CN216055070U - Battery pack and terminal - Google Patents
Battery pack and terminal Download PDFInfo
- Publication number
- CN216055070U CN216055070U CN202121255838.7U CN202121255838U CN216055070U CN 216055070 U CN216055070 U CN 216055070U CN 202121255838 U CN202121255838 U CN 202121255838U CN 216055070 U CN216055070 U CN 216055070U
- Authority
- CN
- China
- Prior art keywords
- cells
- cell
- battery
- string
- tab
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model relates to a battery pack and a terminal, wherein the battery pack comprises a circuit board, a plurality of connecting pieces, a first string of battery cells and a second string of battery cells, the first string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the first string of battery cells and are mutually connected in series, the second string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the second string of battery cells and are mutually connected in series, and the first string of battery cells and the second string of battery cells are connected in parallel through the connecting pieces and the circuit board. The utility model provides a group battery for the group battery of establishing ties after the parallelly connected earlier of prior art, can reduce the length and the use amount of connection piece, reduce the internal resistance of group battery, reduce calorific capacity of battery during operation, increase the effective energy of battery during operation, reduce the cost of group battery, the security when increasing the battery inefficacy.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a battery pack and a terminal.
Background
The development of electronic technology and 5G, mobile terminals are increasingly demanded and applied, and the mobile terminals inevitably need to be equipped with batteries. Due to the increasing number of applications, there is an increasing demand for fast-charging batteries with high capacity, low loss and low cost. For example, in order to achieve the use voltage of a battery of a notebook computer, a battery pack of a part of existing notebook computers generally consists of a plurality of cells connected in series and in parallel, and in order to meet the requirement of high electric capacity, each battery in series is generally connected with 2-3 cells in parallel; and a Battery Management System (BMS) is generally provided for the Battery pack to manage the Battery cells.
In the industry, the battery pack generally adopts a connection mode of firstly connecting in parallel and then connecting in series. Meanwhile, the notebook computer is developing towards light weight, and the thinner the product is, the thinner the corresponding parts are also required to be. The battery pack is used as one part, and the thickness of the battery pack is correspondingly limited. The arrangement of the battery pack, which is also limited, is generally arranged in line in the width or length direction, while the arrangement in the thickness direction has been gradually abandoned due to the occupation of an expensive size space, taking the arrangement in line in the width direction as a main arrangement. When the cells are arranged in series in the width direction of the cells in the industry, the cells are generally connected in a series-parallel mode. The connection between the cell groups is realized by the back and forth and reciprocating of the PCB (Printed Circuit Board) wiring; the other type is that BMS length is far less than the width of arranging of group battery, and the connection between the electric core of its group battery passes through the connection piece to be connected, because electric core arranges for the width direction in-line, and just, the negative pole position of electric core is the same, and the connection piece all need stride across the parallelly connected of electric core width realization battery, and the group battery spatial arrangement is complicated, and the connection piece is longer. In order to prevent the short circuit of the battery, the PI double-sided pressing is generally used on the connecting sheet, the cost is high, the cost of the battery is high, meanwhile, the length of a battery loop is increased, the impedance of the battery pack is increased, and the capacity of the battery cannot be discharged.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: to the problem that the existing battery pack is long in connecting piece, a battery pack and a terminal are provided.
In order to solve the foregoing technical problem, in one aspect, an embodiment of the present invention provides a battery pack, which includes a circuit board, a plurality of connection pads, a first string of battery cells, and a second string of battery cells, where the first string of battery cells includes a plurality of battery cells that are arranged in line in a width direction of the first string of battery cells and are connected in series with each other, the second string of battery cells includes a plurality of battery cells that are arranged in line in a width direction of the second string of battery cells and are connected in series with each other, and the first string of battery cells and the second string of battery cells are connected in parallel through the plurality of connection pads and the circuit board.
Optionally, the plurality of cells of the first string of cells and the plurality of cells of the second string of cells are arranged in the same column;
the positive electrode tabs of the plurality of cells of the first string of cells are closer to the second string of cells than the negative electrode tabs of the plurality of cells of the first string of cells in the cell width direction, and the positive electrode tabs of the plurality of cells of the second string of cells are closer to the first string of cells than the negative electrode tabs of the plurality of cells of the second string of cells in the cell width direction.
