WO2022001168A1

WO2022001168A1 - Battery pack structure

Info

Publication number: WO2022001168A1
Application number: PCT/CN2021/080110
Authority: WO
Inventors: 柯亨钊; 戴建红
Original assignee: 浙江动一新能源动力科技股份有限公司
Priority date: 2020-06-30
Filing date: 2021-03-11
Publication date: 2022-01-06
Also published as: CN212659632U

Abstract

A battery pack structure, relating to the technical field of battery packs. The battery pack structure comprises a housing (1), and a battery cell (2) and a circuit board (3) provided inside the housing (1). The battery pack structure further comprises a supporting framework (8), the supporting framework (8) being used for mounting and positioning the battery cell (2) and the circuit board (3), the supporting framework (8) being provided with a first clamping hole (22) and a second clamping hole (23) respectively corresponding to the positive and negative electrodes of the battery cell (2); a first electrical connector (4) arranged at the first clamping hole (22), and connecting one end of the positive and negative electrodes of the battery cell (2) to the circuit board (3); a second electrical connector (5) arranged at the second clamping hole (23), and connecting the other end of the positive and negative electrodes of the battery cell (2) to the circuit board (3); and a third electrical connector (6) provided at one end of the circuit board (3), the third electrical connector (6) being configured to be electrically connected to an electric device. By adopting a compact structural design, the present invention greatly reduces the volume of the entire battery pack, and allows for a wider range of applications of the battery pack.

Description

A battery pack structure

technical field

The utility model relates to the technical field of battery packs, in particular to a battery pack structure.

Background technique

In order to improve the versatility of the power tool, so that the working range of the power tool is not limited by the position of the socket, many power tools on the market are powered by battery packs. Power tools have the characteristics of easy portability, simple operation and diverse functions, which can greatly reduce labor intensity, improve work efficiency, and realize mechanization of manual operation. Therefore, they are widely used in construction, housing decoration, automobiles, machinery, electricity, bridges, gardening and other fields. , and into the family in large numbers. For power tools, the question of whether the battery pack is suitable or not and whether the assembly is firm is very important for power tools. The existing power tool battery pack installation devices are generally directly fixed on the power tool, so it is not convenient to At the same time, due to the large volume and complex structure of the battery pack, charging and discharging are not convenient enough to be used as a mobile power supply.

Utility model content

1. Technical problems to be solved

Aiming at the above-mentioned defects in the prior art, the utility model proposes a battery pack structure, which solves the problems of complex structure and large volume of the prior battery pack.

2. Technical solutions

In order to solve the above technical problems, the present utility model provides a battery pack structure, which includes a casing, a battery cell and a circuit board arranged inside the casing, and the battery pack structure also includes a support skeleton, which is used for the battery core and the circuit board. installation positioning;

The support frame is respectively provided with a first bayonet and a second bayonet with respect to the positive and negative poles of the battery cell;

a first electrical connector, which is arranged at the first bayonet and connects one end of the positive and negative electrodes of the cell to the circuit board;

a second electrical connector, which is arranged at the second bayonet and connects the other ends of the positive and negative electrodes of the battery cells to the circuit board;

The third electrical connector is provided at one end of the circuit board, and the third electrical connector is configured to be electrically connected to the electrical device, so that the power from the cell can be supplied to the electrical device through the third electrical connector.

Wherein, the battery pack further includes a fourth electrical connector arranged at one end of the circuit board, and the fourth electrical connector is configured to be connectable to a charging source, so that electric charges can be supplied to the battery cells through the fourth electrical connector.

Wherein, the fourth electrical connector is suitable for bidirectional charging and discharging.

Wherein, the circuit board is supported on the support frame at intervals.

Wherein, the supporting frame is provided with a positioning groove at the position of the installation groove corresponding to the arc-shaped surface of the battery cell, and the first electrical connector and the second electrical connector are respectively connected to the two battery cells at the first bayonet and the second bayonet. After being bent and extended, it is connected to the circuit board through the support frame, and the bent extension section is positioned in the positioning groove.

