A battery

Abstract

This utility model discloses a battery comprising multiple cells arranged along the thickness direction. Each pair of adjacent cells is connected to form a cell group. When the total number of cells is odd, the single cell at the end constitutes a cell group. Stress-buffering components are provided between adjacent cell groups and on the outer surfaces of the two cell groups at both ends. This cell assembly method reduces the number of stress-buffering components, saves cell stacking time and labor costs, and improves assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of electrical energy storage technology, specifically to a battery. Background Technology

[0002] Currently, the batteries in electric bicycles are mainly stacked sequentially according to the number of cells. A cushioning foam is placed between each pair of adjacent cells to absorb the expansion stress of the cells. Assuming there are 15 cells, 16 cushioning foams are needed. This assembly method is relatively cumbersome, and the time spent applying the cushioning foam is too long, resulting in a slow stacking speed and affecting assembly efficiency. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a battery that saves cell stacking time and improves assembly efficiency.

[0004] This utility model provides a battery comprising a plurality of cells arranged along the thickness direction. Every two adjacent cells are connected to form a cell group. When the total number of cells is odd, the single cell at the end constitutes a cell group. Stress buffering components are provided between two adjacent cell groups and on the outer surfaces of the two cell groups at both ends.

[0005] Optionally, the battery further includes a BMS board disposed above the plurality of battery cells along the height direction, and the BMS board is electrically connected to the plurality of battery cells.

[0006] Optionally, the battery further includes a filling component and a first anti-collision component, the filling component being disposed above the BMS plate and the first anti-collision component being disposed below the plurality of battery cells.

[0007] Optionally, the battery further includes a battery casing with a receiving cavity, in which a plurality of the battery cells, the stress buffer component, the BMS board, the filling component and the first anti-collision component are disposed.

[0008] Optionally, the battery further includes a second anti-collision component and a third anti-collision component, respectively disposed on both sides of the plurality of battery cells along the width direction and between the battery casing.

[0009] Optionally, the battery casing includes a first casing, a second casing, and a lower casing. The first casing and the second casing are disposed opposite each other along the width direction. The lower casing is connected below the first casing and the second casing. The second anti-collision component and the third anti-collision component are respectively fixed on the first casing and the second casing.

[0010] Optionally, the battery further includes a flight module, which is sealed to the lower housing and electrically connected to the BMS board.

[0011] Optionally, the battery further includes an information storage unit disposed above the first housing and / or the second housing, the information storage unit being electrically connected to the BMS board.

[0012] Optionally, an adhesive filling port is provided on the outer side of the first housing or the second housing.

[0013] Optionally, the first housing and the second housing are integral die-cast magnesium alloy housings.

[0014] This utility model provides a battery comprising multiple cells arranged along the thickness direction. Each pair of adjacent cells is connected to form a cell group. When the total number of cells is odd, the single cell at the end constitutes a cell group. Stress-buffering components are provided between adjacent cell groups and on the outer surfaces of the two cell groups at both ends. This cell assembly method reduces the number of stress-buffering components, saves cell stacking time and labor costs, and improves assembly efficiency. Attached Figure Description

[0015] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0016] Figure 1 This is a top view of multiple battery cells stacked according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the process of stacking multiple battery cells and then inserting them into the casing according to an embodiment of this utility model;

[0018] Figure 3 This is a cross-sectional view of the battery according to an embodiment of the present invention from a first angle;

[0019] Figure 4 This is a cross-sectional view of the battery according to an embodiment of the present invention from a second angle;

[0020] Figure 5 This is an exploded schematic diagram of the battery according to an embodiment of the present invention.

