Battery pack

Abstract

This utility model relates to a battery pack, comprising: a housing, the housing including a matching upper cover and a lower cover; a cell assembly located within the housing, the cell assembly including a plurality of cells arranged in parallel; a circuit board located within the housing and between the cells and the upper cover; and a connecting piece located within the housing and connecting the cells and the circuit board respectively; wherein, the connecting piece includes a main body and an extension connected to the main body, the main body being located at the end of the cell and electrically connected to the cell, the extension extending outward from the main body and electrically connected to the circuit board, the battery pack having a movement axis along which the battery pack is moved out or loaded onto a charger or power tool, and at least a portion of the extension of the connecting piece being straight and perpendicular to the movement axis; this facilitates the standardization of the procurement and arrangement of the circuit board and the connecting piece, saves internal space of the battery pack, and reduces battery pack production costs.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack. Background Technology

[0002] Battery packs come in a wide variety of types, each containing multiple different battery cells, and the connection methods between cells or between cells and circuit boards often differ. Since cells or cell assemblies and circuit boards need to be connected via conductive connectors, but the internal space of a battery pack is generally limited, this poses a challenge to the internal structural design of increasingly diverse battery pack products. Currently available battery pack connectors still suffer from insufficient standardization, with their arrangement often being haphazard. Poor connector placement can easily lead to increased costs and wasted space.

[0003] Therefore, it is indeed necessary to provide an improved battery pack to overcome the shortcomings of the existing technology. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a battery pack that aims to optimize the shape and connection relationship of the connecting pieces and reduce the manufacturing cost of the battery pack.

[0005] This application provides a battery pack, comprising:

[0006] A housing, the housing comprising a mating upper cover and a lower cover;

[0007] A battery cell assembly is located inside the housing, and the battery cell assembly includes a plurality of battery cells arranged in parallel.

[0008] The circuit board is located inside the housing and between the battery cell and the top cover;

[0009] A connecting piece is located inside the housing and connects the battery cell and the circuit board respectively;

[0010] The connecting piece includes a main body and an extension connected to the main body. The main body is located at the end of the battery cell and is electrically connected to the battery cell. The extension extends outward from the main body and is electrically connected to the circuit board. The battery pack has a movement axis along the battery pack to be moved out or loaded into a charger or power tool. At least a portion of the extension of the connecting piece is straight and perpendicular to the movement axis.

[0011] A further improvement is that the battery cell is a cylindrical battery cell.

[0012] A further improvement is as follows: the connecting piece includes a first connecting piece and a second connecting piece, wherein the extension of the first connecting piece is straight and perpendicular to the axis of motion, and the extension of the second connecting piece is partially bent.

[0013] A further improvement is that the second connecting piece is at least partially parallel to the axis of motion.

[0014] A further improvement is that the number of the first connecting pieces is greater than the number of the second connecting pieces.

[0015] A further improvement is that the number of battery cells connected to each of the first connecting pieces is greater than the number of battery cells connected to each of the second connecting pieces.

[0016] A further improvement is as follows: each of the first connecting pieces is connected to an even number of battery cells, and each of the second connecting pieces is connected to an odd number of battery cells.

[0017] A further improvement is as follows: the battery pack includes a plurality of cell groups arranged along the axis of motion, and each cell group includes at least 6 cells.

[0018] A further improvement is proposed: each of the aforementioned cell packs comprises 15 cells.

[0019] A further improvement is that the rated voltage of the battery pack is 40V.

[0020] The battery pack provided in this embodiment includes: a housing, the housing including a matching upper cover and a lower cover; a cell assembly located within the housing, the cell assembly including a plurality of cells arranged in parallel; a circuit board located within the housing and between the cells and the upper cover; and a connecting piece located within the housing and connecting the cells and the circuit board respectively. The connecting piece includes a main body and an extension connected to the main body. The main body is located at the end of the cell and electrically connected to the cell. The extension extends outward from the main body and is electrically connected to the circuit board. The battery pack has a movement axis along which it is moved out of or loaded onto a charger or power tool. At least a portion of the extension of the connecting piece is straight and perpendicular to the movement axis. The extension of the connecting piece has a significant impact on the utilization of the internal space of the battery pack. Maintaining a vertical arrangement shortens the connection path, which is beneficial for the standardization of the procurement and arrangement of the circuit board and the connecting piece, saving internal space of the battery pack and reducing battery pack production costs. Attached Figure Description

