Battery

Abstract

The utility model provides a battery. The battery comprises a shell; the core body is arranged in the shell; the top cover is arranged at the top end of the core body and is in packaging connection with the shell; the first insulating sheet is positioned between the core body and the shell and separates the core body from the shell; the first insulating strip is located between the top cover and the core body, the second insulating strip is located between the top cover and the core body and separates at least part of the core body and the top cover, the first insulating strip and the second insulating strip are arranged in a split mode, the first insulating strip and / or the second insulating strip are / is provided with connecting sections, and the first insulating strip and the second insulating strip are connected through the connecting sections. According to the utility model, the problem of poor insulation of the battery in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a battery. BACKGROUND

[0002] Battery shell material and the reaction between the material of electric core can cause the performance of electric core to decline. Specifically, taking the battery as a lithium ion battery and the battery shell as aluminum material as an example, since the size of the octahedral interstice of metal aluminum lattice is similar to lithium ion, it is easy to form intermetallic compound with lithium ion, if the octahedral of metal aluminum lattice inserts lithium ion, the alloy of LiAl is formed, which causes the corrosion of aluminum shell to electric core, and finally leads to the failure of electric core.

[0003] In the prior art, a layer of electric core insulating sheet (i.e. Mylar film) is added between the electric core and the aluminum shell inside the battery to isolate the electronic channel and ionic channel between lithium ion and metal aluminum, but the conventional electric core insulating sheet wrapping electric core is usually a larger insulating sheet, which is located at the bottom surface of the electric core and is folded upwards, so as to wrap the bottom surface and four side surfaces of the electric core, wherein the part of the insulating sheet corresponding to the top of the electric core side surface is connected to the top cover by hot melting process, since the hot melting process usually fixes several points, it cannot completely isolate the electronic channel and ionic channel between lithium ion and metal aluminum, resulting in the existence of gap between the top cover and the electric core, and further leading to the problem of poor insulation between the electric core and the aluminum shell inside the battery. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a battery to solve the problem of poor insulation between the electric core and the aluminum shell inside the battery in the prior art.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a battery is provided, which comprises: a shell; a core body arranged in the shell; a top cover arranged at the top end of the core body and connected with the shell; a first insulating sheet arranged between the core body and the shell and separating the core body and the shell; a second insulating sheet arranged between the top cover and the core body and separating at least part of the core body and the top cover, the first insulating sheet and the second insulating sheet are arranged separately, the first insulating sheet and / or the second insulating sheet has a connecting section, and the first insulating sheet and the second insulating sheet are connected through the connecting section.

[0006] Further, the second insulating sheet comprises: a main body part arranged between the top surface of the core body and the top cover and separating the top surface of the core body and the top cover; and a first connecting section arranged at the edge of the main body part and bendably connected with the main body part, the first connecting section serving as at least part of the connecting section and being used for connecting with the first insulating sheet.

[0007] Further, the main body part and the first connecting section form a bending indentation line, the indentation line has a depth of 0.005mm-1.95mm, and the second insulating sheet is provided with the indentation line on one side or both sides.

[0008] Further, the first connecting section is multiple, and the main body part is provided with the first connecting section at the circumferential edge.

[0009] Further, the second insulating sheet has a thickness of 0.01mm-2mm.

[0010] Further, the core includes a winding core and a matching structure, the matching structure is located at a first surface of the winding core, the second insulating sheet has an avoiding structure, the matching structure cooperates with the structure outside the winding core or the battery through the avoiding structure, and the second insulating sheet shields other areas on the first surface except the matching structure.

[0011] Further, the matching structure includes an adapter, the second insulating sheet has a through hole, and the adapter is connected with the pole of the top cover after being arranged in the through hole.

[0012] Further, the matching structure includes an explosion-proof structure, the second insulating sheet has an explosion-proof hole, and the explosion-proof structure is located at the explosion-proof hole.

[0013] Further, the adapter is multiple, the explosion-proof structure is located between two adapters, the second insulating sheet further has a liquid injection hole, and the liquid injection hole is located between the adapter and the explosion-proof structure.

[0014] Further, the connecting section has an adhesive layer, the first insulating sheet and the second insulating sheet are connected through the adhesive layer, the adhesive layer has a thickness of 0.001mm-2mm, and the second insulating sheet is provided with the adhesive layer on one side or both sides.

