Sampling assembly, battery pack and electric equipment

Abstract

The embodiment of the invention provides a sampling assembly, a battery pack and electric equipment, the sampling assembly is used for collecting information of a battery cell, the battery cell comprises two electrode lead-out parts which are oppositely arranged along a first direction, and the sampling assembly comprises a substrate, a sampling piece and a collector; wherein the sampling piece and the collector are connected to the substrate, the sampling piece comprises a first circuit and a second circuit, one end of the first circuit and one end of the second circuit are connected with the collector, the other end of the first circuit is used for being connected with one electrode leading-out part on the battery cell, and the other end of the second circuit is used for being connected with the other electrode leading-out part on the battery cell. And the other end of the second circuit is used for connecting the other electrode lead-out part on the battery cell. According to the sampling assembly, the fixing structure of the sampling circuit is simplified, the internal space, occupied by the sampling assembly, of the battery pack is reduced, the structural strength of the sampling piece is enhanced, the circuit stability is guaranteed, the integrity of the sampling assembly is improved, and the sampling reliability is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a sampling component, a battery pack and an electrical device. Background Art

[0002] The sampling structure of the battery pack is usually used to collect parameters such as voltage, current, and temperature to understand the operating status of the battery pack and ensure the operating quality of the battery pack during use.

[0003] In the related art, the sampling structure in the battery pack needs to consider the connection between the sampling lines and the fixation of the sampling lines, which results in a complex sampling line structure and a large occupied space inside the battery pack. Summary of the invention

[0004] The present application aims to provide a sampling component, a battery pack and an electrical device to solve the problem of complex sampling structure and space occupation of the battery pack.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a sampling assembly for collecting information of a battery cell, wherein the battery cell comprises two electrode lead-out portions arranged opposite to each other along a first direction, and the sampling assembly comprises a substrate, a sampling member and a collector; wherein:

[0007] The sampling component and the collector are connected to the substrate, and the sampling component includes a first circuit and a second circuit. One end of the first circuit and the second circuit are connected to the collector, the other end of the first circuit is used to connect to one of the electrode lead-out parts on the battery cell, and the other end of the second circuit is used to connect to another electrode lead-out part on the battery cell.

[0008] Optionally, both the first circuit and the second circuit are flexible die-cut circuits, and an insulating film is provided on at least one side of the flexible die-cut circuit away from the substrate, and the insulating film covers the first circuit and the second circuit.

[0009] Optionally, the first circuit, the second circuit and the substrate are an integrally formed structure.

[0010] Optionally, the first circuit and the second circuit are fixedly connected to the substrate by hot pressing through the insulating film.

[0011] Optionally, the first circuit, the second circuit and the collector are electrically connected via metal wires.

[0012] Optionally, the first circuit and the second circuit are used to collect information of the plurality of battery cells, wherein the first circuit and the second circuit each include a plurality of sub-circuits spaced apart along a second direction, one of the sub-circuits is connected to the electrode lead-out portion of one of the battery cells, and the second direction intersects with the first direction.

[0013] Optionally, the sub-circuit is provided with a first pad at one end close to the collector, and the collector is provided with a second pad at one end close to the sub-circuit, and the first pad is electrically connected to the second pad through the metal wire.

[0014] Optionally, the first line and the second line are respectively arranged on two sides of the collector along the first direction.

[0015] Optionally, the number of the first lines and the number of the second lines are both multiple, the multiple first lines are arranged at intervals along the second direction, and the multiple second lines are arranged at intervals along the second direction, and the second direction intersects with the first direction.

[0016] Optionally, there are multiple collectors, and the multiple collectors are spaced apart along the second direction on the substrate, and one collector is used to connect one first circuit and one second circuit; the sampling component also includes a third circuit, and adjacent collectors are electrically connected through the third circuit.

[0017] Optionally, the third circuit is a flexible die-cut circuit, and the third circuit is electrically connected to the collector through a metal wire.

[0018] Optionally, a third pad is provided on the third circuit, a fourth pad is provided on the collector, and the third pad is electrically connected to the fourth pad through the metal wire.

[0019] Optionally, the metal wire is an aluminum wire.

[0020] Optionally, the aluminum wire includes an arc-shaped portion arched away from the substrate.

[0021] Optionally, the diameter of the aluminum wire is in the range of 3-8 mil.

[0022] In the second aspect, the present application also discloses a battery pack, comprising a plurality of battery cells and a sampling assembly as described above, wherein the plurality of battery cells are arranged in sequence along a second direction, the battery cells include two electrode lead-out portions arranged opposite to each other along a first direction, one end of the first circuit and the second circuit are connected to the collector, the other end of the first circuit is connected to one of the electrode lead-out portions on the battery cell, the other end of the second circuit is connected to another electrode lead-out portion on the battery cell, and the second direction intersects with the first direction.

[0023] Optionally, it further comprises at least two connecting sheet assemblies, wherein at least two connecting sheet assemblies are connected to two sides of the plurality of battery cells along the first direction; wherein,

[0024] The connecting piece assembly includes a connecting piece bracket and a plurality of connecting pieces, the connecting piece connects the electrode lead-out parts of two adjacent battery cells, and the first circuit and the second circuit are respectively electrically connected to the connecting pieces located on both sides of the plurality of battery cells along the first direction.

