Shell and cylindrical battery with same

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a shell and a cylindrical battery with the same. The shell comprises a top cover, a pole, a collector plate and a detachable connecting piece, a first through hole is formed in the top cover, the pole is mounted in the first through hole, two surfaces of the collector plate are respectively connected to the cylindrical battery cell and the pole, and the collector plate is detachably connected with the pole through the detachable connecting piece. Through the arrangement, the collector plate and the pole can be tightly attached, and compared with existing laser penetration welding, the conditions of pseudo soldering, welding deformation, heat release in the welding process and the like can be effectively avoided, so that higher reliability and use safety are achieved. By arranging the shell in the cylindrical battery, the influence on the output power and the service life of the cylindrical battery can be reduced while better connection strength between the pole and the collector plate in the cylindrical battery is ensured, so that the use safety and reliability of the cylindrical battery are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a shell and a cylindrical battery having the same. Background Art

[0002] As the research on lithium battery technology continues to mature, lithium batteries are widely used in new energy equipment such as electric vehicles and hybrid vehicles.

[0003] Cylindrical batteries consist of a shell, cylindrical cells, electrodes, and a current collector. The shell is connected to the positive electrode of the cylindrical cell via the current collector. The shell has a through-hole, and the electrode is installed in the through-hole and connected to the current collector. Currently, the current collector and electrode of cylindrical batteries are usually connected by laser penetration welding. However, during the production process, problems such as cold welds, welding deformation, heat release during welding, and difficulty in determining the welding process are prone to occur. Cold welds can affect the battery's internal resistance, affecting the battery's output power and battery life, and generating high heat during charging and discharging, thereby reducing safety. Utility Model Content

[0004] The purpose of the present utility model is to provide a shell and a cylindrical battery having the same, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A shell for mounting a cylindrical battery cell, the shell comprising a top cover, a pole, a current collecting plate and a detachable connector, the top cover being provided with a first through hole, the pole being mounted in the first through hole, the two surfaces of the current collecting plate being respectively connected to the cylindrical battery cell and the pole, and the current collecting plate being detachably connected to the pole via the detachable connector.

[0007] Preferably, the pole is provided with a second through hole, the collecting plate is provided with a mounting hole, the mounting hole is coaxially arranged and connected to the second through hole, and the detachable connector is passed through the second through hole and the mounting hole.

[0008] Preferably, the mounting hole is an internal threaded hole, and the detachable connecting member is a threaded member. After the threaded member is passed through the second through hole, it is threadedly connected to the internal threaded hole.

[0009] Preferably, the opening of the internal threaded hole is connected to the cylindrical battery core.

[0010] Preferably, the threaded member is a screw.

[0011] Preferably, the end cap portion of the screw has a cross sink.

[0012] Preferably, a mounting groove is provided at the bottom of the pole, and the mounting groove is connected to the second through hole;

[0013] The current collecting plate includes a current collecting base plate and a boss portion. The boss portion is protruding from a side of the current collecting base plate facing the top cover. The boss portion is installed in the installation groove, and the installation hole is opened on the boss portion.

[0014] Preferably, the pole and the detachable connector are fixedly connected by laser welding.

[0015] Preferably, the second through hole is provided with a first notch at the opening, and the end of the detachable connector away from the cylindrical battery core is provided with a second notch, the first notch and the second notch cooperate to form a melting zone, and the melting zone is used to gather the melted pole and the detachable connector to improve the connection strength and sealing of the pole and the detachable connector.

[0016] The utility model also relates to a cylindrical battery, which includes a cylindrical battery core and the above-mentioned shell. The cylindrical battery core is installed in the shell, and one end of the cylindrical battery core close to the top cover of the shell is electrically connected to the collecting plate of the shell.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a shell, which detachably connects the collecting plate and the pole by a detachable connecting piece, which not only ensures that the collecting plate and the pole can be tightly fitted, but also effectively avoids cold welding, welding deformation, heat release during welding, etc. compared with the existing laser penetration welding, thereby having higher reliability and safety in use.

[0019] The present invention also provides a cylindrical battery, including the above-mentioned shell, so that while ensuring good connection strength between the pole and the collecting plate in the cylindrical battery, it can also reduce the impact on the output power and service life of the cylindrical battery, effectively improving the safety and reliability of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a housing provided by an embodiment of the present utility model;

[0021] Figure 2 is a top view of the housing provided by an embodiment of the present utility model;

[0022] Figure 3 It is along Figure 2 Cross-sectional view at AA in the middle;

[0023] Figure 4 yes Figure 3A partial enlarged view of point B in the middle;

[0024] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle.

