Battery structure and electric equipment

Abstract

The utility model discloses a battery structure and electric equipment, the battery structure comprises a shell, the shell comprises a shell top and a shell side wall which are integrally formed, and a shell opening part is formed at one end of the shell side wall far away from the shell top; the cover body is connected with the shell opening part; the battery cell is arranged in the shell; the pole component is arranged at the top of the shell and is connected with the battery cell; and the insulating part covers the outer side of the battery cell, the insulating part is provided with a first bottom surface close to the shell opening part, and the first bottom surface is in contact with the cover body. According to the battery structure, the cover body is arranged at the shell opening part of the shell, and the pole assembly is arranged at the shell top, so that a bottom supporting plate is not needed, the space is saved, the insulating part can be directly contacted with the cover body after wrapping the battery core, and the energy density of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery structure. Furthermore, this utility model also relates to an electrical device incorporating the aforementioned battery structure. Background Technology

[0002] The square-shell battery includes a casing and a battery cell housed inside the casing. The top of the casing has an opening, and the casing is sealed by a top cover located on top of the battery cell and the opening of the casing.

[0003] In related technologies, the casing is mainly formed by stamping, creating an arc-shaped R-angle at the bottom corner. To prevent interference between the bare battery cell inside the casing and the R-angle, which could damage the electrode plates, a base plate is usually placed under the cell to elevate it. In this method, the base plate occupies the height space of the battery, affecting the overall energy density of the battery.

[0004] In conclusion, how to avoid the impact of the base plate on the overall energy density of the battery is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a battery structure that eliminates the need for a base plate, saving space and avoiding any impact on battery energy density. Another purpose of this utility model is to provide an electrical device that includes the above-described battery structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A battery structure, comprising:

[0008] The shell includes an integrally formed shell top and shell sidewalls, wherein a shell opening is formed at the end of the shell sidewalls away from the shell top;

[0009] The cover body connects to the shell opening;

[0010] The battery cell is located inside the housing;

[0011] The terminal assembly is located on the top of the housing and connected to the battery cell;

[0012] An insulating element is provided, covering the outside of the battery cell, the insulating element having a first bottom surface near the opening of the casing, the first bottom surface being in contact with the cover.

[0013] Preferably, the cover is provided with a mounting hole, and an explosion-proof valve is installed in the mounting hole.

[0014] Preferably, the surface of the cover closest to the battery cell is the inner surface, and the surface of the cover furthest from the battery cell is the outer surface, and the explosion-proof valve is at least partially disposed between the inner surface and the outer surface.

[0015] Preferably, along the direction from the inner surface to the outer surface, the mounting hole includes a countersunk platform and a first through hole connected together, and the explosion-proof valve is disposed in the countersunk platform.

[0016] Preferably, the explosion-proof valve includes an opening area and a fixing part, the fixing part abutting against the recessed platform, and the projection of the opening area along the direction from the inner surface to the outer surface falls into the projection of the first through hole. The distance between the plane b of the opening area near the inner surface and the inner surface is L1, the thickness of the opening area of ​​the explosion-proof valve is h1, and the thickness of the cover is H1, where 0.2mm≤L1≤H1-h1.

[0017] Preferably, the thickness of the fixing part is h2, the distance between the plane a of the sinking platform and the inner surface is H3, the distance between the plane a of the sinking platform and the outer surface is H2, H3=H1-H2, and H3≥h2.

[0018] Preferably, the outer surface has a first annular protrusion protruding from its edge, and the explosion-proof valve is located between the inner surface and the surface of the first annular protrusion.

[0019] Preferably, the outer surface is provided with a second annular protrusion, and the second annular protrusion forms a second through hole communicating with the mounting hole.

[0020] Preferably, an insulating patch is bonded to the outer surface, and the insulating patch is located within the first annular protrusion; the thickness of the insulating patch is B, 0.15mm≤B≤1mm. The height of the first annular protrusion is H4, the height of the second annular protrusion is H5, and the height of the battery cell is H6, H5<H4, 0.3%H6≤H4≤5%H6.

