Battery monomer and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery monomer and a battery pack, the battery monomer comprises a shell, a first electrode terminal, an electrode assembly and an adapter; the housing has a first wall. The first electrode terminal is arranged on the first wall; the electrode assembly is arranged in the shell and is provided with a first tab; the adapter is arranged in the shell and comprises a first connecting plate, a bending part and a second connecting plate, the first connecting plate is connected with the first tab, the second connecting plate is connected with the first electrode terminal, an included angle is formed between the first connecting plate and the second connecting plate, and the bending part is connected with the first connecting plate and the second connecting part; wherein the bending part is provided with a first outer edge, a plurality of openings at intervals are formed in the bending part, the minimum distance between the opening closest to the first outer edge and the first outer edge is d1, and d1 is larger than or equal to a1 and smaller than or equal to a2; according to the battery monomer, the reliability of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery monomer and a battery pack. BACKGROUND

[0002] Energy saving and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] During the use of the battery, the reliability of the battery is a problem that cannot be ignored. Therefore, how to improve the reliability of the battery is a technical problem to be solved at present. CONTENT OF THE INVENTION

[0004] The application provides a battery monomer and a battery pack, which improve the reliability of the battery.

[0005] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the application comprises:

[0006] In a first aspect, the application provides a battery monomer, which comprises an outer shell, a first electrode terminal, an electrode assembly and an adapter; the outer shell has a first wall; the first electrode terminal is arranged on the first wall; the electrode assembly is arranged in the outer shell, and the electrode assembly has a first tab; the adapter is arranged in the outer shell, and the adapter comprises a first connecting plate, a bending part and a second connecting plate; the first connecting plate is electrically connected with the first tab; the second connecting plate is electrically connected with the first electrode terminal; the first connecting plate and the second connecting plate have an included angle therebetween; the bending part connects the first connecting plate and the second connecting part; wherein the bending part has a first outer edge, a plurality of spaced openings are arranged on the bending part, the minimum distance between the opening closest to the first outer edge and the first outer edge is d1, and a1≤d1≤a2 is satisfied.

[0007] The battery monomer provided by the embodiments of the present application is provided with a switching piece between the first tab and the first electrode terminal, which can connect the first tab and the first electrode terminal; the switching piece comprises a first connecting plate connected with the first tab and a second connecting plate connected with the first electrode terminal, and the first connecting plate and the second connecting plate are connected through a bending part, so that the force of the first tab on the first connecting plate and the force of the first electrode terminal on the second connecting plate are collected to the bending part; a plurality of openings penetrating the bending part are arranged at intervals between the bending part, which can release the stress of the bending part and ensure the stress balance of the first connecting plate and the second connecting plate on both sides of the bending part; the minimum distance between the opening and the first outer edge of the bending part satisfies 2mm≤d1≤20mm, which improves the overcurrent capacity, reduces the probability of the problem of heat accumulation between the opening and the first outer edge due to insufficient overcurrent capacity, and further forms a fuse, thereby ensuring the overcurrent safety after power-on.

[0008] In a second aspect, the embodiments of the present application provide a battery pack comprising the battery monomer as described in the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0010] Figure 1 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0011] Figure 2 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0012] Figure 3 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0013] Figure 4 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0014] Figure 5 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure;

[0015] Figure 6 The structural schematic diagram of the battery monomer provided by some embodiments of the present application is shown in the figure.

[0016] Among them:

[0017] 1: outer shell; 101: first wall;

[0018] 2: first electrode terminal;

[0019] 3: electrode assembly; 301: first tab;

[0020] 4: adapter; 401: first connecting plate; 402: bending part; 403: second connecting plate;

[0021] 4011: first solder print;

[0022] 4021: first outer edge; 4022: opening;

[0023] 4031: second solder print;

[0024] X: first direction. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0027] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0028] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0029] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0030] "Multiple" appearing in this application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0031] As an example, the battery monomer includes a battery cell formed by taking a positive electrode sheet and a negative electrode sheet as an electrochemical material carrier, preventing short circuit by isolating the positive and negative electrode sheets by a separator, taking an electrolyte as an ion transmission carrier, achieving structural protection by a shell, and connecting with an external circuit through a terminal.

