Battery cell

Abstract

The utility model discloses a battery monomer, and relates to the technical field of batteries, the battery monomer comprises a shell, an inner core, a cover plate, a pole and an insulating sheet, the inner core is arranged in the shell; the cover plate is arranged at the opening of the shell; the pole is arranged on the cover plate; the insulating sheet is arranged in the shell; wherein the end part of the inner core is provided with a pole lug, and the pole lug penetrates through the insulating sheet and is connected with the pole column on the cover plate; and at least part of the tab is made of a fusible material. After the inner core is short-circuited, a large amount of heat is generated in the overcurrent area of the tab, and the tab is fused; and after the tab is fused, the insulating sheet is clamped between the tab and the cover plate, so that the tab is effectively prevented from being overlapped again after being fused, and the safety is improved.

Description

TECHNICAL FIELD

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

[0002] For large-capacity inner cores, safety is particularly important, especially in the case of short circuit and thermal runaway of the inner core, a large amount of gas is rapidly generated inside the inner core, and if the inner core cannot be timely relieved, safety problems such as explosion may occur. The related technology generally welds a fuse device for timely cutting off the current in the case of short circuit to achieve safety protection, but such safety protection measures have the problems of high cost and many parts. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide a battery monomer, which aims to achieve safety protection in the case of short circuit and reduce cost and the number of parts used.

[0004] To achieve the above purpose, the present application provides a battery monomer, which comprises:

[0005] a shell;

[0006] an inner core arranged in the shell;

[0007] a cover plate arranged at an open end of the shell;

[0008] a pole arranged on the cover plate;

[0009] an insulating sheet arranged in the shell;

[0010] wherein an end portion of the inner core has a tab, the tab penetrates the insulating sheet and is connected with the pole on the cover plate, and at least part of the tab is made of a fusible material.

[0011] In an embodiment, the insulating sheet is provided with a hole, and the tab penetrates the hole and is connected with the pole.

[0012] Alternatively, the insulating sheet is provided with a slit, and the tab penetrates the slit and is connected with the pole.

[0013] In an embodiment, the number of the inner cores is two, which are a first inner core and a second inner core, the tab of the first inner core is a first tab, the tab of the second inner core is a second tab, the first inner core and the second inner core are arranged in close contact with each other, and the first tab and the second tab are arranged in opposite intervals.

[0014] At least one of the first tab and the second tab is provided with a through hole connected with the insulating sheet.

[0015] In an embodiment, the first lug, the second lug, the first inner core and the second inner core enclose a mounting groove; the insulating sheet is clamped between the lugs and the cover plate through the mounting groove.

[0016] In an embodiment, the pole column comprises a positive pole column and a negative pole column spaced on the cover plate, the first lug comprises a first positive lug and a first negative lug spaced; the second lug comprises a second positive lug and a second negative lug spaced.

[0017] The first positive lug and the second positive lug are oppositely spaced; the first negative lug and the second negative lug are oppositely spaced.

[0018] The first positive lug and the second positive lug are oppositely spaced; the first negative lug and the second negative lug are oppositely spaced.

[0019] In an embodiment, the first lug and the second lug each have a first connecting portion and a second connecting portion connected as a whole.

[0020] The first connecting portion is arranged at the first end of the inner core, and the second connecting portion penetrates the insulating sheet and is connected with the pole column.

[0021] In an embodiment, the thickness of the insulating sheet is between 0.03mm and 1.0mm.

[0022] In an embodiment, the fusible material is at least one of aluminum, zinc and aluminum alloy.

[0023] In an embodiment, the shell is hollow inside, and at least one end of the shell has the opening.

[0024] In an embodiment, the shell and the cover plate arranged at the opening of the shell enclose a sealed structure for accommodating the inner core.

[0025] The lug at the end of the inner core penetrates the insulating sheet and is connected with the pole column on the cover plate, which not only realizes the electrical connection between the inner core and the external circuit, but also maintains the electrical isolation between the inner core and the outside by means of the insulating sheet, effectively optimizing the safety and reliability of the battery monomer.

