CN216597800U

CN216597800U - Battery pack

Info

Publication number: CN216597800U
Application number: CN202121810184.XU
Authority: CN
Inventors: 黎仕荣; 李林昌; 徐国波
Original assignee: Dongguan Chuangming Battery Technology Co Ltd
Current assignee: Dongguan Chuangzhimei Technology Co ltd
Priority date: 2021-08-04
Filing date: 2021-08-04
Publication date: 2022-05-24
Anticipated expiration: 2031-08-04

Abstract

The utility model discloses a battery pack which comprises four cylindrical battery cells, a first bracket and a second bracket, wherein a first fixing groove is formed on the inner side of the first bracket, and a plurality of clamping grooves are formed on the side wall of the first bracket; the second support includes the main part, the inboard of main part is formed with the second fixed slot, the edge of main part extends four linking arms towards first support, four linking arms are defined out the electric core accommodation space that the cross-section roughly is the square, four linking arms correspond the middle part on each limit of square respectively, the linking arm is including the wide portion that is located its outside and the narrow portion that is located its inboard, the free end of narrow portion surpasss wide portion and to be equipped with the clamping part to the evagination, the narrow portion goes deep into the recess that forms between the cambered surface of adjacent electric core, the free end of narrow portion stretches into first fixed slot, the clamping part buckle is in the draw-in groove. By adopting the utility model, the anti-falling performance of the battery pack can be improved; and the assembly process of the battery pack is simple, which is beneficial to improving the production efficiency.

Description

Battery pack

Technical Field

The utility model relates to the field of batteries, in particular to a battery pack.

Background

The existing scheme of combining a plurality of battery cores into a battery pack mostly uses gummed paper materials or heat-shrinkable sleeves to fix the plurality of battery cores, but the battery pack formed by combining the above modes has poor drop resistance, the gummed paper materials or the heat-shrinkable sleeves cannot effectively protect the battery cores, and the battery pack has a complex production process and low production efficiency, and is not beneficial to realizing the automatic assembly of the battery pack.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack which has good anti-drop performance and is easy to assemble, and the battery pack is beneficial to improving the production efficiency of the battery pack.

In order to achieve the purpose, the utility model discloses a battery pack which comprises four cylindrical battery cells, a first bracket and a second bracket, wherein the four battery cells are closely arranged in a matrix; a first fixing groove sleeved with one end of each of the four battery cells is formed in the inner side of the first support, and a plurality of clamping grooves are formed in the side wall of the first support;

the second support includes the main part, the inboard of main part is formed with cup joints four the second fixed slot of electric core, the edge orientation of main part four linking arms, four are extended to first support the linking arm is defined out the electric core accommodation space that the cross-section roughly is the square, four the linking arm corresponds the middle part on each limit of square respectively, the linking arm is including the wide portion that is located its outside and the narrow portion that is located its inboard, the free end of narrow portion surpasss wide portion just is equipped with buckling part to the evagination, narrow portion is deep and is adjacent the recess that forms between the cambered surface of electric core, the free end of narrow portion stretches into first fixed slot, the buckling part buckle is in the draw-in groove.

The battery cell is fixed and protected by arranging the first support and the second support, so that the structural stability and the drop resistance of the battery pack are improved, the structure is simple, and the production cost of the battery pack can be reduced. The second support passes through the linking arm to be connected with first support block, and the equipment process is simple, is favorable to improving the production efficiency of group battery.

Optionally, the narrow portion is tapered.

Alternatively, an end surface of the free end of the wide portion may form a step surface, and the side wall of the first holder may be supported on each of the step surfaces.

Optionally, the bottom wall of the first fixing groove and the bottom wall of the second fixing groove are respectively provided with a plurality of through holes, the through holes are respectively provided with conducting strips, and the conducting strips comprise three first conducting strips and two second conducting strips;

the two first conductive sheets are covered on one end face of the battery cell, the other first conductive sheet is covered on the other end face of the battery cell and is respectively and electrically connected with the electrodes of the two adjacent battery cells so as to enable all the battery cells to be connected in series, and the two second conductive sheets are respectively and electrically connected with the total positive electrode and the total negative electrode of all the battery cells connected in series.

Optionally, the one end of first support or the second support is formed with the mounting groove, the through-hole intercommunication the mounting groove with first fixed slot or the second fixed slot, the mounting groove is provided with battery protection circuit, battery protection circuit with set up at same end the conducting strip electricity is connected, battery protection circuit passes through the conducting wire and sets up keeping away from the one end of mounting groove the conducting strip electricity is connected.