[0025] Optionally, the connecting piece includes a main body and a bending portion, the main body connects the electrode lead-out portions of two adjacent battery cells, the bending portion is bent along the first direction toward the sampling component, and the first circuit and the second circuit are respectively electrically connected to the bending portions of the connecting piece located on both sides of the multiple battery cells along the first direction.

[0026] Optionally, the first circuit, the second circuit and the bending portion are electrically connected via a metal wire.

[0027] Optionally, the connecting plate bracket and the plurality of connecting plates are an integrally formed structure.

[0028] Optionally, the battery pack further comprises a power distribution component, which is electrically connected to the collector to receive the cell information collected by the collector; wherein the power distribution component is electrically connected to the collector via a metal wire, or the power distribution component is connected to the collector via a connector.

[0029] Optionally, the battery pack also includes a battery tray, the battery tray includes a tray bottom plate and a tray frame, the tray bottom plate and the tray frame are combined to form a accommodating cavity, the multiple battery cells are arranged in the accommodating cavity, and the substrate is connected to the battery cells and / or the battery tray.

[0030] Optionally, an adhesive layer is provided between the substrate and the battery cell, and the substrate and the battery cell are adhesively connected via the adhesive layer;

[0031] And / or, a first mounting hole is provided on the substrate, and a second mounting hole is provided on the tray frame, the first mounting hole and the second mounting hole are arranged relative to each other along a third direction, and are used to penetrate fasteners so that the substrate and the battery tray are connected through the fasteners.

[0032] In a third aspect, the present application also discloses an electrical device, including the battery pack or sampling assembly as described above.

[0033] In the embodiment of the present application, one end of the first circuit and the second circuit of the sampling device are connected to the collector, and the other end is respectively connected to the two electrode lead-out parts of the battery cell, so as to collect the battery cell information through the sampling device and transmit it to the collector to obtain various information of the battery cell. By connecting the sampling device and the collector to the substrate, the substrate can be used as the first circuit and the second circuit of the sampling device, as well as the carrier of the collector, which simplifies the fixed structure of the sampling circuit and avoids the problem of the sampling harness fixed structure occupying the internal space of the battery pack under the traditional sampling method; in addition, connecting the first circuit and the second circuit to the substrate can enhance the structural strength of the sampling device and ensure the stability of the circuit; because the collector is also connected to the substrate, the integrity of the sampling component is further improved, and the sampling reliability is improved.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 It is a schematic diagram of the structure of the sampling component in the embodiment of the present application;

[0037] Figure 2 It is a schematic diagram of the structure of the first circuit or the second circuit in an embodiment of the present application;

[0038] Figure 3 yes Figure 2 A magnified schematic diagram of the middle part;

[0039] Figure 4 This is a schematic diagram of the structure of the collector in the embodiment of the present application;

[0040] Figure 5 This is a schematic diagram of the connection between the first line or the second line and the collector in the embodiment of the present application;

[0041] Figure 6 This is a schematic diagram of the connection between collectors in an embodiment of the present application;

[0042] Figure 7 is an exploded schematic diagram of a battery pack in an embodiment of the present application;

[0043] Figure 8 is a schematic diagram of the connection between the first circuit or the second circuit and the connecting piece assembly in an embodiment of the present application;

[0044] Fig. 9 This is a schematic diagram of the structure of the connecting piece assembly in an embodiment of the present application;

[0045] Fig.10This is an exploded schematic diagram of a connecting piece assembly in an embodiment of the present application;

[0046] Fig.11 It is a schematic diagram of the connection between the distribution box and the collector in the embodiment of the present application.

[0047] Figure numerals: 100 - sampling assembly, 10 - substrate, 11 - first mounting hole, 12 - fastener, 20 - sampling piece, 21 - first circuit, 22 - second circuit, 23 - insulating film, 24 - first pad, 25 - sub-circuit, 30 - collector, 31 - third circuit, 32 - second pad, 33 - third pad, 34 - fourth pad, 40 - aluminum wire, 41 - arc portion, 42 - welding portion, 200 - battery cell, 201 - electrode lead portion, 300 - connecting piece assembly, 301 - connecting piece bracket, 302 - connecting piece, 3021 - body, 3022 - bending portion, 400 - power distribution assembly, 401 - connector, 500 - battery tray, 501 - tray bottom plate, 502 - tray frame, 5021 - second mounting hole, x - first direction, y - second direction, z - third direction. DETAILED DESCRIPTION

[0048] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0049] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0050] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 present application.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The traditional sampling structure in the battery pack uses a wiring harness as a signal connection path. Under the above connection method, it is necessary to consider the fixation of the wiring harness, which makes the sampling structure complex and occupies a large space. In addition, there is a sampling structure that uses a flexible printed circuit as a signal connection path, but the production and maintenance costs of the flexible printed circuit are high, which is not conducive to reducing production costs.

