Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell assembly, a protective support and an explosion-proof valve, the shell assembly comprises a shell body and a cover plate body, the shell body and / or the cover plate body are / is provided with mounting through holes, the protective support is arranged at the mounting through hole of the shell body or the cover plate body, and the explosion-proof valve is arranged on the protective support. The protection support is provided with an exhaust structure communicated with the installation through hole, the effective area, used for gas circulation, of the exhaust structure is F, the anti-explosion valve is arranged in the installation through hole, the effective area, used for releasing pressure gas, of the anti-explosion valve is S1, and the requirement that F is larger than 1.2 S1 is met. When thermal runaway occurs and an insulation part is heated and melted, the protection support can play a role in supporting and fixing the pole group, the effective area F of the exhaust structure on the protection support is limited, it is guaranteed that the exhaust structure meets the exhaust requirement of the anti-explosion valve, and high safety performance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery casing and a battery. Background Art

[0002] Traditional blade batteries are usually designed with tabs on both sides, and their structure includes: cover plate (with integrated pole column, explosion-proof valve, injection hole, etc.), shell, pole group, electrolyte, etc. After the cover plate and shell are welded, a closed space with certain mechanical strength is formed to protect the pole group; the pole group is fixed to the pole column base of the cover plate on both sides through laser welding through the tabs on both sides to achieve electrical connection, and the length direction of the battery cell is mainly fixed by the insulating material under the cover plate pressing on the pole group; the cover plate is integrated with an explosion-proof valve structure, which is mainly used for the directional discharge of internal high-temperature and high-pressure gas when the battery has thermal runaway due to internal short circuit, thereby improving the safety performance of the battery.

[0003] The insulating components used for insulation and fixing the electrode group are generally made of PP material, and their strength and high temperature resistance are very limited. When the temperature reaches about 150 degrees, the insulating components fixing the electrode group will melt due to the high temperature, and the temperature at which the battery cell undergoes thermal runaway is usually much higher than the melting point of these insulating materials. Therefore, once thermal runaway occurs, the electrode group cannot be effectively fixed due to the melting of the insulating components, causing the electrode group to move inside the shell, resulting in the electrode group blocking the exhaust channel of the explosion-proof valve, thereby greatly reducing the exhaust effect of the explosion-proof valve when thermal runaway occurs, thereby causing explosions and other adverse problems, and its safety of use is poor. Summary of the invention

[0004] The object of the present invention is to provide a battery casing and a battery, which improve the situation that the pole group blocks the explosion-proof valve and have higher safety in use.

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

[0006] In one aspect, a battery housing is provided, the battery housing comprising:

[0007] A shell assembly, the shell assembly comprising a shell body and a cover body, the shell body being provided with at least one opening, the cover body corresponding to the opening of the shell body one by one and closing the opening of the shell body to form an accommodating cavity for accommodating the pole group, the shell body and / or the cover body being provided with a mounting through hole communicating with the accommodating cavity;

[0008] A protective bracket, the protective bracket is arranged in the accommodating cavity and is mounted at the place where the housing body or the cover body is provided with the mounting through hole, the protective bracket is provided with an exhaust structure for connecting the mounting through hole and the accommodating cavity, and the effective area of ​​the exhaust structure for gas circulation is F;

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

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

[0011] Optionally, the cover body or the shell body provided with the mounting through hole has a width dimension H along the first direction, and satisfies HL>3mm.

[0012] Optionally, a width dimension of the protective bracket along the second direction is W, a 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, 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 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 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 opened 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 exhaust hole.

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

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

[0018] On the other hand, a battery is provided, comprising a pole group and a battery casing as described in any one of the above items, wherein the pole group is arranged in the battery casing.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a battery casing, which is provided with a protective bracket located in a housing cavity and / or a cover plate body at a mounting through hole, so that an explosion-proof valve is protected by the protective bracket. When thermal runaway occurs, even if the insulating component is melted by heat, the protective bracket can still support and fix the electrode group, thereby avoiding the problem of the electrode group blocking the exhaust channel of the explosion-proof valve due to free movement. In addition, the relationship between the effective area F of the exhaust structure on the protective bracket for gas circulation and the effective area S1 of the explosion-proof valve for releasing pressure gas is defined, so that the two satisfy F>1.2S1, thereby ensuring that the exhaust structure on the protective bracket meets the exhaust requirements of the explosion-proof valve and the exhaust effect of the explosion-proof valve, thereby having higher safety performance.

