Metal shell battery and battery pack

Abstract

The battery pack comprises the metal shell battery, the metal shell battery comprises a shell, the shell comprises a bottom plate and a surrounding plate, the surrounding plate is arranged on the bottom plate, the bottom plate and the surrounding plate jointly define a containing cavity, the bottom plate is provided with a first surface and a second surface which are opposite, the first surface is provided with a receding groove, and the second surface is provided with a second receding groove; an avoiding boss is arranged at the bottom of the avoiding groove, a mounting groove is formed in the second surface, a mounting hole is formed in the bottom of the mounting groove, and the mounting hole communicates with the storage cavity and the mounting groove; the sealing nail is detachably inserted into the mounting groove, so that the sealing nail can block or open the mounting hole; and the connecting structure is used for fixing the position of the sealing nail in the mounting groove. Therefore, the space in the metal shell can be emptied after formation, and the metal shell is plugged again after formation so as to ensure the air tightness of the product.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a metal shell battery and a battery pack. Background Art

[0002] In current battery manufacturing technology, the formation process (i.e. the process of charging the battery for the first time to activate the electrochemical properties) is very important in its production process. Generally speaking, the processing methods of square batteries and soft-pack batteries respectively use negative pressure exhaust formation technology and vacuum exhaust strategy during secondary packaging to effectively manage the gas generated during the formation process.

[0003] But for metal shell batteries, they are composed of a high-strength steel shell and a precisely designed cap, which are connected by a highly reliable mechanical pressure sealing technology to ensure the airtightness and structural strength of the battery, which is crucial to the safety, cycle life and overall performance of the battery. This structural design is designed to withstand high internal pressure and prevent the penetration of external contaminants, and is the basis for ensuring the stable operation of the battery in complex working environments and various harsh conditions. However, the metal shell battery with this design also brings certain technical deficiencies:

[0004] During the formation process, due to the sealing properties of the steel shell and the cap and their positioning function during PACK integration, it is impossible to open an exhaust port, resulting in the accumulation of gas generated by the formation in the steel shell. If the gas adheres to the diaphragm and the electrode, there will be gaps between the diaphragm and the electrode, and the fit will be poor, which will affect the film formation effect of the negative electrode, which is not conducive to the transmission of Li ions during the charge and discharge process, affecting the battery rate performance and cycle life. In severe cases, lithium may even be deposited on the negative electrode surface, seriously affecting the safety of battery use. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a metal shell battery and a battery pack, which can solve the problem that the gas generated by formation cannot be discharged.

[0006] The first aspect of the utility model provides a metal shell battery, comprising:

[0007] A shell, the shell comprising a bottom plate and a surrounding plate, the surrounding plate being arranged on the bottom plate, the bottom plate and the surrounding plate jointly enclose a storage cavity, the bottom plate having a first surface and a second surface opposite to each other, a position avoidance groove being provided on the first surface, a position avoidance boss being provided on the bottom of the position avoidance groove, a mounting groove being provided on the second surface, a mounting hole being provided on the bottom of the mounting groove, the mounting hole communicating the storage cavity with the mounting groove;

[0008] A sealing nail, which is detachably inserted into the mounting groove, so that the sealing nail can block or open the mounting hole; and

[0009] A connecting structure is used to fix the sealing pin in the installation groove.

[0010] Preferably, the connection structure includes a connection adhesive, the connection adhesive is arranged in the installation groove, and the connection adhesive connects the inner side wall of the installation groove and the sealing nail respectively.

[0011] Preferably, the connecting glue comprises UV glue.

[0012] Preferably, the sealing nail includes a limiting portion and an inserting portion, the limiting portion is connected to the inserting portion, and the limiting portion is detachably installed in the mounting groove, so that the inserting portion is inserted into the mounting hole.

[0013] Preferably, the depth of the avoidance groove is equal to or greater than the height of the avoidance boss.

[0014] Preferably, the metal shell battery further includes a battery cell and a busbar, the battery cell is arranged in the storage cavity, the busbar is arranged on the first surface, and the battery cell is connected to the busbar.

