Battery

Abstract

The utility model discloses a battery. The battery comprises a shell assembly and a battery cell assembly, wherein an installation cavity is formed in the shell assembly, a pressure relief groove is formed in the outer surface of the shell assembly, the pressure relief groove is sunken in the direction from the outer surface of the shell assembly to the installation cavity, and the pressure relief groove is filled with a supporting part. And the battery core assembly is arranged in the mounting cavity. The battery disclosed by the utility model at least solves the problem that when the battery is impacted by an external force in the prior art, the shell provided with the pressure relief structure is easy to crack under the impact of the external force.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular, to a battery. Background Art

[0002] Lithium-ion batteries have high energy density and good cycle performance, and are widely used in wearable digital products, electric vehicles and other products. Among them, hard shell shells have advantages such as light weight and high impact resistance, which makes them have significant advantages in mass energy density and safety, and are a promising packaging form.

[0003] In existing hard-shell batteries, compared with the pressure relief structure of polymer seals that melt under heat, setting a stress-weakened groove on the shell as a pressure relief structure is a lower-cost and more manufacturable method with a prospect of large-scale application. However, the setting of the pressure relief structure reduces the structural strength of the shell. When the battery falls or is impacted by other external forces, the shell where the pressure relief structure is set is prone to rupture under the impact of external forces. Utility Model Content

[0004] The main purpose of the present application is to provide a battery to at least solve the problem in the prior art that when the battery is impacted by external force, the shell provided with a pressure relief structure is easily broken under the impact of the external force.

[0005] According to one aspect of the present application, a battery is provided, comprising:

[0006] A housing component, wherein a mounting cavity is disposed in the housing component, a pressure relief groove is provided on the outer surface of the housing component, the pressure relief groove is recessed along the direction from the outer surface of the housing component to the mounting cavity, and a support portion is filled in the pressure relief groove;

[0007] A battery cell assembly is arranged in the installation cavity.

[0008] Furthermore, the supporting portion includes a hot-melt layer.

[0009] Furthermore, the hot melt layer includes at least one of the following five types: an epoxy resin layer, a polyacrylic acid layer, a polypropylene layer, a two-liquid mixed hardening adhesive layer, and a shadowless adhesive layer.

[0010] Furthermore, the housing assembly includes a cover body and a bottom shell, the bottom shell has a groove, the cover body is arranged on the bottom shell and seals the groove to form the installation cavity, and the pressure relief groove is arranged on a side of the cover body away from the installation cavity.

[0011] Further, a fixing portion is connected between the battery cell assembly and the cover body, and along the direction from the bottom shell to the cover body, the projection surface of the fixing portion and the projection surface of the pressure relief groove do not overlap each other, or

[0012] A fixing portion is connected between the battery cell assembly and the cover body, and along the direction from the bottom shell to the cover body, a projection surface of the fixing portion at least partially overlaps with a projection surface of the pressure relief groove.

[0013] Further, the pressure relief groove comprises a first straight section, a first arc section and a second straight section, and the first arc section is connected between the first straight section and the second straight section;

[0014] The cover body comprises a first side wall, an arcuate side wall and a second side wall, the arcuate side wall is connected between the first side wall and the second side wall, the first side wall is arranged parallel to the first straight section, and the second side wall is arranged parallel to the second straight section;

[0015] The fixing portion includes a fixing ring, which is arranged on a side of the battery cell close to the cover body, and the fixing ring includes a third straight segment, a second arc segment and a fourth straight segment, the second arc segment is connected between the third straight segment and the fourth straight segment, the third straight segment is arranged parallel to the first straight segment, and the fourth straight segment is arranged parallel to the second straight segment.

[0016] Furthermore, along the concave direction of the pressure relief groove, the maximum depth T1 of the groove bottom of the pressure relief groove corresponding to the first straight section and the thickness T4 of the cover body satisfy the relationship: 1 / 4<T1 / T4≤1 / 3; and / or,

[0017] Along the concave direction of the pressure relief groove, the maximum depth T1 of the groove bottom of the pressure relief groove corresponding to the second straight section and the thickness T4 of the cover body satisfy the relationship: 1 / 4<T1 / T4≤1 / 3; and / or,

[0018] Along the concave direction of the pressure relief groove, the maximum depth T1 of the groove bottom of the pressure relief groove corresponding to the first arc segment and the thickness T4 of the cover body satisfy the relationship: 1 / 3<T1 / T4≤2 / 3.

