Shell assembly of battery and battery

Abstract

The utility model relates to a battery shell assembly and a battery, the battery shell assembly comprises a shell, an end cover, a sleeve and an insulating plate, the shell is provided with a bottom wall and a side wall, and the side wall comprises a main side part and a bending part; the end cover is provided with a terminal part and an eave part, and the eave part is located between the bending part and the bottom wall and is in insulation connection with the side wall; the casing pipe is sleeved outside the shell; the insulating plate comprises an inner side part, an outer side part arranged at the periphery of the inner side part, and a connecting part connected between the inner side part and the outer side part, the outer side part is at least partially clamped between the sleeve and the bending part, the inner side part is provided with a through hole through which the terminal part penetrates, and the inner side part is closer to the bottom wall than the outer side part; according to the insulating plate, the inner side part is closer to the bottom wall than the outer side part, so that the negative influence caused by deformation is reduced, the labeling yield is improved, the stable realization of various functions is ensured, and the production yield, the appearance quality, the safety and the reliability of the battery are improved.

Description

TECHNICAL FIELD

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

[0002] A battery sleeve label is a specially designed label or protective film (commonly referred to as a sleeve) that is applied to the battery shell during the manufacturing process to enhance the appearance, protect the surface, display the brand and product information, and provide additional insulation protection to prevent short circuits. During the sleeve labeling process, the sleeve needs to go through a process step such as heating or cooling to shrink and tightly adhere to the battery shell. In order to provide a buffer space for thermal expansion and contraction, compensate for manufacturing tolerances, and release external stress, a deformation gap is provided between the sleeve and the terminal. These deformation gaps can ensure that the sleeve can freely shrink and deform during the sleeve labeling process, avoiding breakage or poor deformation caused by excessive tightness.

[0003] However, if the deformation gap is not properly handled, it will not only affect the appearance of the battery, but also cause foreign matter to enter the battery, causing short circuits, affecting insulation effects, and other adverse effects. CONTENT OF THE INVENTION

[0004] The present application provides a battery shell assembly and a battery to improve the production yield, appearance quality, safety and reliability of the battery to at least partially solve the above technical problems.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the present application, a battery shell assembly is provided, comprising:

[0006] a shell having a bottom wall and a side wall, the side wall including a main side portion connected to the outer periphery of the bottom wall, and a curved portion extending from one end of the main side portion away from the bottom wall to the center axis of the shell;

[0007] a cover having a terminal portion and a eave portion connected to the outer periphery of the terminal portion, the eave portion being located on the side of the curved portion facing the bottom wall and being insulatedly connected with the side wall;

[0008] a sleeve covering the shell; and

[0009] an insulating plate including an inner side portion, an outer side portion provided on the periphery of the inner side portion, and a connecting portion connected between the inner side portion and the outer side portion, the outer side portion being at least partially clamped between the sleeve and the curved portion, the inner side portion being provided with a through hole for passing the terminal portion, and the inner side portion being arranged closer to the bottom wall than the outer side portion.

[0010] Optionally, the connecting portion is arranged obliquely, and in the radial direction of the through hole, the inner periphery of the connecting portion is arranged closer to the through hole than the outer periphery of the connecting portion.

[0011] Optionally, the battery housing assembly further comprises an insulating sealing ring having a central hole, an inner periphery of the insulating sealing ring being sealingly connected with the eave portion, and an outer periphery of the insulating sealing ring being sealingly connected with the side wall.

[0012] Optionally, an inner side of the main side portion is provided with a protrusion, the protrusion being spaced apart from the curved portion to define a mounting groove, and the outer periphery of the insulating sealing ring is inserted into the mounting groove; and / or, the inner periphery of the insulating sealing ring is provided with an insertion slot, and the outer periphery of the eave portion is inserted into the insertion slot.

[0013] Optionally, in a direction of the main side portion towards the through hole, a slot opening of the insertion slot is arranged beyond the curved portion.

