Protective shell assembly and single battery

Abstract

The utility model discloses a protective shell assembly and a single battery, and belongs to the technical field of batteries. The protective shell assembly comprises a shell, a containing cavity is formed in the shell, an electrode assembly is installed in the containing cavity, a first tab through hole is formed in the top wall of the shell, and the first tab through hole communicates with the containing cavity; the plastic part comprises a first plastic part with a second tab through hole, the first plastic part is arranged on the outer side of the top wall, and the second tab through hole is opposite to the first tab through hole; the connecting piece is arranged on the side, away from the shell, of the first plastic part, the connecting piece is bonded with the first plastic part, and the electrode lug of the electrode assembly located in the containing cavity can sequentially penetrate through the first electrode lug through hole and the second electrode lug through hole and is electrically connected with the connecting piece. According to the utility model, the utilization rate of the internal space of the battery shell can be improved, and the energy density of the power supply module can be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a protection shell subassembly and monomer battery. BACKGROUND

[0002] With the rapid development of new energy vehicles, electric vehicles and electric tools and each field, the power supply module for providing stable power supply has been widely applied.

[0003] In the prior art, the shell assembly of the monomer battery comprises a cover plate and a protective shell with an assembly opening, the electrode assembly is placed into the protective shell from the assembly opening, and then the cover plate is covered on the protective shell to ensure the sealing assembly. The pole column bottom on the cover plate is located in the protective shell, and the tab of the electrode assembly is electrically connected with the pole column bottom through the connecting piece.

[0004] Since the connecting piece and the pole column bottom are both located in the protective shell, it is not conducive to improving the utilization rate of the internal space of the battery shell.

[0005] Therefore, it is urgent to provide a protective shell subassembly and monomer battery to solve the above problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a protective shell subassembly and monomer battery, which can improve the utilization rate of the internal space of the battery shell and help to increase the energy density of the power supply module.

[0007] To achieve the above purpose, the following technical scheme is provided:

[0008] The protective shell subassembly comprises:

[0009] The shell is internally provided with a containing cavity, the containing cavity is used for installing the electrode assembly, the top wall of the shell is provided with a first tab through hole, and the first tab through hole is communicated with the containing cavity;

[0010] The plastic part comprises a first plastic part provided with a second tab through hole, the first plastic part is arranged on the outer side of the top wall, and the second tab through hole is arranged opposite to the first tab through hole;

[0011] The connecting piece is arranged on the side of the first plastic part away from the shell, the connecting piece is bonded with the first plastic part, and the tab of the electrode assembly located in the containing cavity can pass through the first tab through hole and the second tab through hole in sequence and be electrically connected with the connecting piece.

[0012] As an optional scheme of the protective shell subassembly, at least one positioning groove is arranged on the end face of the first plastic part away from the shell, and the connecting piece is bonded in the positioning groove.

[0013] As an optional solution of the protective shell assembly, a flange is arranged on the outer edge of the first plastic part in a circumferential direction, and the flange is in abutment with the top wall.

[0014] As an optional solution of the protective shell assembly, the plastic part further comprises a second plastic part, a third tab through hole is arranged on the second plastic part, the second plastic part is arranged on the inner side of the top wall, and the tab can pass through the third tab through hole, the first tab through hole and the second tab through hole in sequence and be electrically connected with the connecting sheet.

[0015] As an optional solution of the protective shell assembly, the plastic part further comprises an intermediate connecting sleeve, the first plastic part, the intermediate connecting sleeve and the second plastic part are in an integrated structure, and the second tab through hole of the first plastic part and the third tab through hole of the second plastic part are communicated with each other through the intermediate connecting sleeve.

[0016] As an optional solution of the protective shell assembly, a mounting groove is arranged on the top wall, the first tab through hole penetrates the groove bottom of the mounting groove, the first plastic part is located in the mounting groove, and the intermediate connecting sleeve is arranged in the first tab through hole.

[0017] As an optional solution of the protective shell assembly, the protective shell assembly further comprises an explosion valve protection film, an explosion valve is arranged on the top wall, and the explosion valve protection film is arranged on the explosion valve.

[0018] As an optional solution of the protective shell assembly, a plurality of air holes are arranged on the second plastic part, and each air hole is arranged opposite to the explosion valve.

