Shell assembly and battery

Abstract

The utility model belongs to the technical field of electric energy storage, and discloses a shell assembly and a battery. The shell assembly comprises a shell body, a fixing piece and a connecting piece. A through hole is formed in the top of the shell body; the fixing piece comprises a first fixing part and a second fixing part, the first fixing part is arranged on the outward wall surface of the shell body, the second fixing part is arranged in the shell body, and a shaping structure is arranged on the second fixing part; the connecting piece is arranged on the first fixing part, and the connecting piece is fixed on the first fixing part through bonding; and a part of structure of the tab located in the shell body can be bent towards the direction close to the connecting piece through extrusion of the shaping structure and penetrates through the through hole to be electrically connected with the connecting piece. According to the utility model, the space utilization rate in the battery can be improved, in addition, the folding form of the tabs can be ensured, the short circuit of the battery is avoided, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric energy storage, in particular to a shell component and a battery. Background Art

[0002] In energy storage systems, batteries as an energy device have been widely used in mobile phones, electric vehicles, and power tools.

[0003] Please see the attached Figure 1 -Attached Figure 4 The prior art provides a battery comprising a positive electrode assembly 10 and a negative electrode assembly 20, wherein the positive electrode assembly 10 comprises a positive electrode connector 11 and a positive electrode tab 12, and the negative electrode assembly 20 comprises a negative electrode connector 21 and a negative electrode tab 22. The positive electrode connector 11, the positive electrode tab 12, the negative electrode connector 21, and the negative electrode tab 22 are all located within a battery housing 30, with the positive electrode connector 11 electrically connected to the positive electrode tab 12, and the negative electrode connector 21 electrically connected to the negative electrode tab 22. A first plastic component 32 located outside a cover plate 31 of the housing 30 and a second plastic component 33 located inside the cover plate 31 are used to provide sealing and insulation for the battery's electrical connection structure.

[0004] Since the entire structure of the connecting plate and the tabs of traditional batteries are arranged inside the battery, the internal space utilization of the battery is reduced; and the shape of the tabs after being folded is poor, which can easily cause short circuit problems. Utility Model Content

[0005] The purpose of the utility model is to provide a shell assembly and a battery, which are used to improve the space utilization inside the battery and avoid battery short circuit caused by poor terminal ear shape.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Housing assembly, comprising:

[0008] A shell body, wherein a through hole is provided on the top of the shell body;

[0009] A fixing member, the fixing member comprising a first fixing portion and a second fixing portion, the first fixing portion being disposed on an outwardly facing wall of the shell body, the second fixing portion being disposed inside the shell body, and the second fixing portion being provided with a shaping structure;

[0010] a connecting piece, provided on the first fixing portion, wherein the connecting piece is fixed to the first fixing portion by bonding;

[0011] A portion of the structure of the tab located inside the shell body can be bent toward the connecting piece by the extrusion of the shaping structure and pass through the through hole to be electrically connected to the connecting piece.

[0012] As an optional solution of the housing assembly, a receiving groove is provided on the first fixing portion, and the connecting piece is provided in the receiving groove.

[0013] As an optional solution of the shell assembly, the first fixing portion is provided with lead-out holes on both sides of the accommodating groove, the lead-out holes are arranged opposite to the through hole, and the tab passes through the through hole and out from the lead-out holes.

[0014] As an optional solution for a shell assembly, the distance from the bottom wall of the accommodating groove to the top wall of the shell body is β, the thickness of the top wall of the shell body is λ, λ is 1.2mm~1.8mm, when the bottom wall of the accommodating groove is higher than the top wall of the shell body, β is not greater than λ; when the bottom wall of the accommodating groove is lower than the top wall of the shell body, β is not greater than 0.5λ.

[0015] As an optional solution for a shell assembly, an opening is provided on the second fixing portion at a position relative to the through hole, and the shaping structure includes guiding inclined surfaces respectively provided on both sides of the opening, and the tab can be retracted toward the opening through the guiding and extruding action of the guiding inclined surfaces.

[0016] As an optional solution of the housing assembly, the tab passes through the opening and the through hole in sequence.

[0017] As an optional solution for a shell assembly, a mounting hole is provided on the shell body, and the shell assembly also includes an explosion-proof valve, which is arranged in the mounting hole. The explosion-proof valve is provided with a notch for pressure relief, and the notch is provided on the side of the explosion-proof valve facing the interior of the shell body or on the side of the explosion-proof valve away from the interior of the shell body.

