Case structure and battery

Abstract

The utility model discloses a kind of shell structure and battery.The shell structure includes shell main body, pole and first insulating part, shell main body has mounting hole;Pole includes first sub-pole, second sub-pole and PTC thermistor, first sub-pole has first end, second sub-pole has second end, first end, PTC thermistor and second end are sequentially connected to form columnar portion, at least PTC thermistor is located in mounting hole;First insulating part is located between columnar portion and the hole wall of mounting hole.The shell structure of the utility model is integrated in pole structure by PTC thermistor, and the part structure of first sub-pole, second sub-pole and PTC thermistor connection is located in mounting hole, can play the limiting and protection effect to PTC thermistor, avoid the problem of loosening caused by mechanical stress in connecting part, improve connection reliability and the accuracy of temperature detection.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a casing structure and a battery. Background Technology

[0002] In related technologies, to pass UL2054 certification, the traditional approach is to place a PTC thermistor between the tab of the electrode assembly and the post fixed to the housing. However, after the connection is completed, other assembly operations are required, which can easily exert forces on the connection point, affecting the reliability of the connection and thus creating safety hazards. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a housing structure that integrates a PTC thermistor into the electrode structure, which can avoid loosening caused by mechanical stress at the connection points, thereby improving connection reliability and the accuracy of temperature detection.

[0004] This utility model also proposes a battery having the above-mentioned casing structure.

[0005] In a first aspect, embodiments of this application provide a shell structure, including:

[0006] The main body of the shell has mounting holes;

[0007] The electrode includes a first sub-electrode, a second sub-electrode, and a PTC thermistor. The first sub-electrode has a first end, and the second sub-electrode has a second end. The first end, the PTC thermistor, and the second end are sequentially connected to form a columnar portion, and at least the PTC thermistor is located in the mounting hole.

[0008] A first insulating part is disposed between the columnar part and the wall of the mounting hole.

[0009] The housing structure according to the embodiment of this utility model has at least the following beneficial effects: by integrating the PTC thermistor into the electrode structure, and with the first sub-electrode, the second sub-electrode and the part of the structure connecting the PTC thermistor to the PTC thermistor located in the mounting hole, the PTC thermistor can be limited and protected, avoiding loosening caused by mechanical stress on the connection part, and improving the connection reliability and the accuracy of temperature detection.

[0010] According to the first aspect, in one possible implementation, the portion of the first end extending into the mounting hole has a first connecting surface, and the portion of the second end extending into the mounting hole has a second connecting surface, wherein the first connecting surface and the second connecting surface are planes parallel to each other.

[0011] According to the first aspect, in one possible implementation, both the first connecting surface and the second connecting surface are perpendicular to the axial direction of the mounting hole.

[0012] According to the first aspect, in one possible implementation, the distance between the first connecting surface and the second connecting surface is 10 μm to 200 μm.

[0013] According to the first aspect, in one possible implementation, the PTC thermistor includes a first PTC coating disposed on the first connection surface; or,

[0014] The PTC thermistor includes a second PTC coating disposed on the second connection surface; or...

[0015] The first connecting surface is provided with a first PTC coating, and the second connecting surface is provided with a second PTC coating. The first PTC coating and the second PTC coating are connected to form the PTC thermistor.

[0016] According to the first aspect, in one possible implementation, the first sub-pole post includes a first end and a first column, the cross-sectional dimension of the first end being larger than the cross-sectional dimension of the first column; the first end is located outside the shell body, the first column is connected to the side of the first end facing the shell body, and the end of the first column away from the first end forms the first end portion.

[0017] The second sub-pole post includes a second end and a second column, the cross-sectional dimension of the second end is larger than the cross-sectional dimension of the second column; the second end is located inside the housing body and is used for electrical connection with the tab of the electrode assembly, the second column is connected to the side of the second end facing the housing body, and the end of the second column away from the second end forms the second end portion.

[0018] According to the first aspect, in one possible implementation, the housing structure further includes a second insulating portion disposed between the first end and the housing body, and the second insulating portion is connected to the first insulating portion;

[0019] The housing structure further includes a third insulating part, which is disposed between the second end and the housing body, and is connected to the first insulating part.