[0026] At least part of the lug is made of fusible material, after the inner core is short-circuited, the lug generates a large amount of heat in the overcurrent area, the lug is fused, after the lug is fused, the insulating sheet is clamped between the lug and the cover plate, which can prevent the short-circuited lug from being in contact again and causing secondary short circuit, further enhancing the safety performance of the inner core.

[0027] The overall structure is simple and easy to realize, effectively reduces the use of additional parts, reduces the occupation of space, and reduces the production cost. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the structure of a single battery cell provided in this application;

[0030] Figure 2 An exploded view of one embodiment of the battery cell provided in this application;

[0031] Figure 3 A schematic diagram of the structure of one embodiment of the cover plate provided in this application;

[0032] Figure 4 A schematic diagram of the structure of one embodiment of the inner core provided in this application;

[0033] Figure 5 for Figure 4 A magnified view of point A;

[0034] Figure 6 A partial structural schematic diagram of an embodiment of the present application in which the inner core is provided with an insulating sheet;

[0035] Figure 7 for Figure 6 A magnified view of point B;

[0036] Figure 8 An exploded view of a partial structure of an embodiment of an embodiment provided in this application, wherein the core has an insulating sheet;

[0037] Figure 9 for Figure 8 Enlarged view of point C.

[0038] Explanation of icon numbers:

[0039] 100. Shell;

[0040] 200, Inner core; 201, First end; 202, Second end; 211, First inner core; 212, Second inner core; 220, Electrode tab; 2201, First connecting part; 2202, Second connecting part; 2203, Mounting groove; 221, First electrode tab; 2211, First positive electrode tab; 2212, First negative electrode tab; 222, Second electrode tab; 2221, Second positive electrode tab; 2222, Second negative electrode tab; 230, Through hole;

[0041] 300, cover plate; 310, liquid injection hole;

[0042] 400, pole; 410, positive pole; 420, negative pole;

[0043] 500, insulating sheet; 510, hole.

[0044] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part 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 of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0046] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0047] In addition, if the embodiments of the present application involve descriptions such as “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes include A scheme, or B scheme, or A and B schemes are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those of ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0048] For large capacity inner core, safety is particularly important, especially in the case of short circuit, thermal runaway, the inner core inside the rapid generation of a large amount of gas, if the inner core can not be timely pressure relief, may occur explosion and other safety problems. The related art generally by welding another fuse device, for timely cutting off the current in the case of short circuit, specifically, will be in the inner core welding connecting piece, and set the fuse device on the connecting piece, in order to realize the safety protection. However, the fuse device is set on the connecting piece, there is high cost, need to set additional parts, the problem of many parts, and the connecting piece as the intermediate flow of parts, and the terminal welding, further increase the inner resistance of the inner core, lead to the increase of the inner core heat, affect the energy efficiency of the inner core.

[0049] Reference Figures 1 to 9 The application provides a battery monomer for timely cutting off the current in the case of short circuit, while realizing safety protection, reducing cost and reducing the use of additional parts.

[0050] The battery monomer of the application comprises a shell 100, an inner core 200, a cover plate 300, a pole 400 and an insulating sheet 500. The battery monomer can be but is not limited to a blade battery (a kind of lithium iron phosphate battery) or any other type of battery. The inner core 200 can be a roll core or any other form of inner core. The insulating sheet 500 mainly serves as an insulating and isolating function and is made of plastic film, composite material or other materials such as nylon and silicone rubber with insulating function.

[0051] The inner core 200 is arranged in the shell 100; the cover plate 300 is arranged at the open end of the shell 100; and the pole 400 is arranged on the cover plate 300.

[0052] The insulating sheet 500 is arranged in the shell 100. The end of the inner core 200 has a tab 220, which penetrates the insulating sheet 500 and is connected to the pole 400 on the cover plate 300. At least part of the tab 220 is made of a fusible material.