Among them, the minimum distance between the circuit board and the supporting frame is H, and H≤2mm.

The two sides of the bottom of the support frame are provided with a number of protruding support blocks and snap-fit buckle plates, the support blocks are used to separate the circuit board from the support frame, and the snap-fit buckle plates are used to fasten the circuit board and the support frame. fixed.

Among them, the width of the circuit board is Y, the diameter of the cell is D, and Y≤0.95D.

Among them, the circuit board width Y is 20mm, and the cell diameter D is 21mm.

Among them, the two ends of the circuit board in the length direction are respectively close to the positive and negative ends of the battery cell, and the two ends of the circuit board and the positive and negative ends of the battery core are respectively provided with distances L1 and L2; L1≤5mm, L2≤5mm.

Among them, the length of the cell is L3, the length of the battery pack is L4, and L4≤1.3L3.

Among them, the length of the cell is 70mm, and the length of the battery pack is 82mm.

Among them, the diameter of the cell is D, the height of the battery pack is M, and M≤1.8D.

Among them, the diameter of the cell is 21mm, and the height of the battery pack is 36mm.

A battery pack structure includes a casing, a battery cell and a circuit board arranged inside the casing, and the battery pack structure further includes a support frame, which is used for the installation and positioning of the battery cell and the circuit board;

The support frame is provided with installation slots along the axis of the cell, and limit plates are respectively provided on both sides of the terminals of the cell. The installation slot corresponds to the arc surface of the cell, and the length of the installation slot is basically the same as the length of the cell. Consistent.

Wherein, the side of the housing opposite to the installation slot is arc-shaped, the arc-shaped surface is adapted to the outer surface of the cell, and the arc-shaped surface is combined with the installation slot and the limit plate to form the cell positioning area.

3. Beneficial effects

Compared with the prior art, the battery pack structure of the present invention adopts a single-cell battery pack structure design, so that the battery pack structure is simpler and the volume is more compact.

By adopting a compact structure design, the volume of the entire battery pack is greatly reduced, making the battery pack applicable to a wider range, including not only cordless hand-held power tools, but also garden tools, cordless vacuum cleaners, DC air compressors, etc. Power operating equipment with batteries as a power source;

Further, through the setting of the support frame, the internal structure of the battery pack such as the battery cell is tightly and reliably fixed and installed. The arrangement of the two bayonet openings and the positioning groove realizes the fixing of the first electrical connector and the second electrical connector.

Description of drawings

1 is a perspective view of a battery pack structure of the present invention;

2 is an exploded view 1 of the battery pack structure of the present invention;

3 is an exploded view 2 of the battery pack structure of the present invention;

Fig. 4 is the structural diagram of the circuit board of the utility model;

Fig. 5 is the sectional view of the utility model;

Fig. 6 is the directional view of the utility model;

Fig. 7 is the perspective view of the support frame of the present invention;

In the figure: 1 is the housing; 2 is the battery core; 3 is the circuit board; 4 is the first electrical connector; 5 is the second electrical connector; 6 is the third electrical connector; 7 is the fourth electrical connector; 8 is the support frame; 9 is the waterproof gasket; 10 is the first interface; 11 is the positioning groove; 12 is the second interface; 15 is the insulating pad; 19 is the second opening; 20 is the first casing; 21 is the second casing; 22 is the first bayonet; 23 is the second bayonet; 24 is the installation slot; 25 is the limit plate; 26 is a bump.

detailed description

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

Example 1:

A battery pack according to an embodiment of the present invention, as shown in FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 and FIG. 6 , includes a casing 1 , a battery cell 2 and a circuit board built into the casing 1 . 3. Also includes:

a first electrical connector 4, which connects one end of the positive and negative electrodes of the battery cell 2 to the circuit board 3;

The second electrical connector 5 connects the other ends of the positive and negative electrodes of the battery cell 2 with the circuit board 3;

Among them, the first electrical connector 4 and the second electrical connector 5 preferably use metal conductive nickel sheets.