Optionally, two connecting arms are provided with wire grooves penetrating along the extending direction of the connecting arms, and the wire grooves are used for placing the conductive wires; the installation groove is formed in the first support, a connection hole communicated with the first fixing groove is formed in the bottom wall of the installation groove, the connection hole is opposite to the lead groove, and the conducting wire penetrates through the connection hole and is electrically connected with the battery protection circuit.

Optionally, the battery protection circuit is disposed on a circuit board, a first insulating sheet is attached between the circuit board and the bottom wall of the mounting groove, and a second insulating sheet is attached to a side of the circuit board opposite to the first insulating sheet; keep away from the one end of circuit board the conducting strip facial make-up is equipped with the third insulating piece.

Optionally, a notch is formed in the side wall of the mounting groove, the notch is communicated with the corresponding through hole, a connection point of the battery protection circuit and the conducting strip is arranged at the edge position of the circuit board, which is just opposite to the notch, and the conducting strip is connected to the connection point through the notch.

Drawings

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present invention.

Fig. 2 is an exploded view schematically illustrating a battery pack according to an embodiment of the present invention.

Fig. 3 is an exploded view of the first bracket and the second bracket according to the embodiment of the present invention.

Fig. 4 is an exploded view of the second bracket, the conductive sheet, the insulating paper and the circuit board according to the embodiment of the utility model.

Fig. 5 is a schematic structural diagram of a battery protection circuit according to an embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.

Referring to fig. 1 to 4, the present invention discloses a battery pack 100, which is characterized by including four cylindrical battery cells 2, a first bracket 11 and a second bracket 12;

the four electric cores 2 are arranged in a matrix and are close to each other;

a first fixing groove 131 which is sleeved with one end of each of the four battery cells 2 is formed on the inner side of the first support 11, and a plurality of clamping grooves 111 are formed on the side wall of the first support 11;

the second bracket 12 includes a main body 121, a second fixing groove 132 for receiving four battery cells 2 is formed on the inner side of the main body 121, four connecting arms 14 extend from the edge of the main body 121 toward the first bracket 11, the four connecting arms 14 define a battery cell 2 accommodating space having a substantially square cross section, the four connecting arms 14 respectively correspond to the middle of each side of the square, each connecting arm 14 includes a wide portion 141 located on the outer side thereof and a narrow portion 142 located on the inner side thereof, the free end of the narrow portion 142 exceeds the wide portion 141 and is provided with a buckling portion 143 protruding outward, the narrow portion 142 extends into the groove 20 formed between the arc surfaces of the adjacent battery cells 2, the free end of the narrow portion 142 extends into the first fixing groove 131, and the buckling portion 143 is buckled in the slot 111.

The battery cell 2 is fixed and protected by the first support 11 and the second support 12, so that the structural stability and the drop resistance of the battery pack 100 are improved, the structure is simple, and the production cost of the battery pack 100 can be reduced. The second bracket 12 is connected with the first bracket 11 through the connecting arm 14 in a clamping manner, so that the assembly process is simple, and the production efficiency of the battery pack 100 is improved.

Specifically, the battery pack 100 of the present invention is suitable for electronic devices such as a sweeper and a sweeping robot.

Referring to fig. 2 and 3, preferably, the narrow portion 142 is tapered, and the narrow portion 142 is tightly attached to two adjacent battery cells 2, which is beneficial to improving the structural stability of the battery pack 100.

Referring to fig. 2 and 3, preferably, the end surface of the free end of the wide portion 141 is formed with a step surface 144, and the side wall of the first bracket 11 is supported on each step surface 144, which is beneficial to improving the stability of the snap connection between the first bracket 11 and the second bracket 12.

Referring to fig. 2 to 4, the bottom walls of the first fixing groove 131 and the second fixing groove 132 are respectively provided with a plurality of through holes 130, the through holes 130 are respectively provided with the conductive sheets 3, and the conductive sheets 3 include three first conductive sheets 31 and two second conductive sheets 32; the two first conductive sheets 31 are covered on one end surface of the electric core 2, the other first conductive sheet 31 is covered on the other end surface of the electric core 2, and is respectively electrically connected with the electrodes of the two adjacent electric cores 2 so as to connect all the electric cores 2 in series, and the two second conductive sheets 32 are respectively electrically connected with the total positive electrode and the total negative electrode of all the electric cores 2 in series.