[0021] Preferably, the outer surface is bonded with an insulating patch, which is located within the first annular protrusion; the thickness of the insulating patch is B, 0.15mm≤B≤1mm.

[0022] Preferably, the area on the first bottom surface corresponding to the explosion-proof valve is a weak area, the thickness of the weak area is C, the thickness of the insulating component is A, 0.1A≤C≤0.7A, 0.02≤A≤0.5mm;

[0023] And / or, the area of ​​the weak zone is S7, the area of ​​the valve opening area of ​​the explosion-proof valve is S2, and 0.5≤S7 / S2≤2.

[0024] Preferably, the area on the first bottom surface corresponding to the explosion-proof valve is provided with etched lines.

[0025] Preferably, a vent hole is provided on the first bottom surface, and a plurality of vent holes are arranged opposite to the explosion-proof valve. The sum of the areas of the plurality of vent holes is S6, and the total area of ​​the explosion-proof valve is S4, where 1.5≤S4 / S6≤5.

[0026] Preferably, an insulating adhesive tape is provided on the side of the explosion-proof valve near the inner surface, the area of ​​the insulating adhesive tape is S3, the area of ​​the inner surface is S5, the total area of ​​the explosion-proof valve is S4, and 1.2 ≤ S3 / S4 ≤ 5, where S3 <S5。

[0027] Preferably, the projected area of ​​the battery cell on the outer surface is S1, the area of ​​the opening region of the explosion-proof valve is S2, and 3≤S1 / S2≤10.

[0028] Preferably, the explosion-proof valve is integrally formed with the cover;

[0029] Alternatively, the explosion-proof valve is connected to the cover.

[0030] This utility model also provides an electrical device, including the battery structure described in any of the above claims.

[0031] The battery structure provided by this utility model includes a housing, which includes an integrally formed top and sidewalls. The sidewalls have an opening at one end away from the top. The battery cell is disposed inside the housing and is connected to the opening via a cover to seal the battery cell inside the housing. The terminal assembly is disposed on the top of the housing and connected to the battery cell to conduct current from the battery cell. An R-angle is formed on the top of the housing. Therefore, the insulating component covers the outside of the battery cell and the first bottom surface near the opening can directly contact the cover, eliminating the need for a bottom support plate and saving battery height space, thus improving the overall energy density of the battery.

[0032] The beneficial effects of this utility model are as follows: by connecting the shell opening of the housing through the cover, after the insulating part is covered on the outside of the cell, its first bottom surface near the shell opening can directly contact the cover, eliminating the need for a bottom support plate, reducing space occupation, and improving battery energy density. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1A schematic diagram of the battery structure provided by this utility model;

[0035] Figure 2 for Figure 1 Side view;

[0036] Figure 3 for Figure 1 A partial exploded view;

[0037] Figure 4 for Figure 1 Another exploded view of the area;

[0038] Figure 5 for Figure 1 Overall exploded view;

[0039] Figure 6 for Figure 1 The front view;

[0040] Figure 7 for Figure 6 DD section view;

[0041] Figure 8 A schematic diagram of an insulating component provided by this utility model;

[0042] Figure 9 Another schematic diagram of the insulating component provided by this utility model;

[0043] Figure 10 This is a schematic diagram of the structure of the cover provided by this utility model;

[0044] Figure 11 This is a schematic diagram of the structure of the explosion-proof valve provided by this utility model;

[0045] Figure 12 for Figure 11 EE-directed sectional view.

[0046] Figures 1-12 In the accompanying drawings, the reference numerals include:

[0047] 1-Shell; 2-Pole assembly; 3-Cover; 4-Explosion-proof valve; 5-Insulating component; 6-Insulating tape; 101-Shell opening; 102-Shell top; 103-First annular protrusion; 104-Injection port; 105-First pole mounting hole; 106-Second pole mounting hole; 107-Shell sidewall; 108-Second annular protrusion; 301-Inner surface; 302-Outer surface; 303-Sunken platform; 304-Mounting hole; 401-Score; 501-Ventilation hole; 502-Score line; 503-Weak area; 504-First bottom surface. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0049] The core of this invention is to provide a battery structure in which the insulating component, after being attached to the battery cell, can directly contact the cover, eliminating the need for a base plate, saving space, and increasing battery energy density. Another core aspect of this invention is to provide an electrical device incorporating the aforementioned battery structure.