Optionally, the multiple battery cells of the first string of battery cells are sequentially numbered as 1, … …, n toward a direction close to the second string of battery cells, and the multiple battery cells of the second string of battery cells are sequentially numbered as n +1, … …, m toward a direction away from the first string of battery cells; n is an integer greater than or equal to 2, and the n cell is adjacent to the n +1 cell;
the number of the cells in the first string of cells is equal to the number of the cells in the second string of cells, that is, m is 2 n; the positive tab of the No. 1 battery cell is connected with the negative tab of the No. 2 battery cell through a connecting sheet, and the positive tab of the No. m battery cell is connected with the negative tab of the No. m-1 battery cell through a connecting sheet.
Optionally, when n is greater than or equal to 3, in the multiple battery cells of the first string of battery cells except for the battery cell No. 1, two adjacent battery cells are connected in series through the metal wire on the circuit board, and in the multiple battery cells of the second string of battery cells except for the battery cell No. m, two adjacent battery cells are connected in series through the metal wire on the circuit board.
Optionally, a connecting wire, a sampling wire and a battery management chip are arranged on the circuit board, a negative electrode tab of the n-number battery cell and a negative electrode tab of the n + 1-number battery cell are connected to the circuit board, the connecting wire is connected with the negative electrode tab of the n-number battery cell and the negative electrode tab of the n + 1-number battery cell, one end of the sampling wire is connected to the potential middle position of the connecting wire, and the other end of the sampling wire is connected with a signal sampling end of the battery management chip;
the width of the connecting line is 0.3-2mm, and the width of the sampling line is 0.07-1 mm.
Optionally, a positive electrode main connecting line is arranged on the circuit board, the positive electrode tab of the n-number cell and the positive electrode tab of the n + 1-number cell are connected to the circuit board, and the positive electrode main connecting line is connected with the positive electrode tab of the n-number cell and the positive electrode tab of the n + 1-number cell;
the circuit board is provided with a negative electrode main connecting wire, the negative electrode ear of the No. 1 battery cell is connected to one end of the negative electrode main connecting wire through a connecting sheet, and the negative electrode ear of the No. m battery cell is connected to the other end of the negative electrode main connecting wire through a connecting sheet;
the overcurrent capacity of the positive main connecting wire and the negative main connecting wire is greater than or equal to 50% of the maximum working current of the battery pack.
Optionally, the spacing between the positive tab and the negative tab of each battery cell is the same;
the distance between the positive lug of the battery cell and the top edge of the battery cell is the sum of the unilateral glue sealing width of the positive lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of a pole piece;
the distance between the negative electrode lug of the battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the negative electrode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
Optionally, a positive electrode tab of a first cell of the first string of cells is disposed close to a negative electrode tab of the first cell of the first string of cells, and a positive electrode tab of a last cell of the second string of cells is disposed close to a negative electrode tab of the last cell of the second string of cells;
the distance between the positive electrode tab and the negative electrode tab of the first battery cell of the first string of battery cells is the sum of the unilateral sealant width of the positive electrode tab, the unilateral sealant width of the negative electrode tab and the cutting and welding precision of the pole piece; the distance between the positive electrode tab and the negative electrode tab of the last battery cell of the second string of battery cells is the sum of the unilateral glue sealing width of the positive electrode tab, the unilateral glue sealing width of the negative electrode tab and the cutting and welding precision of the pole piece;
the cell between the first cell of the first string of cells and the last cell of the second string of cells is defined as a middle cell, and the distance between the positive electrode lug of the middle cell and the top edge of the cell is the sum of the unilateral glue sealing width of the positive electrode lug, the edge arc radius of the winding thickness of the cell, the edge sealing tolerance of the cell and the cutting and welding precision of a pole piece; the distance between the cathode lug of the middle battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the cathode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
Optionally, a protection device is connected in series between the positive tab or the negative tab of the battery cell and the connecting piece, and one end of the protection device connected with the connecting piece is arranged close to the top edge of the battery cell.
