Battery device and electric device

Abstract

The utility model relates to the technical field of batteries, discloses a battery device and a power utilization device, and can improve the energy density of the battery device to a certain extent. The battery device comprises a soft package battery cell group and an electrical part, the soft package battery cell group comprises a plurality of soft package battery cells arranged along a first direction, each soft package battery cell is adhered to the box body and comprises a packaging bag and an electrode lead, and the electrode lead is arranged at the end part of the packaging bag along a second direction; all the electrode leads, positioned on the same side, of the plurality of soft-packaged cells of the soft-packaged cell group are sequentially arranged along the first direction, and along the third direction, the plurality of electrode leads and the end part of the soft-packaged cell group form an accommodating gap; the electrical part is arranged in the accommodating gap and is electrically connected with the electrode lead; the first direction, the second direction and the third direction are arranged at included angles pairwise. The electrical part is arranged in the accommodating gap, so that the structure of the battery device is more compact, the space is saved, and the energy density of the battery device is favorably improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In the related art, a battery device generally includes a plurality of soft-pack cells, which are arranged in a box. In order to collect parameters such as voltage or current of the soft-pack cells for reference by the battery management system, the end of each soft-pack cell is electrically connected to a battery monitoring unit. In a battery device, the energy density of the battery device is a relatively important parameter. Therefore, how to reasonably arrange the positions of components such as the battery monitoring unit to make the structure of the battery device compact, reduce the volume of the battery device, and thus improve the energy density of the battery device has become a technical problem to be solved. Utility Model Content

[0003] In view of the above problems, the present application provides a battery device and an electrical device, and can at least improve the energy density of the battery device.

[0004] In the first aspect, the present application provides a battery device. The battery device includes a box, a soft-pack battery group and an electrical component, wherein the soft-pack battery group includes a plurality of soft-pack batteries arranged along a first direction, each soft-pack battery is bonded to the box, and includes a packaging bag and an electrode lead, the electrode lead is arranged at the end of the packaging bag along a second direction, and all the electrode leads of the plurality of soft-pack batteries of the soft-pack battery group on the same side are arranged in sequence along the first direction, and along the third direction, the plurality of electrode leads and the end of the soft-pack battery group form a receiving gap; the electrical component is arranged in the receiving gap and is electrically connected to the electrode lead; the first direction, the second direction and the third direction are arranged at an angle to each other.

[0005] In the soft-pack battery cell group of the battery device of the embodiment of the present application, multiple soft-pack battery cells are arranged along a first direction, and electrode leads are provided at the ends of the soft-pack battery cells along a second direction. All electrode leads of the multiple soft-pack battery cells located on the same side are arranged in sequence along the first direction and form a accommodating gap with the ends of the soft-pack battery cell group in a third direction. Electrical components are arranged in the accommodating gap and connected to the electrode leads, so that the electrical components can use the accommodating gap as an installation space, making the structure of the battery device more compact and saving space, which in turn helps to improve the energy density of the battery device.

[0006] According to some embodiments of the present application, optionally, the electrical component includes a battery monitoring unit and / or an electrical connector.

[0007] In the above technical solution, the electrical component includes a battery monitoring unit and / or an electrical connector. The electrical component can be electrically connected to the electrode lead through one of the battery monitoring unit and the electrical connector. The battery monitoring unit and / or the electrical connector can be electrically connected to the soft-pack battery cell through the electrode lead, so that the battery management system can monitor and adjust the soft-pack battery cell group through the electrical component. In addition, the electrical component can further obtain the parameters of the soft-pack battery cell for the battery management system as a reference for management strategy.

[0008] According to some embodiments of the present application, optionally, the electrical component includes a battery monitoring unit and an electrical connector, wherein the electrical connector is located between the electrode lead and the battery monitoring unit, and the electrical connector electrically connects the battery monitoring unit and the electrode lead.

[0009] In the above technical solution, the electrical connector is located between the electrode lead and the battery monitoring unit and connects the electrode lead and the battery monitoring unit, so that the electrode leads of multiple soft-pack battery cells can be transferred to the battery monitoring unit through the electrical connector, further utilizing the space of the accommodating gap in the third direction, making the structure more compact, and saving the installation space required for the battery monitoring unit while realizing the electrical connection between the battery monitoring unit and multiple soft-pack battery cells.

[0010] According to some embodiments of the present application, optionally, the battery device includes a main control board, the electrical component includes a battery monitoring unit, and the battery monitoring unit is electrically connected to the main control board.

[0011] In the above technical solution, the battery device includes a main control board, and the electrical components include a battery monitoring unit. The battery monitoring unit is electrically connected to the main control board, and the battery monitoring unit can collect parameters of the soft-pack battery cells, so that the main control board can accurately and reliably obtain the parameters of the soft-pack battery cells, and timely adjust the control strategy of the battery device according to the status of the soft-pack battery cells.

[0012] According to some embodiments of the present application, optionally, the box body includes a bottom plate, and the accommodating gap is located between the bottom plate and the electrode lead.

[0013] In the above technical solution, the battery device accommodates the soft-pack battery cell group through a box body, and the box body can provide support and protection for the soft-pack battery cells. The accommodating gap is located between the bottom plate of the box body and the electrode lead, so that the boundary range of the accommodating gap in the third direction is clearer, and the bottom plate can provide support for the electrical components in the accommodating gap, so that the electrical components can be installed more stably in the accommodating gap.

[0014] According to some embodiments of the present application, optionally, the battery device includes a bracket connected to the box body, and the electrical components are installed on the bracket.

[0015] In the above technical solution, the bracket is connected to the box body, and the electrical components are installed on the bracket, so that the electrical components can be connected to the box body through the bracket, thereby increasing the installation stability and reliability of the electrical components and facilitating improving the overall rigidity and strength of the battery device.

[0016] According to some embodiments of the present application, optionally, the electrical components are bonded to the box wall of the box body.

[0017] In the above technical solution, the electrical components are bonded to the box wall of the box body so that the electrical components and the box wall are connected as a whole, which is beneficial to the integration of the electrical components and the box body, saves space, facilitates the assembly of internal components of the battery device, and helps to provide insulation isolation protection between the electrical components and the box body.

[0018] According to some embodiments of the present application, optionally, the electrical component includes a battery monitoring unit, and a length of the battery monitoring unit extends along the first direction.

[0019] In the above technical solution, the length of the battery monitoring unit extends along the first direction, and the accommodating gap also extends along the first direction, so that the battery monitoring unit can fully fill the space where the accommodating gap is located, thereby improving space utilization.

[0020] According to some embodiments of the present application, optionally, there are multiple soft-pack battery cell groups, the multiple soft-pack battery cell groups are arranged along the second direction, and the electrical components are arranged between two groups of soft-pack battery cell groups or on one side of all the soft-pack battery cell groups.

[0021] In the above technical solution, there are multiple soft-pack battery cell groups, which can increase the overall output voltage of the battery device. Along the second direction, the electrical components are arranged between two groups of soft-pack battery cell groups or on one side of all the soft-pack battery cell groups, thereby making the structure more compact and saving space in the second direction.

[0022] According to some embodiments of the present application, optionally, the electrical component includes a battery monitoring unit, and at least one electrode lead of each soft-pack battery cell is electrically connected to the battery monitoring unit through a conductive component.

[0023] In the above technical solution, at least one electrode lead of each soft-pack battery cell is electrically connected to the battery monitoring unit through a conductive member, so that the battery monitoring unit can establish an electrical connection with each soft-pack battery cell, so that the battery monitoring unit can monitor the status of each soft-pack battery cell and improve the precision of monitoring and management of the battery management system.

[0024] According to some embodiments of the present application, optionally, a corner space is formed at a corner of the packaging bag along the third direction, the conductive member is at least partially located in the corner space, and the conductive member extends along the second direction.

[0025] In the above technical solution, a corner space is formed at the corner of the packaging bag along the third direction, the conductive member is at least partially located in the corner space, the conductive member extends along the second direction, and the corner of the packaging bag along the third direction also extends along the second direction, so that the conductive member can extend in the corner space, thereby making full use of the volume space occupied by the soft-pack battery cell to accommodate the conductive member and improving space utilization.

[0026] According to some embodiments of the present application, optionally, the conductive member includes a first end and a second end opposite to each other, the first end is welded or bonded to the electrode lead, and the second end is electrically connected to the battery monitoring unit.

[0027] In the above technical solution, the first end of the conductive member is welded or bonded to the electrode lead, which can improve the stability of the connection between the first end of the conductive member and the electrode lead, and the second end is electrically connected to the battery monitoring unit, so that the first end of the conductive member can sample the voltage of the connected soft-pack battery cell, and transmit the sampled voltage information to the battery monitoring unit through the second end, ensuring the accuracy and stability of the sampling. The conductive member can achieve voltage sampling while achieving electrical connection, which can save the number of components and installation space.

[0028] According to some embodiments of the present application, optionally, the electrical component includes an electrical connector, the battery device includes a first adapter wire and a second adapter wire, the first adapter wire and the second adapter wire are both connected to the electrical connector, the second ends of the plurality of conductive members are connected to the electrical connector through the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the battery monitoring unit.

[0029] In the above technical solution, the second ends of the multiple conductive members are connected to the electrical connector via the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the battery monitoring unit, so that the multiple conductive members are aggregated and then connected to the battery monitoring unit, thereby simplifying the electrical connection lines between the conductive members and the battery monitoring unit, saving installation space while also facilitating identification, assembly and maintenance.

[0030] According to some embodiments of the present application, optionally, an end of the second adapter wire away from the electrical connector is connected to a first connector, the battery monitoring unit is provided with a second connector, and the first connector is plugged into the second connector.

[0031] In the above technical solution, the end of the second adapter wire away from the electrical connector is connected to the first connector, and the battery monitoring unit is provided with a second connector. The first connector is plugged into the second connector, so that the circuit connection or disconnection between the battery monitoring unit and the second adapter wire can be achieved by plugging and unplugging the first connector or the second connector, which is easy to operate and is conducive to improving the assembly efficiency of the battery device.

[0032] According to some embodiments of the present application, optionally, the conductive member is at least one of a flexible circuit board and a wiring harness.

[0033] In the above technical solution, the conductive part is at least one of a flexible circuit board and a wiring harness, and the conductive part has good flexibility, so that the conductive part is arranged in the irregular structural space between the ends of multiple packaging bags and the electrical parts, has good adaptability, and is conducive to saving the installation space of the conductive part.

[0034] According to some embodiments of the present application, optionally, the electrical component includes a battery monitoring unit, all the soft-pack battery cells are arranged in series, and the battery monitoring unit collects parameters of the soft-pack battery cells through a sampling part connected to the electrode leads.

[0035] In the above technical solution, by connecting all the soft-pack battery cells in series, the battery device can have a higher output voltage, and all the soft-pack battery cells are connected in series to form a unidirectional current path, thereby facilitating the sampling unit to collect the parameters of the soft-pack battery cells, and also helping to simplify the algorithm for the battery management system to process the collected soft-pack battery cell parameters.

[0036] According to some embodiments of the present application, optionally, on the current path, the number of soft-pack battery cells between at least two adjacent sampling parts is greater than or equal to two.

[0037] In the above technical solution, two adjacent sampling parts on the current path can collect parameters of the soft-pack battery cells between the two sampling parts. There are at least two adjacent sampling parts in the battery device that can collect parameters of two or more soft-pack battery cells, so that the number of sampling parts can be reduced accordingly, so that the wiring harness connected to the sampling parts can also be shortened and simplified, thereby saving installation space and reducing costs to a certain extent.

[0038] According to some embodiments of the present application, optionally, on the current path, two electrode leads of the first soft-pack battery cell and the last soft-pack battery cell are both connected to a sampling part.

[0039] In the above technical solution, on the current path, the electrode leads of the first soft-pack battery cell and the last soft-pack battery cell are both connected to the sampling unit, thereby ensuring that the sampling unit can collect parameters of the first soft-pack battery cell and the last soft-pack battery cell, ensuring the comprehensiveness of the sampling, and thus facilitating improving the reliability of the management strategy of the battery management system.

[0040] According to some embodiments of the present application, optionally, on the current path, between the first soft-pack battery cell and the last soft-pack battery cell, there are two soft-pack battery cells between two adjacent sampling parts.

[0041] In the above technical solution, on the current path, between the first soft-pack battery cell and the last soft-pack battery cell, there are two soft-pack battery cells between two adjacent sampling parts. Compared with separately setting a sampling part at both ends of each soft-pack battery cell, the number of sampling parts is reduced, and the sampling part can be connected to the battery monitoring unit with a shorter wiring harness, thereby saving installation space and reducing costs to a certain extent.

[0042] According to some embodiments of the present application, optionally, at least one electrode lead of each soft-pack battery cell is electrically connected to the battery monitoring unit through a conductive member, and the conductive member includes a first end and a second end opposite to each other, and the first end forms a sampling portion.

[0043] In the above technical solution, at least one electrode lead of each soft-pack battery cell is electrically connected to the battery monitoring unit through a conductive member, and the second end of the conductive member forms a sampling portion and is connected to the electrode lead, so that the battery monitoring unit can obtain the parameters of each soft-pack battery cell through the sampling portion and the conductive member, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy.

[0044] According to some embodiments of the present application, optionally, in the first direction, a reinforcing partition is sandwiched between at least two adjacent soft-pack battery cells, the reinforcing partition is connected to the packaging bag, and the hardness of the reinforcing partition is greater than the hardness of the packaging bag.

[0045] In the above technical solution, by arranging a reinforcing partition between adjacent soft-pack battery cells and making the hardness of the reinforcing partition greater than the hardness of the flexible shell, it is convenient to group multiple soft-pack battery cells, and the overall stiffness of the soft-pack battery group formed by the grouping of multiple soft-pack battery cells can be improved, thereby facilitating the installation of the soft-pack battery group formed by the grouping of multiple soft-pack battery cells and reducing the deformation of the soft-pack battery cells after grouping.

[0046] According to some embodiments of the present application, optionally, the thickness of the reinforcing partition is smaller than the thickness of the soft-pack battery cell.

[0047] In the above technical solution, by making the thickness of the reinforcing partition smaller than the thickness of the soft-pack battery cell, the overall stiffness of the group of multiple soft-pack battery cells can be improved while reducing the space occupied by the reinforcing partition, especially reducing the space occupied by the reinforcing partition in the thickness direction of the soft-pack battery cell, so that the overall energy density of the battery device is higher.

[0048] According to some embodiments of the present application, optionally, the reinforcing partition is a metal plate.

[0049] In the above technical solution, by setting the reinforcing partition to an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate and other materials, the reinforcing partition can have higher strength and hardness, thereby better improving the overall stiffness of a group of multiple soft-pack battery cells and better reducing the deformation of the grouped soft-pack battery cells.

[0050] According to some embodiments of the present application, optionally, the reinforcing partition is a heat conductive member and is thermally connected to the packaging bag.

[0051] In the above technical solution, by setting the reinforced partition as a heat conductor and thermally connecting it to the packaging bag, the reinforced partition can enhance the overall stiffness of the soft-pack battery cells after grouping, and at the same time, the reinforced partition can have a thermal management function. Through the heat exchange between the reinforced partition and the soft-pack battery cells, the temperature of the soft-pack battery cells can be adjusted so that the soft-pack battery cells operate within a suitable temperature range.

[0052] According to some embodiments of the present application, optionally, the reinforced partition is a solid structure.

[0053] In the above technical solution, by setting the reinforcing partition as a solid structure, the reinforcing partition can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition is small, which is beneficial for the soft-pack battery cell group as a whole to have better strength and rigidity while having a higher volume energy density as a whole.

[0054] According to some embodiments of the present application, optionally, a cavity is formed in the reinforced partition.

[0055] In the above technical solution, by setting a cavity in the reinforcing partition, while the reinforcing partition plays a role in enhancing the overall stiffness of the soft-pack battery cells after grouping, the cavity in the reinforcing partition can absorb the expansion and deformation of the soft-pack battery cells. The cavity in the reinforcing partition can provide a buffer for the deformation of adjacent soft-pack battery cells and is beneficial to reducing the weight of the reinforcing partition.

