Soft package battery, battery module and vehicle

Abstract

The invention discloses a soft package battery, a battery module and a vehicle. The soft package battery comprises a first battery cell, a second battery cell and a pole assembly, wherein the first battery cell comprises a first main body part and a first tab connected with the first main body part; the second battery cell comprises a second main body part and a second tab connected with the second main body part, and the first battery cell and the second battery cell are arranged at an interval; the pole assembly is partially located between the first battery cell and the second battery cell, the pole assembly comprises a welding pole, and the first tab and the second tab are welded and fixed with the welding pole, so that the first battery cell and the second battery cell are conductively connected. Through the implementation mode, the two battery cells can be welded to form an integral soft package battery, and the tabs of the two battery cells do not need to be stacked and welded, so that the risks of poor welding such as through welding of the tabs and insufficient welding are relieved, and the production efficiency, the production yield and the like are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a soft-pack battery, a battery module and a vehicle. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] As one of many types of batteries, soft-pack batteries can be widely used in electrical devices such as vehicles. Soft-pack batteries can include at least two battery cells, and the pole tabs of at least two battery cells need to be welded and fixed. However, in the existing scheme, the pole tabs of at least two battery cells are mainly folded together and then welded. However, this welding method requires welding through at least two layers of pole tabs, which is prone to problems such as welding through the pole tabs or cold welding. Summary of the invention

[0004] The main purpose of this application is to provide a soft-pack battery, a battery module and a vehicle, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a soft-pack battery, which includes: a first battery cell, a second battery cell and a pole assembly, the first battery cell includes a first main body and a first pole ear connected to the first main body; the second battery cell includes a second main body and a second pole ear connected to the second main body, and the first battery cell and the second battery cell are arranged at intervals; the pole assembly is partially located between the first battery cell and the second battery cell, and the pole assembly includes a welded pole, and the first pole ear and the second pole ear are both welded and fixed to the welded pole to make the first battery cell and the second battery cell conductively connected.

[0006] In some embodiments, the welded pole includes a positive electrode welding pole and a negative electrode welding pole arranged at intervals, the first pole ear includes a first positive pole ear and a first negative pole ear, the second pole ear includes a second positive pole ear and a second negative pole ear, the first positive pole ear and the second positive pole ear are fixed to the positive welding pole, and the first negative pole ear and the second negative pole ear are fixed to the negative welding pole.

[0007] In some embodiments, in the spacing direction between the first battery cell and the second battery cell, the first positive electrode tab and the second positive electrode tab are welded to opposite sides of the positive electrode welding pole, and the first negative electrode tab and the second negative electrode tab are welded to opposite sides of the negative electrode welding pole.

[0008] In some embodiments, at least two welds are formed between the first positive electrode tab and the positive electrode welding pole, and each weld extends in a vertical direction perpendicular to the spacing direction; and / or, at least two welds are formed between the second positive electrode tab and the positive electrode welding pole, and each weld extends in a vertical direction perpendicular to the spacing direction; and / or, at least two welds are formed between the first negative electrode tab and the negative electrode welding pole, and each weld extends in a vertical direction perpendicular to the spacing direction; and / or, at least two welds are formed between the second negative electrode tab and the negative electrode welding pole, and each weld extends in a vertical direction perpendicular to the spacing direction.

[0009] In some embodiments, the negative electrode welding pole includes a lug welding portion and a busbar welding portion, the busbar welding portion and the lug welding portion are fixedly connected, the material of the lug welding portion is at least partially the same as the material of the first negative electrode lug, and is at least partially the same as the material of the second negative electrode lug, the lug welding portion and the first negative electrode lug are welded and fixed to the second negative electrode lug, the material of the busbar welding portion and the material of the lug welding portion are at least partially different, and the busbar welding portion is used to be welded and fixed to a busbar.

[0010] In some embodiments, the pole assembly includes a pole bracket, the positive electrode welding pole and the negative electrode welding pole are fixed to the pole bracket, and the pole bracket is partially connected between the first main body and the second main body.

[0011] In some embodiments, the pole bracket is provided with two spaced apart mounting grooves, the positive electrode welding pole is fixed in one of the mounting grooves, and the negative electrode welding pole is fixed in the other of the mounting grooves.