[0019] As an optional solution of the protective shell assembly, a liquid injection port is arranged on the top wall, a liquid adding through hole is arranged on the second plastic part, and the liquid injection port and the liquid adding through hole are arranged opposite to each other and are in communication.

[0020] A single battery comprises an electrode assembly and the above-mentioned protective shell assembly, and the electrode assembly is arranged in the shell of the protective shell assembly.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] The protective shell assembly provided by the utility model is provided with a first tab through hole on the top wall of the shell, the first plastic part of the plastic part is arranged outside the top wall, the connecting piece made of conductive material is installed to the side of the first plastic part away from the shell, the connecting piece and the first plastic part are mutually bonded in a matching mode, the connection stability of the connecting piece and the first plastic part is ensured, and the assembly difficulty of the connecting piece and the first plastic part is reduced.

[0023] The single battery provided by the utility model is characterized in that the tab of the electrode assembly in the shell is electrically connected to the connecting piece by penetrating the top wall and the first plastic part of the shell and being bent, the utilization rate of the internal space of the shell of the battery can be improved, and the energy density of the power supply module can be increased. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by those skilled in the art without creative labor.

[0025] Figure 1 It is the assembly schematic view of the first perspective of the protective shell assembly in the embodiments of the utility model;

[0026] Figure 2 It is the explosion schematic view of the protective shell assembly in the embodiments of the utility model;

[0027] Figure 3 It is the assembly schematic view of the second perspective of the protective shell assembly in the embodiments of the utility model; Figure 2

[0028] Figure 4 It is the assembly schematic view of the second perspective of the protective shell assembly in the embodiments of the utility model;

[0029] Figure 5 It is the explosion schematic view of the plastic part in the embodiments of the utility model;

[0030] Figure 6 It is the sectional view of the protective shell assembly in the embodiments of the utility model;

[0031] Figure 7 It is the assembly schematic view of the second perspective of the protective shell assembly in the embodiments of the utility model; Figure 6 ​​

[0032] Figure 8 For Figure 6 A local enlarged view at C;

[0033] Figure 9 For Figure 6 A sectional view taken along D-D.

[0034] Reference signs:

[0035] 1, shell; 2, plastic part; 3, connecting piece; 4, explosion-proof valve protection film;

[0036] 11, accommodating cavity; 12, top wall; 121, first tab through hole; 122, mounting groove; 123, explosion-proof valve; 124, liquid injection port;

[0037] 21, first plastic part; 211, second tab through hole; 212, positioning groove; 213, flange edge; 22, second plastic part; 221, third tab through hole; 222, air hole; 223, liquid injection through hole; 23, intermediate connecting sleeve. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the utility model, still need to explain, unless another explicit provision and limitation, term "arrangement", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection. For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0041] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0042] In order to improve the utilization rate of the internal space of the battery shell, and increase the energy density of the power supply module, the embodiment provides a protective shell assembly and a single battery, which are described below Figures 1 to 9 The specific content of the embodiment is described in detail.

[0043] As Figures 1 to 5 shown, the protective shell assembly in the embodiment includes a shell 1, a plastic part 2 and a connecting sheet 3. The shell 1 is provided with a receiving cavity 11, and the receiving cavity 11 is used to install an electrode assembly. The top wall 12 of the shell 1 is provided with a first tab through hole 121, and the first tab through hole 121 is in communication with the receiving cavity 11. The plastic part 2 includes a first plastic part 21 provided with a second tab through hole 211, and the first plastic part 21 is arranged on the outer side of the top wall 12. The second tab through hole 211 is arranged opposite to the first tab through hole 121. The connecting sheet 3 is arranged on the side of the first plastic part 21 away from the shell 1, and the connecting sheet 3 is bonded to the first plastic part 21. The tab of the electrode assembly arranged in the receiving cavity 11 can pass through the first tab through hole 121 and the second tab through hole 211 in sequence and be electrically connected to the connecting sheet 3. Exemplarily, the shell 1 and the connecting sheet 3 can both be made of metal. The performance of the adhesive used for bonding: resistant to electrolyte, with a certain bonding strength, the bonding strength is greater than or equal to 0.5 Mpa, and the main components of the adhesive include polyolefin resin and polyisobutylene rubber, etc.