[0021] Figure label:

[0022] 1-Battery cell; 2-Stress buffer component; 3-BMS board; 4-Filling component; 5-First anti-collision component; 6-Battery casing; 61-Receiving cavity; 62-First housing; 63-Second housing; 64-Lower housing; 65-Plug inlet; 7-Second anti-collision component; 8-Third anti-collision component; 9-Navigation plug; 10-Information storage unit; 11-Handle; 100-Battery cell assembly. Detailed Implementation

[0023] The present application is described below based on embodiments, but it is not limited to these embodiments. In the detailed description of the present application below, certain specific details are described in detail. Those skilled in the art can fully understand the present application without these details. To avoid obscuring the substance of the present application, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0024] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0027] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] Figure 1 This is a schematic diagram of the structure of multiple battery cells stacked according to an embodiment of this application. Figure 1As shown, multiple battery cells 1 are arranged and stacked sequentially along the thickness direction to form a battery cell module. These multiple battery cells 1 are divided into multiple battery cell groups 100. Every two adjacent battery cells 1 are connected to form a battery cell group 100. When the total number of battery cells 1 is odd, the single battery cell 1 at the end constitutes a battery cell group 100. That is, when the total number of battery cells 1 is even, each battery cell group 100 includes two battery cells 1; when the total number of battery cells 1 is odd, one battery cell group 100 includes a single battery cell 1, and each of the remaining battery cell groups 100 includes two battery cells 1. The battery cell 1 can be a pouch cell or a prismatic cell.

[0029] Stress buffer components 2 are provided between adjacent battery cell groups 100 and on the outer surfaces of the two outermost battery cell groups 100 at both ends. These stress buffer components 2 provide buffer space and absorb expansion stress during battery cell expansion, preventing damage to the battery cell 1. In this embodiment, the battery cell module reduces the number of stress buffer components 2 by grouping multiple battery cells and stacking them between adjacent battery cell groups and on the outer surfaces at both ends. This saves battery cell module stacking time and improves assembly efficiency. Simultaneously, this stacking method also reduces labor costs.

[0030] For example, when there are 15 cells 1, these 15 cells 1 are divided into 8 cell groups 100, requiring a total of 9 stress-buffering components 2. This is 7 fewer stress-buffering components 2 compared to existing stacking methods, thus saving stacking time and improving assembly efficiency. As another example, when there are 14 cells 1, these 14 cells 1 are divided into 7 cell groups 100, requiring a total of 8 stress-buffering components 2. This is 7 fewer stress-buffering components 2 compared to existing stacking methods, thus saving stacking time and improving assembly efficiency.

[0031] In this embodiment, the thickness direction refers to the thickness direction of the battery cell 1. The arrangement and stacking of multiple battery cells 1 along the thickness direction means that the maximum surface area of ​​the multiple battery cells 1 is set relative to each other, so that the battery cells have high structural strength on the large surface and can withstand external pressure.

[0032] In this embodiment, the stress buffer component 2 is foam. The foam is compressible, providing buffer space for the expansion of the battery cells. Simultaneously, the foam can absorb expansion stress through its own deformation, maintaining stable stacking pressure. The foam can be fixed to the surface of the battery cell or battery cell assembly by adhesive, thereby achieving the stacking connection of multiple battery cells. The shape and size of the foam are adapted to the shape and size of the battery cell 1, ensuring uniform pressure distribution to each battery cell, avoiding damage caused by localized overpressure. It also provides buffer space for expansion at different locations of the battery cell and absorbs expansion stress at different locations, extending the cycle life of the battery cell. The foam can be one of polyurethane foam, silicone foam, rubber foam, or EVA foam. In addition, the foam can also be thermally conductive foam, such as silicone foam with added ceramic particles; while providing buffering, it can also conduct heat, helping heat exchange between adjacent battery cell assemblies, making the internal temperature of the module more uniform.

[0033] In this embodiment, the two cells 1 in the cell assembly 100 are pressed and fixed together by adhesive backing. When the two cells 1 in the cell assembly 100 expand, they can expand as a whole to both sides in the thickness direction. Therefore, both cells 1 can be buffered and absorbed by the stress buffering components 2 on both sides, resulting in high battery reliability. However, when the cell assembly 100 includes three or more cells 1, the cell 1 in the middle cannot expand effectively, resulting in low reliability, shortened battery life, and a higher risk of explosion.

