Series-connected multi-layer battery pack structure and battery

Abstract

The invention provides a series multi-layer battery pack structure which comprises at least two overlapped battery cell group layers, and each layer comprises at least two battery cell groups; each battery cell group is a unit, and all the battery cell groups are connected in series to form an internal circuit; and a total positive electrode and a total negative electrode of the internal circuit are arranged in the same battery cell group layer. And assembling the multi-layer battery pack structure with a protective shell to form the battery provided by the invention. The invention aims to innovatively improve a multi-layer battery pack structure and a battery which can better adapt to different large-capacity customization requirements and better guarantee the use stability and the service life.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a multi-layer battery pack structure connected in series and a battery. Background Art

[0002] Electric vehicles, outdoor power supplies or other large power-consuming products all require long power supply life. Batteries, as an important energy storage carrier, have been continuously developed and innovated in various fields in recent years in an attempt to continuously improve power supply life and stability.

[0003] There are various battery pack (or battery) design structures in various application fields on the market. They are all assembled from several single cells. They use different module bracket structures and different connection circuits. The number of single cells that can be accommodated is different, and the power that the battery pack can output as a whole is also different; the production and assembly processes, procedures and costs are also very different; the stability and life of the battery are also very different. Therefore, with the large-scale development of new energy today, the battery field has been continuously developing and designing battery pack structures and batteries with different parameters such as shape, volume, and electrical performance required by the market. Summary of the invention

[0004] The present invention provides a multi-layer battery pack structure and a battery connected in series, aiming to innovate and improve a multi-layer battery pack structure and a battery that are better adapted to different large-capacity customization requirements and better ensure the stability of use and life.

[0005] A first aspect of the present invention provides a multi-layer battery pack structure connected in series, comprising at least two overlapping layers of battery cell groups, each layer comprising at least two battery cell groups; each of the battery cell groups is a unit, and all of the battery cell groups are connected in series to form an internal circuit; and the total positive and negative electrodes of the internal circuit are arranged in the battery cell group layers of the same layer.

[0006] In some embodiments of the present invention, in each layer of the battery cell groups, at most four of the battery cell groups are electrically connected to the battery cell groups in other layers across the layers.

[0007] In some embodiments of the present invention, when the number of the battery cell group layers is greater than or equal to three, the battery cell groups in each battery cell group layer can only be electrically connected to the battery cell groups in the same layer or in adjacent layers.

[0008] Furthermore, each of the battery cell groups is configured to have consistent electrical properties.

[0009] Furthermore, each of the battery cell groups includes at least two single battery cells, and all of the single battery cells have the same electrical performance; all of the single battery cells in the same battery cell group are connected in parallel to form a unit.

[0010] Furthermore, the single cell adopts a cylindrical single cell, and its positive and negative electrodes are respectively arranged on the top and bottom end surfaces; the series-connected multi-layer battery pack structure also includes a conductor connecting piece, and the conductor connecting piece includes two halves of an electrode connecting part connected in series; any two adjacent battery cell groups in the internal circuit connected in series are connected in series through the conductor connecting piece; and one half of the two halves of the electrode connecting part connects in parallel the positive electrodes of all the single cells in one of the two adjacent and connected battery cell groups, and the other half of the electrode connecting part connects in parallel the negative electrodes of all the single cells in the other adjacent and connected battery cell group.

[0011] In some embodiments of the present invention, the conductor connecting piece used by the two battery cell groups connected in series across layers further includes a conductor hinge portion, and the two halves of the electrode connecting portions are connected via the conductor hinge portion.

[0012] In some embodiments of the present invention, the series-connected multi-layer battery pack structure further includes a monitoring circuit, and the monitoring circuit is configured using an integrally formed flexible circuit board; at least one monitoring point of the monitoring circuit is provided in each of the battery cell layers.

[0013] In some embodiments of the present invention, any two adjacent battery cell layers are connected by structural hinges, and the entire series-connected multi-layer battery pack structure can be flipped between the overlapping position and the flatly unfolded position through each of the structural hinges.

[0014] A second aspect of the present invention provides a battery, comprising a housing and a battery pack structure as described in any one of the above, wherein the battery pack structure is inserted into the housing.