[0032] As an example, the battery cell includes at least one of a square battery cell with a metal shell, a plastic shell battery, a soft package battery cell, or a cylindrical battery cell.

[0033] In some embodiments, the positive electrode sheet includes a positive electrode current collector having a plurality of surfaces, at least one of which is provided with a positive electrode active material.

[0034] As an example, the positive electrode active material is located on the surface of the positive electrode current collector along the thickness direction of the positive electrode current collector.

[0035] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. When the positive electrode current collector includes a metal foil, at least one of surface silver-plated aluminum, surface silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. When the positive electrode current collector includes a composite current collector, the composite current collector can include a high polymer material base layer and a metal layer, and the composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0036] As an example, the positive electrode active material includes, but is not limited to, the following materials: lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0037] In some embodiments, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material. The negative electrode current collector includes a metal foil or a composite current collector can be used. When the negative electrode current collector includes a metal foil, surface silver-plated aluminum, surface silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, at least one of carbon, nickel, or titanium can be used.

[0038] As an example, the negative electrode active material is disposed on the surface of the negative electrode current collector along the thickness direction thereof.

[0039] As an example, the negative electrode active material includes, but is not limited to, the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, and other conventional materials that can be used as a battery negative electrode active material known in the art can also be used. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys, but the present application is not limited to these materials. These negative electrode active materials can be used alone or in combination with two or more.

[0040] In some embodiments, the separator includes a separator film, which can be selected from any known porous structure separator film having good chemical stability and mechanical stability.

[0041] As an example, the main material of the separator film includes at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of each layer can be the same or different, and is not particularly limited. The separator member can be a single member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0042] In some embodiments, the separator includes a solid-state electrolyte. The solid-state electrolyte is located between the positive electrode sheet and the negative electrode sheet, and functions to transport ions and separate the positive and negative electrodes.

[0043] In some embodiments, the positive electrode sheet, the negative electrode sheet, and the separator form a roll structure.

[0044] In some embodiments, the positive electrode sheet, the negative electrode sheet, and the separator form a stack structure.

[0045] In some embodiments, the shell comprises at least one of a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. The shell can encapsulate the positive electrode sheet, the negative electrode sheet, the separator, and the like.

[0046] In some embodiments, the shell comprises an end cover and a shell body, the shell body is provided with an opening, and the end cover closes the opening to form a sealed space for accommodating the electrode assembly, the electrolyte, and the like. The shell body can be provided with one or more openings. The end cover can also be provided with one or more openings.

[0047] In some embodiments, at least one electrode terminal is provided on the shell, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal is connected to the tab through an adapter. The electrode terminal can be provided on the end cover or on the shell body.

[0048] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes, the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, and the like, and the embodiments of the present application are not particularly limited.

[0049] The development of battery technology needs to consider various design factors, such as energy density, discharge capacity, charge-discharge rate, overcurrent capacity, and other performance parameters. The overcurrent capacity of the battery refers to the maximum current that the battery can withstand during operation. Generally, the stronger the overcurrent capacity of the battery, the greater the current that the battery can provide, thereby meeting the use requirements of higher-power devices. The overcurrent capacity of the battery is affected by various factors, such as battery type, battery mass, battery temperature, and the like. Generally, a battery with strong overcurrent capacity can provide a larger current output and is suitable for use in higher-power devices. The overcurrent capacity of the battery also has an important impact on the safety of the battery. If the overcurrent capacity of the battery is insufficient, when the current exceeds the range that the battery can withstand, excessive heat will be generated inside the battery, and even a fire or other safety accidents can be triggered.

[0050] In order to increase the overcurrent of the battery, the adapter for connecting the pole and the tab is widened, and the adapter is welded on both sides of the pole and the tab. However, due to the difference in material between the two sides, the welding imprint compaction degree and the welding imprint shape are usually different. When the adapter is bent, the stress on both sides of the bending section is uneven, which can easily cause the bending section to deform. Therefore, an opening needs to be provided on the bending portion to release the stress of the bending portion. However, if the opening is too close to the outer edge of the bending portion, the overcurrent capacity of the part between the opening and the outer edge of the bending portion will be poor, resulting in heat accumulation and even melting.