As shown in FIG. 1 , in this embodiment, the third electrical connector 6 is disposed on the circuit board 3 and includes at least one first interface 10 , and the first interface 10 is used for electrical connection with external electrical equipment, so that The power from the battery cell 2 can be provided to the electrical equipment through the third electrical connector; the fourth electrical connector 7 is arranged on the circuit board 3 and includes at least one second interface 12, and the second interface 12 is used for connecting with the external The electrical equipment and the charging source are electrically connected, so that power can be provided to the electrical equipment through the second interface 12; and charge can be supplied to the battery cell 2 through the second interface 12. According to actual product requirements, the third electrical connection can be The device 6 and the fourth electrical connector 7 are arranged on the same side or opposite sides of the battery pack;

In this embodiment, the second interface 12 can be used for both discharging and charging. Specifically, the second interface 12 is a type-C interface, the first interface 10 is a pinhole terminal, and the first interface 10 is used for Power supply for various hand-held power tools, such as cordless vacuum cleaners, DC air compressors and other garden tools, etc., and the use of pinhole terminals can effectively improve the waterproof and sealing effect of the battery pack, and it is more convenient to plug in; the battery of this embodiment The package has a compact structure and can also be used as a mobile power supply. At this time, mobile devices such as mobile phones and tablets can be charged through the second interface 12 using the type-C interface, and the battery cell 2 of the battery pack can also be charged through the type-C interface. to charge.

Among them, it should be noted that:

The above-mentioned pinhole terminal at least includes positive and negative discharge holes, and further preferably, at least one signal hole for signal transmission connection with various hand-held power tools in the outside world.

Specifically, the battery pack in this embodiment further includes a support frame 8, which is used to install the battery cell 2 and the circuit board 3. As shown in FIG. 2, the battery cell 2 adopts a single-section 21700 battery cell, and the support frame 8 The upper part is an arc-shaped groove for setting the battery core 2, and an insulating pad 15 is provided between the support frame 8 and the battery core 2; it can play the role of leakage protection, especially when the skin of the battery core 2 is damaged, Guaranteed that there will be no leakage.

As shown in FIG. 7 , the support frame 8 is provided with installation grooves 24 along the axial direction of the cell 2 , and limit plates 25 are respectively provided on both sides of the ends of the cell 2 . The surfaces correspond to each other, and the length of the installation slot 24 is basically the same as the length of the cell; specifically, the side of the housing 1 opposite to the installation slot 24 is arc-shaped, and its arc-shaped surface is adapted to the outer surface of the cell 2, and the arc-shaped surface is The mounting slot 24 and the limiting plate 25 are combined to form the positioning area of the battery cell 2; that is, the cavity formed by the mounting slot 24 on the housing 1 and the supporting frame 8, and the limiting plates 25 at both ends of the mounting slot 24, the cavity is formed. For accommodating the battery cell 2, the support frame 8 is respectively provided with a first bayonet 22 and a second bayonet 23 relative to the positive and negative poles of the battery cell 2; The limiting plates 25 at both ends of the groove 24 are provided with positioning grooves 11 at the positions of the supporting skeleton 8 corresponding to the installation grooves 24 on the arc-shaped surface of the battery core, and the positioning grooves 11 are also provided with bumps 26. The connector 4 and the second electrical connector 5 are respectively connected to the two ends of the battery core 2 at the first bayonet 22 and the second bayonet 23; and after bending and extending, they are connected to the circuit board 3 through the support frame 8, and are bent and extended. The segment is positioned in the positioning groove 11 , and the bending extension is also provided with a fixing hole, and the positioning of the first electrical connector 4 and the second electrical connector 5 is realized through the cooperation of the fixing hole and the bump 26 .