[0021] Figure 1 One perspective view of a battery pack provided according to an embodiment of the present utility model;

[0022] Figure 2 An exploded view of a battery pack provided in an embodiment of this utility model;

[0023] Figure 3 A second perspective view of a battery pack provided in an embodiment of this utility model;

[0024] Figure 4 One of the partial schematic diagrams of a battery pack provided in an embodiment of the present utility model;

[0025] Figure 5 This is a second partial schematic diagram of a battery pack provided in one embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0027] The terminology used in this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model. For example, terms such as "upper," "lower," "front," and "rear," indicating orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. The term "comprising" as used in the specification and claims is an open-ended term and should be interpreted as "including but not limited to." "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain error range. Furthermore, in the embodiments of this application, "multiple" refers to two or more. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0028] To address the issue of insufficient standardization in existing battery pack connectors, where their arrangement is often arbitrary and poor connector placement can lead to increased costs and wasted space, this invention provides a battery pack. The battery pack includes a housing 10 and battery cells 20. The housing 10 includes a matching upper cover 11 and a lower cover 12. The battery cells 20 are disposed inside the housing 10 and surrounded by the upper and lower covers 11 and 12. The battery pack also includes a connecting portion 40, which is located on the upper cover 11 and includes a guide rail 41 connecting the battery pack to a charger or power tool. Specifically, the guide rail 41 can be used to connect the battery pack to a power tool or to a charger; connecting the battery pack to the power tool or charger completes the loading process, while disconnection indicates that the battery pack is being or has been removed from the battery pack. The battery pack also has a movement axis A along which it is moved from or loaded to the charger or power tool.

[0029] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0030] refer to Figures 1-5The battery pack includes battery cells 20 and a housing 10 surrounding the battery cells 20. In one embodiment of the present invention, the housing 10 may include an upper cover 11 and a lower cover 12, which can be connected by means of snaps or screws. It is understood that the housing 10 can be configured separately as needed; for example, the housing 10 may be configured to include an upper housing, a lower housing, a left housing, and a right housing.

[0031] The top of the cover 11 has a connecting portion 40, which includes terminals for electrically connecting the battery pack to an electrical appliance or charger. The electrical appliance can be a power tool, allowing the battery pack to supply power to it. The power tool can be a handheld power tool, including drills, hammer drills, and angle grinders, as well as various garden tools, including lawnmowers, hair dryers, and mowers. In one embodiment, guide rails 41 are provided on both sides of the terminals for easy insertion into the power tool or charger. In an embodiment of this invention, the cover 11 is provided with a locking portion 50 for locking to the power tool. After the battery pack is inserted into the power tool via its guide rails 41, the locking portion 50 locks the battery pack to the power tool to prevent it from accidentally falling out.

[0032] In one embodiment, the battery pack is a rechargeable battery pack, and preferably, the battery cells 20 of the battery pack are lithium-ion cells. It is understood that other types of cells 20 may also be used in the battery pack, or a mixture of different types of cells 20 may be used. For example, the battery pack may include sodium-ion cells, or simultaneously include sodium-ion cells and lithium-ion cells.

[0033] The battery pack of this invention may include one or more battery cells 20. Preferably, the battery pack includes 30 battery cells 20. It is understood that the battery pack may also include other numbers of battery cells 20, such as 15 battery cells 20 or 45 battery cells 20. Different battery cells 20 can be connected in various ways, such as series, parallel, or mixed series. The rated voltage of the battery pack may be 18V, 40V, or 58V, etc., and preferably, the rated voltage of the battery pack is 40V.

[0034] In one embodiment of this utility model, multiple battery cells form a cell group. Depending on different requirements, the battery pack can be configured with two, three, or more cell groups. Preferably, the battery pack includes two cell groups; the two cell groups can be arranged front-to-back and electrically connected by connecting tabs. Each cell group can include 6, 12, or 15 cells 20 or more, preferably 15 cells 20. It is understood that the battery pack can also include other numbers of cell groups, and the cell groups can also include other numbers of cells 20.

