Battery casing and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery casing and a battery. The battery casing includes a casing assembly, a protective bracket, and an explosion-proof valve. The casing assembly includes a casing body and a cover plate body. The casing body and / or the cover plate body have mounting through holes. The protective bracket is located at the mounting through hole on the casing body or the cover plate body. The protective bracket has an exhaust structure communicating with the mounting through hole. The effective area of ​​the exhaust structure for gas flow is F. The explosion-proof valve is located in the mounting through hole, and the effective area of ​​the explosion-proof valve for releasing pressurized gas is S1, satisfying that F > 1.2S1. In the event of thermal runaway causing the insulating components to melt, the protective bracket not only supports and fixes the electrode assembly but also ensures that the exhaust structure meets the exhaust requirements of the explosion-proof valve by limiting the effective area F of the exhaust structure on the protective bracket, thus exhibiting high safety performance.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery casing and a battery. Background Technology

[0002] Traditional blade batteries are typically designed with tabs on both sides. Their structure includes: a cover plate (integrating terminals, explosion-proof valves, and electrolyte filling holes), a casing, electrode assembly, and electrolyte. The cover plate and casing are welded together to form a sealed space with sufficient mechanical strength to protect the electrode assembly. The electrode assembly is electrically connected to the cover plate's terminal base via laser welding through the tabs on both sides. The length of the cell is primarily secured by insulating material pressed against the electrode assembly by the cover plate. The cover plate integrates an explosion-proof valve structure, mainly used for the directional release of high-temperature, high-pressure gases inside the battery in the event of thermal runaway due to an internal short circuit, thus improving battery safety.

[0003] The insulating components used for insulation and fixing of the electrode assembly are generally made of PP material, which has very limited strength and high-temperature resistance. When the temperature reaches about 150 degrees Celsius, the insulating components that fix the electrode assembly will melt due to the high temperature. The temperature at which the battery cell experiences thermal runaway is usually much higher than the melting point of these insulating materials. Therefore, once thermal runaway occurs, the melting of the insulating components will prevent the electrode assembly from being effectively fixed, causing the electrode assembly to move inside the casing. This can lead to the electrode assembly blocking the exhaust passage of the explosion-proof valve, greatly reducing the exhaust effect of the explosion-proof valve in the event of thermal runaway, and thus causing adverse problems such as explosions. Its safety in use is poor. Summary of the Invention

[0004] The purpose of this invention is to provide a battery casing and battery that improves the situation of electrode blockage and explosion-proof valve, and has a higher safety in use.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On one hand, a battery housing is provided, the battery housing comprising:

[0007] A housing assembly, comprising an outer shell body and a cover plate body, the outer shell body having at least one opening, the cover plate body corresponding one-to-one with the opening of the outer shell body and closing the opening of the outer shell body to form a receiving cavity for accommodating an electrode assembly, the outer shell body and / or the cover plate body having a mounting through hole communicating with the receiving cavity;

[0008] A protective bracket is disposed within the receiving cavity and mounted on the outer shell body or the cover plate body where the mounting through hole is provided. The protective bracket is provided with an exhaust structure for connecting the mounting through hole and the receiving cavity. The effective area of ​​the exhaust structure for gas flow is F.

[0009] An explosion-proof valve is disposed in the mounting through hole and is used to release the pressurized gas inside the receiving cavity. The effective area of ​​the explosion-proof valve for releasing the pressurized gas is S1, and satisfies that F > 1.2S1.

[0010] Optionally, the length of the protective bracket along the first direction is L, and the length of the explosion-proof valve along the first direction is A, and LA > 3mm.

[0011] Optionally, the width dimension of the cover plate body or the outer shell body with the mounting through hole along the first direction is H, and HL > 3mm.

[0012] Optionally, the width dimension of the protective bracket along the second direction is W, and the width dimension of the explosion-proof valve along the second direction is B, and WB > 3mm.

[0013] Optionally, the exhaust structure includes a first exhaust channel, and the protective bracket includes a support plate and a plurality of connecting seats. One end of the plurality of connecting seats is connected to the cover plate body or the outer shell body, and the support plate is connected to the other end of the plurality of connecting seats to form the first exhaust channel between the support plate and the cover plate body or the outer shell body.