[0053] Based on this, the embodiment of the present application provides a sampling component, which is connected to the battery cell to collect various information such as the voltage, current, temperature, etc. of the battery cell, understand the operating status of the battery pack, provide an effective basis for the management of the battery pack, and ensure the operating quality of the battery pack during use. Through the sampling component provided by the embodiment of the present application, by connecting the sampling piece and the collector to the substrate, the substrate can be used as a carrier of the sampling piece and the collector, and play a bearing role for the sampling piece and the collector, thereby enhancing the integrity of the sampling piece and the collector and ensuring the sampling reliability; on the other hand, the substrate also serves as a medium for connecting the sampling component with the battery cell, and as a structural member to improve the overall rigidity of the battery pack.

[0054] The sampling component provided in the embodiment of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0055] In the embodiment of the present application, the first direction x is one of the length and width directions of the battery pack, the second direction y is the other of the length and width directions of the battery pack, and the third direction z is the height direction of the battery pack.

[0056] The sampling assembly 100 disclosed in the present application is used to collect information of a battery cell 200, wherein the battery cell 200 includes two electrode lead-out portions 201 arranged opposite to each other along a first direction x. Figure 1 As shown, the sampling component 100 includes a substrate 10, a sampling piece 20 and a collector 30. The sampling piece 20 and the collector 30 are connected to the substrate 10, wherein the substrate 10 is a composite material substrate 10 and has insulating properties. The substrate 10 can serve as a carrier for the sampling piece 20 and the collector 30, and play a bearing role for the sampling piece 20 and the collector 30, thereby enhancing the integrity of the sampling piece 20 and the collector 30 and ensuring the sampling reliability. On the other hand, the substrate 10 also serves as a medium for connecting the sampling component 100 with the battery cell 200, and serves as a structural member to enhance the overall rigidity of the battery pack.

[0057] Furthermore, the sampling component 20 includes a first circuit 21 and a second circuit 22, one end of the first circuit 21 and the second circuit 22 are connected to the collector 30, the other end of the first circuit 21 is used to connect to an electrode lead 201 on the battery cell 200, and the other end of the second circuit 22 is used to connect to another electrode lead 201 on the battery cell 200.

[0058] like Figure 7 As shown, in the battery pack provided in the embodiment of the present application, the electrode lead-out portions 201 of the battery cell 200 are arranged at two sides of the battery cell 200 in a direction x that is opposite to each other, as shown in FIG. Figure 1 , Figure 7 As shown, the first circuit 21 and the second circuit 22 are arranged on both sides of the substrate 10 along the first direction x, the first circuit 21 can be connected to one electrode lead-out portion 201 of the battery cell 200, and the second circuit 22 is connected to another electrode lead-out portion 201 of the battery cell 200, and the collector 30 is arranged between the first circuit 21 and the second circuit 22, so as to be electrically connected to the first circuit 21 and the second circuit 22 at the same time, so as to realize signal transmission between the battery cell 200 and the collector 30. It should be noted that in actual applications, the electrode lead-out portion 201 is used to realize the electrical connection between the first circuit 21, the second circuit 22 and the battery cell 200, and can specifically be the pole or cover of the battery cell 200.

[0059] Optionally, both the first circuit 21 and the second circuit 22 are flexible die-cut circuits, and an insulating film 23 is provided on at least one side of the flexible die-cut circuit facing away from the substrate 10 , and the insulating film 23 covers the first circuit 21 and the second circuit 22 .

[0060] Specifically, in the embodiment of the present application, the first circuit 21 and the second circuit 22 are formed by die-cutting aluminum foil to reduce the circuit cost, and the die-cutting shape can be freely adjusted; insulating films 23 are provided on both sides of the circuit, and the insulating films 23 are coated with hot pressing adhesive. The two layers of insulating films 23 wrap the aluminum foil to play the role of insulation protection and fixing the circuit to prevent the circuit from being damaged. It should be noted that in another optional embodiment, the first circuit 21 and the second circuit 22 can also be copper foil, and the insulating film 23 can be any one of a polyester film (PET film) and a polyimide film (PI film), and the present application does not make specific limitations on this.

[0061] In addition, the insulating film 23 may also be disposed only on one side of the first circuit 21 and the second circuit 22 away from the substrate 10 , while the other side is insulated by the substrate 10 .

[0062] It can be understood that when the first circuit 21 and the second circuit 22 adopt flexible die-cut circuits, the die-cutting process is simpler, which can improve the production efficiency of the first circuit 21 and the second circuit 22 and simplify the complexity of the sampling component 100. At the same time, the flexible die-cut circuit is smaller in size and can also reduce unnecessary space occupation and improve the energy density of the battery pack.

[0063] Optionally, the first circuit 21 , the second circuit 22 and the substrate 10 are integrally formed, thereby improving the overall stability and reliability of the sampling assembly 100 .

[0064] It is understandable that compared with traditional connection methods such as welding and plugging, which may have risks such as poor contact and looseness, affecting the accuracy and stability of the sampling signal, the integrated molding of the circuit and the substrate 10 reduces the failure rate caused by poor connection, thereby improving the durability and service life of the sampling component 100, and also simplifies the assembly cost of the sampling component 100, improves the integrity of the sampling component 100, and is conducive to improving the structural stability of the sampling component 100, thereby ensuring sampling reliability.