[0019] Further, the curvature radius r1 of the first arc segment, the curvature radius r2 of the arc side wall, and the curvature radius r3 of the second arc segment satisfy the relationship: r1:r2:r3=(1.9-2.1):(0.9-1.1):(0.4-0.6); and / or,

[0020] The minimum distance M1 between the first arc segment and the second arc segment is greater than the minimum distance M2 between the first arc segment and the arc-shaped side wall; and / or,

[0021] The minimum distance M3 between the first straight section and the third straight section is greater than the minimum distance M4 between the first straight section and the first side wall; and / or,

[0022] A minimum distance M5 between the second straight section and the fourth straight section is greater than a minimum distance M6 between the second straight section and the second side wall.

[0023] Further, the pressure relief groove comprises a plurality of first pressure relief segments which are segmented and spaced apart, and at least one of the first pressure relief segments is filled with the support portion; or,

[0024] The pressure relief groove is a second pressure relief section which is continuously arranged, and the support portion is filled in the second pressure relief section.

[0025] Furthermore, the shell assembly includes a main body section and a raised section, the raised section protrudes in a direction away from the main body section and is arranged in an L-shape with the main body section, the main body section includes a third side wall, the raised section includes a fourth side wall, an arc-shaped wall is connected between the third side wall and the fourth side wall, and the pressure relief groove is located near the arc-shaped wall.

[0026] Furthermore, the third side wall is arranged in parallel with the first straight section, and the fourth side wall is arranged in parallel with the second straight section.

[0027] Furthermore, a ratio of a minimum distance H between a center of a side of the cover body facing away from the installation cavity and the pressure relief groove to a width L of the cover body along the first direction satisfies the relationship: 1 / 2≤H / L≤2 / 3.

[0028] Furthermore, along the recessed direction of the pressure relief groove, the cross-sectional area of ​​the pressure relief groove gradually decreases, and the support portion is connected to the inner side wall of the pressure relief groove.

[0029] Furthermore, along the concave direction of the pressure relief groove, the maximum depth T1 of the pressure relief groove and the maximum filling height T2 of the support portion satisfy the relationship: 0<T2≤1.1T1; and / or,

[0030] The cross-sectional area S1 of the pressure relief groove and the cross-sectional area S2 of the support portion satisfy the relationship: 0.5≤S2 / S1≤1.1.

[0031] Further, the maximum width L1 of the pressure relief groove satisfies the relationship: 0.05mm≤L1≤0.5mm; and / or,

[0032] Along the concave direction of the pressure relief groove, the maximum depth T1 of the pressure relief groove and the thickness T3 of the housing component satisfy the relationship: 0.5≤T1 / T3≤0.9; and / or,

[0033] Along the concave direction of the pressure relief groove, the minimum distance T5 between the groove bottom of the pressure relief groove and the inner wall surface of the shell component and the thickness T3 of the shell component satisfy the relationship: 0.15≤T5 / T3≤0.5.

[0034] Compared with the prior art, the present application provides a support portion in the pressure relief groove, which can improve the structural strength of the pressure relief groove. At the same time, when the housing assembly is impacted by an external force, the support portion can also disperse the impact force on the pressure relief groove to other positions of the housing assembly, thereby preventing the pressure relief groove from being broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0036] Figure 1 A schematic diagram of the explosion structure of the battery disclosed in this application;

[0037] Figure 2 A cross-sectional view of the battery disclosed in this application;

[0038] Figure 3 A schematic diagram of the structure of the pressure relief groove disclosed in this application;

[0039] Figure 4 Another structural schematic diagram of the pressure relief groove disclosed in this application;

[0040] Figure 5 A size marking diagram of the pressure relief groove disclosed in this application;

[0041] Figure 6 Another dimension marking diagram of the pressure relief groove disclosed in the present application;

[0042] Figure 7 This is a schematic diagram of the structure of the cover body disclosed in this application;

[0043] Figure 8 A dimension marking diagram of the cover disclosed in this application;

[0044] Fig. 9 A schematic diagram of the structure of another battery disclosed in this application;

[0045] Fig.10 It is a structural schematic diagram of the first pressure relief section disclosed in this application;

[0046] Fig.11 for Fig.10 Schematic diagram of the enlarged area I in the middle.

[0047] The above drawings include the following reference numerals:

[0048] 10. Shell assembly; 11. Cover body; 12. Bottom shell; 13. Main body section; 14. Raised section; 20. Cell assembly; 30. Pressure relief groove; 31. First straight section; 32. First arc-shaped section; 33. Second straight section; 40. Support portion; 50. Fixing portion; 51. Third straight section; 52. Second arc-shaped section; 53. Fourth straight section; 111. First side wall; 112. Arc-shaped side wall; 113. Second side wall; 201. Ear portion; 301. First pressure relief section. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0052] See also Figures 1 to 8 As shown, according to an embodiment of the present application, a battery is provided, including a housing assembly 10 and a battery cell assembly 20.