[0014] Optionally, the inner side portion at least partially extends into the central hole.

[0015] Optionally, the connecting portion abuts against the insulating sealing ring.

[0016] Optionally, the inner side portion abuts against the eave portion.

[0017] Optionally, the battery housing assembly further comprises:

[0018] An explosion-proof sheet arranged on a side of the end cover facing the bottom wall, an outer periphery of the explosion-proof sheet being connected with the eave portion and being inserted into the insertion slot together; and,

[0019] A hole plate arranged on a side of the explosion-proof sheet facing away from the end cover.

[0020] According to a second aspect of the present application, a battery is provided, comprising:

[0021] The battery housing assembly as described above; and,

[0022] An electric core accommodated in the shell.

[0023] The shell assembly of the battery of the embodiment of the application is characterized in that the terminal part is arranged in the through hole of the inner side part, and the outer side part is at least partially clamped between the sleeve and the bending part, so that the insulation plate can shield the deformation gap reserved between the terminal part and the sleeve, keep the battery appearance neat, prevent foreign matters from entering the gap and avoid causing short circuit. In addition, even if the electrolyte leaks out from between the eave part and the side wall, the insulation plate can block the electrolyte in the inner side, inhibit the electrolyte from leaking to the outside, and improve the safety of the battery. On this basis, by arranging the inner side part to be closer to the bottom wall relative to the outer side part, the insulation plate forms a space structure, the structural rigidity is increased, and the possibility of stress deformation is reduced. Even if the insulation plate has a tendency to be warped and deformed away from the bottom wall at the inner side part due to the shrinkage of the sleeve, the adverse effects can be offset by arranging the inner side part to be closer to the bottom wall relative to the outer side part, so that the sleeve does not completely cover the insulation plate due to deformation, thereby improving the yield of the sleeve, ensuring the appearance and insulation effect of the battery. That is, the insulation plate realizes the multiple effects of shielding the deformation gap, preventing foreign matters from entering, beautifying the appearance, improving the insulation effect, and inhibiting the electrolyte leakage by arranging the terminal part in the through hole of the inner side part and clamping the outer side part between the sleeve and the bending part. In addition, the inner side part is arranged to be closer to the bottom wall relative to the outer side part, the negative effects caused by deformation are reduced, the yield of the sleeve is improved, and the stable realization of various functions is ensured, thereby improving the production yield, appearance quality, safety and reliability of the battery.

[0024] Other features and advantages of the present application will be described in detail in the following detailed description section. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0027] Figure 1 is the first structure sectional view of the battery of the present disclosure;

[0028] Figure 2 is Figure 1 the structure schematic diagram at the end cover in the battery shown in the figure;

[0029] Figure 3 is the second structure sectional view of the battery of the present disclosure;

[0030] Figure 4 is Figure 3A structural schematic view of the structure at the end cover in the battery shown;

[0031] Figure 5 is a third structural sectional view of the battery of the present disclosure;

[0032] Figure 6 is Figure 5 A structural schematic view of the structure at the end cover in the battery shown;

[0033] Figure 7 is a structural plan view of the insulating plate of the battery of the present disclosure;

[0034] Figure 8 is Figure 7 A sectional view at A-A shown.

[0035] Explanation of reference signs:

[0036] 1000, battery; 100, shell assembly; 1, insulating plate; 11, inner side portion; 111, through hole; 12, connecting portion; 13, outer side portion; 2, shell; 21, bottom wall; 22, side wall; 221, main side portion; 2211, protrusion; 222, curved portion; 3, end cover; 31, terminal portion; 32, eave portion; 4, sleeve; 5, insulating sealing ring; 51, central hole; 6, explosion-proof sheet; 7, hole plate; 8, insulating gasket; 200, battery cell. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0038] The present application provides a shell assembly of a battery and a battery, please refer to Figure 1 and Figure 2 or Figure 3 and Figure 4 or Figure 5 and Figure 6 , Figures 1 to 8 A structural schematic view of the battery provided by the embodiments of the present application.