[0065] In an optional embodiment of the present application, the first circuit 21 and the second circuit 22 are connected to the substrate 10 by hot pressing through the insulating film 23. This method of hot pressing and fixing the first circuit 21 and the second circuit 22 to the substrate 10 through the insulating film 23 not only provides electrical isolation protection for the circuit, and prevents the potential safety hazards caused by short circuit of the circuit, but also eliminates the fixing structure between the circuit and the substrate 10, simplifies the structure of the sampling component 100, and is conducive to reducing the internal space of the battery pack occupied by the sampling component 100. When the volume of the battery pack is constant, the energy density of the battery pack can be effectively improved, and the battery life of the battery pack can be improved; in addition, the hot pressing and fixing method can also effectively ensure that a firm connection is formed between the circuit and the substrate 10, and effectively prevent the problem of loosening or falling off of the circuit due to vibration or external impact during the operation of the battery pack, thereby ensuring the stability and accuracy of the sampling signal.

[0066] Optionally, the first circuit 21, the second circuit 22 and the collector 30 are electrically connected through metal wires. The metal wires may have good flexibility and are easy to bend to meet the buffering deformation requirements under the vibration conditions of the battery pack, so as to prevent failure of the connection between the circuit and the collector 30, ensure the connection stability between the circuit and the collector 30, and improve the reliability of signal transmission.

[0067] Specifically, Figure 4 , Figure 5 As shown, the sub-circuit 25 of the first circuit 21 and the second circuit 22 is provided with a first pad 24 at one end close to the collector 30, and the collector 30 is provided with a second pad 32 at one side close to the sub-circuit 25 of the first circuit 21 and the second circuit 22, and the two ends of the metal wire are respectively connected to the first pad 24 and the second pad 32 to achieve electrical connection between the first circuit 21, the second circuit 22 and the collector 30. Wherein, in the case where the first circuit 21 and the second circuit 22 are flexible die-cut circuits, since the insulating film 23 is attached to the outside of the first circuit 21 and the second circuit 22, the first pad 24 can be formed by the opening at the end of the first circuit 21 and the second circuit 22 close to the collector 30, and the second pad 32 is a gold-plated pad.

[0068] Optionally, the metal wire is an aluminum wire 40. The aluminum wire 40 can meet the stress requirements and tensile test requirements of the connection, and has high reliability; the aluminum wire 40 can also replace the fuse and melt when a short circuit occurs in the line. At the same time, the aluminum wire 40 is repairable and can be repeatedly welded. When the aluminum wire 40 is broken, there is no need to replace the main body of the material, and only re-welding is required, and the repair cost is low.

[0069] It should be noted that, in specific applications, the metal wire may be made of copper, aluminum, gold, silver, alloys, etc., and this application does not make specific limitations on this.

[0070] Optionally, the first circuit 21 and the second circuit 22 are used to collect information of multiple battery cells 200, wherein the first circuit 21 and the second circuit 22 each include a plurality of sub-circuits 25 spaced apart along the second direction y, and one sub-circuit 25 is connected to an electrode lead-out portion 201 of a battery cell 200 to simplify the structure of a sampling component 100 in a battery pack.

[0071] Specifically, the multiple sub-circuits 25 in the first circuit 21 are spaced apart along the second direction y and insulated from each other, and the multiple sub-circuits 25 in the second circuit 22 are also spaced apart along the second direction y and insulated from each other. In this way, by respectively arranging the multiple sub-circuits 25 in the first circuit 21 and the second circuit 22, a single sampling component 100 can simultaneously collect information of multiple battery cells 200. When the sampling component 100 is connected to multiple battery cells 200, the redundancy and complexity of the structure caused by setting up multiple independent sampling components 100 can be avoided. In addition, the layout of the sub-circuits 25 can ensure that each sub-circuit 25 is connected to the electrode lead-out portion 201 of a battery cell 200, effectively avoiding interference and misconnection between circuits, thereby ensuring the accuracy and reliability of data collection.

[0072] Among them, Figure 2 , Figure 3 As shown, the shapes of the sub-circuits 25 in the first circuit 21 and the second circuit 22 can be designed with different widths according to the number of sampling chips in the collector 30 .

[0073] Optionally, the first line 21 and the second line 22 are respectively arranged on two sides of the collector 30 along the first direction x, thereby improving the rationality of the layout of the sampling component 100 .

[0074] like Figure 1 As shown, the length direction of the collector 30 is roughly arranged along the second direction y, the first line 21 and the second line 22 are respectively arranged on both sides of the collector 30 along the first direction x, and the collector 30 includes a first side and a second side arranged oppositely along the width direction, wherein the first side is close to the first line 21, and the second side is close to the second line 22, and the first side and the second side are both arranged with multiple second pads 32 at intervals along the length direction, the first line 21 is connected to the second pad 32 on the first side, and the second line 22 is connected to the second pad 32 on the second side. Under such a structure, the possibility of line crossing and interference is reduced, and when connecting the electrode lead-out part 201 of the battery cell 200, the operator can more intuitively and accurately identify and connect the corresponding line, thereby improving the accuracy and efficiency of the sampling process.

[0075] Optionally, there are multiple first lines 21 and multiple second lines 22, and the multiple first lines 21 are spaced apart along the second direction y, and the multiple second lines 22 are spaced apart along the second direction y, so as to enhance the flexibility of the sampling component 100 in collecting information of the battery cell 200.

