Battery pack and electric device

Abstract

The utility model provides a battery pack and an electric device, and relates to the technical field of batteries. In the battery pack, a battery pack comprises a plurality of battery monomers arranged along a first direction; the busbar is electrically connected with any two adjacent single batteries in the plurality of battery packs respectively; the sampling module comprises a main sampling line, a temperature sampling line and a plurality of voltage sampling lines, the main sampling line and the busbar are located on the same side of the single batteries in the third direction, the main sampling line comprises a main sampling conductor, the temperature sampling line comprises a temperature sampling conductor and a temperature sampling element which are connected, and the temperature sampling conductor is welded to the main sampling conductor; the temperature sampling element is connected with the battery monomer, the voltage sampling line comprises a voltage sampling conductor, and the voltage sampling conductor is welded with the main sampling conductor and is electrically connected with the busbar. Through the above design, temperature and voltage sampling can be carried out at any point position, sampling is more flexible, the method is suitable for battery packs of various string numbers, and platform expansion application is facilitated.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Technology

[0002] As the performance requirements of electric vehicles increase, battery packs need a larger platform voltage, and the number of battery cells in each battery pack also increases accordingly. Based on this, how to flexibly sample the voltage and temperature of battery cells has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack and power supply device that aims to solve the technical problem of how to achieve flexible sampling of voltage and temperature.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] In a first aspect, embodiments of this application provide a battery pack having a first direction, a second direction, and a third direction that are mutually perpendicular to each other, comprising: multiple battery packs arranged along the second direction, each battery pack including multiple battery cells arranged along the first direction; multiple busbars, each busbar being electrically connected to any two adjacent battery cells in the multiple battery packs; and multiple sampling modules arranged at intervals along the second direction, each sampling module corresponding to one battery pack, each sampling module including a main sampling line, a temperature sampling line, and multiple voltage sampling lines, the main sampling line and the busbars being located on the same side of the battery cells along the third direction, the main sampling line including a main sampling conductor, the temperature sampling line including a connected temperature sampling conductor and a temperature sampling element, the temperature sampling conductor being welded to the main sampling conductor, the temperature sampling element being connected to the battery cell, and the voltage sampling line including a voltage sampling conductor, the voltage sampling conductor being welded to the main sampling conductor and electrically connected to the busbars.

[0006] The battery pack provided in this application, when assembled, allows for arbitrary temperature and voltage sampling at any desired location. The temperature sampling conductor and voltage sampling conductor are welded to the main sampling conductor, and the temperature sampling element is connected to the individual battery cells, while the voltage sampling conductor is electrically connected to the busbar. In this process, since the main sampling line is the main harness, and both the temperature and voltage sampling lines are branch harnesses, and the branch harnesses are electrically connected to the main harness via welding, this facilitates temperature and voltage sampling at any point, making sampling more flexible and suitable for battery packs with various series configurations, thus aiding in platform-based application expansion.

[0007] In some embodiments of the first aspect, the main sampling conductor includes a plurality of main sampling wires spaced apart along the second direction, the temperature sampling element includes a first pin and a second pin, the temperature sampling conductor includes a first temperature sampling wire and a second temperature sampling wire, the first temperature sampling wire is connected to the first pin, the second temperature sampling wire is connected to the second pin, and the first temperature sampling wire, the second temperature sampling wire and the voltage sampling conductor are respectively soldered to different main sampling wires.

[0008] In some embodiments of the first aspect, the main sampling line further includes a first insulator covering the main sampling conductor, the first insulator having a first opening, a second opening and a plurality of third openings, the first temperature sampling wire being welded to the main sampling wire exposed in the first opening, the second temperature sampling wire being welded to the main sampling wire exposed in the second opening, and the voltage sampling conductor of one voltage sampling line corresponding to one of the third openings and being welded to the main sampling wire exposed in the third opening.

[0009] In some embodiments of the first aspect, the voltage sampling conductor includes a first conductive portion, a first fused portion, and a second conductive portion, the first conductive portion being welded to the main sampling wire exposed in the third opening, the second conductive portion being electrically connected to the bus, and the first fused portion being connected between the first conductive portion and the second conductive portion.

