Battery pack

Abstract

The utility model relates to a battery pack. The battery pack includes: a case member; the battery pack consists of a plurality of battery cells; the electric connection component is respectively contacted with each battery cell to establish electric connection among different battery cells in the battery pack; the battery management assembly is electrically connected with the battery pack through the electric connection assembly; the electric connection assembly comprises a flexible printed circuit board and a plurality of nickel sheets, wherein the flexible printed circuit board forms a current conduction path; one part of the nickel sheet is in contact with the battery cell, and the other part of the nickel sheet is fixedly mounted on the flexible printed circuit board. The electric connection assembly formed by the flexible printed circuit board and the nickel sheet attached to the flexible printed circuit board is used for replacing a traditional cable, and therefore a series of problems caused in the tin soldering process of the traditional cable and the nickel sheet can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, and particularly relates to a battery pack. Background Art

[0002] A battery pack is an energy storage device capable of storing electrical energy in the form of chemical energy. It is widely used as a portable power source for many devices.

[0003] Among existing battery packs, the battery management component and the battery cells are usually connected through wires and nickel sheets by soldering. Since the wires and nickel sheets generate high temperatures during the soldering process, a huge hidden danger is posed to the safety and reliability of the battery cells. In addition, there are risks of false soldering and detachment during the soldering process, resulting in poor consistency and reliability of the battery pack in use.

[0004] During the production and manufacturing process of the battery pack, manual operations of straightening and fixing the wires and nickel sheets are also required. Such manual operations are prone to generating a floating height phenomenon, which has an adverse impact on the overall thickness of the device.

[0005] In addition, in order to meet the diverse functional requirements of the battery management component (such as voltage sampling, temperature sampling, and power output), a large number of wires and corresponding auxiliary materials are usually required. As a result, the material production cost of the battery pack is further increased, and the reliability of the battery pack in use is reduced. Summary of the Utility Model

[0006] The battery pack provided in this application aims to solve at least some of the defects caused by using wires and nickel sheets to achieve electrical connection inside the battery pack in existing battery packs.

[0007] An embodiment of the utility model provides a battery pack. The battery pack includes: a housing component; a battery pack composed of a plurality of battery cells; the battery pack is received and fixed inside the housing component; an electrical connection component; the electrical connection component is in contact with each battery cell respectively to establish electrical connection between different battery cells in the battery pack; a battery management component; the battery management component is electrically connected to the battery pack through the electrical connection component; wherein, the electrical connection component includes: a flexible printed circuit board forming a current conduction path; a plurality of nickel sheets; a part of the area of the nickel sheet is in contact with the battery cell, and another part of the area of the nickel sheet is mounted and fixed on the flexible printed circuit board to enable the battery cell to establish electrical connection with the current conduction path.

[0008] In some embodiments, the battery pack includes: at least two series-connected cell groups; each of the series-connected cell groups is composed of at least two parallel-connected cell groups; wherein, each of the parallel-connected cell groups is composed of at least two cells; at least two cells constituting the parallel-connected cell group have the same polarity on the same side; and at least two parallel-connected cell groups constituting the series-connected cell group have opposite polarities on the same side.

[0009] In some embodiments, the parallel-connected cell group has a first polarity end and a second polarity end located on opposite sides; wherein, the nickel sheet includes: at least one current-collecting nickel sheet, at least two first electrode nickel sheets, and at least two second electrode nickel sheets; the first polarity end and the second polarity end of each parallel-connected cell group are respectively welded and fixed to a first electrode nickel sheet and a second electrode nickel sheet; or the first polarity end and the second polarity end of each parallel-connected cell group are respectively welded and fixed to a current-collecting nickel sheet and a second electrode nickel sheet.

[0010] In some embodiments, the flexible printed circuit board includes: a first end portion, a second end portion, a nickel sheet embedding portion, and a plurality of connecting portions; wherein, the first end portion, the second end portion, and the nickel sheet embedding portion are connected by the plurality of connecting portions; the nickel sheet embedding portion is located between the first end portion and the second end portion, and the nickel sheet is mounted and fixed on the first end portion and the second end portion.