[0051] In view of this, in order to improve the reliability of the battery, the present application provides a battery cell, which will be described below with reference to Figure 1 andFigure 2 The battery monomer comprises a shell 1, a first electrode terminal 2, an electrode assembly 3 and an adapter 4.

[0052] The shell 1 can be a conductive member or an insulating member, and the shell 1 can provide structural protection for the electrode assembly 3. The shell 1 is provided with a first wall 101. It can be understood that the first wall 101 can be a cover plate of the battery monomer.

[0053] The first wall 101 is provided with the first electrode terminal 2, which can be a positive electrode terminal or a negative electrode terminal.

[0054] The shell 1 is provided with the electrode assembly 3, which comprises a first tab 301 that can be electrically connected to the first electrode terminal 2. The shell 1 can provide structural protection for the electrode assembly 3.

[0055] It should be noted that the first tab 301 can be a positive electrode tab or a negative electrode tab, which is not limited in the present application.

[0056] As an example, the electrode assembly 3 is formed by stacking or winding a positive plate, a negative plate and a separator, the separator is arranged between the positive plate and the negative plate, the separator can provide electronic insulation, and the positive plate and the negative plate are ionically conductive through an electrolyte.

[0057] The shell 1 is further provided with the adapter 4, which is located between the first tab 301 and the first electrode terminal 2, and the adapter 4 can electrically connect the first tab 301 and the first electrode terminal 2.

[0058] The adapter 4 comprises a first connecting plate 401, a bending portion 402 and a second connecting plate 403. The first connecting plate 401 is electrically connected to the first tab 301, and the second connecting plate 403 is electrically connected to the first electrode terminal 2. The first connecting plate 401 can be welded and fixed to the first tab 301, and the second connecting plate 403 can be welded and fixed to the first electrode terminal 2. Alternatively, the first connecting plate 401, the bending portion 402 and the second connecting plate 403 can be an integral molded member. Thus, the production efficiency of the connecting member can be improved, and the production cost of the connecting member can be reduced.

[0059] The first connecting plate 401 and the second connecting plate 403 are connected through the bending portion 402, and the first connecting plate 401 and the second connecting plate 403 have an included angle therebetween. The first connecting plate 401 and the second connecting plate 403 are arranged at an included angle, which can reduce the space occupation of the connecting member in the thickness direction of the first wall 101 inside the shell 1.

[0060] As Figure 3As shown, a plurality of openings 4022 are arranged at intervals on the bending portion 402, and the first connecting plate 401 and the second connecting plate 403 are arranged at an angle, which causes stress on the bending portion 402. The openings 4022 can release part of the stress. The bending portion 402 is provided with a first outer edge 4021. Please refer to Figure 4 The minimum distance between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 is d1, which satisfies 2mm≤d1≤20mm. The first outer edge 4021 is connected to the same side of the first connecting plate 401 and the second connecting plate 403.

[0061] Optionally, the minimum distance can be 2mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, or 20mm.

[0062] Since the minimum distance between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 satisfies the above range, on the one hand, the overcurrent capacity of the part between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 of the bending portion 402 is guaranteed, and the probability of safety problems such as melting is reduced. On the other hand, the stress of the part between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 of the bending portion 402 is fully released.

[0063] Since the minimum distance between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 satisfies the above range, the distance between the remaining openings 4022 and the first outer edge 4021 is greater than 2, so that the part between the opening 4022 and the first outer edge 4021 on the bending portion 402 simultaneously considers the overcurrent capacity and the stress release capacity.

[0064] The battery cell provided in the embodiments of the present application is provided with a switching piece 4 between the first tab 301 and the first electrode terminal 2, which can connect the first tab 301 and the first electrode terminal 2. The switching piece 4 includes a first connecting plate 401 connected to the first tab 301 and a second connecting plate 403 connected to the first electrode terminal 2. The first connecting plate 401 and the second connecting plate 403 are connected through a bending portion 402. The bending portion 402 is provided with a plurality of openings 4022 penetrating the bending portion 402. The openings 4022 can release the stress of the bending portion 402. The minimum distance between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 of the bending portion 402 satisfies 2mm≤d1≤20mm. The part between the opening 4022 and the first outer edge 4021 on the bending portion 402 simultaneously considers the overcurrent capacity and the stress release capacity.