[0010] In some embodiments of the first aspect, the first conductive portion has a plurality of welding zones spaced apart along the second direction, the welding zones having a plurality of welding holes spaced apart along the first direction, the welding holes penetrating the first conductive portion along the third direction, and the welding holes and the main sampling wire being disposed opposite to each other along the third direction.

[0011] In some embodiments of the first aspect, the first temperature sampling wire includes a third conductive portion, a second fusible portion, and a fourth conductive portion, the third conductive portion being soldered to the main sampling wire, the fourth conductive portion being connected to the first pin, and the second fusible portion being connected between the third conductive portion and the fourth conductive portion; and / or, the second temperature sampling wire includes a fifth conductive portion, a third fusible portion, and a sixth conductive portion, the fifth conductive portion being soldered to the main sampling wire, the sixth conductive portion being connected to the second pin, and the third fusible portion being connected between the fifth conductive portion and the sixth conductive portion.

[0012] In some embodiments of the first aspect, the battery cell includes an end cap, a positive terminal, and a negative terminal, both of which are disposed on the end cap; in any two adjacent battery cells in a plurality of battery packs, the busbar is electrically connected to the positive terminal of one of the battery cells and electrically connected to the negative terminal of the other battery cell, and the temperature sampling element is connected to the end cap.

[0013] In some embodiments of the first aspect, the sampling module further includes a thermally conductive adhesive layer located between the end cap and the temperature sampling element along the third direction, the thermally conductive adhesive layer being bonded to the end cap and the temperature sampling element respectively.

[0014] In some embodiments of the first aspect, the battery pack further includes an electrical isolation plate disposed between the end cap and the main sampling line along the third direction, the battery cell further includes an outer insulating layer covering the end cap, the electrical isolation plate has a first clearance hole penetrating along the third direction, the outer insulating layer has a second clearance hole penetrating along the third direction, the first clearance hole and the second clearance hole are disposed opposite to each other along the third direction, and the thermally conductive adhesive layer passes through the first clearance hole and the second clearance hole respectively.

[0015] Secondly, embodiments of this application provide an electrical device including the battery pack described in any of the embodiments of the first aspect above.

[0016] The electrical device provided in this application has all the beneficial effects of a battery pack because it includes the battery pack in any of the above embodiments.

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional structural schematic diagram of the battery pack in an embodiment of this application is shown;

[0020] Figure 2 It shows when Figure 1 A 3D structural diagram showing the busbar and battery pack concealed.

[0021] Figure 3 It shows Figure 2 Enlarged structural diagram of region A in the middle;

[0022] Figure 4 It shows Figure 1 A three-dimensional structural diagram of the busbar, battery cell, voltage sampling line, and temperature sampling line;

[0023] Figure 5 It shows Figure 4 A three-dimensional structural diagram of a single battery cell;

[0024] Figure 6 It shows Figure 1 A partial structural diagram of the mid-sampling module from one perspective;

[0025] Figure 7 It shows Figure 6 A partial structural diagram of the central main sampling line from one perspective;

[0026] Figure 8 It shows Figure 6 A schematic diagram of the structure of a medium voltage sampling line from one perspective;

[0027] Figure 9 It shows Figure 6 A schematic diagram of the structure of the medium-temperature sampling line from one perspective.

[0028] Explanation of key component symbols:

[0029] 1000 - Battery pack; 100 - Battery group; 110 - Battery cell; 111 - End cap; 112 - Positive terminal; 113 - Negative terminal; 114 - Outer insulation layer; 1141 - Second clearance hole; 200 - Busbar; 300 - Sampling module; 310 - Main sampling line; 311 - Main sampling conductor; 3111 - Main sampling wire; 312 - First insulator; 3121 - First opening; 3122 - Second opening; 3123 - Third opening; 320 - Temperature sampling line; 321 - Temperature sampling conductor; 3211 - First temperature sampling wire; 32111 - Third conductive part; 32112 - Second fuse part; 32113 - Fourth conductive part; 3212 - Second Temperature sampling wire; 32121-Fifth conductive part; 32122-Third fusible part; 32123-Sixth conductive part; 322-Temperature sampling element; 3221-First pin; 3222-Second pin; 323-Third insulator; 330-Voltage sampling line; 331-Voltage sampling conductor; 3311-First conductive part; 3312-First fusible part; 3313-Second conductive part; 3314-Soldering area; 33141-Soldering hole; 332-Second insulator; 3321-Fourth opening; 340-Thermal conductive adhesive layer; 350-Connector; 400-Electrical isolation plate; 410-First clearance hole; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, the term "multiple" means two or more, unless otherwise explicitly defined.