[0018] As an optional solution for the shell assembly, the shell body is provided with a limiting groove, and a limiting structure is provided around the first fixing portion, and the limiting structure cooperates with the limiting groove to achieve positioning of the first fixing portion relative to the shell body.

[0019] As an optional solution of the housing assembly, the first fixing portion and the second fixing portion are an integrated structure or a split structure.

[0020] A battery includes a battery cell and also includes the shell assembly and the tab described in any of the above solutions, and the battery cell is arranged inside the shell body.

[0021] Beneficial effects:

[0022] In the first aspect of the present invention, the housing assembly secures the connecting tab and a portion of the tab structure to the exterior of the housing body, avoiding the prior art approach of placing them internally. This improves space utilization within the battery and utilizes an adhesive bonding method for simplified operation. Furthermore, during the tab extension process, the shaping structure located in the second fixing portion bends and folds the tab toward the connecting tab, ensuring a collapsed tab configuration, preventing battery short circuits and improving safety.

[0023] In the second aspect of the present invention, the battery based on the shell assembly can effectively improve the space utilization inside the battery, and has a good retraction effect for the assembly of the tabs, which can effectively avoid battery short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of a battery provided by the prior art;

[0025] Figure 2 This is an axonometric diagram of the assembly of the first plastic part, the second plastic part, and the cover plate of a battery provided by the prior art;

[0026] Figure 3 This is a top view of the assembly of the first plastic part, the second plastic part, and the cover plate of a battery provided by the prior art;

[0027] Figure 4 This is a cross-sectional view of the assembly of the first plastic part, the second plastic part, and the cover plate of a battery provided by the prior art;

[0028] Figure 5 This is an exploded view from a first perspective of a housing assembly provided by an embodiment of the present utility model;

[0029] Figure 6 This is a first-perspective axonometric view of a housing assembly provided by an embodiment of the present invention;

[0030] Figure 7 This is an exploded view from a second perspective of the housing assembly provided by an embodiment of the present utility model;

[0031] Figure 8 This is a second perspective axonometric view of the housing assembly provided by an embodiment of the present utility model;

[0032] Figure 9 This is a schematic diagram of the exploded structure of the fixing member provided in an embodiment of the present utility model;

[0033] Figure 10 is a top view of a housing assembly provided by an embodiment of the present utility model;

[0034] Figure 11 yes Figure 10 Cross-sectional view at section AA;

[0035] Figure 12 yes Figure 11 A partial enlarged view at point C;

[0036] Figure 13 yes Figure 11 A local enlarged view at point D;

[0037] Figure 14 yes Figure 11 Cross-sectional view at section BB;

[0038] Figure 15 yes Figure 14 A partial enlarged view at point E.

[0039] In the picture:

[0040] 10. Positive electrode assembly; 11. Positive electrode connecting piece; 12. Positive electrode tab; 20. Negative electrode assembly; 21. Negative electrode connecting piece; 22. Negative electrode tab; 30. Housing; 31. Cover; 32. First plastic part; 33. Second plastic part;

[0041] 100, housing body; 110, upper cover; 111, through hole; 112, mounting hole; 113, limiting groove; 114, injection hole;

[0042] 200, fixing member; 210, first fixing portion; 211, receiving groove; 212, lead-out hole; 213, limiting structure; 220, second fixing portion; 221, opening; 230, shaping structure; 231, guiding slope;

[0043] 300, connecting piece;

[0044] 400. Explosion-proof valve. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0046] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0049] Please see the attached Figure 5 -Attached Figure 9 The first aspect of this embodiment relates to a shell assembly, which is used to cover the battery cells to assemble into a battery to provide insulation and protection.

[0050] The housing assembly includes a housing body 100, a fixing member 200, and a connecting piece 300. A through-hole 111 is provided at the top of the housing body 100. The fixing member 200 includes a first fixing portion 210 and a second fixing portion 220. The first fixing portion 210 is provided on the outward-facing wall of the housing body 100, and the second fixing portion 220 is provided inside the housing body 100. A shaping structure 230 is provided on the second fixing portion 220. The connecting piece 300 is provided on the first fixing portion 210 and is fixed to the first fixing portion 210 by bonding. Part of the structure of the tab located inside the housing body 100 can be bent toward the connecting piece 300 by the extrusion of the shaping structure 230 and pass through the through-hole 111 to be electrically connected to the connecting piece 300.