[0034] like Figure 2 , Figure 3 and Figure 5 As shown, the battery includes a BMS board 3, which is positioned above multiple battery cells 1 along its height. The BMS board 3 is electrically connected to the multiple battery cells 1 and is used to continuously and in real-time monitor key battery parameters, taking protective measures to prevent battery damage when the battery exceeds safety limits. Key battery parameters include the voltage of each battery cell 1, the total voltage of the entire battery, and the charging and discharging current. Protective measures taken when the battery exceeds safety limits include overvoltage protection when the cell voltage exceeds the upper limit, undervoltage protection when the voltage falls below the lower limit, overcurrent protection when the current exceeds the safety threshold, overtemperature protection when the temperature is too high, and short-circuit protection. The BMS board 3 can also communicate externally via a CAN bus, sending real-time battery status information to the vehicle controller, motor controller, charging station, and instrument panel.

[0035] Furthermore, the battery also includes a filling component 4 and a first anti-collision component 5, such as Figure 2 and Figure 3As shown in the diagram, the filling component 4 is positioned above the multiple battery cells 1, specifically above the BMS board 3. The filling component 4 reduces the space above the battery casing 6 of the multiple battery cells 1, thereby reducing the amount of potting compound used, lowering battery weight, and saving costs. Simultaneously, the filling component 4 also buffers external impacts and vibrations on the top of the multiple battery cells 1 and the BMS board 3, preventing direct contact between the multiple battery cells 1 and the top of the BMS board 3 and the top of the battery casing 6, thus preventing damage from impacts.

[0036] The first anti-collision component 5 is located below the multiple battery cells 1. The first anti-collision component 5 prevents the lower parts of the multiple battery cells 1 from directly contacting the bottom surface of the battery casing 6, thus preventing impact damage to the battery cells 1 and serving an anti-collision function. Simultaneously, since the bottom surface of the battery casing 6 generally has an aviation connector 9, and multiple wiring harnesses extend to the bottom of the multiple battery cells 1 and connect to the aviation connector 9, the first anti-collision component 5 can also prevent impact damage to the wiring harnesses and the aviation connector 9, avoiding short circuits.

[0037] like Figure 4 As shown, the battery also includes a second anti-collision component 7 and a third anti-collision component 8, which are respectively disposed on both sides of the plurality of battery cells 1 along the width direction. The second anti-collision component 7 and the third anti-collision component 8 can prevent the two sides of the plurality of battery cells 1 in the width direction from directly contacting the side wall of the battery casing 6, thereby buffering external impacts and vibrations and improving battery safety.

[0038] The two stress-buffering components 2, the filling component 4, the first anti-collision component 5, the second anti-collision component 7, and the third anti-collision component 8 provide comprehensive protection for the battery module from the outer periphery of multiple battery cells 1, improving battery safety and reliability. Optionally, the filling component 4, the first anti-collision component 5, the second anti-collision component 7, and the third anti-collision component 8 can be made of foam, which is elastic and can absorb expansion stress and buffer external impacts and vibrations. The foam can be fixed to the outer surface of the battery cell or the corresponding surface of the battery casing 6 by adhesive bonding. The foam can be one of polyurethane foam, silicone foam, rubber foam, and EVA foam. In addition, the foam can also be thermally conductive foam, such as silicone foam with added ceramic particles; this can quickly transfer heat from the battery module to the outside of the battery casing 6, improving battery life.

[0039] like Figure 4 and Figure 5As shown, the battery also includes a battery casing 6, which forms a receiving cavity 61. Multiple battery cells 1 are stacked and then disposed within the receiving cavity 61. Specifically, stress buffer components 2, BMS plates 3, filling components 4, first anti-collision components 5, second anti-collision components 7, and third anti-collision components 8, disposed on the outer peripheral surfaces of the multiple battery cells 1, are also simultaneously disposed within the receiving cavity 61, thereby forming a complete battery. Optionally, the second anti-collision components 7 and third anti-collision components 8 can also be glued and fixed to the inner side of the battery casing 6. During installation, the two sides of the battery cell module in the width direction are opposite to the second anti-collision components 7 and third anti-collision components 8, so that the second anti-collision components 7 and third anti-collision components 8 are respectively disposed on both sides of the multiple battery cells 1 along the width direction and between the battery casing 6, thereby achieving protection for both sides of the battery cells 1 along the width direction.