[0015] The technical solution provided by the embodiments of the present application may have the following beneficial effects: The battery pack structure of the present invention can be designed to accommodate as many battery cell groups (at least two) as possible in each layer of battery cell groups according to the sizes of various customized battery packs, so that the limited width area in each layer has a higher utilization rate, so that the assembled battery pack with limited volume can store more electrical energy.

[0016] Moreover, all the battery cells in the entire battery pack are connected in series to form the internal circuit of the battery pack, which not only simplifies the connection of the internal circuit; but also, through a large number of R&D experiments, it has been verified that such an internal circuit has better dynamic stability of electric energy, voltage and current during the charging and discharging process, and the battery cells in almost every area bear a similar workload. Therefore, after the battery pack is used for a long time, it is not easy for individual cells or single cells in some areas to suffer from out-of-group damage.

[0017] Furthermore, the positions of the total positive and negative electrodes of the internal circuit are concentrated in the same layer of battery cell groups, which facilitates the connection of the total positive and negative electrodes of the internal circuit to the control module and / or the power output module, further optimizing the circuit connection, thereby making the overall battery pack structure more compact.

[0018] At the same time, each layer of battery cell groups includes at least two battery cell groups, which is also convenient for designing the total positive and negative electrodes of the internal circuit in two different series units, that is, the unit positive electrode of the first battery cell group serves as the total positive electrode of the internal circuit, and the unit negative electrode of the last battery cell group of the internal circuit formed by connecting all the battery cell groups in series serves as the total negative electrode of the internal circuit, thereby better ensuring the power-on stability of the total positive and negative electrodes of the internal circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0020] Figure 1 It is a schematic structural diagram of an embodiment of a multi-layer battery pack structure of the present invention (overlapping position state); Figure 2 yes Figure 1 A schematic diagram of the structure of the embodiment in a flat-laying position (including 2 viewing angles); Figure 3 yes Figure 1 A schematic diagram of the structure of the FPC monitoring circuit in the embodiment when it is in a bent state; Figure 4 yes Figure 2 A schematic diagram of a circuit trend in which the internal circuits are connected in series when the embodiment is in the state; Figure 5 It is a schematic diagram of the structure in which two adjacent battery cell groups in the same layer are connected by a conductor connecting piece; Figure 6 It is a schematic structural diagram of an embodiment of a conductor connecting piece (with a conductor hinged portion) (two forms); Figure 7 It is a schematic diagram of the structural decomposition of an embodiment of a structural hinge; Figure 8 yes Figure 7 A schematic diagram of the structural combination of the structural hinge parts shown (in the process of flipping and folding); Fig. 9 yes Figure 1 A schematic diagram of the structure of the embodiment in the process of flipping; Fig.10is a schematic diagram of the structure of another embodiment of a multi-layer battery pack structure of the present invention and a shell constituting a battery; Fig.11 yes Fig.10 A schematic diagram of a circuit trend in which the internal circuits of the embodiment are connected in series; in, 10 Shell, 20 battery cell layer, 21 module support, 22 single battery cell, 23 total positive and negative electrodes of the internal circuit, 30 conductor connecting piece, 31 electrode connecting part, 32 conductor hinge part, 321 conductor connecting plate, 322 easy bending part, 323 avoidance gap, 40 structural hinge, 41 structural connecting plate, 42 rotating assembly, 421 rotating shaft, 422 limiting ring, 50 insulation board, 60 interval protrusions, 70 control module and / or power output module, 80 monitoring circuit, 81 monitoring point. Implementation

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0024] A first aspect of the present invention provides a multi-layer battery pack structure connected in series, comprising at least two overlapping layers of battery cell groups 20, each layer comprising at least two battery cell groups; each battery cell group is a unit, and all battery cell groups are connected in series to form an internal circuit; and the total positive and negative electrodes 23 of the internal circuit are arranged in the battery cell group layer 20 of the same layer.

[0025] The battery pack structure of the present invention can be designed to accommodate as many battery cell groups (at least two) as possible in each battery cell group layer 20 according to the sizes of various customized battery packs, so that the limited width area in each layer has a higher utilization rate, so that the assembled battery pack with limited volume can store more electrical energy.