[0011] In some embodiments, the battery pack further includes: a plurality of thermistor patches and a plurality of insulating layers; wherein, the thermistor patches are attached to the surface of the cells and are electrically connected to the connecting portions to form an electrical signal for reflecting the temperature information of the cells; the insulating layers are provided between two adjacent series-connected cell groups to form an insulating isolation.

[0012] In some embodiments, the first end portion includes: a first substrate; the first substrate is provided with a plurality of first through holes, so that the nickel sheet mounted and fixed on the first substrate passes through the first through holes and is welded and fixed to the cells; a first output terminal; the first output terminal is the positive output terminal of the current conduction path and is provided on the first substrate; a second output terminal; the second output terminal is the negative output terminal of the current conduction path and is provided on the first substrate, and is away from the first output terminal; wherein, the battery management component is electrically connected to the first output terminal and the second output terminal in a plug-in connection manner.

[0013] In some embodiments, the second end portion includes: a second substrate; wherein, a plurality of second through-holes are formed in the second substrate, so that the nickel sheets mounted and fixed on the second substrate are welded and fixed to the battery cell through the second through-holes; the nickel sheet embedding portion includes: a third substrate, a fourth substrate and a bending arm; wherein, the third substrate is connected to the fourth substrate through the bending arm; a plurality of third through-holes are formed in the third substrate, and a plurality of fourth through-holes are formed in the fourth substrate.

[0014] In some embodiments, the first electrode nickel sheet includes: at least one first conduction sheet, at least two first gaskets and at least two first electrode elastic sheets; wherein, at least one of the first conduction sheets and at least two of the first gaskets are both mounted and fixed on the first substrate; the first electrode elastic sheet protrudes from the surface of the first gasket and abuts against the positive or negative electrode of the battery cell through the first through-hole; two of the first gaskets are connected by one of the first conduction sheets, and a plurality of first ventilation holes are formed in the first gasket.

[0015] In some embodiments, the busbar nickel sheet includes: a plurality of second conduction sheets, a plurality of second gaskets and a plurality of second electrode elastic sheets; wherein, a plurality of the second conduction sheets and a plurality of the second gaskets are both mounted and fixed on the second substrate; the second electrode elastic sheet protrudes from the surface of the second gasket and abuts against the positive or negative electrode of the battery cell through the second through-hole; any two of the second gaskets are connected by one of the second conduction sheets, and a plurality of second ventilation holes are formed in the second gasket.

[0016] In some embodiments, the second electrode nickel sheet includes: a first abutting portion, a second abutting portion, and a bending portion; wherein, the first abutting portion is connected to the second abutting portion through the bending portion; the first abutting portion is mounted and fixed on the third substrate, and the second abutting portion is mounted and fixed on the fourth substrate; the first abutting portion includes: at least one third conduction sheet, at least two third gaskets, and at least two third electrode elastic pieces; at least one of the third conduction sheets and at least two of the third gaskets are both mounted and fixed on the third substrate; the third electrode elastic piece protrudes from the surface of the third gasket and abuts against the positive or negative electrode of the battery cell through the third through hole; wherein, two of the third gaskets are connected by one of the third conduction sheets, and a plurality of third ventilation holes are provided on the third gasket; the second abutting portion includes: at least one fourth conduction sheet, at least two fourth gaskets, and at least two fourth electrode elastic pieces; wherein, at least one of the fourth conduction sheets and at least two of the fourth gaskets are both mounted and fixed on the fourth substrate; the fourth electrode elastic piece protrudes from the surface of the fourth gasket and abuts against the positive or negative electrode of the battery cell through the fourth through hole; wherein, two of the fourth gaskets are connected by one of the fourth conduction sheets, and a plurality of fourth ventilation holes are provided on the fourth gasket.