[0039] The shell assembly 100 of the battery 1000 includes a shell 2, an end cover 3, a sleeve 4, and an insulating plate 1.

[0040] The housing 2 has a bottom wall 21 and side walls 22. The side walls 22 include a main side portion 221 connected to the outer periphery of the bottom wall 21, and a curved portion 222 extending from one end of the main side portion 221 away from the bottom wall 21 toward the central axis of the housing 2. The housing 2 not only provides basic encapsulation and protection for the cell 200, but the curved portion 222 design also provides additional structural support and mounting positions. The electrode assembly of the cell 200 (including a positive electrode, a negative electrode, and a separator) undergoes an electrochemical reaction, and the housing 2 is electrically connected to either the positive or negative electrode to ensure current conduction.

[0041] The end cap 3 has a terminal portion 31 and an eave portion 32 connected to the outer periphery of the terminal portion 31. The eave portion 32 is located between the curved portion 222 and the bottom wall 21 and is insulated from the side wall 22. The terminal portion 31 on the end cap 3 is the electrical interface of the battery 1000 for connecting to external circuits, while the eave portion 32 is insulated from the side wall 22 to prevent short circuits.

[0042] Sleeve 4 covers the outside of housing 2. Sleeve 4, covering the outside of housing 2, not only enhances the appearance and feel of battery 1000, but also provides physical protection and additional insulation protection to prevent external damage.

[0043] See attached document for details. Figure 7 and Figure 8 The insulating plate 1 includes an inner portion 11, an outer portion 13 located around the inner portion 11, and a connecting portion 12 connecting the inner portion 11 and the outer portion 13. The outer portion 13 is at least partially sandwiched between the sleeve 4 and the bend 222. The inner portion 11 has a through hole 111 for the terminal portion 31 to pass through. The inner portion 11 is located closer to the bottom wall 21 than the outer portion 13 (i.e., in...). Figure 2 or Figure 4 or Figure 6 The inner part 11 is positioned lower, and the outer part 13 is positioned higher, with a height difference between them. The through hole 111 of the inner part 11 allows the terminal part 31 to pass through, while the outer part 13 is sandwiched between the sleeve 4 and the bent part 222, blocking deformation gaps, preventing foreign objects from entering, and effectively preventing electrolyte leakage, thus improving safety. The inner part 11 is positioned closer to the bottom wall 21. This design reduces the adverse effects caused by the shrinkage of the sleeve 4, ensures complete coverage of the sleeve 4, and improves the sleeve yield.

[0044] In the technical solution of the present application, the terminal portion 31 is arranged in the through hole 111 of the inner portion 11, and the outer portion 13 is at least partially clamped between the sleeve 4 and the curved portion 222, so that the insulation plate 1 can shield the deformation gap reserved between the terminal portion 31 and the sleeve 4, keep the appearance of the battery 1000 neat, prevent foreign matter from entering the gap and avoid causing short circuit. In addition, even if electrolyte leaks out between the eaves portion 32 and the side wall 22, the insulation plate 1 can block it on the inner side, inhibit the electrolyte from leaking to the outside, and improve the safety of the battery 1000. On this basis, by arranging the inner portion 11 closer to the bottom wall 21 relative to the outer portion 13, the insulation plate 1 forms a space structure, increases the structural rigidity, and reduces the possibility of stress deformation. Even if the insulation plate 1 has a tendency to warp away from the bottom wall 21 at the inner portion 11 due to the shrinkage of the sleeve 4 (see Figure 2 or Figure 4 or Figure 6 It is understood that the sleeve 4 is pressed on the upper side of the outer portion 13, and the shrinkage of the sleeve 4 can cause the inner portion 11 to deform and warp upward. The arrangement of the inner portion 11 closer to the bottom wall 21 relative to the outer portion 13 can offset the adverse effects and avoid the deformation of the sleeve 4 from covering the insulation plate 1 incompletely, thereby improving the yield of the sleeve and ensuring the appearance and insulation effect of the battery 1000. That is, the insulation plate 1 realizes the multiple effects of shielding the deformation gap, preventing foreign matter from entering, beautifying the appearance, improving the insulation effect, and inhibiting electrolyte leakage by arranging the terminal portion 31 in the through hole 111 of the inner portion 11 and clamping the outer portion 13 between the sleeve 4 and the curved portion 222. The arrangement of the inner portion 11 closer to the bottom wall 21 relative to the outer portion 13 reduces the negative effects of deformation, improves the yield of the sleeve, and ensures the stable implementation of various functions, thereby improving the production yield, appearance quality, safety, and reliability of the battery 1000.