According to the battery pack provided by the embodiment of the utility model, the first string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the battery cells and are connected in series, the second string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the battery cells and are connected in series, and the first string of battery cells and the second string of battery cells are connected in parallel through a plurality of connecting sheets and a circuit board. Therefore, compared with the battery pack which is connected in parallel and then connected in series in the prior art, the length and the usage amount of the connecting sheet can be reduced, the internal resistance of the battery pack can be reduced, the heat productivity of the battery during working can be reduced, the effective energy of the battery during working can be increased, the cost of the battery pack can be reduced, and the safety of the battery during failure can be improved.
In another aspect, an embodiment of the present invention provides a terminal, including the battery pack described above.
Drawings
Fig. 1 is a schematic view of a battery pack provided in a first embodiment of the present invention;
fig. 2 is a schematic view of a current path of a battery pack according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a battery pack according to an embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a circuit board; 11. a connecting wire; 12. sampling lines; 13. a battery management chip; 14. a positive main connection line; 15. a negative main connecting line;
2. and (7) connecting the sheets.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The battery pack provided by the embodiment of the utility model comprises a circuit board, a plurality of connecting pieces, a first string of battery cells and a second string of battery cells, wherein the first string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the first string of battery cells and are mutually connected in series, the second string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the second string of battery cells and are mutually connected in series, and the first string of battery cells and the second string of battery cells are connected in parallel through the plurality of connecting pieces and the circuit board.
In some embodiments, the plurality of cells of the first string of cells and the plurality of cells of the second string of cells are arranged in the same column; the positive electrode tabs of the plurality of cells of the first string of cells are closer to the second string of cells than the negative electrode tabs of the plurality of cells of the first string of cells in the cell width direction, and the positive electrode tabs of the plurality of cells of the second string of cells are closer to the first string of cells than the negative electrode tabs of the plurality of cells of the second string of cells in the cell width direction.
In some embodiments, the cells of the first string of cells are sequentially numbered as 1, … …, n toward a direction close to the second string of cells, and the cells of the second string of cells are sequentially numbered as n +1, … …, m toward a direction away from the first string of cells; and n is an integer greater than or equal to 2, and the n cell is adjacent to the n +1 cell.
In some embodiments, the number of cells in the first string is equal to the number of cells in the second string, i.e., m — 2 n; the positive tab of the No. 1 battery cell is connected with the negative tab of the No. 2 battery cell through a connecting sheet, and the positive tab of the No. m battery cell is connected with the negative tab of the No. m-1 battery cell through a connecting sheet.
In some embodiments, n is 2, 3, or 4.
In some embodiments, when n is greater than or equal to 3, two adjacent battery cells in the plurality of battery cells of the first string of battery cells except for the battery cell No. 1 are connected in series through the metal trace on the circuit board, and two adjacent battery cells in the plurality of battery cells of the second string of battery cells except for the battery cell No. m are connected in series through the metal trace on the circuit board.
In some embodiments, a connection line, a sampling line and a battery management chip are arranged on the circuit board, a negative electrode tab of the n-number battery cell and a negative electrode tab of the n + 1-number battery cell are connected to the circuit board, the connection line connects the negative electrode tab of the n-number battery cell and the negative electrode tab of the n + 1-number battery cell, one end of the sampling line is connected to a potential middle position of the connection line, and the other end of the sampling line is connected to a signal sampling end of the battery management chip; the width of the connecting line is 0.3-1mm, and the width of the sampling line is 0.07-1 mm.
In some embodiments, a positive electrode main connecting line is arranged on the circuit board, a positive electrode tab of the n-number cell and a positive electrode tab of the n + 1-number cell are connected to the circuit board, and the positive electrode main connecting line is connected with the positive electrode tab of the n-number cell and the positive electrode tab of the n + 1-number cell; the circuit board is provided with a negative electrode main connecting wire, the negative electrode ear of the No. 1 battery cell is connected to one end of the negative electrode main connecting wire through a connecting sheet, and the negative electrode ear of the No. m battery cell is connected to the other end of the negative electrode main connecting wire through a connecting sheet; the overcurrent capacity of the positive main connecting wire and the negative main connecting wire is greater than or equal to 50% of the maximum working current of the battery pack.