[0021] The present invention also provides a battery, which, by applying the above-mentioned battery casing, ensures a relatively efficient exhaust efficiency when thermal runaway occurs, so that the pressurized gas during thermal runaway can be released quickly, reducing the risk factor during thermal runaway and improving the safety performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 It is a structural exploded view of the protective bracket, explosion-proof valve and cover body in the battery housing provided by the present invention;

[0024] Figure 3 It is a planar structural diagram of the protective bracket and the cover plate body in the battery housing provided by the present invention after being assembled;

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

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

[0027] In the figure:

[0028] 1. Cover plate body; 11. Installation 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. Reinforcement rib;

[0030] 3. Explosion-proof valve. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] When thermal runaway occurs, the insulating components used to fix the pole group will melt due to the high temperature, making it impossible to effectively fix the pole group. As a result, the pole group will move inside the shell during thermal runaway, thereby blocking the exhaust channel of the explosion-proof valve, greatly reducing the exhaust effect, making it impossible to achieve rapid pressure reduction, and reducing safety of use.

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

[0037] like Figures 1 to 5As shown, the battery shell includes a shell assembly, a protective bracket 2 and an explosion-proof valve 3. The shell assembly includes a shell body and a cover body 1. The shell body is provided with at least one opening. The cover body 1 corresponds to the opening of the shell body one by one and closes the opening of the shell body to form a receiving cavity for receiving the pole group. The shell body and / or the cover body 1 are provided with a mounting through hole 11 connected to the receiving cavity. The protective bracket 2 is arranged in the receiving cavity and is mounted on the shell body and / or the cover body 1 is provided with a mounting through hole 11. The protective bracket 2 is provided with an exhaust structure 21 for connecting the mounting through hole 11 and the receiving cavity. The effective area of ​​the exhaust structure 21 for gas circulation is F. The explosion-proof valve 3 is arranged in the mounting through hole 11 and is used to release the pressure gas inside the receiving cavity. The effective area of ​​the explosion-proof valve 3 for releasing the pressure gas is S1, and satisfies F>1.2S1.

[0038] The battery casing is provided with a protective bracket 2 in the accommodating cavity, which is located at the casing body and / or the cover plate body 1 where the mounting through hole 11 is opened, so that the explosion-proof valve 3 is protected by the protective bracket 2. When thermal runaway occurs, even if the insulating component is melted by heat, the protective bracket 2 can still support and fix the electrode group, thereby avoiding the problem of the electrode group blocking the exhaust channel of the explosion-proof valve 3 due to free movement. In addition, the relationship between the effective area F of the exhaust structure 21 for gas circulation on the protective bracket 2 and the effective area S1 of the explosion-proof valve 3 for releasing the pressure gas is limited, so that the two satisfy F>1.2S1, thereby ensuring 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, thereby having higher safety performance.

[0039] Among them, the battery shell can be adapted to different types of batteries, such as blade batteries or square shell batteries. In addition, the battery shell can be formed into blade batteries or square shell batteries of various structures by the number of openings of the shell body and the number of cover bodies 1, for example: a blade battery with a shell body with openings on both sides and a double cover body 1, or a blade battery with a shell body with openings on one side and a single cover body 1, or a square shell battery with a shell body with openings on one side and a single cover body 1, etc., and the mounting through hole 11 can be set separately on the shell body, or can be set separately on the cover body 1, and the mounting through hole 11 can also be set on both the cover body 1 and the shell body. In this embodiment, the specific structure of the battery shell is a blade battery shell composed of a shell body with double-sided openings and a double cover body 1, wherein the mounting through hole 11 is provided on the cover body 1, and the shell body is not provided with the mounting through hole 11, so the protective bracket 2 is provided on the cover body 1, wherein the protective bracket 2 and the cover body 1 can be separately molded and manufactured and then connected, or the cover body 1 with the protective bracket 2 can be manufactured by an integrated molding process. In this embodiment, the protective bracket 2 and the cover body 1 are separately molded and manufactured, and after the manufacturing is completed, the protective bracket 2 and the cover body 1 are welded.

[0040] In this embodiment, in order to verify the effects of the effective area F of the exhaust structure 21 for gas circulation 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 groups of embodiments and three groups of comparative examples are provided for verification.