[0053] The housing assembly 10 is provided with an installation cavity, and a pressure relief groove 30 is provided on the outer surface of the housing assembly 10. The pressure relief groove 30 is recessed from the outer surface of the housing assembly 10 to the installation cavity, and the pressure relief groove 30 is filled with a support portion 40. The battery cell assembly 20 is provided in the installation cavity.

[0054] Compared with the prior art, the present embodiment provides a support portion 40 in the pressure relief groove 30, and the support portion 40 can improve the structural strength of the pressure relief groove 30. At the same time, when the housing assembly 10 is impacted by an external force, the support portion 40 can also disperse the impact force on the pressure relief groove 30 to other positions of the housing assembly 10, thereby preventing the pressure relief groove 30 from being broken.

[0055] Furthermore, the support portion 40 includes a hot melt layer. Specifically, at room temperature, the hot melt layer can enhance the structural strength of the pressure relief groove 30, prevent the pressure relief groove 30 from being ruptured due to external impact on the battery, and prevent the explosion-proof structure of the battery from being damaged when not in operation. When the battery cell assembly 20 heats up and expands abnormally and generates gas, the thermal shock causes the hot melt layer to melt, and the structural strength of the pressure relief groove 30 is reduced. At this time, under the action of the thermal shock of the battery cell assembly 20, the internal stress of the pressure relief groove 30 rises sharply, and eventually ruptures, allowing the gas generated in the battery cell assembly 20 to be released, thereby preventing the battery from exploding.

[0056] Furthermore, the hot melt layer includes at least one of the following five types: an epoxy resin layer, a polyacrylic acid layer, a polypropylene layer, a two-liquid mixed hardening adhesive layer, and a shadowless adhesive layer.

[0057] Specifically, the melting points of the epoxy resin layer, the polyacrylic acid layer, the polypropylene layer, the two-liquid mixed hardened adhesive layer, and the shadowless adhesive layer are all between 115°C and 135°C, which is close to the temperature range when the battery core abnormally heats up and expands to produce gas, and will not cause the heat released by the battery core during normal operation to melt the hot melt layer. In addition, the epoxy resin layer, the polyacrylic acid layer, the polypropylene layer, the two-liquid mixed hardened adhesive layer, and the shadowless adhesive layer can all improve the strength of the pressure relief groove 30, and have good force transmission performance, so that the impact resistance of the pressure relief groove 30 is effectively improved.

[0058] Furthermore, the housing assembly 10 includes a cover body 11 and a bottom shell 12, the bottom shell 12 has a groove, the cover body 11 is covered on the bottom shell 12 and seals the groove to form an installation cavity, and the pressure relief groove 30 is arranged on a side of the cover body 11 away from the installation cavity.

[0059] In this embodiment, the arrangement of the cover 11 and the bottom shell 12 facilitates maintenance of the battery. Specifically, if the cover 11 is broken due to excessive external impact, it can be replaced with a cover 11 of the same specification without replacing the entire housing assembly 10. Similarly, when the battery cell assembly 20 is damaged, the battery cell assembly 20 can also be replaced separately.

[0060] As attached Figure 2 and attached Figure 7As shown, a fixing portion 50 is connected between the battery cell assembly 20 and the cover body 11, and along the direction from the bottom shell 12 to the cover body 11, the projection surface of the fixing portion 50 and the projection surface of the pressure relief groove 30 do not overlap with each other, or a fixing portion 50 is connected between the battery cell assembly 20 and the cover body 11, and along the direction from the bottom shell 12 to the cover body 11, the projection surface of the fixing portion 50 and the projection surface of the pressure relief groove 30 at least partially overlap.

[0061] Specifically, after the battery cell assembly 20 is assembled in the groove of the bottom shell 12, the cover body 11 is connected to the battery cell assembly 20 through the fixing part 50, so that the battery cell assembly 20 can conduct heat to the cover body 11, so that when the battery cell assembly 20 is abnormally heated and expands to produce gas, the pressure relief groove 30 on the cover body 11 can be quickly broken to relieve the pressure of the battery cell assembly 20. At the same time, in this embodiment, the projection surface of the fixing part 50 and the projection surface of the pressure relief groove 30 should be arranged alternately to avoid the fixing part 50 from affecting the pressure relief groove 30 on the cover body 11, that is, the fixing part 50 is connected to the corresponding surface of the pressure relief groove 30, which will cause the pressure relief groove 30 to fail to open in time when the battery cell assembly 20 is abnormally heated and expands to produce gas, so that there is a safety hazard in the battery. Of course, the projection surface of the fixed part 50 may also partially overlap with the projection surface of the pressure relief groove 30. For example, the projection surface at the stress dispersion point of the pressure relief groove 30 may overlap with the projection surface of the fixed part 50, while the projection surface at the stress concentration point of the pressure relief groove 30 does not overlap with the projection surface of the fixed part 50. When the battery needs to release pressure, the pressure relief groove 30 can still rupture quickly to release pressure, thereby avoiding the fixed part 50 from affecting the pressure relief groove 30.