[0034] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to non-detachable connections (e.g., welding, riveting, etc.), detachable connections (e.g., snap-fit, screw-fit, plug-in, etc.), or integral structures; they can refer to mechanical connections or electrical connections (e.g., welding, snap-fit, adhesive, screw connections, etc.); they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0036] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0037] As the performance requirements of electric vehicles increase, battery packs need higher platform voltages, and the number of battery cells in each battery pack also increases accordingly. Therefore, how to flexibly sample the voltage and temperature of individual battery cells has become a pressing technical problem in this field. In related technologies, the sampling module of the battery pack is a one-piece molded structure with a single sampling method, only applicable to battery packs with a specific number of cells, thus hindering platform-based expansion applications.

[0038] In addition, the battery cells in the related technologies also have the following problems: 1. The fuse in the sampling module is not conducive to observing the melting situation and thus troubleshooting; 2. The sensitivity and accuracy of temperature sampling are insufficient.

[0039] like Figure 1 As shown, in order to solve the above-mentioned technical problems, the embodiments of this application provide a battery pack 1000, which relates to the field of battery technology and is mainly applied to electrical devices or energy storage devices.

[0040] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0041] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the battery pack 1000 provided in this embodiment has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other. The battery pack 1000 includes: a plurality of battery groups 100, a plurality of busbars 200 and a plurality of sampling modules 300.

[0042] In this configuration, multiple battery packs 100 are arranged along a second direction Y, and each battery pack 100 includes multiple battery cells 110 arranged along a first direction X. A busbar 200 is electrically connected to any two adjacent battery cells 110 in the multiple battery packs 100. Multiple sampling modules 300 are arranged at intervals along the second direction Y, with one sampling module 300 corresponding to one battery pack 100. Each sampling module 300 includes a main sampling line 310, a temperature sampling line 320, and multiple voltage sampling lines 330. The main sampling line 310 and the busbar 200 are connected to each other. Busbar 200 is located on the same side of battery cell 110 along the third direction Z. Main sampling line 310 includes main sampling conductor 311. Temperature sampling line 320 includes temperature sampling conductor 321 and temperature sampling element 322 connected together. Temperature sampling conductor 321 is welded to main sampling conductor 311. Temperature sampling element 322 is connected to battery cell 110. Voltage sampling line 330 includes voltage sampling conductor 331. Voltage sampling conductor 331 is welded to main sampling conductor 311 and electrically connected to busbar 200.

[0043] For example, the materials of the bus 200, the main sampling conductor 311, the temperature sampling conductor 321, and the voltage sampling conductor 331 can be selected as: metallic conductive materials (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (e.g., carbon-based materials, superconductors, semiconductors, etc.), without specific limitations.

[0044] For example, the temperature sampling element 322 is a negative temperature coefficient thermistor (NTC). Of course, the temperature sampling element 322 can also be a positive temperature coefficient thermistor (PTC), and no specific limitation is made here.

[0045] It is understood that when assembling the battery pack 1000 provided in this embodiment, at any position where temperature and voltage sampling is required, the temperature sampling conductor 321 and the voltage sampling conductor 331 are respectively welded to the main sampling conductor 311, and the temperature sampling element 322 is connected to the battery cell 110 and the voltage sampling conductor 331 is electrically connected to the bus 200.

[0046] In this process, since the main sampling line 310 is the main wire harness, and the temperature sampling line 320 and voltage sampling line 330 are both branch wire harnesses, and the branch wire harnesses and the main wire harness are electrically connected by welding, this helps to sample temperature and voltage at any point, making sampling more flexible and suitable for battery packs with various series numbers 1000, which helps to expand applications on a platform.