[0051] In this embodiment, the housing body 100 is an overall rectangular parallelepiped structure. The housing body 100 includes an outer shell that wraps around the rectangular battery on all four sides and an upper cover 110 located on top of the outer shell. It is understood that the housing body 100 can be an integral structure or a split structure, that is, the upper cover 110 is directly formed with the outer shell of the housing body 100 using an integral molding process, or the upper cover 110 is a separate part fixed to the outer shell of the housing body 100 by snap-fitting or bonding. When the housing body 100 is a split structure, the upper cover 110 is a polished aluminum plate. The aluminum material can ensure strength while reducing weight. In addition, the battery cell is arranged in the housing body 100 and then undergoes a complete packaging process to form a rectangular parallelepiped battery. The upper cover 110 is provided with an elongated through hole 111. The through hole 111 can be used to pass through the tab located inside the housing body 100. Therefore, the shape of the through hole 111 is adapted to the contour of the lead-out portion of the tab, and the number of through holes 111 matches the number of tabs.

[0052] The fixing member 200 is made of a non-metallic plastic material and includes two parts: a first fixing portion 210 and a second fixing portion 220 connected to the first fixing portion 210. The first fixing portion 210 and the second fixing portion 220 are located on either side of the upper cover 110, namely, on the outer wall and inner wall of the upper cover 110. The connecting piece 300 is fixed by bonding, specifically using a heat-resistant epoxy resin adhesive, which is fixed to the first fixing portion 210 after a certain curing time. Furthermore, a portion of the tab located inside the shell body 100 can be led out of the through hole 111, and the lead end is electrically connected to the connecting piece 300. Through this shell assembly, the connecting piece 300 and a portion of the tab structure are fixed to the outside of the shell body 100, avoiding the existing solution of placing them inside the shell body and improving the space utilization inside the battery. The bonding process is simple to operate, requiring only the application of epoxy resin adhesive to the connecting portion of the connecting piece 300 or the first fixing portion 210 and allowing it to cure for a certain period of time. In addition, during the process of leading out the tab, the shaping structure 230 located in the second fixing portion 220 can be used to bend and fold the tab toward the connecting piece 300, thereby ensuring the tab's folded shape, avoiding battery short circuits, and improving safety.

[0053] Optionally, a receiving groove 211 is provided on the first fixing portion 210 , and the connecting piece 300 is disposed in the receiving groove 211 .

[0054] In this embodiment, the receiving groove 211 provides a positioning and installation space for the connecting piece 300 . The size of the connecting piece 300 may be smaller than that of the receiving groove 211 to facilitate smooth configuration of the connecting piece 300 inside the receiving groove 211 .

[0055] Furthermore, the first fixing portion 210 is provided with lead-out holes 212 on both sides of the accommodating groove 211 . The lead-out holes 212 are arranged opposite to the through hole 111 . The tab passes through the through hole 111 and out from the lead-out holes 212 .

[0056] In this embodiment, the lead-out hole 212 is opposite to the through hole 111 , and the tab portion extending from the through hole 111 is electrically connected to the connecting piece 300 through the lead-out hole 212 . The lead-out hole 212 has a certain avoidance effect.

[0057] See attached Figure 7 , Attachment Figure 9 , Attachment Figure 14 and attached Figure 15 Optionally, an opening 221 is provided on the second fixing portion 220 at a position relative to the through hole 111, and the shaping structure 230 includes guide slopes 231 respectively provided on both sides of the opening 221, and the tab can be retracted toward the opening 221 through the guiding and extruding effects of the guide slopes 231.

[0058] In this embodiment, the second fixing portion 220 is generally plate-shaped and can specifically adapt to the shape of the inner cavity of the housing body 100. A portion of the tab is disposed within the inner cavity of the housing body 100, while the other portion passes through the strip-shaped opening 221 on the second fixing portion 220 and is led out of the housing body 100 through the through-hole 111 and the lead-out hole 212 to be electrically connected to the connecting piece 300. To enhance the retraction of the lead-out portion of the tab, guide slopes 231 are provided on both sides of the opening 221 on the second fixing portion 220. The lead-out portion of the tab can be retracted toward the opening 221 under the guiding and squeezing effects of the guide slopes 231.

[0059] Specifically, two guide slopes 231 are located on either side of the opening 221 and gradually extend obliquely toward the opening 221. They are respectively connected to two opposing inner walls of the opening 221, and a guide groove can be formed between the two guide slopes 231. In this embodiment, the guide slopes 231 are flat surfaces. Of course, in other embodiments, curved surfaces can also be used to achieve the same effect of gathering the tabs.

[0060] Optionally, the tab passes through the opening 221 and the through hole 111 in sequence.

[0061] After being shaped by the guide slope 231, the tab smoothly passes through the opening 221, passes through the through hole 111, and finally leads out of the lead-out hole 212 to be electrically connected to the connecting piece 300. The opening 221, through hole 111, and lead-out hole 212 can have the same structure and size. In this embodiment, all three are rectangular holes of equal size.