In some embodiments, the positive tab and the negative tab of each cell have the same spacing; the distance between the positive lug of the battery cell and the top edge of the battery cell is the sum of the unilateral glue sealing width of the positive lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of a pole piece; the distance between the negative electrode lug of the battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the negative electrode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
In some embodiments, the positive tab of the first cell of the first string of cells is disposed adjacent to the negative tab of the first cell of the first string of cells, and the positive tab of the last cell of the second string of cells is disposed adjacent to the negative tab of the last cell of the second string of cells; the distance between the positive electrode tab and the negative electrode tab of the first battery cell of the first string of battery cells is the sum of the unilateral sealant width of the positive electrode tab, the unilateral sealant width of the negative electrode tab and the cutting and welding precision of the pole piece; the distance between the positive electrode tab and the negative electrode tab of the last battery cell of the second string of battery cells is the sum of the unilateral glue sealing width of the positive electrode tab, the unilateral glue sealing width of the negative electrode tab and the cutting and welding precision of the pole piece; the cell between the first cell of the first string of cells and the last cell of the second string of cells is defined as a middle cell, and the distance between the positive electrode lug of the middle cell and the top edge of the cell is the sum of the unilateral glue sealing width of the positive electrode lug, the edge arc radius of the winding thickness of the cell, the edge sealing tolerance of the cell and the cutting and welding precision of a pole piece; the distance between the cathode lug of the middle battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the cathode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
In some embodiments, a protection device is connected in series between the positive tab or the negative tab of the cell and the connecting piece, and one end of the protection device connected with the connecting piece is arranged near the top edge of the cell.
According to the battery pack provided by the embodiment of the utility model, the first string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the battery cells and are connected in series, the second string of battery cells comprises a plurality of battery cells which are arranged in line along the width direction of the battery cells and are connected in series, and the first string of battery cells and the second string of battery cells are connected in parallel through a plurality of connecting sheets and a circuit board. Therefore, compared with the battery pack which is connected in parallel and then connected in series in the prior art, the length and the usage amount of the connecting sheet can be reduced, the internal resistance of the battery pack can be reduced, the heat productivity of the battery during working can be reduced, the effective energy of the battery during working can be increased, the cost of the battery pack can be reduced, and the safety of the battery during failure can be improved.
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
First embodiment
Referring to fig. 1 to 3, a battery pack according to a first embodiment of the present invention includes a circuit board 1, a plurality of connecting tabs 2, a first battery cell BC1, and a second battery cell BC2, where the first battery cell BC1 includes two battery cells arranged in line in a width direction thereof and connected in series with each other, the second battery cell BC2 includes two battery cells arranged in line in a width direction thereof and connected in series with each other, and the first battery cell BC1 and the second battery cell BC2 are connected in parallel through the plurality of connecting tabs 2 and the circuit board 1.
The two battery cells of the first string of battery cells BC1 and the two battery cells of the second string of battery cells BC2 are arranged in the same column. In this way, all the cells of the battery pack are arranged in line in the width direction thereof.
Positive electrode tabs of two cells of the first string of cells BC1 are closer to the second string of cells BC2 than negative electrode tabs thereof are in the cell width direction, and positive electrode tabs of a plurality of cells of the second string of cells BC2 are closer to the first string of cells BC1 than negative electrode tabs thereof are in the cell width direction.
The two cells of the first string of cells BC1 are numbered 1 and 2 in sequence in the direction approaching the second string of cells BC2 (hereinafter, cell No. 1 and cell No. 2 are denoted by B1 and B2, respectively), and the two cells of the second string of cells BC2 are numbered 3 and 4 in sequence in the direction departing from the first string of cells BC1 (hereinafter, cell No. 3 and cell No. 4 are denoted by B3 and B4, respectively). That is, in the first embodiment, n is 2 and m is 4. Cell B2 No. 2 is adjacent to cell B3 No. 3.
The number of the cells of the first string of cells BC1 is equal to that of the cells of the second string of cells BC2, so that the voltages and currents of the first string of cells BC1 and the second string of cells BC2 are the same when the cells of the same type are adopted. Moreover, the symmetrical design facilitates voltage sampling.
In this embodiment, the battery cell is a soft-package battery cell. For convenience of description, the positive and negative tabs of cell B1 No. 1 are denoted by B1+ and B1-, respectively, the positive and negative tabs of cell B2 No. 2 are denoted by B2+ and B2-, respectively, the positive and negative tabs of cell B3 No. 3 are denoted by B3+ and B3-, respectively, and the positive and negative tabs of cell B4 No. 4 are denoted by B4+ and B4-, respectively.