[0012] In some embodiments, the pole bracket includes two fixing protrusions, the positive electrode welding pole is provided with a first fixing groove, the negative electrode welding pole is provided with a second fixing groove, one of the fixing protrusions is inserted into the first fixing groove, and the other fixing protrusion is inserted into the second fixing groove.

[0013] To solve the above problems, the present application provides a battery module, which includes multiple bus bars and soft-pack batteries as described above, one of the bus bars is fixed to the welding poles of at least two of the soft-pack batteries so that the multiple soft-pack batteries are connected in series and / or in parallel.

[0014] In order to solve the above problems, the present application provides a vehicle, which includes a battery module as described above.

[0015] Compared with the prior art, the soft-pack battery of the present application includes a first battery cell, a second battery cell and a pole assembly, the first battery cell includes a first main body and a first pole ear connected to the first main body; the second battery cell includes a second main body and a second pole ear connected to the second main body, the first battery cell and the second battery cell are arranged at intervals; the pole assembly is partially located between the first battery cell and the second battery cell, the pole assembly includes a welding pole, the first pole ear and the second pole ear are both welded and fixed to the welding pole, so that the first battery cell and the second battery cell are conductively connected. Through the above embodiment, the pole assembly is partially located between the first battery cell and the second battery cell, and the first pole ear and the second pole ear are both welded and fixed to the welding pole, so that the first battery cell and the second battery cell are conductively connected, so that the two battery cells can be welded to form an integral soft-pack battery, and there is no need to stack and weld the pole ears of the two battery cells, which alleviates the risk of welding defects such as welding through the pole ears and cold welding, and improves production efficiency and production yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a first perspective view of an embodiment of a soft-pack battery provided by the present application;

[0018] Figure 2 This is a second viewing angle diagram of an embodiment of a soft-pack battery provided in the present application;

[0019] Figure 3 yes Figure 1 The schematic diagram of the cross-section structure of the soft-pack battery shown along the AA direction;

[0020] Figure 4 yes Figure 1 The schematic diagram of the cross-section structure of the soft-pack battery shown along the BB direction;

[0021] Figure 5 It is a schematic structural diagram of an embodiment of a battery module provided by the present application;

[0022] Figure 6 It is a schematic structural diagram of an embodiment of a vehicle provided by the present application.

[0023] Figure numbers: vehicle 1; battery module 2; controller 3; motor 4; soft-pack battery 10; bus 20; first battery cell 100; first main body 110; first pole ear 120; first negative pole ear 121; first positive pole ear 122; second battery cell 200; second main body 210; second pole ear 220; second negative pole ear 221; second positive pole ear 222; pole assembly 300; welded pole 310; negative electrode welded pole 311; pole ear welding part 3111; bus welding part 3112; second fixing groove 3113; positive electrode welded pole 312; first fixing groove 3121; pole bracket 320; fixing protrusion 321; weld bead 400. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0033] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable. Disposable batteries (Primary Battery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (Secondary Battery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

[0034] The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0035] As one of many types of batteries, soft-pack batteries can be widely used in electrical devices such as vehicles. Soft-pack batteries can include at least two battery cells, and the pole tabs of at least two battery cells need to be welded and fixed. However, in the existing scheme, the pole tabs of at least two battery cells are mainly folded together and then welded. However, this welding method requires welding through at least two layers of pole tabs, which is prone to problems such as welding through the pole tabs or cold welding.

[0036] In order to solve the technical problems existing in the related art, the present application provides a soft pack battery, see Figure 1 and Figure 2 , Figure 1 This is a first perspective view of an embodiment of a soft-pack battery provided by the present application. Figure 2 This is a second viewing angle diagram of an embodiment of the soft-pack battery provided in the present application.

[0037] The soft-pack battery 10 includes a first battery cell 100, a second battery cell 200 and a pole assembly 300. The first battery cell 100 includes a first main body 110 and a first pole ear 120 connected to the first main body 110; the second battery cell 200 includes a second main body 210 and a second pole ear 220 connected to the second main body 210, and the first battery cell 100 and the second battery cell 200 are arranged at an interval; the pole assembly 300 is partially located between the first battery cell 100 and the second battery cell 200, and the pole assembly 300 includes a welding pole 310, and the first pole ear 120 and the second pole ear 220 are both welded and fixed to the welding pole 310 to make the first battery cell 100 and the second battery cell 200 conductively connected.