[0035] In one embodiment, the battery pack includes battery cells 20 with the same specifications. However, battery cells 20 with different specifications can also be used without departing from the scope of this invention. For example, the battery pack may include 18650 type battery cells or 21700 type battery cells, or both types of battery cells 20. The battery cells 20 may have the same shape or different shapes. For example, the battery pack may include cylindrical battery cells or pouch-shaped battery cells, or both types of battery cells 20. Preferably, the battery cells are cylindrical.

[0036] The battery pack includes a circuit board 60 disposed within the housing 10. In one embodiment of the present invention, the circuit board 60 is disposed on one side of the battery cell 20, and the battery cell 20 is electrically connected to the circuit board 60 via a connecting piece. The connecting piece is a conductor made of metal, such as copper sheet. Preferably, the circuit board 60 is located in the inner region of the upper cover 11, the connecting part 40 is located above the circuit board 60, the battery cell 20 is located below the circuit board 60, and the wiring terminals are connected to the circuit board 60. The wiring terminals are electrically connected to the battery cell 20 through the circuit board 60 and the connecting piece.

[0037] In one embodiment of this utility model, the battery cell assembly includes multiple battery cells arranged in parallel; connecting pieces are located inside the housing and respectively connect the battery cells and the circuit board 60. Specifically, the connecting piece includes a main body 73 and an extension 74 connected to the main body 73. The main body 73 is located at the end of the battery cell and electrically connected to the battery cell, and the extension 74 extends outward from the main body 73 and is electrically connected to the circuit board 60. The main body 73 of the connecting piece is generally located in the end region of the battery cell. As a direct conductive part with the battery cell, the circuit board 60 is a certain distance away from the main body 73. The extension 74 is used to connect the main body 73 and the circuit board 60. The extension path length of the extension 74 is set according to factors such as the distance between the circuit board 60 and the main body 73. The battery pack of this embodiment has a movement axis along which the battery pack is moved out or loaded into a charger or power tool. At least a portion of the extension 74 of the connecting piece is straight and perpendicular to the movement axis, that is, the extension 74 of the connecting piece is vertically upward without bending. Correspondingly, the circuit board 60 has at least a portion located directly above the straight extension 74 that connects to the extension 74. The above arrangement can shorten the connection path, which is conducive to the standardization of the procurement and layout of circuit board 60 and connecting piece, saves internal space of battery pack, and reduces battery pack production costs.

[0038] In one embodiment of this utility model, the connecting piece includes a first connecting piece 71 and a second connecting piece 72. The extension 74 of the first connecting piece 71 is straight and perpendicular to the axis of motion, while the extension 74 of the second connecting piece 72 is partially curved. Preferably, the second connecting piece 72 is at least partially parallel to the axis of motion, that is, the second connecting piece 72 has a portion parallel to the axis of the battery cell. Preferably, the number of first connecting pieces 71 is greater than the number of second connecting pieces 72, and the number of battery cells connected to each first connecting piece 71 is greater than the number of battery cells connected to each second connecting piece 72, in order to maximize the number of connecting pieces that are directly connected to the circuit board 60. Preferably, each first connecting piece 71 is connected to an even number of battery cells, and each second connecting piece 72 is connected to an odd number of battery cells; for example, each first connecting piece 71 is connected to 6 battery cells, and each second connecting piece 72 is connected to 3 battery cells; of course, each first connecting piece 71 can also be connected to 2, 4, 8... numbers of battery cells, and each first connecting piece 71 can also be connected to 1, 3, 5... numbers of battery cells.

[0039] In one embodiment of this utility model, the battery pack includes a plurality of cell groups arranged along the axis of motion, such as 2 groups, 3 groups, 4 groups, etc. Preferably, the battery pack includes two groups of cells; each group of cells includes at least 6 cells, such as 6, 9, 12, 15, etc. Preferably, each group of cells includes 15 cells.

[0040] In one embodiment of this utility model, to facilitate the removal or loading of the battery pack, the lower cover 12 is provided with a groove 30 for applying force with fingers to move the battery pack along the guide rail 41. The groove is formed by an inward recess from the outer surface of the lower cover 12. A person's fingers can be inserted into the groove 30 to assist in operating the battery pack, such as moving it into a power tool. It is understood that removing the battery pack from the power tool can also be assisted by applying force with fingers in the groove 30 in the direction of movement. The above operation can also be used between the battery pack and the charger, and will not be elaborated further.