[0026] Moreover, all the battery cell groups in the entire battery pack are connected in series to form the internal circuit of the battery pack, which not only simplifies the connection of the internal circuit; but also, through a large number of R&D experiments, it has been verified that such an internal circuit has better dynamic stability of electric energy, voltage and current during the charging and discharging process, and the battery cell groups in almost every area bear similar workloads. Therefore, after the battery pack is used for a long time, it is not easy for individual or partial areas of the single battery cells 22 to suffer out-of-group damage.

[0027] Furthermore, the positions of the total positive and negative electrodes 23 of the internal circuit are concentrated in the same layer of the battery cell group layer 20, which facilitates the connection of the total positive and negative electrodes 23 of the internal circuit to the control module and / or the power output module 70, further optimizing the circuit connection, thereby making the battery pack structure more compact as a whole. Figure 1 and 2 In the embodiment shown, three layers of overlapping battery cell groups 20 are provided, each layer includes six battery cell group units, each battery cell group unit is formed by seven cylindrical single battery cells 22 connected in parallel, and this embodiment is referred to as a "seven parallel, eighteen series" battery pack, and its series circuit trend is as follows Figure 4 As shown; further, in a battery pack with multiple layers overlapping like this, the single cells 22 in each layer of the battery cell group 20 are generally inserted between the upper and lower module brackets 21. This embodiment also achieves that the installation arrangement positions of the single cells 22 in each layer are consistent, so only one bracket mold needs to be designed, and the module bracket 21 produced by the mold is suitable for being configured as the upper module bracket 21 and the lower module bracket 21 of each layer of the battery cell group 20, which greatly reduces the mold opening cost and the subsequent production cost.

[0028] It should be noted that although the positions of the single cells 22 of each layer are arranged and installed in the same manner, an adapted conductor connecting piece 30 can be designed according to the customization requirements to realize that every seven adjacent single cells 22 are connected in parallel as one unit, and the conductor connecting piece 30 is also used to realize the series connection of two adjacent units that need to be connected. Of course, it is not limited to this embodiment, and can also refer to the following embodiments. Fig.10 Another embodiment shown in the figure or other embodiments that do not depart from the technical solution of the present invention. Fig.10 The embodiment shown is similar to Figure 1 The embodiment shown is similar, also with three overlapping battery cell groups 20, but each layer includes seven battery cell group units (according to the customized required electrical energy, the top layer has only six battery cell groups, which is used as an example to facilitate the description of the following content). Each battery cell group unit is composed of six cylindrical single battery cells 22 connected in parallel. This embodiment is referred to as a "six parallel, twenty series" battery pack. Since the last battery cell group and the first battery cell group of its internal circuit are located in different battery cell group layers 20, the negative electrode lead of the last battery cell group needs to be connected to the same level as the positive electrode of the first battery cell group as the total positive and negative electrodes 23 of the internal circuit, so as to connect to the control module and / or the power output module 70.

[0029] At the same time, each cell group layer 20 includes at least two cell groups, which is also convenient for designing the total positive and negative electrodes 23 of the internal circuit in two different series units, that is, the unit positive electrode of the first cell group serves as the total positive electrode of the internal circuit, and the unit negative electrode of the last cell group of the internal circuit formed by connecting all the cell groups in series serves as the total negative electrode of the internal circuit, thereby better ensuring the power-on stability of the total positive and negative electrodes 23 of the internal circuit.

[0030] In order to further simplify and optimize the electrical connection structure and processing technology of the internal circuit, in some embodiments of the present invention, in each layer of the battery cell group layer 20, at most four battery cell groups are electrically connected to the battery cell groups of other layers across the layer. Of course, it can be understood that this configuration is mainly applicable to embodiments in which a certain layer of the battery cell group layer 20 includes more than or equal to four battery cell groups, for example Figure 4 In the embodiment shown, in the connection trend of the internal circuit connected in series, four cell groups in the middle cell group layer 20 are connected in series with other cell groups across layers. Of course, such a design is also to connect the cell groups in series with the cell groups in the same layer as much as possible on the basis of all the cell groups being connected in series to form the internal circuit, so as to achieve the design purpose of simplifying and optimizing the connection circuit, which is conducive to reducing the failure rate in later use.

