battery connectors are electrically connected to the battery management system.
8. An energy storage power source, characterized in that, It includes a first housing, a second housing, and at least one battery module as described in claim 7, wherein the first housing and the second housing are interlocked and arranged to form a mounting cavity, and the battery module is disposed within the mounting cavity.