[0014] Optionally, the exhaust structure further includes a second exhaust channel, and an exhaust hole penetrating the support plate is provided on the support plate to form the second exhaust channel.

[0015] Optionally, the protective bracket further includes at least one reinforcing rib, and at least one of the reinforcing ribs is disposed in the vent hole.

[0016] Optionally, the connecting seat includes a connecting part and a fixing part, the connecting part being vertically connected to the support plate, and the fixing part being connected to the other end of the connecting part and parallel to the support plate.

[0017] Optionally, a plurality of the connecting seats are symmetrically distributed on both sides of the support plate along the second direction.

[0018] On the other hand, a battery is provided, the battery including an electrode assembly and a battery housing as described in any of the preceding claims, the electrode assembly being disposed within the battery housing.

[0019] The beneficial effects of this invention are:

[0020] This invention provides a battery casing that utilizes a protective bracket located within the housing cavity at a mounting through-hole in the casing body and / or the cover body. This protective bracket protects the explosion-proof valve. In the event of thermal runaway, even if the insulating components melt, the protective bracket can still support and fix the electrode assembly, preventing the electrode assembly from blocking the explosion-proof valve's exhaust passage due to free movement. Furthermore, the invention limits the relationship between the effective area F of the exhaust structure on the protective bracket for gas flow and the effective area S1 of the explosion-proof valve for releasing pressurized gas, ensuring that F > 1.2S1. This guarantees that the exhaust structure on the protective bracket meets the exhaust requirements and effectiveness of the explosion-proof valve, thus providing high safety performance.

[0021] The present invention also provides a battery that, by applying the above-mentioned battery casing, ensures a relatively high venting efficiency in the event of thermal runaway, allowing the pressurized gas to be released rapidly during thermal runaway, reducing the risk factor during thermal runaway, and improving the safety performance of the product. Attached Figure Description

[0022] Figure 1 This is an assembly diagram of the protective bracket and cover plate body in the battery casing provided by the present invention;

[0023] Figure 2 This is an exploded view of the structure between the protective bracket, the explosion-proof valve, and the cover plate body in the battery casing provided by the present invention;

[0024] Figure 3 This is a plan view of the battery casing after the protective bracket and the cover plate body are assembled, as provided by the present invention.

[0025] Figure 4 This is a schematic diagram of the planar structure of the protective bracket in the battery casing provided by the present invention;

[0026] Figure 5 This is a three-dimensional isometric view of the protective bracket in the battery casing provided by the present invention.

[0027] In the picture:

[0028] 1. Cover plate body; 11. Mounting through hole;

[0029] 2. Protective bracket; 21. Exhaust structure; 211. First exhaust channel; 212. Second exhaust channel; 22. Support plate; 221. Exhaust hole; 23. Connecting seat; 231. Connecting part; 232. Fixing part; 24. Reinforcing rib;

[0030] 3. Explosion-proof valve. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0032] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0035] In the event of thermal runaway, the insulating components used to fix the electrode assembly will melt due to high temperature, thus failing to effectively fix the electrode assembly. This causes the electrode assembly to move inside the housing during thermal runaway, which in turn blocks the exhaust passage of the explosion-proof valve, resulting in a significant reduction in exhaust effect, inability to achieve rapid pressure reduction, and reduced safety during use.

[0036] Therefore, in order to prevent the electrode assembly from blocking the exhaust passage of the explosion-proof valve due to free movement in the event of thermal runaway, and to ensure the exhaust effect and improve the safety of use, this embodiment provides a battery casing.