[0047] It should be noted that in the battery pack 1000, each busbar 200 is electrically connected to any two adjacent battery cells 110 in the multiple battery groups 100, so that all battery cells 110 of the battery pack 1000 can be connected in series through multiple busbars 200.

[0048] like Figure 4 As shown, in a portion of the multiple busbars 200, one busbar 200 is electrically connected to two adjacent battery cells 110 from the same battery pack 100 to realize series connection between battery cells 110 in the same battery pack 100. For this portion of the busbars 200, one busbar 200 corresponds to one voltage sampling line 330. Since the potential difference at different positions on the busbar 200 is small, it can be understood as being at the same potential. Therefore, two voltage sampling lines 330 correspond to the acquisition of the voltage of one battery cell 110.

[0049] In another part of the multiple busbars 200, one busbar 200 is electrically connected to two adjacent battery cells 110 from different battery packs 100 to realize series connection between battery cells 110 of different battery packs 100 (series connection across battery packs 100); for this part of the busbar 200, one busbar 200 corresponds to two voltage sampling lines 330, and the two voltage sampling lines 330 are respectively located on both sides of the busbar 200 along the second direction Y.

[0050] like Figure 6 and Figure 9 As shown, in some embodiments, the main sampling conductor 311 includes a plurality of main sampling wires 3111 arranged at intervals along the second direction Y. The temperature sampling element 322 includes a first pin 3221 and a second pin 3222. The temperature sampling conductor 321 includes a first temperature sampling wire 3211 and a second temperature sampling wire 3212. The first temperature sampling wire 3211 is connected to the first pin 3221, and the second temperature sampling wire 3212 is connected to the second pin 3222. The first temperature sampling wire 3211, the second temperature sampling wire 3212, and the voltage sampling conductor 331 are respectively soldered to different main sampling wires 3111.

[0051] It should be noted that "the first temperature sampling conductor 3211, the second temperature sampling conductor 3212, and the voltage sampling conductor 331 are respectively welded to different main sampling conductors 3111" means that the first temperature sampling conductor 3211 is welded to one of the main sampling conductors 3111, the second temperature sampling conductor 3212 is welded to another main sampling conductor 3111, and the voltage sampling conductor 331 is welded to yet another main sampling conductor 3111. That is, the first temperature sampling conductor 3211, the second temperature sampling conductor 3212, and the voltage sampling conductor 331 each correspond to a different main sampling conductor 3111.

[0052] It is understandable that by welding the first temperature sampling wire 3211, the second temperature sampling wire 3212, and the voltage sampling conductor 331 to different main sampling wires 3111 respectively, the temperature sampling line 320 and the voltage sampling line 330 can be made independent, which helps to perform voltage and temperature sampling more accurately.

[0053] like Figure 2 , Figure 6 and Figure 7 As shown, the main sampling line 310 further includes a first insulator 312 covering the main sampling conductor 311. The first insulator 312 is provided with a first opening 3121, a second opening 3122 and a plurality of third openings 3123. The first temperature sampling wire 3211 is welded to the main sampling wire 3111 exposed in the first opening 3121, and the second temperature sampling wire 3212 is welded to the main sampling wire 3111 exposed in the second opening 3122. The voltage sampling conductor 331 of a voltage sampling line 330 corresponds to a third opening 3123 and is welded to the main sampling wire 3111 exposed in the third opening 3123.

[0054] It is understandable that by setting the first insulator 312, the main sampling conductor 311 can be insulated from the outside to reduce the risk of short circuit; by setting the first opening 3121, the second opening 3122 and the third opening 3123, different main sampling wires 3111 can be exposed respectively, which makes it convenient to weld the first temperature sampling wire 3211, the second temperature sampling wire 3212 and the voltage sampling wire to the main sampling conductor 311 when assembling the sampling module 300.

[0055] It should be noted that when the main sampling line 310 is a flexible flat cable (FFC), the first insulator 312 includes an insulating substrate layer and an adhesive layer. The insulating substrate layer is wrapped around the main sampling conductor 311 and is bonded to the main sampling conductor 311 through the adhesive layer.

[0056] For example, the material of the insulating substrate layer can be polyimide (PI), polyethylene terephthalate (PET), etc.; the adhesive layer can be a hot melt adhesive layer, an adhesive layer, etc., without specific limitations.