[0025] In the picture:

[0026] a. Melt zone;

[0027] 1. Top cover; 11. First through hole; 2. Cylinder; 3. Pole; 31. Second through hole; 311. First notch; 32. Mounting groove; 4. Upper plastic part; 5. Lower plastic part; 6. Sealing ring; 7. Collecting plate; 71. Mounting hole; 72. Collecting base plate; 73. Boss; 8. Removable connector; 801. Cross sink; 802. Second notch. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0032] The technical solution provided by the present invention is described below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Combine Figures 1 to 5 As shown, this embodiment provides a housing for mounting cylindrical cells. Specifically, the housing includes a top cover 1, a barrel 2, a bottom cover (not shown), a pole 3, an upper plastic part 4, a lower plastic part 5, a sealing ring 6, a current collecting plate 7, and a detachable connector 8. The top cover 1 and the bottom cover are respectively arranged at both ends of the barrel 2. The barrel 2 is a cylindrical tubular structure. A first through hole 11 is opened on the top cover 1. The first through hole 11 is circular and located at the center of the top cover 1. The pole 3 is installed in the first through hole 11, and the bottom of the pole 3 is electrically connected to the current collecting plate 7. The pole 3 is insulated from the side wall of the first through hole 11 by a portion of the lower plastic part 5. The pole 3 is insulated from the bottom of the top cover 1 by another portion of the lower plastic part 5. The pole 3 is insulated from the top of the top cover 1 by the sealing ring 6 and the upper plastic part 4. This can prevent the pole 3 from contacting the top cover 1 and causing a short circuit, and can also prevent the electrolyte in the housing from leaking out.

[0034] In addition, the surface of the collecting plate 7, which is away from the pole 3, is electrically connected to the cylindrical cell. The top cover 1 is connected to the positive electrode of the cylindrical cell through the collecting plate 7, and the collecting plate 7 is detachably connected to the pole 3 via a detachable connector 8. This arrangement not only ensures a tight fit between the collecting plate 7 and the pole 3, but also effectively avoids cold welds, welding deformation, and heat release during welding compared to existing laser penetration welding, thereby achieving higher reliability and safety.

[0035] Furthermore, in this embodiment, referring to Figure 4 As shown, a second through hole 31 is provided vertically through the pole 3, and a mounting hole 71 is provided vertically on the current collecting plate 7. The mounting hole 71 is coaxially arranged and communicates with the second through hole 31. In this way, by coaxially arranging the pole 3 and the current collecting plate 7, the gap at the connection between the two can be effectively reduced. After the detachable connecting member 8 is passed through the second through hole 31 and the mounting hole 71, the purpose of enhancing the stability and safety of the connection between the two can be achieved.

[0036] In this embodiment, the mounting hole 71 is an internal threaded hole, and the detachable connecting member 8 is a threaded member. After the threaded member is passed through the second through hole 31, it is threadedly connected to the internal threaded hole, so that the pole 3 and the collecting plate 7 are reliably connected through the tightening torque of the threaded member. The collecting plate 7 is not easy to loosen or fall off, and is easy to install, which can effectively extend the service life of the shell.

[0037] Reference Figure 4 The threaded parts are screws, which can further improve the installation convenience of the threaded parts. Compared with the method of using bolts and nuts, it can reduce the required space requirements and does not require additional nuts, which simplifies the structure of the threaded parts and makes the connection efficiency higher.

[0038] Reference Figure 1 The end cap of the screw is provided with a cross sink 801. The setting of the cross sink 801, on the one hand, can facilitate the use of tools (such as a cross screwdriver) to tighten the threaded part into place, and on the other hand, it plays the role of marking the "positive pole", so that the user can accurately determine the position of the positive pole of the cylindrical battery cell.

[0039] In this embodiment, the opening of the internal threaded hole is connected to the cylindrical battery cell so that both the upper and lower ends of the internal threaded hole have openings. In this way, electrolyte can be injected into the interior of the shell through the second through hole 31 and the internal threaded hole. After the electrolyte is injected, a threaded member is used to connect the internal threaded hole through the second through hole 31 to connect the pole 3 and the current collecting plate 7, and the injection hole is sealed. By integrating the pole 3 and the injection hole, the step of opening the injection hole on the top cover 1 can be omitted. This not only simplifies the production process of the top cover 1, but also enables the screw to have the function of sealing the injection hole and fixing the connection between the pole 3 and the current collecting plate 7, which effectively improves the practicality of the screw and eliminates the use of sealing nails, thereby simplifying the entire shell structure while reducing processing costs.

[0040] Optionally, in this embodiment, the bottom of the pole 3 is recessed upward to form a mounting groove 32, which is connected to the second through hole 31. The current collecting plate 7 includes a current collecting base plate 72 and a boss portion 73, wherein the current collecting base plate 72 has a boss portion 73 protruding from the side facing the top cover 1, the boss portion 73 is mounted in the mounting groove 32, and the boss portion 73 has a mounting hole 71. The current collecting plate 7 is fixedly connected to the pole 3 via the boss portion 73, and by installing the boss portion 73 in the mounting groove 32, the distance between the current collecting plate 7 and the pole 3 can be effectively reduced, thereby saving space inside the shell and further improving the energy density of the battery using the shell.