[0037] like Figures 1 to 5As shown, the battery casing includes a casing assembly, a protective bracket 2, and an explosion-proof valve 3. The casing assembly includes a casing body and a cover plate body 1. The casing body has at least one opening. The cover plate body 1 corresponds one-to-one with the opening of the casing body and closes the opening of the casing body to form a receiving cavity for accommodating the electrode assembly. The casing body and / or the cover plate body 1 have a mounting through hole 11 communicating with the receiving cavity. The protective bracket 2 is located in the receiving cavity and is mounted on the casing body and / or the cover plate body 1 has a mounting through hole 11. The protective bracket 2 has an exhaust structure 21 for communicating with the mounting through hole 11 and the receiving cavity. The effective area of ​​the exhaust structure 21 for gas flow is F. The explosion-proof valve 3 is located in the mounting through hole 11 and is used to release the pressurized gas inside the receiving cavity. The effective area of ​​the explosion-proof valve 3 for releasing pressurized gas is S1, and satisfies that F > 1.2S1.

[0038] The battery casing uses a protective bracket 2 located within the housing cavity at the mounting through-hole 11 on the casing body and / or the cover body 1. This protective bracket 2 protects the explosion-proof valve 3. In the event of thermal runaway, even if the insulating components melt due to heat, the protective bracket 2 can still support and fix the electrode assembly, preventing the electrode assembly from blocking the exhaust passage of the explosion-proof valve 3 due to free movement. Furthermore, the effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow and the effective area S1 of the explosion-proof valve 3 for releasing pressurized gas are limited to ensure that F > 1.2S1. This ensures that the exhaust structure 21 on the protective bracket 2 meets the exhaust requirements of the explosion-proof valve 3 and the exhaust effect of the explosion-proof valve 3, thus providing high safety performance.

[0039] The battery casing can be adapted to different types of batteries, such as blade batteries or prismatic batteries. In addition, the battery casing can be configured into various structures of blade batteries or prismatic batteries by the number of openings in the casing body and the number of cover bodies 1. For example, a blade battery with a double-sided open casing body and double cover bodies 1, or a blade battery with a single-sided open casing body and single cover body 1, or a prismatic battery with a single-sided open casing body and single cover body 1, etc. The mounting through hole 11 can be set on the casing body alone, or on the cover body 1 alone, or on both the cover body 1 and the casing body. In this embodiment, the battery casing is specifically structured as a blade battery casing consisting of a double-sided open casing body and a double-cover plate body 1. Mounting through holes 11 are formed on the cover plate body 1, while the casing body does not have mounting through holes 11. Therefore, the protective bracket 2 is disposed on the cover plate body 1. The protective bracket 2 and the cover plate body 1 can be manufactured separately and then connected, or they can be manufactured using an integrated molding process to form the cover plate body 1 with the protective bracket 2. In this embodiment, the protective bracket 2 and the cover plate body 1 are manufactured separately, and after manufacturing, the protective bracket 2 and the cover plate body 1 are welded together.

[0040] In this embodiment, in order to verify the effect of the effective area F of the exhaust structure 21 for gas flow on the protective bracket 2 and the effective area S1 of the explosion-proof valve 3 for releasing pressurized gas on the exhaust in thermal runaway, as shown in Table 1, three sets of embodiments and three sets of comparative examples are provided for verification.

[0041] Table 1

[0042]

[0043] In Example 1, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 is set to 88 mm. 2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 110 mm. 2 At this point, both conditions satisfy F > 1.2S1, and the thermal runaway safety test result is qualified. The explosion-proof valve 3 exhausts smoothly, and the exhaust effect is not affected.

[0044] In Example 2, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 is set to 88 mm. 2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 120 mm. 2 At this point, both conditions satisfy F > 1.2S1, and the thermal runaway safety test result is qualified. The explosion-proof valve 3 exhausts smoothly, and the exhaust effect is not affected.

[0045] In Example 3, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 is set to 88 mm.2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 130 mm. 2 At this point, both conditions satisfy F > 1.2S1, and the thermal runaway safety test result is qualified. The explosion-proof valve 3 exhausts smoothly, and the exhaust effect is not affected.

[0046] As can be seen from Examples 1 to 3, when the effective area F of the exhaust structure 21 for gas flow on the protective bracket 2 and the effective area S1 of the explosion-proof valve 3 for releasing pressurized gas are limited to satisfying F > 1.2S1, the effective area of ​​the exhaust structure 21 for gas flow is large enough to meet the release requirements of the explosion-proof valve 3, so that during thermal runaway, the exhaust will not be obstructed, the explosion-proof valve 3 will exhaust smoothly, and the exhaust effect will not be affected, thus passing the thermal runaway safety test.