[0053] Taking a lithium battery as an example, the lithium battery mainly comprises a positive electrode and a negative electrode. The positive electrode part comprises but is not limited to a positive electrode current collector and a positive electrode active material coated on the surface of the positive electrode current collector. The material of the positive electrode current collector is usually selected from metals such as aluminum with good electrical conductivity; the positive electrode tab can be arranged as a protruding part of the positive electrode current collector, an extension part of the edge of the positive electrode current collector or a separately arranged metal sheet, etc., for welding or connecting with the external circuit. The negative electrode part also comprises but is not limited to a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector. The material of the negative electrode current collector is usually selected from metals such as copper with good electrical conductivity and mechanical properties; the negative electrode tab can be arranged as a protruding part of the negative electrode current collector, an extension part of the edge of the negative electrode current collector or a separately arranged metal sheet, etc., for welding or connecting with the external circuit.

[0054] The shell 100 and the cover plate 300 arranged at the opening of the shell 100 form a sealed structure for accommodating the inner core 200. The inner core 200 is mounted in the shell 100 through the opening of the shell 100, and the cover plate 300 is arranged at the opening of the shell 100, for protecting the inner core 200 inside the battery monomer and other structures of the battery monomer, avoiding the influence of the external environment on the inside of the battery monomer, and realizing the sealing and electrical safety of the battery monomer.

[0055] The insulating sheet 500 can avoid the direct contact between the inner core 200 and the pole 400 and the external conductor, and prevent short circuit and electric shock danger. The tab 220 penetrates the insulating sheet 500 and is connected with the pole 400, which not only realizes the electrical connection between the inner core 200 and the external circuit, but also maintains the electrical isolation between the inner core 200 and the outside by means of the insulating sheet 500, effectively optimizing the safety and reliability of the battery monomer. Part of the tab 220 is made of a fusible material. After the inner core 200 is short-circuited, the overcurrent area of the tab 220 generates a large amount of heat, and the tab 220 is fused. After the tab 220 is fused, the insulating sheet 500 is clamped between the tab 220 and the cover plate 300, effectively preventing the tab 220 from re-lapping after being fused and causing safety problems. The overcurrent area is an area where the current mainly passes through.

[0056] The fusible material refers to a material that can be fused due to heat when the current exceeds a certain value. Such a material usually has the characteristics of low melting point, high electrical conductivity and easy processing. At least part of the tab 220 is made of a fusible material as a safety protection measure. When an abnormality (such as short circuit or overheating) occurs inside the battery monomer, the tab 220 can quickly fuse and cut off the circuit to prevent the battery from exploding or catching fire. The insulating sheet 500 can also prevent the tab 220 from being short-circuited again due to re-lapping and other reasons after being fused, further enhancing the safety performance of the inner core 200.

[0057] In the embodiments of the present application, the fusible material can be selected from at least one of aluminum, zinc and aluminum alloy. In the implementation, the suitable fusible material needs to be selected considering the battery design, manufacturing and electrolytic reaction environment, and the present application mainly takes aluminum as an example to illustrate the fusible material.

[0058] Compared with the method of needing to additionally set a connecting piece and weld a fuse device thereon, the embodiment does not need to additionally set an extra part, cancels the connecting piece, reduces the welding process for setting the connecting piece, and avoids the problems of a large number of parts and the influence of the energy efficiency of the inner core due to the additional setting of the part caused by the need to increase the fuse device on the connecting piece. By adopting the structure of at least part of the tab 220 being made of a fusible material and the insulating sheet 500, the electrical isolation and electrical connection inside the battery monomer can be more simply achieved, while the necessary overcurrent and overvoltage protection mechanism is provided, effectively solving the problem of not being able to realize safety protection in time in the case of short circuit. This design is simple and easy to implement, which not only ensures the normal work of the battery monomer, but also significantly improves the safety and reliability of the battery monomer, effectively reduces the use of other parts, saves the occupied space of the battery monomer as a whole, and reduces the cost.