[0020] According to the first aspect, in one possible implementation, the shell structure includes a first insulating block and a second insulating block, wherein the first insulating block is disposed between the first end and the shell body, and the second insulating block is disposed between the second end and the shell body;

[0021] The first insulating block is configured such that when the first end, the PTC thermistor, and the second end are sequentially connected to form the columnar portion, the first insulating block is compressed and deformed to form the second insulating portion and the first overflow portion connected to the second insulating portion;

[0022] The second insulating block is configured such that when the first end, the PTC thermistor, and the second end are sequentially connected to form the columnar portion, the second insulating block is compressed and deformed to form the third insulating portion and the second overflow portion connected to the third insulating portion;

[0023] Both the first overflow portion and the second overflow portion are located between the columnar portion and the wall of the mounting hole, and the first overflow portion and the second overflow portion abut against each other to form the first insulating portion.

[0024] According to the first aspect, in one possible implementation, the compression of the first insulating block is 45% to 65%; and / or, the compression of the second insulating block is 45% to 65%.

[0025] Secondly, embodiments of this application also provide a battery, the battery including the housing structure described in the first aspect.

[0026] The battery according to the present invention has at least the following beneficial effects: by applying the above-mentioned shell structure, the PTC thermistor can be integrated into the electrode structure, and the part of the structure connecting the first sub-electrode and the second sub-electrode with the PTC thermistor is provided in the mounting hole, which can limit and protect the PTC thermistor, avoid the loosening problem caused by mechanical stress on the connection part, and improve the connection reliability and temperature detection accuracy.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0029] Figure 1 This is a schematic diagram of the shell structure in one embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the pole post structure in one embodiment of the present invention;

[0031] Figure 3 This is a cross-sectional view of the shell structure in one embodiment of the present invention;

[0032] Figure 4This is a schematic cross-sectional view of the shell structure with the insulating rubber block in one state in one embodiment of the present invention;

[0033] Figure 5 This is a cross-sectional schematic diagram of the shell structure in one embodiment of the present invention, showing the insulating rubber block in another state.

[0034] Figure label:

[0035] 100. Shell body; 110. Mounting holes;

[0036] 200, electrode post; 200a, columnar portion; 210, first sub-electrode post; 211, first end; 212, first column; 213, first connecting surface; 220, second sub-electrode post; 221, second end; 222, second column; 223, second connecting surface; 230, PTC thermistor;

[0037] 310. First insulating adhesive block; 311. Second insulating part; 312. First overflow adhesive part; 320. Second insulating adhesive block; 321. Third insulating part; 322. Second overflow adhesive part; 330. First insulating part. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above 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 one or more embodiments or examples.

[0043] In existing technologies, the connection points between the terminals and the PTC thermistor in the battery casing structure are typically exposed outside the casing or in an unsealed state. During battery assembly, mechanical stress generated by subsequent processes such as tab welding and casing encapsulation can easily be transferred to the connection interface, leading to microcracks or poor contact between the PTC thermistor and the terminals. This structural defect may cause overheating risks due to connection failures during safety certification testing, thus hindering the improvement of battery product safety performance.

[0044] To address the aforementioned problems, this application provides a housing structure. In some embodiments, such as... Figures 1 to 3 As shown, the housing structure includes a housing body 100, terminal posts 200, and a first insulating portion 330. The housing body 100 refers to the main structure that supports the terminal posts 200 and forms the battery casing. It can be manufactured using an aluminum alloy die-casting process. The housing body 100 is provided with mounting holes 110, which can be through-hole structures formed by CNC machining. The terminal posts 200 include a first sub-terminal post 210, a second sub-terminal post 220, and a PTC thermistor 230. The first end of the first sub-terminal post 210 and the second end of the second sub-terminal post 220 are connected by the PTC thermistor 230 to form a columnar portion 200a. The columnar portion 200a is at least partially located within the mounting hole 110, specifically, at least the PTC thermistor 230. The first insulating portion 330 is disposed between the columnar portion 200a and the wall of the mounting hole 110. The first insulating portion 330 is injection molded with epoxy resin and fills the annular gap between the columnar portion 200a and the mounting hole 110.

[0045] The ends of the first sub-terminal 210 and the second sub-terminal 220 are mechanically connected and electrically conductive through a PTC thermistor 230. The inner wall of the mounting hole 110 forms a radial limit on the terminal 200, constraining its lateral displacement. The first insulating part 330 forms an annular support to absorb vibration energy generated during external assembly. When external force is applied in subsequent processes, the hole wall of the mounting hole 110 and the first insulating part 330 together form a rigid constraint, preventing external force from directly acting on the connection interface of the PTC thermistor 230 and avoiding connection failure caused by external force transmission.