[0056] According to some embodiments of the present application, optionally, the cavity includes a heat exchange channel for the flow of a heat exchange medium.

[0057] In the above technical solution, at least part of the cavity in the reinforced partition constitutes a heat exchange channel. When the heat exchange medium flows through the heat exchange channel in the reinforced partition, the heat exchange medium can exchange heat with the soft-pack battery cell, thereby effectively adjusting the temperature of the soft-pack battery cell.

[0058] According to some embodiments of the present application, optionally, the reinforcing partition includes a connecting portion protruding from the packaging bag along the second direction, and the connecting portion is located on a side of the electrode lead facing away from the electrical component.

[0059] In the above technical solution, by making the end of the reinforcing partition along the second direction protrude from the packaging bag of the soft-pack battery cell and connected to the box body, the reinforcing partition is clamped between multiple soft-pack battery cells and grouped with multiple soft-pack battery cells to form a soft-pack battery cell group, and the overall hardness of the reinforcing partition is greater than that of the packaging bag of the soft-pack battery cell, so that the soft-pack battery cell group as a whole has better strength and rigidity.

[0060] According to some embodiments of the present application, optionally, in the first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the soft-pack battery cell is accommodated in a space enclosed by the connecting plate and the two reinforcing partitions.

[0061] In the above technical solution, two adjacent reinforcing partitions are connected by a connecting plate, and the soft-pack battery cell is accommodated in the space surrounded by the connecting plate and the two reinforcing partitions, thereby improving the strength of the reinforcing partition and further increasing the installation reliability and stability of the soft-pack battery cell.

[0062] According to some embodiments of the present application, optionally, two adjacent reinforcing partitions in the first direction are formed into an integral structure with the connected connecting plate.

[0063] In the above technical solution, two adjacent reinforcing partitions in the first direction and a connecting plate connected between the two reinforcing partitions are formed into an integrated structure, thereby further improving the strength of the reinforcing partitions and increasing the installation reliability and structural stability of the soft-pack battery cell.

[0064] According to some embodiments of the present application, optionally, the electrode leads of two adjacent soft-pack battery cells are directly connected.

[0065] In the above technical solution, by directly connecting the electrode leads of two adjacent soft-pack battery cells in the soft-pack battery cell group, the electrical connection devices between the soft-pack battery cells can be omitted or reduced, the number of parts of the soft-pack battery cell group can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the soft-pack battery cell group, and because the electrical connection devices between the soft-pack battery cells are omitted or reduced, the cost can also be reduced.

[0066] According to some embodiments of the present application, optionally, electrode leads of two adjacent soft-pack battery cells are connected by welding.

[0067] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells in the soft-pack battery cell group are connected by welding, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells in the soft-pack battery cell group, making the connection method of the electrode leads of two adjacent soft-pack battery cells in the soft-pack battery cell group simple and reliable.

[0068] According to some embodiments of the present application, optionally, electrode leads of two adjacent soft-pack battery cells are directly connected by a conductive adhesive.

[0069] In the above technical solution, the electrode leads of two adjacent soft-pack battery cells in the soft-pack battery cell group are connected by conductive glue, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells in the soft-pack battery cell group, making the connection method of the electrode leads of two adjacent soft-pack battery cells in the soft-pack battery cell group simple and reliable.

[0070] According to some embodiments of the present application, optionally, a plurality of soft-pack battery cells are bonded and matched in sequence along a first direction, and the soft-pack battery cell has a first surface and a second surface, and the second surface is adjacent to the first surface;

[0071] The battery device includes a glue layer and a blocking member. The glue layer is arranged on one side of the soft-pack battery group located on the first surface and is used to adhere multiple soft-pack battery cells to the box body. The blocking member is at least located between at least one soft-pack battery cell at both ends of the soft-pack battery cell group in the first direction and the glue layer, and is used to prevent the glue layer from overflowing from the first surface of the soft-pack battery cell to the second surface of the corresponding soft-pack battery cell.

[0072] In the above technical solution, by arranging a blocking member at least between at least one soft-pack battery cell and the glue layer at both ends of the soft-pack battery cell group in the first direction, the risk of glue overflowing from the first side of the soft-pack battery cell to the second side during glue coating can be reduced during the assembly stage of the battery device, and the probability of glue overflow forming a hard structure on the second side of the soft-pack battery cell can be reduced, thereby improving the problem of local stress concentration on the surface of the soft-pack battery cell, reducing the risk of damage to the soft-pack battery cell, and enhancing the insulation between the first side of the soft-pack battery cell and the box body, which is beneficial to improving the reliability of the soft-pack battery cell and the reliability of the battery device.

[0073] According to some embodiments of the present application, optionally, the blocking member at least covers a corner position of the corresponding soft-pack battery cell.

[0074] In the above technical solution, the blocking member covers the corner position of the corresponding soft-pack battery cell, which can effectively reduce the probability of glue accumulation at the corner position of the outermost soft-pack battery cell, and play a better role in preventing glue overflow. At the same time, it can also reduce the size of the blocking member and reduce the amount of material used. It can also leave a suitable size of space on the first side for glue coating, thereby improving the bonding firmness of the soft-pack battery cell and the box body.

[0075] According to some embodiments of the present application, optionally, the blocking member at least covers an edge position of the corresponding soft-pack battery cell in the first direction.

[0076] In the above technical solution, the blocking member of the above solution can reduce the risk of glue overflowing to the second surface of the larger area of ​​the soft-pack battery cell, thereby further reducing the risk of glue overflowing to form a hard structure at the edge of the soft-pack battery cell group, and further reducing the risk of damage to the soft-pack battery cell, thereby improving the reliability of the battery device.

[0077] According to some embodiments of the present application, optionally, a blocking member is provided between two adjacent soft-pack battery cells along the first direction.

[0078] In the above technical solution, a blocking member is provided between two adjacent soft-pack battery cells, which can block the glue that may overflow from the two opposite first surfaces of the two adjacent soft-pack battery cells during glue coating, thereby reducing the number of blocking members, streamlining components, and saving occupied space.

[0079] According to some embodiments of the present application, optionally, the soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

[0080] In the above technical solution, the soft-pack battery cell adopts the above types to provide more options for the design of the battery device to meet different usage requirements. Among them, the soft-pack battery cell is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity and small internal resistance; the soft-pack battery cell is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery cell is a solid-state battery cell, which has the advantages of high energy density and high reliability, light weight and good high and low temperature performance.

[0081] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery device according to any of the above embodiments, and the battery device is used to provide electrical energy.

[0082] In the electrical device of the technical solution of the present application, the electrode lead is located at the end of the soft-pack battery cell, and multiple electrode leads are arranged in sequence along a first direction and form a accommodating gap with the end of the soft-pack battery cell in a third direction. The electrode lead electrical components are connected to the electrode leads and arranged in the accommodating gap, so that the structure of the battery device is more compact and space-saving, which helps to improve the energy density of the battery device.

[0083] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0085] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0086] Figure 2 A partial structural schematic diagram of a battery device according to some embodiments of the present application;

[0087] Figure 3 for Figure 2 An enlarged schematic diagram of part A;

[0088] Figure 4 A schematic diagram of the three-dimensional structure of a soft-pack battery cell in some embodiments of the present application;

[0089] Figure 5 This is a schematic structural diagram of a soft-pack battery cell according to some embodiments of the present application, viewed from a first direction;

[0090] Figure 6 A cross-sectional schematic diagram of a soft-pack battery cell according to some embodiments of the present application;

[0091] Figure 7 A schematic diagram of the combination of a soft-pack battery cell and an electrical component in some embodiments of the present application;

[0092] Figure 8 A schematic diagram of a three-dimensional structure of a battery device according to some embodiments of the present application;

[0093] Fig. 9 A schematic diagram of the structure of a battery device without a top cover according to some embodiments of the present application;

[0094] Fig.10 Schematic diagram of the structure of the battery device without the top cover in some other embodiments of the present application;

[0095] Fig.11 for Fig.10 An enlarged schematic diagram of part B;

[0096] Fig.12 A schematic diagram of the current path of soft-pack cells connected in series in some embodiments of the present application;

[0097] Fig.13 A schematic diagram of current paths of soft-pack cells connected in series in some other embodiments of the present application;

[0098] Fig.14 A schematic diagram of the connection of electrical components in some embodiments of the present application;

[0099] Fig.15 This is a schematic diagram of the structure of a soft-pack battery cell group in some embodiments of the present application;

[0100] Fig.16 for Fig.15 An enlarged schematic diagram of part C;

[0101] Fig.17 A schematic cross-sectional view of a reinforced partition according to some embodiments of the present application;

[0102] Fig.18 A schematic diagram of a combination of a reinforced separator and a single soft-pack battery cell in some embodiments of the present application;

[0103] Fig.19 is a schematic diagram of a soft-pack battery cell group according to some embodiments of the present application;

[0104] Fig. 20 yes Fig.19 The front view of the soft pack battery pack;

[0105] Fig.21 yes Fig. 20 A magnified view of part D in the middle;

[0106] Fig. 22 An exploded view of the structure of a battery device provided in another embodiment of the present application;

[0107] Fig.23 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0108] Fig.24 A bottom view of a local structure of a battery device provided in some embodiments of the present application Figure 1 ;

[0109] Fig.25 A bottom view of a partial structure of a battery device provided in an embodiment of the present application Figure 2 .

[0110] The reference numerals in the specific implementation manner are as follows:

[0111] 1000-vehicle; 100-battery device; 200-controller; 300-motor;

[0112] 10-box; 10a-accommodation space; 101-box body; 102-heat exchange plate; 11-top cover; 12-bottom plate; 111-box wall; 17-bracket; 171-sub-bracket; 20-soft-pack battery cell group; 201-accommodation gap; 30-soft-pack battery cell; 31-packaging bag; 310-corner space; 311-first surface; 312-second surface; 33-electrode lead; 331-lead-out portion; 34-glue layer; 35-resistance Blocking member; 351-first part; 352-second part; 40-reinforced partition; 41-connecting part; 42-cavity; 43-heat exchange channel; 44-connecting plate; 60-electrical part; 61-battery monitoring unit; 611-second connector; 62-electrical connector; 70-conductive member; 71-first end; 72-second end; 81-sampling part; 91-first adapter wire; 92-second adapter wire; 921-first connector. DETAILED DESCRIPTION

[0113] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0115] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0116] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0117] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0118] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0119] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0120] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0121] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0122] With the expansion of the market and the development of technology, users have increasingly stringent requirements for the performance and safety of power batteries. Power batteries often need to be frequently charged and discharged during operation, and the charging and discharging process is prone to problems such as excessive current or excessive temperature, which in turn affects safety in use. By collecting the voltage or current parameters of the battery and passing them to the Battery Management System (BMS), providing a reference for the control strategy of the battery management system, and then providing timely and effective protection, it has become an important way to ensure the safety of battery use.

[0123] In the related art, the battery device usually includes a plurality of soft-pack cells, and the plurality of soft-pack cells are arranged in a box. In order to collect the voltage or current of the soft-pack cells for reference by the battery management system, the end of each soft-pack cell is electrically connected to the battery monitoring unit. In order to ensure the overall grouping efficiency, the plurality of soft-pack cells can all be directly bonded to the box through the adhesive layer. However, the plurality of soft-pack cells are electrically connected to the battery monitoring unit in a many-to-one form, resulting in a large space occupied by connecting components such as conductive wires, connectors, and the battery monitoring unit in the box, thereby limiting the improvement of the energy density of the battery device.

[0124] In view of the above situation, the present application provides a battery device, which includes a soft-pack battery cell group and an electrical component. The soft-pack battery cell group includes a plurality of soft-pack battery cells arranged along a first direction, and the electrode lead of each soft-pack battery cell is arranged at the end of the packaging bag along a second direction. The electrode leads of the plurality of soft-pack battery cells on the same side are arranged in sequence along the first direction, and the electrode leads form a receiving gap with the end of the soft-pack battery cell group in a third direction. The electrical component is arranged in the receiving gap and is electrically connected to the electrode lead. Among them, the first direction, the second direction and the third direction are arranged at angles to each other. Such a design enables the electrical component to be connected to each soft-pack battery cell and utilize the receiving gap between the electrode lead and the end of the soft-pack battery cell group, making the structure more compact, thereby saving installation space and helping to improve the energy density of the battery device.

[0125] In the embodiment of the present application, the soft-pack battery cell may be a secondary battery. A secondary battery refers to a battery that can be continuously used by activating the active material by charging after the battery cell is discharged.

[0126] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may include multiple soft-pack battery cell groups for providing voltage and capacity. The soft-pack battery cell group (Battery Cell Assembly) may include multiple soft-pack battery cells, and the multiple soft-pack battery cells are connected in series, in parallel, or in mixed connection through a busbar component.

[0127] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of soft-pack battery cells.

[0128] As an example, the soft-pack battery cell group may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of soft-pack battery cells to form an independent module. As an example, the battery module may be formed by engaging a plurality of soft-pack battery cells with a mounting plate with a slot.

[0129] In some embodiments, the battery device may be a battery pack, which includes a case and one or more soft-pack battery cell groups, wherein the soft-pack battery cell groups are accommodated in the case.

[0130] As an example, the soft-pack battery cell group may be a battery module, and the soft-pack battery cell group may be accommodated in the box by fixing the battery module in the box.

[0131] As an example, the soft-pack battery cell group may also be accommodated in the box by directly fixing a plurality of soft-pack battery cells to the box.

[0132] The soft-pack battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0133] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using soft-pack batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0134] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0135] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0136] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0137] Please refer to Figures 2 to 3The battery device 100 includes a case 10, a soft-pack battery group 20 and an electrical component 60, wherein the soft-pack battery group 20 includes a plurality of soft-pack battery cells 30 arranged along a first direction, each of the soft-pack battery cells 30 is bonded to the case 10, and includes a packaging bag 31 and an electrode lead 33, the electrode lead 33 is arranged at the end of the packaging bag 31 along the second direction, and all the electrode leads 33 of the plurality of soft-pack battery cells 30 of the soft-pack battery group 20 on the same side are arranged in sequence along the first direction, and along the third direction, the plurality of electrode leads 33 and the end of the soft-pack battery group 20 form a receiving gap 201; the electrical component 60 is arranged in the receiving gap 201 and is electrically connected to the electrode lead 33; the first direction, the second direction and the third direction are arranged at angles to each other.

[0138] The first direction may refer to the e1 direction in the drawings, the second direction may refer to the e2 direction in the drawings, and the third direction may refer to the e3 direction in the drawings. In some implementations of the present application, the first direction, the second direction, and the third direction may be arranged perpendicularly to each other.

[0139] The box 10 has a containing space 10a, and the soft-pack battery group 20 is arranged in the containing space 10a. The containing space 10a may refer to a space defined inside the box 10 for containing the soft-pack battery group 20 and other devices. The shape of the box 10 may be, but not limited to, a rectangular parallelepiped, a cube, a cylinder, etc. The material of the box 10 may be, but not limited to, a metal material or a non-metal material. The metal material may include, but not limited to, aluminum alloy, stainless steel, etc., and the non-metal material may include, but not limited to, plastic, carbon fiber composite material, etc.

[0140] The soft-pack battery cell 30 refers to a battery cell whose outer shell is made of a soft material. The soft-pack battery cell 30 includes an electrode assembly (not shown) that can generate electrical energy, and the electrode assembly can be contained in a packaging bag 31. The electrode lead 33 is electrically connected to the electrode assembly and at least partially exposed outside the packaging bag 31. The packaging bag 31 is a flexible structure, for example, the packaging bag 31 can be made of an aluminum-plastic film.

[0141] The electrode assembly consists of a positive electrode sheet, a negative electrode sheet and a separator. The soft-pack battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0142] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0143] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0144] The material of the isolation film can be PP (polypropylene) or PE (polyethylene), etc.