[0038] The first battery cell 100 and the second battery cell 200 may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, lithium-ion batteries or magnesium-ion batteries, etc. The shapes of the first battery cell 100 and the second battery cell 200 may include but are not limited to cylinders, flat bodies, cuboids or other shapes. The first battery cell 100 and the second battery cell 200 are both soft-pack batteries, which may include a shell, an electrode assembly and an electrolyte, and the shell is used to accommodate the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The material of the separator is not limited, for example, it can be polypropylene or polyethylene. The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. In this embodiment, the positive electrode tab and the negative electrode tab of the first battery cell 100 are collectively referred to as the first tab 120, and the first main body 110 of the first battery cell 100 can be defined as the other part except the first tab 120. The positive electrode tab and the negative electrode tab of the second battery cell 200 are collectively referred to as the second tab 220, and the second main body 210 of the second battery cell 200 can be defined as the other part except the second tab 220.

[0039] In this embodiment, the first battery cell 100 and the second battery cell 200 are arranged at intervals. It can be understood that the first battery cell 100 and the second battery cell 200 both have the largest surface area, and the surface of the first battery cell 100 with the largest surface area and the surface of the second battery cell 200 with the largest surface area are arranged oppositely and at intervals. Specifically, the first main body 110 and the second main body 210 are arranged oppositely and at intervals, and correspondingly, the first pole tab 120 and the second pole tab 220 are arranged oppositely and at intervals. The pole assembly 300 can have a certain thickness and hardness, and the pole assembly 300 can be partially conductive and partially insulated. The pole assembly 300 can be partially located between the first main body 110 and the second main body 210, partially located between the first pole tab 120 and the second pole tab 220, and the rest of the pole tab 120 and the second pole tab 220 protrude outside. The welding pole 310 is at least partially located between the first pole ear 120 and the second pole ear 220. The first pole ear 120 and the second pole ear 220 are both welded and fixed to the welding pole 310. The welding pole 310 is a conductive structure, so that the first pole ear 120 and the second pole ear 220 can be conductively connected, and then the first battery cell 100 and the second battery cell 200 can be conductively connected, so that they can be regarded as a combined battery cell as a whole.

[0040] Through the above-mentioned embodiment, the pole assembly 300 is partially located between the first battery cell 100 and the second battery cell 200, and the first pole ear 120 and the second pole ear 220 are both welded and fixed to the welding pole 310, so that the first battery cell 100 and the second battery cell 200 are conductively connected, and the two battery cells can be welded to form an integral soft-pack battery 10, and there is no need to stack and weld the pole ears of the two battery cells, thereby alleviating the risk of poor welding such as welding through the pole ears and cold welding, and improving production efficiency and production yield, etc.

[0041] Combination Figure 3 and Figure 4 , Figure 3 yes Figure 1 The schematic cross-sectional structure diagram of the soft-pack battery 10 along the AA direction is shown. Figure 4 yes Figure 1 The cross-sectional structure diagram of the soft-pack battery 10 along the BB direction is shown.

[0042] The welding pole 310 includes a positive welding pole 312 and a negative welding pole 311 which are arranged at intervals, the first pole tab 120 includes a first positive pole tab 122 and a first negative pole tab 121, the second pole tab 220 includes a second positive pole tab 222 and a second negative pole tab 221, the first positive pole tab 122 and the second positive pole tab 222 are fixed to the positive welding pole 312, and the first negative pole tab 121 and the second negative pole tab 221 are fixed to the negative welding pole 311.

[0043] The first positive electrode tab 122 and the first negative electrode tab 121 are both connected to the first main body 110, and the first positive electrode tab 122 and the first negative electrode tab 121 are spaced apart. The second positive electrode tab 222 and the second negative electrode tab 221 are both connected to the second main body 210, and the second positive electrode tab 222 and the second negative electrode tab 221 are spaced apart. The first positive electrode tab 122 and the second positive electrode tab 222 can be correspondingly arranged in the spacing direction of the first battery cell 100 and the second battery cell 200, and the first negative electrode tab 121 and the second negative electrode tab 221 can be correspondingly arranged in the spacing direction of the first battery cell 100 and the second battery cell 200. The positive electrode welding pole 312 and the negative electrode welding pole 311 can both be conductive structures, and the positive electrode welding pole 312 and the negative electrode welding pole 311 are insulated from each other. The positive electrode welding pole 312 can be located between the first positive electrode tab 122 and the second positive electrode tab 222, which can facilitate the first positive electrode tab 122 and the second positive electrode tab 222 to be welded and fixed to the positive electrode welding pole 312. The negative electrode welding pole 311 can be located between the first negative electrode tab 121 and the second negative electrode tab 221, which can facilitate the first negative electrode tab 121 and the second negative electrode tab 221 to be welded and fixed to the negative electrode welding pole 311. The positive electrode welding pole 312 can be used as the positive electrode of the soft-pack battery cell, and the negative electrode welding pole 311 can be used as the negative electrode of the soft-pack battery cell, so that the soft-pack battery cell and the bus bar 20 etc. form a current loop.