[0015] Preferably, after at least a portion of the bottom plate is deformed, a flange portion is formed on the first surface, and the flange portion is abutted against the busbar.

[0016] Preferably, the protrusion amount of the flange portion relative to the first surface is 0.42 mm to 0.67 mm.

[0017] Preferably, the diameter of the mounting hole is 1.4 mm to 2.6 mm; and / or

[0018] The mounting groove is a circular groove, and the diameter of the mounting groove is 4.5 mm to 7.2 mm; and / or

[0019] The groove depth of the installation groove is 0.32mm to 0.57mm.

[0020] The second aspect of the utility model further provides a battery pack, which includes a battery box and a plurality of metal shell batteries described in any one of the above technical solutions, and each of the metal shell batteries is arranged in the battery box.

[0021] The implementation of this utility model has the following beneficial effects:

[0022] The utility model relates to a metal shell battery and a battery pack. Firstly, by setting a mounting groove and a avoiding boss, it is possible to avoid a sealing nail from protruding from a second surface to a certain extent, so that a sealing top can be smoothly installed; further, by opening a mounting hole, the sealing nail can block the mounting hole during formation to prevent leakage, and after formation, the mounting hole can be opened for exhaust to prevent gas accumulation in a storage cavity; further, by setting a connecting structure, the sealing nail that re-blocks the mounting hole after exhaust can be further fixed, and the connecting structure can also further seal the matching gap between the sealing nail and the bottom plate, so as to ensure the sealing of the product and improve the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0024] Figure 1 It is a schematic diagram of the structure of the metal shell battery in some embodiments of the utility model;

[0025] Figure 2 From another perspective Figure 1 Schematic diagram of the structure of the metal shell battery shown;

[0026] Figure 3 Schematic diagram of the internal structure of the metal shell battery in some embodiments of the utility model;

[0027] Figure 4 yes Figure 3 A magnified view at point A;

[0028] Figure 5 yes Figure 3 Enlarged view at B.

[0029] Figure ID:

[0030] 10-Metal shell battery;

[0031] 1-housing; 11-bottom plate; 111-first surface; 1111-avoidance groove; 1112-avoidance boss; 1113-flange portion; 112-second surface; 1121-mounting groove; 1122-mounting hole; 12-enclosing plate; 13-storage cavity;

[0032] 2-sealing nail; 21-limiting part; 22-insertion part;

[0033] 3-Battery cell;

[0034] 4-Manifold. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0036] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0039] Figure 1 and Figure 2 The metal shell battery 10 in some embodiments of the present invention is shown, and the metal shell battery 10 is used for energy storage.

[0040] like Figure 1 and Figure 2As shown, the metal shell battery 10 comprises a shell 1, a sealing nail 2 and a connecting structure, wherein the sealing nail 2 and the connecting structure are respectively arranged on the shell 1. It can be understood that the shell 1 plays a role in protecting the internal components. The sealing nail 2 is used to seal or open a predetermined position on the shell 1 when necessary.

[0041] like Figures 1 to 5 As shown, the shell 1 includes a base plate 11 and a surrounding plate 12, the surrounding plate 12 is arranged on the base plate 11, the base plate 11 and the surrounding plate 12 together enclose a storage cavity 13, the base plate 11 has a first surface 111 and a second surface 112 relative to each other, a avoidance groove 1111 is provided on the first surface 111, a avoidance boss 1112 is provided at the bottom of the avoidance groove 1111, a mounting groove 1121 is provided on the second surface 112, a mounting hole 1122 is provided at the bottom of the mounting groove 1121, and the mounting hole 1122 connects the storage cavity 13 and the mounting groove 1121.

[0042] It can be understood that the bottom plate 11 and the surrounding plate 12 together play the role of accommodating and protecting the internal components of the battery. The storage cavity 13 plays the role of accommodating and installing. The first surface 111 is located in the storage cavity 13, and the second surface 112 is located at the bottom of the metal shell battery 10.