[0017] At least one beneficial effect of the battery pack provided by the embodiment of the present invention is that: compared with the traditional battery pack, it uses an electrical connection component formed by a flexible printed circuit board and nickel sheets mounted on the flexible printed circuit board to replace the traditional cable, which can avoid a series of problems caused by the traditional cable and nickel sheet during the soldering process, and can also reduce the use of cables and accessories, simplify the manufacturing process, thereby effectively reducing the manufacturing cost of the battery pack while improving the consistency, stability, and complete reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent the same elements, unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0019] Figure 1 It is a schematic structural diagram of the battery pack provided by the embodiment of the present invention;

[0020] Figure 2 It is an exploded structural diagram of the battery pack provided by the embodiment of the present invention;

[0021] Figure 3 It is an exploded schematic diagram of the electrical connection component provided by the embodiment of the present invention and with output terminals;

[0022] Figure 4 Schematic diagram of the structure for cutting and separating the first abutting portion and the second abutting portion of the second electrode nickel sheet provided by the embodiment of the present utility model.

[0023] Description of the drawings: 100, battery pack; 1, housing component; 2, battery pack; 21, series-connected battery cell group; 211, parallel-connected battery cell group; 201, battery cell; 3, electrical connection component; 31, flexible printed circuit board; 32, busbar nickel sheet; 33, first electrode nickel sheet; 34, second electrode nickel sheet; 311, first end; 312, second end; 313, nickel sheet embedding portion; 314, connection portion; 315, thermistor patch; 321, second conduction sheet; 322, second gasket; 323, second electrode elastic sheet; 331, first conduction sheet; 332, first gasket; 333, first electrode elastic sheet; 341, first abutting portion; 342, second abutting portion; 343, bending portion; 3110, first through hole; 3111, first substrate; 3112, first output terminal; 3113, second output terminal; 3120, second through hole; 3121, second substrate; 3131, third substrate; 3132, fourth substrate; 3133, bending arm; 3134, third through hole; 3135, fourth through hole; 3221, second ventilation hole; 3321, first ventilation hole; 3411, third conduction sheet; 3412, third gasket; 3413, third electrode elastic sheet; 3414, third ventilation hole; 3421, fourth conduction sheet; 3422, fourth gasket; 3423, fourth electrode elastic sheet; 3424, fourth ventilation hole; 4, battery management component; 5, output terminal; 6, insulating layer. Detailed implementation manners

[0024] The present utility model will be described in detail below in conjunction with specific embodiments. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present utility model.

[0025] It should be noted that, unless otherwise clearly specified and limited, the orientation or positional relationship indicated by terms such as "protruding from" used in this specification is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. Terms such as "installation", "matching", "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; "fixation" can be bolt fixation, snap fixation, or glue fixation; the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features; thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include one or more of such features; in addition, "and / or" includes any and all combinations of one or more of the related listed items; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0027] In this embodiment, the specific shape, structure, size, etc. of the "battery pack" are not limited, and those skilled in the art can selectively use any suitable implementation according to actual needs.

[0028] Figure 1 It is a schematic structural diagram of the battery pack provided by the embodiment of the present utility model. Figure 2 It is an exploded structural diagram of the battery pack provided by the embodiment of the present utility model. In traditional battery packs, the battery cells are usually electrically connected by cables and functions such as voltage sampling, temperature sampling, and power output are realized. In the embodiment of the present utility model, however, the electrical connection component 3 is used instead of the cable in the battery pack 100, so that the use of cables and auxiliary materials (such as solder, nickel strip ears, etc.; the nickel strip ears can weld the cable to the nickel strip) in this battery pack 100 can be reduced, thereby effectively reducing the material cost of this battery pack 100.

[0029] Please refer to Figure 1 and Figure 2 , the battery pack 100 includes: a housing component 1, a battery pack 2, an electrical connection component 3, and a battery management component 4.

[0030] Among them, a receiving space is formed inside the housing component 1. A battery pack 2 composed of a plurality of battery cells 201 is received and fixed in the receiving space, forming the basic structure of the battery pack.

[0031] Specifically, the battery cells in the battery pack 2 can be connected in series, parallel, or a combination of series and parallel.

[0032] Among them, "series connection" means connecting the positive and negative electrodes of multiple battery cells in sequence; and when a plurality of battery cells are connected in series, the voltage of the battery pack can be increased, but the capacity of the battery pack remains unchanged; in other words, when a plurality of battery cells are connected in series, the total voltage of the battery pack is equal to the sum of the voltages of each battery cell. This series connection situation is applicable to devices that require high voltage to achieve driving.