[0015] Further, the first insulating sheet includes a bottom surface part, multiple side surface parts, and multiple connecting parts, the opposite sides of the bottom surface part are connected with the side surface parts through bending, the opposite sides of the side surface parts are connected with the connecting parts through bending, the bottom surface part is located at the bottom surface of the core, the side surface parts and the connecting parts are located at the side surface of the core, and the connecting parts on the side edges close to each other between the side surface parts are at least partially overlapped.

[0016] The technical scheme of the utility model discloses, through setting first insulating sheet and second insulating sheet between core body and shell and top cover respectively, first insulating sheet and second insulating sheet adopt the mode of setting in two parts between two, and mutually cooperate between two and realize mutual connection through connecting section, so that realize that core body is wrapped and is set in shell, and through top cover sealing installation in shell opening place forms battery, through first insulating sheet and second insulating sheet, the isolation between core body and shell and between core body and top cover is realized respectively, and then the transmission path of lithium ion of core body and electron between top cover and shell is blocked off.Compared with traditional mode, because the second insulating sheet is set in the embodiment, so that the second insulating sheet can cover the top surface of the core body, thereby avoiding the situation that in the traditional mode, when the top of the first insulating sheet is connected and fixed with the top cover by hot melting, due to the gap, the insulation is insufficient, and the purpose of improving the insulation effect is realized.Meanwhile, the first insulating sheet and the second insulating sheet are set in two parts, and are connected by the connecting section, which not only ensures the insulation effect, but also makes the processing mode simpler and faster. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description, explain the application. Such an embodiment of the application, and the description thereof, are not to be unduly limited to the specific embodiment disclosed herein, and indeed can vary. In the drawings:

[0018] Figure 1 The battery overall structure schematic diagram of the utility model is shown;

[0019] Figure 2 The second insulating sheet folded structure schematic diagram of Figure 1 The battery overall structure explosion map is shown;

[0020] Figure 3 The second insulating sheet unfolded structure schematic diagram of Figure 1 The first insulating sheet folded structure schematic diagram of

[0021] Figure 4 The first insulating sheet unfolded structure schematic diagram of Figure 3 The second insulating sheet unfolded structure schematic diagram of

[0022] Figure 5 The first insulating sheet folded structure schematic diagram of Figure 1 The first insulating sheet unfolded structure schematic diagram of

[0023] Figure 6 The first insulating sheet unfolded structure schematic diagram of Figure 5

[0024] Among them, the above drawing includes the following figure marks:

[0025] ​10. Shell; 11. Insulating film; 20. Core; 21. Adapter; 22. Explosion-proof structure; 23. First side; 24. Second side; 30. Top cover; 31. Top cover patch; 40. First insulating sheet; 41. Bottom part; 42. Side part; 43. Connecting part; 44. Positioning hole; 50. Second insulating sheet; 51. Main body; 52. First connecting section; 53. Through hole; 54. Explosion-proof hole; 60. Positive terminal; 61. Negative terminal. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0028] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0029] To address the problem of poor battery insulation in existing technologies, this invention provides a battery.

[0030] like Figures 1 to 6 As shown, a battery in this embodiment includes: a casing 10, a core 20, a top cover 30, a first insulating sheet 40, and a second insulating sheet 50. The core 20 is disposed inside the casing 10; the top cover 30 is disposed at the top of the core 20 and is encapsulated and connected to the casing 10; the first insulating sheet 40 is located between the core 20 and the casing 10, and separates the core 20 from the casing 10; the second insulating sheet 50 is located between the top cover 30 and the core 20, and separates at least a portion of the core 20 from the top cover 30. The first insulating sheet 40 and the second insulating sheet 50 are separately disposed, and the first insulating sheet 40 and / or the second insulating sheet 50 have connecting sections, and the first insulating sheet 40 and the second insulating sheet 50 are connected by the connecting sections.