[0041] Table 1

[0042]

[0043] In Example 1, the effective area S1 of the explosion-proof valve 3 for releasing the pressure gas is set to 88 mm 2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 110mm 2 At this time, both 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 of the explosion-proof valve 3 for releasing the pressurized gas is set to 88 mm. 2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 120mm 2 At this time, both 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 of the explosion-proof valve 3 for releasing the pressure gas is set to 88 mm.2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 130mm 2 At this time, both 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] It can be seen from Examples 1 to 3 that when the relationship between the effective area F of the exhaust structure 21 for gas circulation on the protective bracket 2 and the effective area S1 for releasing the pressure gas of the explosion-proof valve 3 satisfies F>1.2S1, at this time, the effective area of ​​the exhaust structure 21 for gas circulation is large enough to meet the release requirement of the explosion-proof valve 3, so that in the event of thermal runaway, the exhaust will not be hindered, the explosion-proof valve 3 will exhaust smoothly, and the exhaust effect will not be affected, thereby passing the thermal runaway safety test.

[0047] In comparative example 1, the effective area S1 of the explosion-proof valve 3 for releasing the pressurized gas is set to 88 mm 2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 95mm 2 At this time, the two do not meet F>1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 is not exhausting smoothly, and the exhaust effect is weakened.

[0048] In comparative example 2, the effective area S1 of the explosion-proof valve 3 for releasing the pressurized gas is set to 88 mm 2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 100mm 2 At this time, the two do not meet F>1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 is not exhausting smoothly, and the exhaust effect is weakened.

[0049] In comparative example 3, the effective area S1 of the explosion-proof valve 3 for releasing the pressurized gas is set to 88 mm 2 , the effective area F of the exhaust structure 21 for gas circulation on the protective support 2 is set to 105mm 2 At this time, the two do not meet F>1.2S1, and the thermal runaway safety test result is unqualified. The explosion-proof valve 3 is not exhausting smoothly, and the exhaust effect is weakened.

[0050] It can be seen from Comparative Examples 1 to 3 that when the relationship between the effective area F of the exhaust structure 21 for gas circulation on the protective bracket 2 and the effective area S1 for releasing the pressure gas of the explosion-proof valve 3 does not satisfy F>1.2S1, the effective area of ​​the exhaust structure 21 for gas circulation is too small to meet the release requirement of the explosion-proof valve 3, so that when thermal runaway occurs, the exhaust is blocked, the explosion-proof valve 3 does not exhaust smoothly, and the exhaust effect is affected to a certain extent, thereby failing the thermal runaway safety test.

[0051] Alternatively, if Figure 3 , Figure 4 As shown, the length dimension of the protection bracket 2 along the first direction is L, and the length dimension of the explosion-proof valve 3 along the first direction is A, and LA>3mm is satisfied. Since the protection bracket 2 is welded on the cover body 1, the difference between the length dimension L of the protection bracket 2 along the first direction and the length dimension A of the explosion-proof valve 3 along the first direction is limited so that the relationship between the two satisfies LA>3mm, thereby ensuring that when the protection bracket 2 is welded to the cover body 1, there is enough space between the explosion-proof valve 3 in the first direction, avoiding the high temperature during welding, which affects the explosion-proof valve 3, and reducing the valve opening pressure of the explosion-proof valve 3.

[0052] Optionally, the width dimension of the cover body 1 and / or the shell body along the first direction with the mounting through hole 11 is H, and satisfies HL>3mm. By limiting the difference between the width dimension H of the cover body 1 and / or the 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 satisfies HL>3mm, thereby preventing the protective bracket 2 from being too close to the boundaries of the cover body 1 or the shell body on both sides along the first direction, causing interference when the cover body 1 and the shell body are assembled, thereby ensuring smooth assembly.

[0053] Alternatively, if Figure 3 , Figure 4 As shown, the width dimension of the protection bracket 2 along the second direction is W, and the width dimension of the explosion-proof valve 3 along the second direction is B, and they satisfy WB>3mm. Since the protection bracket 2 is welded on the cover body 1, the difference between the width dimension W of the protection bracket 2 along the second direction and the width dimension B of the explosion-proof valve 3 along the second direction is limited so that the relationship between the two satisfies WB>3mm, thereby ensuring that when the protection bracket 2 is welded to the cover body 1, there is enough space between the explosion-proof valve 3 in the second direction, avoiding the high temperature during welding, which affects the explosion-proof valve 3, and reducing the valve opening pressure of the explosion-proof valve 3.

[0054] In this embodiment, in order to verify the influence of the length dimension L of the protective bracket 2 along the first direction, the length dimension A of the explosion-proof valve 3 along the first direction, the width dimension H of the cover body 1 or the outer shell body along the first direction, 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 on the assembly of the cover body 1 and the outer shell body, as well as the explosion-proof valve 3, as shown in Table 2, four groups of embodiments and three groups of comparative examples are provided for verification.