[0033] "Parallel connection" means connecting the positive electrodes of multiple battery cells together and the negative electrodes together to jointly output voltage and current; and when a plurality of battery cells are connected in parallel, the battery capacity can be increased, the load pressure on a single battery cell can be reduced, and the reliability of the battery pack can also be improved; that is, when a plurality of battery cells are connected in parallel, the total capacity of the battery pack is equal to the sum of the capacities of each battery cell. This means that the battery pack can provide a longer usage time or a larger current output while the voltage remains unchanged; in addition, since the load current is shared by each battery cell, this parallel connection situation can reduce the load pressure on a single battery cell, thereby effectively extending the service life of the battery cell; moreover, since the parallel connection situation can reduce the impact of a single battery cell on the overall performance, even if a certain battery cell fails, it will not immediately cause the entire battery pack to fail, thereby effectively improving the reliability of the battery pack.

[0034] "Series-parallel hybrid" means that in actual applications, in order to simultaneously meet the requirements of voltage and capacity, a connection method combining parallel and series connections is adopted. This series-parallel hybrid connection method can flexibly adjust the voltage and capacity, optimize the performance of the battery pack, and also achieve modular design. For example, the series-parallel hybrid connection method can flexibly adjust the voltage and capacity of the battery pack by adjusting the number of series-connected and parallel-connected battery cells to meet the requirements of different devices; and the series-parallel hybrid connection method can make full use of the performance characteristics of the battery cells, enabling the battery pack to achieve the best balance in terms of voltage, capacity, service life, and reliability; moreover, the series-parallel hybrid connection method can facilitate the combination of battery cells into battery packs with different voltages and different capacities through modular design, thereby reducing the complexity of production and maintenance.

[0035] In the embodiment of the present utility model, taking the battery pack 2 adopting the series-parallel hybrid connection method as an example, the electrical connection implementation method in the battery pack is described in detail.

[0036] The electrical connection component 3 is in contact with each battery cell respectively to establish the electrical connection between different battery cells in the battery pack, so that they form an integrated battery pack. The electrical connection component 3 mainly consists of a flexible printed circuit board forming a current conduction path and several nickel sheets.

[0037] Among them, a part of the area of the nickel sheet is in contact with the battery cell, and another part of the area of the nickel sheet is mounted and fixed on the flexible printed circuit board, so as to realize the electrical connection between the battery cell and the current conduction path, and further connect each battery cell into the circuit.

[0038] The electrical connection component 3 realized based on the flexible printed circuit board (Flexible Printed Circuit, FPC) has strong structural stability or electrical stability, and also has the advantage of convenient installation, which can simplify the manufacturing process of the battery pack 100, thus effectively reducing the manufacturing cost of the battery pack 100.

[0039] The battery management component (Battery Management System, BMS) is the link between the battery pack and the device. It can receive data states such as the voltage information, temperature information, power information, etc. of the battery pack, further analyze the above data states and the battery usage environment, so as to monitor the state of the battery system in real time, and can also prevent the battery from appearing in unsafe states such as overcharging, over-discharging, overheating, etc., to ensure the safe operation of the battery.

[0040] The flexible printed circuit board (Flexible Printed Circuit, FPC) is a conductor circuit pattern made by using photolithographic pattern transfer and etching process methods on the surface of a bendable substrate. It mainly consists of a substrate, a metal layer and a protective layer.

[0041] Specifically, the substrate is the basis of the flexible circuit board, which can be used to provide the support and insulation functions of the circuit. The commonly used substrate materials include: polyimide film (PI, Polyimide Film), polyester film (PET, Polyethylene Terephthalate), polyethylene naphthalate (PEN, Polyethylene Naphthalate) and polyvinyl chloride (PVC, Polyvinyl chloride); among them, the metal layer (or called the conductive layer) is the conductive part of the FPC, and is usually made of copper foil, and the thickness of the copper foil is usually between 0.009mm and 0.072mm. It can be etched into the shapes of wires, electrodes, etc. required by the design through special chemical corrosion and etching processes. The protective layer (or called the cover layer) is a layer of material coated on the surface of the FPC, which is used to protect the metal layer from damage and prevent the erosion of environmental factors such as oxidation and corrosion. The commonly used protective layer materials are polyester resin, polyurethane, etc.