[0043] The arrangement of the avoidance boss 1112 provides the required space for the installation of the sealing pin 2, and the opening of the avoidance groove 1111 prevents the protrusion of the avoidance boss 1112 from affecting the installation of other parts. The opening of the installation groove 1121 provides the required space for the installation of the sealing pin 2 on the second surface 112. The installation hole 1122 is for the sealing pin 2 to pass through to form a seal, and serves to connect the storage chamber 13 with the outside world after the sealing pin 2 is removed.

[0044] like Figure 2 and Figure 4 As shown, the sealing nail 2 is detachably inserted into the mounting groove 1121, so that the sealing nail 2 can block or open the mounting hole 1122. The connection structure is used to fix the position of the sealing nail 2 in the mounting groove 1121.

[0045] It can be understood that the detachable design of the sealing nail 2 allows the product to be easily inserted into the mounting groove 1121 before formation, so as to effectively seal the mounting hole 1122 and maintain the airtightness of the battery. During the formation process, the sealing nail can be removed by simple operation to open the mounting hole 1122, so that the gas generated by the formation can be discharged smoothly, thereby avoiding the accumulation of gas in the storage chamber 13.

[0046] The setting of the connecting structure ensures that the sealing nail 2 is firmly positioned in the mounting groove 1121. Even when the battery is subjected to external stress such as vibration and impact, it can maintain its sealing stability and prevent accidental disengagement or displacement, thereby enhancing the stability of the entire battery structure and the reliability of long-term use, reducing the battery performance degradation or safety accidents caused by sealing failure, and improving the safety factor of the battery.

[0047] It should be noted that the connection structure can be any structure that can play a connecting role in the relevant technology, as long as it can firmly and reliably fix the sealing nail 2.

[0048] In some embodiments of the metal shell battery 10 , the connection structure includes a connection glue, which is disposed in the mounting groove 1121 , and the connection glue connects the inner side wall of the mounting groove 1121 and the sealing nail 2 , respectively.

[0049] It is understandable that the connection glue can be a common connection and sealing glue in the related art. The connection structure is configured as a connection glue. On the one hand, the sealing nail 2 can be fixed in position by the connection glue. On the other hand, the connection glue can also fully fill the matching gap between the inner wall of the installation groove 1121 and the sealing nail 2, thereby further improving the sealing performance and ensuring the sealing performance of the product.

[0050] It should be noted that the connection adhesive can be configured to be filled in the installation groove 1121 and not protrude from the second surface 112, so as to prevent the connection adhesive from affecting the placement of the product.

[0051] In some embodiments of the metal case battery 10 , the connection adhesive includes UV adhesive.

[0052] It can be understood that UV glue has fast curing, high strength and excellent environmental adaptability. The sealing nail 2 is correctly placed in the installation groove 1121, and the UV glue is injected and distributed between the groove wall of the installation groove 1121 and the sealing nail 2. Subsequently, through ultraviolet irradiation, the glue is caused to cure in a short time to form a strong adhesive layer. In this way, not only the production cycle is greatly shortened, but also the stability of the connection and the lasting sealing effect are ensured, and the airtightness of the battery can be maintained even in harsh working environments.

[0053] like Figure 4 As shown, in some embodiments of the metal shell battery 10, the sealing nail 2 includes a limiting portion 21 and an insertion portion 22, the limiting portion 21 is connected to the insertion portion 22, and the limiting portion 21 can be detachably installed in the installation groove 1121, so that the insertion portion 22 is inserted into the installation hole 1122.

[0054] It can be understood that the limiting portion 21 ensures that the sealing pin is firmly positioned in the mounting groove 1121, and the insertion portion 22 is directly inserted into the mounting hole 1122 to close the mounting hole 1122. After the insertion portion 22 is pulled out, the mounting hole 1122 can be opened, so that exhaust can be carried out through the mounting hole 1122.

[0055] In some embodiments of the metal shell battery 10 , the depth of the avoidance groove 1111 is equal to or greater than the height of the avoidance boss 1112 .

[0056] It can be understood that by setting the depth of the avoidance groove 1111 to be at least equal to the height of the avoidance boss 1112, it can be ensured that during the assembly process, when the elements on the base plate 11 (such as the electrode current collector or other components) are installed, the avoidance boss 1112 can be completely located in the groove space of the avoidance groove without causing excessive protrusion or deformation of the base plate 11, thereby maintaining the overall flatness and strength of the shell 1.