[0045] It can be understood that the inner portion 11 is arranged closer to the bottom wall 21 relative to the outer portion 13, that is, the connecting portion 12 is connected between the inner portion 11 and the outer portion 13 at a right angle.

[0046] In some embodiments, see Figure 8 , the connecting portion 12 is arranged obliquely, and in the radial direction of the through hole 111, the inner periphery of the connecting portion 12 is arranged closer to the through hole 111 relative to the outer periphery of the connecting portion 12. In these embodiments, the oblique design of the connecting portion 12 forms an obtuse angle connection, provides additional lateral support, enhances the structural rigidity of the insulation plate 1, effectively disperses stress, reduces stress deformation, further reduces the negative effects of deformation, improves the yield of the sleeve, and ensures the stable implementation of various functions.

[0047] It can be understood that there are various ways to achieve the insulating connection between the eave part 32 and the side wall 22, such as coating an insulating layer on the contact surface of the eave part 32 and / or the side wall 22.

[0048] In some embodiments, see Figure 2 or Figure 4 or Figure 6 The housing assembly 100 of the battery 1000 further comprises an insulating sealing ring 5 having a central hole 51, the inner periphery of the insulating sealing ring 5 being sealingly connected with the eave part 32, and the outer periphery of the insulating sealing ring 5 being sealingly connected with the side wall 22. In these embodiments, the insulating sealing ring 5 not only provides electrical insulation, but also has good sealing performance to prevent electrolyte leakage. Moreover, as an independent sealing element, the insulating sealing ring 5 can simplify the assembly process and improve production efficiency. Specifically, the insulating sealing ring 5 is made of high-performance insulating materials, such as specific types of rubber or synthetic materials.

[0049] In some embodiments, see Figure 2 or Figure 4 or Figure 6 The inner side of the main side part 221 is provided with a protrusion 2211, which is arranged in a spaced manner with the curved part 222 to define a mounting groove, and the outer periphery of the insulating sealing ring 5 is inserted into the mounting groove. In these embodiments, the mounting groove provides conditions for precise positioning and stable installation of the insulating sealing ring 5, and the outer periphery of the insulating sealing ring 5 is precisely inserted into this mounting groove, which not only ensures the correct installation position of the sealing ring, but also effectively improves its fixation and sealing performance. Through the cooperation between the protrusion 2211 and the curved part 222, the side wall 22 can tightly engage the outer periphery of the insulating sealing ring 5 to prevent it from shifting or loosening during operation, thereby ensuring the dual effects of electrical insulation and mechanical sealing and strengthening stability and safety.

[0050] In some embodiments, see Figure 2 or Figure 4 or Figure 6 The inner periphery of the insulating sealing ring 5 is provided with a slot, and the outer periphery of the eave part 32 is inserted into the slot. In these embodiments, the slot can ensure more accurate alignment and fixation of the insulating sealing ring 5 during installation, thereby improving the sealing performance and mechanical stability of the entire battery 1000 structure, and also reducing the potential risk of poor contact or short circuit caused by improper installation, thereby improving the safety of the battery 1000.