[0031] The first insulating sheet 40 and the second insulating sheet 50 are respectively arranged between the core 20 and the shell 10 and between the shell 10 and the top cover 30, and the first insulating sheet 40 and the second insulating sheet 50 are arranged in a split manner and are connected to each other through the connecting section, so that the core 20 is wrapped and arranged in the shell 10, and the top cover 30 is sealingly arranged at the opening of the shell 10 to form a battery. The first insulating sheet 40 and the second insulating sheet 50 respectively realize the insulation between the core 20 and the shell 10 and between the core 20 and the top cover 30, thereby blocking the transmission path of lithium ions in the core 20 and electrons between the top cover 30 and the shell 10. Compared with the conventional method, the second insulating sheet 50 is arranged in the embodiment, so that the second insulating sheet 50 can cover the top surface of the core 20, thereby avoiding the insufficient insulation caused by the gap between the top of the first insulating sheet 40 and the top cover 30 in the conventional method, and achieving the purpose of improving the insulation effect. Meanwhile, the first insulating sheet 40 and the second insulating sheet 50 are arranged in a split manner and connected through the connecting section, which not only ensures the insulation effect, but also makes the processing method simpler and faster.

[0032] In summary, the battery provided by the embodiment of the application is in an isolated state between the core 20 and the top cover 30 through the cooperation and connection of the first insulating sheet 40 and the second insulating sheet 50, thereby avoiding the situation that lithium ions are embedded into the crystal octahedron of the shell 10 to form lithium-aluminum alloy after the lithium ions in the core 20 leak, so as to cause corrosion of the shell 10 and finally cause the battery to fail. Moreover, the first insulating sheet 40 and the second insulating sheet 50 are arranged in a split manner and connected through the connecting section, so that the second insulating sheet 50 can play a sufficient insulation role. Compared with the situation that the first insulating sheet 40 and the second insulating sheet 50 are arranged in one body and then wrapped around the core 20 through folding, the gap caused by folding is avoided to cause the conduction between the electron channel and the ion channel, and the stable connection between the first insulating sheet 40 and the second insulating sheet 50 is ensured, thereby significantly improving the insulation performance of the battery.

[0033] It should be noted that the core 20 can include one or more battery cells, and the battery cell can be of a winding type. When a plurality of battery cells are arranged, the battery cells can be stacked and connected in series to form the entire core 20.

[0034] Exemplarily, the first insulating sheet 40 is foldable, and can form a containing space for containing the core 20 after being folded. The core 20 is placed in the containing space formed by folding the first insulating sheet 40, and the first insulating sheet 40 is in contact with the bottom surface and the side surface of the core 20, so as to realize the isolation between the bottom surface and the side surface of the core 20 and the shell 10. The second insulating sheet 50 covers the top surface of the core 20. The specific arrangement position of the connecting section can be adjusted, which can be arranged only on the first insulating sheet 40, or only on the second insulating sheet 50, or on both the first insulating sheet 40 and the second insulating sheet 50.

[0035] As Figure 3 and Figure 4As shown, in the present embodiment, the second insulating sheet 50 comprises a main body part 51 and a first connecting section 52, the main body part 51 is in the form of an integral sheet, and the main body part 51 is located between the top cover 30 and the top surface of the core body 20, so as to be capable of being arranged on the top surface of the core body 20, thereby achieving the effect of separating the top surface of the core body 20 from the top cover 30, and further preventing the electronic channel and the ion channel from being conducted to react, and avoiding the corrosion of the aluminum shell, the leakage of the battery cell and the failure of the battery cell caused thereby. The shape of the main body part 51 in the present embodiment is basically the same as that of the top surface of the core body 20, and since the top surface of the core body 20 is generally in the form of a long strip, the main body part 51 is also in the form of a long strip, so that the main body part 51 can be matched with the top surface of the core body 20 and the top cover 30, and the main body part 51 can be completely attached to the top surface of the core body 20, thereby improving the insulation effect of the upper part of the battery structure. Different from the main body part 51, the first connecting section 52 is located at the edge of the main body part 51 and is bendably connected with the main body part 51, and the first connecting section 52 is used to connect with the first insulating sheet 40 as at least a part of the connecting section. Since the first connecting section 52 is in the form of a bendable connection with the main body part 51, the first connecting section 52 can be bent towards the first insulating sheet 40, so that the first connecting section 52 can be overlapped with and connected to the top edge of the first insulating sheet 40, thereby realizing the connection between the first insulating sheet 40 and the second insulating sheet 50 through the cooperation of the first connecting section 52 and the first insulating sheet 40, so that the first insulating sheet 40 and the second insulating sheet 50 can form a continuous insulating barrier between the core body 20 and the top cover 30, thereby enhancing the insulation performance of the battery and ensuring the stability and integrity of the internal structure of the battery. On the one hand, by arranging the main body part 51 and the first connecting section 52 on the second insulating sheet 50, the insulation performance of the battery is significantly improved, the adverse reaction between the lithium ion and the shell 10 is effectively avoided, and the safety of the battery is enhanced. On the other hand, the design of the first connecting section 52 ensures the stable connection between the first insulating sheet 40 and the second insulating sheet 50, and even if affected by the expansion force and other factors caused by the expansion of the battery during use, the first insulating sheet 40 and the second insulating sheet 50 can still maintain good connection and insulation effect, thereby improving the overall stability and service life of the battery.