[0145] The electrode assembly of the soft-pack battery 30 can be a wound electrode assembly or a laminated electrode assembly. The electrode assembly includes a pole piece (not shown) and a pole ear (not shown). The electrode assembly can be formed by winding the pole piece, or by stacking the pole pieces. The electrode lead 33 of the soft-pack battery 30 is connected to the pole ear, and at least part of the electrode lead 33 is located outside the packaging bag 31 as a lead-out structure of the electrode assembly. The electrode lead 33 can be used to electrically connect the soft-pack battery 30 with other soft-pack batteries 30 or other components.

[0146] Optionally, the portion of the electrode lead 33 exposed outside the packaging bag 31 is a lead-out portion, and the lead-out portion is formed in a sheet shape.

[0147] The soft-pack battery cell 30 is difficult to maintain a stable solid outer contour because the outer packaging bag 31 is a flexible structure. The outer contour of the packaging bag 31 can be approximately a flat rectangular parallelepiped shape. Among the length direction, width direction and thickness direction of the soft-pack battery cell, the size of the soft-pack battery cell in the length direction of the soft-pack battery cell is the largest, and the size of the soft-pack battery cell in the thickness direction of the soft-pack battery cell is the smallest. For example, the thickness direction of the soft-pack battery cell can refer to the e1 direction in the accompanying drawings, the length direction of the soft-pack battery cell can refer to the e2 direction in the accompanying drawings, and the width direction of the soft-pack battery cell can refer to the e3 direction in the accompanying drawings.

[0148] The soft-packed battery cells 30 can be arranged in a posture that the thickness direction, length direction and width direction of the packaging bag 31 are respectively parallel to the first direction, the second direction and the third direction, and the plurality of soft-packed battery cells 30 are arranged in sequence along their thickness direction. That is, the size of the outer contour of the packaging bag 31 in the second direction (the length of the packaging bag 31) can be significantly larger than the size (width and thickness) in the first direction and the third direction, and the size of the outer contour of the packaging bag 31 in the third direction (width) is also larger than the size (thickness) in the first direction.

[0149] Reference Figures 3 to 5, the electrode lead 33 may be provided at both ends of the soft-pack battery cell 30 along the second direction. The electrode lead 33 may at least partially protrude from the end of the packaging bag 31 along the second direction. The portion of the plurality of electrode leads 33 protruding from the packaging bag 31 in the third direction and the interval between one end of the soft-pack battery cell group 20 along the third direction forms a receiving gap 201. In the third direction, the distance between the electrode lead 33 and the end of the soft-pack battery cell group 20, that is, the width of the receiving gap 201, is greater than or equal to the size of the electrical component 60 in the third direction.

[0150] Optionally, refer to Figure 7 The distance that the electrode lead 33 protrudes from the end of the packaging bag 31 along the second direction is greater than or equal to the size of the electrical component 60 in the second direction.

[0151] It is easy to understand that the electrode lead 33 at least partially protrudes from the end of the packaging bag 31, so that the space occupied by the soft-pack battery cell 30 in the battery device 100 is further expanded outward on the basis of the volume of the packaging bag 31, and the accommodation gap 201 formed by the electrode lead 33 and the end of the soft-pack battery cell 30 in the third direction is included in the space occupied by the soft-pack battery cell 30. Compared with the technology in which the electrical component 60 is arranged outside the space occupied by the soft-pack battery cell 30, the electrical component 60 provided in the embodiment of the present application is arranged in the accommodation gap 201, that is, the electrical component 60 is installed in the space occupied by the soft-pack battery cell 30, so that the structure is more compact, the space utilization rate is improved, and the capacity density of the battery device 100 is improved.

[0152] Optionally, refer to Fig. 9 In the same soft-pack battery cell group 20, all electrode leads 33 on the same side can be arranged in sequence along the first direction and aligned along the third direction. That is, the portions of the electrode leads 33 protruding from the packaging bag 31 in the third direction are spaced equidistant from the ends of the soft-pack battery cell group 20 in the third direction.

[0153] The electrical component 60 may be directly connected to the electrode lead 33 , or may be indirectly connected to the electrode lead 33 via a conductive component 70 such as a wire or a connector. Each of the soft-pack cells 30 in the battery device 100 may be electrically connected to the electrical component 60 .

[0154] In the battery device 100 of the embodiment of the present application, the multiple soft-pack battery cells 30 of the soft-pack battery group 20 are arranged along the first direction, and the electrode leads 33 are provided at the ends of the soft-pack battery cells 30 along the second direction. All the electrode leads 33 of the multiple soft-pack battery cells 30 on the same side are arranged in sequence along the first direction, and all the electrode leads 33 on this side form a accommodating gap 201 together with the ends of the soft-pack battery group 20 in the third direction. The electrical component 60 is arranged in the accommodating gap 201 and is connected to the electrode lead 33, so that the electrical component 60 can use the accommodating gap 201 as an installation space, so that the structure of the battery device 100 is more compact and space-saving, which helps to improve the energy density of the battery device 100.

[0155] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the electrical component 60 includes a battery monitoring unit 61 and / or an electrical connector 62 .

[0156] Specifically, the battery monitoring unit 61 is used to collect parameters such as voltage, current, temperature, etc. of a single or multiple soft-pack battery cells 30. Accordingly, the battery monitoring unit 61 may include detection units such as a voltage sensor, a current sensor, and / or a temperature sensor. The battery monitoring unit 61 also includes a slave controller 200 (CSC, Cell Supervision Circuit), and is used to transmit the parameters of the soft-pack battery cell 30 to the main control board (BMU, Battery Management Unit).

[0157] Exemplarily, the electrical component 60 includes a battery monitoring unit 61 , and the battery monitoring unit 61 is electrically connected to the soft-pack battery cell group 20 .

[0158] Reference Figure 3 In a specific embodiment, the electrical component 60 includes a battery monitoring unit 61 and an electrical connector 62. The battery monitoring unit 61 is disposed in the accommodation gap 201 formed by the electrode leads 33 on both sides of the soft-pack battery cell 30 in the second direction. In this embodiment, the battery device 100 includes a second adapter cable 92. One end of the second adapter cable 92 is connected to the battery monitoring unit 61, and the other end is connected to the electrical connector 62, so as to realize electrical connection between the battery monitoring unit 61 and the electrical connector 62.

[0159] In this embodiment, optionally, the battery monitoring unit 61 and the electrical connector 62 are respectively located in the accommodation gap 201 formed by the upper side and the lower side of the electrode lead 33 along the third direction.

[0160] Reference Figure 7The electrical component 60 includes a battery monitoring unit 61 and an electrical connector 62. The battery monitoring unit 61 and the electrical connector 62 are connected together and are accommodated in the accommodation gap 201. The soft-pack battery cell 30 is electrically connected to the electrical connector 62 and is electrically connected to the battery monitoring unit 61 through the electrical connector 62, so that the battery monitoring unit 61 can receive the parameters of the soft-pack battery cell 30.

[0161] In this embodiment, optionally, the electrical connector 62 is connected to the battery control unit by plugging, thereby improving connection reliability and saving installation space.

[0162] In the above technical solution, the electrical component 60 includes a battery monitoring unit 61 and / or an electrical connector 62. The electrical component 60 can be electrically connected to the electrode lead 33 through one of the battery monitoring unit 61 and the electrical connector 62. The battery monitoring unit 61 and / or the electrical connector 62 can be electrically connected to the soft-pack battery cell 30 through the electrode lead 33, so that the battery management system can monitor and adjust the soft-pack battery cell group 20 through the electrical component 60. In addition, the electrical component 60 can further obtain the parameters of the soft-pack battery cell 30 for the battery management system as a reference for management strategy.

[0163] Reference Figure 7 According to some embodiments of the present application, optionally, the electrical component 60 includes a battery monitoring unit 61 and an electrical connector 62, the electrical connector 62 is located between the electrode lead 33 and the battery monitoring unit 61, and the electrical connector 62 electrically connects the battery monitoring unit 61 and the electrode lead 33.

[0164] Specifically, the electrical connector 62 and the battery monitoring unit 61 are accommodated together in the accommodation gap 201. A plurality of electrode leads 33, the electrical connector 62 and the battery monitoring unit 61 located on the same side may be stacked along the third direction. The electrical connector 62 may be connected to the plurality of electrode leads 33 through the conductive member 70, or may be directly connected to a portion of the plurality of electrode leads 33. The electrical connector 62 may be connected to the battery monitoring unit 61 through an electrical connection terminal, a wiring harness or an electrical connection portion forming a mortise and tenon structure.

[0165] In the above technical solution, the electrical connector 62 is located between the electrode lead 33 and the battery monitoring unit 61 and connects the electrode lead 33 and the battery monitoring unit 61, so that the electrode leads 33 of multiple soft-pack battery cells 30 can be transferred to the battery monitoring unit 61 through the electrical connector 62, further utilizing the space of the accommodating gap 201 in the third direction, making the structure more compact, and saving the installation space required for the battery monitoring unit 61 while realizing the electrical connection between the battery monitoring unit 61 and multiple soft-pack battery cells 30.

[0166] According to some embodiments of the present application, optionally, the battery device 100 includes a main control board (not shown), and the electrical component 60 includes a battery monitoring unit 61 , and the battery monitoring unit 61 is electrically connected to the main control board.

[0167] Specifically, the main control board may be integrated with structures and electronic components that implement various control functions in the battery management system. The battery monitoring unit 61 is electrically connected to the electrode lead 33 to collect parameters such as current, voltage, and temperature of the soft-pack battery cell 30. The battery monitoring unit 61 may include a slave controller 200, and the battery monitoring unit 61 may be connected to the main control board via a communication harness to transmit the parameters of the soft-pack battery cell 30 to the main control board.

[0168] In the above technical solution, the battery device 100 includes a main control board, and the electrical component 60 includes a battery monitoring unit 61. The battery monitoring unit 61 is electrically connected to the main control board, and the battery monitoring unit 61 can collect parameters of the soft-pack battery cell 30, so that the main control board can accurately and reliably obtain the parameters of the soft-pack battery cell 30, and adjust the control strategy of the battery device 100 in time according to the status of the soft-pack battery cell 30.

[0169] See also Figure 7-10 According to some embodiments of the present application, optionally, the box body 10 includes a bottom plate 12 , and the accommodating gap 201 is located between the bottom plate 12 and the electrode lead 33 .

[0170] As an example, the box 10 may include a first box and a second box. The first box and the second box are buckled together to form a closed accommodation space 10a inside the box 10 to accommodate the soft-pack battery cell group 20. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover 11 or a bottom plate 12.

[0171] As an example, the box body 10 may include a top cover 11, a frame and a bottom plate 12. The top cover 11 and the bottom plate 12 are respectively connected to the frame, so that a closed space is formed inside the box body 10 to accommodate the soft-pack battery cell group 20.

[0172] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0173] Optionally, the top cover 11 and the bottom plate 12 are opposite to each other in the third direction, the soft-pack battery group 20 is located in the area where the top cover 11 and the bottom plate 12 are opposite to each other, and one end of the soft-pack battery group 20 in the third direction abuts against the top cover 11 or is arranged close to the top cover 11, and the other end of the soft-pack battery group 20 in the third direction abuts against the bottom plate 12. The electrode lead 33 and the end of the soft-pack battery group 20 abutting against the bottom plate 12 in the third direction form a receiving gap 201. The electrode lead 33 protrudes from the end of the packaging bag 31 in the second direction, and the electrode lead 33 and the bottom plate 12 are opposite and spaced in the third direction, jointly limiting the boundary range of the receiving gap 201. In this embodiment, the soft-pack battery group 20 can be fixedly connected to the bottom plate 12.

[0174] Furthermore, in the third direction, the electrode lead 33 is arranged close to the top cover 11, that is, the distance between the electrode lead 33 and the end of the soft-pack battery group 20 close to the top cover 11 is smaller than the distance between the electrode lead 33 and the end of the soft-pack battery group 20 close to the bottom plate 12, so as to increase the spatial range of the accommodating gap 201.

[0175] In the above technical solution, the battery device 100 accommodates the soft-pack battery cell group 20 through the box body 10, and the box body 10 can provide support and protection for the soft-pack battery cell 30. The accommodating gap 201 is located between the bottom plate 12 of the box body 10 and the electrode lead 33, so that the boundary range of the accommodating gap 201 in the third direction is relatively clear, and the bottom plate 12 can provide support for the electrical component 60 in the accommodating gap 201, so that the electrical component 60 can be installed more stably in the accommodating gap 201.

[0176] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the battery device 100 includes a bracket 17 connected to the box body 10 , and the electrical component 60 is installed on the bracket 17 .

[0177] Specifically, the bracket 17 is located on at least one side of the soft-pack battery group 20 along the second direction, and the bracket 17 may be located on one side of the soft-pack battery group 20 along the second direction, or the bracket 17 may be located on both sides of the soft-pack battery group 20 along the second direction. The electrical component 60 may be connected to the bracket 17 by at least one of welding, screwing, riveting, snap connection, adhesive connection, fastener connection, etc. The electrical component 60 and the bracket 17 may be fixedly connected in a detachable form.

[0178] Optionally, the bracket 17 includes a plurality of sub-brackets 171, and the plurality of sub-brackets 171 of the bracket 17 may be arranged along the first direction, and two adjacent sub-brackets 171 may be connected. The plurality of sub-brackets 171 may be formed independently, for example, two adjacent sub-brackets 171 may be connected by welding or by structural adhesive or by fasteners; or, the plurality of sub-brackets 171 may be formed integrally.

[0179] Two adjacent sub-brackets 171 may form a through installation space along the extension direction (eg, the first direction) of the electrical component 60 to accommodate the electrical component 60 .

[0180] In the above technical solution, the bracket 17 is connected to the box body 10, and the electrical component 60 is installed on the bracket 17, so that the electrical component 60 can be connected to the box body 10 through the bracket 17, thereby increasing the installation stability and reliability of the electrical component 60, and is beneficial to improving the overall rigidity and strength of the battery device 100.

[0181] According to some embodiments of the present application, optionally, the electrical component 60 is bonded to the box wall 111 of the box body 10 .

[0182] Specifically, the box wall 111 of the box body 10 encloses and forms the accommodating space 10a, and the box wall 111 can be a wall surface on any side of the box body 10 in the first direction, the second direction, or the third direction. The electrical component 60 is arranged in the accommodating gap 201, and at least one side surface faces the box body 10. The surface of the electrical component 60 facing the box body 10 can be bonded to the inner wall surface of the box body 10.

[0183] Exemplarily, the electrode lead, the end of the packaging bag 31 along the second direction and the bottom plate together form a receiving gap 201. The electrical component 60 is received in the receiving gap 201, and the electrical component 60 is located between the electrode lead and the bottom plate in the third direction, and between the side box wall of the box body 10 and the packaging bag 31 in the second direction. The electrical component 60 may be directly connected to the bottom plate, and / or the electrical component 60 may be directly connected to the box wall 111 of the box body 10 opposite in the second direction.

[0184] The electrical component 60 can be connected to the box wall 111 of the box body 10 by means of structural adhesive, glue, adhesive film, etc.

[0185] In the above technical solution, the electrical component 60 is bonded to the box wall 111 of the box body 10 so that the electrical component 60 and the box wall 111 of the box body 10 are connected as a whole, which is beneficial to the integration of the electrical component 60 and the box body 10, saves occupied space, and facilitates the assembly of internal components of the battery device 100, which helps to provide insulation isolation protection between the electrical component 60 and the box body 10.

[0186] Reference Figure 2 According to some embodiments of the present application, optionally, the electrical component 60 includes a battery monitoring unit 61, and the length of the battery monitoring unit 61 extends along the first direction.