[0047] In Comparative Example 1, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 is set to 88 mm. 2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 95 mm². 2 At this point, the two conditions do not satisfy F > 1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 does not exhaust smoothly, and the exhaust effect is weakened.

[0048] In Comparative Example 2, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 was set to 88 mm. 2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 100 mm. 2 At this point, the two conditions do not satisfy F > 1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 does not exhaust smoothly, and the exhaust effect is weakened.

[0049] In Comparative Example 3, the effective area S1 for releasing pressurized gas by the explosion-proof valve 3 was set to 88 mm. 2 The effective area F of the exhaust structure 21 on the protective bracket 2 for gas flow is set to 105 mm². 2 At this point, the two conditions do not satisfy F > 1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 does not exhaust smoothly, and the exhaust effect is weakened.

[0050] As can be seen from Comparative Examples 1 to 3, when the relationship between the effective area F of the exhaust structure 21 used for gas flow on the protective bracket 2 and the effective area S1 of the explosion-proof valve 3 for releasing pressurized gas does not satisfy F > 1.2S1, the effective area of ​​the exhaust structure 21 used for gas flow is too small and cannot meet the release requirements of the explosion-proof valve 3. As a result, during thermal runaway, the exhaust is obstructed, the explosion-proof valve 3 does not exhaust smoothly, and the exhaust effect is affected to a certain extent, thus failing the thermal runaway safety test.

[0051] Optionally, such as Figure 3 , Figure 4 As shown, the length of the protective bracket 2 along the first direction is L, and the length of the explosion-proof valve 3 along the first direction is A, and LA > 3mm. Since the protective bracket 2 is welded to the cover plate body 1, the difference between the length L of the protective bracket 2 along the first direction and the length A of the explosion-proof valve 3 along the first direction is limited to ensure that the relationship between the two satisfies LA > 3mm. This ensures that when the protective bracket 2 is welded to the cover plate body 1, there is sufficient space between it and the explosion-proof valve 3 in the first direction, avoiding the high temperature during welding from affecting the explosion-proof valve 3 and reducing the opening pressure of the explosion-proof valve 3.

[0052] Optionally, the cover plate body 1 with mounting through holes 11, and / or the width dimension of the outer shell body along the first direction is H, and HL > 3mm. By limiting the difference between the width dimension H of the cover plate body 1 and / or the outer shell body along the first direction and the length dimension L of the protective bracket 2 along the first direction, the relationship between the two is made to satisfy HL > 3mm, thereby avoiding the protective bracket 2 from being too close to the boundaries of the cover plate body 1 or the outer shell body on both sides along the first direction, which would cause interference when the cover plate body 1 and the outer shell body are assembled, and ensuring smooth assembly.

[0053] Optionally, such as Figure 3 , Figure 4 As shown, the width dimension of the protective bracket 2 along the second direction is W, and the width dimension of the explosion-proof valve 3 along the second direction is B, satisfying WB > 3mm. Since the protective bracket 2 is welded to the cover plate body 1, the difference between the width dimension W of the protective bracket 2 along the second direction and the width dimension B of the explosion-proof valve 3 along the second direction is limited to ensure that the relationship between the two satisfies WB > 3mm. This ensures that when the protective bracket 2 is welded to the cover plate body 1, there is sufficient space between it and the explosion-proof valve 3 in the second direction, avoiding the high temperature during welding from affecting the explosion-proof valve 3 and reducing the opening pressure of the explosion-proof valve 3.

[0054] In this embodiment, in order to verify the effects of assembling the cover body 1 and the outer shell body with the length L of the protective bracket 2 along the first direction, the length A of the explosion-proof valve 3 along the first direction, the width H of the cover body 1 or the outer shell body along the first direction, the width W of the protective bracket 2 along the second direction, and the width B of the explosion-proof valve 3 along the second direction, as shown in Table 2, four sets of embodiments and three sets of comparative examples are provided for verification.