[0031] In order to further simplify and optimize the electrical connection structure and processing technology of the internal circuit, in some embodiments of the present invention, when the number of the cell group layers 20 is greater than or equal to three layers, the cell groups in each cell group layer 20 can only be electrically connected to the cell groups in the same layer or in the adjacent layer. The cell groups are not connected across layers with cell groups outside the adjacent layers, which saves the conductor material between any two adjacent cell groups in the series circuit and reduces the occupied space.

[0032] In order to ensure that the battery pack structure has reliable stability during the charging and discharging process and long-term use, in some embodiments of the present invention, the electrical properties of each battery cell group are configured to be consistent. It can be understood that the electrical performance refers to the battery cell attribute parameters, that is, the electrical energy that each battery cell group can charge and discharge, the voltage and current during charging and discharging, and the thermal stability and other attributes are consistent, so as to better ensure the overall stability of the battery pack and the long-term service life. Even in more rigorous battery pack products, the chemical reaction rate inside the battery cell and the life of repeated reactions are roughly similar. Furthermore, according to the requirements of the structure and other factors of the customized product, it is also possible to select a configuration with unified attribute parameters such as the shape, size, quantity, material, and specifications of the "battery cell group and / or the single battery cell 22 that constitutes the battery cell group" to better adapt to some battery products with more stringent customization requirements.

[0033] In some embodiments of the present invention, each cell group includes at least two single cells 22, and all single cells 22 have the same electrical properties (as described in the previous paragraph); all single cells 22 in the same cell group are connected in parallel to form a unit as described above (i.e., a cell group is one of the components in the internal circuit connected in series), and according to the output power of the customized battery pack structure, multiple single cells 22 are first connected in parallel, so that the capacity of a single cell group is larger, and a larger voltage and current can pass through the series circuit. And each cell group composed of the same single cell 22 has the same electrical properties, which better guarantees the stability of each section of the internal circuit connected in series during operation, and is beneficial to the service life of the battery pack structure. Of course, it is understandable that the design focus of battery pack products with different customized requirements is different, so this embodiment should not be understood as the maximum limitation of the present invention.

[0034] In order to assemble a battery pack that can accommodate greater electrical energy within a limited volume space, in some embodiments of the present invention, the above-mentioned single-cell battery 22 adopts a cylindrical single-cell battery 22, and its positive and negative electrodes are respectively arranged on the top and bottom end surfaces of the battery body (for example, a common 21700 cylindrical lithium battery can be used); the series-connected multi-layer battery pack structure also includes a conductor connecting piece 30, and the conductor connecting piece 30 includes two halves of an electrode connecting portion 31 connected in series; any two adjacent battery cell groups in the internal circuit connected in series are connected in series through the conductor connecting piece 30; and one half of the two halves of the electrode connecting portion 31 connects in parallel the positive electrodes of all single-cell batteries 22 in one of the two adjacent and connected battery cell groups, and the other half of the electrode connecting portion 31 connects in parallel the negative electrodes of all single-cell batteries 22 in the other adjacent and connected battery cell group. For example, you can refer to Figure 2 and 8 In the embodiment shown in the figure, any two adjacent battery cell groups in the same layer that need to be connected, such as Figure 5As shown, the positive electrodes of all the single cells 22 of one group and the negative electrodes of all the single cells 22 of the other group are in the same direction, and the two half electrode connecting parts 31 are used to connect the two groups of opposite electrodes in the same direction one by one, and the two half electrode connecting parts 31 are connected to realize the series connection between the two units in the internal circuit. Thus, the structure of the conductor connecting piece 30 is optimized and simplified, which not only reduces the space occupation rate, but also facilitates the processing and production of such an integrally formed conductor connecting piece 30, saving material costs and assembly costs.