In addition, for convenience of description, 4 connection pieces 2 are denoted by 2a, 2b, 2c, and 2d in order from left to right in fig. 2.
In this embodiment, the positive tab B1+ of the cell B1 No. 1 is connected to the negative tab B2-of the cell B2 No. 2 through the connecting piece 2B; the positive tab B4+ of the cell B4 No. 4 is connected with the negative tab B3-of the cell B3 No. 3 through a connecting piece 2 c.
The circuit board 1 is provided with a connecting wire 11, a sampling wire 12 and a battery management chip 13, and the negative electrode tab B2 of the No. 2 cell B2-and the negative electrode tab B3 of the No. 3 cell B3-are connected to the circuit board 1 (for example, soldered to corresponding solder pads). That is, the negative tab B2 of the No. 2 cell B2 is connected to the circuit board 1, and provides the voltage signals of the No. 1 cell B1 and the No. 2 cell B2 for the BMS. And the negative electrode tab B3-of the No. 3 battery cell B3 is connected to the circuit board 1 to provide voltage signals of the No. 3 battery cell B1 and the No. 4 battery cell B2 for the BMS. The connecting wire 11 is connected with the negative electrode tab B2-of the No. 2 battery cell and the negative electrode tab B3-of the No. 3 battery cell B3, one end of the sampling wire 12 is connected with the electrical middle position of the connecting wire 11, and the other end of the sampling wire 12 is connected with the battery management chip 13.
The negative electrode tab B2-of the cell B2 No. 2 and the negative electrode tab B3-of the cell B3 No. 3 are connected to the same pole of the circuit board 1, and are used as intermediate pole signals input to the first string of cells BC1 and the second string of cells BC 2. A common voltage output end serving as a first string of electric cores of the battery pack; the connecting line between the cathode lugs of the battery cell 2 and the battery cell 3 needs to be stronger than other signal lines in the BMS, and is used as a flow path when each battery cell in the battery cell group is unbalanced in charging and discharging, or as a balance path between the parallel battery cells when each series of battery cell groups are unbalanced in static state; the set overcurrent capacity is related to the unbalance degree of the electric core group.
The connecting wire 11 needs to be stronger than other signal lines on the circuit board 1, and the signal line width generally sets up in 0.1 ~ 0.2mm in the trade, and the limit sets up about 0.05 mm. In this embodiment, since the connection line 11 needs to flow a certain current, the width of the connection line 11 is set to be 0.3 to 2 mm. The width of the sampling line 12 is smaller than the width of the connection line 11 in conventional signal sampling designs, typically 0.07-1 mm.
The circuit board 1 is provided with a positive main connecting wire 14, the positive tab B2+ of the No. 2 cell B2 and the positive tab B3+ of the No. 3 cell B3 are connected to the circuit board 1 (for example, soldered to corresponding pads), and the positive main connecting wire 14 is connected to the positive tab B2+ of the No. 2 cell B2 and the positive tab B3+ of the No. 3 cell B3. The positive main connecting wire 14 is a part of the main working circuit, and needs to satisfy the overcurrent capacity of more than 50% of the maximum working current of the electric core assembly (the overcurrent capacity of the positive main connecting wire 14 is more than or equal to 50% of the maximum working current of the battery pack), and is generally more than 70% of the maximum working current of the electric core assembly. The positive main connecting wire 14 has a large overcurrent capacity, so that the main working circuit is prevented from being broken due to damage caused by excessive current.
The circuit board 1 is provided with a negative electrode main connecting wire 15, the negative electrode tab B1 of the cell No. 1B 1 is connected to one end of the negative electrode main connecting wire 15 through a connecting sheet 2a, and the negative electrode tab B4 of the cell No. 4B 4 is connected to the other end of the negative electrode main connecting wire 15 through a connecting sheet 2 d. The negative main connecting line 15, which is a part of the main operating circuit, needs to satisfy the overcurrent capacity of more than 50% of the maximum operating current of the electric core assembly (the overcurrent capacity of the negative main connecting line 15 is greater than or equal to 50% of the maximum operating current of the battery pack), and is generally more than 70% of the maximum operating current of the electric core assembly. The overcurrent capacity of the cathode main connecting wire 15 is high, and the disconnection of a main working circuit caused by damage when the current is too high is avoided.