[0055] Table 2

[0056]

[0057] In Example 4, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length dimension L of the protective bracket 2 along the first direction is set to 36 mm, the width dimension W of the protective bracket 2 along the second direction is set to 26 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width dimension B of the explosion-proof valve 3 along the second direction is set to 20 mm. At this time, 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 Example 5, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length dimension L of the protective bracket 2 along the first direction is set to 37 mm, the width dimension W of the protective bracket 2 along the second direction is set to 27 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width dimension B of the explosion-proof valve 3 along the second direction is set to 20 mm. At this time, 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 Example 6, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 46 mm, the length dimension L of the protective bracket 2 along the first direction is set to 40 mm, the width dimension W of the protective bracket 2 along the second direction is set to 30 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 33 mm, and the width dimension B of the explosion-proof valve 3 along the second direction is set to 23 mm. At this time, 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 Example 7, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 47 mm, the length dimension L of the protective bracket 2 along the first direction is set to 40 mm, the width dimension W of the protective bracket 2 along the second direction is set to 30 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 33 mm, and the width dimension B of the explosion-proof valve 3 along the second direction is set to 23 mm. At this time, 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] It can be seen from Examples 4 to 7 that when the difference between the length dimension L of the protective bracket 2 along the first direction and the length dimension A of the explosion-proof valve 3 along the first direction satisfies LA>3mm, the difference between the width dimension H of the cover body 1 or the outer shell body along the first direction and the length dimension L of the protective bracket 2 along the first direction satisfies HL>3mm, and 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 satisfies WB>3mm, the protective bracket 2 will not interfere with the assembly between the cover body 1 and the outer shell body, and a sufficient gap is reserved between the protective bracket 2 and the explosion-proof valve 3, thereby avoiding the high temperature of the protective bracket 2 during welding operation affecting the opening pressure of the explosion-proof valve 3.

[0062] In comparative example 4, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length dimension L of the protective bracket 2 along the first direction is set to 44 mm, the width dimension W of the protective bracket 2 along the second direction is set to 26 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width dimension 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] It can be seen from Comparative Example 4 that 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 1 mm, the setting requirement of HL>3 mm is not met. At this time, the protective bracket 2 is too close to the boundaries of the cover body 1 or the outer shell body on both sides 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 dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length dimension L of the protective bracket 2 along the first direction is set to 36 mm, the width dimension W of the protective bracket 2 along the second direction is set to 26 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 34 mm, and the width dimension 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, the protective bracket 2 will not interfere, but the opening pressure of the explosion-proof valve 3 is reduced by 0.11 MP.

[0065] It can be seen from Comparative Example 5 that since the difference between the length dimension L of the protective bracket 2 along the first direction and the length dimension A of the explosion-proof valve 3 along the first direction is 2 mm, the setting requirement of LA>3 mm is not met. At this time, when the protective bracket 2 is welded to the cover body 1, there is not enough space left between the protective bracket 2 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 valve opening pressure of the explosion-proof valve 3.

[0066] In comparative example 6, the width dimension H of the cover body 1 and / or the outer shell body along the first direction is set to 45 mm, the length dimension L of the protective bracket 2 along the first direction is set to 36 mm, the width dimension W of the protective bracket 2 along the second direction is set to 26 mm, the length dimension A of the explosion-proof valve 3 along the first direction is set to 30 mm, and the width dimension 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, the protective bracket 2 will not interfere, but the opening pressure of the explosion-proof valve 3 is reduced by 0.11 MP.

[0067] It can be seen from Comparative Example 6 that 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 2 mm, the setting requirement of WB>3 mm is not met. At this time, when the protective bracket 2 is welded to the cover body 1, there is not enough space left between the protective bracket 2 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 valve opening pressure of the explosion-proof valve 3.

[0068] Alternatively, if 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 a plurality of connection seats 23, one end of the plurality of connection seats 23 is connected to the cover body 1, and / or the shell body, and the support plate 22 is connected to the other end of the plurality of connection seats 23, so as to form a first exhaust channel 211 between the support plate 22 and the cover body 1, and / or the shell body. By connecting the support plate 22 to the other end of the connection seat 23, the pole group is fixed by the support plate 22, and the support plate 22 is elevated, so that the first exhaust channel 211 for gas flow is formed between the support plate 22 and the cover body 1, and / or the shell body, so as to ensure that in the event of thermal runaway, the pressurized gas can be flushed through the first exhaust channel 211 to open the explosion-proof valve 3 to achieve pressure relief.