[0035] Since all the cell groups in the battery pack are connected in series to the same internal circuit, in order to facilitate better series connection of two adjacent and connected cell groups across layers, in some embodiments of the present invention, the conductor connecting piece 30 used by the two cell groups connected in series across layers also includes a conductor hinge 32, and the two half electrode connecting parts 31 are connected through the conductor hinge 32. Through the rotation function of the conductor hinge 32, the two half electrode connecting parts 31 can not only be welded with the electrodes of the two groups of cell groups, but also can be rotated and adjusted adaptively in accordance with the relative positions of the two layers of cell groups 20, so as to ensure that the two units are connected in parallel respectively, while maintaining the series connection between the two adjacent units; further, it can also adapt to the flipping activities of the two layers of cell groups 20.

[0036] In some embodiments of the present invention, the conductor hinge portion 32 is, for example but not limited to, Figure 6 The structure of the embodiment shown is as follows: the conductor hinge 32 includes a conductor connecting plate 321 and two sections of easily bendable portions 322; the two halves of the electrode connecting portion 31 are each connected to the two ends of the conductor connecting plate 321 through a section of the easily bendable portion 322; and avoidance notches 323 are respectively provided at the ends of the two sides of the easily bendable portion 322. In the process of flipping the battery cell layer 20, the easily bendable portion 322 of the conductor hinge 32 will deform and bend to adapt to the flipping angle; the avoidance notch 323 also provides an avoidance space for the electrode connecting portion 31 and the conductor connecting plate 321 to rotate.

[0037] In order to ensure that the battery pack has stable electrical performance, the battery pack power-on performance test experiment proves that in some embodiments of the present invention, the area of ​​the connecting portion of the two half electrode connecting portions 31 is greater than or equal to twice the area of ​​a single electrode of a single single cell 22. In order to save materials and occupy space, the portion where the two half electrode connecting portions 31 are connected (such as the conductor connecting plate 321 and the bendable portion 322 introduced in the previous paragraph) is designed with a suitable conductor area, which not only makes the structure compact and optimized, but also ensures that the voltage and current will not exceed the capacity and overload through certain serial interfaces or units, effectively ensuring the stability and life of the battery pack.

[0038] In order to better assemble the multi-layer battery pack structure in series provided by the present invention, in some embodiments of the present invention, any two adjacent battery cell layers 20 are also connected by a structural hinge 40, and each structural hinge 40 can realize the flipping of the entire multi-layer battery pack structure in series between the overlapping position and the flat-laying position. That is, the two adjacent layers of battery cell layers 20 can realize a relative flipping activity of a certain angle by means of the rotation function of the structural hinge 40 installed and connected between them; and the structural hinge 40 is set between any two adjacent battery cell layers 20 (when all battery cell layers 20 are in the overlapping position state), then all battery cell layers 20 can be flipped layer by layer from their overlapping position state to the position where all battery cell layers 20 are flat-laying through these structural hinges 40; and all battery cell layers 20 can be flipped back to the overlapping position in the opposite direction by using these structural hinges 40. By utilizing the flipping mechanism, when assembling the battery pack structure, the assembly and electrode welding of multiple layers of battery cell layers 20 can be simultaneously performed when all battery cell layers 20 are in a flat and unfolded position. After the operation is completed, the hinged action of these structural hinges 40 is utilized to flip each layer of battery cell layers 20 to an overlapping position. Moreover, during the flipping process, the cross-layer connected conductor connecting piece 30 can also be adapted to complete the flipping activity with the assistance of the conductor hinge part 32. Furthermore, the positive and negative electrodes of the single battery cell 22 are respectively arranged on the top and bottom end surfaces of the battery cell body. Therefore, when welding the electrodes, it is only necessary to divide all the electrodes on the top and bottom surfaces into two batches for unified welding, thereby improving the processing operation mode and process, and further effectively improving the processing efficiency. In particular, the use of an intelligent automated production line greatly improves the daily production capacity.

[0039] The structural hinge 40 may refer to the following embodiments, but should not be construed as being limited thereto. In some embodiments of the present invention, the structural hinge 40 includes a structural connection plate 41 and two sets of rotational assemblies 42; each set of rotational assemblies 42 is used to independently and flipably hinge the structural connection plate 41 with one of the two adjacent battery cell assembly layers 20.