[0059] In an embodiment, the thickness of the insulating sheet 500 is between 0.03 mm and 1.0 mm.

[0060] The setting of the insulating sheet 500 can avoid the short circuit between the tab 220 of the battery monomer and the shell or other components, and play the role of insulation and sealing. The thickness of the insulating sheet is not less than 0.03 mm, and can be optionally set to 0.05 mm, 0.08 mm, 0.15 mm, 0.35 mm, 1.0 mm, etc. Thus, the electrical isolation between the inner core 200 and the outside can be effectively maintained, and the direct contact between the inner core 200 and the pole 400, the external conductor can be avoided. The thickness and size of the insulating sheet 500 can be flexibly set according to the structure, model, size, etc. of the battery monomer actually applied, which is not limited here.

[0061] Referring to Figure 2 In an embodiment, the shell 100 is hollow inside, and at least one end of the shell 100 has an opening. The shell 100 is hollow inside to accommodate the inner core 200, and the inner core is arranged in the shell 100 through the opening of at least one end of the shell 100.

[0062] The shell 100 can be single-sidedly open or double-sidedly open. When the shell 100 is single-sidedly open, a cover plate 300 can be arranged corresponding to the opening of one end of the shell 100. When the shell 100 is double-sidedly open, a cover plate can be arranged corresponding to the openings of both ends of the shell 100.

[0063] Referring to Figure 2 The shell 100 and the cover plate 300 arranged at the opening of the shell 100 form a sealed structure for accommodating the inner core 200.

[0064] The sealing structure formed by the shell 100 and the cover plate 300 can isolate the inner core from the external environment, preventing dust, moisture and impurities from entering, while providing support for the inner core 200, avoiding displacement or damage, thereby prolonging the service life of the battery cell. In addition, the sealing structure can also maintain the stability of the internal environment of the shell 100, ensuring the normal operation and performance of the battery cell. When the cover plate is detachable, it is convenient to replace, repair or check the inner core, improving the maintainability and flexibility of the system.

[0065] Optionally, the cover plate 300 is also provided with a liquid injection hole 310, which is used to inject electrolyte into the battery to ensure that the electrolyte can flow smoothly into the battery interior and be evenly distributed to each part of the inner core, so as to fully soak the inner core and ensure the charge and discharge performance of the battery.

[0066] Referring to Figure 2 , Figures 5 to 9 In an embodiment, the insulating sheet 500 is provided with a hole 510, and the tab 220 penetrates the hole 510 and is connected with the pole 400.

[0067] The insulating sheet 500 provides necessary physical support for the connection of the tab 220 and the pole 400 to a certain extent, ensuring the stability of the connection. The hole 510 serves as a hole for the tab 220 to pass through, allowing the tab 220 to penetrate the insulating sheet 500 through a specific position and be connected with the pole 400. The shape of the hole 510 can be any suitable shape, and the hole 510 can be optionally provided on at least one side of the insulating sheet 500, the middle of the insulating sheet 500, etc. The number, position and size of the hole 510 can be flexibly set according to actual conditions. When the insulating sheet 500 is provided with the hole 510, the tab 220 penetrates the hole 510 and is connected with the pole 400. This design allows the insulating sheet 500 to be fixed with the tab 220 through the hole 510, effectively preventing the insulating sheet 500 from being displaced or falling off during the use and transportation of the battery cell. This not only ensures the stability of electrical isolation and prevents problems such as battery cell failure caused by displacement or falling off of the insulating sheet 500, but also simplifies the assembly process of the battery cell, making the installation of the insulating sheet 500 more rapid and convenient.

[0068] In another embodiment, the insulating sheet 500 is provided with a slit, and the tab 220 penetrates the slit and is connected with the pole 400.