[0057] like Figure 3 As shown, in some embodiments of the metal shell battery 10 , the metal shell battery 10 further includes a battery cell 3 and a busbar 4 , the battery cell 3 is disposed in the storage cavity 13 , the busbar 4 is disposed on the first surface 111 , and the battery cell 3 is connected to the busbar 4 .

[0058] It can be understood that the battery cell 3 is used for storing and releasing electric energy. It realizes the conversion of electric energy through internal chemical reactions (storing electric energy during charging and releasing electric energy during discharging). The busbar 4 plays the role of electric energy transmission and is used to conduct the battery cell 3 with the electrodes of the battery.

[0059] like Figure 5 As shown, in some embodiments of the metal shell battery 10 , after at least a portion of the bottom plate 11 is deformed, a flange portion 1113 is formed on the first surface 111 , and the flange portion 1113 is abutted against the busbar 4 .

[0060] It can be understood that a portion of the bottom plate 11 is processed by a precise deformation process to form a flange portion 1113 on its first surface 111. The forming process of the flange portion 1113 may be achieved by calendaring, stamping or other forming techniques, which can create an additional mechanical support structure without destroying the overall structural strength of the bottom plate 11. The flange portion 1113 directly acts on the busbar 4, playing a role in enhancing support and fixing.

[0061] Furthermore, in some embodiments, the forming of the flange portion 1113 will also be accompanied by the formation of a corresponding groove on the second surface 112 .

[0062] like Figure 5As shown, in some embodiments of the metal shell battery 10 , the protrusion amount T of the flange portion 1113 relative to the first surface 111 is 0.42 mm to 0.67 mm.

[0063] It can be understood that the protrusion amount T within the range of this type of embodiment can ensure that the flange portion 1113 has sufficient holding force on the busbar, and can maintain good contact and fixing effects even when the battery undergoes temperature changes causing thermal expansion and contraction of the material, or is subjected to external mechanical forces. At the same time, it can also prevent the flange portion 1113 from occupying too much internal space of the battery, thereby ensuring the energy density of the battery.

[0064] like Figure 4 As shown, in some embodiments of the metal shell battery 10, the size of the hole diameter D1 of the mounting hole 1122 is 1.4 mm to 2.6 mm.

[0065] It can be understood that the aperture D1 within the scope of this type of embodiment can ensure efficient discharge of the gas generated by the formation, ensure that the gas is fully discharged, and improve the yield of the product.

[0066] like Figure 4 As shown, in some embodiments of the metal shell battery 10, the mounting groove 1121 is a circular groove, and the diameter D2 of the mounting groove 1121 is 4.5 mm to 7.2 mm.

[0067] It can be understood that the diameter of the installation groove 1121 ensures that the sealing nail 2 can be firmly inserted and maintain good position stability. Within the diameter range of this embodiment, the sealing nail is neither too tight to be difficult to install nor too loose to affect the sealing effect, thereby ensuring stable fixation inside the battery.

[0068] like Figure 5 As shown, in some embodiments of the metal shell battery 10, the groove depth W of the mounting groove 1121 is 0.32 mm to 0.57 mm.

[0069] It can be understood that the groove depth W ensures that the sealing nail 2 can be embedded and maintain an appropriate pressing force, and neither too loose to fall off nor too tight to cause assembly difficulties or material deformation. The groove depth within this range helps to achieve a reliable mechanical connection.

[0070] In some embodiments, the metal shell battery further includes a cover, which is disposed on the enclosure 12 . The cover and the bottom plate 11 are respectively disposed on both ends of the cylindrical enclosure 12 , thereby forming a closed storage chamber 13 .

[0071] The battery pack of the present invention comprises a battery box and a plurality of metal shell batteries 10 , each of which is disposed in the battery box.

[0072] It can be understood that each metal shell battery 10 is arranged in a preset arrangement in the battery box, and each metal shell battery 10 can be isolated by an insulating gasket or a bracket to prevent short circuit and ensure the electrical safety of the battery pack.