[0076] In practical applications, the plurality of first lines 21 and the plurality of second lines 22 may be connected to one collector 30 or to a plurality of collectors 30. Figure 1 As shown, the number of the first lines 21 and the second lines 22 are equal and are arranged oppositely along the first direction x, and one first line 21 and one second line 22 are respectively connected to the two sides of a collector 30. Among them, by setting the number of the first lines 21 and the second lines 22 to multiple, it is conducive to the parallel collection of information of multiple battery cells 200, which can not only improve the data collection efficiency of the sampling component 100, but also reduce the mutual interference between the lines through the orderly arrangement of the lines, and improve the accuracy and stability of data collection.

[0077] In an optional embodiment of the present application, there are multiple collectors 30, and the multiple collectors 30 are arranged on the substrate 10 along the second direction y at intervals, and one collector 30 is used to connect a first circuit 21 and a second circuit 22; the sampling component 100 also includes a third circuit 31, and adjacent collectors 30 are electrically connected through the third circuit 31.

[0078] It is understandable that in order to realize the information collection of each battery cell 200 in the battery pack, the size of the collector 30 may be relatively large. By setting a plurality of collectors 30, the size of a single collector 30 can be reduced, thereby reducing the processing difficulty of the collector 30. In addition, each collector 30 corresponds to a first circuit 21 and a second circuit 22, which is conducive to simplifying the circuit structure of the sampling component 20. By dispersing the collection tasks, the burden of a single collector 30 is also reduced, thereby extending the overall service life of the sampling component 100.

[0079] Furthermore, the third circuit 31 is a flexible die-cut circuit, and the third circuit 31 is electrically connected to the collector 30 through a metal wire.

[0080] like Figure 6As shown, a third pad 33 is provided at one end of the third circuit 31 close to the collector 30, a fourth pad 34 is provided on one side of the collector 30 close to the third circuit 31, and two ends of the metal wire are respectively connected to the third pad 33 and the fourth pad 34 to achieve electrical connection between the third circuit 31 and the collector 30. Wherein, in the case where the third circuit 31 is a flexible die-cut circuit, since an insulating film 23 is attached to the outside of the third circuit 31, the third pad 33 can be formed by an opening at the end of the third circuit 31 close to the collector 30, and similarly, the fourth pad 34 can be a gold-plated pad.

[0081] It should be noted that when the third circuit 31 is a flexible die-cut circuit and the third circuit 31 is connected to the collector 30 through a metal wire, it can have the same or similar beneficial effects as when the first circuit 21 and the second circuit 22 are set as flexible die-cut circuits, which will not be repeated here.

[0082] Optionally, the metal wire is an aluminum wire 40. The aluminum wire 40 can meet the stress requirements and tensile test requirements of the connection, and has high reliability; the aluminum wire 40 can also replace the fuse, and will blow when a short circuit occurs in the line. At the same time, the aluminum wire 40 is repairable and can be repeatedly welded. When the aluminum wire 40 breaks, there is no need to replace the main body of the material, and only re-welding is required, and the repair cost is low. In practical applications, the metal wire can also be selected from copper wire, silver wire and other metal wires, and this application does not make specific restrictions on this.

[0083] Alternatively, if Figure 5 As shown, the aluminum wire 40 includes an arcuate portion 41 that is arched away from the substrate 10. Specifically, a first pad 24 is provided at one end of the first circuit 21 and the second circuit 22 close to the collector 30, and a second pad 32 is provided on the collector 30 close to the first circuit 21 and the second circuit 22. The aluminum wire 40 includes a welding portion 42 connected to the first pad 24 and the second pad 32, and an arcuate portion 41 connected between the welding portions 42. The welding portion 42 is attached to the first pad 24 and the second pad 32. The arcuate portion 41 is arched away from the substrate 10. The arcuate portion 41 can absorb the displacement during vibration. The height of the arched arcuate portion 41 can be set according to actual needs, so as to meet the requirements of buffering deformation during vibration of the battery pack, and effectively reduce the risk of breakage of the aluminum wire 40 caused by vibration.

[0084] In the embodiment of the present application, the diameter of the aluminum wire 40 is in the range of 3-8 mil. When the diameter of the aluminum wire 40 is small, high-density wiring can be achieved, and the weight of the aluminum wire 40 can be reduced, thereby reducing the cost.

[0085] In summary, the sampling component provided in the embodiment of the present application has at least the following advantages:

[0086] In the embodiment of the present application, one end of the first circuit and the second circuit of the sampling device are connected to the collector, and the other end is connected to the two poles of the battery cell, so as to collect the battery cell information through the sampling device and transmit it to the collector to obtain various information of the battery cell. By connecting the sampling device and the collector to the substrate, the substrate can be used as the first circuit and the second circuit of the sampling device, as well as the carrier of the collector, which simplifies the fixed structure of the sampling circuit and avoids the problem of the fixed structure of the sampling harness occupying the internal space of the battery pack under the traditional sampling method; in addition, connecting the first circuit and the second circuit to the substrate can enhance the structural strength of the sampling device and ensure the stability of the circuit; because the collector is also connected to the substrate, the integrity of the sampling component is further improved, and the sampling reliability is improved.