[0069] The slot is a tab passing slot, allowing the tab to pass through the insulating sheet 500 at a specific position and connect with the pole 400. The shape of the slot can be linear, curved, or any other suitable shape for actual use. The slot can be optionally arranged at any position of at least one side of the insulating sheet 500, the middle of the insulating sheet 500, etc. The number, position, and size of the slot can be flexibly set according to actual needs. The specific embodiments of the insulating sheet 500 provided with the slot can correspond to the aforementioned embodiments provided with the hole 510, and will not be described here.

[0070] Referring to Figure 2 , Figures 4 to 9 In an embodiment, the number of the inner core 200 is two, which are a first inner core 211 and a second inner core 212. The tab 220 of the first inner core 211 is a first tab 221, and the tab 220 of the second inner core 212 is a second tab 222. The first inner core 211 and the second inner core 212 are arranged in close contact with each other, and the first tab 221 and the second tab 222 are arranged in relative spacing.

[0071] At least one of the first tab 221 and the second tab 222 is provided with a through hole 230 connected with the mounting groove 2203.

[0072] The part of the tab 220 except the through hole 230 is used as a flow area, and the hole (or slot) provided on the insulating sheet 500 is used as a tab passing hole (or a tab passing slot). After the inner core 200 is short-circuited, the flow area of the tab 220 generates a large amount of heat, and the tab is fused. After the tab is fused, the insulating sheet 500 is clamped between the tab 220 and the cover plate 300, effectively preventing the safety problem of the tab from being overlapped again after being fused. This not only ensures the stability of electrical isolation, but also prevents problems such as battery cell failure caused by displacement or falling of the insulating sheet 500.

[0073] Referring to Figures 4 to 9 In an embodiment, the first tab 221, the second tab 222, the first inner core 211, and the second inner core 212 form a mounting groove 2203 therebetween, and the insulating sheet 500 is clamped between the tab 220 and the cover plate 300 through the mounting groove 2203.

[0074] Optionally, the length of the cover plate 300 and the length of the inner core 200 are determined by the relatively longer side of the cover plate 300 and the inner core 200, respectively, and the width of the cover plate 300 and the width of the inner core 200 are determined by the relatively shorter side of the cover plate 300 and the inner core 200, respectively. The first inner core 211 and the second inner core 212 are arranged along the width direction D2 of the inner core 200, and the first tab 221 and the second tab 222 are arranged in relative spacing. The mounting groove 2203 is formed between the first tab 221, the second tab 222, the first inner core 211, and the second inner core 212.

[0075] The tab 220 is used to realize the connection of the inner core 200 and the external circuit, but the tab 220 is relatively fragile, and the insulating sheet 500 with a certain mechanical strength is installed between the first tab 221 and the second tab 222, which can provide additional protection for the tab 220, prevent the tab 220 from being damaged due to external force during the assembly, transportation or use of the battery monomer, affect the performance of the battery monomer, and even cause safety hazards; the insulating sheet 500 is clamped between the tab 220 and the cover plate 300 through the installation groove 2203, so as to further realize the stable connection of the insulating sheet and the tab, simplify the assembly process of the battery monomer, and make the installation of the insulating sheet 500 more rapid and convenient. The tab 220 penetrates the insulating sheet 500, and the insulating sheet 500 is connected to the installation groove 2203 surrounded by the first tab 221, the second tab 222, the first inner core 211 and the second inner core 212, so as to ensure that when the tab 220 is fused due to short circuit, the insulating sheet 500 can be timely blocked on the fused tab 220, avoid the part of the fused tab 220 from being in secondary contact due to re-lapping and other reasons, effectively enhance the safety of the battery monomer; in this way, the occupied space of the battery monomer can be further reduced, the direct contact between the inner core 200 and the pole 400 and the external conductor can be avoided, and the battery monomer can be prevented from being affected by external dust, moisture, pollution and the like, thereby prolonging the service life of the battery monomer.

[0076] In some embodiments, the through hole 230 communicates with the installation groove 2203. This is to further optimize the fusing effect.