[0187] Specifically, combined Figure 7The accommodation gap 201 is formed in the space between the electrode lead 33 and the bottom plate 12 along the third direction. The multiple electrode leads 33 on the same side are arranged in sequence along the first direction, so that the accommodation gap 201 formed by the electrode leads 33 on the same side extends along the first direction. The battery monitoring unit 61 is arranged in the accommodation space 10a and extends along the extension direction of the accommodation gap 201, that is, along the first direction. The outer contour of the battery monitoring unit 61 can be in the shape of a long plate or a long strip.

[0188] In the above technical solution, the length of the battery monitoring unit 61 extends along the first direction, and the accommodating gap 201 also extends along the first direction, so that the battery monitoring unit 61 can fully fill the space where the accommodating gap 201 is located, thereby improving space utilization.

[0189] Reference Figure 2 and Fig. 9 According to some embodiments of the present application, optionally, there are multiple soft-pack battery cell groups 20, and the multiple soft-pack battery cell groups 20 are arranged along the second direction, and the electrical component 60 is arranged between two groups of soft-pack battery cell groups 20 or on one side of all the soft-pack battery cell groups 20.

[0190] Specifically, the plurality of soft-packed battery cell groups 20 may be electrically connected to the electrical component 60. The number of soft-packed battery cells 30 may be two, three, or more than three. The plurality of soft-packed battery cells 30 in each soft-packed battery cell group 20 are arranged along the first direction, and the ends of the soft-packed battery cells 30 on the same side in the second direction may be flush along the second direction.

[0191] Exemplarily, the number of the soft-pack battery cell groups 20 is two, and the electrical component 60 can be disposed on one of the two opposite sides of the two soft-pack battery cell groups 20 along the second direction.

[0192] Exemplarily, there are two soft-pack battery cell groups 20, and the electrode leads 33 of the two soft-pack battery cell groups 20 on the side close to each other along the second direction form a receiving gap 201 in the third direction, and the electrical component 60 is arranged in the receiving gap 201 on the side close to each other of the two soft-pack battery cell groups 20.

[0193] Exemplarily, the number of the soft-pack battery cell groups 20 is three, and the electrical component 60 may be disposed on a side of the first or last soft-pack battery cell group 20 along the second direction away from the other soft-pack battery cell groups 20 .

[0194] Exemplarily, the number of the soft-pack battery cell groups 20 is three, and the electrical component 60 is disposed between two of the soft-pack battery cell groups 20 .

[0195] In the above technical solution, there are multiple soft-pack battery cell groups 20, which can increase the overall output voltage of the battery device 100. Along the second direction, the electrical component 60 is arranged between two groups of soft-pack battery cell groups 20 or on one side of all the soft-pack battery cell groups 20, so that the structure is more compact and space in the second direction is saved.

[0196] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the electrical component 60 includes a battery monitoring unit 61 , and at least one electrode lead 33 of each soft-pack battery cell 30 is electrically connected to the battery monitoring unit 61 through a conductive component 70 .

[0197] Specifically, two electrode leads 33 may be provided on each soft-pack battery cell 30, one of the two electrode leads 33 is a positive electrode lead, and the other is a negative electrode lead. One of the two electrode leads 33 of the soft-pack battery cell 30 is arranged on one side of the soft-pack battery cell 30 along the second direction, and the other of the two electrode leads 33 of the soft-pack battery cell 30 is arranged on the other side of the soft-pack battery cell 30 along the second direction. The size of the soft-pack battery cell 30 in the second direction may be significantly larger than the size in the first direction and the second direction, that is, the length direction of the soft-pack battery cell is parallel to the second direction; the two electrode leads 33 of the soft-pack battery cell 30 are located on opposite sides of the length direction of the soft-pack battery cell 30.

[0198] Exemplarily, among a plurality of soft-pack battery cells 30 , one of the two electrode leads 33 of each soft-pack battery cell 30 is connected to the conductive member 70 and is electrically connected to the battery monitoring unit 61 through the conductive member 70 ; the other of the two electrode leads 33 of the soft-pack battery cell 30 is not electrically connected to the conductive member 70 and the battery monitoring unit 61 .

[0199] Exemplarily, in the plurality of soft-pack battery cells 30 , the two electrode leads 33 of each soft-pack battery cell 30 are connected to the conductive member 70 and are electrically connected to the battery monitoring unit 61 through the conductive member 70 .

[0200] Illustratively, among the multiple soft-pack battery cells 30 , the electrode leads 33 at both ends of some of the soft-pack battery cells 30 are connected to the conductive member 70 and electrically connected to the battery monitoring unit 61 , while only one electrode lead 33 on other soft-pack battery cells 30 is connected to the conductive member 70 .

[0201] In the above technical solution, at least one electrode lead 33 of each soft-pack battery cell 30 is electrically connected to the battery monitoring unit 61 through the conductive member 70, so that the battery monitoring unit 61 can establish an electrical connection with each soft-pack battery cell 30, so that the battery monitoring unit 61 can monitor the status of each soft-pack battery cell 30, thereby improving the precision of monitoring and management of the battery management system.

[0202] Reference Figure 4-Figure 6 According to some embodiments of the present application, optionally, a corner space 310 is formed at a corner of the packaging bag 31 along the third direction, the conductive member 70 is at least partially located in the corner space 310, and the conductive member 70 extends along the second direction.

[0203] Specifically, the packaging bag 31 includes a first surface 311 and a second surface 312 connected to each other, the first surface 311 is parallel to the plane where the first direction and the second direction are located, and the second surface 312 is parallel to the plane where the second direction and the third direction are located. The connection between the first surface 311 and the second surface 312 is located at the end of the second surface 312 along the third direction, and forms an arc transition surface. The arc transition surface at the connection between the first surface 311 and the second surface 312 extends along the second direction, and the arc transition surface and the extension plane of the first surface 311 and the second surface 312 together define a corner space 310. The ends of the conductive member 70 can be connected to the electrical member 60 and the electrode lead 33 respectively, and the portion of the conductive member 70 between the two ends connecting the electrode lead 33 and the electrical member 60 extends along the second direction and is accommodated in the corner space 310.

[0204] Furthermore, the conductive member 70 can be attached to the outer wall surface of the packaging bag 31 in the corner space 310 .

[0205] In the above technical solution, a corner space 310 is formed at the corner of the packaging bag 31 along the third direction, and the conductive member 70 is at least partially located in the corner space 310. The conductive member 70 extends along the second direction, and the corner of the packaging bag 31 along the third direction also extends along the second direction, so that the conductive member 70 can extend in the corner space 310, thereby fully utilizing the volume space occupied by the soft-pack battery cell 30 to accommodate the conductive member 70, thereby improving space utilization.

[0206] Reference Figure 3 and Figure 7 According to some embodiments of the present application, optionally, the conductive member 70 includes a first end 71 and a second end 72 relative to each other, the first end 71 is welded or bonded to the electrode lead 33, and the second end 72 is electrically connected to the battery monitoring unit 61.

[0207] Specifically, the first end 71 and the second end 72 are two ends of the conductive member 70 that are opposite to each other along the second direction. The first end 71 can be welded to the portion of the electrode lead 33 protruding from the packaging bag 31, or can be bonded to the portion of the electrode lead 33 protruding from the packaging bag 31 through a conductive adhesive or an insulating tape. The second end 72 can be directly connected to the battery monitoring unit 61, or can be indirectly connected to the battery monitoring unit 61 through the electrical connector 62.

[0208] In the above technical solution, the first end 71 of the conductive member 70 is welded or bonded to the electrode lead 33, so that the stability of the connection between the first end of the conductive member and the electrode lead can be improved, and the second end 72 is electrically connected to the battery monitoring unit 61, so that the first end 71 of the conductive member 70 can sample the voltage of the connected soft-pack battery cell 30, and transmit the sampled voltage information to the battery monitoring unit 61 through the second end 72, thereby ensuring the accuracy and stability of the sampling. The conductive member 70 realizes voltage sampling while realizing electrical connection, which can save the number of components and installation space.

[0209] In some embodiments, the portion of the conductive member 70 between the first end 71 and the second end 72 may be fixedly connected to the packaging bag 31 by a fixing member (not shown). The number of fixing members may be multiple, and the multiple fixing members are arranged at intervals along the extension direction of the conductive member 70. The fixing members include but are not limited to adhesive tape, structural adhesive, cable ties, wire buckles, etc.

[0210] Reference Fig.14 According to some embodiments of the present application, optionally, the electrical component 60 includes an electrical connector 62, the battery device 100 includes a first adapter wire 91 and a second adapter wire 92, the first adapter wire 91 and the second adapter wire 92 are both connected to the electrical connector 62, the second ends 72 of the plurality of conductive members 70 are connected to the electrical connector 62 through the corresponding first adapter wires 91, and the end of the second adapter wire 92 away from the electrical connector 62 is connected to the battery monitoring unit 61.

[0211] It should be noted that Fig.14 The connection between the electrical connector 62, the battery monitoring unit 61 and the conductive member through the first adapter wire 91 and the second adapter wire 92 is shown in a modular form. The positions and shapes of the components in the figure are not used to indicate the actual positional relationship and the actual form. For example, the conductive member 70, the first adapter wire 91 and the second adapter wire 92 are all flexible components, which are often arranged on the surface or gap of the soft-pack battery cell 30, the electrical component 60 or the box 10 in the actual assembly process to obtain structural support and fix the position.

[0212] Specifically, there are multiple first adapters 91, and they correspond one to one with the conductive members 70. The first ends 71 ​​of the multiple conductive members 70 are respectively welded or bonded to the electrode leads 33 of the multiple soft-packed cells 30, and the second ends 72 of the multiple conductive members 70 are connected to the electrical connector 62 through the corresponding first adapters 91, so that the multiple soft-packed cells 30 are all electrically connected to the electrical connector 62. The electrical connector 62 is connected to the battery monitoring unit 61 through the second adapter 92, and the second adapter 92 can summarize the information transmitted by all the second adapters 92 connected to the electrical connector 62, so that the multiple soft-packed cells 30 are electrically connected to the battery monitoring unit 61.

[0213] In the above technical solution, the second end portions 72 of the plurality of conductive members 70 are connected to the electrical connector 62 via the corresponding first adapter wires 91, and the end of the second adapter wire 92 away from the electrical connector 62 is connected to the battery monitoring unit 61, so that the plurality of conductive members 70 are aggregated and then connected to the battery monitoring unit 61, thereby simplifying the electrical connection line between the conductive member 70 and the battery monitoring unit 61, saving installation space while also facilitating identification, assembly and maintenance.

[0214] Reference Fig.14 According to some embodiments of the present application, optionally, the end of the second adapter cable 92 away from the electrical connector 62 is connected to the first connector 921, the battery monitoring unit 61 is provided with a second connector 611, and the first connector 921 is plugged into the second connector 611.

[0215] Specifically, the first connector 921 can be a plug, and the first connector 921 forms a connecting terminal protruding from the end face of the first connector 921; the second connector 611 can be a socket, and the second connector 611 is provided with a connecting terminal recessed relative to the surface of the second connector 611, and the connecting terminal of the first connector 921 is inserted into the second connector 611 and maintains contact with the connecting terminal of the second connector 611, thereby realizing the electrical connection between the second adapter cable 92 and the battery monitoring unit 61.

[0216] For another example, the first connector 921 is plugged into the second connector 611 , which means that the second connector 611 is partially inserted into the first connector 921 .

[0217] In the above technical solution, the end of the second adapter line 92 away from the electrical connector 62 is connected to the first connector 921, and the battery monitoring unit 61 is provided with a second connector 611. The first connector 921 is plugged into the second connector 611, so that the circuit connection or disconnection between the battery monitoring unit 61 and the second adapter line 92 can be achieved by plugging and unplugging the first connector 921 or the second connector 611, which is easy to operate and is conducive to improving the assembly efficiency of the battery device.

[0218] According to some embodiments of the present application, optionally, the conductive member 70 is at least one of a flexible circuit board and a wiring harness.

[0219] For example, there are multiple conductive members 70, and the multiple conductive members 70 are flexible circuit boards. The conductive member 70 may include a first end 71 and a second end 72 extending outward from the flexible circuit board, the first end 71 is connected to the electrode lead 33, and the second end 72 is connected to the electrical member 60. Further, the conductive member 70 may be a flexible flat cable (FFC).

[0220] For example, there are multiple conductive members 70 , and all of the multiple conductive members 70 are wire harnesses.

[0221] For another example, there are multiple conductive members 70 , and the multiple conductive members 70 may include multiple flexible circuit boards and multiple wiring harnesses.

[0222] The lengths of the plurality of conductive members 70 extending along the second direction are not uniform. Some conductive members 70 are connected to the electrode leads 33 on the soft-pack battery cell 30 that are farther from the electrical member 60, and the lengths of the conductive members 70 are longer, while some conductive members 70 are connected to the electrode leads 33 on the soft-pack battery cell 30 that are closer to the electrical member 60, and the lengths of the conductive members 70 are shorter.

[0223] In the above technical solution, the conductive member 70 is at least one of a flexible circuit board and a wiring harness, and the conductive member 70 has good flexibility, so that the conductive member 70 is arranged in an irregular structural space between the ends of multiple packaging bags 31 and the electrical components 60, has good adaptability, and is conducive to saving the installation space of the conductive member 70.

[0224] Reference Fig.12 According to some embodiments of the present application, optionally, the electrical component 60 includes a battery monitoring unit 61, all the soft-pack cells 30 are arranged in series, and the battery monitoring unit 61 collects parameters of the soft-pack cells 30 through a sampling unit 81 connected to the electrode lead 33. The sampling assembly 80 includes the electrical component 60 and a plurality of sampling units 81, and the plurality of sampling units 81 are connected to the electrical component 60.

[0225] Specifically, the soft-packed battery cell 30 includes two electrode leads 33, which are respectively arranged at two ends of the packaging bag 31 along the second direction, and the two electrode leads 33 are respectively a positive electrode lead 33 and a negative electrode lead 33. The multiple soft-packed battery cells 30 in the soft-packed battery cell group 20 are arranged along the first direction, and the positive electrode lead 33 (or negative electrode lead 33) of the previous soft-packed battery cell 30 along the first direction is electrically connected to the negative electrode lead 33 (or positive electrode lead 33) of the next soft-packed battery cell 30, so that the multiple soft-packed battery cells 30 in the soft-packed battery cell group 20 are sequentially connected in series.

[0226] The battery device 100 may include a plurality of soft-packed cell groups 20, which may be arranged along the second direction and all connected in series, and a plurality of soft-packed cells 30 in each soft-packed cell group 20 are arranged in series. For example, the first two or the last two soft-packed cells 30 in the first direction of two adjacent soft-packed cell groups 20 along the second direction are connected in series.

[0227] In the above technical solution, by connecting all the soft-pack battery cells 30 in series, the battery device 100 can have a higher output voltage, and all the soft-pack battery cells 30 are connected in series to form a unidirectional current path, thereby facilitating the sampling unit 81 to collect the parameters of the soft-pack battery cells, and also helping to simplify the algorithm for the battery management system to process the collected parameters of the soft-pack battery cells 30.

[0228] Reference Fig.12 According to some embodiments of the present application, optionally, on the current path, the number of the soft-pack battery cells 30 between at least two adjacent sampling portions 81 is greater than or equal to two.

[0229] Specifically, all the soft-pack cells 30 in the battery device 100 can be arranged in series to form a unidirectional current path. A plurality of sampling parts 81 are arranged on the current path, and the sampling parts 81 can be connected to the electrode lead 33 and collect parameters such as voltage and current of the electrode lead 33 at the corresponding position in the current path. For example, along the current direction of the current path, the number of soft-pack cells 30 between two adjacent sampling parts 81 can be one, two, three, four, six or more, and the number of soft-pack cells 30 between every two adjacent sampling parts 81 can be unequal, wherein at least one group of two adjacent sampling parts 81 has two or more soft-pack cells 30.

[0230] In the above technical solution, two adjacent sampling parts 81 on the current path can collect parameters of the soft-pack battery cell 30 between the two sampling parts 81. There are at least two adjacent sampling parts 81 in the battery device 100 that can collect parameters of two or more soft-pack battery cells 30, so that the number of sampling parts 81 can be reduced accordingly, so that the wiring harness connected to the sampling part 81 can also be shortened and simplified, thereby saving installation space and reducing costs to a certain extent.