[0051] In some embodiments, see Figure 2 or Figure 4 or Figure 6In the direction of the main side 221 towards the through hole 111, the slot of the slot is arranged beyond the bending part 222. In these embodiments, in the direction of the main side 221 towards the through hole 111, the slot of the slot is arranged beyond the bending part 222 means that part of the structure of the insulating sealing ring 5 is not completely covered beyond the edge of the bending part 222, the exceeding part can provide additional constraint, can form close contact and stable connection with the eave part 32 and the bending part 222, ensure the fixing and sealing effect of the insulating sealing ring 5, also provide additional barrier to avoid short circuit between the bending part 222 and the eave part 32 or the terminal part 31, enhance the insulation effect, thereby improve the structural stability, safety and reliability of the battery 1000.

[0052] It can be understood that the electrolyte is sealed in the shell 2, if the sealing effect of the insulating sealing ring 5 between the eave part 32 and the side wall 22 is not good, the electrolyte will flow out along the insulating sealing ring 5 between the eave part 32 and / or the bending part 222, due to the blockage of the insulating plate 1, the leakage of the electrolyte outside the battery 1000 can be inhibited.

[0053] In some embodiments, see Figure 4 or Figure 6 The inner side 11 at least partially extends into the center hole 51. In these embodiments, the inner side 11 of the insulating plate 1 at least partially extends into the center hole 51 of the insulating sealing ring 5, which can more directly form an effective barrier on the potential outflow path of the electrolyte, by physically occupying part of the space of the center hole 51, it can cooperate with the structure depth of the insulating sealing ring 5 to form a multiple sealing barrier, which can effectively prevent the overflow of the electrolyte, and ensure the safety and performance stability of the battery 1000 under various working conditions.

[0054] In some embodiments, see Figure 4 The connecting part 12 abuts against the insulating sealing ring 5. In these embodiments, the connecting part 12 abuts against the insulating sealing ring 5, which provides a stable fixing point for the insulating plate 1, enhances its stability and anti-deformation ability, avoids performance degradation due to displacement or deformation, at the same time, this connection mode more effectively cuts off the electrolyte flow path between the insulating sealing ring 5 and the bending part 222, reduces the risk of electrolyte leakage, thereby improving the safety and reliability of the battery 1000.

[0055] In some embodiments, see Figure 6, the inner side portion 11 abuts against the eave portion 32. In these embodiments, the direct contact between the inner side portion 11 and the eave portion 32 provides an additional fixed support point for the insulation plate 1, enhancing the stability and anti-deformation ability of the insulation plate 1, avoiding performance degradation caused by displacement or deformation, and the design of the abutment of the inner side portion 11 against the eave portion 32 can effectively cut off the electrolyte flow path between the insulation sealing ring 5 and the bending portion 222 and between the insulation sealing ring 5 and the eave portion 32, enhancing the sealing performance of the battery 1000, reducing the risk of electrolyte leakage, and thus improving the safety and reliability of the battery 1000.

[0056] In some embodiments, see Figure 2 or Figure 4 or Figure 6 , the housing assembly 100 of the battery 1000 further comprises a rupture disc 6 and a hole plate 7, the rupture disc 6 is arranged on the side of the end cover 3 facing the bottom wall 21, the outer periphery of the rupture disc 6 is connected with the eave portion 32 and is inserted into the insertion slot together; the hole plate 7 is arranged on the side of the rupture disc 6 away from the end cover 3. In these embodiments, the outer periphery of the rupture disc 6 is connected with the eave portion 32 of the end cover 3 and is inserted into the insertion slot of the insulation sealing ring 5, increasing the structural strength, stability and sealing performance of the entire assembly, when the internal pressure of the battery 1000 abnormally increases (such as overcharging or thermal runaway), the rupture disc 6 can be deformed or ruptured, thereby releasing the pressure accumulated inside the battery 1000, preventing more serious explosion accidents of the battery 1000, the hole plate 7 works with the rupture disc 6, the design of the pores on the hole plate 7 allows gas or other substances to pass through to ensure that the pressure inside the battery 1000 can be effectively released, improving the safety of the battery 1000.