In this embodiment, the conducting strip 3 is a nickel strip, and two adjacent electric cores 2 are oppositely disposed, so that four electric cores 2 are connected in series by using the conducting strip 3. The shape of the through hole 130 matches with the conductive sheet 3, so that the conductive sheet 3 and the battery cell 2 are matched more closely.

Referring to fig. 2 to 4, a mounting groove 15 is formed at one end of the first bracket 11 or the second bracket 12, the through hole 130 communicates the mounting groove 15 with the first fixing groove 131 or the second fixing groove 132, the mounting groove 15 is provided with a battery protection circuit, the battery protection circuit is electrically connected with the conductive sheet 3 disposed at the same end, and the battery protection circuit is electrically connected with the conductive sheet 3 disposed at one end far from the mounting groove 15 through the conductive wire 4. In the present embodiment, the mounting groove 15 is provided at one end of the first bracket 11, and the through hole 130 communicates the mounting groove 15 with the first fixing groove 131, but is not limited thereto.

Preferably, the two connecting arms 14 are provided with wire slots 16 penetrating along the extending direction thereof, the wire slots 16 are used for placing the conductive wires 4; the installation groove is formed on the first bracket, the bottom wall of the installation groove 15 is provided with a connection hole 17 communicated with the first fixing groove, the connection hole 17 is opposite to the wire groove 16, and the conductive wire 4 passes through the connection hole 17 and is electrically connected with the battery protection circuit.

Referring to fig. 2, 4 and 5, the battery protection circuit includes a first circuit protection chip U1, a second circuit protection chip U2, a first field effect transistor Q4, a second field effect transistor Q5, a third field effect transistor Q3 and a three-terminal fuse F1, where the first circuit protection chip U1 and the second circuit protection chip U2 are used to detect the power-on conditions of connection nodes B1, B2 and B3 of two adjacent battery cells 2 in the battery cells 2 connected in series and the total positive electrode B + and the total negative electrode B-of the battery cells 2 connected in series;

when the first circuit protection chip U1 detects the power-on condition of overlarge voltage, the grid of the second field-effect tube Q5 is started, the total negative pole B-is disconnected from the external negative pole P-of the battery pack 100, and the charging loop of the battery pack 100 is disconnected; if the first circuit protection chip U1 cannot work in time, and the second circuit protection chip U2 detects the power-on condition of the excessive voltage, the second circuit protection chip U2 will start the gate of the third field effect transistor Q3, the current of the external positive electrode P + of the battery pack 100 is conducted to the total negative electrode B through the fuse F1, the fuse F1 is blown out due to the failure to bear the excessive current, and then the charging loop of the battery pack 100 is disconnected, so as to play a role of dual protection.

When the battery cell 2 is at an excessively high temperature, an excessively low temperature, an under-voltage, an over-current or a short circuit, the first circuit protection chip U1 can detect the abnormalities and start the gate of the first field-effect transistor Q4, and disconnect the electrical connection between the total negative electrode B and the external negative electrode P "of the battery pack 100 to disconnect the discharge loop; when the battery pack 100 is short-circuited and the first circuit protection chip U1 fails to operate in time, the fuse F1 is blown in time to protect the battery cell 2.

Referring to fig. 2 and 4, the battery protection circuit is disposed on the circuit board 5, a first insulating sheet 61 is attached between the circuit board 5 and the bottom wall of the mounting groove 15, and a second insulating sheet 62 is attached to a side of the circuit board 5 opposite to the first insulating sheet 61; a third insulating sheet 63 is adhered on the conducting sheet 3 at one end far away from the circuit board 5.

In this embodiment, the first insulating sheet 61 is a double-sided adhesive-coated insulating paper, the second insulating sheet 62 and the third insulating sheet 63 are single-sided adhesive-coated insulating paper, the size and shape of the first insulating sheet 61 and the third insulating sheet 63 match the mounting position, the corresponding conductive sheet 3 can be protected, and the shape and size of the second insulating sheet 62 match the circuit board 5, so that the circuit board 5 can be protected.

Referring to fig. 2 to 4, the sidewall of the mounting groove 15 is provided with a notch 151, the notch 151 is communicated with the corresponding through hole 130, the connection point 51 of the battery protection circuit and the conductive plate 3 is disposed at an edge position of the circuit board 5 opposite to the notch 151, and the conductive plate 3 is connected to the connection point 51 through the notch 151.