[0087] like Figure 7 As shown, the present application also discloses a battery pack, including multiple battery cells 200 and the above sampling component 100, the battery cell 200 includes two electrode lead-out portions 201 arranged opposite to each other along a first direction x, one end of the first circuit 21 and the second circuit 22 are connected to the collector 30, the other end of the first circuit 21 is connected to an electrode lead-out portion 201 on the battery cell 200, and the other end of the second circuit 22 is connected to another electrode lead-out portion 201 on the battery cell 200.

[0088] It should be noted that by using the sampling assembly 100 as described above to collect information of multiple battery cells 200 in the battery pack, the internal space of the battery pack is saved, and the sampling assembly 100 has a high structural strength, thereby ensuring the reliability of sampling.

[0089] Specifically, the battery pack also includes a battery tray 500, which is formed by welding a tray bottom plate 501 and a tray frame 502. The tray bottom plate 501 and the tray frame 502 enclose a receiving cavity for placing the battery cell 200. A plurality of battery cells 200 are placed in the receiving cavity and fixed to the tray bottom plate 501 by structural adhesive. The substrate 10 of the sampling assembly 100 is connected to the battery cell 200 and / or the battery tray 500.

[0090] It is understandable that the sampling assembly 100 is connected to the battery cell 200 and / or the battery tray 500 through the substrate 10, so that the connection method of the sampling assembly 100 and the battery pack is more flexible. Specifically, the sampling assembly 100 can be connected to the battery cell 200, can also be connected to the battery tray 500, and can also be connected to the battery cell 200 and the battery tray 500 at the same time. It should be noted that the connection of the substrate 10 of the sampling assembly 100 to the battery cell 200 and / or the battery tray 500 described herein refers to the mechanical connection between the substrate 10 and the battery cell 200 and / or the battery tray 500. By mechanically connecting the substrate 10 to the battery cell 200 and / or the battery tray 500, it is beneficial to maintain the relative position of the sampling assembly 100 with the battery cell 200 and the battery tray 500 in the battery pack, ensure the connection strength between the sampling assembly 100 and the battery cell 200, and avoid the sampling reliability being affected by the movement of the sampling assembly 100 caused by the vibration of the battery pack.

[0091] Optionally, an adhesive layer is provided between the substrate 10 and the battery cell 200, and the substrate 10 and the battery cell 200 are adhesively connected through the adhesive layer; and / or, a first mounting hole 11 is provided on the substrate 10, and a second mounting hole 5021 is provided on the tray frame 502, the first mounting hole 11 and the second mounting hole 5021 are arranged relative to each other along a third direction z, and are used to penetrate fasteners 12, so that the substrate 10 and the battery cell 200 are connected through the fasteners 12.

[0092] like Figure 7 As shown, the sampling component 100 is connected to the side of the multiple battery cells 200 away from the tray bottom plate 501, wherein the substrate 10 in the sampling component 100 is fixedly connected to the battery cells 200 and at least one of the battery tray 500. Specifically, an adhesive layer can be set between the substrate 10 and the upper surface of the battery cell 200, and the substrate 10 is adhesively connected to the upper surface of the battery cell 200 through the adhesive layer; in addition, the substrate 10 can also be provided with a first mounting hole 11 at the edge, and a second mounting hole 5021 is provided on the tray frame 502, and the first mounting hole 11 and the second mounting hole 5021 are arranged relative to each other along the third direction z. In actual applications, the fastener 12 can be passed through the first mounting hole 11 and the second mounting hole 5021, so that the substrate 10 and the battery tray 500 are connected through the fastener 12.

[0093] In the embodiment of the present application, an adhesive layer is provided between the substrate 10 and the battery cell 200 for adhesive connection. At the same time, the substrate 10 and the tray frame 502 are also connected through the fastener 12 passing through the first mounting hole 11 and the second mounting hole 5021, so that the sampling assembly 100, the battery cell 200 and the tray form a stacking structure, thereby improving the overall strength of the battery pack and the connection strength between the sampling assembly 100 and the battery cell 200. In a specific application, the first mounting hole 11 is a through hole that penetrates the substrate 10 along the third direction z, and the fastener 12 can be a rivet or a bolt, which is not specifically limited in the present application.

[0094] Furthermore, the battery pack further includes a connecting sheet assembly 300, at least two connecting sheet assemblies 300 are connected to two sides of the plurality of battery cells 200 along the first direction x; Fig. 9 , Fig.10 As shown, the connecting piece assembly 300 includes a connecting piece bracket 301 and a plurality of connecting pieces 302. Figure 8 As shown, the connecting piece 302 connects the electrode lead-out portions 201 of two adjacent battery cells 200 , and the first circuit 21 and the second circuit 22 are electrically connected to the connecting piece 302 located on both sides of the plurality of battery cells 200 along the first direction x.