[0040] The battery casing 6 is used to support the weight of all internal components, including the battery cells, BMS board, wiring harness, etc. At the same time, the battery casing 6 provides electrical and environmental protection for the battery cells. The battery casing 6 can absorb and disperse impact energy, prevent the internal battery cells 1 from being squeezed, impacted or severely deformed, avoid thermal runaway, and improve the life of the battery cells 1.

[0041] In this embodiment, the battery casing 6 includes a first casing 62, a second casing 63, and a lower casing 64, as shown below. Figure 5 As shown. The first housing 62 and the second housing 63 are arranged opposite each other along their width. After the first housing 62 and the second housing 63 are connected, their bottom surfaces form a mounting hole. The lower housing 64 is installed below the first housing 62 and the second housing 63. Specifically, the lower housing 64 is installed at the mounting hole, thereby forming a sealed receiving cavity 61. Multiple battery cells 1 can be stacked and firstly installed inside the first housing 62. Then, one end of the lower housing 64 is connected to the lower part of the first housing 62. Finally, the second housing 63 is fastened to the first housing 62 and the lower housing 64 from the other side of the multiple battery cells 1 and the lower housing 64.

[0042] The second anti-collision component 7 and the third anti-collision component 8 can be fixed in the first housing 62 and the second housing 63 respectively. When the multiple battery cells 1 are installed in the battery housing 6, the two sides of the multiple battery cells 1 in the width direction are respectively installed in the first housing 62 and the second housing 63, so that the second anti-collision component 7 and the third anti-collision component 8 can protect the two sides of the multiple battery cells 1 in the width direction.

[0043] The first housing 62 and the second housing 63 are connected by bolts, and the lower housing 64 is also connected to the first housing 62 and the second housing 63 by bolts. Furthermore, the connecting surfaces of the first housing 62 and the second housing 63, the connecting surface of the lower housing 64 to the first housing 62, and the connecting surface of the lower housing 64 to the second housing 63 are respectively bonded and sealed with structural adhesive (such as epoxy resin adhesive, polyurethane adhesive, etc.) to prevent potting compound from overflowing from the connecting surfaces when it is subsequently poured into the receiving cavity 61.

[0044] The first shell 62 and the second shell 63 can be integral die-cast shells of magnesium alloy, with the lower shell being a plastic shell. Alternatively, the first shell 62 and the second shell 63 can also be made of metal (such as aluminum alloy) or other composite materials that meet the requirements for strength and protection.

[0045] like Figures 3-5 As shown, the battery also includes a flight module 9, fixed to the lower housing 64. The two ends of the flight module 9 are located inside the receiving cavity 61 and outside the battery housing 6, respectively. The flight module 9 located inside the receiving cavity 61 is electrically connected to the BMS board 3, while the flight module 9 located outside the battery housing 6 is used for connection to external electrical components. In this embodiment, the flight module 9 is sealed to the lower housing 64 by a sealing ring.

[0046] like Figure 5 As shown, the battery also includes an information storage unit 10, disposed above the first housing 62 and / or the second housing 63. The information storage unit 10 is electrically connected to the BMS board 3. The information storage unit 10 is used to store the battery's unique identification identifier, record and track relevant information throughout the battery's life cycle, etc., facilitating service personnel to read and obtain relevant battery information. The information storage unit can be an RFID tag or an NFC tag. Optionally, the information storage unit 10 can also be disposed within the receiving cavity 61 near the side wall of the housing.