[0231] Reference Fig.12 According to some embodiments of the present application, optionally, on the current path, the two electrode leads 33 of the first soft-pack battery cell 30 and the last soft-pack battery cell 30 are both connected to the sampling part 81.

[0232] Specifically, each soft-pack battery cell 30 includes a positive electrode lead 33 and a negative electrode lead 33, and the positive electrode lead 33 and the negative electrode lead 33 can be respectively arranged at the ends of the soft-pack battery cell 30 along the second direction. In the current path, the positive electrode lead 33 of the previous soft-pack battery cell 30 is connected to the negative electrode lead 33 of the next soft-pack battery cell 30, or the negative electrode lead 33 of the previous soft-pack battery cell 30 is connected to the positive electrode lead 33 of the next soft-pack battery cell 30, so that all the soft-pack battery cells 30 are connected in series in sequence.

[0233] There are multiple sampling parts 81, wherein the first sampling part 81 is connected to the electrode lead 33 of the first soft-packed battery cell 30 along the current path that is not connected to the next soft-packed battery cell 30, and the last sampling part 81 is connected to the electrode lead 33 of the last soft-packed battery cell 30 along the current path that is not connected to the previous soft-packed battery cell 30. That is, the first sampling part 81 and the last sampling part 81 are respectively arranged at the starting point and the end point of the current path.

[0234] In the above technical solution, on the current path, the electrode leads 33 of the first soft-pack battery cell 30 and the last soft-pack battery cell 30 are both connected to the sampling unit 81, thereby ensuring that the sampling unit 81 can collect parameters of the first soft-pack battery cell 30 and the last soft-pack battery cell 30, ensuring the comprehensiveness of the sampling, and thus facilitating improving the reliability of the management strategy of the battery management system.

[0235] Reference Fig.12 According to some embodiments of the present application, optionally, on the current path, between the first soft-pack battery cell 30 and the last soft-pack battery cell 30 , there are two soft-pack battery cells 30 between two adjacent sampling parts 81 .

[0236] Specifically, on the current path, between the first soft-pack battery cell 30 and the last soft-pack battery cell 30, there are two soft-pack battery cells 30 between every two adjacent sampling parts 81, and every two adjacent sampling parts 81 can collect parameters of the two soft-pack battery cells 30 therebetween. The sampling part 81 can transmit the parameters of the soft-pack battery cells 30 to the battery management system through the battery monitoring unit 61. The battery management system can obtain the estimated parameters of each soft-pack battery cell 30 between the first soft-pack battery cell 30 and the last soft-pack battery cell 30 by performing calculations on the parameters of every two soft-pack battery cells 30 between the first and last soft-pack battery cells 30.

[0237] Illustratively, on the current path, every two adjacent sampling parts 81 can collect the total voltage of the soft-pack battery cells 30 between the two adjacent sampling parts 81, and the average voltage can be obtained according to the total voltage and the number of soft-pack battery cells 30 between the two adjacent sampling parts 81; the average voltage is used as the voltage parameter of each soft-pack battery cell 30.

[0238] Optionally, the specifications of the plurality of soft-pack battery cells 30 in the battery device 100 are the same. In this way, the accuracy of the estimated parameters of each soft-pack battery cell 30 obtained by the battery management system can be improved.

[0239] In the above technical solution, on the current path, between the first soft-pack battery cell 30 and the last soft-pack battery cell 30, there are two soft-pack battery cells 30 between two adjacent sampling parts 81. Compared with separately setting the sampling parts 81 at both ends of each soft-pack battery cell 30, the number of sampling parts 81 is reduced, and the sampling parts 81 can be connected to the battery monitoring unit 61 with a shorter wiring harness, thereby saving installation space and reducing costs to a certain extent.

[0240] Optionally, the number of soft-pack battery cells 30 between every two adjacent sampling parts 81 is not equal, wherein the number of soft-pack battery cells 30 between some groups of two adjacent sampling parts 81 is one, and the number of soft-pack battery cells 30 between other groups of two adjacent sampling parts 81 is greater than or equal to two.

[0241] For example, the first sampling portion 81 and the second sampling portion 81 on the current path are respectively connected to the two electrode leads 33 of the first soft-pack battery cell 30, and the last two sampling portions 81 are respectively connected to the two electrode leads 33 of the last soft-pack battery cell 30.

[0242] In the above technical solution, the number of soft-pack battery cells 30 between two adjacent sampling parts 81 in several groups is one, and the number of soft-pack battery cells 30 between two adjacent sampling parts 81 in other groups is greater than or equal to two, thereby shortening the wiring harness, streamlining the number of sampling parts 81, and improving the sampling accuracy.

[0243] Reference Fig.13 According to some embodiments of the present application, optionally, the number of soft-pack battery cell groups 20 is at least two, and the two electrode leads 33 of each soft-pack battery cell 30 in one soft-pack battery cell group 20 are provided with a sampling portion 81.

[0244] For example, two soft-pack battery cell groups 20 are arranged along the second direction, and every two adjacent soft-pack battery cells 30 along the second direction are connected in series, and all the soft-pack battery cells 30 in one soft-pack battery cell group 20 are connected in series in sequence through the soft-pack battery cells 30 in the other soft-pack battery cell group 20.

[0245] For example, the two electrode leads 33 of each soft-pack battery cell 30 in one of the two soft-pack battery cell groups 20 are provided with a sampling portion 81, and the two electrode leads 33 of every two soft-pack battery cells 30 in the other of the two soft-pack battery cell groups 20 that are far away from each other in the current path are provided with a sampling portion 81.

[0246] In the above technical solution, the number of soft-pack battery cell groups 20 is at least two groups, which can increase the overall output voltage of the battery device. The two electrode leads 33 of each soft-pack battery cell 30 in one group of soft-pack battery cell groups 20 are provided with a sampling part 81, and each soft-pack battery cell 30 in the group of soft-pack battery cell groups 20 can be sampled individually, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy according to the sampling parameters.

[0247] According to some embodiments of the present application, optionally, the electrode leads 33 of two adjacent soft-pack battery cells 30 arranged along the second direction are connected and provided with a sampling portion 81 .

[0248] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 arranged along the second direction are connected, which can omit or reduce the electrical connection devices between the soft-pack battery cells 30, reduce the number of components of the soft-pack battery cell group 20, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the soft-pack battery cell group 20; the electrode leads 33 connected to two adjacent soft-pack battery cells 30 arranged along the second direction are provided with a sampling part 81, which can collect parameters of the two adjacent soft-pack battery cells 30 along the second direction, improve the sampling accuracy, enrich the diversity of sampling methods, and thus improve the decision reliability of the battery management system.

[0249] Reference Figure 7 and Fig.12 According to some embodiments of the present application, optionally, at least one electrode lead 33 of each soft-pack battery cell 30 is electrically connected to the battery monitoring unit 61 through a conductive member 70, and the conductive member 70 includes a first end 71 and a second end 72 opposite to each other, and the first end 71 forms a sampling portion 81.

[0250] Specifically, each soft-pack battery cell 30 is provided with electrode leads 33 at both ends along the second direction, and the battery monitoring unit 61 is located on one side of the soft-pack battery cell group 20 along the second direction; the conductive member 70 can extend along the second direction, and the second end 72 and the first end 71 are two opposite ends of the conductive member 70 along the second direction. The first end 71 is welded or bonded to the electrode lead 33 of the soft-pack battery cell 30 to form a sampling portion 81. The number of the conductive members 70 is multiple, and the number of the conductive members 70 is less than or equal to the number of the electrode leads 33 and greater than or equal to the number of the soft-pack battery cells 30.

[0251] In the above technical solution, at least one electrode lead 33 of each soft-pack battery cell 30 is electrically connected to the battery monitoring unit 61 through the conductive member 70, and the second end 72 of the conductive member 70 forms a sampling portion 81 and is connected to the electrode lead 33, so that the battery monitoring unit 61 can obtain the parameters of each soft-pack battery cell 30 through the sampling portion 81 and the conductive member 70, thereby improving the sampling accuracy, which is beneficial for the battery management system to accurately adjust the battery management strategy.

[0252] Reference Figure 15-17 According to some embodiments of the present application, optionally, in the first direction, a reinforcing partition 40 is sandwiched between at least two adjacent soft-pack battery cells 30, the reinforcing partition 40 is connected to the packaging bag 31, and the hardness of the reinforcing partition 40 is greater than the hardness of the packaging bag 31.

[0253] For example, the reinforcing partition 40 may be a metal plate, and the flexible shell may be an aluminum-plastic film.

[0254] The reinforcing partition 40 is sandwiched between two adjacent soft-pack battery cells 30, including the following situations: a reinforcing partition 40 is provided between some adjacent soft-pack battery cells 30, and a reinforcing partition 40 is not provided between another part of adjacent soft-pack battery cells 30; or, a reinforcing partition 40 is provided between every two adjacent soft-pack battery cells 30.

[0255] The reinforcing partition 40 and the flexible shell of the soft-pack battery cell 30 can be bonded and fixed.

[0256] In the above technical solution, by arranging a reinforcing partition 40 between adjacent soft-pack battery cells 30 and making the hardness of the reinforcing partition 40 greater than the hardness of the flexible shell, it is convenient to group multiple soft-pack battery cells 30, and the overall stiffness of the soft-pack battery group 20 formed by grouping multiple soft-pack battery cells 30 can be improved, thereby facilitating the installation of the soft-pack battery group 20 formed by grouping multiple soft-pack battery cells 30 and reducing the deformation of the soft-pack battery cells 30 after grouping.

[0257] According to some embodiments of the present application, optionally, the thickness of the reinforcing separator 40 is smaller than the thickness of the soft-pack battery cell 30 .

[0258] The thickness direction of the reinforcing separator 40 is consistent with the thickness direction of the soft-pack battery cell 30. The soft-pack battery cell 30 can be arranged in a posture where its thickness direction is parallel to the first direction and substantially perpendicular to the third direction.

[0259] For example, refer to Fig.17 , the thickness of the reinforcing partition 40 is d2, the thickness of the soft-pack battery cell 30 is d3, and d2 is less than d3. For example, the range of d2 is 0.8 mm to 2.0 mm; for example, d2 is 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0260] In the above technical solution, by making the thickness of the reinforcing partition 40 smaller than the thickness of the soft-pack battery cell 30, while improving the overall stiffness of the group of multiple soft-pack battery cells 30, the space occupied by the reinforcing partition 40 can be reduced, especially the space occupied by the reinforcing partition 40 in the thickness direction of the soft-pack battery cell 30 can be reduced, so that the overall energy density of the battery device 100 is higher.

[0261] According to some embodiments of the present application, optionally, the reinforcing partition 40 is a metal plate.

[0262] In some embodiments, the reinforcing spacer 40 is an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate.

[0263] In the above technical solution, by setting the reinforcing partition 40 to be an aluminum plate, an aluminum alloy plate, a copper plate or a steel plate and other materials, the reinforcing partition 40 can have higher strength and hardness, thereby better improving the overall stiffness of the group of multiple soft-pack battery cells 30 and better reducing the deformation of the group of soft-pack battery cells 30.

[0264] According to some embodiments of the present application, optionally, the reinforcing partition 40 is a heat conductive member and is thermally connected to the packaging bag 31 .

[0265] For example, the reinforcing partition 40 and the packaging bag 31 can be thermally connected by thermal conductive adhesive. Since the reinforcing partition 40 is a thermal conductive member, the reinforcing partition 40 can transfer heat to the soft-pack battery cell 30 or absorb the heat generated by the soft-pack battery cell 30, thereby adjusting the temperature of the soft-pack battery cell 30.

[0266] In the above technical solution, by setting the reinforcing partition 40 as a heat conductor and thermally connecting it to the packaging bag 31, the reinforcing partition 40 can enhance the overall stiffness of the soft-pack battery cells 30 after being grouped, and at the same time, the reinforcing partition 40 can have a thermal management function. Through the heat exchange between the reinforcing partition 40 and the soft-pack battery cells 30, the temperature of the soft-pack battery cells 30 can be adjusted so that the soft-pack battery cells 30 operate within a suitable temperature range.

[0267] According to some embodiments of the present application, optionally, the reinforcement partition 40 is a solid structure.

[0268] For example, the reinforcing spacer 40 may be a solid aluminum plate, an aluminum alloy plate, a copper plate, or a steel plate.

[0269] In the above technical solution, by setting the reinforcing partition 40 as a solid structure, the reinforcing partition 40 can have better structural strength and rigidity, and can play an effective reinforcing role when the thickness of the reinforcing partition 40 is small, which is beneficial for the soft-pack battery cell group 20 as a whole to have better strength and rigidity while having a higher volume energy density as a whole.

[0270] According to some embodiments of the present application, optionally, a cavity 42 is formed in the reinforced partition 40 .

[0271] For example, refer to Fig.17The cavities 42 formed in the reinforcing partition 40 may be multiple and spaced apart. The multiple cavities 42 in the reinforcing partition 40 may be spaced apart along the width direction of the soft-pack battery cell 30 , and each cavity 42 may extend along the length direction of the soft-pack battery cell 30 .

[0272] In the above technical solution, by setting a cavity 42 in the reinforcing partition 40, while the reinforcing partition 40 plays a role in enhancing the overall stiffness of the soft-pack battery cells 30 after being grouped, the cavity 42 in the reinforcing partition 40 can absorb the expansion and deformation of the soft-pack battery cells 30. The cavity 42 in the reinforcing partition 40 can provide a buffer for the deformation of the adjacent soft-pack battery cells 30 and is beneficial to reducing the weight of the reinforcing partition 40.

[0273] Reference Fig.17 According to some embodiments of the present application, optionally, the cavity 42 includes a heat exchange channel 43 for the flow of heat exchange medium.

[0274] When at least a portion of the cavity 42 of the reinforcing partition plate 40 is used as the heat exchange flow channel 43 , the reinforcing partition plate 40 may serve as at least a portion of a heat management component.

[0275] For example, the reinforced partition 40 can be connected to the soft-pack battery cell 30 through a thermally conductive adhesive, so that heat exchange between the reinforced partition 40 and the soft-pack battery cell 30 can be easily achieved. When the heat exchange medium flows through the heat exchange channel 43, the temperature of the soft-pack battery cell 30 can be adjusted, for example, the temperature of the soft-pack battery cell 30 can be increased or decreased.

[0276] In the above technical solution, at least a portion of the cavity 42 in the reinforced partition 40 constitutes a heat exchange channel 43. When the heat exchange medium flows through the heat exchange channel 43 in the reinforced partition 40, the heat exchange medium can exchange heat with the soft-pack battery cell 30, thereby effectively adjusting the temperature of the soft-pack battery cell 30.

[0277] Reference Fig.11 and Fig.17 According to some embodiments of the present application, optionally, the reinforcing partition 40 includes a connecting portion 41 protruding from the packaging bag 31 along the second direction, and the connecting portion 41 is located on a side of the electrode lead 33 away from the electrical component 60 .

[0278] When the cavity 42 is formed in the reinforcing partition plate 40 , the cavity 42 may not extend to the connecting portion 41 , that is, the connecting portion 41 may be a solid structure.

[0279] In the above technical solution, by making the end of the reinforcing partition 40 along the second direction protrude from the packaging bag 31 of the soft-pack battery cell 30 and connected to the box body 10, since the reinforcing partition 40 is sandwiched between multiple soft-pack battery cells 30 and grouped with multiple soft-pack battery cells 30 to form a soft-pack battery cell group 20, and the hardness of the reinforcing partition 40 is generally greater than that of the packaging bag 31 of the soft-pack battery cell 30, the soft-pack battery cell group 20 as a whole has better strength and rigidity.