[0036] It should be noted that, since the second insulating sheet 50 is provided with the connecting section only, the first connecting section 52 is the whole connecting section, i.e. the connection between the first insulating sheet 40 and the second insulating sheet 50 is realized by using the first connecting section 52 only. In addition to the above-mentioned mode of providing the first connecting section 52 only, other modes can also be adopted, for example, the second connecting section is provided on the first insulating sheet 40 only, the second connecting section is folded in a bent form to the plane where the second insulating sheet 50 is located to realize the connection, or the first connecting section and the second connecting section are provided simultaneously, and the connection between the first insulating sheet 40 and the second insulating sheet 50 is realized by the cooperation between the first connecting section and the second connecting section.

[0037] Optionally, the design of the second insulating sheet 50 needs to consider the bending performance of the material, to ensure that the second insulating sheet 50 can be folded flexibly and aligned accurately with the first insulating sheet 40 during the battery packaging process, to ensure the strength and reliability of the connection. The material of the second insulating sheet 50 is usually PP, PE, PET or other insulating materials, and the thickness is preferably between 0.01 mm and 2 mm. When the second insulating sheet 50 is provided with the connecting section, i.e. the second insulating sheet 50 adopted in the embodiment includes the main body part 51 and the first connecting section 52, a score line for bending is formed at the connection between the main body part 51 and the first connecting section 52, so that the second insulating sheet 50 can be bent along the score line when the whole second insulating sheet 50 is bent. Preferably, the depth of the score line is between 0.005 mm and 1.95 mm, and the score line can be provided on one side or both sides of the second insulating sheet 50, so as to avoid the breakage between the main body part 51 and the first connecting section 52, and to ensure the bending of the first connecting section 52, taking into account both bending and integrity. Of course, the above-mentioned materials, parameters and the like of the second insulating sheet 50 can be adjusted as needed, and are not limited to the settings of the embodiment. At the same time, the first insulating sheet 40 can also be provided with the above-mentioned materials, parameters and the like of the second insulating sheet 50.

[0038] The second insulating sheet 50 of the embodiment is folded from a sheet along the score line, specifically, the score line is provided between the periphery of the main body part 51 and the first connecting section 52, and the first connecting section 52 distributed around the main body part is folded downward along the score line, forming a box-shaped structure with the opening downward, i.e. the structure after folding is the specific structure form of the second insulating sheet 50 during installation. For example, the second insulating sheet 50 is in a sheet form without bending when it is initially processed, the main body part 51 and the first connecting section 52 are in the same plane, and then the first connecting section 52 is folded along the score line, so that the second insulating sheet 50 forms a box-shaped form, and the middle part surrounds a certain thickness of the accommodating area, so that the second insulating sheet 50 can be covered on the top end of the core 20, to realize the effect of separating the core 20 and the top cover 30.

[0039] AsFigure 4 As shown, in the present embodiment, the first connecting section 52 is multiple, and the first connecting section 52 is arranged at the circumferential edge of the main body 51. By arranging multiple first connecting sections 52 at the circumferential edge of the main body 51, the connection between the second insulating sheet 50 and the first insulating sheet 40 is more stable and uniform, on the one hand, the covering degree of the insulating sheet to the core 20 and the shell 10 is improved, and the reliability of the connection is also increased, effectively preventing the loosening or falling off of the connecting section, and ensuring the stability of the internal structure of the battery; on the other hand, the multiple first connecting sections 52 form a continuous and closed insulating layer with the main body 51, effectively isolating the electronic and lithium sub-paths between the core 20 and the shell 10 and the top cover 30, significantly improving the safety and reliability of the battery. Based on the above arrangement, when the second insulating sheet 50 is folded to form the accommodating area, the top surface of the accommodating area is the main body 51, the circumferential side surface is the first connecting section 52, and the bottom surface is in the form of an opening. The second insulating sheet 50 is arranged on the top surface of the core 20 through the opening, so that a part of the core 20 is accommodated in the accommodating area, and the connection effect between the first connecting section 52 and the first insulating sheet 40 is realized.