In this embodiment, each battery cell has the same structure and size, and the distance between the positive electrode tab and the negative electrode tab of each battery cell is the same. The positive lug of electricity core is close to the top edge of electricity core, the distance at the positive lug of electricity core and the top edge of electricity core is the unilateral marginal arc radius of gluing width, electric core coiling thickness of positive lug, electric core banding tolerance and the sum of pole piece cutting welding precision. The cathode ear of the battery cell is close to the top edge of the battery cell, and the distance between the cathode ear of the battery cell and the top edge of the battery cell is the sum of the unilateral glue sealing width of the cathode ear, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
The positive pole ear and the negative pole ear of the battery cell are arranged close to the edge of the output side edge of the pole ear of the battery cell as much as possible, so that the length size of the connecting piece 2 is further reduced, and the using amount is reduced.
According to the battery pack of the first embodiment of the utility model, the two battery cells B1 and B2 of the first string of battery cells are connected in series through the connecting piece 2B, the connecting piece 2B does not need to span the width direction of the battery cells, and the length of the connecting piece 2B is reduced by the distance between the two tabs. Similarly, the length of the connecting piece 2c is reduced to reduce the distance between the two tabs. This reduces the length and the amount of use of the tab 2, and reduces the cost of the battery pack.
In addition, the connection tab is generally a film-coated connection tab with a surface film (insulating film), and the reduction of the film-coated connection tab reduces the loop impedance of the battery pack, thereby reducing the energy loss of the battery pack.
Generally, the loop impedance is large, a voltage drop is generated when current flows through the loop impedance, and the voltage detected by the charger is the sum of the actual voltage of the battery cell and the voltage of the loop impedance; during charging, the actual voltage of the battery cell is smaller than the detection voltage of the charger, and the battery cell cannot be fully charged; when discharging, the actual voltage of the battery core is larger than the detection voltage of the electric appliance, and the electric quantity of the battery core cannot be released. Meanwhile, when discharging, the ohmic loss generated by the increase of the loop impedance is inevitable in the prior art. Thus, the present embodiment reduces the loop impedance of the battery pack by reducing the amount of the film connection tabs, enables the battery pack to be fully charged and fully discharged, reduces the loss of energy during discharge, reduces the energy loss during charging, and fully develops the potential of the battery. Meanwhile, the influence of short circuit of other parallel-connected related batteries caused by short circuit failure of one battery when a plurality of battery packs are connected in parallel is solved;
second embodiment
The second embodiment is different from the first embodiment in that a protection device is connected in series between the positive electrode tab or the negative electrode tab of the battery cell and the connecting sheet, and one end of the protection device connected with the connecting sheet 2 is arranged close to the top edge of the battery cell. The distance between the lug of the battery cell and the top edge of the battery cell is the sum of the unilateral glue sealing width of the lug, the size of a protection device, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
The protection device may be, for example, a recoverable breaker, a fuse box, or the like. The body part of the protection device is arranged at the sealing step of the battery cell. One end of the protection device is provided with a lead-out piece connected with the connecting piece 2, and the lead-out piece extends out of the top edge of the battery core.
And by adding the protection device, when the battery cell is out of control due to heat, the battery cell is disconnected from other battery cells, so that the battery pack is prevented from being ignited and exploded.
Third embodiment
The third embodiment is different from the first embodiment in that a positive electrode tab of a first cell (cell No. 1) of the first string of cells is disposed close to a negative electrode tab of the first cell of the first string of cells, and a positive electrode tab of a last cell (cell No. 4) of the second string of cells is disposed close to a negative electrode tab of the last cell of the second string of cells. The distance between the positive electrode tab and the negative electrode tab of the first battery cell of the first string of battery cells is the sum of the positive electrode tab single-side sealing glue width, the negative electrode tab single-side glue width and the pole piece cutting and welding precision; and the distance between the positive electrode tab and the negative electrode tab of the last battery cell of the second battery cell string is the sum of the unilateral glue sealing width of the positive electrode tab, the unilateral glue sealing width of the negative electrode tab and the cutting and welding precision of the pole piece.