[0069] Furthermore, if Figure 1 , Figure 5As shown, the exhaust structure 21 also includes a second exhaust channel 212, and 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, and when thermal runaway occurs, the pressurized gas can break through the explosion-proof valve 3 from different directions, thereby achieving the discharge of the pressurized gas during thermal runaway and ensuring the efficiency and effect of the exhaust.

[0070] Alternatively, if Figure 1 , Figure 5 As shown, the protection bracket 2 further includes at least one reinforcing rib 24, and at least one reinforcing rib 24 is disposed in the exhaust hole 221. By disposing the reinforcing rib 24 in the exhaust hole 221, the structural strength of the protection bracket 2 where the exhaust hole 221 is opened is ensured, so that when thermal runaway occurs, there is sufficient strength to fix the pole group.

[0071] The number of the reinforcing ribs 24 can be freely set according to the requirements. In the present embodiment, two vertically crossed reinforcing ribs 24 are provided in the exhaust hole 221 .

[0072] Alternatively, if Figure 1 , Figure 5 As shown, the connection seat 23 includes a connection portion 231 and a fixing portion 232, wherein the connection portion 231 is vertically connected to the support plate 22, and the fixing portion 232 is connected to the other end of the connection portion 231 and is parallel to the support plate 22. By providing the fixing portion 232 parallel to the support plate 22, the contact area between the connection seat 23 and the cover plate body 1 or the shell body is increased, which not only provides sufficient welding space for the connection seat 23 during welding, but also ensures that the connection seat 23 and the cover plate body 1 or the shell body have sufficient connection strength after connection.

[0073] Alternatively, if Figure 1 As shown, a plurality of connection 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 shell body along the first direction is relatively narrow, by symmetrically distributing a plurality of connection 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 connection seats 23, and on the other hand, interference caused by the connection seats 23 when the shell body and the cover plate body 1 are assembled is avoided.

[0074] In this embodiment, a battery is also provided, the battery comprising an electrode group and the above-mentioned battery casing, wherein the electrode group is arranged in the battery casing. By using the above-mentioned battery casing, the battery ensures a relatively high exhaust efficiency when thermal runaway occurs, so that the pressurized gas during thermal runaway can be quickly released, thereby 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 embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery housing, characterized in that: The battery housing comprises: A shell assembly, the shell assembly comprising a shell body and a cover body, the shell body being provided with at least one opening, the cover body corresponding to the opening of the shell body one by one and closing the opening of the shell body to form an accommodating cavity for accommodating the pole group, the shell body and / or the cover body being provided with a mounting through hole communicating with the accommodating cavity; A protective bracket, the protective bracket is arranged in the accommodating cavity and mounted on the shell body, and / or the cover body is provided with the mounting through hole, the protective bracket is provided with an exhaust structure for connecting the mounting through hole and the accommodating cavity, and the effective area of ​​the exhaust structure for gas circulation is F; An explosion-proof valve is arranged in the installation through hole and is used to release the pressurized gas inside the accommodating cavity. The effective area of ​​the explosion-proof valve for releasing the pressurized gas is S1, and it satisfies that F>1.2S1.

2. The battery housing according to claim 1, characterized in that: The length dimension of the protective bracket along the first direction is L, the length dimension of the explosion-proof valve along the first direction is A, and LA>3mm is satisfied.

3. The battery housing according to claim 2, characterized in that: The cover body having the mounting through hole and / or the shell body has a width dimension H along the first direction and satisfies HL>3mm.

4. The battery housing according to claim 1, characterized in that: The width dimension of the protective bracket along the second direction is W, the width dimension of the explosion-proof valve along the second direction is B, and WB>3mm is satisfied.

5. The battery housing according to claim 1, characterized in that: 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.

6. The battery housing according to claim 5, characterized in that: The exhaust structure further includes a second exhaust channel. The support plate is provided with an exhaust hole penetrating the support plate to form the second exhaust channel.

7. The battery housing according to claim 6, characterized in that: The protective bracket also includes at least one reinforcing rib, and at least one of the reinforcing ribs is arranged in the exhaust hole.

8. The battery casing according to claim 5, characterized in that: The connecting seat comprises a connecting portion and a fixing portion, wherein the connecting portion is vertically connected to the supporting plate, and the fixing portion is connected to the other end of the connecting portion and is parallel to the supporting plate.

9. The battery housing according to claim 5, characterized in that: The plurality of connection seats are symmetrically distributed on both sides of the support plate along the second direction.

10. A battery, characterized in that The battery comprises a pole group and a battery casing as claimed in any one of claims 1 to 9, wherein the pole group is arranged in the battery casing.

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