[0042] In an embodiment of the present application, the battery pack 2 is connected to the battery management component 4 through the electrical connection component 3, enabling the battery management component 4 to manage and monitor the operating state of the battery pack 2.

[0043] In some embodiments, as Figure 2 shown, each battery cell 201 has a positive electrode and a negative electrode; the battery pack 2 includes at least two series-connected battery cell groups 21. Each series-connected battery cell group 21 is composed of at least two parallel-connected battery cell groups 211.

[0044] Among them, the above-mentioned parallel-connected battery cell groups 211 are composed of at least two battery cells 201 with the positive or negative electrodes on the same side, and each parallel-connected battery cell group 211 has a first polarity terminal and a second polarity terminal.

[0045] In addition, the first polarity terminal of one of the parallel-connected battery cell groups 211 in each series-connected battery cell group 21 is connected to the second polarity terminal of another parallel-connected battery cell group 211, and two adjacent series-connected battery cell groups 21 have opposite polarities on the same side.

[0046] Specifically, polarity refers to a characteristic formed between an electrode with a higher potential and an electrode with a lower potential. For example, the above-mentioned positive electrode or negative electrode is the polarity of the battery cell, and the above-mentioned first polarity terminal and second polarity terminal represent the polarity of the parallel-connected battery cell group.

[0047] In some embodiments, the electrical connection component 3 includes a flexible printed circuit board 31, at least one busbar nickel sheet 32, at least two first electrode nickel sheets 33, and at least two second electrode nickel sheets 34.

[0048] It can be understood that at least one busbar nickel sheet 32, at least two first electrode nickel sheets 33, and at least two second electrode nickel sheets 34 are all mounted and fixed on the flexible printed circuit board 31.

[0049] Specifically, the nickel sheet can be fixedly connected to the flexible printed circuit board 31 in any suitable manner, which is not specifically limited herein. For example, surface mount technology or welding.

[0050] Among them, the first polarity terminal and the second polarity terminal of each parallel-connected battery cell group 211 can be respectively connected to a first electrode nickel sheet 33 and a second electrode nickel sheet 34, or the first polarity terminal and the second polarity terminal of each parallel-connected battery cell group 211 can also be respectively connected to the busbar nickel sheet 32 and a second electrode nickel sheet 34.

[0051] Figure 3 It is a schematic exploded view of the electrical connection component provided by the embodiment of the present invention and with output terminals.

[0052] In some embodiments, in combination withFigure 2 and Figure 3 It can be seen that a voltage information can be formed between the positive electrode and the negative electrode of the battery cell 201.

[0053] Among them, the flexible printed circuit board 31 includes: a first end portion 311, a second end portion 312, a nickel sheet embedding portion 313, and a plurality of connecting portions 314

[0054] Among them, the first end portion 311, the second end portion 312 and the nickel sheet embedding portion 313 can be connected to each other through a plurality of connecting portions 314, and the nickel sheet embedding portion 313 is located between the first end portion 311 and the second end portion 312.

[0055] Preferably, the battery pack may further include: a plurality of thermistor patches 315. The thermistor patch 315 can be attached to the surface of the battery cell and is electrically connected to the connecting portion to form an electrical signal for reflecting the temperature information of the battery cell, and is provided to the battery management component 4 through the electrical connection component so that it can obtain the temperature information of the battery cell 201.

[0056] Among them, the thermistor patch is an electrical component whose resistance value decreases / increases as the temperature rises and has extremely high temperature sensitivity. For example, a negative temperature coefficient (NTC) thermistor patch, and there is an inverse relationship between its resistance value and temperature.

[0057] In some embodiments, please refer to Figure 2 and Figure 3 , the first end portion 311 includes: a first substrate 3111, a first output terminal 3112 and a second output terminal 3113.