The first electric core of the first string of electric core and electric core (No. 2 electric core and No. 3 electric core) between the last electric core of the second string of electric core are defined as middle electric core, the distance between the positive lug of middle electric core and the top edge of electric core is the sum of the unilateral glue sealing width of the positive lug, the edge circular arc radius of the winding thickness of electric core, the edge sealing tolerance of electric core and the cutting and welding precision of pole piece.
The distance between the cathode lug of the middle battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the cathode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
In a third embodiment, the positive tab of the first cell (cell No. 1) of the first string of cells is disposed close to the negative tab, and the positive tab of the last cell (cell No. 4) of the second string of cells is disposed close to the negative tab. Therefore, the length of the connecting sheet for connecting the negative electrode lug of the No. 1 battery cell and the circuit board can be reduced. In the same way, the length of the connecting piece for connecting the negative pole lug of the No. 4 battery cell and the circuit board can be reduced.
In addition, an embodiment of the present invention provides a terminal including the battery pack of the above embodiment.
The terminal can be a notebook computer, a tablet computer, a mobile phone and the like. The terminal has all the advantages of the battery pack described above.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a battery pack, its characterized in that includes circuit board, a plurality of connection piece, first cluster electric core and second cluster electric core, first cluster electric core includes a plurality of electric cores of arranging and establishing ties each other along its width direction in-line, second cluster electric core includes a plurality of electric cores of arranging and establishing ties each other along its width direction in-line, first cluster electric core with second cluster electric core realizes connecting in parallel through a plurality of connection piece and circuit board.
2. The battery pack of claim 1, wherein the plurality of cells of the first string of cells are arranged in a same column as the plurality of cells of the second string of cells;
the positive electrode tabs of the plurality of cells of the first string of cells are closer to the second string of cells than the negative electrode tabs of the plurality of cells of the first string of cells in the cell width direction, and the positive electrode tabs of the plurality of cells of the second string of cells are closer to the first string of cells than the negative electrode tabs of the plurality of cells of the second string of cells in the cell width direction.
3. The battery pack of claim 2, wherein the cells of the first string of cells are numbered 1, … …, n in sequence toward the second string of cells, and the cells of the second string of cells are numbered n +1, … …, m in sequence away from the first string of cells; n is an integer greater than or equal to 2, and the n cell is adjacent to the n +1 cell;
the number of the cells in the first string of cells is equal to the number of the cells in the second string of cells, that is, m is 2 n; the positive tab of the No. 1 battery cell is connected with the negative tab of the No. 2 battery cell through a connecting sheet, and the positive tab of the No. m battery cell is connected with the negative tab of the No. m-1 battery cell through a connecting sheet.
4. The battery pack of claim 3, wherein when n is greater than or equal to 3, two adjacent cells in the plurality of cells of the first string of cells except for cell No. 1 are connected in series through the metal traces on the circuit board, and two adjacent cells in the plurality of cells of the second string of cells except for cell No. m are connected in series through the metal traces on the circuit board.
5. The battery pack according to claim 3, wherein a connecting wire, a sampling wire and a battery management chip are arranged on the circuit board, the negative electrode tab of the n-number battery cell and the negative electrode tab of the n + 1-number battery cell are connected to the circuit board, the connecting wire is connected with the negative electrode tab of the n-number battery cell and the negative electrode tab of the n + 1-number battery cell, one end of the sampling wire is connected to the potential middle position of the connecting wire, and the other end of the sampling wire is connected with a signal sampling end of the battery management chip;
the width of the connecting line is 0.3-2mm, and the width of the sampling line is 0.07-1 mm.
6. The battery pack according to claim 3, wherein a positive main connecting line is arranged on the circuit board, the positive tab of the n-cell and the positive tab of the n + 1-cell are connected to the circuit board, and the positive main connecting line is connected with the positive tab of the n-cell and the positive tab of the n + 1-cell;
the circuit board is provided with a negative electrode main connecting wire, the negative electrode ear of the No. 1 battery cell is connected to one end of the negative electrode main connecting wire through a connecting sheet, and the negative electrode ear of the No. m battery cell is connected to the other end of the negative electrode main connecting wire through a connecting sheet;
the overcurrent capacity of the positive main connecting wire and the negative main connecting wire is greater than or equal to 50% of the maximum working current of the battery pack.