[0050] The battery structure provided by this utility model is specifically a square-shell battery, including a shell 1, a cover 3, a battery cell, an electrode assembly 2, and an insulating component 5. Please refer to [reference needed]. Figure 1 , Figure 2 , Figure 3 , Figure 4 .

[0051] The shell 1 includes an integrally formed shell top 102 and shell sidewalls 107, wherein a shell opening 101 is formed at the end of the shell sidewalls 107 away from the shell top 102. The integral forming specifically means that the shell 1 is formed by stamping. The cover 3 is connected to the shell opening 101, specifically by welding the shell opening 101 and the cover 3 to seal the cover 3 and the shell 1 relative to each other.

[0052] The battery cell is housed inside the housing 1 and can be inserted or removed from the housing opening 101. The terminal assembly 2 is located at the top 102 of the housing and is connected to the battery cell. Specifically, the positive and negative tabs of the battery cell extend to the top 102 of the housing and are connected to the terminal assembly 2. There are two terminal assemblies 2, one for positive polarity and the other for negative polarity.

[0053] The cover 3 is connected to the shell opening 101. In this connection method, the R-angle will be formed at the connection position between the top 102 of the shell and the side wall 107 of the shell. The shell opening 101 will not form an interference R-angle. Therefore, there is no need to set a bottom support plate. After the insulating member 5 used for insulation between the cell and the shell 1 is covered on the outside of the cell, the insulating member 5 can directly contact the first bottom surface 504 of the shell opening 101 and the cover 3, eliminating the need for a bottom support plate, saving space, not occupying the height space of the battery, and improving the energy density of the battery.

[0054] The R-angle in the above process specifically refers to the arc-shaped R-angle formed by stamping the shell 1 at the connection position between the top 102 of the shell and the side wall 107 of the shell, such as... Figure 1 and Figure 3As shown. Based on the R-angle formed at the connection position between the top of the shell 102 and the side wall of the shell 107, the pole assembly 2 is provided on the top of the shell 102 and connected to the cell to conduct the cell current.

[0055] In one specific implementation, the terminal assembly can be arranged using the height space formed by the radius (R). For example, the lower plastic part of the terminal assembly, the connecting piece, and other components can be directly set using the R-angle space to improve space utilization and increase battery energy density.

[0056] The insulating component 5 in the above process can protect the battery cell from short circuits and improve the safety of use. Specifically, it can be a Mylar membrane, which covers the outside of the battery cell to separate the battery cell from the casing 1.

[0057] Based on the above embodiment, the thickness of the insulating element 5 is A, where 0.02≤A≤0.5mm.

[0058] The thickness of the insulating component 5 is set to be greater than 0.02 mm to ensure the insulation performance and structural strength of the insulating component 5; the thickness of the insulating component 5 is set to be less than 0.5 mm to avoid the insulating component 5 occupying a large space in the housing 1 and to ensure the energy density of the battery.

[0059] The material of the insulating component 5 can be PP or PET, PP, polypropylene, PET, polyethylene terephthalate.

[0060] If the insulating part 5 is made of PP material, it is preferred that 0.05≤A≤0.3mm; if the insulating part 5 is made of PET material, it is preferred that 0.02≤A≤0.1mm.

[0061] The surface of the insulating component 5 near the battery cell is provided with adhesive, so that the insulating component 5 is attached to the circumference of the battery cell. The insulating component 5 isolates the battery cell from the housing 1, avoiding direct contact and short circuit, and ensuring safety in use.

[0062] Based on any of the above embodiments, the cover 3 is provided with a mounting hole 304, and an explosion-proof valve 4 is provided in the mounting hole 304.

[0063] Please refer to Figure 3 The top 102 of the shell is also provided with an injection port 104 for injecting electrolyte. Electrolyte is injected into the shell 1 through the injection port 104 to wet the battery cell.