[0280] In some embodiments, the connection portion 41 may be connected to the box body 10. In this way, the connection portion 41 is connected to the box body 10, so that the soft-packed battery group 20 and the side wall of the box body 10 are connected and fixed. The connection portion 41 is a solid structure, which can make the connection between the soft-packed battery group 20 and the box body 10 more reliable, thereby improving the installation reliability and stability of the soft-packed battery group 20 in the box body 10.

[0281] Reference Fig.18 According to some embodiments of the present application, optionally, in the first direction, two adjacent reinforcing partitions 40 are connected by a connecting plate 44 , and the soft-pack battery cell 30 is accommodated in a space enclosed by the connecting plate 44 and the two reinforcing partitions 40 .

[0282] Specifically, the connecting plate 44 connects the ends of the two reinforcing partitions 40 on the same side in the second direction. The connecting plate 44 can be a straight plate or an arc-shaped plate with a small curvature, and the connecting plate 44 is substantially parallel to the first direction. The connecting plate 44 and the two reinforcing partitions 40 connected by the connecting plate 44 can form a frame shaped like the letter "U" and is arranged outside the soft-pack battery 30 between the two reinforcing partitions 40.

[0283] In the above technical solution, two adjacent reinforcing partitions 40 are connected by a connecting plate 44, and the soft-pack battery cell 30 is accommodated in the space surrounded by the connecting plate 44 and the two reinforcing partitions 40, thereby improving the strength of the reinforcing partition 40 and further increasing the installation reliability and stability of the soft-pack battery cell 30.

[0284] Reference Fig.18 According to some embodiments of the present application, optionally, two adjacent reinforcing partitions 40 in the first direction are formed into an integral structure with the connected connecting plate 44 .

[0285] As an example, every two adjacent heating baffles in the first direction are fixedly connected to the connecting plate 44 between the two reinforcing baffles 40 and can be integrally formed.

[0286] In the above technical solution, two adjacent reinforcing partitions 40 in the first direction and the connecting plate 44 connected between the two reinforcing partitions 40 are formed into an integrated structure, thereby further improving the strength of the reinforcing partitions 40 and increasing the installation reliability and structural stability of the soft-pack battery cell 30.

[0287] Reference Figure 19-21 According to some embodiments of the present application, optionally, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected.

[0288] It should be noted that the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, and the portion of the electrode lead 33 exposed outside the packaging bag is defined as a lead-out portion 331. The electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected, which actually means that the lead-out portions 331 of the two electrode leads 33 are directly connected.

[0289] The “direct connection” in which the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected means that the electrode leads 33 of the two soft-pack battery cells 30 are directly connected without the need for an electrical connection device to achieve electrical connection between the two adjacent soft-pack battery cells 30 .

[0290] The electrical connection between two adjacent soft-pack battery cells 30 may be a series connection.

[0291] In the above technical solution, by directly connecting the electrode leads 33 of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20, the electrical connection devices between the soft-pack battery cells 30 can be omitted or reduced, the number of components of the soft-pack battery cell group 20 can be reduced, thereby saving the space occupied by the electrical connection devices, which is beneficial to improving the energy density of the soft-pack battery cell group 20, and since the electrical connection devices between the soft-pack battery cells 30 are omitted or reduced, the cost can also be reduced.

[0292] According to some embodiments of the present application, optionally, the electrode leads 33 of two adjacent soft-pack battery cells 30 are connected by welding.

[0293] For example, the electrode leads 33 of two adjacent soft-pack battery cells 30 may be welded and connected by laser welding or ultrasonic welding.

[0294] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20 are connected by welding, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20, so that the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20 is simple and reliable.

[0295] According to some embodiments of the present application, optionally, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected by a conductive adhesive.

[0296] In some embodiments, the electrode leads 33 of two adjacent soft-pack battery cells 30 are directly connected by conductive glue.

[0297] For example, conductive glue may be coated on an electrode lead 33 of one of two adjacent soft-pack battery cells 30, and the electrode lead 33 of the other of the two adjacent soft-pack battery cells 30 may be connected to the electrode lead 33 coated with conductive glue; or, conductive glue may be coated on both electrode leads 33 of two adjacent soft-pack battery cells 30, and the two electrode leads 33 coated with conductive glue may be connected via the conductive glue.

[0298] In the above technical solution, the electrode leads 33 of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20 are connected by conductive glue, thereby achieving direct connection of the terminals of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20, so that the connection method of the electrode leads 33 of two adjacent soft-pack battery cells 30 in the soft-pack battery cell group 20 is simple and reliable.

[0299] Reference Fig. 22 and Fig.23 According to some embodiments of the present application, optionally, a plurality of soft-pack battery cells 30 are bonded and matched in sequence along a first direction, and the soft-pack battery cell 30 has a first surface 311 and a second surface 312, and the second surface 312 is adjacent to the first surface 311;

[0300] The battery device 100 includes a glue layer 34 and a blocking member 35. The glue layer 34 is arranged on one side of the soft-pack battery group 20 located on the first surface 311, and is used to adhere multiple soft-pack battery cells 30 to the box body 10. The blocking member 35 is at least located between at least one soft-pack battery cell 30 at both ends of the soft-pack battery group 20 in the first direction and the glue layer 34, and is used to prevent the glue layer 34 from overflowing from the first surface 311 of the soft-pack battery cell 30 to the second surface 312 of the corresponding soft-pack battery cell 30.

[0301] Specifically, the glue layer 34 may refer to a layered structure formed by glue for bonding.

[0302] The blocking member 35 may refer to a structure or component used to prevent the glue layer 34 from overflowing from the first surface 311 of the soft-pack battery cell 30 to the corresponding second surface 312 of the soft-pack battery cell 30. Exemplarily, the blocking member 35 may be L-shaped and may partially cover the first surface 311, thereby preventing the glue from overflowing to the second surface 312; the blocking member 35 may also be a flat plate, partially covering the first surface 311, and another portion exceeding the second surface 312. When the glue overflows, the overflowed glue may be located on another portion of the blocking member 35 without contacting the second surface 312, thereby also playing a role in preventing the glue from overflowing.

[0303] The first surface 311 and the second surface 312 may refer to the two surfaces of the soft-pack battery cell 30. The first surface 311 may be, but is not limited to, the bottom surface, top surface or side surface of the soft-pack battery cell 30, and may be fixed to the box body 10 through the adhesive layer 34. The second surface 312 may refer to a surface disposed adjacent to the first surface 311. The second surface 312 may be one or more. For example, the second surface 312 may be located at one or both ends of the first direction e1 of the first surface 311, or at one or both ends of the second direction e2 of the first surface 311, or at one or both ends of the first direction e1 of the first surface 311 and one or both ends of the second direction e2. Among them, the second direction e2 may refer to the other of the length direction or the width direction of the box body 10. Exemplarily, the first direction e1 may refer to the length direction of the box body 10, and the second direction e2 may refer to the width direction of the box body 10.

[0304] In the battery device 100 of the above structure, during the assembly stage, glue is applied between the first surface 311 of the plurality of soft-packed cells 30 of the soft-packed cell group 20 and the box body 10 to form a glue layer 34. Since the blocking member 35 is located between at least one soft-packed cell 30 at both ends of the first direction e1 of the soft-packed cell group 20 and the glue layer 34, the blocking member 35 can effectively reduce the risk of glue overflowing from the first surface 311 to the second surface 312 during the glue coating process, so that the second surface 312 of the soft-packed cell 30 can be effectively reduced to form a hard structure due to glue overflow. When the soft-packed cell 30 expands or moves, the risk of local stress concentration caused by the contact between the surface of the soft-packed cell 30 and the hard structure can be reduced, which is conducive to reducing the probability of damage to the soft-packed cell 30.

[0305] Secondly, the first surface 311 of the soft-packed battery cell 30 can be separated from the box body 10 by the glue layer 34, so that the soft-packed battery cell 30 and the box body 10 are not in contact, and thus the glue layer 34 can play an insulating role. Since the blocking member 35 is at least located between at least one soft-packed battery cell 30 and the glue layer 34 at both ends of the first direction e1 of the soft-packed battery cell group 20, the blocking member 35 can increase the distance between the first surface 311 of the soft-packed battery cell 30 and the box body 10, that is, increase the insulation gap between the first surface 311 and the box body 10, and also help to increase the thickness of the glue layer 34, thereby further enhancing the insulation between the soft-packed battery cell 30 and the box body 10.

[0306] In the above technical solution, by arranging the blocking member 35 to be located at least between at least one soft-pack battery cell 30 and the glue layer 34 at both ends of the first direction e1 of the soft-pack battery cell group 20, the risk of glue overflowing from the first surface 311 of the soft-pack battery cell 30 to the second surface 312 during glue coating can be reduced during the assembly stage of the battery device 100, and the probability of glue overflow forming a hard structure on the second surface 312 of the soft-pack battery cell 30 can be reduced, thereby improving the problem of local stress concentration on the surface of the soft-pack battery cell 30, reducing the risk of damage to the soft-pack battery cell 30, and enhancing the insulation between the first surface 311 of the soft-pack battery cell 30 and the box body 10, which is beneficial to improving the reliability of the soft-pack battery cell 30 and the reliability of the battery device 100.

[0307] Reference Fig.24 and Fig.25 According to some embodiments of the present application, optionally, the blocking member 35 at least covers the corner position of the corresponding soft-pack battery cell 30.

[0308] It is understandable that the blocking member 35 may cover the first surfaces 311 of all the soft-packed battery cells 30 in the soft-packed battery cell group 20, or may only cover the first surfaces 311 of the soft-packed battery cells 30 at both ends of the first direction e1, or may only cover the corner positions of the first surfaces 311 of the soft-packed battery cells 30 at both ends of the first direction e1. In the above three cases, the blocking member 35 can satisfy at least covering the corner positions of the corresponding soft-packed battery cells 30.

[0309] When glue is applied to the first surfaces 311 of all the soft-pack battery cells 30 of the soft-pack battery cell group 20 , the glue spreads along the first direction e1 and the second direction e2 and accumulates at the four corners of the soft-pack battery cell group 20 . Therefore, the probability of glue overflow at the corners of the soft-pack battery cell group 20 is higher than that at other positions.

[0310] In the above technical solution, the blocking member 35 covers the corner position of the corresponding soft-pack battery cell 30, which can effectively reduce the probability of glue accumulation at the corner position of the outermost soft-pack battery cell 30, and play a better role in preventing glue overflow. At the same time, it can also reduce the size of the blocking member 35 and the amount of material used, and can also leave a suitable size of space on the first surface 311 for glue coating, thereby improving the bonding firmness between the soft-pack battery cell 30 and the box body 10.

[0311] Reference Fig.25 According to some embodiments of the present application, optionally, the blocking member 35 at least covers an edge position of the corresponding soft-pack battery cell 30 located in the first direction e1.

[0312] It can be understood that in the above technical solution, the blocking member 35 can cover the first surfaces 311 of all the soft-packed battery cells 30 in the soft-packed battery cell group 20, or only cover the first surfaces 311 of the soft-packed battery cells 30 at both ends of the first direction e1, or only cover the edge positions of the corresponding soft-packed battery cells 30 in the first direction e1. In the above three cases, the blocking member 35 satisfies the requirement of covering the edge positions of the corresponding soft-packed battery cells 30 in the first direction e1.

[0313] Since a plurality of soft-packed cells 30 are arranged along the first direction e1, the second surfaces 312 of the soft-packed cells 30 located at both ends of the first direction e1 are usually large surfaces. By adopting the above technical solution, the blocking member 35 can not only reduce the risk of glue overflowing to the second surface 312 at the corner position of the soft-packed cell 30, but also reduce the risk of glue overflowing to the large surface of the soft-packed cell 30, and thus reduce the probability of the large surface of the soft-packed cell 30 forming a hard structure after the overflow glue solidifies, thereby further reducing the risk of damage to the soft-packed cell 30.

[0314] In the above technical solution, the blocking member 35 can reduce the risk of glue overflowing to the second surface 312 of the larger area of ​​the soft-pack battery cell 30, thereby further reducing the risk of glue overflowing to form a hard structure at the edge of the soft-pack battery cell group 20, and further reducing the risk of damage to the soft-pack battery cell 30, thereby improving the reliability of the battery device 100.

[0315] In some embodiments of the present application, reference Fig.24 The blocking members 35 are disposed at both ends of the soft-pack battery cell group 20 in the first direction e1. In the first direction e1, the size of the soft-pack battery cell group 20 is L1, and the size of the blocking member 35 is L2, wherein 0.05≤L2 / L1.

[0316] L2 / L1 may be, but is not limited to, 0.05, 0.07, 0.09, 0.10, 0.12, 0.15, 0.17, 0.2, 0.25, 0.3, etc. In other words, the blocking member 35 may select an appropriate size according to the value of the size L1 of the soft-pack battery cell group 20. For example, the size L2 of the blocking member 35 in the first direction e1 may be 5 mm, 6 mm, 7 mm, etc.

[0317] It is understandable that L2 / L1 must be greater than or equal to 0.05. If L2 / L1 is less than 0.05, the size of the portion of the blocking member 35 corresponding to the first surface 311 is relatively small, and the area of ​​the first surface 311 covered by the blocking member 35 is small. The blocking member 35 does not have enough solid parts to block the glue, and the risk of the glue overflowing from the blocking member 35 to the second surface 312 increases, and it cannot effectively prevent the glue from overflowing. In addition, the size of the portion of the blocking member 35 corresponding to the first surface 311 is relatively small, which also increases the risk of sharp objects piercing the first surface 311, and it cannot play a good protective role.

[0318] In the above technical solution, by setting the size ratio of the blocking member 35 and the soft-pack battery cell group 20 in the first direction e1 within the above range, the size of the blocking member 35 corresponding to the first surface 311 can be within an appropriate range, which can not only effectively prevent the glue from overflowing from the first surface 311 to the second surface 312, but also play a better protective role, reduce the risk of sharp objects contacting the first surface 311 and damaging the soft-pack battery cell 30, and improve the reliability of the battery device 100.

[0319] In some embodiments of the present application, the area of ​​the orthographic projection of the blocking member 35 on the plane where the first surfaces 311 are located is greater than or equal to the area of ​​all the first surfaces 311 .

[0320] In some embodiments of the present application, reference Fig.23 The blocking member 35 includes a first portion 351 and a second portion 352 connected to each other. The first portion 351 covers at least a portion of the first surface 311 , and the second portion 352 is bent relative to the first portion 351 in a direction away from the adhesive layer 34 .

[0321] It is understandable that the second portion 352 is arranged at an angle relative to the first portion 351, and the angle between the two can be set as needed. For example, the angle between the second portion 352 and the first portion 351 is an obtuse angle, so that the blocking member 35 can be configured in a V shape; the angle between the second portion 352 and the first portion 351 can also be a right angle, so that the blocking member 35 can be configured in an L shape (see Fig.23 ). Optionally, the first portion 351 and the first surface 311 may be connected by a method including but not limited to hot melting or bonding.

[0322] In the above technical solution, the first part 351 can play a role in increasing the gap between the first surface 311 and the box body 10, which is conducive to enhancing the insulation between the soft-pack battery cell group 20 and the box body 10. Since the second part 352 is bent relative to the first part 351, the second part 352 can play a good blocking role, which is conducive to further reducing the risk of glue spreading to the second surface 312 adjacent to the first surface 311. The blocking member 35 with the above structure has a relatively simple structure and is easy to manufacture, which can reduce costs.

[0323] In some embodiments of the present application, reference Fig. 22 and Fig.23 The soft-pack battery cell group 20 includes a reinforcing partition 40 and a connecting plate 44 . The plurality of soft-pack battery cells 30 are disposed between two adjacent reinforcing partitions 40 along the first direction. The reinforcing partition 40 and the connecting plate 44 are formed with an opening open toward the first surface 311 .

[0324] By reinforcing the partition 40, a relatively strong external protection structure can be provided for the multiple soft-pack battery cells 30, reducing the risk of damage to the soft-pack battery cells 30 due to external mechanical impact. It can also ensure that the soft-pack battery cells 30 are in the correct position in the box body 10, reducing the risk of poor contact due to the movement of the soft-pack battery cells 30.