[0077] Taking the first tab 221 as an example:

[0078] Referring to Figures 4 to 9 At least part of the first tab 221 is made of a fusible material, which is used to be fused in time when the battery monomer encounters an abnormally large current, and is blocked on the fused tab 220 by the insulating sheet 500 clamped between the first inner core 211 and the second inner core 212, thereby effectively preventing the fused tab 220 from being in secondary contact due to re-lapping and other reasons, and enhancing the safety performance of the inner core 200.

[0079] The specific implementation of the second tab 222 can correspond to the embodiments of the first tab 221, and optionally, the through hole 230 is arranged only on the first tab 221 of the first inner core 211, or only on the second tab 222 of the second inner core 212, or on both the first tab 221 of the first inner core 211 and the second tab 222 of the second inner core 212; the through hole 230 arranged on each tab 220 can be one, two or other multiple, which can be specifically set according to actual conditions and is not limited herein.

[0080] Referring to Figures 4 to 9In an embodiment, the pole column 400 includes a positive pole column 410 and a negative pole column 420 which are spaced on the cover plate 300, the first pole lug 221 includes a first positive pole lug 2211 and a first negative pole lug 2212 which are spaced, and the second pole lug 222 includes a second positive pole lug 2221 and a second negative pole lug 2222 which are spaced.

[0081] The first positive pole lug 2211 and the second positive pole lug 2221 are arranged through the insulating sheet 500 and connected with the positive pole column 410 on the cover plate 300.

[0082] Specifically, the length of the cover plate 300 and the length of the inner core 200 are determined on the side with relatively longer length, and the width of the cover plate 300 and the width of the inner core 200 are determined on the side with relatively shorter length. The position of the positive pole column 410 of the cover plate 300 corresponds to the position of the positive pole lug of the inner core 200 and is connected with the positive pole lug of the inner core 200, and the position of the negative pole column 420 of the cover plate 300 corresponds to the position of the negative pole lug of the inner core 200 and is connected with the negative pole lug of the inner core 200.

[0083] The first pole lug 221 includes the first positive pole lug 2211 and the first negative pole lug 2212 which are spaced along the length direction D1 of the first inner core 211, and the second pole lug 222 includes the second positive pole lug 2221 and the second negative pole lug 2222 which are spaced along the length direction D1 of the second inner core 212. The position of the first positive pole lug 2211 corresponds to the position of the second positive pole lug 2221 and they are spaced, and the position of the first negative pole lug 2212 corresponds to the position of the second negative pole lug 2222 and they are spaced. Under the premise of ensuring the performance and safety of the battery monomer, the position of the pole lug 220 is reasonably arranged to reduce the space occupied by the battery monomer and improve the energy density of the battery monomer. When the insulating sheet 500 is assembled, the insulating sheet 500 is connected through the mounting groove 2203 formed by surrounding the first positive pole lug 2211, the second positive pole lug 2221, the first inner core 211 and the second inner core 212 (and the insulating sheet 500 is mounted through the mounting groove 2203 formed by surrounding the first negative pole lug 2212, the second negative pole lug 2222, the first inner core 211 and the second inner core 212).

[0084] The positive pole is the high potential section of the battery monomer, and the insulating sheet 500 is arranged corresponding to the first positive pole lug 2211 and the second positive pole lug 2221, which can respond in time when short circuit occurs, prevent the positive pole lug from being fused and cause secondary contact to cause short circuit due to re-lapping, and is used for further optimizing the safety of the battery monomer.