[0062] Further, the pressure relief groove 30 includes a first straight section 31, a first arc section 32 and a second straight section 33, and the first arc section 32 is connected between the first straight section 31 and the second straight section 33. The cover body 11 includes a first side wall 111, an arcuate side wall 112 and a second side wall 113, and the arcuate side wall 112 is connected between the first side wall 111 and the second side wall 113. The first side wall 111 is arranged parallel to the first straight section 31, and the second side wall 113 is arranged parallel to the second straight section 33. The fixing portion 50 includes a fixing ring, which is arranged on a side of the battery cell close to the cover body 11, and the fixing ring includes a third straight section 51, a second arc section 52 and a fourth straight section 53, and the second arc section 52 is connected between the third straight section 51 and the fourth straight section 53, and the third straight section 51 is arranged parallel to the first straight section 31, and the fourth straight section 53 is arranged parallel to the second straight section 33.

[0063] Specifically, when the battery cell assembly 20 is abnormally heated and expands to generate gas, the cover 11 bulges in the direction away from the installation cavity, thereby driving the first side wall 111, the arc-shaped side wall 112 and the second side wall 113 of the cover 11 to shrink toward the bulge of the cover 11, so that the stress at the shrinkage point increases. At this time, the stress at the shrinkage point is concentrated on the first straight section 31 and the second straight section 33 respectively, and then the first straight section 31 and the second straight section 33 guide the stress to the first arc section 32, so that the pressure relief groove 30 at the first arc section 32 is broken, so that the battery is quickly depressurized. At the same time, the third straight section 51 and the fourth straight section 53 of the fixing ring are parallel to the first straight section 31 and the second straight section 33 respectively, so as to avoid the fixing ring blocking the pressure relief groove 30 when the outer wall of the cover 11 shrinks inward, so that the pressure relief groove 30 is difficult to break. In this embodiment, the fixing ring is a ring body formed by applying the battery fixing glue on the side of the battery cell assembly 20 close to the cover 11.

[0064] Furthermore, along the concave direction of the pressure relief groove 30, the maximum depth T1 of the groove bottom of the pressure relief groove 30 corresponding to the first straight section 31 and the thickness T4 of the cover body 11 satisfy the relationship: 1 / 4<T1 / T4≤1 / 3. When T1 / T4 satisfies the above relationship, the first straight section 31 can concentrate the stress on the cover body 11 into the pressure relief groove 30. At the same time, when the first straight section 31 guides the stress, it is not easy to be affected by the stress so that the pressure relief groove 30 of the first straight section 31 is broken. On the contrary, if T1 / T4≤1 / 4, the stress on the pressure relief groove 30 of the first straight section 31 is small, and it is not easy to introduce the stress into the pressure relief groove 30 of the first arc section 32. If T1 / T4>1 / 3, the pressure relief groove 30 at the first straight section 31 is too deep, which may cause the pressure relief groove 30 at the first straight section 31 to break when the cover body 11 is impacted by external force. In this embodiment, the value of T1 / T4 can be 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, or 1 / 3.

[0065] Based on the same principle as above, along the concave direction of the pressure relief groove 30, the maximum depth T1 of the groove bottom of the pressure relief groove 30 corresponding to the second straight section 33 and the thickness T4 of the cover body 11 satisfy the relationship: 1 / 4<T1 / T4≤1 / 3. In this embodiment, the value of T1 / T4 can be 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 1 / 3.