[0065] In other embodiments, a plurality of openings 4022 are arranged at intervals along the first direction X, and each of the openings 4022 can serve to relieve stress in the bent portion 402, with current flowing through the plurality of openings 4022. Any one of the openings 4022 is positioned opposite to the first outer edge 4021 in the first direction X.

[0066] In other words, this solution provides stress-relieving openings 4022 at multiple locations in the bending portion 402, ensuring stress balance on both sides of the bending portion 402.

[0067] In other embodiments, such as Figure 4 As shown, the minimum distance between any two adjacent openings 4022 is d2, and the dimension of the bent part 402 in the first direction X is L1, 10mm≤L1≤60mm, satisfying: 0.03≤d2 / L1≤1.8.

[0068] It is understandable that the flow capacity of the portion between any two openings 4022 of the bend 402 is affected by the distance between the two openings 4022. At the same time, the distance between the two openings 4022 affects the stress relief effect of the openings 4022. Since the ratio of the minimum distance between any two adjacent openings 4022 to the dimension of the bend 402 in the first direction X satisfies the above range, on the one hand, the flow capacity of the portion between any two openings 4022 of the bend 402 is guaranteed, and the probability of melting of the portion between any two openings 4022 of the bend 402 is reduced; on the other hand, it can also ensure that the stress in the bend 402 can be released.

[0069] Optionally, the dimension L1 of the bent portion 402 in the first direction X can be 10mm, 20mm, 30mm, 40mm, 50mm, or 60mm.

[0070] Optionally, d2 / L1 can be selected as 0.03, 0.13, 0.33, 0.53, 0.73, 0.93, 1.13, 1.33, 1.53, 1.73, or 1.8.

[0071] In other embodiments, d2 satisfies: 2mm ≤ d2 ≤ 18mm. On the one hand, this ensures the current-carrying effect of the portion of the bend 402 between any two openings 4022 when current flows through any two openings 4022, thus guaranteeing the overall current-carrying capacity of the bend 402. On the other hand, it ensures that the number of openings 4022 in the bend 402 meets the stress balance requirements on both sides of the bend 402.

[0072] Optionally, the minimum distance d2 can be selected as 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, or 18mm.

[0073] In other embodiments, the number of multiple openings 4022 is N, where 1 ≤ N ≤ 5, and the dimension of the bend 402 in the first direction X is L1, satisfying: 0.015 ≤ N / L1 ≤ 0.5. Since the ratio of the number of openings 4022 to the number of bends 402 in the first direction X satisfies the above range, on the one hand, the overall flow capacity of the bend 402 is guaranteed, reducing the probability of the bend 402 melting; on the other hand, it can also ensure that the stress in the bend 402 can be released.

[0074] Optionally, the number N of multiple openings 4022 can be selected as 1, 2, 3, 4, or 5.

[0075] Optionally, the ratio of the number of multiple openings 4022 to the size of the bend 402 in the first direction X can be 0.015, 0.055, 0.115, 0.165, 0.215, 0.265, 0.315, 0.365, 0.415, 0.465, or 0.5.

[0076] In other embodiments, such as Figure 5 As shown, a first weld mark 4011 is provided on the first connecting plate 401, which is connected to the first electrode tab 301. The first connecting plate 401 is connected to the first electrode tab 301 through the first weld mark 4011. A second weld mark 4031 is provided on the second connecting part. It can be understood that the pressure, depth, and shape of the weld mark affect the magnitude and direction of the stress generated. Along the length of the adapter 4, multiple openings 4022 are provided between the first weld mark 4011 and the second weld mark 4031. Since the stress is mainly concentrated between the first weld mark 4011 and the second weld mark 4031 during the welding process, providing multiple openings 4022 between the first weld mark 4011 and the second weld mark 4031 can release the generated stress to the greatest extent.

[0077] In other words, along the length of the adapter 4, an opening 4022 is provided between the first solder mark 4011 and the second solder mark 4031. This opening 4022 can release the different stresses generated by the first solder mark 4011 and the second solder mark 4031 to ensure stress balance on both sides of the bent part 402.

[0078] In other embodiments, along the length of the adapter 4, the minimum distance between the plurality of openings 4022 and the first solder mark 4011 is greater than the minimum distance between the plurality of openings 4022 and the second solder mark 4031.