[0040] In order to ensure that the structural hinge 40 is evenly stressed during the flipping of the battery cell layer 20, and to ensure that the two adjacent battery cell layers 20 have the same flipping angle relative to the structural connecting plate 41, in some embodiments of the present invention, the two sets of rotating assemblies 42 are symmetrically arranged, which is also more convenient for processing, production and installation of the connector.

[0041] Further, in some embodiments of the present invention, each set of rotating assembly 42 includes an adaptive rotating shaft 421 and a limiting ring 422; and each set of rotating shaft 421 and limiting ring 422, one of which is arranged on the structural connecting plate 41, and the other is arranged on the side of the battery core layer 20. For example but not limited to Figure 7 and 8In the embodiment shown in the figure, the limiting ring 422 is arranged at the edge of the module support 21 of the battery core layer 20 (so that it can be integrally formed with the module support 21, reducing costs and reducing spare parts), and the rotating shaft 421 is arranged on the structural connecting plate 41 (for example, Figure 7 and 8 As shown in the figure, a perforation is provided on the structural connecting plate 41, so that the two sides form a symmetrical cylindrical shape as the rotating shaft 421, which also reduces the material used for the structural connecting plate 41, and the perforation also provides an escape space for rotation). In order to facilitate the installation of the rotating assembly 42, further, the limit ring 422 is designed as follows Figure 7 The opening stop ring 422 shown is also closely linked to one of the lightweight design features of the product of the present invention. While reducing the number of assembly parts, quick installation can be achieved by simply aligning the structural connecting plate 41 at a few positions and pressing.

[0042] Secondly, in some embodiments of the present invention, a spacing protrusion 60 is further provided between two adjacent layers of battery cell groups 20, including: (1) between two adjacent overlapping surfaces of any two adjacent layers of battery cell groups 20 when they are in an overlapping position, so as to form a spacing layer distance, separate the adjacent and close surfaces, better dissipate heat, and form a safe distance between the cross-layer battery cell electrodes to prevent short circuits. For example, Figure 2 , 7 There are several different designs shown in , 8 and 9. In addition to being used to space the layers, some of them are also used as end stoppers to limit the maximum depth of the single cell 22 when it is inserted into the module bracket 21, so that the entire layer of cell groups 20 can be assembled flat; further, some also play a positioning role when flipping and overlapping; some are designed as protruding through tubes for bolts to pass through and cooperate with the nuts at the end of the bolts to lock all the cell groups 20 along the length direction of the bolts. (Of course, if Figure 1 As shown, by setting the additional positioning and through-tube type spacing protrusions 60 higher, the height of the additional spacing protrusions 60 for end face limiting can be simplified, saving materials and forming a larger ventilation space. ) and / or, (2) set between the two sides of any two adjacent layers of battery cell groups 20 that are close to each other when flatly laid out, to form a spacing width, better prevent excessive collisions, form a certain spacing and better assemble operations. It can be understood that these spacing protrusions 60 can be as follows Figure 1 , 7 , 8 and 10, the module support 21 is integrally formed with the battery cell layer 20, but other arrangements may also be used.

[0043] In order to prevent short circuit, in some embodiments of the present invention, when the battery pack structure is in an overlapping position, an insulating plate 50 is sandwiched between the layers to prevent short circuit across the layers.

[0044] In order to facilitate the acquisition of the working parameters of the battery pack during service, in some embodiments of the present invention, the series-connected multi-layer battery pack structure also includes a monitoring circuit 80, and the monitoring circuit 80 is configured using an integrally formed flexible circuit board (abbreviated as soft board or FPC, which has the characteristics of high wiring density, light weight, and thin thickness); at least one monitoring point 81 of the monitoring circuit 80 is provided in each battery cell layer 20. Of course, the design of the FPC monitoring circuit 80 and the layout of the monitoring points 81 are designed according to the customized product and are not limited here. For example, it can be used as follows Figure 1 , 2 , 3 and 10 are schematic diagrams of the embodiment structure. The integrally formed whole FPC is flexible, so its unfolded state is convenient for installation when all the battery cell layers 20 are in a flat and unfolded position. In this state, the various connection points and positioning points of the FPC are adapted and installed. By utilizing the softness of the FPC, the assembled battery cell layers 20 are flipped and folded from the flat and unfolded position to the fully overlapping position as described above. The FPC monitoring circuit 80 will bend to adapt to the flipping movement and angle. The flat and thin FPC monitoring circuit 80 not only better reduces the wiring space occupied by the monitoring circuit 80, but also can be uniformly mass-produced, is easy to disassemble and assemble, and is very suitable for the multi-layer overlapping battery pack structure of the present invention.