[0040] In the present embodiment, the core 20 includes a winding core and a matching structure, the matching structure is located at the first surface of the winding core, the first surface of the present embodiment is the top surface of the winding core, and the matching structure is used to cooperate with other components of the battery, such as the subsequent pole column and the like, or with other structures outside the battery, so as to realize the external connection and the like of the winding core. Based on the arrangement of the matching structure, since the matching structure needs to pass through the second insulating sheet 50 for cooperation, the second insulating sheet 50 of the present embodiment has a avoiding structure, which can adopt a recess, a hole groove and the like, and the avoiding structure is arranged correspondingly between the matching structure, so that the matching structure cooperates with the structure outside the winding core or the battery through the avoiding structure, and realizes the external cooperation of the winding core.

[0041] It should be noted that since the matching structure needs to pass through itself or has a gas medium passing through, the second insulating sheet 50 cannot cover the entire area of the top surface of the core 20, therefore, the second insulating sheet 50 of the present embodiment substantially separates part of the core 20 and the top cover 30, that is, the other regions of the top surface of the core 20 except the matching structure are all shielded by the main body 51 of the second insulating sheet 50, so as to ensure the separation insulation effect. Of course, when the top surface of the core 20 is not provided with the matching structure, but forms an integral plane, the main body 51 covers the entire top surface of the core 20, so that the second insulating sheet 50 at this time completely separates the core 20 and the top cover 30.

[0042] As Figure 2As shown, in the embodiment, the matching structure includes a transition part 21 in the form of a transition sheet, and correspondingly, the avoiding structure includes a through hole 53, so that the transition part 21 is arranged in the through hole 53, thereby achieving the purpose of connecting the pole of the top cover 30. The type and specific number of the transition part 21 can be set as needed, and a transition protruding column can also be used. Since the core 20 has positive and negative poles, the transition part 21 includes positive and negative transition sheets, thereby achieving the electrical connection of the positive and negative poles of the core 20 with the positive pole 60 and the negative pole 61 on the top cover 30. Correspondingly, the number of the through hole 53 matches the number of the transition part 21, and the through hole 53 is also provided with two, and the size of the two through holes 53 is matched with the size of the transition part 21, so as to avoid the transition part 21 as much as possible, without affecting the insulation effect of the second insulating sheet 50. In this way, by arranging the through hole 53 in the main body part 51, not only the conduction of electrical connection is ensured, but also the direct contact between the transition part 21 and the top cover 30 is further isolated, the risk of short circuit is reduced, and the safety performance of the battery is improved.

[0043] Optionally, in a possible implementation, the matching structure includes an anti-explosion structure 22, and correspondingly, the avoiding structure includes an anti-explosion hole 54, the anti-explosion structure 22 is located at the anti-explosion hole 54, and the two are preferably arranged in alignment, so that when the pressure in the core 20 increases, the anti-explosion structure 22 can play a role, and the pressure can be discharged in time through the anti-explosion structure 22 and the anti-explosion hole 54, thereby avoiding explosion of the core 20 and the like, and ensuring the safety of the battery during use. The specific form of the anti-explosion structure 22 can be set as needed, and the form of the anti-explosion hole 54 can also be adjusted accordingly, for example, the anti-explosion hole 54 can be in the form of a large overall hole, or a plurality of small holes can be arranged in an interval, as long as it can cooperate with the anti-explosion structure 22 to achieve the timely discharge of pressure.

[0044] On the basis of the above-mentioned anti-explosion structure 22 and anti-explosion hole 54, the anti-explosion structure 22 can be arranged between the two transition parts 21 of the positive and negative poles, so that the upper surface of the core 20 is in the form of one transition part 21, an anti-explosion structure 22, and another transition part 21 in sequence, and correspondingly, the arrangement on the second insulating sheet 50 is in the form of one through hole 53, an anti-explosion hole 54, and another through hole 53, and the three are arranged in an interval to ensure the shielding and insulating effect of the second insulating sheet 50.