[0079] The first welding mark 4011 is used for welding the tab, and the tab is thick, so the welding depth is relatively deep, so that the edge of the first connecting plate 401 after welding is thinned. The second welding mark 4031 is used for welding the first electrode terminal 2, and the welding depth is relatively shallow, so that the edge thickness of the second connecting plate 403 after welding is greater than that of the first connecting plate 401, so that the minimum distance between the opening 4022 and the first welding mark 4011 is greater than that between the opening 4022 and the second welding mark 4031, so that even if the edge of the first connecting plate 401 is thin, the overcurrent capacity of the part between the opening 4022 of the first connecting plate 401 and the first welding mark 4011 can be guaranteed, and the probability of melting is reduced.

[0080] In other embodiments, please refer to Figure 6 The minimum distance between the plurality of openings 4022 and the first welding mark 4011 is d3, which satisfies: 1mm≤d3≤30mm.

[0081] Optionally, the minimum distance d3 between the opening 4022 and the first welding mark 4011 can be 1mm, 3mm, 4mm, 7mm, 11mm, 15mm, 18mm, 21mm, 24mm, 27mm, 30mm.

[0082] The first welding mark 4011 is used for welding the tab, and the tab is thick, so the welding depth is relatively deep, so that the edge of the first connecting plate 401 after welding is thinned. The second welding mark 4031 is used for welding the first electrode terminal 2, and the welding depth is relatively shallow, so that the edge thickness of the second connecting plate 403 after welding is greater than that of the first connecting plate 401, so that the minimum distance between the opening 4022 and the first welding mark 4011 is greater than that between the opening 4022 and the second welding mark 4031, so that even if the edge of the first connecting plate 401 is thin, the overcurrent capacity of the part between the opening 4022 of the first connecting plate 401 and the first welding mark 4011 can be guaranteed, and the probability of melting is reduced.

[0083] In other embodiments, the melting temperature of the adapter 4 is not less than z℃, which satisfies: 500℃≤z≤1200℃. Since the melting temperature of the adapter 4 is not less than z℃, the adapter 4 has strong resistance to high temperature.

[0084] Therefore, the minimum distance between the opening 4022 closest to the first outer edge 4021 and the first outer edge 4021 satisfies the above range, which can guarantee the overcurrent capacity of the part between the opening 4022 closest to the first outer edge 4021 of the bending part 402 and the first outer edge 4021, and reduce the probability of safety problems such as melting, and on the other hand, the stress of the part between the opening 4022 closest to the first outer edge 4021 of the bending part 402 and the first outer edge 4021 can be fully released.

[0085] Optionally, the melting temperature of the adapter can be 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, 1100℃, 1200℃.

[0086] As an example, all the distances in the present application are measured on the surface of the component.

[0087] In some embodiments, the battery pack includes the battery cell of any of the embodiments. Since the battery pack of the present application includes the battery cell of the above embodiments, the reliability of the battery pack is improved.

[0088] In the above scheme, the battery cell can be one or several, and when the battery cell is multiple, the multiple battery cells are arranged and fixed to form a battery module.

[0089] The battery pack includes a box body and a battery cell, and the battery cell is accommodated in the box body.

[0090] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0091] In some embodiments, the electrode assembly includes a jelly-roll type electrode assembly. The jelly-roll type electrode assembly includes a positive electrode, a negative electrode, and a separator sandwiched therebetween, and the positive electrode, the negative electrode, and the separator are wound to form an electrode assembly.

[0092] In some embodiments, the electrode assembly includes a stacked type electrode assembly. The stacked type electrode assembly includes a positive electrode, a negative electrode, and a separator, and the positive electrode, the negative electrode, and the separator are stacked in a certain stacking order to form an electrode assembly.

[0093] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft. A power supply system of the electric device can be composed of the battery cell and the battery disclosed in the present application.

[0094] The embodiments of the present application provide an electric device using the battery cell as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric vehicle, a ship, a spacecraft, and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0095] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0096] The vehicle includes one of a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile includes, but is not limited to, a pure electric automobile, a hybrid automobile, or a range extended automobile. The vehicle is provided with a battery at a bottom, a head, or a tail of the vehicle. The battery supplies power for the vehicle. The battery serves as an operating power supply for the vehicle and supplies power for a circuit system of the vehicle, including meeting the working power demand of the vehicle during starting, navigation, and running.