[0057] It should be noted that a dispensing design can be used at the welding position. That is, the sampling module 300 also includes an insulating adhesive layer, which covers the first opening 3121, the second opening 3122 and the third opening 3123, thereby playing an insulating role and reinforcing the welding position.

[0058] like Figures 6 to 8 As shown, the voltage sampling conductor 331 further includes a first conductive part 3311, a first fusible part 3312, and a second conductive part 3313. The first conductive part 3311 is welded to the main sampling wire 3111 exposed in the third opening 3123, the second conductive part 3313 is electrically connected to the bus 200, and the first fusible part 3312 is connected between the first conductive part 3311 and the second conductive part 3313.

[0059] It is understandable that the first fuse 3312 can fuse when the fusing current is reached, thereby protecting the circuit. By placing the first fuse 3312 in the voltage sampling line 330, it is easier to observe the location of the fuse than to place it in the main sampling line 310, which helps in troubleshooting. At the same time, if any voltage sampling line 330 fuses, the entire voltage sampling line 330 can be replaced, thereby ensuring the functional integrity of the main sampling line 310 and the temperature sampling line 320.

[0060] like Figures 6 to 8 As shown, the first conductive part 3311 further includes a plurality of welding areas 3314 arranged at intervals along the second direction Y, and the welding areas 3314 include a plurality of welding holes 33141 arranged at intervals along the first direction X. The welding holes 33141 penetrate the first conductive part 3311 along the third direction Z, and the welding holes 33141 and the main sampling wire 3111 are arranged opposite to each other along the third direction Z.

[0061] It is understandable that by setting multiple welding areas 3314 arranged at intervals along the second direction Y, the first conductive part 3311 can be welded to the main sampling wire 3111 at any welding area 3314, thereby facilitating the flexible adjustment of the position of the voltage sampling line 330 as needed, thus improving the flexibility of voltage sampling; by setting multiple welding holes 33141, the welding holes 33141 help the reasonable flow and cooling of the solder during welding, thereby helping to improve the welding quality.

[0062] like Figures 6 to 8 As shown, the voltage sampling line 330 further includes a second insulator 332, which covers the voltage sampling conductor 331. The second insulator 332 is provided with a plurality of fourth openings 3321 arranged at intervals along the second direction Y. The welding area 3314 and the fourth openings 3321 are arranged opposite to each other along the third direction Z. The welding hole 33141 communicates with the fourth openings 3321. The portion of the first conductive part 3311 exposed in the fourth openings 3321 is welded to the main sampling wire 3111.

[0063] It is understandable that by setting the second insulator 332, the voltage sampling conductor 331 can be insulated from the outside, thereby reducing the risk of short circuit; by setting the fourth opening 3321, the first conductive part 3311 can be exposed, thereby facilitating the welding of the first conductive part 3311 to the main sampling wire 3111.

[0064] like Figure 6 and Figure 9 As shown, the temperature sampling line 320 further includes a third insulator 323, which covers the temperature sampling conductor 321 and the temperature sampling element 322 to provide insulation and reduce the risk of short circuit. The temperature sampling element 322 is partially exposed to the third insulator 323 for connection to the battery cell 110. The first temperature sampling wire 3211 and the second temperature sampling wire 3212 are both partially exposed to the third insulator 323 for welding to the main sampling wire 3111.

[0065] like Figure 6 , Figure 7 and Figure 9 As shown, the first temperature sampling wire 3211 further includes a third conductive part 32111, a second fusible part 32112, and a fourth conductive part 32113. The third conductive part 32111 is soldered to the main sampling wire 3111, the fourth conductive part 32113 is connected to the first pin 3221, and the second fusible part 32112 is connected between the third conductive part 32111 and the fourth conductive part 32113; and / or, the second temperature sampling wire 3212 includes a fifth conductive part 32121, a third fusible part 32122, and a sixth conductive part 32123. The fifth conductive part 32121 is soldered to the main sampling wire 3111, the sixth conductive part 32123 is connected to the second pin 3222, and the third fusible part 32122 is connected between the fifth conductive part 32121 and the sixth conductive part 32123.