[0058] Among them, the first output terminal 3112 and the second output terminal 3113 are both arranged on the first substrate 3111, and the two output terminals are far away from each other to avoid short circuit. The first substrate 3111 is connected to the connecting portion 314, and a plurality of first through holes 3110 are arranged on the first substrate 3111.

[0059] The first output terminal is the positive output terminal of the current conduction path, and the second output terminal is the negative output terminal of the current conduction path. Thus, the output voltage and output power of the battery pack can be obtained from the first output terminal 3112 and the second output terminal 3113.

[0060] In some embodiments, as Figure 2 and Figure 3 shown, the first electrode nickel sheet 33 includes: at least one first conduction sheet 331, at least two first gasket sheets 332 and at least two first electrode elastic sheets 333.

[0061] Among them, at least one first conduction sheet 331 and at least two first spacer sheets 332 are both mounted and fixed on the first substrate 3111. The first electrode elastic sheet 333 protrudes from the surface of the first spacer sheet 332 and abuts against the positive or negative electrode of the battery cell 201 through the first through hole 3110. One first conduction sheet 331 is connected between two first spacer sheets 332, and a plurality of first ventilation holes 3321 are formed in the first spacer sheet 332.

[0062] In some embodiments, as Figure 2 and Figure 3 shown, the second end portion 312 includes: a second substrate 3121. A plurality of second through holes 3120 are formed in the second substrate 3121, and the second substrate 3121 is connected to the connecting portion 314.

[0063] Correspondingly, the busbar nickel sheet 32 includes: a plurality of second conduction sheets 321, a plurality of second spacer sheets 322, and a plurality of second electrode elastic sheets 323.

[0064] Among them, a plurality of second conduction sheets 321 and a plurality of second spacer sheets 322 are both mounted and fixed on the second substrate 3121. The second electrode elastic sheet 323 protrudes from the surface of the second spacer sheet 322 and abuts against the positive or negative electrode of the battery cell 201 through the second through hole 3120.

[0065] In the embodiments of the present application, one second conduction sheet 321 is connected between any two second spacer sheets 322, and a plurality of second ventilation holes 3221 are formed in the second spacer sheet 322.

[0066] Figure 4 It is a schematic structural diagram of the second electrode nickel sheet provided by the embodiment of the present invention, which separates the first abutting portion and the second abutting portion at intervals.

[0067] In some embodiments, as Figures 2 to 4 shown, the nickel sheet embedding portion 313 includes: a third substrate 3131, a fourth substrate 3132, and a bending arm 3133.

[0068] Among them, a plurality of third through holes 3134 are formed in the third substrate 3131, and a plurality of fourth through holes 3135 are formed in the fourth substrate 3132. The third substrate 3131 is connected to the fourth substrate 3132 through the bending arm 3133.

[0069] Correspondingly, the second electrode nickel sheet 34 includes: a first abutting portion 341, a second abutting portion 342, and a bending portion 343.

[0070] Among them, a part of the first abutting portion 341 is mounted and fixed on the third substrate 3131, and a part of the second abutting portion 342 is mounted and fixed on the fourth substrate 3132. The first abutting portion 341 is connected to the second abutting portion 342 through a bending portion 343.

[0071] In some embodiments, as Figures 2 to 4 shown, the first abutting portion 341 includes: at least one third conduction sheet 3411, at least two third spacer sheets 3412, and at least two third electrode elastic sheets 3413.

[0072] Among them, at least one third conduction sheet 3411 and at least two third spacer sheets 3412 are both mounted and fixed on the third substrate 3131.

[0073] The third electrode elastic sheet 3413 protrudes from the surface of the third spacer sheet 3412 and abuts against the positive or negative electrode of the battery cell 201 through the third through hole 3134.

[0074] Specifically, two third spacer sheets 3412 are connected by one third conduction sheet 3411, and a plurality of third ventilation holes 3414 are formed in the third spacer sheet 3412.

[0075] In some embodiments, as Figures 2 to 4 shown, the second abutting portion 342 includes: at least one fourth conduction sheet 3421, at least two fourth spacer sheets 3422, and at least two fourth electrode elastic sheets 3423.