[0045] Optionally, in addition to the above-mentioned transition part 21 and anti-explosion structure 22, other structures can also be arranged as needed, for example, a liquid injection hole can be arranged, and the liquid injection hole can be arranged between the transition part 21 and the anti-explosion structure 22, and correspondingly, the avoiding structure includes an avoiding hole, which is arranged in alignment between the liquid injection hole, so that the liquid injection hole and the avoiding hole can be used to realize the liquid injection and the like of the core 20.

[0046] As Figures 5 to 6 shown in the embodiment, the first insulating sheet 40 comprises a bottom surface part 41, a side surface part 42 and a connecting part 43, the side surface part 42 is located at the edge of the bottom surface part 41 and is bendably connected with the bottom surface part 41, the connecting part 43 is located at the edge of the side surface part 42 and is bendably connected with the side surface part 42, the bottom surface part 41 is located at the bottom surface of the core 20, and the side surface part 42 and the connecting part 43 are both located at the side surface of the core 20. In this way, through the design of the bottom surface part 41, the side surface part 42 and the connecting part 43 of the first insulating sheet 40, the isolation between the side surface and the bottom surface of the core 20 and the shell 10 is ensured, and the safety and stability of the battery are effectively improved. Specifically, the bottom surface part 41 is located at the bottom surface of the core 20 and closely adheres to the bottom surface of the core 20. The size and shape of the bottom surface part 41 are determined according to the specific design of the bottom surface of the core 20, so as to completely cover the bottom surface of the core 20 and form an insulating isolation barrier, which can effectively isolate the electronic and lithium transmission paths between the bottom surface of the core 20 and the shell 10. The side surface part 42 forms a continuous insulating structure at the edge of the bottom surface part 41, and when cooperating with the core 20, the side surface part 42 wraps the side edge of the core 20 and closely adheres to the side surface of the core 20 through bending, thereby further enhancing the insulating effect between the core 20 and the shell 10. Similarly, the thickness of the side surface part 42 is the same as that of the bottom surface part 41, and the shape and size thereof are designed according to the shape and size of the core 20 to ensure that the side surface part 42 can properly wrap the side surface of the core 20. The connecting part 43 is an extension of the side surface part 42 and is located at the edge of the side surface part 42. Similarly, the connecting part 43 is connected with the side surface part 42 through bendable connection. The connecting part 43 connects the side surface parts 42 together and blocks the side surface part that cannot be blocked by the side surface part 42, so that the first insulating sheet 40 forms an insulating structure with an open upper end and blocked side surface and bottom end. When cooperating with the second insulating sheet 50, the electronic and lithium transmission paths between the core 20, the shell 10 and the top cover 30 can be completely isolated. In one aspect, through the design of the bottom surface part 41, the side surface part 42 and the connecting part 43, the first insulating sheet 40 can completely cover the bottom surface and the side surface of the core 20 and form a continuous and closed insulating layer, thereby significantly enhancing the insulating performance of the battery. In another aspect, the bendable connection design of the side surface part 42 and the connecting part 43 enables the first insulating sheet 40 to adapt to the shape and size changes of the core 20 during packaging, thereby ensuring the close adhesion with the core 20 and forming a stable connection with the second insulating sheet 50, and improving the overall stability and safety of the battery.

[0047] As Figures 5 to 6As shown, in the embodiment, the side portions 42 are multiple and located at opposite sides of the bottom portion 41, that is, the bottom portion 41 of the first insulating sheet 40 is provided with the side portions 42 at both sides, so that the side portions 42 can shield opposite sides of the core 20. Correspondingly, the connecting portions 43 are multiple and each side portion 42 is provided with the connecting portions 43 at opposite sides, so that when the side portions 42 are folded upward, the connecting portions 43 are also folded upward, and then when the side portions 42 stand, the connecting portions 43 are bent relative to the side portions 42, so that the connecting portions 43 of the sides of the opposite side portions 42 close to each other, and the two connecting portions 43 are connected together in a stacked manner, so that the first insulating sheet 40 can form a box-shaped structure with an upper opening, and the core 20 is accommodated in the box-shaped structure. The connecting portions 43 can be connected in a manner as required, which can be directly stacked together or connected by means of gluing.