[0095] In actual applications, the connecting piece bracket 301 is arranged on one side of the multiple battery cells 200 along the first direction x, and the connecting piece 302 is connected to the connecting piece bracket 301. The connecting piece bracket 301 can provide a certain support for the connecting piece 302, thereby ensuring the connection effect of the connecting piece 302 on the electrode lead-out parts 201 of adjacent battery cells 200, preventing the displacement between adjacent battery cells 200 when the battery pack vibrates, causing the connecting piece 302 to fail, and ensuring the connection reliability between the battery cells 200 in the overall structure of the battery pack.

[0096] Optionally, the connecting piece 302 includes a main body 3021 and a bending portion 3022, the main body 3021 connects the electrode lead-out portions 201 of two adjacent battery cells 200, the bending portion 3022 is bent along the first direction x toward the sampling component 100, and the first circuit 21 and the second circuit 22 are respectively electrically connected to the bending portion 3022 of the connecting piece 302 located on both sides of the multiple battery cells 200 along the first direction x.

[0097] Specifically, the body 3021 of the connecting piece 302 is arranged on one side of the battery cell 200 along the first direction x, and is connected to the electrode lead-out parts 201 of two adjacent battery cells 200. In practical applications, the body 3021 of the connecting piece 302 and the electrode lead-out parts 201 of the battery cell 200 can be connected by laser welding. Since the first circuit 21 and the second circuit 22 are connected to the connecting piece 302 by aluminum wire 40 in the embodiment of the present application, when the bending part 3022 is bent along the first direction x toward the sampling component 100, the connection between the first circuit 21, the second circuit 22 and the connecting piece 302 can be facilitated, and the aluminum wire 40 is prevented from bending at the edge of the battery cell 200, causing wear and breakage in the later stage.

[0098] In the embodiment of the present application, the first circuit 21 , the second circuit 22 and the bending portion 3022 are electrically connected via a metal wire, and the metal wire may be an aluminum wire 40 .

[0099] It should be noted that when the first circuit 21, the second circuit 22 and the bending portion 3022 are electrically connected through a metal wire, they can have the same or similar beneficial effects as the collector 30 being electrically connected through a metal wire. When the metal wire is selected as an aluminum wire 40, the aluminum wire 40 can also achieve the aforementioned beneficial effects, which will not be repeated here.

[0100] Optionally, the connecting piece bracket 301 and the plurality of connecting pieces 302 are integrally formed, thereby improving the structural integrity of the connecting piece assembly 300 and ensuring the connection effect between the connector assembly and the battery cell 200 .

[0101] In actual applications, the connecting piece 302 can be an aluminum sheet, and the connecting piece bracket 301 is made of polyphenylene ether plastic material (PPO). The connecting piece 302 can be processed by a stamping process. The formed multiple connecting pieces 302 are placed in an injection mold for injection molding. The cooled plastic material forms the connecting piece bracket 301, and finally forms a connecting piece assembly 300 in which the connecting piece bracket 301 and multiple connecting pieces 302 are an integrated structure.

[0102] It can be understood that since the connecting piece bracket 301 and the multiple connecting pieces 302 are an integrally formed structure, the distance between the connecting pieces 302 is more stable, which is beneficial to improving the connection reliability of the connecting piece 302 to the adjacent battery cells 200. At the same time, the connecting piece 302 and the connecting piece bracket 301 made of plastic are integrally injection molded, which can improve assembly efficiency and enhance structural strength to prevent the aluminum wire 40 from breaking during vibration.

[0103] Furthermore, if Fig.11As shown, the battery pack also includes a power distribution component 400, which can provide charge and discharge control, protection and monitoring for the battery pack. The power distribution component 400 is electrically connected to the collector 30 to receive the battery cell 200 information collected by the collector 30. Optionally, the power distribution component 400 is electrically connected to the collector 30 through a metal wire, or the power distribution component 400 is connected to the collector 30 through a connector 401. The embodiment of the present application does not specifically limit the connection method between the power distribution component 400 and the collector 30, and can be selected according to actual needs in actual applications.

[0104] The present application also discloses an electrical device, including the above-mentioned battery pack or sampling component 100, wherein the battery pack can be used as a power supply for the electrical device, and the sampling component 100 can collect various information such as the voltage, current, and temperature of the battery cell 200 in the battery pack, understand the operating status of the battery pack, provide an effective basis for the management of the battery pack, ensure the operating quality of the battery pack during use, and further ensure the safety and reliability of the operation of the electrical device. The electrical devices provided in the embodiments of the present application include but are not limited to industrial products such as new energy vehicles, energy storage systems, household appliances, and drones. The present application does not specifically limit the type of electrical devices.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sampling assembly for collecting information of a battery cell, wherein the battery cell comprises two electrode lead-out portions arranged opposite to each other along a first direction, characterized in that: The sampling assembly includes a base plate, a sampling member and a collector; wherein, The sampling component and the collector are connected to the substrate, and the sampling component includes a first circuit and a second circuit. One end of the first circuit and the second circuit are connected to the collector, the other end of the first circuit is used to connect to one of the electrode lead-out parts on the battery cell, and the other end of the second circuit is used to connect to another electrode lead-out part on the battery cell.

2. The sampling assembly according to claim 1, characterized in that: The first circuit and the second circuit are both flexible die-cut circuits. An insulating film is provided on at least one side of the flexible die-cut circuit away from the substrate, and the insulating film covers the first circuit and the second circuit.