[0066] It is understandable that the second fuse part 32112 and the third fuse part 32122 can fuse when the fusing current is reached, thereby protecting the circuit. By placing the second fuse part 32112 and the third fuse part 32122 in the temperature sampling line 320, it is easier to observe the location of the fuse than to place them in the main sampling line 310, which helps in troubleshooting. At the same time, if any temperature sampling line 320 fuses, the entire temperature sampling line 320 can be replaced, thereby ensuring the functional integrity of the main sampling line 310 and the voltage sampling line 330.

[0067] It should be noted that when replacing the voltage sampling line 330 and the temperature sampling line 320, since the voltage sampling conductor 331 and the temperature sampling conductor 321 are soldered to the main sampling conductor 311, the solder (e.g., solder) at the soldering position can be melted and removed before replacing with new voltage sampling lines 330 and temperature sampling lines 320.

[0068] like Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the battery cell 110 includes an end cap 111, a positive terminal 112, and a negative terminal 113, with both the positive terminal 112 and the negative terminal 113 disposed on the end cap 111; in any two adjacent battery cells 110 in the plurality of battery packs 100, the busbar 200 is electrically connected to the positive terminal 112 of one battery cell 110 and electrically connected to the negative terminal 113 of the other battery cell 110, and the temperature sampling element 322 is connected to the end cap 111.

[0069] For example, the material of the end cap 111 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., without specific limitations.

[0070] For example, the materials of bus 200, positive terminal 112, and negative terminal 113 can be selected from metallic conductive materials (such as copper, aluminum, silver, gold, iron, nickel, etc.) or non-metallic conductive materials (such as carbon-based materials, superconductors, semiconductors, etc.), without specific limitations.

[0071] Understandably, compared to connecting the temperature sampling element 322 to the busbar 200 / positive terminal 112 / negative terminal 113, connecting the temperature sampling element 322 to the end cap 111 allows the temperature sampling element 322 to be closer to the battery cell 110, enabling more accurate acquisition of the actual temperature of the battery cell 110, thus improving sensitivity and accuracy.

[0072] like Figures 2 to 5 As shown, the sampling module 300 further includes a thermally conductive adhesive layer 340, which is located between the end cap 111 and the temperature sampling element 322 along the third direction Z. The thermally conductive adhesive layer 340 is bonded to the end cap 111 and the temperature sampling element 322 respectively.

[0073] For example, the material of the thermally conductive adhesive layer 340 can be silicone thermally conductive adhesive, epoxy thermally conductive adhesive, acrylic thermally conductive adhesive, polyurethane thermally conductive adhesive, etc., and no specific limitation is made here.

[0074] It is understandable that the thermally conductive adhesive layer 340 can fix the temperature sampling element 322 and help to efficiently conduct the heat of the battery cell 110 to the temperature sampling element 322, thereby helping to improve the sensitivity and accuracy of temperature sampling.

[0075] like Figures 1 to 5 As shown, the battery pack 1000 further includes an electrical isolation plate 400, which is disposed between the end cover 111 and the main sampling line 310 along the third direction Z. The battery cell 110 also includes an outer insulating layer 114 covering the end cover 111. The electrical isolation plate 400 is provided with a first clearance hole 410 penetrating along the third direction Z, and the outer insulating layer 114 is provided with a second clearance hole 1141 penetrating along the third direction Z. The first clearance hole 410 and the second clearance hole 1141 are disposed opposite to each other along the third direction Z, and the thermally conductive adhesive layer 340 is respectively disposed through the first clearance hole 410 and the second clearance hole 1141.

[0076] For example, the outer insulation layer 114 may be a polypropylene film, a polyethylene film, a polyvinyl chloride film, a polycarbonate film, etc., without any specific limitation.

[0077] For example, the materials of the first insulator 312, the second insulator 332, the third insulator 323, and the electrical isolation plate 400 can be selected from the following categories: 1. Synthetic organic insulating materials: plastics (e.g., polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc.), synthetic rubbers (e.g., silicone rubber, nitrile rubber, etc.), synthetic fibers (e.g., polyester fiber, nylon, etc.); 2. Natural organic insulating materials: wood, natural rubber, etc.; 3. Inorganic insulating materials: ceramics, glass, mica, quartz, asbestos, etc.; 4. Polymer insulating materials: polycarbonate, polyimide, etc., without specific limitations.