[0064] In this embodiment, the explosion-proof valve 4 is located on the cover 3 connecting the housing opening 101, while the terminal assembly 2 is located on the top 102 of the housing. The explosion-proof valve 4 and the terminal assembly 2 are positioned opposite each other on different planes, achieving thermoelectric separation. During battery use, if thermal runaway occurs, the explosion-proof valve 4 opens under the action of high-temperature, high-pressure gas. Gas and electrolyte are ejected from the cover 3, preventing them from reaching the terminal assembly 2 at the other end. This avoids secondary hazards such as arcing and short circuits, reduces the impact of thermal runaway on the overall electrical safety of the battery, and ensures safe use.

[0065] Based on any of the above embodiments, the surface of the cover 3 near the shell opening 101 is the inner surface 301, and the surface of the cover 3 away from the shell opening 101 is the outer surface 302, such as... Figure 3 The cover 3 is a plate structure, and the cover 3 is fitted and welded together with the shell opening 101.

[0066] The explosion-proof valve 4 is at least partially located between the inner surface 301 and the outer surface 302. That is, the explosion-proof valve 4 can be entirely located between the inner surface 301 and the outer surface 302, or a portion of it can be located between the inner surface 301 and the outer surface 302. However, it should be noted that at least the surface of the explosion-proof valve 4 near the shell opening 101 is located between the inner surface 301 and the outer surface 302, and cannot extend beyond the inner surface 301 so as not to interfere with the contact between the inner surface 301 of the cover 3 and the insulating member 5.

[0067] Based on any of the above embodiments, please refer to Figure 6 , Figure 7 Along the direction from the inner surface 301 to the outer surface 302, the mounting hole 304 includes a countersunk platform 303 and a first through hole. The explosion-proof valve 4 is disposed within the countersunk platform 303 and is reliably installed by being supported by the countersunk platform 303. The direction along the inner surface 301 to the outer surface 302 is as follows: Figure 7 The meaning is as shown.

[0068] Based on any of the above embodiments, the explosion-proof valve 4 includes an opening region and a fixing part. The opening region is the area where the explosion-proof valve 4 opens under the action of high-temperature and high-pressure gas, allowing gas and electrolyte to be ejected. The fixing part abuts against the countertop 303 to form a fixed installation of the explosion-proof valve 4. Along the direction from the inner surface 301 to the outer surface 302, the projection of the opening region falls into the projection of the first through hole to ensure the pressure relief effect of the explosion-proof valve 4. The direction from the inner surface 301 to the outer surface 302 is as follows: Figure 7 The meaning is as shown.

[0069] The distance between the plane b near the inner surface 301 of the valve opening area and the inner surface 301 is L1, the thickness of the valve opening area of ​​the explosion-proof valve 4 is h1, and the thickness of the cover 3 is H1. 0.2mm≤L1≤H1-h1.

[0070] Specifically, 0.2mm ≤ L1 is used to prevent interference between the explosion-proof valve 4 and the internal battery cell of the housing 1, which could cause unstable valve opening. This creates a certain distance between the inner surface b and the inner surface 301 of the valve opening area, facilitating the formation of a venting and depressurization channel in case of thermal runaway, improving the depressurization rate, and ensuring the reliability of the explosion-proof valve 4. L1 ≤ H1-h1 is used to prevent the surface of the explosion-proof valve 4 near the housing opening 101 from protruding under stress, which could cause abnormal valve opening and ensure the reliability of the explosion-proof valve 4.

[0071] In one specific embodiment, 0.4mm≤L1≤H1-h1-0.5mm, H1≥0.8mm, to ensure that the cover 3 has a certain structural strength, to ensure the strength of the weld between the shell 1 and the cover 3, and to improve the stability of the explosion-proof valve 4 during explosion.

[0072] Based on any of the above embodiments, the thickness of the fixing part is h2, the distance between the plane a of the recessed platform 303 and the inner surface 301 is H3, the distance between the plane a of the recessed platform 303 and the outer surface 302 is H2, H3=H1-H2, H3≥h2.