[0044] Further, in the spacing direction between the first battery cell 100 and the second battery cell 200, the first positive electrode tab 122 and the second positive electrode tab 222 are welded to opposite sides of the positive electrode welding pole 312, and the first negative electrode tab 121 and the second negative electrode tab 221 are welded to opposite sides of the negative electrode welding pole 311. In the spacing direction between the first battery cell 100 and the second battery cell 200, the positive electrode welding pole 312 has two opposite surfaces, one of the first positive electrode tab 122 and the second positive electrode tab 222 is attached to one surface of the positive electrode welding pole 312 and is welded and fixed to the surface, and the other of the first positive electrode tab 122 and the second positive electrode tab 222 is attached to the other surface of the positive electrode welding pole 312 and is welded and fixed to the surface. Similarly, the negative electrode welding pole 311 has two opposite surfaces in the spacing direction between the first battery cell 100 and the second battery cell 200, one of the first negative electrode tab 121 and the second negative electrode tab 221 is fitted with one surface of the negative electrode welding pole 311 and welded to the surface, and the other of the first negative electrode tab 121 and the second negative electrode tab 221 is fitted with the other surface of the negative electrode welding pole 311 and welded to the surface.

[0045] Further, at least two welds 400 are formed between the first positive electrode tab 122 and the positive electrode welding pole 312, and each weld 400 extends in a vertical direction perpendicular to the spacing direction. The spacing direction can be understood as the thickness direction of the first battery cell 100 and / or the second battery cell 200, and the vertical direction can be understood as the width direction of the first battery cell 100 and / or the second battery cell 200. The weld bead 400 can be formed when the first positive electrode tab 122 and the positive electrode welding pole 312 are welded by a welding device, and the weld bead 400 can be linear, and the weld bead 400 can be formed on the side of the first positive electrode tab 122 away from the positive electrode welding pole 312. At least two weld beads 400 can be spaced apart in the height direction of the first battery cell 100 and / or the second battery cell 200, and the number of weld beads 400 can be two, three, four or other numbers. Thus, at least two weld beads 400 are formed between the first positive electrode tab 122 and the positive electrode welding pole 312, which can make the first positive electrode tab 122 and the positive electrode welding pole 312 more stably welded and fixed.

[0046] And / or, at least two welds 400 are formed between the second positive electrode tab 222 and the positive electrode welding pole 312, and each weld 400 extends in a vertical direction perpendicular to the spacing direction. The spacing direction can be understood as the thickness direction of the first battery cell 100 and / or the second battery cell 200, and the vertical direction can be understood as the width direction of the first battery cell 100 and / or the second battery cell 200. The weld bead 400 can be formed when the second positive electrode tab 222 and the positive electrode welding pole 312 are welded by a welding device, and the weld bead 400 can be linear, and the weld bead 400 can be formed on the side of the second positive electrode tab 222 away from the positive electrode welding pole 312. At least two weld beads 400 can be spaced apart in the height direction of the first battery cell 100 and / or the second battery cell 200, and the number of weld beads 400 can be two, three, four or other numbers. Thus, at least two weld beads 400 are formed between the second positive electrode tab 222 and the positive electrode welding pole 312, which can make the second positive electrode tab 222 and the positive electrode welding pole 312 more stably welded and fixed.