[0078] It is understandable that by setting the electrical isolation plate 400, insulation between the main sampling line 310 and the end cover 111 can be achieved, and the sampling module 300 can also be supported; the outer insulation layer 114 can insulate the end cover 111 from the outside, thereby reducing the risk of short circuit; by setting the first clearance hole 410 and the second clearance hole 1141 respectively, the thermally conductive adhesive layer 340 can be avoided, so that the temperature sampling element 322 can be indirectly connected to the end cover 111 through the thermally conductive adhesive layer 340.

[0079] like Figure 1 , Figure 2 and Figure 6 As shown, in some embodiments, the sampling module 300 further includes a connector 350, with the main sampling conductor 311 connected to the connector 350. The connector 350 is used to connect to the slave control module of the battery management system, thereby realizing the transmission of the sampling signal.

[0080] It should be noted that the battery cell 110 mainly relies on the movement of metal ions between the positive and negative electrode plates to work. The battery cell 110 can be cuboid, cylindrical, flat, or other shapes. According to the packaging method, the battery cell 110 can be a square battery, a cylindrical battery, a pouch battery, etc. According to the type of metal ions, the battery cell 110 can be a lithium-ion battery, a sodium-ion battery, etc.

[0081] Furthermore, according to the physical state of the electrolyte, the battery cell 110 can be a liquid battery, that is, it uses a liquid electrolyte (electrolyte). For example, the battery cell 110 includes a housing and an electrode assembly disposed within the housing. An end cap 111 is connected to the housing on one side along the third direction Z. The electrode assembly can be manufactured using a winding process or a stacking process. The electrode assembly may include an electrode body, a positive electrode tab, and a negative electrode tab. The electrode body is immersed in the liquid electrolyte within the housing and includes a positive electrode plate, a negative electrode plate, and a separator layer. The separator layer is disposed between the positive and negative electrode plates, and the material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode plate includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive electrode tab is connected to the positive current collector and electrically connected to the positive electrode post 112. The negative electrode plate includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative electrode tab is connected to the negative current collector and electrically connected to the negative electrode post 113. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0082] Of course, the battery cell 110 can also be a solid-state battery, that is, it uses a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. Here, we will not make specific restrictions on the type of battery cell 110.

[0083] To address the aforementioned technical problems, embodiments of this application also provide an electrical device, including the battery pack 1000 from any of the above embodiments.

[0084] It is understood that since the power supply device provided in this embodiment has the battery pack 1000 in any of the above embodiments, it has all the beneficial effects of the battery pack 1000, which will not be described in detail here.

[0085] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery pack, characterized in that, It has a first direction (X), a second direction (Y), and a third direction (Z) that are mutually perpendicular to each other, including: Multiple battery packs (100) are arranged along the second direction (Y), and the battery packs (100) include multiple battery cells (110) arranged along the first direction (X). Multiple busbars (200) are electrically connected to any two adjacent battery cells (110) in the multiple battery packs (100); Multiple sampling modules (300) are arranged at intervals along the second direction (Y), with one sampling module (300) corresponding to one battery pack (100). Each sampling module (300) includes a main sampling line (310), a temperature sampling line (320), and multiple voltage sampling lines (330). The main sampling line (310) and the bus (200) are located on the same side of the battery cell (110) along the third direction (Z). The main sampling line (310) includes a main sampling conductor (330). 11) The temperature sampling line (320) includes a temperature sampling conductor (321) and a temperature sampling element (322) connected together. The temperature sampling conductor (321) is welded to the main sampling conductor (311), and the temperature sampling element (322) is connected to the battery cell (110). The voltage sampling line (330) includes a voltage sampling conductor (331), which is welded to the main sampling conductor (311) and electrically connected to the bus (200).