[0046] Regarding the connection structure between the first sub-terminal 210 and the second sub-terminal 220, the portion of the first end extending into the mounting hole 110 has a first connecting surface 213, and the portion of the second end extending into the mounting hole 110 has a second connecting surface 223. The first connecting surface 213 and the second connecting surface 223 are parallel planes. The first connecting surface 213 and the second connecting surface 223 contact each other via a parallel plane, causing the PTC thermistor 230 to be subjected to an axial clamping force perpendicular to the plane within the mounting hole 110. The parallel plane structure eliminates the relative slippage tendency between the contact surfaces, ensuring that the contact surfaces remain in a close fit even under external lateral forces during assembly. Furthermore, the planar contact method increases the effective contact area, forming a stable conductive path between the terminal 200 and the PTC thermistor 230, avoiding the risk of conductivity degradation or breakage due to mechanical impact, thereby improving the battery's safety performance.

[0047] The first connecting surface 213 refers to the planar contact area formed after the end of the first sub-pole post 210 extends into the mounting hole 110. This area can be achieved through machining or stamping and is used to transmit axial contact pressure. The second connecting surface 223 refers to the planar contact area formed after the end of the second sub-pole post 220 extends into the mounting hole 110. This area can be parallel to the first connecting surface 213 using the same process to create a uniform stress distribution. The parallel planar structure is configured to provide uniform contact force in the axial direction, avoiding shear stress concentration caused by tilting of the contact surface due to assembly or external forces.

[0048] Furthermore, both the first connecting surface 213 and the second connecting surface 223 are perpendicular to the axial direction of the mounting hole 110. The fact that both the first connecting surface 213 and the second connecting surface 223 are perpendicular to the axial direction makes the two connecting surfaces form a contact structure that is parallel and orthogonal to the direction of force. This spatial orientation relationship can eliminate the shear stress component caused by the tilt angle deviation during assembly, and fundamentally suppress the displacement risk of the connection interface under dynamic load.

[0049] The distance between the first connecting surface 213 and the second connecting surface 223 is controlled within the range of 10 micrometers to 200 micrometers, meaning the thickness of the PTC thermistor 230 is also between 10 micrometers and 200 micrometers. The minimum thickness of the PTC thermistor 230 is controlled at 10 micrometers to ensure that it can separate the first sub-terminal 210 and the second sub-terminal 220, preventing any exposed connecting surface. The maximum thickness of the PTC thermistor 230 is controlled at 200 micrometers to avoid affecting its heat dissipation performance.

[0050] The PTC thermistor 230 can be a PTC coating on the first connection surface 213 or a second PTC coating on the second connection surface 223. Alternatively, the first connection surface 213 can have a first PTC coating, and the second connection surface 223 can have a second PTC coating, with the first and second PTC coatings connected to form the PTC thermistor 230. The PTC coating is directly attached to the connection surface of the two sub-terminals, eliminating the need for separate PTC components and avoiding assembly errors and soldering defects associated with independent components. Furthermore, the direct bonding of the PTC coating to the two sub-terminals improves heat conduction efficiency, resulting in more sensitive overcurrent protection response.

[0051] In the previous discussion, the first connecting surface 213 and the second connecting surface 223 are arranged parallel to each other and perpendicular to the axial direction of the mounting hole 110, which can improve the uniformity of PTC coating.

[0052] The PTC coating is mainly composed of barium titanate (BaTiO3)-based semiconductor ceramics, doped with rare earth elements (such as Y, Nb, Bi, Sb) and acceptor elements (such as Mn, Fe), and sintered with glass additives (silicon oxide, alumina). Below the Curie temperature (Tc), the material exhibits a low-resistivity state with high internal carrier mobility and stable resistivity. Above Tc, a phase transition occurs in the crystal structure, hindering carrier migration and causing a sharp increase in resistance (up to 10³–10⁶ times). The specific value of this resistance jump is determined by the material formulation.

[0053] In this application, when the temperature exceeds 100°C, the resistance of the PTC thermistor 230 will increase sharply, blocking the current flow between the first sub-terminal 210 and the second sub-terminal 220, thereby blocking the current and protecting the battery, and preventing the battery from catching fire or exploding.