[0041] Optionally, the pole 3 and the detachable connector 8 are fixedly connected by laser welding, which increases the stability of the connection between the pole 3 and the detachable connector 8, thereby improving the anti-loosening and sealing effects of the detachable connector 8. Figure 5 As shown, in one implementation of this embodiment, a first notch 311 is provided at the top opening of the second through hole 31, and a second notch 802 is provided at the edge of the screw cap. The first notch 311 and the second notch 802 cooperate to form a groove with a V-shaped cross-section, which is defined as the fusion zone a in this embodiment. Preferably, the fusion zone a is an annular groove to maximize the connection strength between the screw and the pole 3. During the laser welding process of the pole 3 and the screw, a portion of the pole 3 and a portion of the screw melt and converge in the fusion zone a, thereby filling and sealing the assembly gap between the pole 3 and the screw, thereby achieving a stable and sealed connection between the pole 3 and the screw.

[0042] Another object of this embodiment is to provide a cylindrical battery comprising a cylindrical cell and the aforementioned housing. The cylindrical cell is mounted within the housing, and one end of the cylindrical cell near the top cover 1 of the housing is electrically connected to the current collecting plate 7 of the housing. In this embodiment, the positive terminal of the cylindrical cell is located at one end near the top cover 1 and is connected to the current collecting base 72 of the current collecting plate 7. The boss portion 73 of the current collecting plate 7 is connected to the pole 3, and current is output through the pole 3. Of course, it is understood that in other embodiments, the pole 3 can also be set on the bottom cover and connected to the negative pole of the cylindrical cell. In this case, a flat recess is provided at the end cap of the screw to indicate that the negative end of the cylindrical cell is connected to the pole 3. By providing the aforementioned housing in the cylindrical battery, while ensuring a good connection strength between the pole 3 and the current collecting plate 7 in the cylindrical battery, the impact on the output power and service life of the cylindrical battery can be reduced, thereby effectively improving the safety and reliability of the cylindrical battery.

[0043] Throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0044] 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 for mounting cylindrical cells, characterized in that: The housing comprises a top cover (1), a pole (3), a current collecting plate (7) and a detachable connecting piece (8); the top cover (1) is provided with a first through hole (11); the pole (3) is installed in the first through hole (11); two surfaces of the current collecting plate (7) are respectively connected to the cylindrical battery core and the pole (3); and the current collecting plate (7) is detachably connected to the pole (3) via the detachable connecting piece (8).

2. The housing according to claim 1, wherein: The pole (3) is provided with a second through hole (31), the collecting plate (7) is provided with a mounting hole (71), the mounting hole (71) is coaxially arranged and communicated with the second through hole (31), and the detachable connecting member (8) is passed through the second through hole (31) and the mounting hole (71).

3. The housing according to claim 2, wherein: The mounting hole (71) is an internal threaded hole, and the detachable connecting member (8) is a threaded member. After the threaded member is passed through the second through hole (31), it is threadedly connected to the internal threaded hole.

4. The housing according to claim 3, wherein: The opening of the internal threaded hole is connected to the cylindrical battery core.

5. The housing according to claim 3, wherein: The threaded member is a screw.

6. The housing according to claim 5, wherein: The end cap portion of the screw has a cross sink (801).

7. The housing according to claim 2, wherein: A mounting groove (32) is provided at the bottom of the pole (3), and the mounting groove (32) is communicated with the second through hole (31); The current collecting plate (7) comprises a current collecting base plate (72) and a boss portion (73); the boss portion (73) is protrudingly provided on a side of the current collecting base plate (72) facing the top cover (1); the boss portion (73) is installed in the installation groove (32), and the installation hole (71) is opened on the boss portion (73).

8. The housing according to claim 2, wherein: The pole (3) and the detachable connector (8) are fixedly connected by laser welding.

9. The housing according to claim 8, wherein: The second through hole (31) is provided with a first notch (311) at the opening, and the detachable connector (8) is provided with a second notch (802) at one end away from the cylindrical battery core, the first notch (311) and the second notch (802) cooperate to form a melting zone (a), and the melting zone (a) is used to gather the melted pole (3) and the detachable connector (8) to improve the connection strength and sealing performance of the pole (3) and the detachable connector (8).

10. Cylindrical battery, characterized in that The invention comprises a cylindrical battery core and a shell according to any one of claims 1 to 9, wherein the cylindrical battery core is installed in the shell, and one end of the cylindrical battery core close to the top cover (1) of the shell is electrically connected to the collecting plate (7) of the shell.

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