As shown in FIG. 4 , the first interface 10 and/or the second interface 12 extend outward along the axis of the positive and negative electrodes of the battery cell 2 ; the second interface 12 extends outward along the axis of the positive and negative electrodes of the battery cell 2 In other words, the insertion direction of the first interface 10 and the second interface 12 is set along the direction of the longest side of the battery pack, which is more convenient to use.

In this embodiment, the casing 1 is provided with a second opening 19 corresponding to the second interface 12 ; the casing 1 is provided with a first opening 18 corresponding to the first interface 10 ; and the second interface 12 It is arranged side by side with the first interface 10 at the same end of the battery pack, that is, through the setting of the first interface 10 and the second interface 12, the problem of the multi-functional application of the battery pack in this embodiment is realized at the same time, and the overall structure is compact and easy to use. It's simple and convenient.

And there is an installation gap between the third electrical connector 6 and the support frame 8, and an installation gap between the fourth electrical connector 7 and the support frame 8. Specifically, the fourth electrical connector 7 slightly protrudes from the third electrical connector 7. The installation gaps between the electrical connector 6, the third electrical connector 6, the fourth electrical connector 7 and the support frame 8 are sealed by a waterproof gasket 9, and the waterproof gasket 9 is provided with the third electrical connector 6, The slot corresponding to the fourth electrical connector 7, the waterproof gasket 9 is sleeved on the fourth electrical connector 7, and the waterproof gasket 9 is slightly squeezed and deformed between the support frame 8 and the housing 1, and the installation The gap is completely sealed, and at the same time, it is completely in close contact with the side walls of the third electrical connector 6 and the fourth electrical connector 7 to further ensure the sealing effect, and at the same time, the fourth electrical connector 7 has a corresponding positioning and installation effect.

The battery pack in this embodiment is powered by the battery cell 2, and uses a single 21700 battery cell. The suitable power tools are not limited to cordless hand-held power tools, but also garden tools, cordless vacuum cleaners, and DC air compressors. Such as the power operation equipment that uses the secondary battery as the power source; the application range of the battery pack is greatly improved, and the overall structure is simple, and it can also be used as a portable mobile power source, with a small size and stronger functionality.

And the first electrical connector 4 and the second electrical connector 5 at least include a longitudinal bending section extending along the axis of the positive and negative electrodes of the battery cell 2, that is, the first electrical connector 4 and the second electrical connection are bent at a right angle. The device 5 is used to connect the positive and negative electrodes of the battery cell and the circuit board 3 respectively.

Example 2:

Compared with Embodiment 1, in this embodiment, in order to realize that the circuit board 3 is supported on the support frame 8 at intervals, two protruding support blocks 16 are respectively provided on both sides of the bottom of the support frame 8; 8. There are two snap-fit pinch plates 17 on both sides of the bottom, which are used to separate the circuit board 3 from the support frame 8 through the support block 16, that is, the stepped support block 16 is used to limit the circuit board 3 and the support frame 8. The distance between the two, the clip plate 17 is used to fasten and fix the circuit board 3 and the support frame 8; the minimum distance between the circuit board 3 and the support frame 8 is H, and the distance between the circuit board 3 and the support frame 8 is not equal. If the distance is greater than 2 mm, in this embodiment, H=1.57 mm; by setting the distance H, a certain heat dissipation effect is effectively ensured between the circuit board 3 and the battery core 2 .

In addition, the width of the circuit board 3 is Y, the diameter of the cell 2 is D, and the width Y is 95% or less of the width D; in this embodiment, the width Y of the circuit board 3 is 20mm, and the diameter D of the cell 2 is 21mm.