[0076] Among them, at least one fourth conduction sheet 3421 and at least two fourth spacer sheets 3422 are both mounted and fixed on the fourth substrate 3132. The fourth electrode elastic sheet 3423 protrudes from the surface of the fourth spacer sheet 3422 and abuts against the positive or negative electrode of the battery cell 201 through the fourth through hole 3135.

[0077] Two fourth spacer sheets 3422 are connected by one fourth conduction sheet 3421, and a plurality of fourth ventilation holes 3424 are formed in the fourth spacer sheet 3422.

[0078] In some embodiments, in combination with Figures 1 to 4 shown, the battery pack 100 may further include: two output terminals 5.

[0079] Among them, the two output terminals 5 are respectively arranged on the first output end 3112 and the second output end 3113, and are adapted to the terminal socket in the battery management component 4, so that the battery management component 4 establishes an electrical connection with the electrical connection component 3 in a plug-in connection manner.

[0080] Alternatively, the positions of the output terminal and the terminal socket can also be interchanged. For example, while the terminal socket is provided on the first substrate, the output terminal is provided on the battery management component 4.

[0081] Preferably, the battery pack 100 may further include a plurality of insulating layers 6. Among them, these insulating layers 6 can be provided between two adjacent series-connected battery cell groups 21 to form an insulating isolation, thereby avoiding the safety hazard of piercing damage to the battery cell insulating layer.

[0082] In summary, compared with the traditional battery pack, the battery pack provided by the embodiment of the present invention uses an electrical connection component to replace the cable and nickel sheet, which can reduce the use of cables and auxiliary materials on the premise of ensuring functions such as temperature sampling, voltage sampling, and power connection, thereby effectively reducing the material cost of this battery pack.

[0083] Moreover, the battery pack adopts the electrical connection component method, which can not only avoid manual wire arranging and fixing operations, but also simplify the manufacturing process of this battery pack, thereby effectively reducing the manufacturing cost of this battery pack, and can effectively improve the consistency, stability, and complete reliability of this battery pack.

[0084] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A battery pack, characterized in that, Comprising: A housing component; A battery pack composed of a plurality of battery cells; the battery pack is housed and fixed inside the housing component; An electrical connection component; The electrical connection component is in contact with each of the battery cells respectively to establish electrical connections between different battery cells in the battery pack; A battery management component; The battery management component is electrically connected to the battery pack through the electrical connection component; Wherein, the electrical connection component includes: A flexible printed circuit board forming a current conduction path; A plurality of nickel sheets; a part of the area of the nickel sheet is in contact with the battery cell, and another part of the area of the nickel sheet is mounted and fixed on the flexible printed circuit board, so that the battery cell establishes an electrical connection with the current conduction path.

2. The battery pack according to claim 1, characterized in that, The battery pack includes: at least two series-connected battery cell groups; each of the series-connected battery cell groups is composed of at least two parallel-connected battery cell groups; Wherein, each of the parallel-connected battery cell groups is composed of at least two battery cells; at least two battery cells forming the parallel-connected battery cell group have the same polarity on the same side; and At least two parallel-connected battery cell groups forming the series-connected battery cell group have opposite polarities on the same side.

3. The battery pack according to claim 2, characterized in that, The parallel-connected battery cell group has a first polarity end and a second polarity end facing away from each other; Wherein, the nickel sheet includes: at least one busbar nickel sheet, at least two first electrode nickel sheets and at least two second electrode nickel sheets; The first polarity end and the second polarity end of each of the parallel-connected battery cell groups are respectively welded and fixed to one of the first electrode nickel sheets and one of the second electrode nickel sheets; or The first polarity end and the second polarity end of each of the parallel-connected battery cell groups are respectively welded and fixed to one of the busbar nickel sheets and one of the second electrode nickel sheets.