[0066] In addition, along the concave direction of the pressure relief groove 30, the maximum depth T1 of the groove bottom of the pressure relief groove 30 corresponding to the first arc segment 32 and the thickness T4 of the cover body 11 satisfy the relationship: 1 / 3<T1 / T4≤2 / 3. When T1 / T4 satisfies the above relationship, the pressure relief groove 30 corresponding to the first arc segment 32 is subjected to large stress and is easy to rupture when the battery cell assembly 20 expands, and the battery can be depressurized in time. When T1 / T4≤1 / 3, the stress at the pressure relief groove 30 corresponding to the first arc segment 32 is relatively small, which may cause the pressure relief groove 30 at the first arc segment 32 to fail to rupture in time when the battery cell assembly 20 expands. When T1 / T4>2 / 3, the pressure relief groove 30 at the first arc segment 32 is too deep, which may cause the pressure relief groove 30 to rupture when impacted by external force. In this embodiment, the value of T1 / T4 can be 0.34, 0.38, 0.42, 0.46, 0.5, 0.54, 0.58, 0.62 and 2 / 3.

[0067] In this embodiment, the battery cell assembly 20 further includes a lug 201, and the battery preparation process includes: installing the battery cell assembly 20 in the groove, providing a positive pole column and a negative pole column on the bottom shell 12, welding the lug 201 to the positive pole column and the negative pole column, and then welding the cover 11 to the bottom shell 12. Then, the battery is placed in an oven for a certain period of time to remove moisture in the battery, and finally, an electrolyte is injected into the battery cell of the battery cell assembly 20, and the electrolyte is sealed.

[0068] In order to avoid the influence of the arc side wall 112 and the second arc segment 52 on the first arc segment 32, that is, to avoid the curvature radius r3 of the second arc segment 52 of the fixing ring being too large, so that the second arc segment 52 and the first arc segment 32 are too close, so as to enhance the structural strength of the pressure relief groove 30 at the first arc segment 32, and to avoid the influence of the pressure relief groove 30 at the first arc segment 32 during the welding of the cover body 11, that is, to avoid the curvature radius r2 of the arc side wall 112 of the cover body being too large, so that the arc side wall 112 and the first arc segment 32 are too close. The curvature radius r1 of the first arc segment 32, the curvature radius r2 of the arc side wall 112, and the curvature radius r3 of the second arc segment 52 satisfy the relationship: r1: r2: r3 = (1.9-2.1): (0.9-1.1): (0.4-0.6). In this embodiment, the values ​​of r1:r2:r3 can be 1.9:0.9:0.4, 2.1:1.1:0.6, 2:1:0.5, 1.9:1.1:0.6 and 2.1:0.9:0.6, etc.

[0069] Furthermore, a minimum distance M1 between the first arc segment 32 and the second arc segment 52 is greater than a minimum distance M2 between the first arc segment 32 and the arc-shaped side wall 112 .

[0070] In this embodiment, if the distance between the first arc segment 32 and the second arc segment 52 is too small, the second arc segment 52 of the fixing ring may increase the structural strength of the pressure relief groove 30 at the first arc segment 32, resulting in the pressure relief groove 30 at the first arc segment 32 being unable to open in time when the battery needs to release pressure.

[0071] Optionally, the minimum distance M3 between the first straight section 31 and the third straight section 51 is greater than the minimum distance M4 between the first straight section 31 and the first side wall 111. Specifically, if the third straight section 51 is too close to the first straight section 31, the stress on the pressure relief groove 30 at the first straight section may be reduced, and the stress cannot be transferred too much to the first arc section 32. Similarly, the minimum distance M4 between the second straight section 33 and the fourth straight section 53 is greater than the minimum distance M6 between the second straight section 33 and the second side wall 113, so as to avoid the fixing ring from affecting the second straight section 33.

[0072] In some embodiments, as shown in the attached Fig.10 and attached Fig.11 As shown, the pressure relief groove 30 includes a plurality of first pressure relief segments 301 that are segmented and spaced apart, and at least one first pressure relief segment 301 is filled with a support portion 40. Specifically, in order to avoid excessive reduction in the structural strength of the cover body 11 due to the setting of the pressure relief groove 30 being too long, the pressure relief groove 30 is segmented into a plurality of first pressure relief segments 301 in this embodiment.

[0073] In order to increase the stress of the pressure relief groove 30, the pressure relief groove 30 can be quickly broken when the battery expands. Figure 1 To Attachment Fig. 9 As shown, the pressure relief groove 30 is a second pressure relief section that is continuously arranged, and the support portion 40 is filled in the second pressure relief section.

[0074] Furthermore, the ratio of the minimum distance H between the center of the side of the cover body 11 facing away from the installation cavity and the pressure relief groove 30 to the width L of the cover body 11 along the first direction satisfies the relationship: 1 / 2≤H / L≤2 / 3.

[0075] In a specific embodiment, the side of the cover 11 away from the installation cavity is rectangular. When the battery cell assembly 20 is abnormally heated and expands to produce gas, the center of the cover 11 bulges away from the installation cavity, and the edge of the cover 11 shrinks toward the middle. At this time, the stress on the edge of the cover 11 close to the center is relatively large, that is, when the above relationship is satisfied, the stress on the location where the pressure relief groove 30 is set is relatively large, which can cause the pressure relief groove 30 to rupture quickly and release pressure in time. The value of H / L can be 1 / 2, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64 and 2 / 3. If H / L is greater than 2 / 3, the pressure relief groove 30 is set too close to the outer edge of the cover 11, which may affect the welding of the cover 11; if H / L is less than 1 / 2, the pressure relief groove is set too close to the center of the cover, which is easy to interfere with the fixing part 50. It is worth mentioning that, in other embodiments, the side of the cover body 11 facing away from the installation cavity may be a relatively regular shape such as a square, a regular pentagon, a regular hexagon, or a rhombus.

[0076] Furthermore, along the recessed direction of the pressure relief groove 30 , the cross-sectional area of ​​the pressure relief groove 30 gradually decreases, and the support portion 40 is connected to the inner side wall of the pressure relief groove 30 .

[0077] Specifically, the cross-sectional area of ​​the pressure relief groove 30 refers to the area of ​​the cross-section of the pressure relief groove 30 cut off perpendicularly to the extension line of the pressure relief groove 30. Along the recessed direction of the pressure relief groove 30, the cross-sectional area of ​​the pressure relief groove 30 gradually decreases to concentrate the stress at the bottom of the pressure relief groove 30. When the battery cell assembly 20 abnormally heats up and expands to produce gas, the pressure relief groove 30 can rupture in time to relieve the pressure on the battery.

[0078] Furthermore, along the concave direction of the pressure relief groove 30 , the maximum depth T1 of the pressure relief groove 30 and the maximum filling height T2 of the support portion 40 satisfy the relationship: 0<T2≤1.1T1.

[0079] In this embodiment, the maximum filling height T2 of the support portion 40 may be slightly higher than the maximum depth T1 of the pressure relief groove 30. Specifically, since the battery is usually assembled in other equipment, when the maximum filling height T2 of the support portion 40 is slightly higher than the maximum depth T1 of the pressure relief groove 30, the other equipment will conflict with the support portion 40, and the support portion 40 will transfer the supporting force provided by the equipment to the pressure relief groove 30, thereby increasing the stress at the pressure relief groove 30, so that when the battery cell assembly 20 is abnormally heated and expands to produce gas, the pressure relief groove 30 can quickly rupture to relieve the pressure of the battery.

[0080] Optionally, the cross-sectional area S1 of the pressure relief groove 30 and the cross-sectional area S2 of the support portion 40 satisfy the relationship: 0.5≤S2 / S1≤1.1. Similarly, the support portion 40 as a whole may slightly protrude from the pressure relief groove 30. In addition, the pressure relief groove 30 may be partially filled with the support portion 40 or completely filled with the support portion 40. If the pressure relief groove 30 is filled with fewer support portions 40, that is, when S2 / S1<0.5, the structural strength of the pressure relief groove 30 is relatively low, and the pressure relief groove 30 may be easily broken when impacted by external force. If the support portion 40 is filled too much in the pressure relief groove 30, that is, when S2 / S1>1.1, the area of ​​the support portion 40 protruding from the pressure relief groove 30 is too large, which may easily interfere with the installed equipment. In this embodiment, the values ​​of S2 / S1 may be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 and 1.1.

[0081] Furthermore, the maximum width L1 of the pressure relief groove 30 satisfies the relationship: 0.05mm≤L1≤0.5mm. When L1 satisfies the above range, the pressure relief groove 30 will not be set too wide, thereby causing the overall strength of the housing assembly 10 to decrease. At the same time, the pressure relief groove 30 will not be set too narrow, thereby causing the pressure relief groove 30 to fail to produce a normal pressure relief effect. The value of L1 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4, 0.45mm and 0.5mm.

[0082] Furthermore, along the direction in which the pressure relief groove 30 is recessed, the maximum depth T1 of the pressure relief groove 30 and the thickness T3 of the housing assembly 10 satisfy the relationship: 0.5≤T1 / T3≤0.9.

[0083] Specifically, when T1 / T3 satisfies the above relationship, the groove depth of the pressure relief groove 30 will not be too large, resulting in too low structural strength of the housing assembly 10 where the pressure relief groove 30 is provided. At the same time, the groove depth of the pressure relief groove 30 will not be too small, so that when the battery cell assembly 20 is abnormally heated and expands to produce gas, the pressure relief groove 30 cannot be broken. In this embodiment, the value of T1 / T3 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85 and 0.9.