[0055] Table 2

[0056]

[0057] In embodiment 4, the cover body 1 and / or the outer shell body are set to have a width dimension H of 45mm along the first direction, the protective bracket 2 is set to have a length dimension L of 36mm along the first direction, the protective bracket 2 is set to have a width dimension W of 26mm along the second direction, the explosion-proof valve 3 is set to have a length dimension A of 30mm along the first direction, and the explosion-proof valve 3 is set to have a width dimension B of 20mm along the second direction. After assembly and testing of the opening pressure of the explosion-proof valve 3, the cover body 1 and the outer shell body can be assembled smoothly, the protective bracket 2 will not interfere, and the opening pressure of the explosion-proof valve 3 will not be affected.

[0058] In embodiment 5, the cover body 1 and / or the outer shell body are set to have a width H of 45 mm in the first direction, the protective bracket 2 is set to have a length L of 37 mm in the first direction, the protective bracket 2 is set to have a width W of 27 mm in the second direction, the explosion-proof valve 3 is set to have a length A of 30 mm in the first direction, and the explosion-proof valve 3 is set to have a width B of 20 mm in the second direction. After assembly and testing of the opening pressure of the explosion-proof valve 3, the cover body 1 and the outer shell body can be assembled smoothly, the protective bracket 2 will not interfere, and the opening pressure of the explosion-proof valve 3 will not be affected.

[0059] In embodiment 6, the cover body 1 and / or the outer shell body are set to have a width H of 46 mm in the first direction, the protective bracket 2 is set to have a length L of 40 mm in the first direction, the protective bracket 2 is set to have a width W of 30 mm in the second direction, the explosion-proof valve 3 is set to have a length A of 33 mm in the first direction, and the explosion-proof valve 3 is set to have a width B of 23 mm in the second direction. After assembly and testing of the opening pressure of the explosion-proof valve 3, the cover body 1 and the outer shell body can be assembled smoothly, the protective bracket 2 will not interfere, and the opening pressure of the explosion-proof valve 3 will not be affected.

[0060] In embodiment 7, the cover body 1 and / or the outer shell body are set to have a width dimension H of 47mm along the first direction, the protective bracket 2 is set to have a length dimension L of 40mm along the first direction, the protective bracket 2 is set to have a width dimension W of 30mm along the second direction, the explosion-proof valve 3 is set to have a length dimension A of 33mm along the first direction, and the explosion-proof valve 3 is set to have a width dimension B of 23mm along the second direction. After assembly and testing of the opening pressure of the explosion-proof valve 3, the cover body 1 and the outer shell body can be assembled smoothly, the protective bracket 2 will not interfere, and the opening pressure of the explosion-proof valve 3 will not be affected.

[0061] As can be seen from Examples 4 to 7, when the difference between the length L of the protective bracket 2 along the first direction and the length A of the explosion-proof valve 3 along the first direction satisfies LA > 3mm, the difference between the width H of the cover plate body 1 or the outer shell body along the first direction and the length L of the protective bracket 2 along the first direction satisfies HL > 3mm, and the difference between the width W of the protective bracket 2 along the second direction and the width B of the explosion-proof valve 3 along the second direction satisfies WB > 3mm, the protective bracket 2 will not interfere with the assembly between the cover plate body 1 and the outer shell body, and there is a sufficient gap between the protective bracket 2 and the explosion-proof valve 3, thereby avoiding the high temperature of the protective bracket 2 during welding operations from affecting the opening pressure of the explosion-proof valve 3.

[0062] In Comparative Example 4, the width H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length L of the protective bracket 2 along the first direction is set to 44 mm, the width W of the protective bracket 2 along the second direction is set to 26 mm, the length A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width B of the explosion-proof valve 3 along the second direction is set to 20 mm. At this time, when assembling the cover body 1 and the outer shell body, the protective bracket 2 causes interference, hindering the assembly operation of the cover body 1 and the outer shell body, but the opening pressure of the explosion-proof valve 3 is not affected.

[0063] As can be seen from Comparative Example 4, since the difference between the width dimension H of the cover body 1 and / or the outer shell body along the first direction and the length dimension L of the protective bracket 2 along the first direction is 1mm, which does not meet the setting requirement of HL>3mm, the protective bracket 2 is too close to the boundaries of the cover body 1 or the outer shell body along the first direction, resulting in interference when the cover body 1 and the outer shell body are assembled.