[0047] And / or, at least two welds 400 are formed between the first negative electrode tab 121 and the negative electrode welding pole 311, and each weld 400 extends in a vertical direction perpendicular to the spacing direction. The spacing direction can be understood as the thickness direction of the first battery cell 100 and / or the second battery cell 200, and the vertical direction can be understood as the width direction of the first battery cell 100 and / or the second battery cell 200. The weld bead 400 can be formed when the first negative electrode tab 121 and the negative electrode welding pole 311 are welded by a welding device, and the weld bead 400 can be linear, and the weld bead 400 can be formed on the side of the first negative electrode tab 121 away from the negative electrode welding pole 311. At least two weld beads 400 can be spaced apart in the height direction of the first battery cell 100 and / or the second battery cell 200, and the number of weld beads 400 can be two, three, four or other numbers. Thus, at least two weld beads 400 are formed between the first negative electrode tab 121 and the negative electrode welding pole 311, which can make the first negative electrode tab 121 and the negative electrode welding pole 311 more stably welded and fixed.

[0048] And / or, at least two welds 400 are formed between the second negative electrode tab 221 and the negative electrode welding pole 311, and each weld 400 extends in a vertical direction perpendicular to the spacing direction. The spacing direction can be understood as the thickness direction of the first battery cell 100 and / or the second battery cell 200, and the vertical direction can be understood as the width direction of the first battery cell 100 and / or the second battery cell 200. The weld bead 400 can be formed when the second negative electrode tab 221 and the negative electrode welding pole 311 are welded by a welding device, and the weld bead 400 can be linear, and the weld bead 400 can be formed on the side of the second negative electrode tab 221 away from the negative electrode welding pole 311. At least two weld beads 400 can be spaced apart in the height direction of the first battery cell 100 and / or the second battery cell 200, and the number of weld beads 400 can be two, three, four or other numbers. Thus, at least two weld beads 400 are formed between the second negative electrode tab 221 and the negative electrode welding pole 311, which can make the second negative electrode tab 221 and the negative electrode welding pole 311 more stably welded and fixed.

[0049] In some embodiments, the pole assembly 300 includes a pole support 320, and the positive electrode welding pole 312 and the negative electrode welding pole 311 are fixed to the pole support 320, and the pole support 320 is partially connected between the first body part 110 and the second body part 210. The pole support 320 can be an insulator, and the positive electrode welding pole 312 and the negative electrode welding pole 311 can be fixed on the pole support 320 at intervals, so that while the positive electrode welding pole 312 and the negative electrode welding pole 311 are fixed, the positive electrode welding pole 312 and the negative electrode welding pole 311 can also be insulated by the pole support 320. The pole support 320 is partially connected between the first body part 110 and the second body part 210, and the pole support 320 is bonded and fixed to the first body part 110 and / or the second body part 210, so that the pole support 320, the first battery cell 100 and the second battery cell 200 are kept in a relatively fixed state.

[0050] Furthermore, the pole bracket 320 is provided with two spaced mounting grooves, the positive electrode welding pole 312 is fixed in one mounting groove, and the negative electrode welding pole 311 is fixed in the other mounting groove. The two mounting grooves can be spaced in the width direction of the first battery cell 100 and / or the second battery cell 200, and the shapes and sizes of the two mounting grooves can correspond to the positive electrode welding pole 312 and the negative electrode welding pole 311. The negative electrode welding pole 311 is fixed in one mounting groove, and the positive electrode welding pole 312 is fixed in the other mounting groove, and the mounting groove design can facilitate the installation and fixation of the positive electrode welding pole 312 and the negative electrode welding pole 311.

[0051] In some embodiments, the pole support 320 includes two fixing protrusions 321, the positive electrode welding pole 312 is provided with a first fixing groove 3121, the negative electrode welding pole 311 is provided with a second fixing groove 3113, one fixing protrusion 321 is inserted into the first fixing groove 3121, and the other fixing protrusion 321 is inserted into the second fixing groove 3113. The thickness of the fixing protrusion 321 can be less than the thickness of other parts of the pole support 320, the fixing protrusion 321 can be extended along the height direction of the first battery cell 100 and / or the second battery cell 200, and the two fixing protrusions 321 can be spaced apart in the width direction of the first battery cell 100 and / or the second battery cell 200. The positive electrode welding pole 312 can be in a concave shape, and the positive electrode welding pole 312 can be buckled into one fixing protrusion 321 through the first fixing groove 3121, so that the positive electrode welding pole 312 and the pole support 320 are relatively fixed. The negative electrode welding pole 311 may be in a concave structure, and the negative electrode welding pole 311 may be buckled into another fixing protrusion 321 through the second fixing groove 3113 , so that the negative electrode welding pole 311 and the pole bracket 320 are relatively fixed.