2. The battery pack according to claim 1, characterized in that, The main sampling conductor (311) includes a plurality of main sampling wires (3111) spaced apart along the second direction (Y). The temperature sampling element (322) includes a first pin (3221) and a second pin (3222). The temperature sampling conductor (321) includes a first temperature sampling wire (3211) and a second temperature sampling wire (3212). The first temperature sampling wire (3211) is connected to the first pin (3221), and the second temperature sampling wire (3212) is connected to the second pin (3222). The first temperature sampling wire (3211), the second temperature sampling wire (3212), and the voltage sampling conductor (331) are respectively soldered to different main sampling wires (3111).

3. The battery pack according to claim 2, characterized in that, The main sampling line (310) further includes a first insulator (312) covering the main sampling conductor (311). The first insulator (312) has a first opening (3121), a second opening (3122) and a plurality of third openings (3123). The first temperature sampling wire (3211) is welded to the main sampling wire (3111) exposed in the first opening (3121). The second temperature sampling wire (3212) is welded to the main sampling wire (3111) exposed in the second opening (3122). The voltage sampling conductor (331) of one voltage sampling line (330) corresponds to one of the third openings (3123) and is welded to the main sampling wire (3111) exposed in the third opening (3123).

4. The battery pack according to claim 3, characterized in that, The voltage sampling conductor (331) includes a first conductive part (3311), a first fusible part (3312), and a second conductive part (3313). The first conductive part (3311) is welded to the main sampling wire (3111) exposed in the third opening (3123). The second conductive part (3313) is electrically connected to the bus (200). The first fusible part (3312) is connected between the first conductive part (3311) and the second conductive part (3313).

5. The battery pack according to claim 4, characterized in that, The first conductive part (3311) has a plurality of welding areas (3314) arranged at intervals along the second direction (Y), the welding areas (3314) have a plurality of welding holes (33141) arranged at intervals along the first direction (X), the welding holes (33141) penetrate the first conductive part (3311) along the third direction (Z), and the welding holes (33141) and the main sampling wire (3111) are arranged opposite to each other along the third direction (Z).

6. The battery pack according to claim 2, characterized in that, The first temperature sampling wire (3211) includes a third conductive part (32111), a second fusible part (32112), and a fourth conductive part (32113). The third conductive part (32111) is soldered to the main sampling wire (3111), the fourth conductive part (32113) is connected to the first pin (3221), and the second fusible part (32112) is connected between the third conductive part (32111) and the fourth conductive part (32113). And / or, the second temperature sampling lead (3212) includes a fifth conductive part (32121), a third fusible part (32122) and a sixth conductive part (32123), the fifth conductive part (32121) being soldered to the main sampling lead (3111), the sixth conductive part (32123) being connected to the second pin (3222), and the third fusible part (32122) being connected between the fifth conductive part (32121) and the sixth conductive part (32123).

7. The battery pack according to any one of claims 1 to 6, characterized in that, The battery cell (110) includes an end cap (111), a positive terminal (112), and a negative terminal (113), both of which are disposed on the end cap (111). In any two adjacent battery cells (110) in the plurality of battery packs (100), the busbar (200) is electrically connected to the positive terminal (112) of one of the battery cells (110) and electrically connected to the negative terminal (113) of the other battery cell (110). The temperature sampling element (322) is connected to the end cap (111).

8. The battery pack according to claim 7, characterized in that, The sampling module (300) further includes a thermally conductive adhesive layer (340), which is located between the end cap (111) and the temperature sampling element (322) along the third direction (Z). The thermally conductive adhesive layer (340) is bonded to the end cap (111) and the temperature sampling element (322) respectively.

9. The battery pack according to claim 8, characterized in that, The battery pack also includes an electrical isolation plate (400), which is disposed between the end cap (111) and the main sampling line (310) along the third direction (Z). The battery cell (110) also includes an outer insulating layer (114) covering the end cap (111). The electrical isolation plate (400) is provided with a first clearance hole (410) penetrating along the third direction (Z). The outer insulating layer (114) is provided with a second clearance hole (1141) penetrating along the third direction (Z). The first clearance hole (410) and the second clearance hole (1141) are disposed opposite to each other along the third direction (Z). The thermally conductive adhesive layer (340) is respectively disposed through the first clearance hole (410) and the second clearance hole (1141).

10. An electrical device, characterized in that, The battery pack includes any one of claims 1 to 9.

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