[0045] It should be noted that this application is mainly aimed at protecting the above-mentioned contents of the multi-layer battery pack structure, which has been analyzed in detail above. The other structures and principles of the battery pack structure can refer to existing technical products or future innovative and adapted technical products of the present invention, and will not be fully described here.

[0046] The second aspect of the present invention provides a battery, including a housing 10 and any one of the battery pack structures described above, wherein the battery pack structure is inserted into the housing 10 to form a battery product, such as a power battery for an electric vehicle, an outdoor mobile power supply battery, and the like.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] The disclosure above provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described above. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A multi-layer battery pack structure connected in series, characterized in that: It comprises at least two overlapping battery cell groups, each layer comprising at least two battery cell groups; Each of the battery cell groups is a unit, and all of the battery cell groups are connected in series to form an internal circuit; And the total positive and negative electrodes of the internal circuit are arranged in the same layer of the battery cell group.

2. A multi-layer battery pack structure connected in series as claimed in claim 1, characterized in that: In each layer of the battery cell groups, at most four of the battery cell groups are electrically connected to the battery cell groups in other layers across the layers.

3. A multi-layer battery pack structure connected in series as claimed in claim 1, characterized in that: When the number of the battery cell group layers is greater than or equal to three, the battery cell groups in each battery cell group layer can only be electrically connected to the battery cell groups in the same layer or in adjacent layers.

4. A multi-layer battery pack structure connected in series as claimed in claim 1, characterized in that: The electrical performance of each of the battery cell groups is consistent.

5. A multi-layer battery pack structure connected in series as claimed in claim 4, characterized in that: Each of the battery cell groups includes at least two single battery cells, and all of the single battery cells have the same electrical performance; All the single cells in the same cell group are connected in parallel to form a unit.

6. A multi-layer battery pack structure connected in series as claimed in claim 5, characterized in that: The single cell battery adopts a cylindrical single cell battery, and its positive and negative electrodes are respectively arranged on the top and bottom end surfaces; The multi-layer battery pack structure connected in series also includes a conductor connecting piece, wherein the conductor connecting piece includes an electrode connecting portion connected in two halves; Any two adjacent battery cell groups in the internal circuit connected in series are connected in series through the conductor connecting piece; and one half of the two halves of the electrode connecting portion connects in parallel the positive electrodes of all the single battery cells in one of the two adjacent and connected battery cell groups, while the other half of the electrode connecting portion connects in parallel the negative electrodes of all the single battery cells in the other adjacent and connected battery cell group.

7. A multi-layer battery pack structure connected in series as claimed in claim 6, characterized in that: The conductor connecting piece used by the two battery cell groups connected in series across layers also includes a conductor hinge portion, and the two halves of the electrode connecting portions are connected via the conductor hinge portion.

8. The multi-layer battery pack structure connected in series as claimed in claim 1, characterized in that: The multi-layer battery pack structure connected in series also includes a monitoring circuit, and the monitoring circuit is configured using an integrally formed flexible circuit board; At least one monitoring point of the monitoring circuit is provided in each of the battery cell layers.

9. The multi-layer battery pack structure connected in series as claimed in claim 1, characterized in that: Any two adjacent battery cell groups are also connected via structural hinges, and each of the structural hinges can be used to flip the entire series-connected multi-layer battery pack structure between two position states: an overlapping position and a flatly laid-out position.

10. A battery, characterized in that: It comprises an outer shell and a multi-layer battery pack structure connected in series as claimed in any one of claims 1 to 9, wherein the battery pack structure connected in series is plugged into the outer shell.

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