[0325] In some embodiments of the present application, the blocking member 35 is made of an insulating material.

[0326] The insulating material may include but is not limited to ceramic material, glass material, plastic material, rubber material or mica material, etc., wherein the plastic material may include but is not limited to polypropylene, polyetherimide, etc.

[0327] The blocking member 35 can enhance the insulation between the soft-pack battery group 20 and the box body 10 by increasing the gap between the first surface 311 and the box body 10. On this basis, by setting the blocking member 35 as an insulating material, the blocking member 35 itself can have an insulating effect, thereby further enhancing the insulation between the soft-pack battery 30 and the box body 10, reducing the risk of short circuit, etc., and thus improving the reliability of the soft-pack battery group 20.

[0328] In the above technical solution, by making the blocking member 35 of insulating material, it is helpful to further enhance the insulation between the first surface 311 of the soft-pack battery cell 30 and the box body 10, thereby improving the insulation between the soft-pack battery cell group 20 and the box body 10, thereby improving the reliability of the battery device 100.

[0329] In some embodiments of the present application, reference Fig.23 The wall thickness of the blocking member 35 is H, wherein 1 mm ≤ H ≤ 3 mm.

[0330] H can be, but is not limited to, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, etc. It is understandable that if H is less than 1mm, the thickness of the blocking member 35 is small, and it cannot provide good protection and insulation. For example, if the thickness of the blocking member 35 is small, the risk of the processing burrs of the box 10 or external sharp objects piercing the blocking member 35 and piercing the soft-pack battery cell 30 increases, and the effect of increasing the gap between the first surface 311 and the box 10 is relatively poor, and it cannot provide good insulation. When the blocking member 35 is made of insulating material, the thickness of the blocking member 35 is small, resulting in that the blocking member 35 itself cannot provide high insulation.

[0331] Considering that the processing burrs of the box body 10 are generally less than 3 mm, if H is greater than 3 mm, the thickness of the blocking member 35 is relatively large, which will lead to excessive protection performance, and the increased gap between the first surface 311 and the box body 10 is also relatively large, which has far exceeded the insulation requirements. When the blocking member 35 is made of an insulating material, its own insulation will also exceed expectations. That is to say, if H is greater than 3 mm, the protection performance and insulation performance of the blocking member 35 will be excessive, and it will occupy a large space, which is not conducive to the compact design of the battery device 100, nor is it conducive to improving the energy density of the battery device 100.

[0332] It should be noted that, depending on the material of the blocking member 35, the blocking member 35 can have different wall thicknesses. For example, when the blocking member 35 is made of polyetherimide (PEI), the blocking member 35 not only meets the function of preventing glue from overflowing, but also has insulation. At this time, the wall thickness of the blocking member 35 can be 2 mm, and the size of the portion corresponding to the first surface 311 in the first direction e1 can be 7 mm. When the blocking member 35 is made of aluminum, it can be designed into an L shape, and an insulating layer is provided on the surface. At this time, the thickness of the blocking member 35 can be 1 mm, and the size of the portion corresponding to the first surface 311 in the first direction e1 can be 5 mm. When the blocking member 35 is made of polypropylene (PP), it can also be designed into an L shape, the thickness of the blocking member 35 can be 1.5 mm, and the size of the portion corresponding to the first surface 311 in the first direction e1 can be 6 mm.

[0333] In the above technical solution, by setting the wall thickness of the blocking member 35 within the above range, the thickness of the blocking member 35 can be reduced as much as possible while satisfying the protection and insulation properties, thereby saving the space occupied by the blocking member 35 and reducing the weight of the blocking member 35, which is beneficial to the compact design of the battery device 100, and can reduce the overall weight of the battery device 100, and can improve the energy density of the battery device 100.

[0334] In some embodiments of the present application, the energy density of the soft-pack battery cell 30 is E, and the melting point of the barrier 35 is T1, wherein: when E≤390Wh / L, T1>150°C; when E>390Wh / L, T1>200°C.

[0335] When the energy density E of the soft-pack battery cell 30 is greater than or equal to 390Wh / L, the temperature of the soft-pack battery cell 30 when thermal runaway occurs exceeds 200°C. Therefore, the blocking member 35 can be made of a material with a melting point greater than 200°C, which can reduce the risk of the blocking member 35 melting and causing performance damage during thermal runaway, and improve the high temperature resistance of the blocking member 35. When the energy density E of the soft-pack battery cell 30 is less than 390Wh / L, the temperature of the soft-pack battery cell 30 when thermal runaway occurs is less than 150 degrees. Therefore, the blocking member 35 can be made of a material with a melting point greater than 150°C, which can meet the high temperature resistance of the blocking member 35 and also help reduce costs.

[0336] For example, when the blocking member 35 is made of polypropylene (PP), the melting point is greater than or equal to 150°C; when the blocking member 35 is made of polyetherimide (PEI), the melting point is greater than or equal to 250°C; when the blocking member 35 is made of polyimide (PI), the melting point is greater than or equal to 300°C; when the blocking member 35 is made of aluminum with an insulating layer, the melting point is greater than or equal to 660°C; when the blocking member 35 is made of steel with an insulating layer, the melting point is greater than or equal to 1000°C.

[0337] In the above technical solution, by setting the melting point of the blocking member 35 and the energy density of the soft-pack battery cell 30 within the above range, the blocking member 35 can have suitable high temperature resistance, thereby improving the reliability of the blocking member 35, thereby improving the reliability of the battery device 100, while also taking into account the cost of the blocking member 35, which is beneficial to reducing the cost of the battery device 100.

[0338] In some embodiments of the present application, reference Fig. 22 The box body 10 includes a plurality of box walls 111 , which together define a receiving space 10 a , and the first surface 311 and the blocking member 35 are bonded to the box walls 111 via an adhesive layer 34 .

[0339] The box wall 111 may refer to a wall panel surrounding the box body 10. The multiple box walls 111 may include a top cover 11, a bottom plate 12, a side box wall, etc. In the above technical solution, the first surface 311 of the soft-pack battery cell 30 may be bonded and fixed to one of the top cover 11, the bottom plate 12, and the side box wall through the adhesive layer 34.

[0340] In the above technical solution, the first surface 311 of the soft-pack battery cell 30 and the blocking member 35 can be bonded and fixed to the box wall 111 of the box body 10 through the adhesive layer 34, so that the connection between the soft-pack battery cell 30 and the box body 10 is more secure.

[0341] In some embodiments of the present application, reference Fig.23 The box body 10 includes a box body 101 and a heat exchange plate 102 . The heat exchange plate 102 is connected to the box body 101 and defines a receiving space 10a together with the box body 101 . The first surface 311 and the blocking member 35 are bonded to the heat exchange plate 102 through an adhesive layer 34 .

[0342] The heat exchange plate 102 may refer to a component that can perform heat exchange with the soft-pack battery cell 30 to adjust the temperature of the soft-pack battery cell 30. Exemplarily, the heat exchange plate 102 may be a cold plate. In this technical solution, the heat exchange plate 102 and the box body 101 may together form the box body 10. Among them, the heat exchange plate 102 may serve as a box wall 111 of the box body 10. For example, the box body 101 has no bottom wall, and the heat exchange plate 102 is connected to the bottom of the box body 101, serving as the bottom wall of the entire box body 10; the heat exchange plate 102 may also be provided on any wall panel of the box body 101, and together with the corresponding wall panel, form a box wall 111 of the box body 10.

[0343] In the above technical solution, by bonding the first surface 311 of the soft-pack battery cell 30 and the blocking member 35 to the heat exchange plate 102 through the adhesive layer 34, the heat exchange plate 102 can efficiently exchange heat for the soft-pack battery cell 30 and quickly adjust the temperature of the soft-pack battery cell 30, which is beneficial to improving the reliability of the soft-pack battery cell 30 and further improving the reliability of the battery device 100.

[0344] Optionally, the heat exchange plate 102 is disposed at the bottom of the box body 101 .

[0345] According to some embodiments of the present application, optionally, the soft-pack battery cell 30 is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

[0346] The solid-state battery cell may be, but is not limited to, a polymer solid-state battery cell, an oxide solid-state battery cell, a sulfide solid-state battery cell, a halide solid-state battery cell, etc. The solid-state battery cell may also be a semi-solid-state battery cell or a fully solid-state battery cell.

[0347] In the above technical solution, the soft-pack battery cell 30 adopts the above types to provide more options for the design of the battery device to meet different usage requirements. Among them, the soft-pack battery cell 30 is a lithium iron phosphate battery cell, which has the advantages of high reliability, long cycle life, light weight, large capacity, and low internal resistance; the soft-pack battery cell 30 is a ternary battery cell, which has the advantages of high energy density and good electrochemical performance; the soft-pack battery cell 30 is a solid-state battery cell, which has the advantages of high energy density and high reliability, light weight, and good high and low temperature performance.

[0348] According to some embodiments of the present application, optionally, the soft-pack battery cell 30 is a lithium iron phosphate battery cell, and in the positive electrode material of the soft-pack battery cell 30, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (1-3): (1-3); the soft-pack battery cell 30 is a ternary battery cell, and in the positive electrode material of the soft-pack battery cell 30, the usage ratio of the positive electrode active material, the binder, and the conductive agent is 96: (2-3): (1-2).

[0349] In some embodiments, the positive electrode of the soft-pack battery cell 30 may be a positive electrode sheet, which may include a positive electrode collector and a positive electrode film layer disposed on at least one surface of the positive electrode collector, wherein the positive electrode film layer includes a positive electrode active material.

[0350] As an example, the positive electrode current collector has two surfaces opposite to each other in its thickness direction, and the positive electrode film layer is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0351] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, titanium, silver surface treated aluminum or stainless steel, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0352] As an example, when the soft-pack battery cell 30 of the embodiment of the present application is a lithium-ion battery, the positive electrode active material may include at least one of the following materials: phosphate, layered transition metal oxide and their respective modified compounds; Optionally, the positive electrode active material may include layered transition metal oxide and their respective modified compounds, which is beneficial to improve the energy density of the soft-pack battery cell 30. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode film layers can also be used. These positive electrode active materials can be used alone or in combination of two or more.

[0353] Examples of phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0354] Layered transition metal oxides include those of the general formula Li a Ni b Co c M d O e Af At least one of the compounds and modified compounds thereof. 0.8≤a≤1.2, 0.3≤b<1, 0<c<1, 0<d<1, 1≤e≤2, 0≤f≤1, M includes at least one of Mn, Al, Zr, Zn, Cu, Cr, Mg, Fe, V, Ti and B, and A includes at least one of N, F, S and Cl. Optionally, 0.5≤b<1, further optionally, 0.75≤b≤0.98.

[0355] Examples of layered transition metal oxides may include, but are not limited to, lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811), LiNi 0.9 Co 0.05 Mn 0.05 O2 (also referred to as Ni90), lithium nickel cobalt aluminum oxide (such as LiNi 0.80 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0356] When the soft-pack battery cell 30 of the embodiment of the present application is a sodium ion battery, the positive electrode active material may include but is not limited to at least one of sodium-containing transition metal oxides, polyanion materials (such as phosphates, fluorophosphates, pyrophosphates, sulfates, etc.), and Prussian blue materials.

[0357] As an example, the positive electrode active material for sodium ion batteries may include NaFeO2, NaCoO2, NaCrO2, NaMnO2, NaNiO2, NaNi 1 / 2 Ti 1 / 2 O2、NaNi 1 / 2 Mn1 / 2 O2、Na 2 / 3 Fe 1 / 3 Mn 2 / 3 O2、NaNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, NaFePO4, NaMnPO4, NaCoPO4, Prussian blue materials, general formula X p M' q (PO4) r O x Y 3-x In the general formula X p M' q (PO4) r O x Y 3-x , 0<p≤4, 0<q≤2, 1≤r≤3, 0≤x≤2, X includes H + , Li + 、Na + , K + and NH4 + At least one of, M' is a transition metal cation, optionally at least one of V, Ti, Mn, Fe, Co, Ni, Cu and Zn, and Y is a halogen anion, optionally at least one of F, Cl and Br.

[0358] In the embodiments of the present application, the modified compounds of the above-mentioned positive electrode active materials can be doping modification and / or surface coating modification of the positive electrode active materials, such as carbon coating modification, fast ion conductor coating modification, etc.

[0359] The soft-pack battery cell 30 is accompanied by the deintercalation and consumption of active ions such as Li during the charge and discharge process, and the molar content of Li in the soft-pack battery cell 30 is different when it is discharged to different states. In the examples of the positive electrode active materials in the present application, the molar content of Li is the initial state of the material, that is, the state before feeding. The positive electrode active material is used in the battery system, and the molar content of Li may change after charge and discharge cycles.

[0360] In the examples of the present application regarding the positive electrode active materials, the molar content of oxygen O is only a theoretical value. The release of oxygen from the lattice will cause the molar content of oxygen O to change. In reality, the molar content of oxygen O will fluctuate.

[0361] In the embodiments of the present application, the content of the elements in the positive electrode active material is a well-known meaning in the art, and can be detected by equipment and methods well-known in the art, for example, with reference to EPA 6010D-2014, tested by inductively coupled plasma atomic emission spectrometry, and measured by plasma atomic emission (ICP-OES, instrument model: Thermo ICAP7400). First, weigh 0.4 g of the positive electrode active material and add 10 ml (50% concentration) of aqua regia thereto. Then place it on a plate at 180 ° C for 30 minutes. After digestion on the plate, dilute to a volume of 100 mL, and use the standard curve method for quantitative testing.

[0362] In some embodiments, the positive electrode may be a foam metal or a foam carbon. The foam metal may be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. When the foam metal is used as the positive electrode, the positive electrode film layer may not be provided on the surface of the foam metal, but of course, a positive electrode film layer may also be provided. As an example, a lithium source material, potassium metal or sodium metal may be filled or / and deposited in the foam metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0363] In some embodiments, the positive electrode film layer may further optionally include a positive electrode conductive agent. The present application embodiment has no particular restrictions on the type of the positive electrode conductive agent. As an example, the positive electrode conductive agent includes at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene and carbon nanofibers. In some embodiments, the mass percentage of the positive electrode conductive agent in the positive electrode film layer is ≤5wt%.

[0364] In some embodiments, the positive electrode film layer may also optionally include a positive electrode binder. The embodiment of the present application has no particular restrictions on the type of positive electrode binder. As an example, the positive electrode binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylic resin. In some embodiments, the mass percentage of the positive electrode binder in the positive electrode film layer is ≤5wt%.

[0365] The positive electrode film layer is usually formed by coating the positive electrode slurry on the positive electrode current collector, drying and cold pressing. The positive electrode slurry is usually formed by dispersing the positive electrode active material, optional conductive agent, optional binder and any other components in a solvent and stirring them evenly. The solvent can be N-methylpyrrolidone (NMP), but is not limited thereto.

[0366] In some embodiments, the negative electrode may be a negative electrode plate, which may include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, wherein the negative electrode film layer includes a negative electrode active material.

[0367] As an example, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode film layer is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0368] As an example, the negative electrode current collector may be a metal foil, a foamed metal, a foamed carbon or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode or titanium, etc. may be used. The foamed metal may be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0369] As an example, the negative electrode active material may adopt the negative electrode active material for the soft-pack battery 30 known in the art. As an example, the negative electrode active material may include at least one of the following materials: carbon material (for example, the carbon material includes at least one of artificial graphite, natural graphite, soft carbon, and hard carbon), silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material may include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may include at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode film layers of batteries can also be used. These negative electrode film layers can be used alone or in combination of two or more.

[0370] In some embodiments, the negative electrode active material includes silicon, which may be present in the form of a silicon-based material, such as a silicon-based material that may include at least one of elemental silicon, silicon-oxygen compounds, silicon-carbon compounds, silicon-nitrogen compounds, and silicon alloys. The introduction of silicon can improve the energy density of the soft-pack battery cell 30.