[0044] In short, the protective shell assembly provided by the present invention is provided with a first tab through-hole 121 on the top wall 12 of the shell 1, the first plastic part 21 of the plastic part 2 is arranged on the outside of the top wall 12, and the connecting piece 3 made of a conductive material is installed on the side of the first plastic part 21 away from the shell 1. The connecting piece 3 and the first plastic part 21 are bonded to each other, thereby ensuring the stability of the connection between the connecting piece 3 and the first plastic part 21 and reducing the difficulty of assembling the connecting piece 3 and the first plastic part 21. Because the second tab through-hole 211 of the first plastic part 21 is arranged opposite to the first tab through-hole 121 of the shell 1, the tabs of the electrode assembly located in the accommodating cavity 11 of the shell 1 can pass through the first tab through-hole 121 and the second tab through-hole 211 in sequence and be bent to be electrically connected to the connecting piece 3. By arranging the connecting piece 3 on the outside of the shell 1, not only can the utilization rate of the internal space of the battery shell 1 be improved, but it also helps to increase the energy density of the power supply module.

[0045] Furthermore, if Figures 2 to 9 As shown, the end surface of the first plastic component 21 facing away from the housing 1 is provided with at least one positioning groove 212, into which the connecting piece 3 is bonded. The addition of the positioning groove 212 allows for the addition of glue to effectively secure the connecting piece 3. Furthermore, the positioning groove 212 can contain the glue, preventing it from flowing freely before solidifying. When the thickness of the top wall 12 of the housing 1 is H, the distance L1 between the surface of the first plastic component 21 and the upper surface of the housing 1 is between -1H and 0.5H (a negative distance indicates that it extends beyond the surface of the housing 1).

[0046] Furthermore, a flange 213 is provided around the outer edge of the first plastic part 21, contacting the top wall 12. The addition of the flange 213 further increases the contact area between the first plastic part 21 and the housing 1. For example, the width L2 of the flange 213 is 1 mm to 10 mm.

[0047] Furthermore, the plastic part 2 also includes a second plastic part 22, which is provided with a third tab through-hole 221. The second plastic part 22 is disposed on the inner side of the top wall 12. The tab can sequentially pass through the third tab through-hole 221, the first tab through-hole 121, and the second tab through-hole 211 and be electrically connected to the connecting piece 3. In this embodiment, the first plastic part 21 and the second plastic part 22 can be split. By installing the second plastic part 22 between the electrode assembly and the top wall 12 of the housing 1, the electrode assembly and the housing 1 are isolated from direct contact, thereby avoiding the risk of electrical conduction of the housing 1.

[0048] In some application scenarios, the first plastic part 21 and the second plastic part 22 in the plastic part 2 in the embodiment can also be integrated. The plastic part 2 further comprises an intermediate connecting sleeve 23, the first plastic part 21, the intermediate connecting sleeve 23 and the second plastic part 22 are integrated structures, and the second tab through hole 211 of the first plastic part 21 and the third tab through hole 221 of the second plastic part 22 are in communication with each other through the intermediate connecting sleeve 23. The intermediate connecting sleeve 23 is located in the first tab through hole 121, and the tabs of the electrode assembly are electrically connected with the connecting piece 3 after passing through the third tab through hole 221, the intermediate connecting sleeve 23 and the second tab through hole 211 in sequence.

[0049] Further, the top wall 12 is provided with a mounting groove 122, the first tab through hole 121 penetrates the groove bottom of the mounting groove 122, the first plastic part 21 is located in the mounting groove 122, and the intermediate connecting sleeve 23 is arranged in the first tab through hole 121. By adding the mounting groove 122, the first plastic part 21 can be accommodated outside the top wall of the shell 1.

[0050] Further, the protective shell assembly further comprises an explosion-proof valve protection film 4, the top wall 12 is provided with an explosion-proof valve 123, and the explosion-proof valve protection film 4 is arranged on the explosion-proof valve 123. By adding the explosion-proof valve 123 and the explosion-proof valve protection film 4, when high-pressure gas is generated in the shell 1 of the power supply module due to a fault, the high-pressure gas can be quickly discharged. Optionally, the notch on the explosion-proof valve 123 can face the inside of the shell 1 or the outside of the shell 1.

[0051] Further, a plurality of air holes 222 are arranged on the second plastic part 22, and each air hole 222 is arranged opposite to the explosion-proof valve 123. By arranging a plurality of air holes 222 on the second plastic part 22, the discharge of high-pressure gas is facilitated, and the problem that the explosion-proof valve 123 cannot work due to the addition of the second plastic part 22 is avoided.