In addition, both ends of the circuit board 3 in the length direction are respectively close to the positive and negative ends of the battery cell 2, and the two ends of the circuit board 3 do not exceed the positive and negative ends of the battery core 2. The two ends of the positive and negative electrodes are respectively provided with distances L1 and L2; L1≤5mm, L2≤5mm; in this embodiment, L1=5mm, L2=5mm,

As shown in Figure 5 and Figure 6, the length of the cell 2 is L3, the length of the battery pack is L4, and L4 is 1.3 times or less of L3; the cell diameter is D, the height of the battery pack is M, and M is 1.8 of D times or less; in this embodiment, the length of the battery cell 2 is 70mm, the length of the battery pack is 82mm; the diameter of the battery cell is 21mm, and the height of the battery pack is 36mm; the above-mentioned structure can effectively ensure the battery of this embodiment. The structure of the bag is compact, and when used as a mobile power supply, it is easy to carry, and can be applied to various small electric tools at the same time.

Example 3:

Compared with Embodiment 1, in this embodiment, at least two first ports 10 are further provided on the battery pack. The first ports 10 are electrically connected to the circuit board 3 through the third electrical connector 6 , and the first ports 10 can be used In order to be electrically connected with the external electrical equipment and power supply, the power of the battery cell 2 can be provided to the electrical equipment through the first interface 10; The first interfaces 10 are respectively arranged at both ends of the battery pack; wherein the two first interfaces 10 respectively include a pinhole terminal and a USB interface, the setting of the pinhole terminal is the same as that in Embodiment 1, and the USB interface is set On the side opposite the pinhole terminals on the battery pack.

The setting of the USB interface further improves the scope of application of the battery pack in this embodiment when used as a mobile power source.

Example 4:

Compared with Embodiment 1, in this embodiment, the casing 1 includes a first casing 20 for accommodating the battery cell 2 , and at least one second casing 21 , and the second casing 21 is disposed on the battery core 2 . positive and/or negative terminals, and the first casing 20 and the second casing 21 form a closed cavity for accommodating the battery cell 2; specifically, as shown in FIG. 3, in this embodiment, the first casing The body 20 and the second shell 21 respectively have one and only one, the second shell 21 is arranged at the positive or negative end of the battery cell 2, and there is a curved and closed between the first shell 20 and the second shell 21. The separation edge is located in the same plane; and the plane where the separation edge is located is parallel to the plane where the positive electrode and the negative electrode of the cell 2 are located, that is, the edge of the second shell 21 is the separation edge that cooperates with the first shell 20, and the second The plane where the casing 21 is located is perpendicular to the axis direction of the positive and negative electrodes of the battery cell 2, and the first casing 20 is barrel-shaped; The casing 20 has an integrated structure, and the second casing 21 is embedded and fixed at the end of the first casing 20 . Specifically, the first casing 20 and the second casing 21 are fitted with each other through a snap-fit structure. It is clamped and fixed, and the separation edge of the first shell 20 and the second shell 21 is located at the outer end face of the shell 1; the structural side wall of the shell 1 in this embodiment has no visible separation edge, which reflects an integrated design. , it feels better to hold when used as a power bank.

In addition, the first casing 20 and the second casing 21 are sealed and connected by ultrasonic welding, which further improves the overall sealing performance.

Example 5:

Compared with Embodiment 3, in this embodiment, there is one and only one first casing 20 , two second casings 21 , and the second casing 21 is fixed to the first casing by sealing connection. The opposite ends of the body 20 , that is, the first shell 20 is a barrel with two transparent ends, and the two second shells 21 are of the same shape and size, and are sealed and fixed with the two ends of the first shell 20 respectively, and are connected in a sealed manner. The method is ultrasonic welding, which further improves the overall sealing.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims

A battery pack structure, comprising a casing (1), a battery cell (2) and a circuit board (3) arranged inside the casing (1), characterized in that:

The battery pack structure further comprises a support frame (8), and the support frame (8) is used for the installation and positioning of the battery cell (2) and the circuit board (3);

The supporting frame (8) is respectively provided with a first bayonet (22) and a second bayonet (23) relative to the positive and negative poles of the battery cell (2);

a first electrical connector (4), which is arranged at the first bayonet (22) and connects the positive and negative ends of the battery cell (2) to the circuit board (3);

a second electrical connector (5), which is arranged at the second bayonet (23) and connects the other ends of the positive and negative electrodes of the battery cell (2) to the circuit board (3);