[0085] Referring to Figure 2 ,Figures 4 to 9 In the embodiment, the inner core 200 has oppositely arranged first and second ends 201 and 202, at least one of the first and second ends 201 and 202 of the inner core 200 has a tab 220, and when the end of the inner core 200 (the first end 201 or the second end 202) has the tab 220 at the end thereof, the tab at the end includes a first positive tab 2211, a first negative tab 2212, a second positive tab 2221, and a second negative tab 2222. The housing 100 is provided with a cover plate 300 corresponding to the opening at the end, and the tab 220 (at least including the first positive tab 2211 and the second positive tab 2221) penetrates the insulating sheet 500 and is connected to the pole 400 on the cover plate 300. When both ends (the first end 201 and the second end 202) of the inner core 200 have the tab 220, the tab at one end includes the first positive tab 2211 and the second positive tab 2221, and the tab at the other end includes the first negative tab 2212 and the second negative tab 2222. The housing 100 is provided with the cover plate 300 corresponding to the openings at the two ends, and the tab 220 (at least including the first positive tab 2211 and the second positive tab 2221) penetrates the insulating sheet 500 and is connected to the pole 400 on the cover plate 300.

[0086] Referring to Figure 2 , Figures 4 to 9 In an embodiment, the first tab 221 and the second tab 222 each have a first connecting portion 2201 and a second connecting portion 2202 connected as one body. The first connecting portion 2201 is arranged at the first end 201 of the inner core 200, and the second connecting portion 2202 penetrates the insulating sheet 500 and is connected to the pole 400.

[0087] It can be understood that the first connecting portion 2201 is arranged at the first end 201 of the inner core 200, the second connecting portion 2202 penetrates the insulating sheet 500 and is connected to the pole arranged on the cover plate 300, and the mounting groove 2203 is arranged between the first connecting portion 2201 and the second connecting portion 2202. The first tab 221 (the second tab 222) is arranged at the first end 201 of the inner core 200 through the corresponding first connecting portion 2201, and the second connecting portion 2202 is connected to the first connecting portion 2201 and is arranged at an angle with the first connecting portion 2201. When the insulating sheet 500 is assembled, the insulating sheet 500 is clamped between the first connecting portion 2201 and the second connecting portion 2202 through the mounting groove 2203, and the second connecting portion 2202 penetrates the insulating sheet 500 in a form of extending to the side of the insulating sheet 500 away from the inner core 200 and is connected to the pole 400 on the cover plate 300.

[0088] Referring to Figures 1 to 9In this application, optionally, an insulating sheet 500 is installed between the first positive electrode 2211 of the first electrode 221 and the second positive electrode 2221 of the second electrode 222, corresponding only to the positive electrode tab; or, an insulating sheet 500 is installed between the first positive electrode 2211 of the first electrode 221 and the second positive electrode 2221 of the second electrode 222, and another insulating sheet 500 is installed between the first negative electrode 2212 of the first electrode 221 and the second negative electrode 2222 of the second electrode 222; the specific configuration can be determined according to actual conditions and is not limited here.

[0089] This application mainly focuses on the example of an inner core 200 having a tab 220 at its first end 201, which includes a first positive tab 2211, a first negative tab 2212, a second positive tab 2221, and a second negative tab 2222. An insulating sheet 500 is assembled between the first positive tab 2211 of the first tab 221 and the second positive tab 2221 of the second tab 222, corresponding to the positive tab. An embodiment where an insulating sheet 500 is assembled between the first negative tab 2212 of the first tab 221 and the second negative tab 2222 of the second tab 222 can be referred to accordingly and will not be repeated here.

[0090] Reference Figures 6 to 9 In one embodiment, the first connecting portion 2201 of the first positive electrode tab 2211 is provided with a first through hole, and the first connecting portion 2201 of the second positive electrode tab 2221 is provided with a second through hole; the insulating sheet 500 is provided with a first hole corresponding to the first positive electrode tab 2211 and a second hole corresponding to the second positive electrode tab 2221, the first positive electrode tab 2211 passes through the first hole and is connected to the positive electrode post 410, and the second positive electrode tab 2221 passes through the second hole and is connected to the positive electrode post 410.