[0371] In some embodiments, the mass content of silicon in the negative electrode film layer is 1wt% to 32wt%, optionally 2wt% to 19wt%, and further optionally 6wt% to 13wt%. In the soft-pack battery 30 system, when the mass content of silicon is within the above range, the energy density of the soft-pack battery 30 can be improved.

[0372] In the embodiments of the present application, the mass content of silicon in the negative electrode film layer has a meaning well known in the art and can be detected by using equipment and methods well known in the art. For example, the negative electrode plate is immersed in a solvent such as water, the negative electrode active material is separated from the negative electrode current collector, and the negative electrode active material is obtained by filtration. The negative electrode active material is measured using an ICAP7400 inductively coupled plasma-emission spectrometer of ThermoFisher Scientific, USA, and with reference to GB / T30902-2014 standard to obtain the silicon content.

[0373] In some embodiments, the negative electrode film layer may further optionally include a negative electrode conductive agent. The embodiment of the present application has no particular restrictions on the type of the negative electrode conductive agent. As an example, the negative electrode conductive agent may include at least one of superconducting carbon, conductive graphite, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers. In some embodiments, the mass percentage of the negative electrode conductive agent in the negative electrode film layer is ≤5wt%.

[0374] In some embodiments, the negative electrode film layer may also optionally include a negative electrode binder. The embodiment of the present application has no particular restrictions on the type of negative electrode binder. As an example, the negative electrode binder may include at least one of styrene-butadiene rubber (SBR), water-soluble unsaturated resin SR-1B, water-based acrylic resin (e.g., polyacrylic acid PAA, polymethacrylic acid PMAA, sodium polyacrylate PAAS), polyacrylamide (PAM), polyvinyl alcohol (PVA), sodium alginate (SA) and carboxymethyl chitosan (CMCS). In some embodiments, the mass percentage of the negative electrode binder in the negative electrode film layer is ≤5%.

[0375] In some embodiments, the negative electrode film layer may further include other additives. As an example, the other additives may include thickeners, such as sodium carboxymethyl cellulose (CMC-Na), PTC thermistor materials, etc. In some embodiments, the mass percentage of the other additives in the negative electrode film layer is ≤ 2wt%.

[0376] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0377] In some embodiments, the separator includes a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0378] The embodiments of the present application have no particular restrictions on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0379] In some embodiments, the material of the isolation membrane may include one or more of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The isolation membrane may be a single-layer film or a multi-layer composite film, without particular limitation. When the isolation membrane is a multi-layer composite film, the materials of each layer may be the same or different, without particular limitation.

[0380] In some embodiments, the isolation membrane may include a porous base membrane and a coating layer disposed on at least one side of the porous base membrane, and the coating layer may include at least one of inorganic particles or organic particles.

[0381] The porous base membrane may include one or more of polyethylene and polypropylene.

[0382] The inorganic particles have good heat resistance and can improve the heat resistance of the separator as a whole. The inorganic particles will not undergo oxidation and reduction reactions with metal dendrites within the operating voltage range of the sodium ion battery. In other words, the inorganic particles are configured not to undergo oxidation and reduction reactions with alkali metals and / or alkaline earth metals at the nominal voltage of the sodium ion battery.

[0383] In some embodiments, the inorganic particles include one or more of boehmite γ-AlOOH, aluminum oxide Al2O3, aluminum hydroxide Al(OH)3, barium sulfate BaSO4, magnesium oxide MgO, magnesium hydroxide Mg(OH)2, calcium oxide CaO, cerium oxide CeO2, zirconium titanate SrTiO3, barium titanate BaTiO3, and magnesium fluoride MgF2.

[0384] In some embodiments, the organic particles include at least one of polystyrene, polyethylene, polyimide, melamine resin, phenolic resin, polypropylene, polyester (e.g., polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate), polyphenylene sulfide, polyaramid, polyamideimide, polyimide, copolymer of butyl acrylate and ethyl methacrylate, and mixtures thereof.

[0385] In some embodiments, the soft-pack battery cell 30 further includes an electrolyte.

[0386] During the charge and discharge process of the battery cell, active ions are embedded and released back and forth between the positive electrode and the negative electrode, and the electrolyte plays a role in conducting active ions between the positive electrode and the negative electrode. The present application embodiment has no particular limitation on the type of electrolyte, which can be selected according to actual needs.

[0387] The electrolyte includes electrolyte salt and solvent. The types of electrolyte salt and solvent are not specifically limited and can be selected according to actual needs.

[0388] In some embodiments, the electrolyte may also optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain battery properties, such as additives that improve battery overcharge performance, additives that improve battery high temperature performance, and additives that improve battery low temperature power performance.

[0389] For example, the additive includes at least one of a cyclic carbonate compound containing an unsaturated bond, a sulfate compound, a sulfite compound, a sultone compound, a disulfonic acid compound, a nitrile compound, an aromatic compound, an isocyanate compound, a phosphazene compound, an acid anhydride, a cyclic acid anhydride compound, a phosphite compound, a phosphate compound, a borate ester, and a carboxylate compound.

[0390] It can be understood that when the soft-pack battery cell 30 is a lithium iron phosphate battery cell, in the positive electrode material of the soft-pack battery cell 30, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1 to 3 parts of the total weight of the positive electrode material (for example, it may include but is not limited to 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, etc.).

[0391] For example, when the soft-pack battery cell 30 is a lithium iron phosphate battery cell, the positive electrode active material is LFP (which may refer to LiFePO4, i.e., lithium iron phosphate), the binder may be PVDF (polyvinylidene fluoride), and the conductive agent may be conductive carbon black, wherein LFP:PVDF:conductive carbon black may be 96:2:2, that is, the total weight of the positive electrode active material is 100 parts, LFP accounts for 96 parts, PVDF accounts for 2 parts, and conductive carbon black also accounts for 2 parts. The weight unit of the positive electrode active material may be grams.

[0392] When the soft-pack battery cell 30 is a ternary battery cell, in the positive electrode material of the soft-pack battery cell 30, the positive electrode active material accounts for 96 parts of the total weight of the positive electrode material, the binder accounts for 2-3 parts of the total weight of the positive electrode material (for example, including but not limited to 2, 2.2, 2.5, 2.8, 3, etc.), and the conductive agent accounts for 1-2 parts of the total weight of the positive electrode material (for example, including but not limited to 1, 1.2, 1.5, 1.8, 2, etc.). Among them, the ternary battery cell can be but not limited to nickel cobalt manganese lithium oxide system, nickel cobalt aluminum lithium oxide system, etc.

[0393] For example, the ternary material of the ternary battery cell can be eight series LiNi 0.8 Co 0.1 Mn 0.1O2, the weight ratio of the positive electrode active material, binder and conductive agent is 96:2.5:1.5, that is, the total weight of the positive electrode material is divided into 100 parts, eight series LiNi 0.8 Co 0.1 Mn 0.1 O2 accounts for 96 parts, the binder accounts for 2.5 parts, and the conductive agent accounts for 1.5 parts.

[0394] In the above technical solution, when the soft-pack battery cell 30 is a lithium iron phosphate battery cell, a high proportion of positive electrode active material means that more substances capable of electrochemical reactions can be accommodated in a limited electrode assembly, which is beneficial to increasing the capacity and energy density of the battery device 100, so that the lithium iron phosphate battery cell can output a higher amount of electricity in a relatively small volume and weight, meeting the application scenario with certain requirements for energy density. The amount of the binder and the conductive agent used in the above range can reduce the cost of auxiliary materials, thereby reducing the overall cost of the battery device 100. When the soft-pack battery cell 30 is a ternary battery cell, since the structure and surface properties of the ternary material itself are relatively complex, the use of the positive electrode active material, binder, and conductive agent in the above-mentioned dosage ratio is beneficial to ensure good bonding between the positive electrode active material particles and between the active material and the current collector, thereby improving the mechanical stability and integrity of the electrode assembly, and is beneficial to reducing the risk of active material shedding and electrode pulverization during charging and discharging, and extending the cycle life of the battery device 100.

[0395] On the second hand, please refer again to Figure 1 An embodiment of the present application provides an electrical device, which includes a battery device 100 according to any of the above embodiments, and the battery device 100 is used to provide electrical energy.

[0396] The electrical device may be a vehicle 1000 , and the battery device 100 may be installed at the bottom of the vehicle body.

[0397] In the electrical device of the technical solution of the present application, at least two adjacent sampling parts 81 can collect parameters of two or more soft-pack battery cells 30, so that the number of sampling parts 81 can be reduced accordingly, and the wiring harness connected to the sampling parts 81 can also be shortened and streamlined, so that the structure of the battery device 100 is more compact and space-saving, which in turn helps to improve the energy density of the battery device 100 and reduce costs to a certain extent.

[0398] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A soft-packed battery cell group, the soft-packed battery cell group comprising a plurality of soft-packed battery cells arranged along a first direction, each of the soft-packed battery cells being bonded to the box body, and comprising a packaging bag and an electrode lead, the electrode lead being arranged at an end of the packaging bag along a second direction, all of the electrode leads of the plurality of soft-packed battery cells of the soft-packed battery cell group located on the same side being arranged in sequence along the first direction, and along a third direction, the plurality of electrode leads and the end of the soft-packed battery cell group forming an accommodation gap; An electrical component, disposed in the accommodation gap and electrically connected to the electrode lead; The first direction, the second direction and the third direction are arranged at angles to each other.

2. The battery device according to claim 1, characterized in that: The electrical components include a battery monitoring unit and / or electrical connections.

3. The battery device according to claim 2, characterized in that: The electrical component includes a battery monitoring unit and the electrical connector, wherein the electrical connector is located between the electrode lead and the battery monitoring unit, and the electrical connector electrically connects the battery monitoring unit and the electrode lead.

4. The battery device according to claim 2, characterized in that: The battery device includes a main control board, and the electrical component includes a battery monitoring unit, which is electrically connected to the main control board.

5. The battery device according to claim 1, characterized in that: The box body includes a bottom plate, and the accommodating gap is located between the bottom plate and the electrode lead.

6. The battery device according to claim 5, characterized in that: The battery device comprises a bracket connected to the box body, and the electrical component is installed on the bracket.

7. The battery device according to claim 1, characterized in that: The electrical components are bonded to the box wall of the box body.

8. The battery device according to claim 1, characterized in that: The electrical component includes a battery monitoring unit, and a length of the battery monitoring unit extends along a first direction.

9. The battery device according to claim 1, characterized in that: There are multiple soft-pack battery cell groups, and the multiple soft-pack battery cell groups are arranged along the second direction. The electrical component is arranged between two groups of the soft-pack battery cell groups or on one side of all the soft-pack battery cell groups.

10. The battery device according to claim 1, characterized in that: The electrical component includes a battery monitoring unit, and at least one electrode lead of each of the soft-pack battery cells is electrically connected to the battery monitoring unit through a conductive member.

11. The battery device according to claim 10, characterized in that: A corner space is formed at a corner of the packaging bag along the third direction, the conductive member is at least partially located in the corner space, and the conductive member extends along the second direction.

12. The battery device according to claim 10, characterized in that: The conductive member includes a first end and a second end opposite to each other, the first end is welded or bonded to the electrode lead, and the second end is electrically connected to the battery monitoring unit.

13. The battery device according to claim 12, characterized in that: The electrical component includes an electrical connector, and the battery device includes a first adapter wire and a second adapter wire, the first adapter wire and the second adapter wire are both connected to the electrical connector, the second ends of the plurality of conductive parts are connected to the electrical connector through the corresponding first adapter wires, and the end of the second adapter wire away from the electrical connector is connected to the battery monitoring unit.

14. The battery device according to claim 13, characterized in that: The end of the second adapter wire away from the electrical connector is connected to a first connector, the battery monitoring unit is provided with a second connector, and the first connector is plugged into the second connector.

15. The battery device according to claim 10, characterized in that: The conductive member is at least one of a flexible circuit board and a wiring harness.

16. The battery device according to any one of claims 1 to 15, characterized in that: The electrical component includes a battery monitoring unit, all of the soft-pack cells are arranged in series, and the battery monitoring unit collects parameters of the soft-pack cells through a sampling part connected to the electrode lead.

17. The battery device according to claim 16, characterized in that: On the current path, the number of the soft-pack battery cells between at least two adjacent sampling parts is greater than or equal to two.

18. The battery device according to claim 17, characterized in that: On the current path, the two electrode leads of the first soft-pack battery cell and the last soft-pack battery cell are both connected to the sampling part.

19. The battery device according to claim 18, characterized in that: On the current path, between the first soft-packed battery cell and the last soft-packed battery cell, there are two soft-packed battery cells between two adjacent sampling parts.

20. The battery device according to claim 16, characterized in that At least one electrode lead of each of the soft-packed cells is electrically connected to the battery monitoring unit via a conductive member, wherein the conductive member includes a first end and a second end opposite to each other, and the first end forms the sampling portion.

21. The battery device according to any one of claims 1 to 15, characterized in that: In the first direction, a reinforcing partition is sandwiched between at least two adjacent soft-pack battery cells, the reinforcing partition is connected to the packaging bag, and the hardness of the reinforcing partition is greater than the hardness of the packaging bag.

22. The battery device according to claim 21, characterized in that The thickness of the reinforcing partition is smaller than the thickness of the soft-pack battery cell.

23. The battery device according to claim 21, characterized in that The reinforcing partition is a metal plate.

24. The battery device according to claim 21, characterized in that The reinforcing partition is a heat-conducting member and is thermally connected to the packaging bag.

25. The battery device according to claim 21, characterized in that The reinforced partition is a solid structure.

26. The battery device according to claim 21, characterized in that A cavity is formed in the reinforced partition.

27. The battery device according to claim 26, characterized in that The cavity includes a heat exchange flow channel for the flow of heat exchange medium.

28. The battery device according to claim 21, characterized in that The reinforcing partition includes a connecting portion protruding from the packaging bag along the second direction, and the connecting portion is located on a side of the electrode lead away from the electrical component.

29. The battery device according to claim 21, characterized in that In the first direction, two adjacent reinforcing partitions are connected by a connecting plate, and the soft-pack battery cell is accommodated in a space surrounded by the connecting plate and the two reinforcing partitions.

30. The battery device according to claim 29, characterized in that The two adjacent reinforcing partitions in the first direction and the connected connecting plate are formed into an integral structure.

31. The battery device according to any one of claims 1 to 15, characterized in that: The electrode leads of two adjacent soft-pack battery cells are directly connected.

32. The battery device according to claim 31, characterized in that The electrode leads of two adjacent soft-pack battery cells are connected by welding.

33. The battery device according to claim 31, characterized in that The electrode leads of two adjacent soft-pack battery cells are directly connected via conductive glue.

34. The battery device according to any one of claims 1 to 15, characterized in that: The plurality of soft-packed battery cells are bonded and matched in sequence along the first direction, the soft-packed battery cell has a first surface and a second surface, and the second surface is adjacent to the first surface; The battery device includes a glue layer and a blocking member, wherein the glue layer is arranged on one side of the soft-pack battery group located on the first surface and is used to adhere the multiple soft-pack battery cells to the box body, and the blocking member is located between at least one of the soft-pack battery cells at both ends of the soft-pack battery cell group in the first direction and the glue layer, and is used to prevent the glue layer from overflowing from the first surface of the soft-pack battery cell to the corresponding second surface of the soft-pack battery cell.

35. The battery device according to claim 34, characterized in that The blocking member at least covers the corner position corresponding to the soft-pack battery cell.

36. The battery device according to claim 34, characterized in that The blocking member at least covers an edge position corresponding to the soft-pack battery core in the first direction.

37. The battery device according to claim 34, characterized in that A blocking member is provided between two adjacent soft-pack battery cells along the first direction.

38. The battery device according to any one of claims 1 to 15, characterized in that: The soft-pack battery cell is any one of a lithium iron phosphate battery cell, a ternary battery cell and a solid-state battery cell.

39. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 38, wherein the battery device is used to provide electrical energy.

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