3. The sampling assembly according to claim 2, characterized in that: The first circuit, the second circuit and the substrate are an integrally formed structure.

4. The sampling assembly according to claim 2, characterized in that: The first circuit and the second circuit are fixedly connected to the substrate through the insulating film by thermal pressing.

5. The sampling assembly according to claim 1, characterized in that: The first circuit, the second circuit and the collector are electrically connected through metal wires.

6. The sampling assembly according to claim 5, characterized in that: The first circuit and the second circuit are used to collect information of the plurality of battery cells, wherein the first circuit and the second circuit each include a plurality of sub-circuits spaced apart along a second direction, one of the sub-circuits is connected to the electrode lead-out portion of one of the battery cells, and the second direction intersects with the first direction.

7. The sampling assembly according to claim 6, characterized in that: The sub-circuit is provided with a first pad at one end close to the collector, and the collector is provided with a second pad at one end close to the sub-circuit, and the first pad is electrically connected to the second pad through the metal wire.

8. The sampling assembly according to claim 1, characterized in that: The first line and the second line are respectively arranged on two sides of the collector along the first direction.

9. The sampling assembly according to claim 1, characterized in that: There are multiple first lines and multiple second lines, multiple first lines are arranged at intervals along the second direction, multiple second lines are arranged at intervals along the second direction, and the second direction intersects the first direction.

10. The sampling assembly according to claim 9, characterized in that: There are multiple collectors, which are spaced apart on the substrate along the second direction, and one collector is used to connect one first circuit and one second circuit; the sampling component also includes a third circuit, and adjacent collectors are electrically connected through the third circuit.

11. The sampling assembly according to claim 10, characterized in that: The third circuit is a flexible die-cut circuit, and the third circuit is electrically connected to the collector through a metal wire.

12. The sampling assembly according to claim 11, characterized in that: A third pad is disposed on the third circuit, a fourth pad is disposed on the collector, and the third pad is electrically connected to the fourth pad through the metal wire.

13. The sampling assembly according to claim 5, 7, 11 or 12, characterized in that: The metal wire is an aluminum wire.

14. The sampling assembly according to claim 13, characterized in that: The aluminum wire includes an arc-shaped portion arched away from the substrate.

15. The sampling assembly according to claim 13, characterized in that: The diameter of the aluminum wire is in the range of 3-8 mil.

16. A battery pack, characterized in that: It comprises a plurality of battery cells and a sampling assembly as claimed in any one of claims 1 to 15, wherein the plurality of battery cells are arranged in sequence along a second direction, the battery cell comprises two electrode lead-out portions arranged opposite to each other along a first direction, one end of the first circuit and the second circuit are connected to the collector, the other end of the first circuit is connected to one of the electrode lead-out portions on the battery cell, the other end of the second circuit is connected to another of the electrode lead-out portions on the battery cell, and the second direction intersects with the first direction.

17. The battery pack according to claim 16, characterized in that: It also includes at least two connecting sheet assemblies, at least two of which are connected to two sides of the plurality of battery cells along the first direction; wherein, The connecting piece assembly includes a connecting piece bracket and a plurality of connecting pieces, the connecting piece connects the electrode lead-out parts of two adjacent battery cells, and the first circuit and the second circuit are respectively electrically connected to the connecting pieces located on both sides of the plurality of battery cells along the first direction.

18. The battery pack according to claim 17, characterized in that: The connecting piece includes a main body and a bending portion, the main body connects the electrode lead-out portions of two adjacent battery cells, the bending portion bends along the first direction toward the sampling component, and the first circuit and the second circuit are respectively electrically connected to the bending portions of the connecting piece located on both sides of the multiple battery cells along the first direction.

19. The battery pack according to claim 18, characterized in that: The first circuit, the second circuit and the bending portion are electrically connected through a metal wire.

20. The battery pack according to any one of claims 17 to 19, characterized in that: The connecting piece bracket and the plurality of connecting pieces are an integrally formed structure.

21. The battery pack according to any one of claims 17 to 19, characterized in that: The battery pack further comprises a power distribution component, which is electrically connected to the collector to receive the cell information collected by the collector; wherein the power distribution component is electrically connected to the collector via a metal wire, or the power distribution component is connected to the collector via a connector.

22. The battery pack according to any one of claims 16 to 19, characterized in that: The battery pack also includes a battery tray, which includes a tray bottom plate and a tray frame. The tray bottom plate and the tray frame are combined to form a receiving cavity. A plurality of battery cells are arranged in the receiving cavity. The substrate is connected to the battery cells and / or the battery tray.

23. The battery pack according to claim 22, characterized in that: An adhesive layer is provided between the substrate and the battery cell, and the substrate and the battery cell are bonded and connected via the adhesive layer; And / or, a first mounting hole is provided on the substrate, and a second mounting hole is provided on the tray frame, the first mounting hole and the second mounting hole are arranged relative to each other along a third direction, and are used to penetrate fasteners so that the substrate and the battery tray are connected through the fasteners.

24. An electrical equipment, characterized in that: Comprising a battery pack as described in any one of claims 16 to 22, or a sampling assembly as described in any one of claims 1 to 15.

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