[0057] In some embodiments, see Figure 2 or Figure 4 or Figure 6 , the middle region of the hole plate 7 and the middle region of the rupture disc 6 are connected, and the outer periphery of the hole plate 7 and the outer periphery of the rupture disc 6 are arranged in a spaced manner and are insulated by the insulating gasket 8. In these embodiments, by arranging the insulating gasket 8, the short-circuit connection between the hole plate 7 and the rupture disc 6 in the non-connection region is avoided, which affects the short-circuit test and extrusion test of the battery 1000, thereby ensuring the performance of the battery 1000.

[0058] According to a second aspect of the present application, a battery 1000 is provided, comprising a housing assembly 100 and an electric core 200, the structure of the housing assembly 100 is as described above, and the electric core 200 is accommodated in the shell 2 of the housing assembly 100. Since the battery 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0059] In the description of the application, the terms "first", "second", "third" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0060] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0061] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0062] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment in accordance with the technical essence of the present application without departing from the technical solution content of the present application still falls within the scope of the technical solution of the present application.

Claims

1. A housing assembly for a battery, characterized by The battery shell assembly comprises: a shell having a bottom wall and a side wall, the side wall comprising a main side connected to an outer periphery of the bottom wall, and a curved portion extending from one end of the main side away from the bottom wall to a central axis of the shell; an end cover having a terminal portion and a eave portion connected to an outer periphery of the terminal portion, the eave portion being located between the curved portion and the bottom wall and being insulatedly connected with the side wall; a sleeve covering the shell; and an insulation plate comprising an inner side, an outer side provided at a periphery of the inner side, and a connecting portion connected between the inner side and the outer side, the outer side being at least partially sandwiched between the sleeve and the curved portion, the inner side being provided with a through hole for penetrating the terminal portion, and the inner side being arranged closer to the bottom wall than the outer side.

2. The battery case assembly according to claim 1, wherein The connecting portion is arranged obliquely, and in a radial direction of the through hole, an inner periphery of the connecting portion is arranged closer to the through hole than an outer periphery of the connecting portion.

3. The battery case assembly according to claim 1 or 2, wherein The battery shell assembly further comprises an insulation sealing ring having a central hole, an inner periphery of the insulation sealing ring being sealingly connected with the eave portion, and an outer periphery of the insulation sealing ring being sealingly connected with the side wall.

4. The battery case assembly according to claim 3, wherein An inner side of the main side is provided with a protrusion, the protrusion being arranged spaced apart from the curved portion to define a mounting groove, and an outer periphery of the insulation sealing ring being inserted into the mounting groove; and / or An inner periphery of the insulation sealing ring is provided with an insertion slot, and an outer periphery of the eave portion is inserted into the insertion slot.

5. The battery case assembly according to claim 4, wherein In a direction of the main side towards the through hole, a slot opening of the insertion slot is arranged beyond the curved portion.

6. The battery case assembly according to claim 5, wherein The inner side of the insulation plate at least partially extends into the central hole.

7. The battery case assembly according to claim 6, wherein The connecting portion abuts against the insulation sealing ring.

8. The battery case assembly according to claim 6, wherein The inner side of the insulation plate abuts against the eave portion.

9. The battery enclosure assembly of any one of claims 4 to 8, wherein, The battery shell assembly further comprises: a rupture disc arranged at a side of the end cover facing the bottom wall, an outer periphery of the rupture disc being connected with the eave portion and being jointly inserted into the insertion slot; and a hole plate arranged at a side of the rupture disc facing away from the end cover.

10. A battery, characterized by The battery shell assembly comprises: the battery shell assembly according to any one of claims 1 to 9; and a battery cell accommodated in the shell.

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