[0041] The top cover 11 is provided with a locking part 50 for finger pressing operation to lock the battery pack to the charger or power tool. The locking part 50 can be a hook structure, magnetic structure, etc. In the example of this utility model, the locking part 50 consists of a push-button switch and a stop block located in the area of ​​the top cover 11. Pressing the push-button switch retracts the stop block, releasing the locked battery pack so that it can move; releasing the push-button switch releases the stop block, locking the battery pack so that it cannot move. The groove 30 is specifically located in a position that can be simultaneously reached by one hand when pressing the locking part 50, so that the user can operate the locking part 50 and the groove 30 at the same time using different fingers of one hand to achieve one-handed unlocking and movement of the battery pack. Taking the battery pack, which is roughly rectangular in shape, as an example, the front and rear parts of the battery pack are evenly divided along the longitudinal direction of the battery pack. When the locking part 50 is located in the front part, the groove 30 is also located in the front part, so that the locking part 50 and the groove 30 can be operated simultaneously with one hand.

[0042] The battery pack provided in this embodiment includes: a housing, comprising a matching upper cover and a lower cover; a cell assembly located within the housing, comprising multiple cells arranged in parallel; a circuit board 60 located within the housing and positioned between the cells and the upper cover; and a connecting piece located within the housing and connecting the cells and the circuit board 60 respectively. The connecting piece includes a main body 73 and an extension 74 connected to the main body 73. The main body 73 is located at the end of the cell and electrically connected to it. The extension 74 extends outward from the main body 73 and is electrically connected to the circuit board 60. The battery pack has a movement axis along which it is moved out of or loaded onto a charger or power tool. At least a portion of the extension 74 of the connecting piece is straight and perpendicular to the movement axis. The extension 74 of the connecting piece has a significant impact on the utilization of the internal space of the battery pack. Maintaining a vertical arrangement shortens the connection path, which is beneficial for the standardization of the procurement and arrangement of the circuit board 60 and the connecting piece, saving internal space of the battery pack and reducing battery pack production costs.

[0043] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A battery pack, characterized in that, include: A housing, the housing comprising a mating upper cover and a lower cover; A battery cell assembly is located inside the housing, and the battery cell assembly includes a plurality of battery cells arranged in parallel. The circuit board is located inside the housing and between the battery cell and the top cover; A connecting piece is located inside the housing and connects the battery cell and the circuit board respectively; The connecting piece includes a main body and an extension connected to the main body. The main body is located at the end of the battery cell and is electrically connected to the battery cell. The extension extends outward from the main body and is electrically connected to the circuit board. The battery pack has a movement axis along the battery pack to be moved out or loaded into a charger or power tool. At least a portion of the extension of the connecting piece is straight and perpendicular to the movement axis.

2. The battery pack according to claim 1, characterized in that, The battery cell is a cylindrical battery cell.

3. The battery pack according to claim 1, characterized in that, The connecting piece includes a first connecting piece and a second connecting piece, wherein the extension of the first connecting piece is straight and perpendicular to the axis of motion, and the extension of the second connecting piece is partially bent.

4. The battery pack according to claim 3, characterized in that, The second connecting piece is at least partially parallel to the axis of motion.

5. The battery pack according to claim 3, characterized in that, The number of the first connecting pieces is greater than the number of the second connecting pieces.

6. The battery pack according to claim 3, characterized in that, The number of cells connected to each of the first connecting pieces is greater than the number of cells connected to each of the second connecting pieces.

7. The battery pack according to claim 3, characterized in that, Each of the first connecting pieces is connected to an even number of battery cells, and each of the second connecting pieces is connected to an odd number of battery cells.

8. The battery pack according to claim 1, characterized in that, The battery pack includes a plurality of cell groups arranged along the axis of motion, each cell group including at least 6 cells.

9. The battery pack according to claim 8, characterized in that, Each of the aforementioned cell packs comprises 15 cells.

10. The battery pack according to claim 1, characterized in that, The battery pack has a rated voltage of 40V.

Images