[0064] In Comparative Example 5, the width H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length L of the protective bracket 2 along the first direction is set to 36 mm, the width W of the protective bracket 2 along the second direction is set to 26 mm, the length A of the explosion-proof valve 3 along the first direction is set to 34 mm, and the width B of the explosion-proof valve 3 along the second direction is set to 20 mm. At this time, when assembling the cover body 1 and the outer shell body, the cover body 1 and the outer shell body can be assembled smoothly, and the protective bracket 2 will not interfere. However, the opening pressure of the explosion-proof valve 3 is reduced by 0.11 MPa.

[0065] As can be seen from Comparative Example 5, since the difference between the length L of the protective bracket 2 along the first direction and the length A of the explosion-proof valve 3 along the first direction is 2mm, which does not meet the setting requirement of LA>3mm, when the protective bracket 2 is welded to the cover plate body 1, there is not enough space between it and the explosion-proof valve 3 in the first direction, resulting in high temperature during welding, which affects the explosion-proof valve 3 and reduces the opening pressure of the explosion-proof valve 3.

[0066] In Comparative Example 6, the width H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length L of the protective bracket 2 along the first direction is set to 36 mm, the width W of the protective bracket 2 along the second direction is set to 26 mm, the length A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width B of the explosion-proof valve 3 along the second direction is set to 24 mm. At this time, when assembling the cover body 1 and the outer shell body, the cover body 1 and the outer shell body can be assembled smoothly, and the protective bracket 2 will not interfere. However, the opening pressure of the explosion-proof valve 3 is reduced by 0.11 MPa.

[0067] As can be seen from Comparative Example 6, since the difference between the width dimension W of the protective bracket 2 along the second direction and the width dimension B of the explosion-proof valve 3 along the second direction is 2mm, which does not meet the setting requirement of WB>3mm, when the protective bracket 2 is welded to the cover plate body 1, there is not enough space left between it and the explosion-proof valve 3 in the second direction, resulting in high temperature during welding, which affects the explosion-proof valve 3 and reduces the opening pressure of the explosion-proof valve 3.

[0068] Optionally, such as Figure 1 , Figure 5 As shown, the exhaust structure 21 includes a first exhaust channel 211, and the protective bracket 2 includes a support plate 22 and multiple connecting seats 23. One end of the multiple connecting seats 23 is connected to the cover plate body 1 and / or the outer shell body, and the support plate 22 is connected to the other end of the multiple connecting seats 23 to form a first exhaust channel 211 between the support plate 22 and the cover plate body 1 and / or the outer shell body. By connecting the support plate 22 to the other end of the connecting seats 23, the electrode assembly is fixed by the support plate 22, and the support plate 22 is also raised, so that a first exhaust channel 211 for gas flow is formed between the support plate 22 and the cover plate body 1 and / or the outer shell body, thereby ensuring that in the event of thermal runaway, the pressurized gas can be released by opening the explosion-proof valve 3 through the first exhaust channel 211.

[0069] Furthermore, such as Figure 1 , Figure 5As shown, the exhaust structure 21 also includes a second exhaust channel 212. An exhaust hole 221 penetrating the support plate 22 is provided on the support plate 22 to form the second exhaust channel 212. By providing the exhaust hole 221 as the second exhaust channel 212 on the support plate 22, the first exhaust channel 211 and the second exhaust channel 212 cooperate with each other. In the event of thermal runaway, pressurized gas can break through the explosion-proof valve 3 from different directions, thereby achieving the discharge of pressurized gas during thermal runaway and ensuring exhaust efficiency and effect.

[0070] Optionally, such as Figure 1 , Figure 5 As shown, the protective bracket 2 also includes at least one reinforcing rib 24, which is disposed within the vent hole 221. By providing the reinforcing rib 24 within the vent hole 221, the structural strength of the protective bracket 2 at the vent hole 221 is ensured, so that it has sufficient strength to fix the electrode assembly in the event of thermal runaway.