[0052] Further, the top wall 12 is provided with a liquid injection port 124, the second plastic part 22 is provided with a liquid adding through hole 223, and the liquid injection port 124 and the liquid adding through hole 223 are arranged opposite to and in communication with each other. By adding the liquid injection port 124, electrolyte can be added to the protective shell assembly. The electrolyte can transfer ions between the positive and negative electrodes of the battery, thereby ensuring that the battery can work normally. Optionally, the liquid injection port 124 can be arranged near the positive electrode side of the shell 1, or near the negative electrode side of the shell 1 or between the positive and negative electrodes, which is not limited here.

[0053] The embodiment further provides a single battery, which comprises an electrode assembly and the above-mentioned protective shell assembly, and the electrode assembly is arranged in the shell 1 of the protective shell assembly. The tabs of the electrode assembly located in the shell 1 are electrically connected with the connecting piece 3 after passing through the top wall 12 of the shell 1 and the first plastic part 21 and being bent, which not only can improve the utilization rate of the internal space of the battery shell 1, but also can help to increase the energy density of the power supply module.

[0054] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific examples described herein, those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. A protective shell assembly, characterized in that: include: A housing (1) is provided with a housing cavity (11) therein, wherein the housing cavity (11) is used to install an electrode assembly, and a first tab through hole (121) is provided on a top wall (12) of the housing (1), wherein the first tab through hole (121) is in communication with the housing cavity (11); A plastic part (2) comprising a first plastic part (21) having a second tab through hole (211), wherein the first plastic part (21) is arranged on the outside of the top wall (12), and the second tab through hole (211) is arranged opposite to the first tab through hole (121); A connecting piece (3) is provided on a side of the first plastic part (21) away from the housing (1); the connecting piece (3) is bonded to the first plastic part (21); and the tabs of the electrode assembly located in the accommodating cavity (11) can pass through the first tab through-hole (121) and the second tab through-hole (211) in sequence and be electrically connected to the connecting piece (3).

2. The protective shell assembly according to claim 1, characterized in that At least one positioning groove (212) is provided on an end surface of the first plastic part (21) away from the housing (1), and the connecting piece (3) is bonded into the positioning groove (212).

3. The protective shell assembly according to claim 1, wherein: A flange edge (213) is provided on the circumference of the outer edge of the first plastic part (21), and the flange edge (213) abuts against the top wall (12).

4. The protective shell assembly according to claim 1, wherein: The plastic part (2) further includes a second plastic part (22), the second plastic part (22) being provided with a third pole lug through hole (221), the second plastic part (22) being arranged on the inner side of the top wall (12), and the pole lug being capable of sequentially passing through the third pole lug through hole (221), the first pole lug through hole (121) and the second pole lug through hole (211) and being electrically connected to the connecting piece (3).

5. The protective shell assembly according to claim 4, characterized in that The plastic part (2) further includes an intermediate connecting sleeve (23); the first plastic part (21), the intermediate connecting sleeve (23) and the second plastic part (22) are an integrated structure; the second tab through hole (211) of the first plastic part (21) and the third tab through hole (221) of the second plastic part (22) are connected to each other via the intermediate connecting sleeve (23).

6. The protective shell assembly according to claim 5, characterized in that The top wall (12) is provided with a mounting groove (122), the first tab through hole (121) passes through the bottom of the mounting groove (122), the first plastic part (21) is located in the mounting groove (122), and the intermediate connecting sleeve (23) is passed through the first tab through hole (121).

7. The protective shell assembly according to claim 4, characterized in that The protective shell assembly further comprises an explosion-proof valve protective film (4), an explosion-proof valve (123) is provided on the top wall (12), and the explosion-proof valve protective film (4) is covered on the explosion-proof valve (123).

8. The protective shell assembly according to claim 7, wherein: The second plastic part (22) is provided with a plurality of air holes (222), and each of the air holes (222) is arranged opposite to the explosion-proof valve (123).

9. The protective shell assembly according to claim 4, wherein: The top wall (12) is provided with a liquid injection port (124), and the second plastic part (22) is provided with a liquid adding through hole (223). The liquid injection port (124) and the liquid adding through hole (223) are arranged opposite to each other and are in communication.

10. A single cell battery, characterized in that: It comprises an electrode assembly and a protective shell assembly according to any one of claims 1 to 9, wherein the electrode assembly is arranged in a shell (1) of the protective shell assembly.

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