4. The battery pack according to claim 3, characterized in that, The flexible printed circuit board includes: a first end portion, a second end portion, a nickel sheet embedding portion and a plurality of connection portions; Wherein, the first end portion, the second end portion and the nickel sheet embedding portion are connected through a plurality of the connection portions; The nickel sheet embedding portion is located between the first end portion and the second end portion, and the nickel sheet is mounted and fixed on the first end portion and the second end portion.

5. The battery pack according to claim 4, wherein, Further comprising: A plurality of thermistor patches and a plurality of insulating layers; Wherein, the thermistor patches are attached to the surface of the battery cell and are electrically connected to the connection portions to form an electrical signal for reflecting the temperature information of the battery cell; the insulating layers are arranged between two adjacent series-connected battery cell groups to form insulation isolation.

6. The battery pack according to claim 4, wherein The first end portion includes: A first substrate; the first substrate is provided with a plurality of first through holes, so that the nickel sheet mounted and fixed on the first substrate is welded and fixed to the battery cell through the first through holes; A first output terminal; the first output terminal is the positive output terminal of the current conduction path and is arranged on the first substrate; A second output terminal; the second output terminal is the negative output terminal of the current conduction path and is arranged on the first substrate, and is far away from the first output terminal; Wherein, the battery management component is electrically connected to the first output terminal and the second output terminal in a plug-in connection manner.

7. The battery pack according to claim 4, wherein, The second end portion includes: a second substrate; Among them, a plurality of second through holes are formed in the second substrate, so that the nickel sheets mounted and fixed on the second substrate are welded and fixed to the battery cell through the second through holes; The nickel sheet embedding part includes: a third substrate, a fourth substrate and a bending arm; Among them, the third substrate is connected to the fourth substrate through the bending arm; a plurality of third through holes are formed in the third substrate, and a plurality of fourth through holes are formed in the fourth substrate.

8. The battery pack according to claim 6, wherein, The first electrode nickel sheet includes: at least one first conduction sheet, at least two first gaskets and at least two first electrode elastic sheets; Among them, at least one of the first conduction sheets and at least two of the first gaskets are mounted and fixed on the first substrate; The first electrode elastic sheet protrudes from the surface of the first gasket and abuts against the positive or negative electrode of the battery cell through the first through hole; Two of the first gaskets are connected by one of the first conduction sheets, and a plurality of first ventilation holes are formed in the first gasket.

9. The battery pack according to claim 7, wherein, The busbar nickel sheet includes: a plurality of second conduction sheets, a plurality of second gaskets and a plurality of second electrode elastic sheets; Among them, a plurality of the second conduction sheets and a plurality of the second gaskets are mounted and fixed on the second substrate; The second electrode elastic sheet protrudes from the surface of the second gasket and abuts against the positive or negative electrode of the battery cell through the second through hole; Any two of the second gaskets are connected by one of the second conduction sheets, and a plurality of second ventilation holes are formed in the second gasket.

10. The battery pack according to claim 7, characterized in that, The second electrode nickel sheet includes: a first abutting portion, a second abutting portion and a bending portion; Among them, the first abutting portion is connected to the second abutting portion through the bending portion; the first abutting portion is mounted and fixed on the third substrate, and the second abutting portion is mounted and fixed on the fourth substrate; The first abutting portion includes: at least one third conduction sheet, at least two third gaskets and at least two third electrode elastic sheets; At least one of the third conduction sheets and at least two of the third gaskets are mounted and fixed on the third substrate; The third electrode elastic sheet protrudes from the surface of the third gasket and abuts against the positive or negative electrode of the battery cell through the third through hole; Among them, two of the third gaskets are connected by one of the third conduction sheets, and a plurality of third ventilation holes are formed in the third gasket; The second abutting portion includes: at least one fourth conduction sheet, at least two fourth gaskets and at least two fourth electrode elastic sheets; Among them, at least one of the fourth conduction sheets and at least two of the fourth gaskets are mounted and fixed on the fourth substrate; The fourth electrode elastic sheet protrudes from the surface of the fourth gasket and abuts against the positive or negative electrode of the battery cell through the fourth through hole; Among them, two of the fourth gaskets are connected by one of the fourth conduction sheets, and a plurality of fourth ventilation holes are formed in the fourth gasket.

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