[0073] Please refer to Figure 7 The thickness of the fixing part of the explosion-proof valve 4 is h2, the distance between the plane a of the recessed platform 303 and the inner surface 301 is H3, the distance between the plane a of the recessed platform 303 and the outer surface 302 is H2, H3=H1-H2, H3≥h2. Wherein, as... Figure 7 The thickness of the opening area of ​​the explosion-proof valve 4 is h1, and the thickness of the cover 3 is H1. The specific thickness direction here is... Figure 7 The z-axis indicates the direction. Figure 7 The z-axis is essentially the height direction of the battery, while the x-axis is the length direction of the battery, and the y-axis is the width direction of the battery.

[0074] In one specific embodiment, H3 > 0.5 mm, to prevent the battery cell and insulation 5 from deforming and coming into contact with the explosion-proof valve 4 under the action of electrolyte and pressure, to ensure the distance between the plane a and the inner surface 301 of the sink 303, to ensure the burst value of the explosion-proof valve 4, and to ensure the pressure relief effect.

[0075] Based on any of the above embodiments, please refer to Figure 10 The outer surface 302 has a first annular protrusion 103 protruding from its edge, and the explosion-proof valve 4 is located between the inner surface 301 and the surface of the first annular protrusion 103.

[0076] The first annular protrusion 103 enhances the strength of the cover 3, facilitating rapid pressure relief and venting through the explosion-proof valve 4 in case of battery failure, thus improving safety. Furthermore, due to the presence of the first annular protrusion 103, it contacts the placement surface during battery placement or transport, preventing the explosion-proof valve 4 from being impacted or subjected to stress, and preventing impurities from entering the explosion-proof valve 4, thereby ensuring its reliable safety performance and service life.

[0077] The explosion-proof valve 4 is located between the inner surface 301 and the surface of the first annular protrusion 103. The first annular protrusion 103 acts as a reinforcing rib, ensuring the strength of the cover 3, protecting the explosion-proof valve 4, providing working space, facilitating the smooth opening of the explosion-proof valve 4, venting and draining liquid, and ensuring safety.

[0078] Based on any of the above embodiments, please refer to Figure 10 The outer surface 302 has a protruding second annular protrusion 108, which forms a second through hole communicating with the mounting hole 304. In this case, the explosion-proof valve 4 is located between the surface of the second annular protrusion 108 and the inner surface 301. By providing the second annular protrusion 108, the structural strength of the area on the cover 3 connected to the explosion-proof valve 4 can be improved, ensuring the reliable installation of the explosion-proof valve 4. Specifically, the protrusion height of the second annular protrusion 108 does not exceed the bottom surface of the cover 3 away from the shell opening 101, ensuring the stability of the entire battery.

[0079] Based on any of the above embodiments, please refer to Figure 10 The height of the first annular protrusion 103 is H4, the height of the second annular protrusion 108 is H5, and the height of the battery cell is H6, where H5 < H4, and 0.3%H6 ≤ H4 ≤ 5%H6. The specific height direction is as follows: Figure 10 The meaning is indicated by the z-direction. And... Figure 10 The z-axis is essentially the height direction of the battery, while the x-axis is the length direction of the battery, and the y-axis is the width direction of the battery.

[0080] In one specific embodiment, 0.5%H6≤H4≤2%H6, and 0.5mm≤H4≤3mm. 0.5mm≤H4 ensures the beneficial effects of the first annular protrusion 103; H4≤3mm reduces the impact of the first annular protrusion 103 on the battery energy density, ensuring both the beneficial effects of the first annular protrusion 103 and the battery energy density.

[0081] Based on any of the above embodiments, please refer to Figure 10An insulating patch is provided on the outer surface 302, and the insulating patch is located inside the first annular protrusion 103. The insulating patch provides insulation to ensure the insulation of the cover 3. The first annular protrusion 103 provides a limiting and protective effect for the insulating patch, preventing the insulating patch from wearing off and ensuring reliable adhesion between the insulating patch and the outer surface 302.