[0047] The battery also includes a temperature sensor and a cooling structure, housed within the battery casing. Specifically, the temperature sensor can be located on the cell surface or at the inlet / outlet of the cooling structure. The temperature sensor is electrically connected to the BMS board, which uses the sensor to monitor the temperature and prevent overheating (risk of thermal runaway) and low-temperature charging (risk of lithium plating). The cooling structure can be liquid-cooled or air-cooled to dissipate heat from the cells.

[0048] like Figure 5 As shown, a handle 11 is also provided on the top of the battery casing 6 for easy handling of the battery. Optionally, the handle 11 is made of plastic material with insulating properties. The handle 11 is detachably connected to the battery casing 6 by bolts or the like for easy replacement.

[0049] like Figure 5As shown, a glue-filling port 65 is provided on the side of the battery casing 6. Specifically, the glue-filling port 65 is located on the outer surface of the first casing 62 or the second casing 63. After assembly, glue is poured into the receiving cavity 61 through the glue-filling port 65. After glue filling, a cover plate is connected to the outside of the glue-filling port 65 to completely seal the battery casing 6. This glue-filling method is lateral glue filling, which is faster than forward glue filling and can improve production efficiency. Glue filling can seal and fix the battery cell 1, and can also be used for heat conduction to improve the heat dissipation efficiency of the battery cell.

[0050] The battery cell module in this embodiment reduces the number of stress-buffering components by grouping multiple cells and stacking them with stress-buffering components between adjacent cell groups and on the outer surfaces of both ends. This saves cell module stacking time and labor costs, improving assembly efficiency. Simultaneously, the cell modules are directly placed into the battery casing after stacking, reducing assembly steps and increasing casing strength. A glue-filling port is provided on the side of the battery casing, allowing the glue-filling process to be performed from the side of the battery casing, increasing glue-filling speed and further improving production efficiency.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, characterized in that, The battery includes a plurality of cells (1) arranged along the thickness direction. Every two adjacent cells (1) are connected to form a cell group (100). When the total number of cells (1) is odd, the single cell (1) at the end constitutes a cell group (100). Stress buffer members (2) are provided between two adjacent cell groups (100) and on the outer surfaces of the two cell groups (100) at both ends.

2. The battery according to claim 1, characterized in that, The battery also includes a BMS board (3), which is disposed above the plurality of battery cells (1) along the height direction, and the BMS board (3) is electrically connected to the plurality of battery cells (1).

3. The battery according to claim 2, characterized in that, The battery also includes a filling component (4) and a first anti-collision component (5), the filling component (4) being disposed above the BMS board (3) and the first anti-collision component (5) being disposed below the plurality of battery cells (1).

4. The battery according to claim 3, characterized in that, The battery also includes a battery casing (6), which has a receiving cavity (61) in which a plurality of battery cells (1), the stress buffer component (2), the BMS board (3), the filling component (4) and the first anti-collision component (5) are disposed.

5. The battery according to claim 4, characterized in that, The battery also includes a second anti-collision component (7) and a third anti-collision component (8), which are respectively disposed on both sides of the plurality of cells (1) along the width direction and between the battery casing (6).

6. The battery according to claim 5, characterized in that, The battery casing (6) includes a first casing (62), a second casing (63), and a lower casing (64). The first casing (62) and the second casing (63) are arranged opposite each other in the width direction. The lower casing (64) is connected below the first casing (62) and the second casing (63). The second anti-collision component (7) and the third anti-collision component (8) are respectively fixed on the first casing (62) and the second casing (63).

7. The battery according to claim 6, characterized in that, The battery also includes a flight module (9), which is sealed to the lower shell (64) and is electrically connected to the BMS board (3).

8. The battery according to claim 6, characterized in that, The battery also includes an information storage unit (10) disposed above the first housing (62) and / or the second housing (63), and the information storage unit (10) is electrically connected to the BMS board (3).

9. The battery according to claim 6, characterized in that, An adhesive filling port (65) is provided on the outer side of the first housing (62) or the second housing (63).

10. The battery according to claim 6, characterized in that, The first housing (62) and the second housing (63) are integral die-cast magnesium alloy housings.

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