A third electrical connector (6) is provided at one end of the circuit board (3), the third electrical connector (6) is configured to be electrically connected to the electrical device, so that the power from the cell (2) can pass through the Three electrical connectors (6) are provided to the electrical equipment.
The battery pack structure according to claim 1, characterized in that: the battery pack further comprises a fourth electrical connector (7) arranged at one end of the circuit board (3), the fourth electrical connector (7) ) is configured to be connectable to a charging source so that an electric charge can be supplied to the cells (2) via the fourth electrical connector (7).
The battery pack structure according to claim 2, wherein the fourth electrical connector (7) is suitable for bidirectional charging and discharging.
The battery pack structure according to claim 1, wherein the circuit board (3) is supported on the support frame (8) at intervals.
The battery pack structure according to claim 1, wherein a positioning groove (11) is provided at the position of the support frame (8) corresponding to the installation groove (24) on the arc-shaped surface of the battery cell, and the first battery The connector (4) and the second electrical connector (5) are respectively connected to both ends of the battery cell (2) at the first bayonet (22) and the second bayonet (23); and are bent After being extended, the supporting frame (8) is connected to the circuit board (3), and the bending extension section is positioned in the positioning groove (11).
The battery pack structure according to claim 1, characterized in that: the minimum distance between the circuit board (3) and the support frame (8) is H, where H≤2mm.
The battery pack structure according to claim 4, characterized in that: the two sides of the bottom of the support frame (8) are provided with a plurality of protruding support blocks (16) and snap-fit buckle plates (17), and the support A block (16) is used to space the circuit board (3) from the support frame (8), and the snap-on plate (17) is used to fasten the circuit board (3) to the support frame (8) fixed.
The battery pack structure according to claim 1, characterized in that: the width of the circuit board (3) is Y, the diameter of the cell (2) is D, and Y≤0.95D.
The battery pack structure according to claim 8, characterized in that: the width Y of the circuit board (3) is 20mm, and the diameter D of the cell (2) is 21mm.
The battery pack structure according to claim 1, characterized in that: both ends of the circuit board (3) in the length direction are respectively close to the positive and negative ends of the battery cell (2), and the two ends of the circuit board (3) Distances L1 and L2 are respectively set with the positive and negative ends of the battery cell (2); L1≤5mm, L2≤5mm.
The battery pack structure according to claim 1, characterized in that: the length of the battery cell (2) is L3, the length of the battery pack is L4, and L4≤1.3L3.
The battery pack structure according to claim 11, wherein the length of the battery cell (2) is 70mm, and the length of the battery pack is 82mm.
The battery pack structure according to claim 1, wherein the diameter of the battery cell is D, the height of the battery pack is M, and M≤1.8D.
The battery pack structure according to claim 13, wherein the diameter of the battery cell is 21 mm, and the height of the battery pack is 36 mm.
A battery pack structure, comprising a casing (1), a battery cell (2) and a circuit board (3) arranged inside the casing (1), characterized in that:

The battery pack structure further comprises a support frame (8), and the support frame (8) is used for the installation and positioning of the battery cell (2) and the circuit board (3);

The supporting frame (8) is provided with a mounting groove (24) along the axial direction of the battery core (2), and limit plates (25) are respectively provided on both sides of the terminal pole of the battery core (2), The installation groove (24) corresponds to the arc-shaped surface of the battery core (2), and the length of the installation groove (24) is substantially the same as the length of the battery core.
The battery pack structure according to claim 15, characterized in that: the side of the casing (1) opposite to the installation groove (24) is arc-shaped, and the arc-shaped surface is in contact with the battery core (2) The outer surface is adapted, and the arc-shaped surface is combined with the installation groove (24) and the limiting plate (25) to form a cell positioning area.