[0082] The thickness of the insulating patch is B, 0.15≤B≤1mm, to ensure the strength and insulation performance of the insulating patch, while avoiding excessive cost and occupying too much height space, and ensuring the energy density of the battery.

[0083] Based on any of the above embodiments, please refer to Figure 8 The area corresponding to the insulating component 5 and the explosion-proof valve 4 is the weak area 503. The weak area 503 is relatively weaker than other areas of the insulating component 5, and is more likely to burst open under high pressure and high temperature to ensure exhaust and pressure relief.

[0084] Taking a weaker implementation method, the thickness of the weak area 503 can be changed by stamping as an example. In this case, the thickness of the weak area 503 is C, and the thickness of the insulating part 5 is A, 0.1A≤C≤0.7A, to ensure that the weak part has a certain strength, and at the same time to ensure that the weak area 503 can burst open when the battery valve is opened, to ensure venting and pressure relief, and to ensure safety.

[0085] In one specific embodiment, the area of ​​the weak zone 503 is S7, and the area of ​​the opening region of the explosion-proof valve 4 is S2, where 0.5 ≤ S7 / S2 ≤ 2. Please refer to [reference needed]. Figure 11 , Figure 12 The opening area of ​​the explosion-proof valve 4 refers to the area within the groove 401 on the explosion-proof valve 4. By limiting 0.5≤S7 / S2≤2, the pressure relief effect is ensured while ensuring that the weak area 503 is easy to burst open, avoiding secondary short circuits caused by contact between the battery cell and the cover 3, thus ensuring safety.

[0086] Based on any of the above embodiments, a scribe line 502 is provided in the area corresponding to the explosion-proof valve 4 on the first bottom surface 504. The scribe line 502 here can be a dotted line formed by processing, so as to ensure that when the battery valve is opened, it can burst open from the scribe line 502 to ensure venting and pressure relief, and ensure safety.

[0087] Based on any of the above embodiments, please refer to Figure 9, vent holes 501 are provided on the first bottom surface 504. A plurality of vent holes 501 are arranged opposite to the explosion-proof valve 4. The sum of the areas of the plurality of vent holes 501 is S6, and the total area of the explosion-proof valve 4 is S4, where 1.5 ≤ S4 / S6 ≤ 5. The specific shape of the vent holes 501 is not limited and can be circular, square or other irregular shapes. By providing the vent holes 501, it is convenient for the electrolyte to flow in the housing 1 and better infiltrate the battery cell, and when the battery is abnormal, it can burst and relieve pressure better, improving the rate of pressure relief.

[0088] A plurality of vent holes 501 are arranged opposite to the valve opening area of the explosion-proof valve 4. The area of the plurality of vent holes 501 is S6, and the total area of the explosion-proof valve 4 is S4, where 1.5 ≤ S4 / S6 ≤ 5, ensuring the pressure relief effect after the explosion-proof valve 4 bursts, avoiding the contact between the insulating part 5 and the explosion-proof valve 4 under the action of pressure, ensuring the reliable operation effect of the explosion-proof valve 4, and ensuring safety.

[0089] Based on any of the above embodiments, please refer to Figure 4 , Figure 5 , an insulating adhesive tape 6 is provided on the side of the explosion-proof valve 4 close to the inner surface 301. The area of the insulating adhesive tape 6 is S3, the area of the inner surface 301 is S5, and the total area of the explosion-proof valve 4 is S4, where 1.2 ≤ S3 / S4 ≤ 5, and S3 < S5.

[0090] An insulating adhesive tape 6 is provided on the side of the explosion-proof valve 4 close to the inner surface 301. The insulating adhesive tape 6 is adhered to the plane of the explosion-proof valve 4 close to the housing opening 101 and the inner surface 301, preventing the electrolyte from corroding the explosion-proof valve 4 and the weld between the explosion-proof valve 4 and the housing 1, and being able to protect the explosion-proof valve 4, avoiding direct contact with the electrolyte and the insulating part 5, and improving the stability of the bursting value of the explosion-proof valve 4.