In the present embodiment, the conductive sheet 3 includes the connection portion 33 and the extension portion 34, the connection portion 33 is electrically connected to the electrode of the battery cell 2, the extension portion 34 passes through the gap 151 and is electrically connected to the connection point 51 opposite to the gap 151, and the connection point 51 and the gap 151 are arranged to enable components of the battery pack 100 to be more tightly fitted.

Referring to fig. 1 to 4, the present invention discloses an assembling method of a battery pack 100, for assembling the battery pack 100,

the assembling method comprises the following steps:

(1) placing the battery cell 2 on the second bracket 12;

(2) the first bracket 11 is buckled on the second bracket 12;

(3) spot-welding the conductive sheets 3 to both end surfaces of the cell 2 by using a spot-welding jig (not shown);

(4) the first insulating sheet 61 is attached to the bottom wall of the mounting groove 15;

(5) attaching the circuit board 5 to the first insulating sheet 61;

(6) attaching a second insulating sheet 62 to the circuit board 5;

(7) a third insulating sheet 63 is attached to the conductive sheet 3 at an end remote from the circuit board 5.

The first support 11 and the second support 12 for fixing the battery cell 2 are fixedly connected through clamping, the assembly process is simple, the welding of the conducting strip 3 and the battery cell 2 is assisted by a spot welding fixture, the production efficiency of the battery pack 100 is improved, production is carried out by matching with automatic equipment, and automatic assembly of the battery pack 100 is realized. The electric core 2 can be effectively protected by the attached insulating sheet and the circuit board 5, which is beneficial to improving the stability of the battery pack 100.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.

Claims

1. A battery pack, comprising:

the battery comprises four cylindrical battery cells which are closely arranged in a matrix;

a first fixing groove which is sleeved with one end of each of the four battery cells is formed in the inner side of the first support, and a plurality of clamping grooves are formed in the side wall of the first support;

the second support, the second support includes the main part, the inboard of main part is formed with and cup joints four the second fixed slot of electric core, the edge orientation of main part four linking arms, four are extended to first support the linking arm is defined out the electric core accommodation space that the cross-section roughly is the square, four the linking arm corresponds the middle part on each limit of square respectively, the linking arm is including being located the wide part in its outside and being located its inboard narrow part, the free end of narrow part surpasss wide part and outside protruding buckle portion that is equipped with, narrow part is deep adjacent the recess that forms between the cambered surface of electric core, the free end of narrow part stretches into first fixed slot, the buckle portion buckle is in the draw-in groove.

2. The battery according to claim 1, wherein the narrow portion is tapered.

3. The battery pack according to claim 1, wherein end faces of the free ends of the wide portions form step faces, and the side walls of the first holder are supported on the step faces.

4. The battery pack according to claim 1,

the bottom wall of the first fixing groove and the bottom wall of the second fixing groove are respectively provided with a plurality of through holes, conducting strips are respectively arranged at the through holes, and the conducting strips comprise three first conducting strips and two second conducting strips;

5. The battery pack according to claim 4, wherein a mounting groove is formed at one end of the first bracket or the second bracket, the through hole communicates the mounting groove with the first fixing groove or the second fixing groove, the mounting groove is provided with a battery protection circuit electrically connected to the conductive sheet disposed at the same end, and the battery protection circuit is electrically connected to the conductive sheet disposed at one end away from the mounting groove through a conductive wire.

6. The battery pack according to claim 5, wherein the two connecting arms are provided with wire slots penetrating along the extending direction of the connecting arms, and the wire slots are used for accommodating the conductive wires; the installation groove is formed in the first support, a connection hole communicated with the first fixing groove is formed in the bottom wall of the installation groove, the connection hole is opposite to the lead groove, and the conducting wire penetrates through the connection hole and is electrically connected with the battery protection circuit.

7. The battery pack according to claim 5, wherein the battery protection circuit is disposed on a circuit board, a first insulating sheet is attached between the circuit board and the bottom wall of the mounting groove, and a second insulating sheet is attached to a side of the circuit board opposite to the first insulating sheet; keep away from the one end of circuit board the conducting strip facial make-up is equipped with the third insulating piece.

8. The battery pack according to claim 7, wherein a notch is formed in a side wall of the mounting groove, the notch communicates with the corresponding through hole, a connection point of the battery protection circuit and the conductive sheet is formed at an edge of the circuit board facing the notch, and the conductive sheet is connected to the connection point through the notch.