[0054] In some embodiments, such as Figures 1 to 3As shown, the first sub-pole post 210 includes a first end 211 and a first column 212. The cross-sectional dimension of the first end 211 is larger than the cross-sectional dimension of the first column 212. The first end 211 is located on the outside of the shell body 100, and the first column 212 is connected to the side of the first end 211 facing the shell body 100. The end of the first column 212 away from the first end 211 forms a first end.

[0055] The first end 211 refers to a flange structure located on the outside of the housing. Specifically, it can be implemented using a disc-shaped metal part with a diameter larger than that of the cylinder, whose increased cross-sectional area provides mechanical restraint. The first cylinder 212 refers to a cylindrical conductor connected to the first end 211 and extending into the mounting hole 110 of the housing body 100. Specifically, it can be implemented using a metal rod of the same material as the first end 211. When the first end 211 is located on the outside of the housing, its large size structure provides axial restraint through contact with the outer wall of the housing body 100, preventing displacement of the pole post 200 within the mounting hole 110.

[0056] The structure of the second sub-electrode 220 is similar to that of the first sub-electrode 210. The second sub-electrode 220 includes a second end 221 and a second column 222. The cross-sectional dimension of the second end 221 is larger than that of the second column 222. The second end 221 is located inside the housing body 100 and is used for electrical connection with the tabs of the electrode assembly. The second column 222 is connected to the side of the second end 221 facing the housing body 100, and the end of the second column 222 away from the second end 221 forms a second end portion. When the second end 221 is arranged inside the housing, the second end 221 provides a large-size platform to provide a stable support welding surface for tab welding.

[0057] In this embodiment, the two ends of the columnar portion 200a are respectively connected to the first end 211 and the second end 221 to form an I-shaped structure, which prevents the pole post 200 from moving axially in the mounting hole 110, eliminates the impact of external assembly operations on the PTC connection interface, blocks the transmission path of electrode welding stress, and improves the long-term reliability of the connection between the PTC thermistor 230 and the pole post 200.

[0058] Based on the above structure, such as Figure 1 , Figure 4 and Figure 5 As shown, this application further proposes to provide a second insulating part 311 and a third insulating part 321 between the end of the pole post 200 and the housing body 100, and to connect these two insulating parts to the first insulating part 330 that wraps the columnar part 200a.

[0059] Specifically, the second insulating part 311 refers to the insulating structure disposed between the first end 211 and the shell body 100, which can be injection molded from epoxy resin or polyimide material, and is used to block the conductive path between the first end 211 and the shell body 100. The third insulating part 321 refers to the insulating structure disposed between the second end 221 and the shell body 100, which can be made of the same material and process as the second insulating part 311, and is used to prevent the second end 221 from contacting and conducting with the shell body 100.

[0060] The connection between the second insulating part 311 and the first insulating part 330, and the connection between the third insulating part 321 and the first insulating part 330, refers to the formation of a continuous covering layer through material fusion or mechanical interlocking, thereby constructing an integral insulating barrier between the housing body 100 and the electrode post 200. Simultaneously, the connection between the insulating parts forms an integral support structure. During external assembly, the mechanical stress applied to the electrode post 200 is dispersed and transferred to the housing body 100 by the second insulating part 311 and the third insulating part 321, preventing stress concentration on the PTC thermistor 230.

[0061] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, the above-mentioned integral insulation barrier is constructed by the first insulating block 310 and the second insulating block 320.

[0062] Specifically, the first insulating block 310 is disposed between the first end 211 and the shell body 100, and the second insulating block 320 is disposed between the second end 221 and the shell body 100. When the first insulating block 310, the PTC thermistor 230, and the second end are sequentially connected to form a columnar portion 200a, it undergoes compression deformation to form a second insulating portion 311 and a first overflow portion 312; the second insulating block 320 undergoes compression deformation under the same conditions to form a third insulating portion 321 and a second overflow portion 322. The first overflow portion 312 and the second overflow portion 322 are located between the columnar portion 200a and the wall of the mounting hole 110, and abut against each other to form a first insulating portion 330.

[0063] The first insulating block 310 refers to an elastic insulating material block, which can be made of pre-cured silicone rubber. It undergoes radial expansion deformation through axial compression. The second insulating block 320 has the same composition and deformation mechanism as the first insulating block 310, and the two are symmetrically arranged at both ends of the pole post 200. The overflow portion refers to the flowing adhesive that overflows axially along the mounting hole 110 after the block is compressed. Specifically, the overflow adhesive is controlled by adjusting the compression of the block to fill the gap between the pole post 200 and the hole wall.