7. The battery pack according to claim 1, wherein the positive tab and the negative tab of each cell are spaced at the same distance;
the distance between the positive lug of the battery cell and the top edge of the battery cell is the sum of the unilateral glue sealing width of the positive lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of a pole piece;
the distance between the negative electrode lug of the battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the negative electrode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
8. The battery pack of claim 1, wherein the positive tab of the first cell of the first string of cells is disposed proximate to the negative tab of the first cell of the first string of cells, and the positive tab of the last cell of the second string of cells is disposed proximate to the negative tab of the last cell of the second string of cells;
the distance between the positive electrode tab and the negative electrode tab of the first battery cell of the first string of battery cells is the sum of the unilateral sealant width of the positive electrode tab, the unilateral sealant width of the negative electrode tab and the cutting and welding precision of the pole piece; the distance between the positive electrode tab and the negative electrode tab of the last battery cell of the second string of battery cells is the sum of the unilateral glue sealing width of the positive electrode tab, the unilateral glue sealing width of the negative electrode tab and the cutting and welding precision of the pole piece;
the cell between the first cell of the first string of cells and the last cell of the second string of cells is defined as a middle cell, and the distance between the positive electrode lug of the middle cell and the top edge of the cell is the sum of the unilateral glue sealing width of the positive electrode lug, the edge arc radius of the winding thickness of the cell, the edge sealing tolerance of the cell and the cutting and welding precision of a pole piece; the distance between the cathode lug of the middle battery cell and the top edge of the battery cell is the sum of the unilateral sealing glue width of the cathode lug, the edge arc radius of the winding thickness of the battery cell, the edge sealing tolerance of the battery cell and the cutting and welding precision of the pole piece.
9. The battery pack according to claim 1, wherein a protection device is connected in series between the positive electrode tab or the negative electrode tab of the cell and the connecting sheet, and one end of the protection device connected with the connecting sheet is arranged close to the top edge of the cell.
10. A terminal, characterized in that it comprises a battery pack according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255838.7U CN216055070U (en) | 2021-06-04 | 2021-06-04 | Battery pack and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121255838.7U CN216055070U (en) | 2021-06-04 | 2021-06-04 | Battery pack and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216055070U true CN216055070U (en) | 2022-03-15 |
Family
ID=80614695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121255838.7U Active CN216055070U (en) | 2021-06-04 | 2021-06-04 | Battery pack and terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216055070U (en) |
-
2021
- 2021-06-04 CN CN202121255838.7U patent/CN216055070U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2797140B1 (en) | Battery pack having novel structure | |
| CN207530023U (en) | A kind of battery and mobile terminal | |
| CN211789255U (en) | Battery pack | |
| CN112133876B (en) | Battery and terminal equipment | |
| CN104916805A (en) | Battery pack | |
| EP4064505A1 (en) | Terminal device | |
| WO2021129492A1 (en) | Battery assembly for use in terminal device, and terminal device having same | |
| US20110027622A1 (en) | Battery pack and method of manufacturing battery pack | |
| CN207250574U (en) | Battery and mobile terminal | |
| CN111969168B (en) | Battery pack and electronic device | |
| CN203150647U (en) | Connection structure of pole lug of lithium ion battery pack | |
| CN113036315A (en) | Battery and terminal equipment | |
| CN109616608A (en) | Battery, electronic equipment and battery pack | |
| CN216055070U (en) | Battery pack and terminal | |
| WO2021179216A1 (en) | Battery cell structure and battery | |
| US20100244772A1 (en) | Battery module | |
| CN215989112U (en) | Battery pack and electronic device | |
| CN217720781U (en) | Plate connection structure of active equalization circuit with battery protection and thermal protection | |
| CN212751068U (en) | Electricity core mixes parallelly connected battery | |
| CN213071296U (en) | Multi-fold U-shaped buffer device for connecting battery cells | |
| CN113314806B (en) | Composite battery and electronic device | |
| CN213366741U (en) | Battery with a battery cell | |
| CN215451698U (en) | Battery device and electric equipment | |
| CN213782210U (en) | Battery pack assembly, battery and terminal equipment | |
| CN218101641U (en) | Charging shunting device of quick-charging battery, quick-charging battery and terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |