Battery shell and battery

Abstract

The invention provides a battery shell and a battery, the battery shell comprises a shell and an explosion-proof valve, and the shell is configured to cover at least part of a battery cell; the shell comprises a mounting part, and the anti-explosion valve is arranged on the mounting part; the reinforcing part is arranged at the position, different from the anti-explosion valve, of the mounting part; wherein the reinforcing part and the anti-explosion valve are arranged in a spaced mode in the first direction, and the reinforcing part protrudes in the second direction relative to the mounting part; the second direction intersects the first direction. The reinforcing part is arranged at the position, different from the anti-explosion valve, of the mounting part and protrudes in the second direction relative to the mounting part, so that the sectional inertia moment of the whole shell is enhanced, the deformation resistance of the shell is improved, the possibility of deformation of the anti-explosion valve caused by deformation of the shell is reduced, the stability of the anti-explosion valve is improved, and the service life of the anti-explosion valve is prolonged. Therefore, the explosion-proof valve can control the explosion pressure and the explosion triggering time more accurately, and the overall safety performance of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery shell and a battery. BACKGROUND

[0002] The battery shell is an important component of the battery. In the related art, the battery shell usually includes a shell and a structure such as an explosion-proof valve arranged on the shell. The explosion-proof valve can release internal gas and substances when the temperature and pressure are too high, so as to avoid the shell from exploding.

[0003] However, the current shell has insufficient deformation resistance, which reduces the stability of the explosion-proof valve and the overall safety performance of the battery. SUMMARY

[0004] Embodiments of the present application provide a battery shell and a battery to at least partially solve the above technical problems.

[0005] In a first aspect, embodiments of the present application provide a battery shell, which includes a shell and an explosion-proof valve, the shell is configured to cover at least part of a battery cell.

[0006] The shell includes:

[0007] The mounting portion is provided with the explosion-proof valve.

[0008] The reinforcing portion is arranged on the mounting portion at a position different from the explosion-proof valve.

[0009] The reinforcing portion is arranged at a position different from the explosion-proof valve on the mounting portion, and the reinforcing portion protrudes along a second direction relative to the mounting portion.

[0010] The second direction intersects the first direction.

[0011] With the above scheme, the reinforcing portion is arranged on the mounting portion at a position different from the explosion-proof valve, and the reinforcing portion protrudes along a second direction relative to the mounting portion. The cross-sectional moment of inertia of the shell as a whole is increased, the deformation resistance of the shell is improved, the possibility of deformation of the explosion-proof valve due to deformation of the shell is reduced, the stability of the explosion-proof valve is improved, the explosion-proof valve can more accurately control the burst pressure and the burst trigger time, and the overall safety performance of the battery is improved.

[0012] Optionally, in some embodiments of the present application, the shell includes at least two reinforcing portions, and the explosion-proof valve is located between the at least two reinforcing portions in the first direction.

[0013] With the above scheme, the explosion-proof valve is arranged between the at least two reinforcing portions, the structural strength of the mounting portions on both sides of the explosion-proof valve can be simultaneously enhanced, stress can be uniformly dispersed, stress concentration of the mounting portions can be avoided, and the reliability of the mounting portions can be improved.

[0014] Optionally, in some embodiments of the present application, in the second direction, the ratio of the size H of the reinforcing portion to the thickness T of the mounting portion is 1.1 to 4.

[0015] With the above scheme, by limiting the ratio of the size H of the reinforcing portion to the thickness T of the mounting portion, the bending resistance of the mounting portion can be effectively improved, stress concentration can be avoided, the processing difficulty of the reinforcing portion can be reduced, the overall processing quality of the mounting portion and the reinforcing portion can be ensured, and the excessive occupation of the mounting space or the external space of the battery cell by the reinforcing portion can be reduced.

[0016] Optionally, in some embodiments of the present application, in the third direction, the ratio of the size W2 of the reinforcing portion to the size W1 of the mounting portion is 0.1 to 0.8.

[0017] The third direction intersects with the first direction and the second direction, respectively.

[0018] With the above scheme, by limiting the ratio of the size W2 of the reinforcing portion to the size W1 of the mounting portion, the reinforcing portion can be kept at a suitable size, the overall rigidity of the mounting portion and the reinforcing portion can be improved, the possibility of deformation of the explosion-proof valve caused by deformation of the mounting portion can be reduced, the instability of the burst pressure and the burst trigger time can be improved, and the manufacturability of the shell can be ensured.

[0019] Optionally, in some embodiments of the present application, in the first direction, the size of the mounting portion is L1, the size of the explosion-proof valve is L2, and the sum of the sizes of the reinforcing portions is La.

[0020] wherein,

[0021] With the above scheme, by limiting the ratio of La to L1-L2, the reinforcing portion can be kept at a suitable size, the overall rigidity of the mounting portion and the reinforcing portion can be improved, the possibility of deformation of the explosion-proof valve caused by deformation of the mounting portion can be reduced, the instability of the burst pressure and the burst trigger time can be improved, and the manufacturability of the shell can be ensured.

[0022] Optionally, in some embodiments of the present application, in the third direction, the size of the explosion-proof valve is D, and the size of the mounting portion is W1; the third direction intersects with the first direction and the second direction, respectively.

[0023] In the first direction, the distance S between the reinforcing portion and the explosion-proof valve is greater than or equal to 0.4D; and / or,

[0024] In the first direction, the distance S between the reinforcing portion and the explosion-proof valve is less than or equal to 3D; and / or, in the first direction, the distance S between the reinforcing portion and the explosion-proof valve is less than or equal to W1.

[0025] With the above scheme, by limiting the value range of the distance S between the reinforcing portion and the explosion-proof valve, the distance S is adapted to the size D of the explosion-proof valve in the third direction, or the distance S is adapted to the size D of the explosion-proof valve in the third direction and the size W1 of the mounting portion in the third direction, which can effectively reduce the stress concentration in the area near the explosion-proof valve, allow the explosion-proof valve to fully open without obstruction, at the same time, can strengthen the structural strength of the mounting portion near the explosion-proof valve, improve the stability of the explosion-proof valve, so as to realize the balance between the structural strength and the performance of the explosion-proof valve.

[0026] Optionally, in some embodiments of the present application, the connection between the reinforcing portion and the mounting portion is smoothly arranged.

[0027] With the above scheme, by smoothly arranging the connection between the reinforcing portion and the mounting portion, the stress concentration at the connection between the reinforcing portion and the mounting portion can be reduced.

[0028] Optionally, in some embodiments of the present application, the reinforcing portion and the mounting portion are integrally formed.

[0029] With the above scheme, the processing technology of the reinforcing portion can be simplified, the thickness of the mounting portion can be reduced, the material cost can be reduced, and the mechanical performance of the mounting portion can be ensured.

[0030] Optionally, in some embodiments of the present application, the mounting portion has:

[0031] a first surface configured to be arranged away from the battery cell;

[0032] a second surface configured to be arranged toward the battery cell;

[0033] wherein the first surface and the second surface are oppositely arranged in the second direction;

[0034] The reinforcing portion is recessed relative to the first surface, and the reinforcing portion forms a protrusion relative to the second surface.

[0035] With the above scheme, the reinforcing portion is recessed relative to the first surface and protrudes relative to the second surface, so that after the shell is assembled with the battery cell, the reinforcing portion can support the battery cell, the battery cell and the mounting portion maintain a proper distance, the battery cell does not directly contact the second surface, and a pressure relief channel is formed between the mounting portion and the battery cell; the electrolyte and the gas can act on the explosion-proof valve through the pressure relief channel, the burst pressure can be more accurately controlled, and the safety is improved; and after the explosion-proof valve bursts, the electrolyte and the gas can flow to the explosion-proof valve through the pressure relief channel and be discharged through the explosion-proof valve, reducing the risk of battery explosion.

[0036] Optionally, in some embodiments of the present application, the battery shell further comprises:

[0037] a weakening structure connected between the explosion-proof valve and the mounting portion;

[0038] wherein, in the second direction, the thickness of at least part of the weakening structure is less than the thickness of the mounting portion.

[0039] With the above scheme, by providing the weakening structure and the thickness of at least part of the weakening structure being less than the thickness of the mounting portion, the pressure that the weakening structure can withstand is less than the mounting portion, which is conducive to the explosion of the explosion-proof valve; when the internal temperature and pressure of the battery reach a set value, the explosion-proof valve can be blown open, so that the gas and substances in the battery can be discharged to the outside of the battery through the explosion-proof valve, preventing the battery from exploding.

[0040] Optionally, in some embodiments of the present application, the weakening structure comprises:

[0041] a groove formed between the explosion-proof valve and the mounting portion;

[0042] wherein, the groove is arranged around the explosion-proof valve.

[0043] With the above scheme, by providing the groove between the explosion-proof valve and the mounting portion, and arranging the groove around the explosion-proof valve, the explosion-proof valve and the mounting portion are separated, and the processing difficulty can be reduced.

[0044] Optionally, in some embodiments of the present application, the explosion-proof valve and the mounting portion are integrally formed.

[0045] With the above scheme, the processing technology of the explosion-proof valve can be simplified, the thickness of the mounting portion can be reduced, the material cost can be reduced, and the influence of the integrally formed processing method on the mechanical properties of the mounting portion is small.

[0046] Optionally, in some embodiments of the present application, the shell further comprises:

[0047] a side frame portion connected to the edge of the reinforcing portion;

[0048] The side frame and the mounting portion together form a receiving space for accommodating the battery cell.

[0049] By adopting the above solution, the side frame and the mounting part cooperate to form a receiving space, which is conducive to the assembly of the shell and the battery cell and simplifies the shell processing technology.

[0050] Secondly, embodiments of this application provide a battery, including a battery cell and a battery casing as described above.

[0051] Optionally, in some embodiments of this application, the reinforcing portion abuts against the battery cell to form a pressure relief channel between the battery cell and the mounting portion;

[0052] The pressure relief channel is connected to the explosion-proof valve.

[0053] By adopting the above solution, the reinforcing part is brought into contact with the battery cell to form a pressure relief channel between the battery cell and the mounting part. The electrolyte and gas can act on the explosion-proof valve through the pressure relief channel, which can more accurately control the burst pressure and improve safety. Furthermore, when the explosion-proof valve bursts, the electrolyte and gas can flow quickly to the explosion-proof valve through the pressure relief channel and be discharged through the explosion-proof valve, reducing the risk of battery explosion. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a perspective view of the battery casing provided in an embodiment of this application;

[0056] Figure 2 This is a top view of the battery casing provided in an embodiment of this application;

[0057] Figure 3 This is a cross-sectional view of the battery casing provided in an embodiment of this application;

[0058] Figure 4 yes Figure 3 A magnified view of a portion shown;

[0059] Figure 5 This is another cross-sectional view of the battery casing provided in an embodiment of this application;

[0060] Figure 6 yes Figure 5 A magnified view of a portion shown;

[0061] Figure 7 is a sectional view of a part of a battery provided by an embodiment of the present application;

[0062] Figure 8 is an enlarged view of a part shown in Figure 7

[0063] Figure 9 is a perspective view of another battery case provided by an embodiment of the present application;

[0064] Figure 10 is a top view of the battery case shown in Figure 9

[0065] Figure 11 is a sectional view of a part of the battery case shown in Figure 9

[0066] Figure 12 is a perspective view of still another battery case provided by an embodiment of the present application.

[0067] BRIEF DESCRIPTION OF DRAWINGS

[0068] 10, battery;

[0069] 100, battery case;

[0070] 110, housing; 111, mounting portion; 111a, first surface; 111b, second surface; 112, reinforcing portion; 113, side frame portion; 110a, accommodation space;

[0071] 120, explosion-proof valve;

[0072] 130, weakening structure; 131, groove;

[0073] Z, specified axis; P, microelement;

[0074] 210, battery cell; 10a, pressure relief passage. DETAILED DESCRIPTION

[0075] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0076] ​​​In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower of the device in the actual use or working state, and specifically refer to the direction of the drawing surface in the drawings, unless otherwise stated. In addition, in the description of the present application, the term "comprising" means "including but not limited to". The terms first, second, third, etc. are only used as labels and do not impose numerical requirements or establish an order.

[0077] In the present application, the association relationship between the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B can represent the following cases: A exists alone, A and B exist together, and B exists alone. Wherein A and B can be singular or plural.

[0078] When the internal pressure of the battery rises, the shell is subjected to the pressure generated by the internal gas or thermal expansion, causing the shell to deform. This deformation is transmitted to the explosion-proof valve through internal stress, causing the explosion-proof valve to deform or rupture, reducing the stability of the explosion-proof valve, causing the explosion-proof valve to fail to deform normally when needed, resulting in unstable explosion-proof valve opening pressure, inaccurate explosion trigger time, and other phenomena, reducing the overall safety performance of the battery.

[0079] To solve the above technical problems, in a first aspect, referring to Figures 1 to 3 The present application provides a battery shell 100, comprising: a shell 110 and an explosion-proof valve 120. The shell 110 is configured to cover at least part of the battery cell 210. The material of the shell 110 can be at least one of steel, aluminum, titanium or other materials. The shell 110 can be a shell body containing the battery cell 210, or a cover body sealing the shell body.

[0080] The shell 110 comprises: a mounting portion 111 and a reinforcing portion 112. The explosion-proof valve 120 is arranged on the mounting portion 111; the reinforcing portion 112 is arranged on the mounting portion 111 at a position different from the explosion-proof valve 120; the reinforcing portion 112 is arranged at a distance from the explosion-proof valve 120 in a first direction, and the reinforcing portion 112 protrudes in a second direction relative to the mounting portion 111; the second direction intersects the first direction, more specifically, the second direction is obliquely intersected with the first direction or perpendicular to each other.

[0081] It can be understood that the periphery of the explosion-proof valve 120 is surrounded by the mounting portion 111, and the explosion-proof valve 120 is connected with the mounting portion 111, which can improve the structural stability of the explosion-proof valve 120; the reinforcing portion 112 can be provided with one or at least two, and the reinforcing portion 112 is provided on the mounting portion 111 at a position different from the explosion-proof valve 120, and protrudes relative to the mounting portion 111 along the second direction, so that the reinforcing portion 112 deviates from the surface of the mounting portion 111, thereby increasing the overall cross-sectional moment of inertia of the mounting portion 111 and the reinforcing portion 112, and strengthening the structural strength of the mounting portion 111. With the improvement of the structural strength of the mounting portion 111, the volume change rate of the shell 110 can be reduced, thereby improving the stability of the shell 110. The second direction can be a direction towards the battery cell 210 or a direction away from the battery cell 210, and the protruding direction of the reinforcing portion 112 can be selected according to different design requirements.

[0082] It should be noted that the cross-sectional moment of inertia refers to the integral of the area of each microelement P of the cross section and the square of the distance from each microelement P to a specified axis Z on the cross section; the cross-sectional moment of inertia is a geometric parameter for measuring the bending resistance of the cross section; in an embodiment of the present application, referring to Figure 5 and Figure 6 The cross section here can be obtained by cutting the shell 110 with a plane parallel to the first direction and the second direction, and since the thickness of the mounting portion 111 is small, the specified axis Z can be considered to coincide with the surface of the mounting portion 111; in the above cross section, the reinforcing portion 112 is farther away from the specified axis Z relative to the mounting portion 111, so the protruding arrangement of the reinforcing portion 112 can increase the overall cross-sectional moment of inertia of the mounting portion 111 and the reinforcing portion 112.

[0083] With the above scheme, by arranging the reinforcing portion 112 on the mounting portion 111 at a position different from the explosion-proof valve 120, and the reinforcing portion 112 protruding relative to the mounting portion 111 along the second direction, the overall cross-sectional moment of inertia of the shell 110 is enhanced, thereby improving the anti-deformation ability of the shell 110, reducing the possibility of deformation of the explosion-proof valve 120 due to deformation of the shell 110, thereby improving the stability of the explosion-proof valve 120, so that the explosion-proof valve 120 can more accurately control the burst pressure and the burst trigger time, and improve the overall safety performance of the battery 10.

[0084] In a preferred example of the present application, the shell 110 is a shell body accommodating the battery cell 210.

[0085] In some embodiments of the present application, referring to Figure 2 The shell 110 includes at least two reinforcing portions 112; in the first direction, the explosion-proof valve 120 is located between the at least two reinforcing portions 112.

[0086] It can be understood that the first direction can indicate at least one of the length direction or the width direction of the mounting portion 111; for example, for the square battery 10, and in the case that the length direction of the mounting portion 111 is parallel to the length direction of the battery 10, the first direction only indicates the length direction of the mounting portion 111; the explosion-proof valve 120 is located between the at least two reinforcing portions 112 in the length direction, and due to the smaller size in the thickness direction of the square battery 10, in the width direction of the mounting portion 111, the two sides of the explosion-proof valve 120 are not arranged with the reinforcing portions 112.

[0087] For the case that the size in the length direction and the size in the thickness direction of the battery 10 are both sufficient, the first direction can indicate a two-dimensional space formed by the length direction and the width direction of the mounting portion 111, the reinforcing portions 112 can be respectively arranged on the two sides of the explosion-proof valve 120 along the length direction of the mounting portion 111, and the reinforcing portions 112 can be respectively arranged on the two sides of the explosion-proof valve 120 along the width direction of the mounting portion 111.

[0088] By using the above scheme, the explosion-proof valve 120 is arranged between the at least two reinforcing portions 112, which can simultaneously enhance the structural strength of the mounting portion 111 on both sides of the explosion-proof valve 120, thereby more evenly dispersing stress, avoiding stress concentration of the mounting portion 111, and improving the reliability of the mounting portion 111.

[0089] In some specific embodiments, with reference to Figure 2 In the first direction, the reinforcing portions 112 on both sides of the explosion-proof valve 120 are symmetrically arranged relative to the explosion-proof valve 120, thereby improving the uniformity of the anti-deformation ability on both sides of the explosion-proof valve 120.

[0090] In order to facilitate the introduction of the specific embodiments of the present application, the first direction indicates the left-right direction below, but the first direction does not have an absolute corresponding relationship with the left-right direction, and similarly, the second direction does not have an absolute corresponding relationship with the up-down direction, and the third direction does not have an absolute corresponding relationship with the front-rear direction. Moreover, the first direction, the second direction and the third direction of the present application only express relative positional relationships, which only indicate the approximate directions, rather than the absolute geometric relationships.

[0091] In an example of the present application, with reference to Figure 2 As shown in the figure, in the first direction, one reinforcing portion 112 is arranged on each side of the explosion-proof valve 120.

[0092] In another example of the present application, with reference to Figure 12As shown, in the first direction, two reinforcing portions 112 are arranged on each side of the explosion-proof valve 120 respectively; of course, more than two reinforcing portions 112 can also be arranged on each side of the explosion-proof valve 120 to meet different design requirements; especially for the square battery 10, since the length of the square battery 10 in the first direction is relatively long, arranging more reinforcing portions 112 can avoid the formation of stress concentration points on the mounting portion 111, thereby avoiding the deformation of the mounting portion 111.

[0093] In some embodiments of the present application, with reference to Figure 3 and Figure 4 In the second direction, the ratio of the size H of the reinforcing portion 112 to the thickness T of the mounting portion 111 is in the range of 1.1 to 4.

[0094] It can be understood that, since the reinforcing portion 112 protrudes relative to the mounting portion 111, the overall cross-sectional moment of inertia of the mounting portion 111 and the reinforcing portion 112 can be increased to improve the bending resistance, thereby reducing the degree of deformation of the mounting portion 111 under stress; if the size H of the reinforcing portion 112 in the second direction is too small, the increase in the cross-sectional moment of inertia is limited, and the improvement in the bending resistance of the mounting portion 111 is small; if the size of the reinforcing portion 112 in the second direction is too large, stress concentration is likely to occur at the position of the reinforcing portion 112, and the processing difficulty of the reinforcing portion 112 is increased, which is likely to cause processing defects; in addition, if the size of the reinforcing portion 112 is too large, the reinforcing portion 112 is likely to excessively occupy the mounting space of the battery cell 210 or the external space.

[0095] In the second direction, the ratio of the size H of the reinforcing portion 112 to the thickness T of the mounting portion 111 can be at least one of 1.1 to 1.2, 1.2 to 1.5, 1.5 to 2, 2 to 2.5, 2.5 to 3, 3 to 3.5, and 3.5 to 4.

[0096] By limiting the range of the ratio of the size H of the reinforcing portion 112 to the thickness T of the mounting portion 111, the above scheme ensures that the bending resistance of the mounting portion 111 is effectively improved while avoiding stress concentration, and the processing difficulty of the reinforcing portion 112 is reduced, thereby ensuring the overall processing quality of the mounting portion 111 and the reinforcing portion 112, in addition, the reinforcing portion 112 can reduce the excessive occupation of the mounting space of the battery cell 210 or the external space.

[0097] In an example of the present application, in the second direction, the ratio of the size H of the reinforcing portion 112 to the thickness T of the mounting portion 111 is in the range of 1.2 to 3, which further improves the bending resistance of the mounting portion 111 and takes into account the uniform distribution of stress.

[0098] In some embodiments of the present application, with reference to Figure 2In the third direction, the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 is in a range of 0.1 to 0.8; the third direction intersects the first direction and the second direction respectively; more specifically, the third direction intersects the first direction and the second direction respectively at an oblique angle or perpendicularly.

[0099] It can be understood that the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 affects the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 in the third direction. In the case that the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 is too small, the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 in the third direction is insufficient, which not only cannot effectively constrain the bending deformation of the mounting portion 111 in the third direction, but also makes the improvement of the structural strength too small and the bending resistance effect not obvious; in addition, the size W2 of the reinforcing portion 112 being too small also leads to lower manufacturability of the shell 110.

[0100] In the case that the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 is too large, the area occupied by the reinforcing portion 112 in the third direction is too large, which instead leads to weakening of the rigidity of the whole, is easy to cause local instability, and the area between the reinforcing portion 112 and the explosion-proof valve 120 can occur buckling wrinkles.

[0101] In the third direction, the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 can be at least one of 0.1 to 0.2, 0.2 to 0.3, 0.3 to 0.4, 0.4 to 0.5, 0.5 to 0.6, 0.6 to 0.7, 0.7 to 0.8.

[0102] By limiting the range of the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111, the reinforcing portion 112 is kept at an appropriate size, which can improve the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112, reduce the possibility of deformation of the explosion-proof valve 120 caused by deformation of the mounting portion 111, improve the phenomenon of unstable blasting pressure and blasting trigger time, and ensure the manufacturability of the shell 110.

[0103] In an example of the present application, in the third direction, the ratio of the size W2 of the reinforcing portion 112 to the size W1 of the mounting portion 111 is in a range of 0.2 to 0.6, which further improves the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 and ensures the manufacturability of the shell 110.

[0104] In some embodiments of the present application, with reference to Figure 2 In the first direction, the size of the mounting portion 111 is L1, the size of the explosion-proof valve 120 is L2, and the sum of the sizes of the reinforcing portions 112 is La; wherein,

[0105] It can be understood that La can be the sum of the sizes of all the reinforcing portions 112 in the first direction, and the ratio of La to L1-L2 affects the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 in the first direction. In the case where the ratio of La to L1-L2 is too small, the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 in the first direction is insufficient, which not only cannot effectively constrain the bending deformation of the mounting portion 111 in the first direction, but also makes the improvement range of the structural strength too small, and the bending resistance effect is not obvious; in addition, the sum of the sizes of the reinforcing portion 112 being too small also leads to lower manufacturability of the shell 110.

[0106] In the case where the ratio of La to L1-L2 is too large, in the first direction, the area occupied by the reinforcing portion 112 is too large, which may otherwise lead to weakening of the overall rigidity, and is prone to local instability, and the area between the reinforcing portion 112 and the explosion-proof valve 120 may be buckled.

[0107] The ratio of La to L1-L2 can be at least one of 0.1 to 0.2, 0.2 to 0.3, 0.3 to 0.4, 0.4 to 0.5, 0.5 to 0.6, 0.6 to 0.7, 0.7 to 0.8.

[0108] It should be noted that, for the convenience of clear display of the structure, the sizes of the shell 110, the mounting portion 111 and the explosion-proof valve 120 shown in the drawings of the present application are only for illustration and should not be understood as a limitation on the actual sizes.

[0109] By limiting the ratio of La to L1-L2, the reinforcing portion 112 is kept at a suitable size, which can improve the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112, reduce the possibility of deformation of the explosion-proof valve 120 caused by deformation of the mounting portion 111, improve the instability of the blasting pressure and the blasting trigger time, and ensure the manufacturability of the shell 110.

[0110] In an example of the present application, the ratio of La to L1-L2 is 0.3 to 0.6, which further improves the rigidity of the whole of the mounting portion 111 and the reinforcing portion 112 and ensures the manufacturability of the shell 110.

[0111] In some embodiments of the present application, with reference to Figure 2 In the third direction, the size of the explosion-proof valve 120 is D; the third direction intersects the first direction and the second direction respectively; in the first direction, the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is greater than or equal to 0.4D, and the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is less than or equal to 3D.

[0112] It can be understood that the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is related to the size D of the explosion-proof valve 120 in the third direction; when the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is less than 0.4D, the reinforcing portion 112 is too close to the explosion-proof valve 120, which is easy to cause a stress concentration point in the area near the explosion-proof valve 120, reduce the fatigue life, and interfere with the pressure release of the explosion-proof valve 120. When the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is greater than 3D, the reinforcing portion 112 is too far away from the explosion-proof valve 120, and the mounting portion 111 in the area near the explosion-proof valve 120 is not structurally reinforced, which causes the mounting portion 111 in the area near the explosion-proof valve 120 to be easily deformed under stress and affect the stability of the explosion-proof valve 120.

[0113] The distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be at least one of 0.4D to 0.5D, 0.5D to 0.7D, 0.7D to D, D to 1.5D, 1.5D to 2D, 2D to 2.5D, and 2.5D to 3D.

[0114] With the above scheme, by limiting the value range of the distance S between the reinforcing portion 112 and the explosion-proof valve 120, the distance S is adapted to the size D of the explosion-proof valve 120 in the third direction, which can effectively reduce the stress concentration in the area near the explosion-proof valve 120, allow the explosion-proof valve 120 to fully open without obstruction, and at the same time, can strengthen the structural strength of the mounting portion 111 in the area near the explosion-proof valve 120, and improve the stability of the explosion-proof valve 120, thereby achieving a balance between the structural strength and the performance of the explosion-proof valve 120.

[0115] In an example of the present application, the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be 0.5D to 2.5D, further balancing the structural strength of the installation and the performance of the explosion-proof valve 120.

[0116] Preferably, the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be 1D to 1.5D.

[0117] In other embodiments of the present application, with reference to Figure 2 In the third direction, the size of the mounting portion 111 is W1; in the first direction, the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is greater than or equal to 0.4D, and the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is less than or equal to W1.

[0118] It can be understood that the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is related to the size of the explosion-proof valve 120 and the size W1 of the mounting portion 111; in the case that the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is less than 0.4D, the reinforcing portion 112 is too close to the explosion-proof valve 120, which is easy to cause a stress concentration point in the area near the explosion-proof valve 120, reduce the fatigue life, and interfere with the pressure release of the explosion-proof valve 120. In the case that the distance S between the reinforcing portion 112 and the explosion-proof valve 120 is greater than W1, the reinforcing portion 112 is too far away from the explosion-proof valve 120, and the mounting portion 111 in the area near the explosion-proof valve 120 is not structurally reinforced, which causes the mounting portion 111 in the area near the explosion-proof valve 120 to be easy to be deformed under stress and affect the stability of the explosion-proof valve 120.

[0119] With the above scheme, by limiting the value range of the distance S between the reinforcing portion 112 and the explosion-proof valve 120, the distance S is adapted to the size D of the explosion-proof valve 120 in the third direction and the size W1 of the mounting portion 111 in the third direction, which can effectively reduce the stress concentration in the area near the explosion-proof valve 120, allow the explosion-proof valve 120 to fully open without obstruction, at the same time, can strengthen the structural strength of the mounting portion 111 in the area near the explosion-proof valve 120, and improve the stability of the explosion-proof valve 120, so as to balance the structural strength and the performance of the explosion-proof valve 120.

[0120] In an example of the present application, the value range of the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be 0.5D to W1, further balancing the structural strength and the performance of the explosion-proof valve 120.

[0121] It should be noted that the upper limit value of the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be 3D, or the upper limit value of the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be W1; or the upper limit value of the distance S between the reinforcing portion 112 and the explosion-proof valve 120 can be the smaller one of 3D and W1, which is selected according to design requirements.

[0122] In some embodiments of the present application, referring to Figure 3 The connection between the reinforcing portion 112 and the mounting portion 111 is smoothly arranged; more specifically, the connection between the reinforcing portion 112 and the mounting portion 111 is connected with a circular arc structure.

[0123] With the above scheme, by smoothly arranging the connection between the reinforcing portion 112 and the mounting portion 111, the stress concentration at the connection between the reinforcing portion 112 and the mounting portion 111 can be reduced.

[0124] In some embodiments of the present application, in the projection plane perpendicular to the second direction, the projection contour of the reinforcing portion 112 is at least one of a square, a circle, an ellipse, a racetrack type, etc.

[0125] In an example of the present application, referring to Figures 1 to 3 In a projection plane perpendicular to the second direction, the projection profile of the reinforcing portion 112 is an ellipse, in which case the reinforcing portion 112 is subjected to more uniform stress, avoiding stress concentration at the reinforcing portion 112.

[0126] In an example of the present application, referring to Figure 9 、 Figure 10 and Figure 12 In a projection plane perpendicular to the second direction, the projection profile of the reinforcing portion 112 is a square, in which case, referring to Figure 11 the middle region of the reinforcing portion 112 has a relatively flat plane, and has good support; when the reinforcing portion 112 protrudes towards the battery cell 210, the reinforcing portion 112 can better support the battery cell 210; when the reinforcing portion 112 protrudes away from the battery cell 210, the reinforcing portion 112 can be in stable contact with the outside.

[0127] In some embodiments of the present application, the mounting portion 111 is integrally formed with the reinforcing portion 112 or is connected by welding.

[0128] In an example of the present application, the reinforcing portion 112 is integrally formed with the mounting portion 111, which can simplify the processing technology of the reinforcing portion 112, and can reduce the thickness of the mounting portion 111, reduce material costs, and ensure the mechanical properties of the mounting portion 111.

[0129] In some embodiments of the present application, referring to Figure 3 、 Figure 4 and Figure 6 the mounting portion 111 has a first surface 111a and a second surface 111b.

[0130] The first surface 111a is configured to be disposed away from the battery cell 210; the second surface 111b is configured to be disposed towards the battery cell 210; the first surface 111a and the second surface 111b are oppositely disposed in the second direction; the reinforcing portion 112 is recessed relative to the first surface 111a, and the reinforcing portion 112 forms a protrusion relative to the second surface 111b.

[0131] It can be understood that the first surface 111a is an outer surface of the mounting portion 111, and the second surface 111b is an inner surface of the mounting portion 111, and the spacing between the first surface 111a and the second surface 111b is the thickness of the mounting portion 111.

[0132] With the above scheme, by recessing the reinforcing portion 112 relative to the first surface 111a and forming a protrusion of the reinforcing portion 112 relative to the second surface 111b, the shell 110 can support the battery cell 210 after being assembled with the battery cell 210, so that the battery cell 210 maintains a proper distance from the mounting portion 111, and the battery cell 210 does not directly contact the second surface 111b, thereby forming a pressure relief channel 10a between the mounting portion 111 and the battery cell 210; the electrolyte and gas can act on the explosion-proof valve 120 through the pressure relief channel 10a, so that the burst pressure can be more accurately controlled, and the safety can be improved; and after the explosion-proof valve 120 bursts, the electrolyte and gas can quickly flow to the explosion-proof valve 120 through the pressure relief channel 10a and be discharged through the explosion-proof valve 120, thereby reducing the risk of explosion of the battery 10.

[0133] In addition, the reinforcing portion 112 is arranged in the above manner, so that the reinforcing portion 112 does not exceed the first surface 111a, so that the placement direction of the battery 10 is not limited, and the requirement of inverting the battery cell 210 can be met.

[0134] In some embodiments of the present application, the reinforcing portion 112 is recessed relative to the second surface 111b, and the reinforcing portion 112 forms a protrusion relative to the first surface 111a. In this embodiment, the reinforcing portion 112 does not occupy the arrangement space of the battery cell 210, and the structural strength of the mounting portion 111 is improved while the energy density of the battery 10 is ensured.

[0135] In some embodiments of the present application, referring to Figure 2 The battery shell 100 further comprises a weakening structure 130. The weakening structure 130 is connected between the explosion-proof valve 120 and the mounting portion 111; and in the second direction, at least part of the weakening structure 130 has a thickness smaller than that of the mounting portion 111.

[0136] With the above scheme, by arranging the weakening structure 130 and at least part of the weakening structure 130 having a thickness smaller than that of the mounting portion 111, the pressure that the weakening structure 130 can withstand is smaller than that of the mounting portion 111, which is beneficial to the burst of the explosion-proof valve 120; when the temperature and pressure inside the battery 10 reach a set value, the explosion-proof valve 120 can be broken, so that the gas and substances inside the battery 10 can be discharged to the outside of the battery 10 through the explosion-proof valve 120, thereby preventing the battery 10 from exploding.

[0137] In some specific embodiments, the weakening structure 130 can be a structure of thinning or forming a groove 131 in a partial region between the mounting portion 111 and the explosion-proof valve 120.

[0138] In some specific embodiments, the surface of the explosion-proof valve 120 can also be provided with a notch. When the internal pressure of the battery 10 reaches a set value, the explosion-proof valve 120 will break at the notch and release pressure to prevent the battery 10 from exploding.

[0139] In some embodiments of the present application, with reference to Figure 6 , the weakening structure 130 comprises a groove 131. The groove 131 is formed between the explosion-proof valve 120 and the mounting portion 111, and the groove 131 is arranged around the explosion-proof valve 120.

[0140] It can be understood that the groove 131 can be continuously arranged around the explosion-proof valve 120, or a plurality of grooves 131 arranged at intervals around the explosion-proof valve 120.

[0141] With the above scheme, by providing the groove 131 between the explosion-proof valve 120 and the mounting portion 111, and arranging the groove 131 around the explosion-proof valve 120, the explosion-proof valve 120 and the mounting portion 111 are separated, and the processing difficulty can be reduced.

[0142] It should be noted that the groove 131 can be formed in at least one of the first surface 111a or the second surface 111b, and can be selected according to the design requirements of the explosion-proof valve 120.

[0143] In an example of the present application, with reference to Figure 6 , the groove 131 is formed in the first surface 111a; in this example, the two sides of the explosion-proof valve 120 are arranged flush with respect to the first surface 111a and the second surface 111b, respectively. In combination with the above groove 131, the above groove 131 is processed at a predetermined position of the mounting portion 111, so as to realize the processing of the explosion-proof valve 120; or the explosion-proof valve 120 can be convex with respect to the first surface 111a, which is beneficial to the explosion of the explosion-proof valve 120.

[0144] In another example of the present application, the groove 131 is formed in the second surface 111b; in this example, the explosion-proof valve 120 can be convex with respect to the second surface 111b, which is beneficial to the explosion of the explosion-proof valve 120.

[0145] In some embodiments of the present application, the explosion-proof valve 120 and the mounting portion 111 are fixedly connected by integral molding or welding.

[0146] Considering that the welding process of the explosion-proof valve 120 and the mounting portion 111 is complex, and the wall thickness of the mounting portion 111 needs to be thick, the material cost is high; in addition, the welding has a heat-affected zone, which will cause the mechanical properties of the mounting portion 111 to be weakened to a certain extent. In an example of the present application, with reference to Figure 2 , Figure 5 and Figure 6The explosion-proof valve 120 is integrally formed with the mounting portion 111, which can simplify the processing technology of the explosion-proof valve 120, reduce the thickness of the mounting portion 111, and reduce the material cost, and the integrally formed processing manner has little influence on the mechanical properties of the mounting portion 111.

[0147] In some embodiments of the present application, referring to Figure 1 and Figure 3 The shell 110 further comprises a side frame portion 113. The side frame portion 113 is connected to the edges of the reinforcing portion 112, and the side frame portion 113 and the mounting portion 111 surround a receiving space 110a for accommodating the battery cell 210.

[0148] With the above scheme, the side frame portion 113 and the mounting portion 111 cooperate to form the receiving space 110a, which is conducive to the assembly of the shell 110 and the battery cell 210, and simplifies the processing technology of the shell 110.

[0149] In an example of the present application, referring to Figure 1 and Figure 3 The side frame portion 113 and the mounting portion 111 form a ring-shaped frame structure, so that the shell 110 can be arranged around the battery cell 210, and the mounting portion 111 constitutes one side of the shell 110.

[0150] In some embodiments of the present application, the shell 110 can only include the mounting portion 111 and the reinforcing portion 112, that is, the shell 110 can not be provided with the side frame portion 113. In this embodiment, the shell 110 only covers one side of the battery cell 210; the shell 110 can be understood as at least part of the cover plate assembly of the battery 10.

[0151] In some embodiments of the present application, referring to Figure 7 and Figure 8 The present application provides a battery 10 comprising a battery cell 210 and a battery shell 100 as described above.

[0152] The battery 10 has all the beneficial effects of the battery shell 100 described above, which will not be repeated here.

[0153] In some embodiments of the present application, referring to Figure 7 and Figure 8 The reinforcing portion 112 abuts against the battery cell 210 to form a pressure relief channel 10a between the battery cell 210 and the mounting portion 111; the pressure relief channel 10a is in communication with the explosion-proof valve 120.

[0154] By adopting the above scheme, the battery cell 210 and the mounting portion 111 are connected through the abutment of the reinforcing portion 112 and the battery cell 210 to form the pressure relief channel 10a, the electrolyte and the gas can act on the explosion-proof valve 120 through the pressure relief channel 10a, the burst pressure can be more accurately controlled, and the safety is improved; and after the explosion-proof valve 120 bursts, the electrolyte and the gas can flow to the explosion-proof valve 120 through the pressure relief channel 10a and be discharged through the explosion-proof valve 120, thereby reducing the risk of explosion of the battery 10.

[0155] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by applying specific examples; the above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, according to the idea of the present application, the specific implementation manner and application range will be changed by the person skilled in the art, and the above description should not be understood as the limitation of the present application.

Claims

1. A battery casing, characterized in that, The battery casing includes: a housing and an explosion-proof valve, the housing being configured to cover at least a portion of the battery cell; The housing includes: The explosion-proof valve is installed in the mounting section; A reinforcing section is provided on the mounting section at a position different from that of the explosion-proof valve; The reinforcing part and the explosion-proof valve are spaced apart in a first direction, and the reinforcing part protrudes relative to the mounting part in a second direction; The second direction intersects with the first direction.

2. The battery casing according to claim 1, characterized in that, The housing includes at least two of the aforementioned reinforcing sections; In the first direction, the explosion-proof valve is located between at least two of the reinforcing parts.

3. The battery casing according to claim 1 or 2, characterized in that, In the second direction, the ratio of the dimension H of the reinforcing part to the thickness T of the mounting part ranges from 1.1 to 4.

4. The battery casing according to any one of claims 1 to 3, characterized in that, In the third direction, the ratio of the size W2 of the reinforcing part to the size W1 of the mounting part ranges from 0.1 to 0.8; The third direction intersects with the first direction and the second direction, respectively.

5. The battery casing according to any one of claims 1 to 4, characterized in that, In the first direction, the size of the mounting part is L1, the size of the explosion-proof valve is L2, and the sum of the sizes of the reinforcing part is La; in, 6. The battery casing according to any one of claims 1 to 5, characterized in that, In the third direction, the explosion-proof valve has a dimension of D, and the mounting part has a dimension of W1; The third direction intersects with the first direction and the second direction respectively; In the first direction, the distance S between the reinforcing part and the explosion-proof valve is greater than or equal to 0.4D; and / or, In the first direction, the distance S between the reinforcing part and the explosion-proof valve is less than or equal to 3D; and / or, in the first direction, the distance S between the reinforcing part and the explosion-proof valve is less than or equal to W1.

7. The battery casing according to any one of claims 1 to 6, characterized in that, The connection between the reinforcing part and the mounting part is smoothly arranged.

8. The battery casing according to any one of claims 1 to 7, characterized in that, The reinforcing part and the mounting part are integrally formed.

9. The battery casing according to any one of claims 1 to 8, characterized in that, The mounting part has: The first surface is configured to face away from the battery cell; The second surface is configured to face the battery cell; The first surface and the second surface are disposed opposite to each other in the second direction; The reinforcing portion is recessed relative to the first surface, and the reinforcing portion forms a protrusion relative to the second surface.

10. The battery casing according to any one of claims 1 to 9, characterized in that, The battery casing also includes: A weakened structure is connected between the explosion-proof valve and the mounting part; In the second direction, at least a portion of the thickness of the weakening structure is less than the thickness of the mounting portion.

11. The battery casing according to claim 10, characterized in that, The weakening structure includes: A groove is formed between the explosion-proof valve and the mounting portion; The groove is arranged around the explosion-proof valve.

12. The battery casing according to any one of claims 1 to 11, characterized in that, The explosion-proof valve is integrally formed with the mounting part.

13. The battery casing according to any one of claims 1 to 12, characterized in that, The housing also includes: The side frame is connected to the edge of the reinforcing part; The side frame and the mounting portion together form a receiving space for accommodating the battery cell.

14. A battery, characterized in that, Includes the battery cell and the battery casing as described in any one of claims 1 to 13.

15. The battery according to claim 14, characterized in that, The reinforcing part abuts against the battery cell to form a pressure relief channel between the battery cell and the mounting part; The pressure relief channel is connected to the explosion-proof valve.

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