[0052] In some embodiments, Figure 3As shown, the negative electrode welding pole 311 includes a pole lug welding portion 3111 and a busbar welding portion 3112, the busbar welding portion 3112 and the pole lug welding portion 3111 are fixedly connected, the material of the pole lug welding portion 3111 is at least partially the same as the material of the first negative pole lug 121, and is at least partially the same as the material of the second negative pole lug 221, the pole lug welding portion 3111 and the first negative pole lug 121 and the second negative pole lug 221 are welded and fixed, the material of the busbar welding portion 3112 is at least partially different from the material of the pole lug welding portion 3111, and the busbar welding portion 3112 is used to be welded and fixed to the busbar 20.

[0053] The pole tab welding portion 3111 may be formed with a second fixing groove 3113, so that the pole tab welding portion 3111 can be fixedly connected through the second fixing groove 3113 and the fixing protrusion 321 on the pole support 320. The busbar welding portion 3112 may be located on the end surface of the pole tab welding portion 3111 away from the first battery cell 100 and / or the second battery cell 200, so that the busbar welding portion 3112 and the busbar 20 are welded and fixed. The material of the tab welding portion 3111 is at least partially the same as the material of the first negative electrode tab 121, and is at least partially the same as the material of the second negative electrode tab 221. For example, the material of the first negative electrode tab 121 and the second negative electrode tab 221 can be mainly copper, and the material of the tab welding portion 3111 can also be copper, which can facilitate the first negative electrode tab 121 and the second negative electrode tab 221 to be more tightly welded and fixed to the tab welding portion 3111, and the welding strength of two objects of the same material is higher, the adaptability is stronger, and the welding yield is higher. Similarly, the material of the busbar welding portion 3112 and the material of the tab welding portion 3111 are at least partially different. The material of the busbar welding portion 3112 can be the same as the material of the busbar 20. Usually, the material of the busbar 20 is aluminum. The material of the busbar welding portion 3112 can be the same as the material of the busbar 20. Both are made of aluminum. When the busbar welding portion 3112 and the busbar 20 are welded and fixed, the welding strength between the busbar welding portion 3112 and the busbar 20 can be higher, the adaptability can be stronger, and the welding yield can be higher.

[0054] To summarize, the pole assembly 300 is partially located between the first battery cell 100 and the second battery cell 200, and the first pole ear 120 and the second pole ear 220 are both welded and fixed to the welding pole 310, so that the first battery cell 100 and the second battery cell 200 are conductively connected, so that the two battery cells can be welded to form an integral soft-pack battery 10, and there is no need to stack and weld the pole ears of the two battery cells, thereby alleviating the risk of poor welding such as welding through the pole ears and cold welding, and improving production efficiency and production yield.

[0055] In order to solve the technical problems existing in the related art, the present application also provides a battery module, see Figure 5 , Figure 5It is a schematic structural diagram of an embodiment of a battery module provided in the present application.

[0056] The battery module 2 includes a plurality of busbars 20 and a plurality of soft-pack batteries 10 of any of the above-mentioned embodiments, and a busbar 20 is fixed to the welding poles 310 of at least two soft-pack batteries 10 so that the plurality of soft-pack batteries 10 are connected in series and / or in parallel. The plurality of soft-pack batteries 10 can be arranged according to a certain rule, and the welding poles 310 of two adjacent soft-pack batteries 10 are arranged correspondingly. The busbar 20 can be welded and fixed to the welding poles 310, so that the plurality of soft-pack batteries 10 are connected in series and / or in parallel. Exemplarily, the plurality of soft-pack batteries 10 can be connected in series, in parallel or in mixed connection, and the mixed connection means that the plurality of soft-pack batteries 10 are both connected in series and in parallel. The plurality of soft-pack batteries 10 can be directly connected in series, in parallel or in mixed connection. Of course, the battery module 2 can also be a battery module in which the plurality of soft-pack batteries 10 are first connected in series, in parallel or in mixed connection, and the plurality of battery modules are then connected in series, in parallel or in mixed connection to form a battery module 2.

[0057] Furthermore, the battery module 2 can be accommodated in a box body, and the box body is used to provide a storage space for the battery module 2. The box body can adopt a variety of structures. In some embodiments, the box body can include a first part and a second part, and the first part and the second part cover each other, and the first part and the second part jointly define a storage space for accommodating the battery module 2. The second part can be a hollow structure with one end open, and the first part can be a plate-like structure, and the first part covers the open side of the second part, so that the first part and the second part jointly define a storage space; the first part and the second part can also be hollow structures with one side open, and the open side of the first part covers the open side of the second part.