[0064] During assembly, when the electrode post 200 is pressed into the mounting hole 110, the first insulating block 310 and the second insulating block 320 are subjected to axial pressure. The two insulating blocks are compressed vertically, causing the material to expand radially, forming a second insulating portion 311 and a third insulating portion 321 that fit tightly against the housing body 100. Simultaneously, the material of the insulating blocks flows out axially, forming a first overflow portion 312 and a second overflow portion 322 surrounding the electrode post 200. The overflowed material contacts and fuses with each other within the mounting hole 110, forming a first insulating portion 330 that continuously wraps around the electrode post 200. The first insulating portion 330 not only seals the assembly gap between the electrode post 200 and the mounting hole 110, but also fills microscopic uneven areas through its self-adaptive properties, absorbing processing errors. In subsequent assembly processes, external forces are dispersed and absorbed by the first insulating portion 330, preventing direct transmission to the connection points between the two sub-electrodes and the PTC thermistor 230. Furthermore, the continuous deformation capability of the two insulating blocks can compensate for the micro-deformation of the structure during subsequent use, maintaining long-term sealing performance.

[0065] In other embodiments, the first insulating part 330, the second insulating part 311, and the third insulating part 321 may be made into separate components, or the first insulating part 330 and the second insulating part 311 may be made into a structure consistent with the state after compression deformation described above. This application does not limit this.

[0066] Specifically, the compression amount of the first insulating block 310 is 45% to 65%, and the compression amount of the second insulating block 320 is 45% to 65%. Compression refers to the percentage reduction in thickness of the insulating block during compression deformation. This can be achieved by controlling the fit between the assembly pressure and the initial dimensions of the insulating block. Limiting the compression range avoids physical damage caused by excessive material deformation. This allows for controllable filling of the insulating blocks during compression deformation, effectively preventing residual gaps at the sealing interface due to insufficient compression and deterioration of material mechanical properties caused by excessive compression, thereby ensuring the integrity of the insulation layer and the long-term connection stability between the pole 200 and the shell body 100.

[0067] The mounting hole 110 can be a round hole, a rectangular hole, or other polygonal holes, and this application does not limit it.

[0068] The following explanation uses a circular mounting hole 110 as an example. The dimensional relationships of the various components and structures are as follows:

[0069] The first insulating block 310 and the second insulating block 320 are designed to have the same size and are collectively referred to as insulating blocks. In their natural state, the insulating blocks are ring-shaped structures with a hollow part.

[0070] For ease of calculation, the pole post 200 is divided into two ends (first end 211 and second end 221) and a columnar portion 200a (formed by connecting the first column 212, the PTC thermistor 230 and the second column 222).

[0071] The diameter of the end is 90% to 95% of the width of the shell body 100, and the thickness of the end is 0.2mm to 0.5mm;

[0072] The diameter of the columnar portion 200a is 25% to 35% of the diameter of the first end 211;

[0073] The outer diameter of the insulating block is the same as the diameter of the end, and the inner diameter of the insulating block is the same as the diameter of the columnar part 200a; the thickness of the insulating block is 0.2mm to 0.5mm.

[0074] The wall thickness of the shell body 100 is 0.1 mm to 1.0 mm, and the inner diameter of the mounting hole 110 is 35% to 45% of the diameter of the end.

[0075] Based on the above dimensional relationship, the achievable amount of adhesive overflow Y of the insulating adhesive block and the amount of adhesive overflow M required to fill the gap between the columnar part 200a and the wall of the mounting hole 110 are calculated.

[0076] The wall thickness of the shell body 100 is 0.6 mm, and the diameter of the mounting hole 110 is 0.95 mm;

[0077] The insulating block has a thickness of 0.2 mm, an outer diameter of 2.7 mm, and a hollow portion diameter of 0.67 mm.

[0078] The amount of adhesive required to fill the wall of the columnar part 200a and the mounting hole 110 is M = (cross-sectional area of ​​mounting hole 110 - cross-sectional area of ​​columnar part 200a) * wall thickness of shell body 100 = [(0.95 / 2)²*π - (0.65 / 2)³*π] * 0.6 = 0.214 mm 3 .