[0062] Optionally, a liquid injection hole 114 is provided on the shell body 100 .

[0063] In this embodiment, the injection port 114 is located between the positive and negative electrodes. The most direct function of the injection port 114 is to allow electrolyte to be injected into the battery. Electrolyte is a key component in batteries, used to transport ions and has a direct impact on battery performance and lifespan. Furthermore, during battery use, electrolyte replenishment may be necessary due to various reasons (such as electrolyte evaporation or leakage). In such cases, the injection port 114 provides a convenient way to replenish the electrolyte, helping to extend the battery's service life. Furthermore, during battery repair or modification, the injection port 114 is also an important access for internal inspection and adjustment. In some battery types, particularly those that may generate gas during charging and discharging (such as lead-acid batteries), the injection port 114 is also used to discharge this gas to prevent excessive internal pressure and ensure safe battery operation. In some advanced battery management systems, the injection port 114 may also be designed to facilitate the installation of sensors or sampling points to monitor the electrolyte status (such as concentration and temperature) within the battery in real time, thereby achieving precise control and optimization of battery performance.

[0064] Optionally, a mounting hole 112 is provided on the shell body 100, and the shell assembly further includes an explosion-proof valve 400, which is arranged in the mounting hole 112. The explosion-proof valve 400 is provided with a notch for pressure relief, and the notch is provided on the side of the explosion-proof valve 400 facing the interior of the shell body 100 or on the side of the explosion-proof valve 400 facing away from the interior of the shell body 100.

[0065] In this embodiment, the shape of the mounting hole 112 is adapted to the structure of the explosion-proof valve 400. The mounting hole 112 is arranged between the positive pole and the negative pole of the upper cover 110. The mounting hole 112 is provided with a cross-shaped support rib for supporting the explosion-proof valve 400. At the same time, a connecting platform of a certain length is protruding inward on the circumferential inner wall of the mounting hole 112 for further supporting the explosion-proof valve 400. The explosion-proof valve 400 is also provided with a notch for pressure relief, which is an indentation formed by a stamping process during the manufacturing process. These notches play a key role when an abnormal situation occurs in the battery (such as overcharging, over-discharging, short circuit, etc.), specifically: relieving internal pressure. When the internal pressure of the battery rises sharply due to an abnormal situation, the notched area on the explosion-proof valve 400 will first be deformed by the pressure, thereby helping to relieve the pressure inside the battery; releasing gas. As the internal pressure continues to rise, the explosion-proof valve 400 will rupture at the notch, releasing the gas accumulated inside the battery to prevent the battery from exploding or catching fire; improving safety. The design of the notch has been precisely calculated and experimentally verified, and its depth, shape, and position have been strictly considered to ensure that pressure can be released safely and effectively in an emergency, protecting the safety of the battery and the user. In summary, the notches on the explosion-proof valve 400 are one of the important designs to ensure battery safety. They prevent the battery from exploding or catching fire in abnormal situations by relieving internal pressure and releasing gas.

[0066] Optionally, the shell body 100 is provided with a limiting groove 113 , and a limiting structure 213 is provided around the circumference of the first fixing portion 210 , and the first fixing portion 210 is positioned relative to the shell body 100 by the cooperation between the limiting structure 213 and the limiting groove 113 .

[0067] Please further refer to Appendix 5 and Appendix Figure 10 -Attached Figure 14 In this embodiment, a limiting groove 113 is provided on the upper cover 110, which matches the shape of the first fixing part 210 and is specifically a quadrilateral. A limiting structure 213 of a certain height is protruded from the outer periphery of the first fixing part 210. The limiting structure 213 can be a protruding flange platform. The first fixing part 210 is positioned relative to the upper cover 110 through the cooperation of the flange platform and the limiting groove 113, thereby ensuring that the first fixing part 210 is reliably limited.

[0068] In this embodiment, the width dimension α of the limiting structure 213 is 1 mm to 10 mm. If the width dimension α is too small, the limiting structure 213 is not convenient to fix. If the width dimension α is too large, the limiting structure 213 will increase the material and cost, and affect the structure and weight of the entire shell assembly.