[0048] In order to further clarify the structure of the first insulating sheet 40, the embodiment takes the core 20 as a standing cuboid as an example, which has opposite first sides 23 and opposite second sides 24 in addition to the bottom and top surfaces, wherein the area of the first side 23 is greater than that of the second side 24, as shown. Figure 2 Based on the above structure, the side portions 42 of the first insulating sheet 40 are located at the first sides 23, and the connecting portions 43 are located at the second sides 24, and the area of the connecting portion 43 is greater than half of the area of the second side 24, so that the side portions 42 on the first insulating sheet 40 are used to shield the sides of the core 20 with a larger area, and the connecting portions 43 are used to shield the sides of the core 20 with a smaller area, and the area of the connecting portion 43 is designed to be greater than half of the area of the second side 24, which ensures that the two connecting portions 43 located at the same second side 24 can be partially stacked after completely covering the second side 24, so that a sufficient connection strength can be formed during connection, and the shielding effect of the second side 24 is ensured.

[0049] It should be noted that the structure of the first insulating sheet 40 is not limited to the above form, and can be adjusted as required. For example, the side portions 42 are provided at the four peripheral edges of the bottom portion 41, and the side portions 42 are bent upward to surround the four peripheral sides of the core 20, at this time, a small extension section can be provided at the longitudinal edge of the side portion 42, which is used to connect the side portions 42 together to ensure the stability of the first insulating sheet 40 after folding, or the extension section can not be provided, and the first insulating sheet 40 can maintain the box-shaped structure after folding by the action of the shell 10 and the core 20.

[0050] The indentation lines are also arranged between the bottom surface part 41 and the side surface part 42 and between the side surface part 42 and the connecting part 43 in the embodiment, so that the first insulating sheet 40 is also folded by the planar sheet material. The depth of the indentation lines on the first insulating sheet 40, the single-sided or double-sided arrangement and the like can refer to the arrangement mode of the indentation lines on the second insulating sheet 50.

[0051] As shown in Figure 5 and Figure 6 In the embodiment, the bottom surface part 41 has the positioning hole 44 for positioning, which can facilitate the positioning when cooperating with the core 20 or the wrapping part during the process of wrapping the core 20 by the first insulating sheet 40, so as to ensure the position stability of the first insulating sheet 40 and the processing accuracy.

[0052] In the embodiment, the connecting section has the adhesive layer, and the first insulating sheet 40 and the second insulating sheet 50 are connected by the adhesive layer. In the embodiment, since the first connecting section 52 is arranged on the second insulating sheet 50 as the connecting section, the adhesive layer is arranged on the second insulating sheet 50 in the embodiment, and the first connecting section 52 is adhered at the upper edge of the first insulating sheet 40 by the adhesive layer. Of course, the adhesive layer can also be arranged at the upper edge of the first insulating sheet 40 to realize the connection with the first connecting section 52. It should be noted that when the arrangement mode of the connecting section is changed, the specific arrangement mode of the adhesive layer can also be adjusted accordingly, for example, when the second connecting section is arranged at the upper edge of the first insulating sheet 40, the adhesive layer can be arranged on the second connecting section to realize the adhesion. The above-mentioned adhesion mode not only improves the stability of the connection between the two insulating sheets, but also ensures the effective insulation between the internal components of the battery, especially between the core 20 and the top cover 30, and avoids the risk of internal short circuit of the battery; and the battery packaging process is simplified, the production efficiency is improved, and the production cost is reduced.

[0053] The adhesive layer in the embodiment is double-sided adhesive tape, which can be continuous or segmented, and the thickness of the double-sided adhesive tape is between 0.001 mm and 2 mm. The double-sided adhesive tape can be arranged on one side or both sides of the second insulating sheet 50, as long as the first insulating sheet 40 and the second insulating sheet 50 can be tightly connected.

[0054] The top cover 30 in the embodiment is also provided with the top cover patch 31, and the top cover patch 31 is arranged on the upper surface of the top cover 30. The outer surface of the shell 10 is also covered with the insulating film 11 to further play the role of insulation and sealing.