[0058] In order to solve the technical problems existing in the related technology, the present application also provides a vehicle, see Figure 6 , Figure 6 It is a schematic structural diagram of an embodiment of a vehicle provided by the present application.

[0059] The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery module 2 is arranged inside the vehicle 1, and the battery module 2 may be arranged at the bottom, head or tail of the vehicle 1. The battery module 2 may be used to power the vehicle 1, for example, the battery module 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery module 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0060] In some other embodiments, the battery module 2 may also be applied to other electrical devices, which may include but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A soft pack battery, characterized in that: The soft pack battery comprises: A first battery cell, comprising a first main body and a first tab connected to the first main body; A second battery cell, comprising a second main body and a second electrode tab connected to the second main body, wherein the first battery cell and the second battery cell are spaced apart from each other; A pole assembly is partially located between the first battery cell and the second battery cell. The pole assembly includes a welding pole. The first pole lug and the second pole lug are both welded and fixed to the welding pole to make the first battery cell and the second battery cell conductively connected.

2. The soft pack battery according to claim 1, characterized in that: The welding pole includes a positive welding pole and a negative welding pole arranged at intervals, the first pole tab includes a first positive pole tab and a first negative pole tab, the second pole tab includes a second positive pole tab and a second negative pole tab, the first positive pole tab and the second positive pole tab are fixed to the positive welding pole, and the first negative pole tab and the second negative pole tab are fixed to the negative welding pole.

3. The soft pack battery according to claim 2, characterized in that: In the spacing direction between the first battery cell and the second battery cell, the first positive electrode tab and the second positive electrode tab are welded to opposite sides of the positive welding pole, and the first negative electrode tab and the second negative electrode tab are welded to opposite sides of the negative welding pole.

4. The soft pack battery according to claim 3, characterized in that: At least two welds are formed between the first positive electrode tab and the positive electrode welding pole, and each weld extends along a vertical direction perpendicular to the spacing direction; And / or, at least two welds are formed between the second positive electrode tab and the positive electrode welding pole, and each weld extends along a vertical direction perpendicular to the spacing direction; And / or, at least two welds are formed between the first negative electrode tab and the negative electrode welding pole, and each weld extends along a vertical direction perpendicular to the spacing direction; And / or, at least two welds are formed between the second negative electrode tab and the negative electrode welding pole, and each weld is extended along a vertical direction perpendicular to the spacing direction.

5. The soft pack battery according to claim 2, characterized in that: The negative electrode welding pole includes a lug welding portion and a busbar welding portion, the busbar welding portion and the lug welding portion are fixedly connected, the material of the lug welding portion is at least partially the same as the material of the first negative electrode lug, and is at least partially the same as the material of the second negative electrode lug, the lug welding portion and the first negative electrode lug are welded and fixed to the second negative electrode lug, the material of the busbar welding portion and the material of the lug welding portion are at least partially different, and the busbar welding portion is used to be welded and fixed to a busbar.

6. The soft pack battery according to claim 2, characterized in that: The pole assembly comprises a pole support, the positive electrode welding pole and the negative electrode welding pole are fixed to the pole support, and the pole support is partially connected between the first main body and the second main body.

7. The soft pack battery according to claim 6, characterized in that: The pole support is provided with two spaced-apart mounting grooves, the positive electrode welding pole is fixed in one of the mounting grooves, and the negative electrode welding pole is fixed in the other of the mounting grooves.

8. The soft pack battery according to claim 6, characterized in that: The pole support includes two fixing protrusions, the positive electrode welding pole is provided with a first fixing groove, the negative electrode welding pole is provided with a second fixing groove, one of the fixing protrusions is inserted into the first fixing groove, and the other fixing protrusion is inserted into the second fixing groove.

9. A battery module, characterized in that: The battery module comprises a plurality of bus bars and a plurality of soft-pack batteries as described in any one of claims 1 to 8, wherein one bus bar is fixed to the welding poles of at least two of the soft-pack batteries so that the plurality of soft-pack batteries are connected in series and / or in parallel.

10. A vehicle, characterized in that: The vehicle includes the battery module according to claim 9.

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