[0091] The area of the insulating adhesive tape 6 is S3, the area of the inner surface 301 is S5, and the total area of the explosion-proof valve 4 is S4, where 1.2 ≤ S3 / S4 ≤ 5, and S3 < S5. The insulating adhesive tape 6 completely covers the explosion-proof valve 4, ensuring a reliable protection effect.

[0092] Based on any of the above embodiments, the projected area of the battery cell on the outer surface 302 is S1, and the area of the valve opening area of the explosion-proof valve 4 is S2, where 3 ≤ S1 / S2 ≤ 10. By restricting the ratio of S1 and S2, the reliable operation effect of the explosion-proof valve 4 is ensured, and reliable pressure relief is ensured.

[0093] Based on any of the above embodiments, the explosion-proof valve 4 and the cover body 3 are integrally formed, which is simple to process and ensures the overall structural strength.

[0094] Based on any of the above embodiments, the explosion-proof valve 4 is connected to the cover 3. Specifically, after the explosion-proof valve 4 and the cover 3 are processed separately, they are welded together, which can also ensure good overall structural strength.

[0095] Based on any of the above embodiments, the top 102 of the shell is provided with a first pole mounting hole 105 and a second pole mounting hole 106, and two pole assembly 2 with opposite polarities are respectively connected to the first pole mounting hole 105 and the second pole mounting hole 106. The first pole mounting hole 105 and the second pole mounting hole 106 can be circular, elliptical, or polygonal, preferably rectangular and circular.

[0096] Taking one specific embodiment as an example, the electrode assembly 2 includes an upper plastic, a lower plastic, a sealing ring, a substrate, and a connecting piece. The electrode is divided into an upper electrode part and a lower electrode part. The upper surface of the connecting piece is welded to the lower electrode part, and the lower surface of the connecting piece is welded to the battery cell tab. After the lower plastic and the sealing ring are fitted onto the lower electrode part, the electrode passes through the through hole of the substrate and the upper plastic. The upper plastic is riveted / welded to the upper electrode part or riveted and then welded. The through hole of the substrate can be circular, polygonal, rectangular, racetrack-shaped, etc. The outer edge shape of the substrate corresponds to the first electrode mounting hole 105 and the second electrode mounting hole 106 of the housing 1.

[0097] Specifically, the first pole mounting hole 105 and the second pole mounting hole 106 have the same shape as the outer edge of the substrate of the pole assembly 2. The substrate is inserted into the first pole mounting hole 105 or the second pole mounting hole 106, with the geometric center coinciding. The side of the substrate is bonded to the inner wall of the first pole mounting hole 105 or the second pole mounting hole 106.

[0098] In one specific embodiment, both the first electrode mounting hole 105 and the second electrode mounting hole 106 are provided with a countersunk portion. Excluding the countersunk portion, the thickness of the top of the shell 102 in the thickness direction is greater than 1 / 5 of the thickness of the top of the shell 102, ensuring the structural strength of the countersunk portion. Furthermore, to reduce the processing difficulty of the countersunk portion of the shell 1, ensure strength, and reduce costs, the distance between the sidewall of the countersunk portion and the sidewall of the electrode mounting hole is less than 10mm and greater than 0.3mm.

[0099] In addition to the battery structure described above, this utility model also provides an electrical device that includes the battery structure disclosed in the above embodiments. This electrical device can be any device that can use the prismatic battery provided by this utility model, and there is no limitation on the specific type of device.

[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0101] The battery structure and electrical device provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A battery structure, characterized in that, include: The shell (1) includes an integrally formed shell top (102) and shell sidewall (107), wherein a shell opening (101) is formed at one end of the shell sidewall (107) away from the shell top (102). Cover (3), connected to the shell opening (101); The battery cell is disposed inside the housing (1); The terminal assembly (2) is located on the top of the housing (102) and connected to the battery cell; An insulating element (5) is wrapped around the outside of the battery cell. The insulating element (5) has a first bottom surface (504) near the opening of the casing (101). The first bottom surface (504) is in contact with the cover (3).

2. The battery structure according to claim 1, characterized in that, The cover (3) is provided with a mounting hole (304), and an explosion-proof valve (4) is provided in the mounting hole (304).