[0084] Optionally, along the concave direction of the pressure relief groove 30 , the minimum distance T5 between the groove bottom of the pressure relief groove 30 and the inner wall surface of the housing assembly 10 and the thickness T3 of the housing assembly 10 satisfy the relationship: 0.15≤T5 / T3≤0.5.

[0085] Similarly, when T5 / T3 satisfies the above relationship, the maximum groove depth of the pressure relief groove 30 will not be too small, resulting in the pressure relief groove 30 being unable to release pressure in time, nor will it cause the maximum groove depth of the pressure relief groove 30 to be too large, resulting in the part of the housing assembly 10 provided with the pressure relief groove 30 having low structural strength and being easily damaged by external impact. In this embodiment, the values ​​of T5 / T3 can be 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45 and 0.5.

[0086] It is worth mentioning that the battery in this embodiment may include batteries of various shapes, such as Figure 7 and attached Fig. 9 As shown, the battery can be an L-shaped battery or a rectangular columnar battery. Of course, it can also be a cylindrical battery, a hexagonal prism battery, etc.

[0087] In a specific embodiment, the housing assembly 10 includes a main body section 13 and a raised section 14, the raised section 14 protrudes in a direction away from the main body section 13 and is arranged in an L-shape with the main body section 13, the main body section 13 includes a third side wall 131, the raised section 14 includes a fourth side wall 141, an arc-shaped wall 150 is connected between the third side wall 131 and the fourth side wall 141, the pressure relief groove 30 is located near the arc-shaped wall 150, the third side wall 131 is arranged parallel to the first straight section 31, and the fourth side wall 141 is arranged parallel to the second straight section 33.

[0088] Specifically, the battery in this embodiment is an L-shaped battery. Since the stress at the corner area formed by the third side wall 131, the arc wall 150 and the fourth side wall 141 of the L-shaped battery is relatively large, the pressure relief groove 30 is arranged in the corner area so that when the stress in the corner area of ​​the L-shaped battery is too large, the pressure relief groove 30 can be opened in time to release pressure.

[0089] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0090] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0091] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A housing component (10), wherein a mounting cavity is arranged in the housing component (10), a pressure relief groove (30) is provided on the outer surface of the housing component (10), the pressure relief groove (30) is recessed along the direction from the outer surface of the housing component (10) to the mounting cavity, and a support portion (40) is filled in the pressure relief groove (30); A battery cell assembly (20), wherein the battery cell assembly (20) is arranged in the installation cavity.

2. The battery according to claim 1, characterized in that The supporting portion (40) comprises a hot-melt layer.

3. The battery according to claim 2, characterized in that The hot melt layer includes at least one of the following five types: an epoxy resin layer, a polyacrylic acid layer, a polypropylene layer, a two-liquid mixed hardening adhesive layer, and a shadowless adhesive layer.

4. The battery according to claim 1, characterized in that The housing assembly (10) comprises a cover body (11) and a bottom shell (12); the bottom shell (12) has a groove; the cover body (11) is arranged on the bottom shell (12) and seals the groove to form the installation cavity; the pressure relief groove (30) is arranged on a side of the cover body (11) away from the installation cavity.

5. The battery according to claim 4, characterized in that The ratio of the minimum distance H between the center of a side of the cover body (11) facing away from the installation cavity and the pressure relief groove (30) to the width L of the cover body (11) along the first direction satisfies the relationship: 1 / 2≤H / L≤2 / 3.

6. The battery according to claim 4, characterized in that A fixing portion (50) is connected between the battery cell assembly (20) and the cover body (11), and along the direction from the bottom shell (12) to the cover body (11), the projection surface of the fixing portion (50) and the projection surface of the pressure relief groove (30) do not overlap each other, or A fixing portion (50) is connected between the battery cell assembly (20) and the cover body (11), and along the direction from the bottom shell (12) to the cover body (11), the projection surface of the fixing portion (50) at least partially overlaps with the projection surface of the pressure relief groove (30).

7. The battery according to claim 6, characterized in that The pressure relief groove (30) comprises a first straight section (31), a first arc section (32) and a second straight section (33), wherein the first arc section (32) is connected between the first straight section (31) and the second straight section (33).

8. The battery according to claim 7, characterized in that The cover body (11) comprises a first side wall (111), an arcuate side wall (112) and a second side wall (113); the arcuate side wall (112) is connected between the first side wall (111) and the second side wall (113); the first side wall (111) is arranged parallel to the first straight section (31); and the second side wall (113) is arranged parallel to the second straight section (33).