[0069] On the other hand, preferably, the distance from the bottom wall of the receiving groove 211 to the top wall of the housing body 100 is β, and the thickness of the housing body 100 is λ, where λ is 1.2 mm to 1.8 mm. When the bottom wall of the receiving groove 211 is higher than the top wall of the housing body 100, β is no greater than λ; however, when the bottom wall of the receiving groove 211 is lower than the top wall of the housing body 100, β is no greater than 0.5λ. In this embodiment, β needs to be limited to an appropriate range. If the distance from the bottom wall of the receiving groove 211 to the top surface of the upper cover 110 is too high, it is likely to result in increased material and weight, increasing costs. If the distance from the bottom wall of the receiving groove 211 to the top surface of the upper cover 110 is too low, the strength of the entire housing assembly is reduced, and its use is not recommended.

[0070] Optionally, the first fixing portion 210 and the second fixing portion 220 are an integrated structure or a split structure.

[0071] In this embodiment, if the first fixing portion 210 and the second fixing portion 220 are separate structures, they can form an upper plastic structure located outside the upper cover 110 and a lower plastic structure located inside the upper cover 110. If the first fixing portion 210 and the second fixing portion 220 are integral structures, they can be integrally formed using insert injection molding. Those skilled in the art can make a targeted selection based on comprehensive economic considerations.

[0072] The second aspect of this embodiment further relates to a battery, which includes a battery cell, the above shell assembly and a tab, and the battery cell is arranged inside the shell body 100.

[0073] In this embodiment, the battery based on this shell assembly can effectively improve the space utilization inside the battery, and has a good retraction effect for the assembly of the tabs, which can effectively avoid battery short circuit.

[0074] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A housing assembly, characterized in that: include: A housing body (100), wherein a through hole (111) is provided on the top of the housing body (100); A fixing member (200), the fixing member (200) comprising a first fixing portion (210) and a second fixing portion (220), the first fixing portion (210) being arranged on an outwardly facing wall surface of the shell body (100), the second fixing portion (220) being arranged inside the shell body (100), and a shaping structure (230) being provided on the second fixing portion (220); a connecting piece (300) provided on the first fixing portion (210), wherein the connecting piece (300) is fixed to the first fixing portion (210) by bonding; A portion of the structure of the tab located inside the shell body (100) can be bent toward the connecting piece (300) through the extrusion of the shaping structure (230) and pass through the through hole (111) to be electrically connected to the connecting piece (300).

2. The housing assembly according to claim 1, wherein: The first fixing portion (210) is provided with a receiving groove (211), and the connecting piece (300) is arranged in the receiving groove (211).

3. The housing assembly according to claim 2, wherein: The first fixing portion (210) is provided with lead-out holes (212) on both sides of the accommodating groove (211), the lead-out holes (212) being arranged opposite to the through hole (111), and the tab passes through the through hole (111) and out from the lead-out holes (212).

4. The housing assembly according to claim 2, wherein: The distance from the bottom wall of the accommodating groove (211) to the top wall of the shell body (100) is β, the thickness of the top wall of the shell body (100) is λ, and λ is 1.2 mm to 1.8 mm. When the bottom wall of the accommodating groove (211) is higher than the top wall of the shell body (100), β is not greater than λ; when the bottom wall of the accommodating groove (211) is lower than the top wall of the shell body (100), β is not greater than 0.5λ.

5. The housing assembly according to claim 1, wherein: An opening (221) is provided on the second fixing portion (220) at a position relative to the through hole (111); the shaping structure (230) includes guiding inclined surfaces (231) respectively provided on both sides of the opening (221); and the tab can be retracted toward the opening (221) through the guiding and squeezing effects of the guiding inclined surfaces (231).

6. The housing assembly according to claim 5, wherein: The tab passes through the opening (221) and the through hole (111) in sequence.

7. The housing assembly according to any one of claims 1 to 6, characterized in that: The shell body (100) is provided with a mounting hole (112), and the shell assembly further includes an explosion-proof valve (400), the explosion-proof valve (400) is arranged in the mounting hole (112), and the explosion-proof valve (400) is provided with a notch for pressure relief, and the notch is provided on a side of the explosion-proof valve (400) facing the interior of the shell body (100) or on a side of the explosion-proof valve (400) facing away from the interior of the shell body (100).

8. The housing assembly according to any one of claims 1 to 6, characterized in that: The shell body (100) is provided with a limiting groove (113), and a limiting structure (213) is provided in the circumference of the first fixing portion (210). The limiting structure (213) cooperates with the limiting groove (113) to achieve positioning of the first fixing portion (210) relative to the shell body (100).

9. The housing assembly according to any one of claims 1 to 6, characterized in that: The first fixing portion (210) and the second fixing portion (220) are an integrated structure or a split structure.

10. A battery comprising a cell, characterized in that It also includes the shell assembly and the tab according to any one of claims 1 to 9, and the battery core is arranged inside the shell body (100).

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