[0097] The vehicle further includes a controller and a motor. The controller is configured to control the battery to supply power for the motor, including meeting the working power demand of the vehicle during starting, navigation, and running.

[0098] In some embodiments of the present application, the battery can not only serve as an operating power supply for the vehicle, but also serve as a driving power supply for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0099] The battery includes a box body and battery cells accommodated in the box body. The box body can adopt various structures. In some embodiments, the box body includes a first sub-box body and a second sub-box body. The first sub-box body and the second sub-box body are combined to form the box body. The first sub-box body and the second sub-box body jointly define an accommodation space for accommodating the battery cells. The second sub-box body includes a square structure with one side open. The first sub-box body includes a square structure with one side open. The openings of the first sub-box body and the second sub-box body are correspondingly combined to jointly define the accommodation space with the first sub-box body and the second sub-box body. The first sub-box body includes a plate-shaped structure. The opening side of the first sub-box body is covered by the second sub-box body.

[0100] In the battery, the battery cells include a plurality of battery cells. The plurality of battery cells can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells are connected in series and in parallel. The plurality of battery cells can be directly connected in series, in parallel, or in a mixed connection. The plurality of battery cells are accommodated in the box body as a whole. Of course, the battery can also be in the form of a plurality of battery cells connected in series, in parallel, or in a mixed connection to form a battery module. A plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body. The battery can further include other structures. For example, the battery can further include a busbar component for realizing electrical connection between the plurality of battery cells.

[0101] The battery cell includes at least one of a secondary battery or a primary battery. The battery cell includes, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery.

[0102] It should also be noted that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. In the context of the specification, the term "and / or" means "and" or "or", and the term "or" means "and" or "or". In the context of the specification, the term "exemplary" means "example" or "an example of".

[0103] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0104] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

[0105] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a housing having a first wall; a first electrode terminal disposed on the first wall; an electrode assembly disposed in the housing, the electrode assembly having a first tab; an adapter disposed in the housing, the adapter comprising a first connecting plate, a bent portion, and a second connecting plate, the first connecting plate being electrically connected to the first tab, the second connecting plate being electrically connected to the first electrode terminal, the first connecting plate and the second connecting plate having an included angle therebetween, the bent portion connecting the first connecting plate and the second connecting plate; wherein the bent portion has a first outer edge, a plurality of spaced openings are disposed on the bent portion, a minimum distance between an opening closest to the first outer edge and the first outer edge is d1, and 2mm≤d1≤20mm is satisfied.

2. The battery cell of claim 1, wherein, The plurality of openings are spaced apart in a first direction, and any one of the openings is oppositely disposed to the first outer edge in the first direction.

3. The battery cell of claim 2, wherein, A minimum distance between any two adjacent openings is d2, a size of the bent portion in the first direction is L1, 10mm≤L1≤60mm is satisfied, and 0.03≤d2 / L1≤1.8 is satisfied.

4. The battery cell of claim 3, wherein, The d2 satisfies 2mm≤d2≤18mm.

5. The battery cell of claim 2, wherein, A number of the plurality of openings is N, 1≤N≤5 is satisfied, and 0.015≤N / L1≤0.5 is satisfied.

6. The battery cell of claim 1, wherein, The first connecting plate is provided with a first welding mark, the second connecting plate is provided with a second welding mark, and along a length direction of the adapter, the plurality of openings are disposed between the first welding mark and the second welding mark.

7. The battery cell of claim 6, wherein, Along the length direction of the adapter, a minimum distance between the plurality of openings and the first welding mark is greater than a minimum distance between the plurality of openings and the second welding mark.

8. The battery cell of claim 7, wherein, A minimum distance between the plurality of openings and the first welding mark is d3, and 1mm≤d3≤30mm is satisfied.

9. The battery cell of claim 1, wherein, A melting temperature of the adapter is not less than z℃, and 500℃≤z≤1200℃ is satisfied.

10. A battery pack characterized by comprising: The battery cell comprises any one of claims 1-9.

Images