9. The battery according to claim 8, characterized in that The fixing portion (50) comprises a fixing ring, which is arranged on a side of the battery cell close to the cover body (11), and the fixing ring comprises a third straight section (51), a second arc section (52) and a fourth straight section (53), the second arc section (52) is connected between the third straight section (51) and the fourth straight section (53), the third straight section (51) is arranged parallel to the first straight section (31), and the fourth straight section (53) is arranged parallel to the second straight section (33).

10. The battery according to claim 9, characterized in that Along the concave direction of the pressure relief groove (30), the maximum depth T1 of the groove bottom of the pressure relief groove (30) corresponding to the first straight section (31) and the thickness T4 of the cover body (11) satisfy the relationship: 1 / 4<T1 / T4≤1 / 3; and / or, Along the concave direction of the pressure relief groove (30), the maximum depth T1 of the groove bottom of the pressure relief groove (30) corresponding to the second straight section (33) and the thickness T4 of the cover body (11) satisfy the relationship: 1 / 4<T1 / T4≤1 / 3; and / or, Along the concave direction of the pressure relief groove (30), the maximum depth T1 of the groove bottom of the pressure relief groove (30) corresponding to the first arc segment (32) and the thickness T4 of the cover body (11) satisfy the relationship: 1 / 3<T1 / T4≤2 / 3.

11. The battery according to claim 9, characterized in that The curvature radius r1 of the first arc segment (32), the curvature radius r2 of the arc side wall (112), and the curvature radius r3 of the second arc segment (52) satisfy the relationship: r1:r2:r3=(1.9-2.1):(0.9-1.1):(0.4-0.6); and / or, A minimum distance M1 between the first arc segment (32) and the second arc segment (52) is greater than a minimum distance M2 between the first arc segment (32) and the arc-shaped side wall (112); and / or, A minimum distance M3 between the first straight section (31) and the third straight section (51) is greater than a minimum distance M4 between the first straight section (31) and the first side wall (111); and / or, A minimum distance M5 between the second straight section (33) and the fourth straight section (53) is greater than a minimum distance M6 between the second straight section (33) and the second side wall (113).

12. The battery according to claim 7, characterized in that The housing component (10) comprises a main body section (13) and a raised section (14); the raised section (14) is raised in a direction away from the main body section (13) and is arranged in an L-shape with the main body section (13); the main body section (13) comprises a third side wall (131); the raised section (14) comprises a fourth side wall (141); an arc-shaped wall (150) is connected between the third side wall (131) and the fourth side wall (141); and the pressure relief groove (30) is located at a position close to the arc-shaped wall (150).

13. The battery according to claim 12, characterized in that The third side wall (131) is arranged in parallel with the first straight section (31), and the fourth side wall (141) is arranged in parallel with the second straight section (33).

14. The battery according to any one of claims 1 to 13, characterized in that The pressure relief groove (30) comprises a plurality of first pressure relief sections (301) which are segmented and spaced apart, and at least one of the first pressure relief sections (301) is filled with the support portion (40); or, The pressure relief groove (30) is a second pressure relief section that is continuously arranged, and the support portion (40) is filled in the second pressure relief section.

15. The battery according to any one of claims 1 to 13, characterized in that Along the recessed direction of the pressure relief groove (30), the cross-sectional area of ​​the pressure relief groove (30) gradually decreases, and the support portion (40) is connected to the inner side wall of the pressure relief groove (30).

16. The battery according to any one of claims 1 to 13, characterized in that Along the concave direction of the pressure relief groove (30), the maximum depth T1 of the pressure relief groove (30) and the maximum filling height T2 of the support portion (40) satisfy the relationship: 0<T2≤1.1T1; and / or, The cross-sectional area S1 of the pressure relief groove (30) and the cross-sectional area S2 of the support portion (40) satisfy the relationship: 0.5≤S2 / S1≤1.

1.

17. The battery according to any one of claims 1 to 13, characterized in that The maximum width L1 of the pressure relief groove (30) satisfies the relationship: 0.05 mm ≤ L1 ≤ 0.5 mm; and / or, Along the concave direction of the pressure relief groove (30), the maximum depth T1 of the pressure relief groove (30) and the thickness T3 of the housing component (10) satisfy the relationship: 0.5≤T1 / T3≤0.9; and / or, Along the concave direction of the pressure relief groove (30), the minimum distance T5 between the groove bottom of the pressure relief groove (30) and the inner wall surface of the housing component (10) and the thickness T3 of the housing component (10) satisfy the relationship: 0.15≤T5 / T3≤0.5.

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