3. The battery structure according to claim 2, characterized in that, The surface of the cover (3) near the battery cell is the inner surface (301), and the surface of the cover (3) away from the battery cell is the outer surface (302). The explosion-proof valve (4) is at least partially located between the inner surface (301) and the outer surface (302).

4. The battery structure according to claim 3, characterized in that, Along the direction from the inner surface (301) to the outer surface (302), the mounting hole (304) includes a countersunk platform (303) and a first through hole connected together, and the explosion-proof valve (4) is disposed in the countersunk platform (303).

5. The battery structure according to claim 4, characterized in that, The explosion-proof valve (4) includes an opening area and a fixing part. The fixing part abuts against the sink (303). Along the direction from the inner surface (301) to the outer surface (302), the projection of the opening area falls into the projection of the first through hole. The distance between the plane b of the opening area near the inner surface (301) and the inner surface (301) is L1. The thickness of the opening area of ​​the explosion-proof valve (4) is h1. The thickness of the cover (3) is H1. 0.2mm≤L1≤H1-h1.

6. The battery structure according to claim 5, characterized in that, The thickness of the fixing part is h2, the distance between the plane a of the sinking platform (303) and the inner surface (301) is H3, the distance between the plane a of the sinking platform (303) and the outer surface (302) is H2, H3=H1-H2, H3≥h2.

7. The battery structure according to claim 3, characterized in that, The outer surface (302) has a first annular protrusion (103) protruding from its edge, and the explosion-proof valve (4) is located between the inner surface (301) and the surface of the first annular protrusion (103).

8. The battery structure according to claim 7, characterized in that, The outer surface (302) is provided with a second annular protrusion (108), and the second annular protrusion (108) forms a second through hole communicating with the mounting hole (304).

9. The battery structure according to claim 8, characterized in that, The height of the first annular protrusion (103) is H4, the height of the second annular protrusion (108) is H5, the height of the battery cell is H6, H5 < H4, 0.3%H6 ≤ H4 ≤ 5%H6.

10. The battery structure according to claim 9, characterized in that, An insulating patch is attached to the outer surface (302), and the insulating patch is located inside the first annular protrusion (103); the thickness of the insulating patch is B, 0.15mm≤B≤1mm.

11. The battery structure according to claim 2, characterized in that, The area corresponding to the first bottom surface (504) and the explosion-proof valve (4) is a weak area (503), the thickness of the weak area is C, the thickness of the insulating component (5) is A, 0.1A≤C≤0.7A, 0.02≤A≤0.5mm; And / or, the area of ​​the weak zone (503) is S7, the area of ​​the opening region of the explosion-proof valve (4) is S2, and 0.5≤S7 / S2≤2.

12. The battery structure according to claim 2, characterized in that, The area corresponding to the first bottom surface (504) and the explosion-proof valve (4) is provided with a etched line (502).

13. The battery structure according to claim 2, characterized in that, A ventilation hole (501) is provided on the first bottom surface (504). Several ventilation holes (501) are arranged opposite to the explosion-proof valve (4). The sum of the areas of several ventilation holes (501) is S6, and the total area of ​​the explosion-proof valve (4) is S4. 1.5≤S4 / S6≤5.

14. The battery structure according to any one of claims 3 to 13, characterized in that, An insulating tape (6) is provided on the side of the explosion-proof valve (4) near the inner surface (301). The area of ​​the insulating tape (6) is S3, the area of ​​the inner surface (301) is S5, and the total area of ​​the explosion-proof valve (4) is S4. 1.2 ≤ S3 / S4 ≤ 5, S3 <S5。 15. The battery structure according to claim 14, characterized in that, The projected area of ​​the battery cell on the outer surface (302) is S1, and the area of ​​the opening region of the explosion-proof valve (4) is S2, 3≤S1 / S2≤10.

16. The battery structure according to claim 15, characterized in that, The explosion-proof valve (4) is integrally formed with the cover (3); Alternatively, the explosion-proof valve (4) is connected to the cover (3).

17. An electrical appliance, characterized in that, Includes the battery structure described in any one of claims 1 to 16.

Images