[0091] As the high-potential section of the battery cell, the positive electrode is equipped with an insulating sheet 500 corresponding to the first positive electrode tab 2211 and the second positive electrode tab 2221. This can respond promptly in the event of a short circuit and prevent a secondary short circuit caused by re-connection after the positive electrode tab melts. This is used to further optimize the safety of the battery cell.

[0092] Optionally, the insulating sheet 500 is disposed inside the housing 100. Before the inner core 200 is installed into the housing 100, the insulating sheet 500 can be connected to the first positive tab 2211 through the first hole, and then the first inner core 211 and the second inner core 212 can be attached to each other and connected to the second positive tab 2221 through the second hole; or, the insulating sheet 500 can be pre-installed between the first positive tab 2211 of the first inner core 211 and the second positive tab 2221 of the second inner core 212 directly through the first hole and the second hole; the specific assembly of the insulating sheet 500 can be completed according to the actual situation, and is not limited here.

[0093] Optionally, at least part of the first positive tab 2211 and at least part of the second positive tab 2221 are made of a fusible material.

[0094] In an embodiment, the first connecting portion 2201 is made of a fusible material such as aluminum; and the second connecting portion 2202 is optionally made of another metal material.

[0095] In another embodiment, the first connecting portion 2201 and the second connecting portion 2202 are both made of a fusible material, and specifically, the whole of the first positive tab 2211 and / or the second positive tab 2221 can be made of a fusible material such as aluminum.

[0096] The above description is merely exemplary embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structural transformation made according to the technical concept of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: case; The inner core is disposed within the housing; A cover plate is provided at the opening of the housing; The pole is disposed on the cover plate; An insulating sheet is disposed inside the housing; The inner core has a tab at its end, which penetrates the insulating sheet and is connected to the pole on the cover plate; at least a portion of the tab is made of a fusible material.

2. The battery cell as described in claim 1, characterized in that, The insulating sheet has a hole, and the electrode tab passes through the hole and is connected to the electrode post; Alternatively, the insulating sheet may have a slit, through which the tab passes and is connected to the pole post.

3. The battery cell as described in claim 1, characterized in that, The inner core consists of two parts, namely a first inner core and a second inner core. The first inner core has a first electrode tab, and the second inner core has a second electrode tab. The first inner core and the second inner core are fitted together, and the first electrode tab and the second electrode tab are spaced apart from each other. At least one of the first tab and the second tab is provided with a through hole for connection with the insulating sheet.

4. The battery cell as described in claim 3, characterized in that, An installation groove is formed between the first electrode tab, the second electrode tab, the first inner core, and the second inner core; the insulating sheet is snapped between the electrode tab and the cover plate through the installation groove.

5. The battery cell as described in claim 3, characterized in that, The electrode post includes a positive electrode post and a negative electrode post spaced apart on the cover plate; the first electrode tab includes a first positive electrode tab and a first negative electrode tab spaced apart; the second electrode tab includes a second positive electrode tab and a second negative electrode tab spaced apart. The first positive electrode tab and the second positive electrode tab are arranged at a distance from each other, and the first negative electrode tab and the second negative electrode tab are arranged at a distance from each other; The first positive electrode tab and the second positive electrode tab are disposed through the insulating sheet and connected to the positive electrode post on the cover plate.

6. The battery cell as described in claim 3, characterized in that, Both the first electrode tab and the second electrode tab have a first connecting part and a second connecting part that are connected as one unit; The first connecting part is located at the first end of the inner core, and the second connecting part passes through the insulating sheet and is connected to the pole post.

7. The battery cell as described in claim 1, characterized in that, The thickness of the insulating sheet is between 0.03 mm and 1.0 mm.

8. The battery cell according to any one of claims 1-7, characterized in that, The fusible material is at least one of aluminum, zinc, and aluminum alloy.

9. The battery cell according to any one of claims 1-7, characterized in that, The shell is hollow inside, and at least one end of the shell has the opening.

10. The battery cell as described in claim 9, characterized in that, The housing and a cover plate located at the opening of the housing form a sealed structure for accommodating the inner core.

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