[0079] The amount of adhesive overflow Y of the insulating block = the volume of the insulating block under natural conditions * the amount of compression. As described earlier, the compression rate of the insulating block is 45% to 65%. The minimum compression amount Ymin of the insulating block = [(2.7 / 2)²*π - (0.67 / 2)²*π]*(0.2 + 0.2)*45% = 0.966mm 3The above calculations show that when the wall thickness of the shell body 100 is 0.6 mm, M / Y = 0.214 / 0.966 = 22.15%, which is much less than 50%. This indicates that by controlling the distance between the two ends of the first sub-terminal 210 and the second sub-terminal 220 when they are connected, that is, by controlling the length of the columnar portion 200a, the first overflow portion 312 and the second overflow portion 322 in the compressed state of the two insulating adhesive blocks can completely fill the gap between the columnar portion 200a and the wall of the mounting hole 110.

[0080] Secondly, embodiments of this application also provide a battery, in some embodiments of which the battery includes the casing structure as described above. Thanks to the improvements to the casing structure in the above embodiments, the battery of this application has the same technical effects as the casing structures in the above embodiments, and will not be repeated here.

[0081] The casing structure has an inner cavity, and the battery also includes an electrode assembly disposed within the inner cavity. The electrode assembly's tabs are electrically connected to the portion of the second sub-terminal 220 located within the casing body 100. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and can adopt arrangements commonly used in the art, which will not be described in detail in this application.

[0082] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A shell structure, characterized in that, include: The main body of the shell has mounting holes; The electrode includes a first sub-electrode, a second sub-electrode, and a PTC thermistor. The first sub-electrode has a first end, and the second sub-electrode has a second end. The first end, the PTC thermistor, and the second end are sequentially connected to form a columnar portion, and at least the PTC thermistor is located in the mounting hole. A first insulating part is disposed between the columnar part and the wall of the mounting hole.

2. The shell structure according to claim 1, characterized in that, The portion of the first end extending into the mounting hole has a first connecting surface, and the portion of the second end extending into the mounting hole has a second connecting surface. The first connecting surface and the second connecting surface are mutually parallel planes.

3. The shell structure according to claim 2, characterized in that, Both the first connecting surface and the second connecting surface are perpendicular to the axial direction of the mounting hole.

4. The shell structure according to claim 2, characterized in that, The distance between the first connecting surface and the second connecting surface is 10um to 200um.

5. The shell structure according to claim 2, characterized in that, The PTC thermistor includes a first PTC coating disposed on the first connection surface; or... The PTC thermistor includes a second PTC coating disposed on the second connection surface; or... The first connecting surface is provided with a first PTC coating, and the second connecting surface is provided with a second PTC coating. The first PTC coating and the second PTC coating are connected to form the PTC thermistor.

6. The shell structure according to claim 1, characterized in that, The first sub-pole post includes a first end and a first column, the cross-sectional dimension of the first end is larger than the cross-sectional dimension of the first column; the first end is located outside the shell body, the first column is connected to the side of the first end facing the shell body, and the end of the first column away from the first end forms the first end portion; The second sub-pole post includes a second end and a second column, the cross-sectional dimension of the second end is larger than the cross-sectional dimension of the second column; the second end is located inside the housing body and is used for electrical connection with the tab of the electrode assembly, the second column is connected to the side of the second end facing the housing body, and the end of the second column away from the second end forms the second end portion.

7. The shell structure according to claim 6, characterized in that, The shell structure further includes a second insulating part, which is disposed between the first end and the shell body, and the second insulating part is connected to the first insulating part; The housing structure further includes a third insulating part, which is disposed between the second end and the housing body, and is connected to the first insulating part.

8. The shell structure according to claim 7, characterized in that, The shell structure includes a first insulating block and a second insulating block, wherein the first insulating block is disposed between the first end and the shell body, and the second insulating block is disposed between the second end and the shell body; The first insulating block is configured such that when the first end, the PTC thermistor, and the second end are sequentially connected to form the columnar portion, the first insulating block is compressed and deformed to form the second insulating portion and the first overflow portion connected to the second insulating portion; The second insulating block is configured such that when the first end, the PTC thermistor, and the second end are sequentially connected to form the columnar portion, the second insulating block is compressed and deformed to form the third insulating portion and the second overflow portion connected to the third insulating portion; Both the first overflow portion and the second overflow portion are located between the columnar portion and the wall of the mounting hole, and the first overflow portion and the second overflow portion abut against each other to form the first insulating portion.

9. The shell structure according to claim 8, characterized in that, The compression of the first insulating block is 45% to 65%; and / or the compression of the second insulating block is 45% to 65%.

10. A battery, characterized in that, The battery comprises the housing structure as described in any one of claims 1 to 9.

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