[0073] The implementation of this utility model has the following beneficial effects:

[0074] The utility model relates to a metal shell battery and a battery pack. Firstly, by setting a mounting groove and a avoiding boss, it is possible to avoid a sealing nail from protruding from a second surface to a certain extent, so that a sealing top can be smoothly installed; further, by opening a mounting hole, the sealing nail can block the mounting hole during formation to prevent leakage, and after formation, the mounting hole can be opened for exhaust to prevent gas accumulation in a storage cavity; further, by setting a connecting structure, the sealing nail that re-blocks the mounting hole after exhaust can be further fixed, and the connecting structure can also further seal the matching gap between the sealing nail and the bottom plate, so as to ensure the sealing of the product and improve the safety of the product.

[0075] The scheme of the utility model has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. Those skilled in the art should also know that the actions and modules involved in the specification are not necessarily required for the utility model. In addition, it can be understood that the steps in the method of the embodiment of the utility model can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the utility model can be merged, divided and deleted according to actual needs.

[0076] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A metal shell battery, characterized in that: include: A shell (1), the shell (1) comprising a bottom plate (11) and a surrounding plate (12), the surrounding plate (12) being arranged on the bottom plate (11), the bottom plate (11) and the surrounding plate (12) jointly enclosing a storage cavity (13), the bottom plate (11) having a first surface (111) and a second surface (112) opposite to each other, the first surface (111) being provided with a position avoidance groove (1111), the bottom of the position avoidance groove (1111) being provided with a position avoidance boss (1112), the second surface (112) being provided with a mounting groove (1121), the bottom of the mounting groove (1121) being provided with a mounting hole (1122), the mounting hole (1122) connecting the storage cavity (13) and the mounting groove (1121); A sealing pin (2), the sealing pin (2) being detachably inserted into the mounting groove (1121), so that the sealing pin (2) can block or open the mounting hole (1122); and A connecting structure, wherein the connecting structure is used to fix the sealing pin (2) in the installation groove (1121).

2. The metal shell battery according to claim 1, characterized in that: The connection structure comprises a connection adhesive, the connection adhesive is arranged in the installation groove (1121), and the connection adhesive respectively connects the inner side wall of the installation groove (1121) and the sealing nail (2).

3. The metal shell battery according to claim 2, characterized in that: The connecting glue includes UV glue.

4. The metal shell battery according to claim 1, characterized in that: The sealing nail (2) comprises a limiting portion (21) and an inserting portion (22), wherein the limiting portion (21) is connected to the inserting portion (22), and the limiting portion (21) can be detachably installed in the installation groove (1121), so that the inserting portion (22) is inserted into the installation hole (1122).

5. The metal shell battery according to claim 1, characterized in that: The depth of the avoidance groove (1111) is equal to or greater than the height of the avoidance boss (1112).

6. The metal shell battery according to claim 1, characterized in that: The metal shell battery further comprises a battery cell (3) and a busbar (4); the battery cell (3) is arranged in the storage cavity (13); the busbar (4) is arranged on the first surface (111); and the battery cell (3) is connected to the busbar (4).

7. The metal shell battery according to claim 6, characterized in that: After at least part of the bottom plate (11) is deformed, a flange portion (1113) is formed on the first surface (111), and the flange portion (1113) is abutted against the busbar (4).

8. The metal shell battery according to claim 7, characterized in that: The protrusion amount of the flange portion (1113) relative to the first surface (111) is 0.42 mm to 0.67 mm.

9. The metal shell battery according to claim 1 or 8, characterized in that: The diameter of the mounting hole (1122) is 1.4 mm to 2.6 mm; and / or The installation groove (1121) is a circular groove, and the diameter of the installation groove (1121) is 4.5 mm to 7.2 mm; and / or The groove depth of the installation groove (1121) is 0.32 mm to 0.57 mm.

10. A battery pack, characterized in that: The battery pack comprises a battery box and a plurality of metal shell batteries according to any one of claims 1 to 9, wherein each of the metal shell batteries is disposed in the battery box.

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