[0055] It should be noted that the plurality of in the above-mentioned embodiments means at least two.

[0056] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0057] 1. The battery insulation problem in the prior art is solved;

[0058] 2. The first and second insulation sheets respectively achieve insulation between the core and the shell and between the core and the top cover, thereby blocking the transmission path of lithium ions in the core and electrons between the top cover and the shell;

[0059] 3. The traditional folding method is avoided, which causes gaps, and the heat melting cannot completely cover all gaps, thereby causing insufficient insulation, and the purpose of improving insulation effect is achieved;

[0060] 4. The split setting method and the connection segment connection form are simpler and more convenient than the traditional folding and heat melting processing method;

[0061] 5. The indentation line avoids the breakage between the main body and the first connecting segment, and can ensure the bending of the first connecting segment, taking into account the bending and integrity of the two aspects.

[0062] Obviously, the above-described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0063] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0064] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized by, The application relates to a battery, which comprises the following parts: a shell (10); a core (20) arranged in the shell (10); a top cover (30) arranged at the top end of the core (20) and connected with the shell (10); a first insulating sheet (40) arranged between the core (20) and the shell (10) and separating the core (20) from the shell (10); a second insulating sheet (50) arranged between the top cover (30) and the core (20) and separating at least part of the core (20) from the top cover (30), the first insulating sheet (40) and the second insulating sheet (50) being arranged separately, the first insulating sheet (40) and / or the second insulating sheet (50) having a connecting section, and the first insulating sheet (40) and the second insulating sheet (50) being connected through the connecting section.

2. The battery of claim 1, wherein, The second insulating sheet (50) comprises: a main body (51) arranged between the top cover (30) and the top surface of the core (20) and separating the top surface of the core (20) from the top cover (30); a first connecting section (52) arranged at the edge of the main body (51) and bendably connected with the main body (51), the first connecting section (52) serving as at least part of the connecting section and being used for connecting with the first insulating sheet (40).

3. The battery of claim 2, wherein, An indentation line for bending is formed between the main body (51) and the first connecting section (52), the indentation line has a depth of 0.005 mm to 1.95 mm, and the second insulating sheet (50) is provided with the indentation line on one side or both sides.

4. The battery of claim 2, wherein, The first connecting section (52) is provided at the circumferential edge of the main body (51).

5. The battery of claim 1, wherein, The thickness of the second insulating sheet (50) is 0.01 mm to 2 mm.

6. The battery of claim 1, wherein, The core (20) comprises a winding core and a matching structure arranged at the first surface of the winding core, the second insulating sheet (50) has an avoiding structure, the matching structure is matched with the structure outside the winding core or outside the battery through the avoiding structure, and the second insulating sheet (50) shields other regions on the first surface except the matching structure.

7. The battery of claim 6, wherein, The matching structure comprises a switching part (21), the avoiding structure comprises a through hole (53), the switching part (21) is connected with the pole column of the top cover (30) after being arranged in the through hole (53), and / or the matching structure comprises an anti-explosion structure (22), the avoiding structure comprises an anti-explosion hole (54), and the anti-explosion structure (22) is arranged at the anti-explosion hole (54).

8. The battery of claim 7, wherein, The switching part (21) is provided in plurality, the anti-explosion structure (22) is arranged between two switching parts (21), and the second insulating sheet (50) further has a liquid injection hole arranged between the switching part (21) and the anti-explosion structure (22).

9. The battery of any one of claims 1-8, wherein, The connecting section has a bonding layer, the first insulating sheet (40) and the second insulating sheet (50) are bonded by the bonding layer, the thickness of the bonding layer is 0.001mm-2mm, and the single face or double face of the second insulating sheet (50) is provided with the bonding layer.

10. The battery of any one of claims 1-8, wherein, The first insulating sheet (40) comprises: a bottom surface part (41); a plurality of side surface parts (42), the opposite sides of the bottom surface part (41) are both connected with the side surface parts (42) by bending; a plurality of connecting parts (43), the opposite sides of the side surface parts (42) are both connected with the connecting parts (43) by bending, the bottom surface part (41) is located at the bottom surface of the core (20), the side surface parts (42) and the connecting parts (43) are both located at the side surface of the core (20), and the connecting parts (43) on the side edges of the side surface parts (42) close to each other are at least partially overlapped.

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