[0071] The number of reinforcing ribs 24 can be freely set according to requirements. In this embodiment, two vertically intersecting reinforcing ribs 24 are provided in the vent 221.

[0072] Optionally, such as Figure 1 , Figure 5 As shown, the connecting seat 23 includes a connecting part 231 and a fixing part 232. The connecting part 231 is vertically connected to the support plate 22, and the fixing part 232 is connected to the other end of the connecting part 231 and is parallel to the support plate 22. By providing the fixing part 232 parallel to the support plate 22, the contact area between the connecting seat 23 and the cover plate body 1 or the outer shell body is increased. This not only provides ample welding space for welding operations of the connecting seat 23, but also ensures sufficient connection strength between the connecting seat 23 and the cover plate body 1 or the outer shell body after connection.

[0073] Optionally, such as Figure 1 As shown, multiple connecting seats 23 are symmetrically distributed on both sides of the support plate 22 along the second direction. Since the width of the cover plate body 1 or the outer shell body along the first direction is relatively narrow, by symmetrically distributing multiple connecting seats 23 on both sides of the support plate 22 along the second direction, on the one hand, sufficient space is provided for the connection of the connecting seats 23, and on the other hand, interference is avoided when the connecting seats 23 are assembled with the outer shell body and the cover plate body 1.

[0074] In this embodiment, a battery is also provided, comprising an electrode assembly and the aforementioned battery casing, with the electrode assembly disposed within the battery casing. By utilizing the aforementioned battery casing, this battery ensures a relatively high venting efficiency in the event of thermal runaway, allowing the pressurized gas to be released rapidly during thermal runaway, reducing the risk factor during thermal runaway, and improving the safety performance of the product.

[0075] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery casing, characterized in that, The battery casing includes: A housing assembly, comprising an outer shell body and a cover plate body, the outer shell body having at least one opening, the cover plate body corresponding one-to-one with the opening of the outer shell body and closing the opening of the outer shell body to form a receiving cavity for accommodating an electrode assembly, the outer shell body and / or the cover plate body having a mounting through hole communicating with the receiving cavity; A protective bracket is disposed within the receiving cavity and mounted on the outer shell body, and / or the cover plate body has the mounting through hole, and the protective bracket has an exhaust structure for connecting the mounting through hole and the receiving cavity, the effective area of ​​the exhaust structure for gas flow being F; An explosion-proof valve is disposed in the mounting through hole and is used to release the pressurized gas inside the receiving cavity. The effective area of ​​the explosion-proof valve for releasing the pressurized gas is S1, and satisfies that F > 1.2S1. The length of the protective bracket along the first direction is L, and the length of the explosion-proof valve along the first direction is A, and LA > 3mm. The cover plate body having the mounting through hole, and / or the width dimension of the outer shell body along the first direction is H, and satisfies HL>3mm; The width dimension of the protective bracket along the second direction is W, and the width dimension of the explosion-proof valve along the second direction is B, and WB > 3mm; The exhaust structure includes a first exhaust channel, and the protective bracket includes a support plate and a plurality of connecting seats. One end of the plurality of connecting seats is connected to the cover plate body and / or the outer shell body, and the support plate is connected to the other end of the plurality of connecting seats to form the first exhaust channel between the support plate and the cover plate body and / or the outer shell body.

2. The battery casing according to claim 1, characterized in that, The exhaust structure also includes a second exhaust channel, and an exhaust hole penetrating the support plate is provided on the support plate to form the second exhaust channel.

3. The battery casing according to claim 2, characterized in that, The protective bracket also includes at least one reinforcing rib, and at least one of the reinforcing ribs is disposed inside the vent hole.

4. The battery casing according to claim 1, characterized in that, The connecting seat includes a connecting part and a fixing part. The connecting part is vertically connected to the support plate, and the fixing part is connected to the other end of the connecting part and is parallel to the support plate.

5. The battery casing according to claim 1, characterized in that, Multiple connecting seats are symmetrically distributed on both sides of the support plate along the second direction.

6. A battery, characterized in that, The battery includes an electrode assembly and a battery casing as described in any one of claims 1-5, wherein the electrode assembly is disposed within the battery casing.

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